:root {
  color-scheme: light;
  --ink: #1d2440;
  --ink-soft: #616b86;
  --ink-faint: #8f98ae;
  --line: #e7eaf2;
  --paper: #ffffff;
  --canvas: #f4f6fa;
  --accent: #5266db;
  --accent-deep: #3f52c3;
  --accent-pale: #eef0ff;
  --lilac: #f4f1ff;
  --mint: #eaf8f3;
  --radius: 18px;
  --sidebar-width: 248px;
  --sidebar-width-collapsed: 76px;
  font-family: "Avenir Next", "Segoe UI", system-ui, -apple-system, sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background: var(--canvas);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.5;
}

body.menu-open { overflow: hidden; }

a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
button:disabled { cursor: not-allowed; opacity: .58; }

.skip-link {
  background: var(--ink);
  border-radius: 0 0 9px 0;
  color: var(--paper);
  font-size: 13px;
  font-weight: 750;
  left: 0;
  padding: 10px 14px;
  position: fixed;
  top: 0;
  transform: translateY(-120%);
  transition: transform .2s ease;
  z-index: 100;
}
.skip-link:focus { transform: translateY(0); }

.icon-button {
  align-items: center;
  background: transparent;
  border: 0;
  border-radius: 9px;
  color: var(--ink-soft);
  cursor: pointer;
  display: inline-flex;
  height: 34px;
  justify-content: center;
  padding: 0;
  width: 34px;
}
.icon-button:hover { background: #f3f5fb; color: var(--ink); }

:focus-visible {
  outline: 3px solid #99a7ff;
  outline-offset: 3px;
}

.app-shell { min-height: 100dvh; }

.sidebar {
  background: var(--paper);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  height: 100dvh;
  left: 0;
  padding: 28px 18px 20px;
  position: fixed;
  top: 0;
  transition: width .2s ease;
  width: var(--sidebar-width);
  z-index: 20;
}

.sidebar__top { align-items: center; display: flex; justify-content: space-between; margin: 0 10px 50px; }
.sidebar__actions { align-items: center; display: flex; gap: 4px; }
.brand { align-items: center; display: inline-flex; gap: 10px; letter-spacing: -.04em; }
.brand-mark { display: inline-flex; gap: 3px; height: 22px; transform: rotate(-12deg); width: 22px; }
.brand-mark span { background: var(--accent); border-radius: 3px; display: block; width: 9px; }
.brand-mark span:first-child { height: 15px; margin-top: 7px; opacity: .62; }
.brand-mark span:last-child { height: 21px; }
.brand-name { font-size: 20px; font-weight: 750; }
.brand-name span { color: var(--accent); }
.sidebar__collapse { font-size: 24px; line-height: 1; width: 30px; }
.sidebar__close, .menu-toggle { display: none; }

.nav-label, .eyebrow, .tip-card__eyebrow {
  color: var(--ink-faint);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: .14em;
  margin: 0 10px 12px;
  text-transform: uppercase;
}

.zh-hint {
  color: var(--ink-faint);
  display: block;
  font-size: .78em;
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.4;
  margin-top: 2px;
  text-transform: none;
}
.eyebrow .zh-hint { color: var(--ink-soft); font-size: 1em; }
h1 > .zh-hint { font-size: .25em; letter-spacing: 0; line-height: 1.35; margin-top: 9px; }
.level-state .zh-hint { color: currentColor; font-size: 9px; opacity: .78; }
.text-link .zh-hint { display: inline; font-size: 10px; margin-left: 5px; }
.button .zh-hint { color: rgb(255 255 255 / 82%); display: inline; font-size: 10px; margin-left: 6px; }
.button--secondary .zh-hint { color: currentColor; }
.vocab-card__state .zh-hint { font-size: 10px; }
.vocab-card__plural .zh-hint { display: inline; font-size: 10px; margin-left: 5px; }
.exercise-card > .zh-hint, .lesson-heading > .zh-hint, .backup-section > .zh-hint { margin-bottom: 10px; }

