/* Билд bin/build-assets.php из assets/css/main.css. Не править: правка — в исходниках и пересборка. */
/* css/main.css */
/* css/base/fonts.css */
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/onest-cyrillic-ext.woff2') format('woff2');
  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/onest-cyrillic.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/onest-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/onest-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/onest-cyrillic-ext.woff2') format('woff2');
  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/onest-cyrillic.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/onest-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/onest-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/onest-cyrillic-ext.woff2') format('woff2');
  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/onest-cyrillic.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/onest-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/onest-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* css/base/vars.css */
:root {
  --white: #FFFFFF;
  --ink: #121316;
  --muted: #5E6068;
  --surface: #F2F3F5;
  --tint: #cbeaff;
  --mint: #D6E4DD;
  --mint-dark: #4E7F6E;
  --primary: #1A71D2;
  --primary-dark: color-mix(in srgb, var(--primary) 82%, black);
  --hot: #f6f8bc;
  --signal: #E46A33;
  --lime: #c8ffa8;
  --dark: #16171B;
  --on-dark-muted: rgba(255, 255, 255, 0.66);
  --border: rgba(18, 19, 22, 0.1);
  --sky: #CFEEFF;
  --chapter-done-bg: #c1d0de;
  --chapter-done-color: var(--white);
  --avatar-bg: #D1ECFF;
  --success: #7ab13c;
  --success-bg: #dcf8bc;
  --error: #fa5151;
  --error-bg: #ffdfdf;
  --danger: color-mix(in srgb, var(--error) 78%, black);
  --success-text: color-mix(in srgb, var(--success) 55%, black);
  --error-text: color-mix(in srgb, var(--error) 65%, black);
  --placeholder: #74767E;
  --radius-xl: 40px;
  --radius-lg: 28px;
  --radius: 20px;
  --radius-sm: 12px;
  --font-body: 'Onest', sans-serif;
  --font-mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --container: 1180px;
  --gutter: 20px;
  --section-gap: 104px;
  --shadow: 0 18px 40px rgba(18, 19, 22, 0.12);
  --transition: 0.2s ease;
  --header-height: 68px;
  --aside-width: 340px;
  --aside-gap: 56px;
  --reading: 760px;
}
@media (max-width: 768px) {
  :root {
    --radius-xl: 28px;
    --radius-lg: 22px;
    --radius: 18px;
    --gutter: 16px;
    --section-gap: 72px;
    --header-height: 60px;
  }
}
/* css/base/reset.css */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
/* css/base/base.css */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}
body {
  font-family: var(--font-body);
  background: var(--white);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
h1,
h2,
h3 {
  font-weight: 500;
}
img,
svg {
  display: block;
  max-width: 100%;
}
img {
  height: auto;
}
ul,
ol {
  list-style: none;
}
a {
  color: inherit;
}
button {
  font: inherit;
  color: inherit;
}
:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}
/* css/blocks/container.css */
.container {
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
/* css/blocks/icon.css */
.icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.icon--sm {
  width: 16px;
  height: 16px;
}
.icon--lg {
  width: 28px;
  height: 28px;
}
/* css/blocks/btn.css */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 28px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.25;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
}
.btn:active {
  transform: translateY(1px);
}
.btn--primary {
  background: var(--ink);
  color: var(--white);
}
.btn--primary:hover {
  background: var(--primary);
}
.btn--outline {
  border-color: rgba(18, 19, 22, 0.28);
  background: none;
  color: var(--ink);
}
.btn--outline:hover {
  border-color: var(--ink);
}
.btn--dark {
  background: var(--ink);
  color: var(--white);
}
.btn--dark:hover {
  background: var(--primary);
}
.btn--danger {
  background: var(--danger);
  color: var(--white);
}
.btn--danger:hover {
  background: color-mix(in srgb, var(--danger) 85%, black);
}
.btn--sm {
  padding: 10px 18px;
  font-size: 14px;
}
.btn--wide {
  width: 100%;
}
.btn:disabled {
  background: var(--surface);
  border-color: transparent;
  color: var(--muted);
  cursor: not-allowed;
  transform: none;
}
/* css/blocks/chip.css */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 99px;
  background: var(--white);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.3;
}
.chip--surface {
  background: var(--surface);
}
.chip--dark {
  background: var(--ink);
  color: var(--white);
}
.chip--lg {
  padding: 12px 20px;
  font-size: 16px;
}
/* css/blocks/avatar.css */
.avatar {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--avatar-bg);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  object-fit: cover;
  user-select: none;
}
.avatar--photo {
  outline: 1px solid var(--border);
  outline-offset: -1px;
}
/* css/blocks/app-header.css */
.app-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
}
.app-header__inner {
  display: flex;
  align-items: center;
  gap: 32px;
  min-height: var(--header-height);
}
.app-header__logo {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.app-header__nav {
  display: flex;
  gap: 24px;
  margin-right: auto;
  translate: 0 1.5px;
}
.app-header__inner > .user-menu,
.app-header__inner > .btn {
  margin-left: auto;
}
.app-header__link {
  font-size: 15px;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--transition);
}
.app-header__link:hover {
  color: var(--ink);
}
.app-header__link--active {
  font-weight: 500;
  color: var(--ink);
}
.app-header__count {
  display: inline-grid;
  place-items: center;
  min-width: 20px;
  height: 20px;
  margin-left: 6px;
  padding: 0 6px;
  border-radius: 99px;
  background: var(--primary);
  font-size: 12px;
  font-weight: 600;
  color: var(--white);
  vertical-align: 1px;
}
.app-header--wide .app-header__inner {
  max-width: none;
}
@media (max-width: 768px) {
  .app-header__inner {
    gap: 16px;
  }
  .app-header:not(.app-header--admin) .badge--link ~ .app-header__nav {
    display: none;
  }
  .app-header__nav--wide {
    display: none;
  }
  :root:has(.app-header--admin) {
    --header-height: 100px;
  }
  .app-header--admin .app-header__inner {
    flex-wrap: wrap;
    row-gap: 9px;
    min-height: 0;
    padding-top: 9px;
  }
  .app-header--admin .app-header__nav {
    order: 1;
    flex: none;
    align-items: center;
    width: calc(100% + var(--gutter) * 2);
    height: 40px;
    margin: 0 calc(var(--gutter) * -1);
    padding: 0 var(--gutter);
    overflow-x: auto;
    scrollbar-width: none;
    translate: none;
  }
  .app-header--admin .app-header__link {
    flex-shrink: 0;
    white-space: nowrap;
  }
  .app-header--admin .user-menu {
    margin-left: auto;
  }
}
/* css/blocks/user-menu.css */
.user-menu {
  position: relative;
}
.user-menu__trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 12px 4px 4px;
  border: 1px solid var(--border);
  border-radius: 99px;
  background: var(--white);
  cursor: pointer;
  transition: border-color var(--transition);
}
.user-menu__trigger:hover {
  border-color: rgba(18, 19, 22, 0.28);
}
.user-menu__avatar {
  width: 32px;
  height: 32px;
  font-size: 13px;
}
.user-menu__name {
  font-size: 15px;
  font-weight: 500;
}
.user-menu__chevron {
  transition: transform var(--transition);
}
.user-menu__trigger[aria-expanded='true'] .user-menu__chevron {
  transform: rotate(180deg);
}
.user-menu__dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 240px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--white);
  box-shadow: var(--shadow);
}
.user-menu__email {
  margin-bottom: 6px;
  padding: 8px 12px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  color: var(--muted);
}
.user-menu__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 15px;
  text-decoration: none;
  transition: background var(--transition);
}
.user-menu__link:hover {
  background: var(--surface);
}
.user-menu__group {
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid var(--border);
}
.user-menu__link[aria-current='page'] {
  font-weight: 500;
}
@media (max-width: 768px) {
  .user-menu__name {
    display: none;
  }
}
.user-menu__link--button {
  width: 100%;
  border: 0;
  background: none;
  text-align: left;
  cursor: pointer;
}
/* css/blocks/back-link.css */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--transition);
}
.back-link:hover {
  color: var(--ink);
}
/* css/blocks/progress.css */
.progress__track {
  height: 8px;
  border-radius: 99px;
  background: var(--surface);
  overflow: hidden;
}
.progress__fill {
  display: block;
  width: var(--value, 0%);
  height: 100%;
  border-radius: inherit;
  background: var(--primary);
  transition: width 0.4s ease;
}
.progress__label {
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}
.progress--on-tint .progress__track {
  background: rgba(255, 255, 255, 0.75);
}
.progress--on-tint .progress__label {
  color: var(--ink);
}
.progress--thin .progress__track {
  height: 4px;
}
.progress--on-surface .progress__track {
  background: var(--white);
}
/* css/blocks/course-card.css */
.course-card {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.course-card__cover {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 32px;
  min-height: 320px;
  padding: 32px;
  background: var(--tint);
}
.course-card__cover--lime {
  background: var(--lime);
}
.course-card__cover--photo {
  --cover-tone: var(--dark);
  position: relative;
  isolation: isolate;
  background: var(--dark);
  color: var(--white);
}
.course-card__photo {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.course-card__cover--photo::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(to bottom, color-mix(in srgb, var(--cover-tone) 88%, transparent) 0%, color-mix(in srgb, var(--cover-tone) 55%, transparent) 30%, transparent 58%),
    linear-gradient(to top, color-mix(in srgb, var(--cover-tone) 50%, transparent) 0%, transparent 30%);
}
.course-card__cover--photo .chip {
  color: var(--ink);
}
.course-card__cover-title {
  max-width: 320px;
  font-size: 40px;
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -0.04em;
}
.course-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.course-card__body {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 32px;
}
.course-card__meta {
  font-size: 14px;
  color: var(--muted);
}
.course-card__title {
  margin-top: -12px;
  font-size: 28px;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.course-card__link {
  text-decoration: none;
}
.course-card__link:hover {
  color: var(--primary);
}
.course-card__next {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  background: var(--surface);
}
.course-card__next-label {
  font-size: 14px;
  color: var(--muted);
}
.course-card__next-title {
  font-weight: 500;
}
.course-card__next-chapter {
  font-size: 14px;
  color: var(--muted);
}
.course-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: auto;
}
@media (max-width: 768px) {
  .course-card {
    grid-template-columns: 1fr;
  }
  .course-card__cover {
    min-height: 0;
    padding: 24px;
  }
  .course-card__cover--photo {
    min-height: 240px;
  }
  .course-card__cover-title {
    font-size: 30px;
  }
  .course-card__body {
    padding: 24px;
  }
  .course-card__title {
    font-size: 24px;
  }
}
/* css/blocks/course-list.css */
.course-list {
  display: grid;
  gap: 24px;
}
/* css/blocks/chapter-list.css */
.chapter-list {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
}
.chapter-list__item {
  border-bottom: 1px solid var(--border);
  scroll-margin-top: calc(var(--header-height) + 16px);
}
.chapter-list__item:last-child {
  border-bottom: none;
}
.chapter-list__head {
  display: flex;
  align-items: center;
  gap: 20px;
  width: 100%;
  padding: 22px 24px;
  border: none;
  background: none;
  text-align: left;
}
button.chapter-list__head {
  cursor: pointer;
}
.chapter-list__number {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 18px;
  font-weight: 600;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.chapter-list__item--done .chapter-list__number {
  background: var(--chapter-done-bg);
  color: var(--chapter-done-color);
}
.chapter-list__item--current .chapter-list__number {
  background: var(--ink);
  color: var(--white);
}
.chapter-list__item--soon .chapter-list__number {
  background: none;
  box-shadow: inset 0 0 0 1px var(--border);
}
.chapter-list__text {
  display: grid;
  gap: 4px;
  min-width: 0;
  margin-right: auto;
}
.chapter-list__title {
  font-size: 21px;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.015em;
}
.chapter-list__item--soon .chapter-list__title {
  color: var(--muted);
}
.chapter-list__meta {
  font-size: 15px;
  color: var(--muted);
}
.chapter-list__progress {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.chapter-list__scale {
  display: block;
  width: 112px;
}
.chapter-list__scale .progress__track {
  display: block;
