:root {
  --bg: #f5f1e9;
  --paper: #fffdf8;
  --paper-strong: #ffffff;
  --ink: #25231f;
  --muted: #746f67;
  --line: #e5ddd1;
  --coral: #d95d4f;
  --coral-dark: #a93c34;
  --coral-soft: #f9e7e1;
  --jade: #167e69;
  --jade-soft: #dff2eb;
  --gold: #e9ad3f;
  --gold-soft: #fbf0cf;
  --blue: #5476a4;
  --blue-soft: #e8eef7;
  --danger: #c84555;
  --shadow: 0 20px 55px rgba(68, 50, 30, .09);
  --sidebar: 256px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { min-height: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 90% 3%, rgba(22, 126, 105, .08), transparent 28rem),
    radial-gradient(circle at 30% 100%, rgba(217, 93, 79, .06), transparent 28rem),
    var(--bg);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button, input, textarea, select { font: inherit; }
button { color: inherit; -webkit-tap-highlight-color: transparent; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
h1, h2, h3, h4, p { margin-top: 0; }

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

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 30;
  display: flex;
  width: var(--sidebar);
  flex-direction: column;
  padding: 26px 20px 20px;
  border-right: 1px solid var(--line);
  background: rgba(255, 253, 248, .9);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  width: 100%;
  padding: 0 7px 25px;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: none;
  text-align: left;
  cursor: pointer;
}

.brand-seal {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 13px 13px 13px 4px;
  color: #fff;
  background: var(--coral);
  box-shadow: 0 8px 18px rgba(217, 93, 79, .24);
  font: 800 22px/1 "Songti SC", "Noto Serif CJK SC", serif;
}

.brand strong, .brand small { display: block; }
.brand strong { margin-bottom: 3px; font-size: 15px; letter-spacing: -.02em; }
.brand small { color: var(--muted); font-size: 10px; }

.main-nav { display: grid; gap: 6px; margin-top: 24px; }

.nav-item {
  display: grid;
  grid-template-columns: 23px 1fr auto;
  gap: 11px;
  align-items: center;
  min-height: 46px;
  padding: 0 12px;
  border: 0;
  border-radius: 13px;
  color: var(--muted);
  background: transparent;
  font-size: 13px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: background .18s ease, color .18s ease, transform .18s ease;
}

.nav-item:hover { color: var(--ink); background: #f4eee4; transform: translateX(2px); }
.nav-item.active { color: var(--jade); background: var(--jade-soft); }
.nav-item svg:first-child { width: 19px; height: 19px; }

.nav-count {
  min-width: 20px;
  padding: 3px 6px;
  border-radius: 99px;
  color: #fff;
  background: var(--coral);
  font-size: 9px;
  text-align: center;
}

.sidebar-course {
  margin-top: 27px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 17px;
  background: rgba(255, 255, 255, .62);
}

.sidebar-course-head { display: flex; justify-content: space-between; gap: 10px; font-size: 11px; }
.sidebar-course-head span { color: var(--muted); font-weight: 700; }
.sidebar-course-head b { color: var(--jade); }

.mini-progress { height: 7px; margin: 12px 0 9px; border-radius: 9px; background: #e8e0d4; overflow: hidden; }
.mini-progress span { display: block; width: 0; height: 100%; border-radius: inherit; background: var(--jade); transition: width .4s ease; }
.sidebar-course p { margin: 0; color: var(--muted); font-size: 10px; }

.teacher-mini {
  display: grid;
  grid-template-columns: 39px 1fr 8px;
  gap: 10px;
  align-items: center;
  margin-top: auto;
  padding: 13px 9px 4px;
  border-top: 1px solid var(--line);
}

.teacher-avatar, .teacher-portrait {
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--jade);
  font-family: "Songti SC", "Noto Serif CJK SC", serif;
  font-weight: 800;
}

.teacher-avatar { width: 38px; height: 38px; border-radius: 50%; }
.teacher-mini strong, .teacher-mini small { display: block; }
.teacher-mini strong { font-size: 12px; }
.teacher-mini small { margin-top: 2px; color: var(--muted); font-size: 9px; }
.teacher-mini i { width: 8px; height: 8px; border-radius: 50%; background: #c6bfb4; }
.teacher-mini i.online { background: #21a780; box-shadow: 0 0 0 4px rgba(33, 167, 128, .12); }

.main-area { min-height: 100vh; margin-left: var(--sidebar); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  height: 72px;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(24px, 4vw, 60px);
  border-bottom: 1px solid rgba(229, 221, 209, .8);
  background: rgba(245, 241, 233, .84);
  backdrop-filter: blur(18px);
}

.mobile-menu { display: none; width: 40px; height: 40px; place-items: center; border: 1px solid var(--line); border-radius: 12px; background: var(--paper); cursor: pointer; }
.breadcrumb { display: flex; align-items: center; gap: 9px; font-size: 12px; }
.breadcrumb span { color: var(--muted); }
.breadcrumb span::after { margin-left: 9px; color: #b7afa4; content: '/'; }
.breadcrumb b { font-weight: 750; }
.topbar-actions { display: flex; align-items: center; gap: 12px; }

.install-button {
  display: none;
  min-height: 39px;
  align-items: center;
  gap: 7px;
  padding: 0 12px;
  border: 1px solid #bcdcd2;
  border-radius: 12px;
  color: var(--jade);
  background: var(--jade-soft);
  font-size: 11px;
  font-weight: 800;
  cursor: pointer;
}
.install-button.available { display: flex; }
.install-button svg { width: 17px; height: 17px; }

.daily-streak {
  display: flex;
  min-height: 39px;
  align-items: center;
  gap: 5px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, .6);
  font-size: 12px;
}