.nav-group { display: grid; gap: 4px; }
.nav-link { align-items: center; border-radius: 10px; color: var(--ink-soft); display: flex; font-size: 14px; font-weight: 600; gap: 13px; padding: 11px 12px; transition: background .2s ease, color .2s ease; }
.nav-link__copy { display: grid; gap: 1px; line-height: 1.2; }
.nav-link__copy .zh-hint { font-size: 10px; }
.nav-link:hover { background: #f7f8fc; color: var(--ink); }
.nav-link.is-active { background: var(--accent-pale); color: var(--accent-deep); }
.nav-icon { align-items: center; color: currentColor; display: inline-flex; font-size: 17px; font-weight: 700; height: 20px; justify-content: center; line-height: 1; width: 20px; }
.nav-link:nth-of-type(3) .nav-icon { font-size: 12px; letter-spacing: -.08em; }
.sidebar__bottom { margin-top: auto; }
.tip-card { background: var(--lilac); border-radius: 14px; margin: 0 3px 24px; overflow: hidden; padding: 16px 16px 14px; position: relative; }
.tip-card__eyebrow { color: var(--accent-deep); margin: 0 0 6px; }
.tip-card p { color: #535d81; font-size: 12px; line-height: 1.45; margin: 0; max-width: 160px; }
.tip-card__line { background: var(--accent); bottom: 0; height: 3px; left: 0; opacity: .7; position: absolute; width: 42%; }
.profile-chip { align-items: center; border-top: 1px solid var(--line); display: flex; gap: 10px; padding: 18px 8px 0; }
.avatar { align-items: center; background: #dfe4ff; border: 0; border-radius: 50%; color: var(--accent-deep); display: inline-flex; flex: 0 0 auto; font-size: 12px; font-weight: 800; height: 34px; justify-content: center; width: 34px; }
.profile-chip__copy { display: grid; gap: 1px; min-width: 0; }
.profile-chip__copy strong { font-size: 12px; }
.profile-chip__copy small { color: var(--ink-faint); font-size: 11px; }
.profile-chip__chevron { color: var(--ink-faint); font-size: 16px; letter-spacing: 1px; margin-left: auto; }

@media (min-width: 701px) {
body.sidebar-collapsed {
  --sidebar-width: var(--sidebar-width-collapsed);
}
body.sidebar-collapsed .sidebar {
  padding-left: 10px;
  padding-right: 10px;
}
body.sidebar-collapsed .sidebar__top {
  gap: 4px;
  margin-left: 0;
  margin-right: 0;
}
body.sidebar-collapsed .brand { gap: 0; }
body.sidebar-collapsed .brand-name,
body.sidebar-collapsed .nav-label,
body.sidebar-collapsed .nav-link__copy,
body.sidebar-collapsed .tip-card,
body.sidebar-collapsed .profile-chip__copy,
body.sidebar-collapsed .profile-chip__chevron { display: none; }
body.sidebar-collapsed .sidebar__actions { gap: 0; }
body.sidebar-collapsed .sidebar__collapse { transform: rotate(180deg); }
body.sidebar-collapsed .nav-link {
  gap: 0;
  justify-content: center;
  padding-left: 8px;
  padding-right: 8px;
}
body.sidebar-collapsed .nav-icon { width: 24px; }
body.sidebar-collapsed .profile-chip {
  justify-content: center;
  padding-left: 0;
  padding-right: 0;
}
}