}
.chapter-list__count {
  min-width: 48px;
  font-size: 14px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  text-align: right;
}
.chapter-list__icon {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface);
  transition: transform var(--transition), background var(--transition);
}
.chapter-list__head:hover .chapter-list__icon {
  background: var(--tint);
}
.chapter-list__head[aria-expanded='true'] .chapter-list__icon {
  transform: rotate(180deg);
}
.chapter-list__body {
  padding: 0 8px 20px 92px;
}
.chapter-list--compact {
  display: grid;
  gap: 2px;
  border: none;
  border-radius: 0;
  background: none;
}
.chapter-list--compact .chapter-list__item {
  border-bottom: none;
}
.chapter-list--compact .chapter-list__head {
  gap: 12px;
  padding: 10px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.chapter-list--compact button.chapter-list__head:hover {
  background: var(--white);
}
.chapter-list--compact .chapter-list__number {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  font-size: 13px;
}
.chapter-list--compact .chapter-list__item--locked .chapter-list__number {
  background: var(--white);
}
.chapter-list--compact .chapter-list__text {
  gap: 0;
}
.chapter-list--compact .chapter-list__title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0;
}
.chapter-list--compact .chapter-list__meta {
  font-size: 13px;
}
.chapter-list--compact .chapter-list__icon {
  width: 24px;
  height: 24px;
  background: none;
}
.chapter-list--compact .chapter-list__head:hover .chapter-list__icon {
  background: none;
}
.chapter-list--compact .chapter-list__body {
  margin: 0 0 8px 23px;
  padding: 2px 0 0 8px;
  border-left: 1px solid var(--border);
}
@media (max-width: 768px) {
  .chapter-list__head {
    gap: 14px;
    padding: 18px 16px;
  }
  .chapter-list__number {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }
  .chapter-list__title {
    font-size: 18px;
  }
  .chapter-list__meta {
    font-size: 14px;
  }
  .chapter-list__scale {
    display: none;
  }
  .chapter-list__count {
    min-width: 0;
  }
  .chapter-list__body {
    padding: 0 4px 16px;
  }
}
/* css/blocks/lesson-list.css */
.lesson-list {
  display: grid;
  gap: 4px;
}
.lesson-list__link {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background var(--transition);
}
a.lesson-list__link:hover {
  background: var(--surface);
}
.lesson-list__status {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface);
  color: var(--muted);
}
.lesson-list__item--done .lesson-list__status {
  background: var(--success-bg);
  color: var(--success);
}
.lesson-list__item--current .lesson-list__status {
  background: var(--ink);
  color: var(--white);
}
.lesson-list__body {
  display: grid;
  gap: 2px;
  min-width: 0;
  margin-right: auto;
}
.lesson-list__title {
  font-size: 17px;
  font-weight: 500;
  line-height: 1.3;
}
.lesson-list__item--locked .lesson-list__title {
  color: var(--muted);
}
.lesson-list__meta {
  font-size: 14px;
  color: var(--muted);
}
.lesson-list__type {
  display: inline-block;
  margin-right: 4px;
  vertical-align: -3px;
}
.lesson-list__state {
  flex-shrink: 0;
  font-size: 14px;
  color: var(--muted);
}
.lesson-list__item--current .lesson-list__link {
  background: var(--sky);
}
.lesson-list__item--current .lesson-list__state {
  font-weight: 500;
  color: var(--ink);
}
.lesson-list--standalone {
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
}
.lesson-list--compact {
  gap: 2px;
}
.lesson-list--compact .lesson-list__link {
  gap: 12px;
  padding: 10px;
}
.lesson-list--compact a.lesson-list__link:hover {
  background: var(--white);
}
.lesson-list--compact .lesson-list__status {
  width: 28px;
  height: 28px;
}
.lesson-list--compact .lesson-list__status .icon {
  width: 14px;
  height: 14px;
}
.lesson-list--compact .lesson-list__item--done .lesson-list__status {
  background: var(--white);
}
.lesson-list--compact .lesson-list__title {
  font-size: 14px;
}
.lesson-list--compact .lesson-list__meta {
  font-size: 13px;
}
.lesson-list__item--revise .lesson-list__status,
.lesson-list--compact .lesson-list__item--revise .lesson-list__status {
  background: var(--hot);
  color: var(--ink);
}
.lesson-list__link[aria-current='page'] {
  background: var(--white);
}
@media (max-width: 768px) {
  .lesson-list__link {
    gap: 12px;
    padding: 12px;
  }
  .lesson-list__title {
    font-size: 16px;
  }
  .lesson-list__state {
    display: none;
  }
}
/* css/blocks/breadcrumbs.css */
.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
  font-size: 15px;
  color: var(--muted);
}
.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.breadcrumbs__item + .breadcrumbs__item::before {
  content: '';
  width: 6px;
  height: 6px;
  border-top: 1.5px solid currentColor;
  border-right: 1.5px solid currentColor;
  transform: rotate(45deg);
}
.breadcrumbs__link {
  text-decoration: none;
  transition: color var(--transition);
}
.breadcrumbs__link:hover {
  color: var(--ink);
}
/* css/blocks/lesson-head.css */
.lesson-head__crumbs {
  margin-bottom: 14px;
}
.lesson-head__title {
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.1;
  letter-spacing: -0.03em;
}
.lesson-head__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.lesson-head__desc {
  max-width: 640px;
  margin-top: 16px;
  font-size: 18px;
  color: var(--muted);
}
@media (max-width: 768px) {
  .lesson-head__desc {
    font-size: 16px;
  }
}
/* css/blocks/lesson-section.css */
.lesson-section {
  margin-top: 32px;
}
.lesson-section__title {
  margin-bottom: 16px;
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.lesson-section__body {
  display: grid;
  gap: 24px;
}
@media (max-width: 768px) {
  .lesson-section {
    margin-top: 36px;
  }
  .lesson-section__title {
    font-size: 21px;
  }
}
/* css/blocks/lesson-footer.css */
.lesson-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.lesson-footer__prev {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  text-decoration: none;
}
.lesson-footer__prev-icon {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--surface);
  transition: background var(--transition);
}
.lesson-footer__prev:hover .lesson-footer__prev-icon {
  background: var(--tint);
}
.lesson-footer__prev-text {
  display: grid;
  min-width: 0;
}
.lesson-footer__label {
  font-size: 14px;
  color: var(--muted);
}
.lesson-footer__name {
  overflow: hidden;
  font-weight: 500;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.lesson-footer__next {
  display: grid;
  justify-items: end;
  gap: 8px;
  margin-left: auto;
  text-align: right;
}
.lesson-footer__action {
  display: grid;
  justify-items: inherit;
  gap: 8px;
}
.lesson-footer__hint {
  font-size: 12px;
  color: var(--muted);
}
.lesson-footer__lock {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 15px;
  color: var(--muted);
}
@media (max-width: 768px) {
  .lesson-footer {
    flex-direction: column-reverse;
    align-items: stretch;
  }
  .lesson-footer__next {
    justify-items: stretch;
    margin-left: 0;
    text-align: left;
  }
}
/* css/blocks/otp.css */
.otp {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  min-width: 0;
  border: 0;
}
.otp__input {
  width: 100%;
  height: 64px;
  border: 1px solid rgba(18, 19, 22, 0.2);
  border-radius: var(--radius-sm);
  background: var(--white);
  font: inherit;
  font-size: 26px;
  font-weight: 500;
  text-align: center;
  font-variant-numeric: tabular-nums;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.otp__input:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 22%, transparent);
}
.otp--error .otp__input {
  border-color: var(--error);
  background: var(--error-bg);
}
@media (max-width: 480px) {
  .otp {
    gap: 6px;
  }
  .otp__input {
    height: 54px;
    font-size: 22px;
  }
}
/* css/blocks/profile-card.css */
.profile-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px;
  border-radius: var(--radius);
  background: var(--surface);
}
.profile-card__avatar {
  width: 72px;
  height: 72px;
  font-size: 24px;
}
.profile-card__info {
  display: grid;
  gap: 4px;
  min-width: 0;
}
.profile-card__name {
  font-size: 22px;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.015em;
}
.profile-card__meta {
  overflow: hidden;
  font-size: 15px;
  color: var(--muted);
  white-space: nowrap;
  text-overflow: ellipsis;
}
@media (max-width: 768px) {
  .profile-card {
    gap: 16px;
    padding: 18px;
  }
  .profile-card__avatar {
    width: 56px;
    height: 56px;
    font-size: 19px;
  }
  .profile-card__name {
    font-size: 19px;
  }
}
/* css/blocks/search.css */
.search {
  position: relative;
  flex: 1;
  min-width: 0;
  max-width: 540px;
  margin: 0 auto;
}
.search__icon {
  position: absolute;
  top: 50%;
  left: 14px;
  color: var(--muted);
  transform: translateY(-50%);
  pointer-events: none;
}
.search__input {
  display: block;
  width: 100%;
  min-height: 44px;
  padding: 10px 16px 10px 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font: inherit;
  font-size: 15px;
  color: var(--ink);
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
}
.search__input::placeholder {
  color: var(--placeholder);
}
.search__input:hover {
  border-color: rgba(18, 19, 22, 0.28);
}
.search__input:focus-visible {
  outline: none;
  border-color: var(--primary);
  background: var(--white);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 22%, transparent);
}
@media (max-width: 768px) {
  .search__input {
    min-height: 40px;
    padding-left: 40px;
  }
  .search__icon {
    left: 12px;
  }
}
/* css/blocks/filter-chip.css */
.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid rgba(18, 19, 22, 0.16);
  border-radius: 99px;
  background: var(--white);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.3;
  white-space: nowrap;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}
.filter-chip:hover {
  border-color: var(--ink);
}
.filter-chip[aria-pressed='true'],
.filter-chip--selected {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--white);
}
.filter-chip__chevron {
  transition: transform var(--transition);
}
.filter-chip[aria-expanded='true'] .filter-chip__chevron {
  transform: rotate(180deg);
}
.filter-chip__count {
  display: grid;
  place-items: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  border-radius: 99px;
  background: var(--white);
  font-size: 13px;
  color: var(--ink);
}
.filter-chip--active {
  gap: 0;
  padding: 0;
  border-color: var(--ink);
  background: var(--ink);
  color: var(--white);
  cursor: default;
}
.filter-chip__label {
  padding: 10px 14px 10px 18px;
}
.filter-chip__remove {
  display: grid;
  place-items: center;
  align-self: stretch;
  padding: 0 14px;
  border: 0;
  border-left: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 0 99px 99px 0;
  background: none;
  color: var(--white);
  cursor: pointer;
  transition: background var(--transition);
}
.filter-chip__remove:hover {
  background: rgba(255, 255, 255, 0.14);
}
.filter-chip--reset {
  border-color: transparent;
  background: none;
  color: var(--muted);
}
.filter-chip--reset:hover {
  border-color: transparent;
  color: var(--ink);
}
@media (max-width: 768px) {
  .filter-chip {
    min-height: 40px;
    padding: 8px 14px;
    font-size: 14px;
  }
  .filter-chip--active {
    padding: 0;
  }
  .filter-chip__label {
    padding: 8px 12px 8px 14px;
  }
}
/* css/blocks/filter-menu.css */
.filter-menu {
  position: relative;
}
.filter-menu__dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  z-index: 20;
  min-width: 240px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--white);
  box-shadow: var(--shadow);
}
.filter-menu__options {
  display: grid;
  gap: 2px;
}
/* css/blocks/catalog-card.css */
.catalog-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-rows: auto 1fr auto;
  gap: 12px 16px;
  height: 100%;
  min-height: 300px;
  padding: 24px;
  border-radius: var(--radius);
  background: var(--surface);
  transition: background var(--transition);
}
.catalog-card--preview {
  height: auto;
}
.catalog-card--tint {
  background: var(--tint);
}
.catalog-card--lime {
  background: var(--lime);
}
.catalog-card--mint {
  background: var(--mint);
}
.catalog-card--hot {
  background: var(--hot);
}
.catalog-card--dark {
  background: var(--dark);
  color: var(--white);
}
.catalog-card:hover {
  background: color-mix(in srgb, var(--surface) 92%, var(--ink));
}
.catalog-card--tint:hover {
  background: color-mix(in srgb, var(--tint) 92%, var(--ink));
}
.catalog-card--lime:hover {
  background: color-mix(in srgb, var(--lime) 92%, var(--ink));
}
.catalog-card--mint:hover {
  background: color-mix(in srgb, var(--mint) 92%, var(--ink));
}
.catalog-card--hot:hover {
  background: color-mix(in srgb, var(--hot) 92%, var(--ink));
}
.catalog-card--dark:hover {
  background: color-mix(in srgb, var(--dark) 88%, var(--white));
}
.catalog-card__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  align-self: start;
  font-size: 14px;
  font-weight: 500;
}