.daily-streak small { color: var(--muted); }

.sound-button {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(255, 255, 255, .65);
  cursor: pointer;
}

.sound-button.off { color: #aaa199; }

.page-view {
  display: none;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 48px 0 72px;
  animation: page-in .32s ease both;
}

.page-view.active { display: block; }

@keyframes page-in {
  from { opacity: 0; transform: translateY(7px); }
  to { opacity: 1; transform: translateY(0); }
}

.kicker, .section-overline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--coral-dark);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.kicker::before { width: 24px; height: 2px; content: ''; background: currentColor; }

.welcome-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, .62fr);
  gap: 35px;
  align-items: end;
  margin-bottom: 30px;
}

.welcome-row h1, .page-heading h1 {
  margin: 14px 0 14px;
  font-size: clamp(37px, 5vw, 61px);
  line-height: 1.03;
  letter-spacing: -.058em;
}

.welcome-row > div > p, .page-heading > p { max-width: 650px; margin-bottom: 0; color: var(--muted); font-size: 15px; line-height: 1.7; }

.teacher-card {
  display: flex;
  gap: 15px;
  align-items: flex-start;
  padding: 22px;
  border: 1px solid #cfe3dc;
  border-radius: 22px 22px 22px 7px;
  background: var(--jade-soft);
}

.teacher-portrait { width: 52px; height: 58px; flex: 0 0 auto; border-radius: 18px 18px 18px 5px; font-size: 26px; }
.teacher-card small { color: var(--jade); font-size: 10px; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.teacher-card p { margin: 8px 0 0; font-size: 13px; line-height: 1.65; }

.metric-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 13px; margin-bottom: 22px; }

.metric-card {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 93px;
  padding: 17px;
  border: 1px solid var(--line);
  border-radius: 19px;
  background: rgba(255, 253, 248, .82);
}

.metric-icon { display: grid; width: 50px; height: 50px; place-items: center; border-radius: 15px; font: 750 20px/1 "Songti SC", serif; }
.metric-icon.coral { color: var(--coral-dark); background: var(--coral-soft); }
.metric-icon.jade { color: var(--jade); background: var(--jade-soft); }
.metric-icon.gold { color: #a36b00; background: var(--gold-soft); }
.metric-card b, .metric-card small { display: block; }
.metric-card b { margin-bottom: 4px; font-size: 25px; letter-spacing: -.04em; }
.metric-card small { color: var(--muted); font-size: 10px; text-transform: uppercase; letter-spacing: .07em; }

.dashboard-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(300px, .6fr); gap: 18px; margin-bottom: 44px; }

.continue-card {
  position: relative;
  display: grid;
  min-height: 290px;
  grid-template-columns: 1fr auto;
  gap: 22px;
  padding: clamp(27px, 4vw, 40px);
  border-radius: 28px 28px 28px 9px;
  color: #fff;
  background: #283a37;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.continue-card::after {
  position: absolute;
  right: -20px;
  bottom: -55px;
  color: rgba(255,255,255,.055);
  content: attr(data-character);
  font: 800 220px/1 "Songti SC", serif;
}

.continue-card > div { position: relative; z-index: 2; align-self: center; }
.continue-card .continue-label { display: block; margin-bottom: 18px; color: #8bd3c0; font-size: 10px; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
.continue-card h2 { max-width: 550px; margin-bottom: 10px; font-size: clamp(29px, 4vw, 42px); letter-spacing: -.045em; }
.continue-card p { max-width: 560px; margin-bottom: 24px; color: rgba(255,255,255,.72); font-size: 13px; line-height: 1.6; }

.lesson-progress-line { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; }
.lesson-progress-line span:first-child { width: min(300px, 65%); height: 7px; border-radius: 9px; background: rgba(255,255,255,.14); overflow: hidden; }
.lesson-progress-line i { display: block; height: 100%; border-radius: inherit; background: #6cc3aa; }
.lesson-progress-line small { color: rgba(255,255,255,.67); }

.light-button, .primary-button, .outline-button, .text-button {
  border: 0;
  font-weight: 800;
  cursor: pointer;
  transition: transform .18s ease, background .18s ease, border-color .18s ease;
}

.light-button { min-height: 48px; padding: 0 20px; border-radius: 14px 14px 14px 4px; color: #203c35; background: #f3c86e; }
.light-button:hover, .primary-button:hover { transform: translateY(-2px); }
.continue-number { position: relative; z-index: 2; align-self: start; color: rgba(255,255,255,.16); font: 800 72px/1 serif; }

.study-method { padding: 25px; border: 1px solid var(--line); border-radius: 28px 28px 9px 28px; background: var(--paper); }
.study-method h3 { margin: 8px 0 20px; font-size: 21px; letter-spacing: -.03em; }
.study-method ol { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.study-method li { display: grid; grid-template-columns: 29px 1fr; gap: 10px; align-items: center; }
.study-method li > b { display: grid; width: 29px; height: 29px; place-items: center; border-radius: 9px; color: var(--jade); background: var(--jade-soft); font-size: 11px; }
.study-method strong, .study-method small { display: block; }
.study-method strong { font-size: 12px; }
.study-method small { margin-top: 2px; color: var(--muted); font-size: 10px; }

.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 17px; }
.section-heading h2 { margin: 7px 0 0; font-size: 28px; letter-spacing: -.04em; }
.text-button { padding: 8px 0; color: var(--jade); background: none; font-size: 12px; }

.lesson-preview-list { display: grid; gap: 10px; }

.lesson-preview {
  display: grid;
  grid-template-columns: 54px 1fr auto auto;
  gap: 15px;
  align-items: center;
  min-height: 82px;
  padding: 13px 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 253, 248, .78);
  cursor: pointer;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}