.main-content { margin-left: var(--sidebar-width); min-height: 100dvh; transition: margin-left .2s ease; }
.topbar { align-items: center; background: rgb(244 246 250 / 86%); border-bottom: 1px solid rgb(231 234 242 / 75%); display: flex; height: 72px; justify-content: space-between; padding: 0 clamp(24px, 4vw, 62px); position: sticky; top: 0; backdrop-filter: blur(14px); z-index: 10; }
.breadcrumbs { align-items: center; color: var(--ink); display: flex; font-size: 12px; gap: 10px; }
.breadcrumbs__muted { color: var(--ink-faint); }
.breadcrumbs__muted .zh-hint, .breadcrumbs__zh { font-size: 10px; }
.topbar__actions { align-items: center; display: flex; gap: 20px; }
.streak { align-items: center; color: var(--ink-soft); display: flex; font-size: 12px; gap: 8px; }
.streak strong { color: var(--ink); }
.streak__dot { background: #e3a54d; border-radius: 50%; height: 7px; width: 7px; }
.avatar--small { cursor: pointer; height: 30px; width: 30px; }

.page-wrap { margin: 0 auto; max-width: 1180px; padding: 58px clamp(24px, 4vw, 62px) 34px; }
:where(.page-wrap, section)[id] { scroll-margin-top: 88px; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(37px, 4.5vw, 60px); letter-spacing: -.065em; line-height: 1.02; margin: 0; max-width: 650px; }
h1 em { color: var(--accent); font-style: normal; }

.learning-section { margin-bottom: 57px; }
.section-heading { align-items: end; display: flex; justify-content: space-between; margin-bottom: 21px; }
.section-heading .eyebrow { margin: 0 0 8px; }
.section-heading h2 { font-size: 24px; letter-spacing: -.045em; line-height: 1.12; margin: 0; }
.level-label { color: var(--accent-deep); font-size: 12px; font-weight: 800; letter-spacing: .08em; }
.level-state { background: var(--accent-pale); border-radius: 100px; color: var(--accent-deep); font-size: 10px; font-weight: 700; padding: 5px 9px; }
.text-link { color: var(--accent-deep); font-size: 12px; font-weight: 750; white-space: nowrap; }
.text-link span { display: inline-block; font-size: 17px; line-height: 0; margin-left: 4px; transition: transform .2s ease; }
.text-link:hover span { transform: translateX(3px); }

.button { align-items: center; background: var(--accent); border: 0; border-radius: 9px; color: white; cursor: pointer; display: inline-flex; font-size: 12px; font-weight: 750; justify-content: center; transition: background .2s ease, transform .2s ease; }
.button:hover { background: var(--accent-deep); }
.button:active { transform: translateY(1px); }
.toast { background: var(--ink); border-radius: 10px; bottom: 22px; color: white; font-size: 12px; left: 50%; opacity: 0; padding: 10px 15px; pointer-events: none; position: fixed; transform: translate(-50%, 8px); transition: opacity .2s ease, transform .2s ease; z-index: 50; }
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