.catalog-card__mark {
  display: grid;
  place-items: center;
  width: 104px;
  height: 104px;
  border-radius: 24px;
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--white);
  letter-spacing: -0.02em;
}
.catalog-card--dark .catalog-card__mark {
  background: var(--lime);
  color: var(--ink);
}
.catalog-card__title {
  grid-column: 1 / -1;
  align-self: end;
  font-size: 24px;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.catalog-card__link {
  text-decoration: none;
}
.catalog-card__link::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
}
.catalog-card__link:focus-visible {
  outline: none;
}
.catalog-card__link:focus-visible::after {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
}
.catalog-card__meta {
  grid-column: 1 / -1;
  font-size: 14px;
  color: var(--muted);
}
.catalog-card--dark .catalog-card__meta {
  color: var(--on-dark-muted);
}
.catalog-card__price {
  font-weight: 500;
  color: var(--ink);
}
.catalog-card__cover {
  --size: 132px;
  width: var(--size);
  height: var(--size);
  border-radius: 24px;
  object-fit: cover;
}
.catalog-card--photo {
  --cover-tone: var(--dark);
  isolation: isolate;
  background: var(--dark);
  color: var(--white);
}
.catalog-card--photo:hover {
  background: var(--dark);
}
.catalog-card__photo {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  object-fit: cover;
  transition: filter var(--transition);
}
.catalog-card--photo::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  background: linear-gradient(to top, color-mix(in srgb, var(--cover-tone) 92%, transparent) 0%, color-mix(in srgb, var(--cover-tone) 68%, transparent) 32%, transparent 64%),
    linear-gradient(to bottom, color-mix(in srgb, var(--cover-tone) 45%, transparent) 0%, transparent 26%);
}
.catalog-card--photo:hover .catalog-card__photo {
  filter: brightness(1.12);
}
.catalog-card--photo .catalog-card__meta {
  color: var(--on-dark-muted);
}
.catalog-card--photo .catalog-card__price {
  color: var(--white);
}
@media (max-width: 768px) {
  .catalog-card {
    min-height: 240px;
    padding: 20px;
  }
  .catalog-card__mark {
    width: 80px;
    height: 80px;
    border-radius: 18px;
    font-size: 18px;
  }
  .catalog-card__cover {
    width: 80px;
    height: 80px;
    border-radius: 18px;
  }
  .catalog-card__title {
    font-size: 22px;
  }
}
/* css/blocks/empty-state.css */
.empty-state {
  display: grid;
  justify-items: start;
  gap: 16px;
  padding: 40px;
  border-radius: var(--radius);
  background: var(--surface);
}
.empty-state__title {
  font-size: 22px;
  letter-spacing: -0.02em;
}
.empty-state__text {
  max-width: 560px;
  margin-top: -8px;
  color: var(--muted);
}
.empty-state--compact {
  padding: 20px 24px;
}
@media (max-width: 768px) {
  .empty-state {
    padding: 24px;
  }
}
/* css/blocks/request-list.css */
.request-list {
  border-top: 1px solid var(--border);
}
.request-list__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 24px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--border);
}
.request-list__course {
  font-size: 17px;
  font-weight: 500;
}
.request-list__status {
  font-size: 15px;
  color: var(--muted);
}
/* css/blocks/badge.css */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  padding: 4px 10px;
  border-radius: 99px;
  background: var(--surface);
  font-size: 13px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--muted);
  white-space: nowrap;
}
.badge--published {
  background: var(--success-bg);
  color: var(--ink);
}
.badge--published::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
}
.badge--draft {
  background: var(--hot);
  color: var(--ink);
}
.badge--draft::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal);
}
.badge--accepted {
  background: var(--success-bg);
  color: var(--ink);
}
.badge--revise {
  background: var(--hot);
  color: var(--ink);
}
.badge--late {
  background: var(--error-bg);
  color: var(--ink);
}
.badge--late::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--error);
}
.badge--dark {
  background: var(--ink);
  color: var(--white);
}
.badge--link {
  text-decoration: none;
  transition: background var(--transition);
}
.badge--dark.badge--link:hover {
  background: var(--primary);
}
/* css/blocks/icon-btn.css */
.icon-btn {
  display: inline-grid;
  place-items: center;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  padding: 0;
  border: none;
  border-radius: 10px;
  background: none;
  color: var(--muted);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.icon-btn:hover {
  background: var(--surface);
  color: var(--ink);
}
.icon-btn--danger:hover {
  background: var(--error-bg);
  color: var(--danger);
}
.icon-btn--handle {
  width: 28px;
  color: var(--placeholder);
  cursor: grab;
  touch-action: none;
}
.icon-btn--handle:active {
  cursor: grabbing;
}
/* css/blocks/modal.css */
.modal {
  width: min(480px, calc(100% - var(--gutter) * 2));
  margin: auto;
  padding: 28px;
  border: none;
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
  box-shadow: var(--shadow);
}
.modal::backdrop {
  background: rgba(18, 19, 22, 0.4);
}
.modal__title {
  font-size: 22px;
  line-height: 1.25;
  letter-spacing: -0.015em;
}
.modal__text {
  margin-top: 8px;
  color: var(--muted);
}
.modal__body {
  margin-top: 20px;
}
.modal__fields {
  display: grid;
  gap: 20px;
}
.modal__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.modal__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 24px;
}
@media (max-width: 768px) {
  .modal {
    padding: 22px;
  }
  .modal__actions .btn {
    flex: 1;
  }
  .modal__row {
    grid-template-columns: 1fr;
  }
}
/* css/blocks/course-rows.css */
.course-rows {
  border-top: 1px solid var(--border);
}
.course-rows__item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.course-rows__item:hover {
  background: var(--surface);
}
.course-rows__cover {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: var(--tint);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  object-fit: cover;
}
.course-rows__cover--draft {
  background: var(--white);
  box-shadow: inset 0 0 0 1px var(--border);
  color: var(--muted);
}
.course-rows__body {
  display: grid;
  gap: 2px;
  min-width: 0;
  margin-right: auto;
}
.course-rows__title {
  font-size: 19px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.course-rows__link {
  text-decoration: none;
}
.course-rows__link::after {
  content: '';
  position: absolute;
  inset: 0;
}
.course-rows__link:hover {
  color: var(--primary);
}
.course-rows__meta {
  font-size: 14px;
  color: var(--muted);
}
.course-rows__students {
  flex-shrink: 0;
  min-width: 120px;
  font-size: 15px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.course-rows__value {
  font-weight: 500;
  color: var(--ink);
}
.course-rows__actions {
  position: relative;
  display: flex;
  gap: 4px;
}
@media (max-width: 768px) {
  .course-rows__item {
    flex-wrap: wrap;
    gap: 12px 16px;
  }
  .course-rows__cover {
    width: 44px;
    height: 44px;
    font-size: 15px;
  }
  .course-rows__body {
    flex: 1 1 calc(100% - 112px);
    margin-right: 0;
  }
  .course-rows__students {
    min-width: 0;
    margin-right: auto;
  }
}
/* css/blocks/sort-row.css */
.sort-row--dragging {
  opacity: 0.4;
}
.sort-row__handle {
  position: relative;
  flex-shrink: 0;
  margin-right: -8px;
}
/* css/blocks/direction-rows.css */
.direction-rows {
  max-width: 760px;
  border-top: 1px solid var(--border);
}
.direction-rows__item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--border);
  background: var(--white);
}
.direction-rows__body {
  flex: 1;
  min-width: 0;
}
.direction-rows__name {
  font-size: 17px;
  font-weight: 500;
}
.direction-rows__edit {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 8px;
}
.direction-rows__item:has(.direction-rows__edit:not([hidden])) {
  flex-wrap: wrap;
}
.direction-rows__item:has(.direction-rows__edit:not([hidden])) .direction-rows__body {
  flex-basis: calc(100% - 48px);
}
.direction-rows__item:has(.direction-rows__edit:not([hidden])) .direction-rows__actions {
  display: none;
}
.direction-rows__edit .field {
  flex: 1 1 220px;
}
.direction-rows__count {
  flex-shrink: 0;
  min-width: 90px;
  font-size: 15px;
  color: var(--muted);
}
.direction-rows__actions {
  display: flex;
  gap: 4px;
}
.direction-add {
  max-width: 760px;
  margin-top: 28px;
}
.direction-add__row {
  display: flex;
  gap: 8px;
}
.direction-add__row .field__input {
  flex: 1;
  min-width: 0;
}
@media (max-width: 768px) {
  .direction-rows__item {
    flex-wrap: wrap;
    gap: 8px 12px;
  }
  .direction-rows__count {
    min-width: 0;
  }
}
/* css/blocks/people-rows.css */
.people-rows {
  border-top: 1px solid var(--border);
}
.people-rows__item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--border);
}
.people-rows__avatar {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--avatar-bg);
  object-fit: cover;
  font-size: 14px;
  font-weight: 600;
}
.people-rows__body {
  display: grid;
  gap: 2px;
  min-width: 0;
  margin-right: auto;
}
.people-rows__title {
  font-size: 17px;
  font-weight: 500;
  line-height: 1.35;
}
.people-rows__link {
  text-decoration: none;
}
.people-rows__link:hover {
  color: var(--primary);
}
.people-rows__meta {
  font-size: 14px;
  color: var(--muted);
  overflow-wrap: anywhere;
}
.people-rows__note {
  margin-top: 6px;
  font-size: 15px;
}
.people-rows__actions {
  display: flex;
  flex-shrink: 0;
  flex-wrap: wrap;
  gap: 8px;
}
@media (max-width: 768px) {
  .people-rows__item {
    flex-wrap: wrap;
    align-items: flex-start;
  }
  .people-rows__body {
    flex: 1 1 calc(100% - 56px);
    margin-right: 0;
  }
  .people-rows__actions {
    margin-left: 56px;
  }
}
/* css/blocks/program.css */
.program {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
.program__chapter {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
  transition: opacity var(--transition), box-shadow var(--transition);
}
.program__chapter--dragging {
  opacity: 0.5;
  box-shadow: inset 0 0 0 2px var(--primary);
}
.program__head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 12px 12px 8px;
}
.program__heading {
  flex: 1;
  min-width: 0;
}
.program__toggle {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 6px 8px;
  border: none;
  border-radius: var(--radius-sm);
  background: none;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition);
}
.program__toggle:hover {
  background: var(--surface);
}
.program__number {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 16px;
  font-weight: 600;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.program__text {
  display: grid;
  gap: 2px;
  min-width: 0;
  margin-right: auto;
}
.program__title {
  font-size: 19px;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.program__meta {
  font-size: 14px;
  color: var(--muted);
}
.program__chevron {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  color: var(--muted);
  transition: transform var(--transition);
}
.program__toggle[aria-expanded='true'] .program__chevron {
  transform: rotate(180deg);
}
.program__actions {
  display: flex;
  gap: 2px;
  flex-shrink: 0;
}
.program__body {
  padding: 0 12px 12px;
}
@media (max-width: 768px) {
  .program__head {
    flex-wrap: wrap;
    padding: 10px 8px;
  }
  .program__heading {
    flex-basis: calc(100% - 36px);
  }
  .program__toggle {
    gap: 12px;
    padding: 4px;
  }
  .program__number {
    width: 32px;
    height: 32px;
    font-size: 14px;
  }
  .program__title {
    font-size: 17px;
  }
  .program__actions {
    width: 100%;
    justify-content: flex-end;
  }
  .program__body {
    padding: 0 8px 8px;
  }
}
/* css/blocks/lesson-rows.css */
.lesson-rows {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  min-height: 56px;
}
.lesson-rows__item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 8px 8px 4px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), opacity var(--transition);
}
.lesson-rows__item:hover {
  background: var(--surface);
}
.lesson-rows__item--dragging {
  opacity: 0.6;
  background: var(--sky);
}
.lesson-rows--flat {
  gap: 0;
  border-top: 1px solid var(--border);
}
.lesson-rows--flat .lesson-rows__item {
  padding-top: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
}
.lesson-rows__type {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface);
  color: var(--muted);
}
.lesson-rows__item:hover .lesson-rows__type {
  background: var(--white);
}
.lesson-rows__body {
  display: grid;
  gap: 2px;
  min-width: 0;
  margin-right: auto;
}
.lesson-rows__title {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.35;
  text-decoration: none;
}
.lesson-rows__title:hover {
  color: var(--primary);
}
.lesson-rows__number {
  margin-right: 6px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.lesson-rows__meta {
  font-size: 14px;
  color: var(--muted);
}
.lesson-rows__item--draft .lesson-rows__title {
  color: var(--muted);
}
.lesson-rows__item--draft .lesson-rows__title:hover {