.lesson-preview:hover { transform: translateX(3px); border-color: #cfc2b2; background: #fff; }
.lesson-preview-icon { display: grid; width: 52px; height: 52px; place-items: center; border-radius: 15px; color: var(--coral-dark); background: var(--coral-soft); font: 800 24px/1 "Songti SC", serif; }
.lesson-preview h3 { margin: 0 0 4px; font-size: 15px; }
.lesson-preview p { margin: 0; color: var(--muted); font-size: 11px; }
.lesson-preview .status { padding: 5px 9px; border-radius: 99px; color: var(--muted); background: #eee8de; font-size: 9px; font-weight: 800; }
.lesson-preview .status.done { color: var(--jade); background: var(--jade-soft); }
.lesson-preview .status.current { color: var(--coral-dark); background: var(--coral-soft); }
.lesson-preview > small { color: var(--muted); font-size: 10px; }

.page-heading { margin-bottom: 32px; }
.page-heading h1 { margin-bottom: 12px; }

.level-summary-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 11px; margin-bottom: 24px; }
.level-summary-card { padding: 18px; border: 1px solid var(--line); border-radius: 20px 20px 20px 7px; color: var(--ink); background: rgba(255,253,248,.82); text-align: left; cursor: pointer; transition: .18s ease; }
.level-summary-card:hover, .level-summary-card.active { border-color: #6aa996; background: #f4fbf8; transform: translateY(-2px); }
.level-summary-card > span { display: flex; align-items: baseline; justify-content: space-between; gap: 7px; }
.level-summary-card > span b { color: var(--coral-dark); font-size: 18px; }
.level-summary-card > span small, .level-summary-card > small { color: var(--muted); font-size: 9px; }
.level-summary-card > strong { display: block; margin-top: 15px; font-size: 24px; }
.level-summary-card > strong small { color: var(--muted); font-size: 9px; font-weight: 700; text-transform: uppercase; }
.level-summary-card > p { min-height: 50px; margin: 9px 0 15px; color: var(--muted); font-size: 10px; line-height: 1.55; }
.level-summary-card > div { height: 5px; margin-bottom: 8px; border-radius: 9px; background: #e8e1d7; overflow: hidden; }
.level-summary-card > div i { display: block; height: 100%; border-radius: inherit; background: var(--jade); }

.level-filter { position: sticky; top: 76px; z-index: 20; display: flex; gap: 7px; margin: 0 0 27px; padding: 9px; border: 1px solid var(--line); border-radius: 16px; background: rgba(247,243,236,.93); backdrop-filter: blur(12px); overflow-x: auto; }
.level-filter button { min-height: 36px; flex: 1 0 auto; padding: 0 15px; border: 0; border-radius: 10px; color: var(--muted); background: transparent; font-size: 10px; font-weight: 800; cursor: pointer; }
.level-filter button.active { color: #fff; background: var(--jade); }

.course-levels { display: grid; gap: 42px; }
.course-level-heading { display: flex; align-items: end; justify-content: space-between; gap: 18px; margin-bottom: 15px; }
.course-level-heading > div { display: flex; align-items: center; gap: 11px; }
.course-level-heading span { padding: 6px 9px; border-radius: 8px; color: var(--coral-dark); background: var(--coral-soft); font-size: 9px; font-weight: 900; letter-spacing: .08em; }
.course-level-heading h2 { margin: 0; font-size: 25px; }
.course-level-heading p { margin: 0; color: var(--muted); font-size: 10px; }
.course-map { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 15px; }

.course-card {
  position: relative;
  min-height: 252px;
  padding: 27px;
  border: 1px solid var(--line);
  border-radius: 25px 25px 25px 8px;
  background: rgba(255, 253, 248, .84);
  overflow: hidden;
}

.course-card::after { position: absolute; right: -5px; bottom: -35px; color: rgba(217, 93, 79, .05); content: attr(data-character); font: 800 150px/1 "Songti SC", serif; }
.course-card-top { position: relative; z-index: 2; display: flex; align-items: center; justify-content: space-between; }
.course-number { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 13px; color: #fff; background: var(--coral); font-weight: 850; }
.course-card.completed .course-number { background: var(--jade); }
.course-card.checkpoint { border-color: #d6b56e; background: linear-gradient(145deg, rgba(255,250,235,.95), rgba(255,253,248,.86)); }
.course-card.checkpoint .course-number { background: #b98116; }
.course-duration { color: var(--muted); font-size: 10px; }
.course-level-tag { position: relative; z-index: 2; display: inline-block; margin-top: 17px; color: var(--jade); font-size: 9px; font-weight: 900; letter-spacing: .09em; }
.course-card h2 { position: relative; z-index: 2; margin: 7px 0; font-size: 23px; letter-spacing: -.035em; }
.course-card > p { position: relative; z-index: 2; min-height: 42px; color: var(--muted); font-size: 12px; line-height: 1.55; }
.course-card-footer { position: absolute; right: 27px; bottom: 23px; left: 27px; z-index: 2; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.course-card-footer small { color: var(--muted); font-size: 10px; }

.outline-button { min-height: 38px; padding: 0 14px; border: 1px solid var(--line); border-radius: 12px; color: var(--jade); background: #fff; font-size: 11px; }
.outline-button:hover { border-color: var(--jade); background: var(--jade-soft); }