.learning-hero { margin-bottom: 42px; max-width: 720px; }
.learning-hero h1, .lesson-heading h1 { margin: 0; }
.learning-hero > p:last-child, .lesson-heading > p:last-child { color: var(--ink-soft); line-height: 1.65; max-width: 620px; }
.lesson-heading h1 + p { color: var(--ink-soft); line-height: 1.65; max-width: 620px; }
.learning-summary { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); display: grid; grid-template-columns: repeat(3, 1fr); margin-bottom: 54px; overflow: hidden; }
.learning-summary > div { display: grid; gap: 2px; padding: 20px 22px; }
.learning-summary > div + div { border-left: 1px solid var(--line); }
.learning-summary strong { font-size: 25px; letter-spacing: -.05em; }
.learning-summary span { color: var(--ink-soft); font-size: 12px; }
.learning-card-grid, .vocabulary-grid { display: grid; gap: 18px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.learning-card, .vocab-card, .exercise-card, .lesson-finish, .empty-state { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); }
.learning-card { display: grid; gap: 18px; min-height: 230px; padding: 22px; }
.learning-card--a0 { background: linear-gradient(135deg, #fff, #f1f3ff); }
.learning-card--a1 { background: linear-gradient(135deg, #fff, #edf9f5); }
.learning-card > div:first-child { align-items: center; display: flex; justify-content: space-between; }
.learning-card h2 { font-size: 23px; letter-spacing: -.045em; margin: 0; }
.learning-card p { color: var(--ink-soft); font-size: 13px; margin: 0; }
.learning-card__footer { align-items: center; border-top: 1px solid var(--line); color: var(--ink-faint); display: flex; font-size: 12px; justify-content: space-between; padding-top: 14px; }
.back-link { color: var(--accent-deep); display: inline-block; font-size: 13px; font-weight: 700; margin-bottom: 26px; }
.lesson-heading { margin-bottom: 37px; max-width: 720px; min-width: 0; width: 100%; }
.lesson-heading h1 { font-size: clamp(35px, 4vw, 52px); letter-spacing: -.06em; min-width: 0; overflow-wrap: anywhere; white-space: normal; }
.reading-section { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); margin: 0 0 34px; max-width: 1120px; padding: 24px; }
.reading-section__heading { align-items: flex-start; display: flex; gap: 18px; justify-content: space-between; }
.reading-section__heading .eyebrow { margin-left: 0; }
.reading-section h2 { font-size: 28px; letter-spacing: -.045em; margin: 0; }
.reading-section__status { background: var(--accent-pale); border-radius: 100px; color: var(--accent-deep); font-size: 10px; font-weight: 700; padding: 5px 9px; white-space: nowrap; }
.reading-section__status .zh-hint { color: currentColor; font-size: 9px; }
.reading-layout { display: grid; gap: 18px; grid-template-columns: minmax(0, 1fr) 238px; margin-top: 22px; min-width: 0; }
.reading-main, .reading-section__heading, .reading-sentences, .reading-sentence { min-width: 0; }
.reading-controls { align-items: center; background: #f5f6f8; border-radius: 14px; display: grid; gap: 9px 10px; grid-template-columns: auto auto minmax(80px, 1fr) auto; padding: 16px; }
.reading-control { align-items: center; background: var(--paper); border: 1px solid #dce1ea; border-radius: 10px; color: var(--ink); cursor: pointer; display: inline-flex; font-size: 13px; font-weight: 750; justify-content: center; min-height: 38px; padding: 0 14px; }
.reading-control:hover { border-color: var(--accent); }
.reading-control--primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.reading-control--primary:hover { background: var(--accent-deep); }
.reading-control--reset { font-size: 17px; padding: 0; width: 42px; }
.reading-control .zh-hint { color: currentColor; display: inline; font-size: 10px; margin-left: 5px; }
.reading-progress { background: #e0e4ec; border-radius: 99px; height: 8px; min-width: 0; overflow: hidden; }
.reading-progress span { background: var(--accent); border-radius: inherit; display: block; height: 100%; width: 0; }
.reading-time { color: var(--ink-faint); font-size: 11px; white-space: nowrap; }
.reading-speed { align-items: center; color: var(--ink-faint); display: flex; font-size: 11px; gap: 8px; grid-column: 1 / span 2; }