  color: var(--primary);
}
.lesson-rows__actions {
  display: flex;
  gap: 2px;
  flex-shrink: 0;
}
.lesson-rows__empty {
  display: grid;
  place-items: center;
  padding: 16px;
  border: 1px dashed rgba(18, 19, 22, 0.2);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--muted);
  text-align: center;
}
.lesson-rows:has(.lesson-rows__item) .lesson-rows__empty {
  display: none;
}
@media (max-width: 768px) {
  .lesson-rows__item {
    gap: 8px;
    padding-right: 4px;
  }
  .lesson-rows__type {
    display: none;
  }
  .lesson-rows__title {
    font-size: 15px;
  }
  .lesson-rows__meta {
    font-size: 13px;
  }
}
/* css/blocks/lesson-type.css */
.lesson-type {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 12px;
}
.lesson-type__option {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-content: start;
  gap: 6px 16px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
}
.lesson-type__option:hover {
  border-color: rgba(18, 19, 22, 0.32);
}
.lesson-type__option:has(.lesson-type__input:checked) {
  border-color: var(--ink);
  background: var(--sky);
  box-shadow: inset 0 0 0 1px var(--ink);
}
.lesson-type__option:has(.lesson-type__input:focus-visible) {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
}
.lesson-type__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.lesson-type__icon {
  display: grid;
  place-items: center;
  grid-row: span 3;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  transition: background var(--transition);
}
.lesson-type__option:has(.lesson-type__input:checked) .lesson-type__icon {
  background: var(--white);
}
.lesson-type__name {
  font-size: 18px;
  font-weight: 500;
  line-height: 1.3;
}
.lesson-type__desc {
  font-size: 15px;
  line-height: 1.45;
  color: var(--muted);
}
.lesson-type__rule {
  margin-top: 6px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  line-height: 1.4;
}
@media (max-width: 768px) {
  .lesson-type {
    grid-template-columns: 1fr;
  }
  .lesson-type__option {
    padding: 16px;
  }
  .lesson-type__icon {
    width: 40px;
    height: 40px;
  }
}
/* css/blocks/panel.css */
.panel {
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
}
.panel--surface {
  border-color: transparent;
  background: var(--surface);
}
.panel__head {
  margin-bottom: 20px;
}
.panel__head--person {
  display: flex;
  align-items: center;
  gap: 14px;
}
.panel__avatar {
  width: 40px;
  height: 40px;
  font-size: 14px;
}
.panel__title {
  font-size: 20px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.panel__optional {
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--muted);
}
.panel__desc {
  margin-top: 4px;
  font-size: 15px;
  color: var(--muted);
}
.panel__body {
  display: grid;
  gap: 24px;
}
.panel__subtitle {
  margin-bottom: 10px;
  font-size: 16px;
  font-weight: 500;
}
@media (max-width: 768px) {
  .panel {
    padding: 20px;
  }
}
/* css/blocks/video-source.css */
.video-source__connect {
  display: flex;
  gap: 12px;
}
.video-source__connect .field__input {
  flex: 1;
}
.video-source__connect .btn {
  flex-shrink: 0;
}
.video-source__steps {
  max-inline-size: 75ch;
  display: grid;
  gap: 4px;
  margin-top: 12px;
  padding-left: 20px;
  font-size: 14px;
  color: var(--muted);
  list-style: decimal;
}
.video-source__info {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  margin-top: 14px;
}
.video-source__meta {
  display: grid;
  gap: 2px;
  min-width: 0;
  margin-right: auto;
}
.video-source__name {
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}
.video-source .field__error {
  color: var(--danger);
}
.video-source__url {
  overflow: hidden;
  font-size: 14px;
  color: var(--muted);
  white-space: nowrap;
  text-overflow: ellipsis;
}
.video-source__actions {
  display: flex;
  gap: 8px;
}
@media (max-width: 768px) {
  .video-source__actions .btn {
    min-height: 44px;
  }
  .video-source__connect {
    flex-direction: column;
  }
}
/* css/blocks/field-rows.css */
.field-rows {
  --rows-columns: minmax(0, 1fr) 36px;
}
.field-rows--timecodes {
  --rows-columns: 112px minmax(0, 1fr) 36px;
}
.field-rows--links {
  --rows-columns: minmax(0, 2fr) minmax(0, 3fr) 36px;
}
.field-rows--timecodes .field-rows__cell,
.field-rows--links .field-rows__cell {
  min-width: 0;
}
.field-rows--timecodes .field__error,
.field-rows--links .field__error {
  color: var(--danger);
}
.field-rows--options {
  --rows-columns: auto minmax(0, 1fr) 36px;
}
.field-rows--form {
  --rows-columns: minmax(0, 1fr) 200px auto 36px;
}
.field-rows__head {
  display: grid;
  grid-template-columns: var(--rows-columns);
  gap: 8px;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
}
.field-rows:not(:has(> .field-rows__list > .field-rows__item)) > .field-rows__head {
  display: none;
}
.field-rows__list {
  display: grid;
  gap: 8px;
}
.field-rows__item {
  display: grid;
  grid-template-columns: var(--rows-columns);
  align-items: center;
  gap: 8px;
}
.field-rows__check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 52px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  white-space: nowrap;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.field-rows__check:has(input:checked) {
  border-color: var(--success);
  background: var(--success-bg);
}
.field-rows__check input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--ink);
}
.field-rows__empty {
  padding: 16px;
  border: 1px dashed rgba(18, 19, 22, 0.2);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--muted);
  text-align: center;
}
.field-rows__list:has(> .field-rows__item) > .field-rows__empty {
  display: none;
}
.field-rows__settings {
  grid-column: 1 / -1;
  display: grid;
  gap: 8px;
}
.field-rows__settings:not(:has(> :not([hidden]))) {
  display: none;
}
.field-rows__add {
  margin-top: 12px;
}
.field-rows__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.field-rows__actions .field-rows__add {
  margin-top: 0;
}
@media (max-width: 768px) {
  .field-rows--timecodes {
    --rows-columns: 88px minmax(0, 1fr) 44px;
  }
  .field-rows--links {
    --rows-columns: minmax(0, 1fr) 44px;
  }
  .field-rows--timecodes .field-rows__remove,
  .field-rows--links .field-rows__remove {
    width: 44px;
    height: 44px;
  }
  .field-rows--timecodes .field-rows__add,
  .field-rows--links .field-rows__add {
    min-height: 44px;
  }
  .field-rows--form {
    --rows-columns: minmax(0, 1fr) 36px;
  }
  .field-rows--links .field-rows__head,
  .field-rows--form .field-rows__head {
    display: none;
  }
  .field-rows--links .field-rows__item,
  .field-rows--form > .field-rows__list > .field-rows__item {
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
  }
  .field-rows--links .field-rows__cell,
  .field-rows--form > .field-rows__list > .field-rows__item > .field-rows__cell,
  .field-rows--form > .field-rows__list > .field-rows__item > .field-rows__check {
    grid-column: 1;
  }
  .field-rows--links .field-rows__remove,
  .field-rows--form > .field-rows__list > .field-rows__item > .field-rows__remove {
    grid-column: 2;
    grid-row: 1;
  }
}
/* css/blocks/editor-bar.css */
.editor-bar {
  position: sticky;
  bottom: 0;
  z-index: 20;
  margin-top: 40px;
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}
.editor-bar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  min-height: 80px;
  padding-top: 14px;
  padding-bottom: 14px;
}
.editor-bar__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  color: var(--muted);
}
.editor-bar__status--dirty::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--signal);
}
.editor-bar__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
@media (max-width: 768px) {
  .editor-bar__inner {
    min-height: 0;
  }
  .editor-bar__actions {
    width: 100%;
  }
  .editor-bar__actions .btn {
    flex: 1;
  }
}
/* css/blocks/step-card.css */
.step-list {
  display: grid;
  gap: 16px;
}
.step-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
}
.step-card__head {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  padding: 20px 20px 16px;
}
.step-card__number {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: var(--ink);
  font-size: 18px;
  font-weight: 600;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}
.step-card__title {
  flex: 1;
  min-width: 0;
}
.step-card__actions {
  display: flex;
  gap: 2px;
  flex-shrink: 0;
  padding-bottom: 8px;
}
.step-card__toggle .icon {
  transition: transform var(--transition);
}
.step-card__toggle[aria-expanded='true'] .icon {
  transform: rotate(180deg);
}
.step-card__body {
  display: grid;
  gap: 12px;
  padding: 0 20px 20px;
}
.step-card__blocks {
  display: grid;
  gap: 12px;
}
.step-card__empty {
  padding: 16px;
  border: 1px dashed rgba(18, 19, 22, 0.2);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--muted);
  text-align: center;
}
.step-card__blocks:has(.block-card) .step-card__empty {
  display: none;
}
.step-card--single .step-card__body {
  padding-top: 20px;
  @media (max-width: 768px) {
    padding-top: 16px;
  }
}
.step-card__rule {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--muted);
}
.step-list__add {
  width: 100%;
  margin-top: 16px;
  border-style: dashed;
}
@media (max-width: 768px) {
  .step-card__head {
    flex-wrap: wrap;
    padding: 16px 16px 12px;
  }
  .step-card__number {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }
  .step-card__title {
    flex-basis: calc(100% - 52px);
  }
  .step-card__actions {
    width: 100%;
    justify-content: flex-end;
    padding-bottom: 0;
  }
  .step-card__actions .icon-btn {
    min-width: 44px;
    height: 44px;
  }
  .step-card__body {
    padding: 0 12px 16px;
  }
}
/* css/blocks/block-card.css */
.block-card {
  border-radius: var(--radius-sm);
  background: var(--surface);
}
.block-card__head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 10px 10px 16px;
}
.block-card__icon {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--white);
}
.block-card__type {
  margin-right: auto;
  font-size: 15px;
  font-weight: 500;
}
.block-card__task {
  font-size: 13px;
  font-weight: 400;
  color: var(--muted);
}
.block-card__actions {
  display: flex;
  gap: 2px;
}
.block-card__actions .icon-btn:hover {
  background: var(--white);
}
.block-card__body {
  display: grid;
  gap: 16px;
  padding: 4px 16px 16px;
}
.block-card__row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}
.editor__steps .field__error {
  color: var(--danger);
}
@media (max-width: 768px) {
  .block-card__head {
    padding-left: 12px;
    flex-wrap: wrap;
  }
  .block-card__actions {
    width: 100%;
    justify-content: flex-end;
  }
  .block-card__actions .icon-btn {
    min-width: 44px;
    height: 44px;
  }
  .block-card__body {
    padding: 4px 12px 12px;
  }
}
/* css/blocks/block-picker.css */
.block-picker__panel {
  display: grid;
  gap: 16px;
  margin-top: 12px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}
.block-picker__title {
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
}
.block-picker__list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 8px;
}
.block-picker__option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--white);
  font-size: 15px;
  text-align: left;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.block-picker__option:hover {
  border-color: var(--ink);
  background: var(--sky);
}
.block-picker__option:disabled {
  border-color: var(--border);
  background: var(--surface);
  color: var(--muted);
  cursor: not-allowed;
}
/* css/blocks/rich-text.css */
.rich-text {
  border: 1px solid rgba(18, 19, 22, 0.2);
  border-radius: var(--radius-sm);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.rich-text:hover {
  border-color: rgba(18, 19, 22, 0.4);
}
.rich-text:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 22%, transparent);
}
.field--error .rich-text {
  border-color: var(--error);
}
.rich-text__toolbar {
  position: sticky;
  top: var(--header-height);
  z-index: 5;
  border-radius: calc(var(--radius-sm) - 1px) calc(var(--radius-sm) - 1px) 0 0;
}
.rich-text__area {
  position: relative;
  min-height: 160px;
  padding: 14px 16px;
  cursor: text;
}
.rich-text__area:focus-visible {
  outline: none;
}
.rich-text__area--short {
  min-height: 120px;
}
.rich-text__area--empty::before {
  content: attr(data-placeholder);
  position: absolute;
  top: 14px;
  left: 16px;
  right: 16px;
  color: var(--placeholder);
  pointer-events: none;
}
/* css/blocks/format-bar.css */
.format-bar {
  padding: 6px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
}
.format-bar__buttons,
.format-bar__link {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
}
.format-bar__btn {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  min-width: 36px;
  height: 36px;
  padding: 0 8px;
  border: none;
  border-radius: 8px;
  background: none;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.format-bar__btn .icon {
  width: 18px;
  height: 18px;
}
.format-bar__btn:hover {
  background: rgba(18, 19, 22, 0.07);
}
.format-bar__btn[aria-pressed='true'] {
  background: rgba(18, 19, 22, 0.13);