.lexicon-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 18px; }
.lexicon-metrics article { display: flex; min-height: 82px; gap: 12px; align-items: center; padding: 14px 17px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,253,248,.82); }
.lexicon-metrics article > span { display: grid; width: 43px; height: 43px; flex: 0 0 auto; place-items: center; border-radius: 13px; color: var(--jade); background: var(--jade-soft); font: 800 18px/1 "Songti SC", serif; }
.lexicon-metrics b, .lexicon-metrics small { display: block; }
.lexicon-metrics b { margin-bottom: 3px; font-size: 23px; }
.lexicon-metrics small { color: var(--muted); font-size: 9px; text-transform: uppercase; letter-spacing: .05em; }

.lexicon-toolbar { position: sticky; top: 76px; z-index: 20; display: grid; grid-template-columns: minmax(260px, 1fr) auto; gap: 10px; padding: 10px; border: 1px solid var(--line); border-radius: 17px; background: rgba(247,243,236,.94); backdrop-filter: blur(12px); }
.lexicon-toolbar label { display: grid; grid-template-columns: 30px 1fr; align-items: center; min-height: 42px; padding: 0 8px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.lexicon-toolbar label > span { color: var(--muted); font-size: 19px; text-align: center; }
.lexicon-toolbar input { width: 100%; border: 0; outline: 0; color: var(--ink); background: transparent; font-size: 12px; }
.lexicon-toolbar > div { display: flex; gap: 5px; overflow-x: auto; }
.lexicon-toolbar > div button { flex: 0 0 auto; padding: 0 11px; border: 0; border-radius: 10px; color: var(--muted); background: transparent; font-size: 9px; font-weight: 800; cursor: pointer; }
.lexicon-toolbar > div button.active { color: #fff; background: var(--jade); }
.lexicon-result-line { display: flex; justify-content: space-between; gap: 15px; margin: 15px 2px 10px; color: var(--muted); font-size: 10px; }
.lexicon-result-line b { color: var(--ink); }
.lexicon-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
.lexicon-grid > .empty-state { grid-column: 1 / -1; }
.lexicon-card { display: grid; grid-template-columns: 36px minmax(0, 1fr) auto 36px; gap: 10px; align-items: center; min-height: 118px; padding: 13px; border: 1px solid var(--line); border-radius: 17px; background: rgba(255,253,248,.82); }
.lexicon-card.known { border-color: #a8cebf; background: #f6fcf9; }
.lexicon-index { color: #b2aaa0; font-size: 9px; font-weight: 800; }
.lexicon-word b { display: inline-block; margin-right: 9px; font: 800 24px/1.2 "Songti SC", serif; }
.lexicon-word > span { color: var(--jade); font-size: 11px; }
.lexicon-word p { margin: 6px 0 0; color: var(--muted); font-size: 10px; line-height: 1.45; }
.lexicon-level { align-self: start; padding: 4px 6px; border-radius: 7px; color: var(--coral-dark); background: var(--coral-soft); font-size: 8px; font-weight: 850; }
.lexicon-audio { display: grid; width: 34px; height: 34px; place-items: center; border: 0; border-radius: 50%; color: var(--jade); background: var(--jade-soft); cursor: pointer; }
.lexicon-known { grid-column: 2 / -1; justify-self: start; padding: 5px 9px; border: 1px solid var(--line); border-radius: 9px; color: var(--muted); background: #fff; font-size: 9px; font-weight: 750; cursor: pointer; }
.lexicon-card.known .lexicon-known { border-color: transparent; color: var(--jade); background: var(--jade-soft); }
.load-more-button { display: block; min-width: 180px; min-height: 44px; margin: 20px auto; padding: 0 20px; border: 1px solid var(--line); border-radius: 13px; color: var(--jade); background: #fff; font-weight: 800; cursor: pointer; }
.data-attribution { margin: 25px auto 0; color: var(--muted); font-size: 9px; line-height: 1.5; text-align: center; }
.data-attribution a { color: var(--jade); }

.review-content { min-height: 350px; }
.empty-state { padding: 60px 24px; border: 1px dashed #d4c9ba; border-radius: 25px; background: rgba(255,255,255,.44); text-align: center; }
.empty-symbol { display: grid; width: 76px; height: 76px; place-items: center; margin: 0 auto 20px; border-radius: 50%; color: var(--jade); background: var(--jade-soft); font: 800 32px/1 "Songti SC", serif; }
.empty-state h2 { margin-bottom: 9px; }
.empty-state p { max-width: 500px; margin: 0 auto; color: var(--muted); line-height: 1.6; }

.review-list { display: grid; gap: 12px; }
.review-item { display: grid; grid-template-columns: 43px 1fr auto; gap: 14px; align-items: start; padding: 19px; border: 1px solid var(--line); border-radius: 18px; background: var(--paper); }
.review-item > span { display: grid; width: 43px; height: 43px; place-items: center; border-radius: 13px; color: var(--coral-dark); background: var(--coral-soft); font: 800 20px/1 "Songti SC", serif; }
.review-item h3 { margin: 2px 0 6px; font-size: 14px; }
.review-item p { margin: 0 0 8px; color: var(--muted); font-size: 12px; line-height: 1.55; }
.review-item small { color: var(--jade); font-size: 11px; }
.review-item button { border: 0; color: #a9a198; background: none; cursor: pointer; }

.lesson-view { width: min(1060px, calc(100% - 48px)); }

.lesson-hero {
  position: relative;
  min-height: 250px;
  padding: clamp(28px, 5vw, 48px);
  border-radius: 31px 31px 31px 10px;
  color: #fff;
  background: #293a38;
  overflow: hidden;
}