.reading-speed .zh-hint { display: inline; font-size: 10px; margin-left: 4px; }
.reading-speed select { background: var(--paper); border: 1px solid #dce1ea; border-radius: 9px; color: var(--ink); font: inherit; padding: 8px 10px; }
.reading-controls__hint { color: #c0c7d3; font-size: 11px; grid-column: 3 / -1; margin: 0; text-align: right; }
.reading-controls__hint .zh-hint { display: inline; font-size: 10px; margin-left: 5px; }
.reading-sentences { border: 1px solid var(--line); margin-top: 22px; }
.reading-sentence { border-bottom: 1px solid var(--line); padding: 18px 20px 16px; }
.reading-sentence:last-child { border-bottom: 0; }
.reading-sentence__de { color: #2d62d8; font-family: Georgia, "Times New Roman", serif; font-size: clamp(18px, 2vw, 23px); line-height: 1.55; margin: 0; overflow-wrap: anywhere; text-decoration: underline; text-decoration-color: #c6d2ff; text-decoration-thickness: 1px; text-underline-offset: 4px; }
.reading-word-wrap { display: inline; position: relative; }
.reading-word { background: transparent; border: 0; border-bottom: 1px solid #b8c8ff; color: inherit; cursor: pointer; font: inherit; padding: 0; text-decoration: inherit; text-decoration-color: inherit; }
.reading-word:hover, .reading-word[aria-expanded="true"] { background: #eef0ff; border-radius: 4px; }
.word-popover { background: var(--paper); border: 1px solid #dbe1ef; border-radius: 12px; box-shadow: 0 12px 30px rgb(29 36 64 / 16%); color: var(--ink); display: grid; gap: 6px; left: 0; min-width: 200px; padding: 12px 14px; position: absolute; text-align: left; top: calc(100% + 10px); width: max-content; z-index: 8; }
.word-popover--above { bottom: calc(100% + 10px); top: auto; }
.word-popover--align-right { left: auto; right: 0; }
.word-popover[hidden] { display: none; }
.word-popover__top { align-items: center; display: flex; gap: 8px; }
.word-popover__top strong { font-family: Georgia, "Times New Roman", serif; font-size: 18px; }
.word-popover__meaning { color: var(--ink-soft); font-size: 13px; }
.word-popover__audio { align-items: center; align-self: start; background: var(--accent-pale); border: 0; border-radius: 9px; color: var(--accent-deep); cursor: pointer; display: inline-flex; font: inherit; font-size: 12px; font-weight: 750; gap: 4px; margin-top: 4px; padding: 8px 10px; }
.word-popover__audio:hover { background: #e1e5ff; }
.reading-control:disabled { cursor: wait; opacity: .72; }
.word-popover__plural { color: var(--ink-faint); font-size: 11px; }
.word-popover__example { border-left: 2px solid var(--accent-pale); color: var(--ink-soft); display: block; font-size: 12px; font-style: italic; margin: 2px 0 0; padding-left: 8px; }
.reading-sentence__zh { color: var(--ink-soft); font-size: 14px; line-height: 1.6; margin: 4px 0 0; }
.reading-sentence__zh.is-placeholder { color: var(--ink-faint); font-style: italic; }
.reading-vocab-panel { background: #f7f8fa; border: 1px solid #e0e4eb; border-radius: 14px; padding: 18px; }
.reading-vocab-panel .eyebrow { margin-left: 0; margin-right: 0; }
.reading-vocab-item { display: grid; gap: 1px; margin: 22px 0; }
.reading-vocab-item strong { font-family: Georgia, "Times New Roman", serif; font-size: 19px; }
.reading-vocab-item span { color: var(--ink-soft); font-size: 13px; }
.reading-vocab-empty { color: var(--ink-soft); font-size: 12px; }
.reading-vocab-button { background: var(--accent); border: 0; border-radius: 10px; color: #fff; cursor: pointer; font-size: 12px; font-weight: 750; margin-top: 12px; min-height: 42px; padding: 0 12px; width: 100%; }
.reading-vocab-button:hover { background: var(--accent-deep); }
.reading-vocab-button--secondary { background: var(--paper); border: 1px solid #dce1ea; color: var(--ink); }
.reading-vocab-button--secondary:hover { background: #eef0ff; }
.reading-vocab-button .zh-hint { color: currentColor; display: inline; font-size: 10px; margin-left: 5px; }
.reading-summary { background: var(--accent-pale); border-radius: 12px; margin-top: 22px; padding: 14px 16px; }
.reading-summary .eyebrow { color: var(--accent-deep); margin: 0 0 6px; }
.reading-summary p:last-child { color: var(--ink-soft); font-size: 13px; line-height: 1.65; margin: 0; }
.reading-section--empty { background: var(--lilac); }