}
.format-bar__btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: -2px;
}
.format-bar__divider {
  flex-shrink: 0;
  width: 1px;
  height: 20px;
  margin: 0 6px;
  background: rgba(18, 19, 22, 0.14);
}
.format-bar__glyph--bold {
  font-weight: 700;
}
.format-bar__glyph--italic {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 16px;
  font-style: italic;
}
.format-bar__glyph--underline {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.format-bar__glyph--strike {
  text-decoration: line-through;
}
.format-bar__glyph--mono {
  font-family: var(--font-mono);
  font-size: 12px;
}
.format-bar__link {
  flex-wrap: nowrap;
  gap: 8px;
}
.format-bar__input {
  flex: 1;
  min-width: 0;
  height: 36px;
  padding: 0 12px;
  border: 1px solid rgba(18, 19, 22, 0.2);
  border-radius: 8px;
  background: var(--white);
  font: inherit;
  font-size: 15px;
  color: var(--ink);
}
.format-bar__input::placeholder {
  color: var(--placeholder);
}
.format-bar__input:focus-visible {
  outline: none;
  border-color: var(--primary);
}
.format-bar__apply {
  flex-shrink: 0;
  height: 36px;
  padding: 0 14px;
  border: none;
  border-radius: 8px;
  background: var(--ink);
  font-size: 15px;
  font-weight: 500;
  color: var(--white);
  cursor: pointer;
  transition: background var(--transition);
}
.format-bar__apply:hover {
  background: var(--primary);
}
/* css/blocks/code-editor.css */
.code-editor {
  --lang-color: rgba(255, 255, 255, 0.4);
  display: grid;
  gap: 16px;
}
.code-editor:has(.code-editor__lang option[value='javascript']:checked) {
  --lang-color: #f7df1e;
}
.code-editor:has(.code-editor__lang option[value='html']:checked) {
  --lang-color: #f16529;
}
.code-editor:has(.code-editor__lang option[value='css']:checked) {
  --lang-color: #4e9bff;
}
.code-editor:has(.code-editor__lang option[value='php']:checked) {
  --lang-color: #8892bf;
}
.code-editor:has(.code-editor__lang option[value='sql']:checked) {
  --lang-color: #f29111;
}
.code-editor:has(.code-editor__lang option[value='bash']:checked) {
  --lang-color: #4eaa25;
}
.code-editor__frame {
  border-radius: var(--radius-sm);
  background: var(--dark);
  color: var(--white);
  transition: box-shadow var(--transition);
}
.code-editor__frame:focus-within {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 45%, transparent);
}
.field--error .code-editor__frame {
  box-shadow: 0 0 0 2px var(--error);
}
.code-editor__head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 8px 8px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.code-editor__dot {
  flex-shrink: 0;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--lang-color);
  transition: background var(--transition);
}
.code-editor__title {
  flex: 1;
  min-width: 0;
  height: 36px;
  padding: 0 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: none;
  font: inherit;
  font-size: 14px;
  color: var(--white);
  transition: border-color var(--transition), background var(--transition);
}
.code-editor__title::placeholder {
  color: var(--on-dark-muted);
}
.code-editor__title:hover {
  border-color: rgba(255, 255, 255, 0.14);
}
.code-editor__title:focus-visible {
  outline: none;
  border-color: rgba(255, 255, 255, 0.32);
  background: rgba(255, 255, 255, 0.06);
}
.code-editor__lang {
  flex-shrink: 0;
  height: 36px;
  padding: 0 34px 0 12px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-opacity='0.66' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat right 10px center / 16px;
  font: inherit;
  font-size: 14px;
  color: var(--white);
  appearance: none;
  cursor: pointer;
  transition: border-color var(--transition);
}
.code-editor__lang:hover {
  border-color: rgba(255, 255, 255, 0.32);
}
.code-editor__lang:focus-visible {
  outline: 2px solid var(--tint);
  outline-offset: -1px;
}
.code-editor__lang option {
  color: var(--ink);
}
.code-editor__source {
  display: block;
  width: 100%;
  min-height: 200px;
  padding: 18px;
  border: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background: none;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--white);
  tab-size: 2;
  resize: vertical;
}
.code-editor__source:focus-visible {
  outline: none;
}
.code-editor__source::placeholder,
.code-editor__frame .cm-placeholder {
  color: var(--on-dark-muted);
}
.code-editor__frame .cm-editor {
  min-height: 200px;
  max-height: 560px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  color: var(--white);
}
.code-editor__frame .cm-editor.cm-focused {
  outline: none;
}
.code-editor__frame .cm-editor .cm-scroller {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
}
.code-editor__frame .cm-editor .cm-content {
  min-height: 200px;
  padding: 18px 0;
  caret-color: var(--white);
}
.code-editor__frame .cm-editor .cm-line {
  padding: 0 18px;
}
.code-editor__frame .cm-editor .cm-cursor {
  border-left: 2px solid var(--white);
}
.code-editor__frame .cm-editor .cm-selectionBackground,
.code-editor__frame .cm-editor.cm-focused .cm-selectionBackground {
  background: rgba(130, 170, 255, 0.3);
}
.code-editor__frame .cm-editor .cm-matchingBracket {
  background: rgba(255, 255, 255, 0.14);
  color: inherit;
}
/* css/blocks/question-card.css */
.question-list {
  display: grid;
  gap: 16px;
}
.question-list__add {
  width: 100%;
  margin-top: 16px;
  border-style: dashed;
}
.question-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
}
.question-card__head {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  padding: 20px 20px 16px;
}
.question-card__number {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 18px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.question-card__title {
  flex: 1;
  min-width: 0;
}
.question-card__actions {
  display: flex;
  flex-shrink: 0;
  gap: 2px;
  padding-bottom: 8px;
}
.question-card__toggle .icon {
  transition: transform var(--transition);
}
.question-card__toggle[aria-expanded='true'] .icon {
  transform: rotate(180deg);
}
.question-card__body {
  display: grid;
  gap: 20px;
  padding: 0 20px 20px;
}
.question-card__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 12px;
}
.question-card__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}
.question-card__section {
  display: grid;
  gap: 12px;
  min-width: 0;
  margin: 0;
  padding: 16px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--surface);
}
.question-card__note {
  font-size: 14px;
  color: var(--muted);
}
@media (max-width: 768px) {
  .question-card__head {
    flex-wrap: wrap;
    padding: 16px 16px 12px;
  }
  .question-card__number {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }
  .question-card__title {
    flex-basis: calc(100% - 52px);
  }
  .question-card__actions {
    width: 100%;
    justify-content: flex-end;
    padding-bottom: 0;
  }
  .question-card__body {
    padding: 0 16px 16px;
  }
  .question-card__row {
    grid-template-columns: 1fr;
  }
  .question-card__section {
    padding: 12px;
  }
}
/* css/blocks/answer-view.css */
.answer-view {
  display: grid;
  gap: 18px;
}
.answer-view__label {
  margin-bottom: 4px;
  font-size: 14px;
  color: var(--muted);
}
.answer-view__value {
  line-height: 1.55;
  overflow-wrap: anywhere;
}
.answer-view__value a {
  color: var(--primary);
}
.answer-view__value--empty {
  color: var(--muted);
}
/* css/blocks/file-thumb.css */
.file-thumb {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--surface);
  object-fit: cover;
}
.file-thumb--doc {
  align-content: center;
  gap: 2px;
  color: var(--muted);
}
.file-thumb__icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.file-thumb__type {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1;
}
.file-thumb--lg {
  width: 100%;
  max-width: 280px;
  height: auto;
  aspect-ratio: 1;
  border-radius: var(--radius);
  object-fit: contain;
}
.file-thumb--lg.file-thumb--doc {
  gap: 8px;
}
.file-thumb--lg .file-thumb__icon {
  width: 48px;
  height: 48px;
}
.file-thumb--lg .file-thumb__type {
  font-size: 14px;
}
/* css/blocks/pagination.css */
.pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  margin-top: 32px;
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}
.pagination__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}
.pagination__link,
.pagination__gap {
  display: grid;
  place-items: center;
  min-width: 44px;
  height: 44px;
  padding: 0 8px;
  border-radius: var(--radius-sm);
}
.pagination__link {
  text-decoration: none;
  transition: background var(--transition);
}
.pagination__link:hover {
  background: var(--surface);
}
.pagination__link--current {
  background: var(--ink);
  color: var(--white);
  font-weight: 500;
}
.pagination__link--current:hover {
  background: var(--ink);
}
.pagination__gap {
  color: var(--muted);
}
.pagination__step {
  color: var(--primary);
}
/* css/blocks/content.css */
.content {
  font-size: 17px;
  line-height: 1.65;
}
.content > * + * {
  margin-top: 16px;
}
.content h2 {
  margin-top: 40px;
  font-size: 26px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.content h3 {
  margin-top: 32px;
  font-size: 20px;
  line-height: 1.3;
}
.content > :first-child {
  margin-top: 0;
}
.content ul,
.content ol {
  display: grid;
  gap: 8px;
}
.content li {
  position: relative;
  padding-left: 26px;
}
.content ul li::before {
  content: '';
  position: absolute;
  top: 0.68em;
  left: 6px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}
.content ol {
  counter-reset: content-list;
}
.content ol li {
  counter-increment: content-list;
}
.content ol li::before {
  content: counter(content-list) '.';
  position: absolute;
  left: 0;
  font-weight: 500;
  color: var(--primary);
}
.content a {
  color: var(--primary);
  text-underline-offset: 3px;
}
.content a:hover {
  color: var(--primary-dark);
}
.content strong {
  font-weight: 600;
}
.content code {
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.88em;
}
.content hr {
  height: 1px;
  margin: 32px 0;
  border: 0;
  background: var(--border);
}
.content blockquote {
  padding: 18px 22px;
  border-radius: var(--radius-sm);
  background: var(--surface);
}
@media (max-width: 768px) {
  .content {
    font-size: 16px;
  }
  .content h2 {
    margin-top: 32px;
    font-size: 22px;
  }
}
/* css/blocks/media.css */
.media__img {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.media__caption {
  margin-top: 10px;
  font-size: 14px;
  color: var(--muted);
}
/* css/blocks/note.css */
.note {
  display: flex;
  gap: 14px;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: var(--tint);
}
.note__icon {
  margin-top: 2px;
}
.note__title {
  font-weight: 600;
}
.note__text {
  margin-top: 4px;
  line-height: 1.55;
}
.note--tip {
  background: var(--lime);
}
.note--warning {
  background: var(--hot);
}
/* css/blocks/code-block.css */
.code-block {
  border-radius: var(--radius-sm);
  background: var(--dark);
  color: var(--white);
  overflow: hidden;
}
.code-block__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 10px 10px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.code-block__lang {
  font-size: 14px;
  color: var(--on-dark-muted);
}
.code-block__copy {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: none;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  font-size: 14px;
  color: var(--white);
  cursor: pointer;
  transition: background var(--transition);
}
.code-block__copy:hover {
  background: rgba(255, 255, 255, 0.16);
}
.code-block__copy--done {
  background: var(--success);
}
.code-block__pre {
  padding: 18px;
  overflow-x: auto;
}
.code-block__code {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  white-space: pre;
}
.code-block--wrap .code-block__code {
  white-space: pre-wrap;
}
/* css/blocks/code-token.css */
.code-token--comment,
.code-token--meta {
  color: #8b8f99;
}
.code-token--keyword {
  color: #ff7ab2;
}
.code-token--string {
  color: #c3e88d;
}
.code-token--literal {
  color: #f9ae58;
}
.code-token--function {
  color: #82aaff;
}
.code-token--property,
.code-token--escape {
  color: #89ddff;
}
.code-token--type {
  color: #ffcb6b;
}
.code-token--tag {
  color: #f07178;
}
.code-token--attribute {
  color: #c792ea;
}
.code-token--punctuation {
  color: rgba(255, 255, 255, 0.72);
}
/* css/blocks/file-list.css */
.file-list {
  display: grid;
  gap: 8px;
}
.file-list__link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px 12px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: border-color var(--transition), background var(--transition);
}
.file-list__link:hover {
  border-color: rgba(18, 19, 22, 0.28);
  background: var(--surface);
}
.file-list__type {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--surface);
  font-size: 12px;
  font-weight: 600;
}
.file-list__link:hover .file-list__type {
  background: var(--white);
}
.file-list__info {
  display: grid;
  min-width: 0;
  margin-right: auto;
}
.file-list__name {
  overflow: hidden;
  font-weight: 500;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.file-list__meta {
  font-size: 14px;