.lesson-hero::after { position: absolute; right: 16px; bottom: -55px; color: rgba(255,255,255,.06); content: attr(data-character); font: 800 230px/1 "Songti SC", serif; }
.lesson-hero-top { position: relative; z-index: 2; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.back-button { display: inline-flex; align-items: center; gap: 7px; padding: 0; border: 0; color: rgba(255,255,255,.7); background: none; font-size: 11px; font-weight: 750; cursor: pointer; }
.back-button:hover { color: #fff; }
.lesson-duration { padding: 7px 10px; border-radius: 99px; color: #b6dacd; background: rgba(255,255,255,.08); font-size: 10px; }
.lesson-hero h1 { position: relative; z-index: 2; margin: 32px 0 7px; font-size: clamp(34px, 5vw, 54px); letter-spacing: -.05em; }
.lesson-level-badge { position: relative; z-index: 2; display: inline-block; margin-top: 28px; padding: 7px 10px; border-radius: 9px; color: #f4d58c; background: rgba(255,255,255,.1); font-size: 9px; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.lesson-level-badge + h1 { margin-top: 12px; }
.lesson-hero > p { position: relative; z-index: 2; max-width: 650px; margin-bottom: 24px; color: rgba(255,255,255,.68); line-height: 1.6; }
.lesson-goals { position: relative; z-index: 2; display: flex; flex-wrap: wrap; gap: 7px; }
.lesson-goals span { padding: 7px 10px; border: 1px solid rgba(255,255,255,.13); border-radius: 99px; color: rgba(255,255,255,.76); background: rgba(255,255,255,.05); font-size: 10px; }

.lesson-tabs {
  position: sticky;
  top: 72px;
  z-index: 15;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 4px;
  margin: 18px 0 22px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 17px;
  background: rgba(255, 253, 248, .91);
  backdrop-filter: blur(15px);
}

.lesson-tab { min-height: 42px; padding: 0 8px; border: 0; border-radius: 12px; color: var(--muted); background: transparent; font-size: 11px; font-weight: 800; cursor: pointer; }
.lesson-tab.active { color: #fff; background: var(--jade); }
.lesson-tab.done::after { margin-left: 5px; color: var(--jade); content: '✓'; }
.lesson-tab.active.done::after { color: #fff; }

.lesson-content { min-height: 500px; }
.content-panel { padding: clamp(24px, 4vw, 40px); border: 1px solid var(--line); border-radius: 27px 27px 27px 8px; background: rgba(255,253,248,.88); box-shadow: var(--shadow); }
.panel-heading { display: flex; align-items: start; justify-content: space-between; gap: 18px; margin-bottom: 28px; }
.panel-heading h2 { margin: 6px 0 7px; font-size: 30px; letter-spacing: -.04em; }
.panel-heading p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.55; }
.step-number { display: grid; width: 44px; height: 44px; flex: 0 0 auto; place-items: center; border-radius: 14px; color: var(--jade); background: var(--jade-soft); font-weight: 850; }

.objectives-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 11px; margin: 27px 0; }
.objective { min-height: 120px; padding: 18px; border: 1px solid var(--line); border-radius: 17px; background: #fff; }
.objective b { display: grid; width: 26px; height: 26px; place-items: center; margin-bottom: 15px; border-radius: 8px; color: #fff; background: var(--coral); font-size: 11px; }
.objective p { margin: 0; font-size: 13px; line-height: 1.45; }

.teacher-note { display: grid; grid-template-columns: 48px 1fr; gap: 14px; padding: 18px; border-radius: 18px 18px 18px 6px; background: var(--gold-soft); }
.teacher-note span { display: grid; width: 48px; height: 48px; place-items: center; border-radius: 50%; color: #fff; background: var(--gold); font: 800 20px/1 "Songti SC", serif; }
.teacher-note strong { display: block; margin-bottom: 5px; color: #8d620e; font-size: 12px; }
.teacher-note p { margin: 0; color: #685934; font-size: 12px; line-height: 1.6; }

.panel-footer { display: flex; justify-content: flex-end; margin-top: 28px; }
.primary-button { min-height: 48px; padding: 0 20px; border-radius: 14px 14px 14px 5px; color: #fff; background: var(--coral); }
.primary-button:hover { background: var(--coral-dark); }
.primary-button.jade { background: var(--jade); }

.vocab-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 11px; }
.vocab-card { padding: 18px; border: 1px solid var(--line); border-radius: 18px; background: #fff; transition: border-color .18s ease, transform .18s ease; }
.vocab-card:hover { transform: translateY(-2px); border-color: #cdbfae; }
.vocab-top { display: grid; grid-template-columns: auto 1fr auto; gap: 13px; align-items: center; }
.vocab-hanzi { min-width: 55px; color: var(--coral-dark); font: 800 31px/1 "Songti SC", serif; }
.vocab-reading b, .vocab-reading span { display: block; }
.vocab-reading b { margin-bottom: 4px; color: var(--jade); font-size: 13px; }
.vocab-reading span { font-size: 12px; }
.audio-group { display: flex; gap: 5px; }
.audio-button { display: grid; width: 33px; height: 33px; place-items: center; border: 1px solid var(--line); border-radius: 10px; color: var(--jade); background: var(--paper); cursor: pointer; }
.audio-button:hover { border-color: var(--jade); background: var(--jade-soft); }
.audio-button.slow { color: var(--muted); font-size: 13px; }
.vocab-example { margin-top: 14px; padding-top: 12px; border-top: 1px solid #eee8df; }
.vocab-example b { display: block; margin-bottom: 4px; font-family: "Songti SC", serif; font-size: 14px; }
.vocab-example span, .vocab-example small { display: block; color: var(--muted); font-size: 10px; line-height: 1.5; }