.reading-section--empty h2 { font-size: 23px; }
.reading-section--empty > p:not(.eyebrow) { color: var(--ink-soft); font-size: 13px; margin: 8px 0 0; }
.vocabulary-grid { margin-bottom: 34px; }
.vocab-card { display: grid; gap: 8px; min-height: 205px; padding: 18px; }
.vocab-card__top { align-items: center; display: flex; justify-content: space-between; min-height: 25px; }
.vocab-card h3 { font-size: 25px; letter-spacing: -.045em; margin: 0; overflow-wrap: anywhere; }
.vocab-card p { color: var(--ink-soft); font-size: 13px; margin: 0; }
.vocab-card__plural, .vocab-card__state { color: var(--ink-faint); font-size: 11px; }
.vocab-card__example { border-left: 2px solid var(--accent-pale); font-style: italic; padding-left: 9px; }
.article-badge { border-radius: 100px; font-size: 11px; font-weight: 800; padding: 4px 8px; }
.article-badge--der { background: #e9f0ff; color: #315bb6; }
.article-badge--die { background: #ffedf1; color: #b23e65; }
.article-badge--das { background: #e9f8ee; color: #28764d; }
.text-button { align-self: end; background: transparent; border: 0; color: var(--accent-deep); cursor: pointer; font: inherit; font-size: 12px; font-weight: 700; padding: 3px 0; text-align: left; }
.exercise-card { margin: 30px 0; max-width: 760px; padding: 24px; }
.exercise-card h2 { font-size: 22px; letter-spacing: -.035em; margin: 0 0 17px; }
.grammar-section { margin: 38px 0; }
.grammar-grid { display: grid; gap: 14px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grammar-card { background: linear-gradient(145deg, #fff, #f7f5ff); border: 1px solid var(--line); border-radius: 16px; padding: 20px; }
.grammar-card h3 { color: var(--accent-deep); font-size: 17px; margin: 0 0 9px; }
.grammar-card p { color: var(--ink-soft); font-size: 14px; line-height: 1.65; margin: 0; }
.grammar-card blockquote { border-left: 3px solid var(--accent); color: var(--ink); font-size: 15px; font-style: italic; line-height: 1.6; margin: 16px 0 0; padding-left: 13px; }
.answer-options { display: grid; gap: 9px; }
.answer-option { background: #f7f8fc; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); cursor: pointer; font: inherit; padding: 12px 14px; text-align: left; }
.answer-option:hover { border-color: var(--accent); background: var(--accent-pale); }
.answer-option:disabled:hover { background: #f7f8fc; border-color: var(--line); }
.answer-row { display: flex; gap: 9px; }
.answer-row input { border: 1px solid var(--line); border-radius: 9px; color: var(--ink); font: inherit; min-width: 0; padding: 10px 12px; width: 100%; }
.exercise-feedback { border-radius: 9px; font-size: 13px; margin: 15px 0 0; padding: 10px 12px; }
.exercise-feedback.is-correct { background: var(--mint); color: #28764d; }
.exercise-feedback.is-wrong { background: #fff0f2; color: #9f3151; }
.lesson-finish { align-items: center; display: flex; justify-content: space-between; margin: 34px 0; max-width: 760px; padding: 19px 22px; }
.lesson-finish p { color: var(--ink-soft); font-size: 13px; margin: 3px 0 0; }
.empty-state { margin: 20px auto; max-width: 680px; padding: 36px; text-align: center; }
.empty-state h1, .empty-state h2 { margin: 0 0 10px; }
.empty-state p { color: var(--ink-soft); margin: 0 0 18px; }
.sr-only { height: 1px; margin: -1px; overflow: hidden; position: absolute; width: 1px; clip: rect(0, 0, 0, 0); }
.backup-section { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); margin: 0 0 54px; max-width: 760px; padding: 22px; }
.backup-section h2 { font-size: 22px; letter-spacing: -.035em; margin: 0 0 7px; }
.backup-section > p:not(.eyebrow) { color: var(--ink-soft); font-size: 13px; line-height: 1.6; margin: 0 0 18px; }
.backup-actions { align-items: center; display: flex; flex-wrap: wrap; gap: 10px; }
.backup-actions .button { min-height: 38px; padding: 0 14px; }
.button--secondary { background: var(--accent-pale); color: var(--accent-deep); }
.button--secondary:hover { background: #dfe3ff; }
.backup-actions input[type="file"] { height: 1px; opacity: 0; overflow: hidden; position: absolute; width: 1px; }
.backup-actions input[type="file"]:focus-visible + label { outline: 2px solid var(--accent); outline-offset: 3px; }