  color: var(--muted);
}
.file-list__action {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 500;
}
@media (max-width: 480px) {
  .file-list__action-text {
    display: none;
  }
}
/* css/blocks/player.css */
.player {
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  background: var(--dark);
  overflow: hidden;
}
.player__video {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--dark);
  object-fit: contain;
}
iframe.player__video {
  border: 0;
}
.player__message {
  display: grid;
  place-items: center;
  height: 100%;
  padding: 24px;
  color: var(--on-dark-muted);
  text-align: center;
}
/* css/blocks/timecodes.css */
.timecodes {
  margin-top: 16px;
}
.timecodes__track {
  display: flex;
  gap: 4px;
}
.timecodes__segment {
  position: relative;
  flex: var(--length) 1 0;
  height: 28px;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
}
.timecodes__segment::before {
  content: '';
  position: absolute;
  inset: 10px 0;
  border-radius: 99px;
  background: var(--surface);
  transition: background var(--transition), inset var(--transition);
}
.timecodes__segment:hover::before {
  inset: 8px 0;
  background: var(--tint);
}
.timecodes__played {
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 0;
  width: var(--played, 0%);
  border-radius: 99px;
  background: var(--primary);
  pointer-events: none;
}
.timecodes__list {
  display: grid;
  gap: 4px;
  margin-top: 8px;
  padding: 8px;
  border-radius: 18px;
  background-color: var(--surface);
}
.timecodes__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  width: 100%;
  padding: 10px 12px;
  border: none;
  border-radius: 10px;
  background: none;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition);
}
.timecodes__item:hover,
.timecodes__item[aria-current='true'] {
  background: var(--white);
}
.timecodes__time {
  flex-shrink: 0;
  min-width: 58px;
  font-size: 15px;
  font-weight: 600;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  text-align: right;
}
.timecodes__item[aria-current='true'] .timecodes__time {
  color: var(--ink);
}
.timecodes__name {
  margin-right: auto;
  line-height: 1.4;
}
.timecodes__now {
  display: none;
  flex-shrink: 0;
  font-size: 13px;
  font-weight: 500;
}
.timecodes__item[aria-current='true'] .timecodes__now {
  display: inline;
}
/* css/blocks/steps.css */
.steps__bar {
  position: sticky;
  top: var(--header-height);
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 8px;
  padding: 14px 0;
  background: var(--white);
}
.steps__counter {
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}
.steps__track {
  display: flex;
  flex-grow: 1;
  gap: 4px;
}
.steps__track > li {
  flex: 1 1 0;
}
.steps__segment {
  position: relative;
  display: block;
  width: 100%;
  height: 28px;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
}
.steps__segment::before {
  content: '';
  position: absolute;
  inset: 10px 0;
  border-radius: 99px;
  background: var(--surface);
  transition: background var(--transition), inset var(--transition);
}
.steps__segment--done::before {
  background: var(--primary);
}
.steps__segment--done:hover::before {
  inset: 8px 0;
  background: var(--primary-dark);
}
.steps__segment:disabled {
  cursor: default;
}
.steps__step {
  padding-top: 32px;
}
.steps__step + .steps__step {
  margin-top: 32px;
  border-top: 1px solid var(--border);
}
.steps__step--opened {
  animation: fadeUp 0.5s ease both;
}
.steps__title {
  margin-bottom: 20px;
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  scroll-margin-top: calc(var(--header-height) + 80px);
}
.steps__title:focus {
  outline: none;
}
.steps__body {
  display: grid;
  gap: 24px;
}
.steps__actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin-top: 28px;
}
.steps__hint {
  font-size: 14px;
  color: var(--muted);
}
.steps__finish {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 40px;
  padding: 20px 24px;
  border-radius: var(--radius);
  background: var(--success-bg);
  font-weight: 500;
}
@media (max-width: 768px) {
  .steps__title {
    font-size: 23px;
  }
}
/* css/blocks/lesson-article.css */
.lesson-article__finish {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 40px;
  padding: 20px 24px;
  border-radius: var(--radius);
  background: var(--success-bg);
  font-weight: 500;
  animation: fadeUp 0.5s ease both;
  @media (prefers-reduced-motion: reduce) {
    animation: none;
  }
}
.lesson-article__error {
  margin-top: 24px;
  font-size: 14px;
  color: var(--danger);
}
/* css/blocks/quiz.css */
.quiz {
  padding: 32px;
  border-radius: var(--radius-lg);
  background: var(--surface);
}
.quiz__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.quiz__name {
  font-size: 20px;
  font-weight: 500;
}
.quiz__rule {
  font-size: 15px;
  color: var(--muted);
}
.quiz__question {
  min-width: 0;
  border: 0;
}
.quiz__question:focus {
  outline: none;
}
.quiz__number {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  color: var(--muted);
}
.quiz__title {
  font-size: 21px;
  font-weight: 500;
  line-height: 1.3;
}
.quiz__hint {
  margin-top: 6px;
  font-size: 14px;
  color: var(--muted);
}
.quiz__options {
  display: grid;
  gap: 8px;
  margin-top: 20px;
}
.quiz__feedback {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  background: var(--white);
}
.quiz__verdict {
  font-weight: 600;
}
.quiz__feedback--correct .quiz__verdict {
  color: var(--success-text);
}
.quiz__feedback--wrong .quiz__verdict {
  color: var(--error-text);
}
.quiz__explain {
  margin-top: 2px;
  line-height: 1.55;
}
.quiz__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}
.quiz__summary:focus {
  outline: none;
}
.quiz__result {
  display: flex;
  align-items: center;
  gap: 20px;
}
.quiz__score {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: var(--white);
  font-size: 28px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.quiz__summary--passed .quiz__score {
  background: var(--success-bg);
  color: var(--success-text);
}
.quiz__summary--failed .quiz__score {
  background: var(--error-bg);
  color: var(--error-text);
}
.quiz__result-title {
  font-size: 24px;
  font-weight: 500;
  line-height: 1.2;
}
.quiz__result-text {
  margin-top: 6px;
  color: var(--muted);
}
.quiz__review {
  display: grid;
  gap: 6px;
  margin-top: 24px;
}
.quiz__review-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--white);
}
.quiz__review-mark {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--success-bg);
  color: var(--success);
}
.quiz__review-item--wrong .quiz__review-mark {
  background: var(--error-bg);
  color: var(--error);
}
.quiz__review-text {
  margin-right: auto;
}
.quiz__review-verdict {
  flex-shrink: 0;
  font-size: 14px;
  color: var(--muted);
}
.quiz--inline {
  padding: 0;
  background: none;
}
.quiz--inline .quiz__feedback {
  background: var(--surface);
}
@media (max-width: 768px) {
  .quiz {
    padding: 22px 18px;
  }
  .quiz--inline {
    padding: 0;
  }
  .quiz__title {
    font-size: 18px;
  }
  .quiz__result {
    align-items: flex-start;
  }
  .quiz__score {
    width: 72px;
    height: 72px;
    font-size: 22px;
  }
  .quiz__result-title {
    font-size: 20px;
  }
}
/* css/blocks/answer-form.css */
.answer-form {
  padding: 32px;
  border-radius: var(--radius-lg);
  background: var(--surface);
}
.answer-form__title {
  font-size: 22px;
  font-weight: 500;
  line-height: 1.25;
}
.answer-form__desc {
  margin-top: 6px;
  color: var(--muted);
}
.answer-form__fields {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}
.answer-form__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 20px;
}
.answer-form__actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin-top: 32px;
}
.answer-form__note {
  font-size: 14px;
  color: var(--muted);
}
.answer-form__done {
  display: flex;
  gap: 14px;
  margin-top: 24px;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: var(--success-bg);
}
.answer-form__done:focus {
  outline: none;
}
.answer-form__done-icon {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--success);
  color: var(--white);
}
.answer-form__done-title {
  font-weight: 600;
}
.answer-form__done-text {
  margin-top: 2px;
}
.answer-form__result {
  margin-top: 24px;
}
.answer-form__result:focus {
  outline: none;
}
.answer-form--inline {
  padding: 0;
  background: none;
}
@media (max-width: 768px) {
  .answer-form {
    padding: 22px 18px;
  }
  .answer-form--inline {
    padding: 0;
  }
  .answer-form__row {
    grid-template-columns: 1fr;
  }
}
/* css/blocks/field.css */
.field {
  min-width: 0;
  border: 0;
}
.field__label {
  display: block;
  margin-bottom: 8px;
  padding: 0;
  font-size: 15px;
  font-weight: 500;
}
.field__optional {
  font-weight: 400;
  color: var(--muted);
}
.field__input {
  display: block;
  width: 100%;
  min-height: 52px;
  padding: 14px 16px;
  border: 1px solid rgba(18, 19, 22, 0.2);
  border-radius: var(--radius-sm);
  background: var(--white);
  font: inherit;
  color: var(--ink);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.field__input::placeholder {
  color: var(--placeholder);
}
.field__input:hover {
  border-color: rgba(18, 19, 22, 0.4);
}
.field__input:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 22%, transparent);
}
.field__input:disabled {
  border-color: var(--border);
  background: var(--surface);
  color: var(--muted);
  cursor: not-allowed;
}
.field__input--textarea {
  min-height: 140px;
  line-height: 1.5;
  resize: vertical;
}
.field__input--short {
  height: 80px;
  min-height: 80px;
}
.field__input--select {
  padding-right: 48px;
  background: var(--white) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23121316' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat right 16px center / 18px;
  appearance: none;
  cursor: pointer;
}
.field__input--sm {
  width: auto;
  min-height: 38px;
  padding: 8px 40px 8px 12px;
  background-position: right 12px center;
  font-size: 14px;
}
.field__control {
  position: relative;
}
.field__input--reveal {
  padding-right: 56px;
}
.field__reveal {
  position: absolute;
  top: 50%;
  right: 8px;
  width: 40px;
  height: 40px;
  transform: translateY(-50%);
}
.field__reveal[aria-pressed='true'] {
  background: var(--surface);
  color: var(--ink);
}
.field__help {
  margin-top: 12px;
  font-size: 14px;
  color: var(--muted);
}
.field__error {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  font-size: 14px;
  color: var(--danger);
}
.field--error .field__input {
  border-color: var(--error);
}
.field__options {
  display: grid;
  gap: 8px;
}
.field:disabled .field__options {
  opacity: 0.5;
}
.field__options--pair {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
@media (max-width: 768px) {
  .field__options--pair {
    grid-template-columns: 1fr;
  }
}
.field__options--grid {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}
/* css/blocks/choice.css */
.choice {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--white);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.choice:hover {
  border-color: rgba(18, 19, 22, 0.32);
}
.choice:has(.choice__input:checked) {
  border-color: var(--ink);
}
.choice:has(.choice__input:disabled) {
  cursor: default;
}
.choice__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.choice__mark {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  margin-top: 1px;
  border: 1.5px solid rgba(18, 19, 22, 0.35);
  border-radius: 50%;
  background: var(--white);
  color: var(--white);
  transition: border-color var(--transition), background var(--transition);
}
.choice__input[type='checkbox'] + .choice__mark {
  border-radius: 6px;
}
.choice__mark .icon {
  width: 14px;
  height: 14px;
  stroke-width: 3;
  opacity: 0;
}
.choice__input:checked + .choice__mark {
  border-color: var(--ink);
  background: var(--ink);
}
.choice__input:checked + .choice__mark .icon {
  opacity: 1;
}
.choice__input:focus-visible + .choice__mark {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}
.choice__text {
  margin-right: auto;
  line-height: 1.4;
}
.choice__desc {
  display: block;
  margin-top: 2px;
  font-size: 14px;
  color: var(--muted);
}
.choice__verdict {
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 500;
}
.choice--correct,
.choice--correct:has(.choice__input:checked) {
  border-color: var(--success);
  background: var(--success-bg);
}
.choice--correct .choice__verdict {
  color: var(--success-text);
}
.choice--correct .choice__input:checked + .choice__mark {
  border-color: var(--success);
  background: var(--success);
}
.choice--wrong,
.choice--wrong:has(.choice__input:checked) {
  border-color: var(--error);
  background: var(--error-bg);
}
.choice--wrong .choice__verdict {
  color: var(--error-text);
}
.choice--wrong .choice__input:checked + .choice__mark {
  border-color: var(--error);
  background: var(--error);
}
.choice--shake {
  animation: shake 0.4s ease-in-out;
}
.choice--flat,
.choice--flat:hover,
.choice--flat:has(.choice__input:checked) {
  padding: 10px 12px;
  border-color: transparent;
}