.dialogue-toolbar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 21px; }
.dialogue-toolbar button, .voice-select { min-height: 39px; border: 1px solid var(--line); border-radius: 12px; color: var(--jade); background: #fff; font-size: 11px; font-weight: 800; cursor: pointer; }
.dialogue-toolbar button { padding: 0 13px; }
.voice-select { max-width: 270px; padding: 0 10px; }
.dialogue-toolbar .ai-voice-disclosure { width: 100%; }
.dialogue-lines { display: grid; gap: 12px; }
.dialogue-line { display: grid; grid-template-columns: 54px 1fr auto; gap: 14px; align-items: start; padding: 18px; border-radius: 18px; background: #fff; border: 1px solid var(--line); }
.dialogue-speaker { display: grid; width: 48px; height: 48px; place-items: center; border-radius: 15px 15px 15px 5px; color: #fff; background: var(--jade); font: 750 13px/1 "Songti SC", serif; }
.dialogue-line:nth-child(even) .dialogue-speaker { background: var(--coral); }
.dialogue-text b { display: block; margin-bottom: 5px; font: 750 20px/1.35 "Songti SC", serif; }
.dialogue-text span, .dialogue-text small { display: block; }
.dialogue-text span { margin-bottom: 4px; color: var(--jade); font-size: 12px; }
.dialogue-text small { color: var(--muted); font-size: 11px; }

.grammar-list { display: grid; gap: 17px; }
.grammar-card { padding: 23px; border: 1px solid var(--line); border-radius: 19px; background: #fff; }
.grammar-card h3 { margin-bottom: 11px; font-size: 19px; letter-spacing: -.025em; }
.formula { display: inline-block; margin-bottom: 14px; padding: 9px 12px; border-radius: 10px; color: var(--coral-dark); background: var(--coral-soft); font: 750 13px/1.3 "Songti SC", sans-serif; }
.grammar-card > p { color: var(--muted); font-size: 12px; line-height: 1.65; }
.example-table { display: grid; gap: 6px; margin: 14px 0; }
.example-row { display: grid; grid-template-columns: minmax(120px, .8fr) 1fr 1fr auto; gap: 10px; align-items: center; padding: 11px 12px; border-radius: 11px; background: #f8f5ef; }
.example-row b { font: 750 14px/1.3 "Songti SC", serif; }
.example-row span { color: var(--jade); font-size: 10px; }
.example-row small { color: var(--muted); font-size: 10px; }
.mistake-note { margin-top: 15px; padding: 13px; border-left: 3px solid var(--coral); color: #7c453d; background: #fff5f1; font-size: 11px; line-height: 1.55; }
.mistake-note strong { margin-right: 4px; }

.quiz-shell { display: grid; grid-template-columns: minmax(0, 1fr) 210px; gap: 22px; }
.quiz-main { min-width: 0; }
.quiz-progress { display: flex; gap: 6px; margin-bottom: 27px; }
.quiz-progress span { height: 7px; flex: 1; border-radius: 9px; background: #e7dfd3; }
.quiz-progress span.current, .quiz-progress span.done { background: var(--jade); }
.quiz-progress span.wrong { background: var(--coral); }
.quiz-question-label { color: var(--muted); font-size: 10px; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; }
.quiz-question { margin: 8px 0 23px; font-size: clamp(22px, 3vw, 30px); line-height: 1.3; letter-spacing: -.03em; }
.choice-list { display: grid; gap: 9px; }
.quiz-listen-button { display: grid; width: min(330px, 100%); grid-template-columns: 43px 1fr; gap: 1px 10px; align-items: center; margin: -4px 0 17px; padding: 11px 15px; border: 1px solid #b8d6cc; border-radius: 15px; color: var(--jade); background: var(--jade-soft); text-align: left; cursor: pointer; }
.quiz-listen-button > span { display: grid; width: 39px; height: 39px; grid-row: 1 / 3; place-items: center; border-radius: 50%; color: #fff; background: var(--jade); }
.quiz-listen-button b { align-self: end; font-size: 12px; }
.quiz-listen-button small { align-self: start; color: var(--muted); font-size: 9px; }
.choice-button { position: relative; min-height: 57px; padding: 13px 15px 13px 48px; border: 1px solid var(--line); border-radius: 15px; background: #fff; text-align: left; cursor: pointer; }
.choice-button::before { position: absolute; top: 50%; left: 14px; display: grid; width: 23px; height: 23px; place-items: center; border: 1px solid #d5cabd; border-radius: 7px; color: var(--muted); content: attr(data-index); transform: translateY(-50%); font-size: 9px; }
.choice-button:hover:not(:disabled) { border-color: #b9ab9a; }
.choice-button.correct { border-color: var(--jade); color: #0d6752; background: var(--jade-soft); }
.choice-button.wrong { border-color: var(--danger); color: #9c2938; background: #fde8ea; }

.arrange-zone { display: grid; gap: 17px; }
.arrange-answer { min-height: 64px; padding: 12px; border: 1px dashed #cfc3b3; border-radius: 15px; background: #faf7f1; }
.token-bank { display: flex; flex-wrap: wrap; gap: 8px; }
.word-token { padding: 10px 14px; border: 1px solid var(--line); border-radius: 11px; background: #fff; cursor: pointer; font-family: "Songti SC", sans-serif; }
.word-token.chosen { border-color: var(--jade); color: var(--jade); background: var(--jade-soft); }
.arrange-actions { display: flex; gap: 8px; }
.arrange-actions button { min-height: 39px; padding: 0 13px; border: 1px solid var(--line); border-radius: 11px; background: #fff; font-size: 11px; font-weight: 750; cursor: pointer; }

.input-answer { width: 100%; min-height: 56px; padding: 0 16px; border: 1px solid var(--line); border-radius: 14px; outline: none; background: #fff; font-size: 17px; }
.input-answer:focus { border-color: var(--jade); box-shadow: 0 0 0 4px rgba(22,126,105,.08); }
.input-hint { margin: 9px 0 0; color: var(--muted); font-size: 11px; }