@media (max-width: 900px) {
  :root { --sidebar-width: 224px; }
  .page-wrap { padding-top: 46px; }
}

@media (max-width: 700px) {
  .sidebar { box-shadow: 10px 0 34px rgb(25 35 76 / 10%); transform: translateX(-105%); transition: transform .25s ease, visibility 0s linear .25s; visibility: hidden; }
  .sidebar.is-open { transform: translateX(0); transition-delay: 0s; visibility: visible; }
  .sidebar__top { margin-bottom: 40px; }
  .sidebar__collapse { display: none; }
  .sidebar__close { display: inline-flex; }
  .sidebar-scrim { background: rgb(22 28 52 / 30%); inset: 0; opacity: 0; pointer-events: none; position: fixed; transition: opacity .2s ease; z-index: 15; }
  .sidebar-scrim.is-visible { opacity: 1; pointer-events: auto; }
  .main-content { margin-left: 0; }
  .topbar { height: 64px; padding: 0 18px; }
  .menu-toggle { display: inline-flex; }
  .menu-toggle__bars { display: grid; gap: 4px; }
  .menu-toggle__bars i { background: currentColor; border-radius: 2px; display: block; height: 1.5px; width: 17px; }
  .breadcrumbs { margin-right: auto; margin-left: 14px; }
  .topbar__actions { gap: 0; }
  .streak { display: none; }
  .page-wrap { padding: 38px 18px 26px; }
  h1 { font-size: clamp(37px, 11vw, 53px); }
  .lesson-heading { max-width: calc(100vw - 36px); }
  .lesson-heading h1 { font-size: clamp(24px, 7.5vw, 34px); max-width: calc(100vw - 36px); overflow-wrap: anywhere; word-break: break-all; width: calc(100vw - 36px); }
  .lesson-heading h1 + p { font-size: 13px; max-width: calc(100vw - 36px); overflow-wrap: anywhere; white-space: normal; width: calc(100vw - 36px); }
  .learning-summary, .learning-card-grid, .vocabulary-grid, .grammar-grid { grid-template-columns: 1fr; }
  .learning-summary > div + div { border-left: 0; border-top: 1px solid var(--line); }
  .learning-summary > div { padding: 15px 17px; }
  .lesson-finish { align-items: flex-start; flex-direction: column; gap: 14px; }
  .answer-row { flex-direction: column; }
  .reading-section { padding: 18px; }
  .reading-section { max-width: calc(100vw - 36px); width: calc(100vw - 36px); }
  .reading-section__heading { display: grid; gap: 10px; }
  .reading-section h2 { font-size: 24px; }
  .reading-section__status { justify-self: start; }
  .reading-layout { grid-template-columns: 1fr; }
  .reading-controls { grid-template-columns: auto auto minmax(0, 1fr); }
  .reading-time { grid-column: 1 / -1; }
  .reading-speed { grid-column: 1 / -1; }
  .reading-controls__hint { grid-column: 1 / -1; text-align: left; }
  .reading-sentence { padding: 16px; }
  .reading-sentence__de { font-size: 16px; }
  .word-popover { max-width: calc(100vw - 48px); min-width: 180px; white-space: normal; }
  .learning-section { margin-bottom: 44px; }
  .section-heading { align-items: flex-start; gap: 10px; }
  .section-heading h2 { font-size: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}