.choice--flat:hover {
  background: var(--surface);
}
/* css/blocks/rating.css */
.rating__scale {
  display: grid;
  grid-template-columns: repeat(var(--count, 5), minmax(0, 1fr));
  gap: 8px;
}
.rating__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.rating__value {
  display: grid;
  place-items: center;
  height: 52px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--white);
  font-size: 18px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}
.rating__value:hover {
  border-color: rgba(18, 19, 22, 0.32);
}
.rating__input:checked + .rating__value {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--white);
}
.rating__input:focus-visible + .rating__value {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}
.rating__input:disabled + .rating__value {
  cursor: default;
}
.rating__captions {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}
/* css/blocks/upload.css */
.upload__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.upload__zone {
  display: grid;
  justify-items: center;
  gap: 6px;
  padding: 32px 20px;
  border: 1.5px dashed rgba(18, 19, 22, 0.25);
  border-radius: var(--radius-sm);
  background: var(--white);
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.upload__zone:hover,
.upload--drag .upload__zone {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--tint) 35%, var(--white));
}
.upload__input:focus-visible + .upload__zone {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
}
.upload__input:disabled + .upload__zone {
  background: var(--surface);
  cursor: not-allowed;
}
.upload__icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 4px;
  border-radius: 50%;
  background: var(--surface);
}
.upload__title {
  font-weight: 500;
}
.upload__link {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.upload__hint {
  font-size: 14px;
  color: var(--muted);
}
.upload__list {
  display: grid;
  gap: 6px;
  margin-top: 10px;
}
.upload__file {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 10px 10px 14px;
  border-radius: 10px;
  background: var(--white);
}
.upload__file-name {
  overflow: hidden;
  margin-right: auto;
  font-size: 15px;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.upload__file-size {
  flex-shrink: 0;
  font-size: 14px;
  color: var(--muted);
}
.upload__remove {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 8px;
  background: none;
  cursor: pointer;
  transition: background var(--transition);
}
.upload__remove:hover {
  background: var(--surface);
}
/* css/blocks/tabs.css */
.tabs {
  display: flex;
  gap: 32px;
  margin-bottom: 28px;
  overflow-x: auto;
  border-bottom: 1px solid var(--border);
  scrollbar-width: none;
}
.tabs__tab {
  position: relative;
  flex-shrink: 0;
  padding: 0 0 14px;
  border: none;
  background: none;
  font: inherit;
  font-size: 17px;
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--transition);
}
.tabs__tab:hover {
  color: var(--ink);
}
.tabs__tab[aria-selected='true'] {
  color: var(--ink);
}
.tabs__tab[aria-selected='true']::after {
  content: '';
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--ink);
}
.tabs__tab:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
  border-radius: 6px;
}
@media (max-width: 768px) {
  .tabs {
    gap: 24px;
    margin-bottom: 24px;
  }
  .tabs__tab {
    font-size: 16px;
  }
}
/* css/blocks/cover-field.css */
.cover-field__preview {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.cover-field__thumb {
  flex-shrink: 0;
  width: 88px;
  height: 88px;
  border-radius: 14px;
  background: var(--surface);
  object-fit: cover;
}
.cover-field__thumb--round {
  border-radius: 50%;
}
.cover-field__info {
  display: grid;
  flex: 1;
  gap: 2px;
  min-width: 160px;
}
.cover-field__name {
  overflow: hidden;
  font-weight: 500;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.cover-field__size {
  font-size: 14px;
  color: var(--muted);
}
.cover-field__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
/* css/blocks/cover-tone.css */
.cover-tone__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.cover-tone__swatch {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  padding: 5px;
  border: 1px solid rgba(18, 19, 22, 0.2);
  border-radius: var(--radius-sm);
  background: var(--white);
  cursor: pointer;
  transition: border-color var(--transition);
}
.cover-tone__swatch:hover {
  border-color: rgba(18, 19, 22, 0.4);
}
.cover-tone__swatch:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}
.cover-tone__swatch::-webkit-color-swatch-wrapper {
  padding: 0;
}
.cover-tone__swatch::-webkit-color-swatch {
  border: none;
  border-radius: 8px;
}
.cover-tone__swatch::-moz-color-swatch {
  border: none;
  border-radius: 8px;
}
.cover-tone__hex {
  width: 132px;
  font-family: var(--font-mono);
}
.cover-tone__contrast {
  margin-top: 12px;
  font-size: 14px;
  font-weight: 500;
}
.cover-tone__contrast--low {
  color: var(--error-text);
}
/* css/blocks/review.css */
.review {
  padding: 20px 22px;
  border-radius: var(--radius);
  background: var(--surface);
}
.review__head {
  display: flex;
  align-items: center;
  gap: 12px;
}
.review__icon {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--white);
}
.review__title {
  font-weight: 600;
}
.review__meta {
  font-size: 14px;
  color: var(--muted);
}
.review__text {
  margin-top: 12px;
  line-height: 1.55;
}
.review__comment {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  padding: 16px;
  border-radius: var(--radius-sm);
  background: var(--white);
}
.review__avatar {
  width: 36px;
  height: 36px;
  font-size: 13px;
}
.review__author {
  font-size: 14px;
  font-weight: 600;
}
.review__quote {
  margin-top: 2px;
  line-height: 1.55;
}
.review--pending {
  background: var(--tint);
}
.review--accepted {
  background: var(--success-bg);
}
.review--accepted .review__icon {
  background: var(--success);
  color: var(--white);
}
.review--revise {
  background: var(--hot);
}
/* css/sections/auth.css */
.auth {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 40px var(--gutter);
  background: var(--tint);
}
.auth__card {
  width: 100%;
  max-width: 460px;
  padding: 40px;
  border-radius: var(--radius-lg);
  background: var(--white);
}
.auth__logo {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.auth__title {
  margin-top: 36px;
  text-wrap: balance;
  font-size: 30px;
  line-height: 1.12;
  letter-spacing: -0.03em;
}
.auth__desc {
  margin-top: 12px;
  color: var(--muted);
  text-wrap: pretty;
}
.auth__note {
  margin-top: 24px;
}
.auth__email {
  font-weight: 500;
  color: var(--ink);
}
.auth__form {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}
.auth__error {
  margin-top: -12px;
}
.auth__resend {
  font-size: 15px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.auth__link {
  padding: 0;
  border: none;
  background: none;
  font-size: 15px;
  font-weight: 500;
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}
.auth__footer {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--muted);
}
@media (max-width: 480px) {
  .auth {
    place-items: start center;
    padding-top: 24px;
  }
  .auth__card {
    padding: 28px 20px;
  }
  .auth__title {
    font-size: 26px;
  }
}
/* css/sections/page.css */
.page {
  padding: 40px 0 96px;
}
.page__title {
  font-size: clamp(30px, 3.6vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}
.page__head {
  margin-bottom: 32px;
}
.page__desc {
  margin-top: 10px;
  color: var(--muted);
}
.page__section {
  margin-top: 56px;
}
.page__section-title {
  margin-bottom: 16px;
  font-size: 26px;
  letter-spacing: -0.02em;
}
.page__more {
  margin-top: 32px;
  font-size: 15px;
  color: var(--muted);
}
@media (max-width: 768px) {
  .page {
    padding: 24px 0 64px;
  }
  .page__head {
    margin-bottom: 24px;
  }
  .page__section {
    margin-top: 40px;
  }
}
/* css/sections/course-hero.css */
.course-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 24px;
  margin-top: 20px;
}
.course-hero__main {
  padding: 8px 0;
}
.course-hero__format {
  margin-bottom: 12px;
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
}
.course-hero__title {
  font-size: clamp(34px, 4.4vw, 56px);
  line-height: 1.02;
  letter-spacing: -0.035em;
}
.course-hero__desc {
  max-width: 600px;
  margin-top: 18px;
  font-size: 18px;
  color: var(--muted);
}
.course-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}
.course-hero__progress,
.course-hero__access {
  display: grid;
  align-content: start;
  gap: 20px;
  padding: 28px;
  border-radius: var(--radius-lg);
  background: var(--tint);
}
.course-hero__access {
  gap: 24px;
}
.course-hero__cover {
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  border-radius: var(--radius);
  object-fit: cover;
}
.course-hero__access-title {
  font-size: 22px;
  font-weight: 500;
  line-height: 1.2;
}
.course-hero__access-title:focus {
  outline: none;
}
.course-hero__access-text {
  margin-top: 8px;
}
.course-hero__form {
  display: grid;
  gap: 16px;
  margin-top: 20px;
}
.course-hero__access-action {
  margin-top: 20px;
}
.course-hero__progress-title {
  font-size: 22px;
  font-weight: 500;
  line-height: 1.2;
}
.course-hero__next {
  display: grid;
  gap: 2px;
}
.course-hero__next-label {
  font-size: 14px;
}
.course-hero__next-title {
  font-weight: 500;
}
.course-hero__next-chapter {
  font-size: 14px;
}
@media (max-width: 960px) {
  .course-hero {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 768px) {
  .course-hero__desc {
    font-size: 16px;
  }
  .course-hero__progress,
  .course-hero__access {
    padding: 22px;
  }
}
/* css/sections/catalog.css */
.catalog__head {
  margin-bottom: 40px;
}
.catalog__layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  align-items: start;
  gap: 56px;
}
.catalog__aside {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}
.catalog__nav {
  display: grid;
  gap: 2px;
}
.catalog__category {
  display: block;
  width: 100%;
  padding: 12px 16px;
  border: 0;
  border-radius: var(--radius-sm);
  background: none;
  font-size: 15px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition);
}
.catalog__category:hover {
  background: var(--surface);
}
.catalog__category[aria-pressed='true'] {
  background: var(--surface);
}
.catalog__category-count {
  margin-left: 6px;
  font-weight: 400;
  color: var(--muted);
}
.catalog__filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.catalog__count {
  margin: 40px 0 24px;
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--muted);
}
.catalog__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}
.catalog__empty {
  display: grid;
  margin-top: 40px;
  justify-items: start;
  gap: 16px;
  padding: 40px;
  border-radius: var(--radius);
  background: var(--surface);
}
.catalog__empty-title {
  font-size: 22px;
  letter-spacing: -0.02em;
}
.catalog__empty-text {
  margin-top: -8px;
  color: var(--muted);
}
@media (max-width: 960px) {
  .catalog__layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }
  .catalog__aside {
    position: static;
    margin: 0 calc(var(--gutter) * -1);
    padding: 0 var(--gutter);
    overflow-x: auto;
    scrollbar-width: none;
  }
  .catalog__nav {
    display: flex;
    gap: 4px;
    width: max-content;
  }
  .catalog__category {
    white-space: nowrap;
  }
}
@media (max-width: 768px) {
  .catalog__head {
    margin-bottom: 24px;
  }
  .catalog__count {
    margin: 28px 0 16px;
    font-size: 18px;
  }
  .catalog__grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }
  .catalog__empty {
    margin-top: 28px;
    padding: 24px;
  }
}
/* css/sections/profile.css */
.profile {
  --profile-intro: 280px;
  --profile-gap: 48px;
}
.profile .profile-card,
.profile__section,
.profile__actions {
  max-width: calc(var(--profile-intro) + var(--profile-gap) + 640px);
}
.profile__section {
  display: grid;
  grid-template-columns: var(--profile-intro) minmax(0, 1fr);
  gap: 24px var(--profile-gap);
  padding: 40px 0;
  border-bottom: 1px solid var(--border);
}
.profile__title {
  font-size: 21px;
  line-height: 1.25;
  letter-spacing: -0.015em;
}
.profile .page__desc {
  max-width: 72ch;
}
.profile__desc {
  margin-top: 8px;
  font-size: 15px;
  color: var(--muted);
}
.profile__fields {
  display: grid;
  align-content: start;
  gap: 24px;
}
.profile__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 16px;
}
.profile__actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 20px;
  padding: 32px 0 40px calc(var(--profile-intro) + var(--profile-gap));
  border-bottom: 1px solid var(--border);
}
.profile__status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
}
.profile__status:empty {
  display: none;
}
.profile__section:last-child {
  border-bottom: none;
}
@media (max-width: 860px) {
  .profile__section {
    grid-template-columns: minmax(0, 1fr);
    padding: 32px 0;
  }
  .profile__actions {
    padding: 24px 0 32px;
  }
}
@media (max-width: 560px) {
  .profile__row {
    grid-template-columns: minmax(0, 1fr);
  }
  .profile__actions .btn {