.quiz-feedback { display: none; margin-top: 17px; padding: 16px; border-radius: 15px; background: var(--jade-soft); }
.quiz-feedback.visible { display: block; }
.quiz-feedback.bad { background: #fde8ea; }
.quiz-feedback strong { display: block; margin-bottom: 5px; color: var(--jade); }
.quiz-feedback.bad strong { color: var(--danger); }
.quiz-feedback p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.55; }
.quiz-action-row { display: flex; justify-content: flex-end; gap: 9px; margin-top: 18px; }

.quiz-aside { padding: 18px; border-radius: 18px; background: #f7f1e7; align-self: start; }
.quiz-aside .teacher-avatar { margin-bottom: 12px; }
.quiz-aside strong { display: block; margin-bottom: 6px; font-size: 12px; }
.quiz-aside p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.6; }
.quiz-score { margin-top: 16px; padding-top: 13px; border-top: 1px solid var(--line); }
.quiz-score b { display: block; font-size: 24px; }
.quiz-score small { color: var(--muted); font-size: 9px; text-transform: uppercase; }

.completion { padding: 42px 24px; text-align: center; }
.completion-seal { display: grid; width: 86px; height: 86px; place-items: center; margin: 0 auto 23px; border: 6px solid #f5d58e; border-radius: 50%; color: #fff; background: var(--gold); box-shadow: 0 0 0 7px var(--gold-soft); font: 800 31px/1 "Songti SC", serif; }
.completion h2 { font-size: 32px; }
.completion > p { max-width: 520px; margin: 0 auto 23px; color: var(--muted); line-height: 1.6; }
.completion-stats { display: flex; justify-content: center; gap: 10px; margin-bottom: 25px; }
.completion-stats span { min-width: 100px; padding: 13px; border: 1px solid var(--line); border-radius: 13px; background: #fff; }
.completion-stats b, .completion-stats small { display: block; }
.completion-stats small { margin-top: 3px; color: var(--muted); font-size: 9px; text-transform: uppercase; }

.tutor-fab {
  position: fixed;
  right: 24px;
  bottom: 22px;
  z-index: 35;
  display: flex;
  min-height: 52px;
  align-items: center;
  gap: 10px;
  padding: 0 17px 0 7px;
  border: 0;
  border-radius: 99px;
  color: #fff;
  background: #293a38;
  box-shadow: 0 13px 32px rgba(27,45,41,.26);
  cursor: pointer;
}

.tutor-fab > span { display: grid; width: 38px; height: 38px; place-items: center; border-radius: 50%; color: #254038; background: #80ceb7; font: 800 17px/1 "Songti SC", serif; }
.tutor-fab b { font-size: 12px; }
.tutor-fab i { width: 7px; height: 7px; border-radius: 50%; background: #b7b4ae; }
.tutor-fab.online i { background: #6ee0b9; }

.tutor-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 60;
  display: flex;
  width: min(420px, 100%);
  flex-direction: column;
  border-left: 1px solid var(--line);
  background: var(--paper);
  box-shadow: -20px 0 55px rgba(48,37,24,.15);
  transform: translateX(105%);
  transition: transform .26s ease;
}

.tutor-drawer.open { transform: translateX(0); }
.tutor-drawer > header { display: flex; align-items: center; justify-content: space-between; padding: 20px; border-bottom: 1px solid var(--line); }
.tutor-drawer > header > div { display: flex; align-items: center; gap: 11px; }
.tutor-drawer header strong, .tutor-drawer header small { display: block; }
.tutor-drawer header strong { font-size: 14px; }
.tutor-drawer header small { margin-top: 3px; color: var(--muted); font-size: 9px; }
.tutor-drawer header > button { border: 0; color: var(--muted); background: none; font-size: 27px; cursor: pointer; }
.tutor-context { padding: 10px 20px; color: var(--jade); background: var(--jade-soft); font-size: 10px; font-weight: 750; }

.tutor-unlock { margin: 18px; padding: 20px; border: 1px solid #c9ded7; border-radius: 18px; background: #f2faf7; }
.tutor-unlock > div { display: grid; grid-template-columns: 42px 1fr; column-gap: 11px; align-items: center; }
.unlock-icon { display: grid; grid-row: 1 / 3; width: 42px; height: 42px; place-items: center; border-radius: 13px 13px 13px 4px; color: #fff; background: var(--jade); font: 800 18px/1 "Songti SC", serif; }
.tutor-unlock strong { font-size: 14px; }
.tutor-unlock p { grid-column: 2; margin: 4px 0 14px; color: var(--muted); font-size: 10px; line-height: 1.55; }
.tutor-unlock label { display: block; margin: 13px 0 6px; color: var(--muted); font-size: 9px; font-weight: 800; text-transform: uppercase; }
.tutor-unlock input { width: 100%; min-height: 44px; padding: 0 12px; border: 1px solid var(--line); border-radius: 12px; outline: 0; background: #fff; font-size: 12px; }
.tutor-unlock input:focus { border-color: var(--jade); box-shadow: 0 0 0 3px rgba(22,126,105,.09); }
.tutor-unlock small { display: block; min-height: 17px; padding-top: 5px; color: var(--danger); font-size: 9px; }
.tutor-unlock button { width: 100%; min-height: 43px; border: 0; border-radius: 12px; color: #fff; background: var(--jade); font-size: 11px; font-weight: 800; cursor: pointer; }
.tutor-unlock button:disabled { opacity: .55; cursor: wait; }