    width: 100%;
  }
}
/* css/sections/article.css */
.article {
  max-width: var(--reading);
}
.article__cover {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 32px;
  border-radius: var(--radius);
}
.article__list {
  border-top: 1px solid var(--border);
}
.article__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}
.article__item--cover {
  grid-template-columns: 160px minmax(0, 1fr);
}
.article__thumb {
  width: 160px;
  height: auto;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-sm);
  object-fit: cover;
}
.article__link {
  font-size: 20px;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.015em;
  text-decoration: none;
}
.article__link:hover {
  color: var(--primary);
}
.article__excerpt {
  margin-top: 6px;
  color: var(--muted);
}
@media (max-width: 560px) {
  .article__item--cover {
    grid-template-columns: minmax(0, 1fr);
  }
  .article__thumb {
    width: 100%;
  }
}
.article__head {
  margin-top: 20px;
}
/* css/sections/lesson.css */
.lesson {
  display: grid;
  grid-template-columns: var(--aside-width) minmax(0, 1fr);
  align-items: start;
  gap: var(--aside-gap);
  max-width: none;
  padding-top: 32px;
  padding-bottom: 96px;
}
.lesson__toggle {
  display: none;
}
.lesson--nav-hidden {
  grid-template-columns: minmax(0, 1fr);
}
.lesson--nav-hidden .lesson__aside {
  display: none;
}
.lesson__show {
  display: none;
}
.lesson--nav-hidden .lesson__show {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  position: fixed;
  top: calc(var(--header-height) + 24px);
  left: var(--gutter);
  z-index: 5;
  height: 44px;
  padding: 0 16px 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--white);
  font-weight: 500;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
  @media (max-width: 1240px) {
    width: 44px;
    padding: 0;
    justify-content: center;
    .lesson__show-text {
      position: absolute;
      width: 1px;
      height: 1px;
      overflow: hidden;
      clip-path: inset(50%);
      white-space: nowrap;
    }
  }
}
.lesson--nav-hidden .lesson__show:hover {
  border-color: var(--ink);
}
.lesson__aside {
  display: flex;
  flex-direction: column;
  position: sticky;
  top: calc(var(--header-height) + 24px);
  max-height: calc(100vh - var(--header-height) - 48px);
  padding: 20px 0 10px 10px;
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}
.lesson__nav {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
}
.lesson__nav::-webkit-scrollbar {
  width: 12px;
}
.lesson__nav::-webkit-scrollbar-track {
  margin: 16px 0;
  background: transparent;
}
.lesson__nav::-webkit-scrollbar-thumb {
  border: 4px solid transparent;
  border-radius: 99px;
  background: rgba(18, 19, 22, 0.14) padding-box;
}
.lesson__nav:hover::-webkit-scrollbar-thumb {
  background-color: rgba(18, 19, 22, 0.28);
}
.lesson__nav::-webkit-scrollbar-thumb:hover,
.lesson__nav::-webkit-scrollbar-thumb:active {
  border-width: 3px;
  background-color: rgba(18, 19, 22, 0.45);
}
@supports not selector(::-webkit-scrollbar) {
  .lesson__nav {
    scrollbar-width: thin;
    scrollbar-color: rgba(18, 19, 22, 0.2) transparent;
  }
}
.lesson__course {
  display: grid;
  flex-shrink: 0;
  gap: 12px;
  margin: 0 12px 12px 0;
  padding: 0 10px 16px;
  border-bottom: 1px solid var(--border);
}
.lesson__course-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}
.lesson__hide {
  margin: -6px -6px 0 0;
}
.lesson__hide:hover {
  background: var(--white);
}
.lesson__course-link {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.25;
  text-decoration: none;
}
.lesson__course-link:hover {
  color: var(--primary);
}
.lesson__main {
  width: 100%;
  min-width: 0;
  max-width: var(--reading);
  margin-inline: auto;
}
@media (max-width: 960px) {
  .lesson {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding-top: 16px;
    padding-bottom: 64px;
  }
  .lesson__toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--white);
    font-weight: 500;
    cursor: pointer;
  }
  .lesson__toggle-count {
    margin-left: auto;
    font-weight: 400;
    color: var(--muted);
  }
  .lesson__toggle-icon {
    transition: transform var(--transition);
  }
  .lesson__toggle[aria-expanded='true'] .lesson__toggle-icon {
    transform: rotate(180deg);
  }
  .lesson__aside {
    display: none;
    position: static;
    max-height: none;
    margin-top: 8px;
    padding-block: 0;
  }
  .lesson__course {
    margin-top: 20px;
  }
  .lesson__nav {
    padding-bottom: 10px;
  }
  .lesson__aside--open {
    display: block;
  }
  .lesson__hide,
  .lesson--nav-hidden .lesson__show {
    display: none;
  }
  .lesson--nav-hidden .lesson__aside--open {
    display: block;
  }
  .lesson__main {
    max-width: none;
    margin-top: 28px;
  }
}
[data-lesson-nav-animating] .lesson__aside,
[data-lesson-nav-animating] .lesson__show {
  view-transition-name: lesson-nav;
}
[data-lesson-nav-animating] .lesson__main {
  view-transition-name: lesson-main;
}
[data-lesson-nav-animating] .app-header {
  view-transition-name: app-header;
}
:root[data-lesson-nav-animating]::view-transition-old(root),
:root[data-lesson-nav-animating]::view-transition-new(root),
:root[data-lesson-nav-animating]::view-transition-old(app-header),
:root[data-lesson-nav-animating]::view-transition-new(app-header) {
  animation: none;
}
:root[data-lesson-nav-animating]::view-transition-group(lesson-nav),
:root[data-lesson-nav-animating]::view-transition-group(lesson-main) {
  animation-duration: 420ms;
  animation-timing-function: cubic-bezier(0.32, 0.72, 0, 1);
}
:root[data-lesson-nav-animating]::view-transition-image-pair(lesson-nav) {
  overflow: hidden;
  background: var(--surface);
  animation: 420ms cubic-bezier(0.32, 0.72, 0, 1) both;
}
:root[data-lesson-nav-animating='hide']::view-transition-image-pair(lesson-nav) {
  animation-name: lesson-nav-radius-hide;
}
:root[data-lesson-nav-animating='show']::view-transition-image-pair(lesson-nav) {
  animation-name: lesson-nav-radius-show;
}
:root[data-lesson-nav-animating]::view-transition-old(lesson-nav),
:root[data-lesson-nav-animating]::view-transition-new(lesson-nav),
:root[data-lesson-nav-animating]::view-transition-new(lesson-main) {
  inline-size: auto;
  block-size: auto;
  mix-blend-mode: normal;
}
:root[data-lesson-nav-animating='hide']::view-transition-old(lesson-nav) {
  animation: lesson-nav-out 160ms ease-out both;
}
:root[data-lesson-nav-animating='hide']::view-transition-new(lesson-nav) {
  animation: lesson-nav-in 200ms 220ms ease-out both;
}
:root[data-lesson-nav-animating='show']::view-transition-old(lesson-nav) {
  animation: lesson-nav-out 120ms ease-out both;
}
:root[data-lesson-nav-animating='show']::view-transition-new(lesson-nav) {
  animation: lesson-nav-in 240ms 140ms ease-out both;
}
:root[data-lesson-nav-animating]::view-transition-old(lesson-main) {
  animation: none;
  opacity: 0;
}
:root[data-lesson-nav-animating]::view-transition-new(lesson-main) {
  animation: none;
}
@keyframes lesson-nav-out {
  to {
    opacity: 0;
  }
}
@keyframes lesson-nav-in {
  from {
    opacity: 0;
  }
}
@keyframes lesson-nav-radius-hide {
  from {
    border-radius: var(--radius);
  }
  to {
    border-radius: var(--radius-sm);
  }
}
@keyframes lesson-nav-radius-show {
  from {
    border-radius: var(--radius-sm);
  }
  to {
    border-radius: var(--radius);
  }
}
/* css/sections/kit.css */
.kit {
  display: grid;
  gap: 72px;
}
.kit__group {
  display: grid;
  gap: 20px;
}
.kit__title {
  font-size: 28px;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.kit__desc {
  max-width: 640px;
  margin-top: -12px;
  color: var(--muted);
}
.kit__label {
  margin-top: 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
}
.kit__demo {
  display: grid;
  gap: 16px;
  max-width: var(--reading);
}
.kit__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.kit__aside {
  max-width: var(--aside-width);
  padding: 10px;
  border-radius: var(--radius);
  background: var(--surface);
}
/* css/sections/admin.css */
.admin__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px 32px;
  margin-bottom: 32px;
}
.admin__head--spaced {
  margin-top: 20px;
}
.admin__person {
  display: flex;
  align-items: center;
  gap: 20px;
  min-width: 0;
}
.admin__avatar {
  width: 64px;
  height: 64px;
  font-size: 22px;
  @media (max-width: 768px) {
    width: 48px;
    height: 48px;
    font-size: 17px;
  }
}
.admin__title-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
}
.admin__meta {
  margin-top: 10px;
  font-size: 14px;
  color: var(--muted);
}
.admin__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.admin__toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  margin-bottom: 16px;
  font-size: 14px;
  color: var(--muted);
}
.admin__toolbar-text {
  flex: 1 1 320px;
}
.admin__status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 21px;
  color: var(--ink);
}
.admin__status:empty {
  visibility: hidden;
}
.admin__status--head {
  margin-top: 8px;
  font-size: 14px;
}
.admin__status--head:empty {
  min-height: 0;
  margin-top: 0;
}
.admin__section + .admin__section {
  margin-top: 48px;
}
.admin__section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-size: 24px;
  letter-spacing: -0.02em;
}
.admin__search {
  max-width: 360px;
  margin: 0;
}
.admin__team-note {
  margin-top: 20px;
}
.admin__duration {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 12px;
}
.admin__form {
  display: grid;
  gap: 32px;
  max-width: 960px;
}
.admin__fields {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 20px;
}
.admin__note {
  display: flex;
  gap: 10px;
  max-width: 640px;
  font-size: 15px;
  color: var(--muted);
}
@media (max-width: 768px) {
  .admin__head {
    align-items: stretch;
    margin-bottom: 24px;
  }
  .admin__actions .btn {
    flex: 1;
  }
  .admin__fields {
    grid-template-columns: 1fr;
  }
}
.admin--editor,
.admin:has(> .admin__editor-tab:not([hidden])) {
  padding-bottom: 0;
}
.admin__answers {
  display: grid;
  gap: 16px;
}
.admin__result {
  max-width: 640px;
  margin-top: 16px;
}
.admin__filters {
  display: grid;
  grid-template-columns: minmax(0, 2fr) repeat(2, minmax(0, 1fr)) auto;
  align-items: end;
  gap: 16px;
  margin-bottom: 24px;
}
.admin__filters-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 52px;
}
.admin__link {
  color: var(--primary);
  font-size: 15px;
}
.admin__mono {
  font-family: var(--font-mono);
  font-size: 13px;
  overflow-wrap: anywhere;
}
@media (max-width: 860px) {
  .admin__filters {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .admin__filters > :first-child {
    grid-column: 1 / -1;
  }
}
@media (max-width: 560px) {
  .admin__filters {
    grid-template-columns: minmax(0, 1fr);
  }
}
.admin__line {
  display: block;
}
@media (max-width: 768px) {
  .people-rows__actions .icon-btn {
    width: 44px;
    height: 44px;
  }
}
/* css/sections/editor.css */
.editor {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  align-items: start;
  gap: 32px;
}
.editor__main {
  display: grid;
  gap: 20px;
}
.editor__steps,
.editor__questions {
  margin-top: 12px;
}
.editor__section-head {
  margin-bottom: 16px;
}
.editor__section-title {
  font-size: 26px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.editor__section-desc {
  max-width: 640px;
  margin-top: 6px;
  font-size: 15px;
  color: var(--muted);
}
.editor__aside {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  display: grid;
  gap: 20px;
}
.editor__facts {
  display: grid;
  gap: 18px;
}
.editor__fact-label {
  margin-bottom: 4px;
  font-size: 14px;
  color: var(--muted);
}
.editor__fact-value {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}
.editor__fact-value a {
  color: var(--primary);
  text-underline-offset: 3px;
}
.editor__fact-help {
  margin-top: 4px;
  font-size: 12px;
  color: var(--muted);
}
.editor__type-change {
  margin-top: 10px;
  @media (pointer: coarse) {
    min-height: 44px;
  }
}
.editor__pass {
  display: flex;
  align-items: center;
  gap: 12px;
}
.editor__pass-input {
  width: 96px;
}
.editor__pass-total {
  font-weight: 500;
}
.editor__delete {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0;
  border: none;
  background: none;
  font-size: 15px;
  color: var(--danger);
  cursor: pointer;
}
.editor__delete:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}
@media (max-width: 960px) {
  .editor {
    grid-template-columns: 1fr;
  }
  .editor__aside {
    position: static;
  }
}
/* css/utils/animations.css */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes shake {
  20%,
  60% {
    transform: translateX(-5px);
  }
  40%,
  80% {
    transform: translateX(5px);
  }
}
@keyframes pulse {
  50% {
    opacity: 0.35;
  }
}
.fade-up {
  animation: fadeUp 0.7s ease both;
}
.fade-up-2 {
  animation: fadeUp 0.7s 0.15s ease both;
}
.fade-up-3 {
  animation: fadeUp 0.7s 0.3s ease both;
}
/* css/utils/sr-only.css */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
/* css/utils/hidden.css */
[hidden] {
  display: none !important;
}