.chat-messages { display: flex; min-height: 0; flex: 1; flex-direction: column; gap: 12px; padding: 20px; overflow-y: auto; }
.chat-message { max-width: 86%; padding: 12px 14px; border-radius: 15px; white-space: pre-wrap; font-size: 12px; line-height: 1.6; }
.chat-message.assistant { align-self: flex-start; border-radius: 15px 15px 15px 4px; background: #f0ebe3; }
.chat-message.user { align-self: flex-end; border-radius: 15px 15px 4px 15px; color: #fff; background: var(--jade); }
.chat-message.loading { color: var(--muted); font-style: italic; }

.chat-suggestions { display: flex; gap: 6px; padding: 0 16px 12px; overflow-x: auto; }
.chat-suggestions button { flex: 0 0 auto; padding: 7px 10px; border: 1px solid var(--line); border-radius: 99px; color: var(--muted); background: #fff; font-size: 9px; cursor: pointer; }
.chat-form { display: grid; grid-template-columns: 1fr 44px; gap: 8px; padding: 14px 16px 18px; border-top: 1px solid var(--line); }
.chat-form textarea { min-height: 50px; max-height: 130px; padding: 11px 12px; border: 1px solid var(--line); border-radius: 13px; outline: 0; resize: vertical; background: #fff; font-size: 12px; }
.chat-form textarea:focus { border-color: var(--jade); }
.chat-form button { display: grid; width: 44px; height: 44px; place-items: center; align-self: end; border: 0; border-radius: 13px; color: #fff; background: var(--coral); cursor: pointer; }
.chat-form button:disabled { opacity: .5; cursor: wait; }

.drawer-backdrop { position: fixed; inset: 0; z-index: 55; visibility: hidden; background: rgba(29,26,22,.24); opacity: 0; transition: .25s ease; }
.drawer-backdrop.open { visibility: visible; opacity: 1; }

.install-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(29,26,22,.45);
  backdrop-filter: blur(5px);
}
.install-guide {
  position: relative;
  width: min(390px, 100%);
  padding: 30px 24px 24px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--paper);
  box-shadow: 0 24px 70px rgba(32,25,17,.24);
  text-align: center;
}
.install-close { position: absolute; top: 10px; right: 13px; border: 0; color: var(--muted); background: none; font-size: 26px; cursor: pointer; }
.install-seal { display: grid; width: 64px; height: 64px; place-items: center; margin: 0 auto 18px; border-radius: 20px 20px 20px 7px; color: #fff; background: var(--coral); box-shadow: 0 10px 24px rgba(217,93,79,.25); font: 800 31px/1 "Songti SC", serif; }
.install-guide h2 { margin-bottom: 10px; font-size: 24px; }
.install-guide p { margin-bottom: 20px; color: var(--muted); font-size: 13px; line-height: 1.65; }
.primary-install-close { min-height: 44px; padding: 0 20px; border: 0; border-radius: 13px; color: #fff; background: var(--jade); font-size: 12px; font-weight: 800; cursor: pointer; }

.toast { position: fixed; left: 50%; bottom: 23px; z-index: 80; padding: 12px 16px; border-radius: 12px; color: #fff; background: #25231f; box-shadow: 0 12px 30px rgba(0,0,0,.18); transform: translate(-50%, 15px); opacity: 0; pointer-events: none; transition: .23s ease; font-size: 11px; }
.toast.show { transform: translate(-50%, 0); opacity: 1; }

@media (max-width: 1030px) {
  :root { --sidebar: 220px; }
  .dashboard-grid { grid-template-columns: 1fr; }
  .level-summary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .study-method ol { grid-template-columns: repeat(5, 1fr); gap: 7px; }
  .study-method li { grid-template-columns: 1fr; text-align: center; }
  .study-method li > b { margin: 0 auto; }
  .course-map { grid-template-columns: 1fr; }
  .lexicon-grid { grid-template-columns: 1fr; }
}

@media (max-width: 820px) {
  .sidebar { z-index: 56; width: 256px; transform: translateX(-105%); box-shadow: 20px 0 45px rgba(34,29,23,.14); transition: transform .24s ease; }
  .sidebar.open { transform: translateX(0); }
  .main-area { margin-left: 0; }
  .mobile-menu { display: grid; }
  .breadcrumb { margin-right: auto; margin-left: 12px; }
  .welcome-row { grid-template-columns: 1fr; }
  .teacher-card { max-width: 620px; }
  .vocab-grid { grid-template-columns: 1fr; }
  .quiz-shell { grid-template-columns: 1fr; }
  .quiz-aside { display: grid; grid-template-columns: 42px 1fr auto; gap: 10px; align-items: center; }
  .quiz-aside .teacher-avatar { margin: 0; }
  .quiz-aside p { grid-column: 2; }
  .quiz-score { grid-row: 1 / 3; grid-column: 3; margin: 0; padding: 0 0 0 13px; border: 0; border-left: 1px solid var(--line); }
  .lexicon-toolbar { grid-template-columns: 1fr; }
  .lexicon-toolbar > div button { min-height: 34px; }
}

@media (max-width: 600px) {
  .topbar { height: 62px; padding: 0 12px; }
  .breadcrumb span, .daily-streak small { display: none; }
  .topbar-actions { gap: 7px; }
  .install-button { width: 40px; padding: 0; justify-content: center; }
  .install-button span { display: none; }
  .daily-streak { padding: 0 9px; }
  .page-view, .lesson-view { width: min(100% - 22px, 1180px); padding: 30px 0 76px; }
  .welcome-row h1, .page-heading h1 { font-size: 38px; }
  .metric-grid { grid-template-columns: 1fr; gap: 8px; }
  .lexicon-metrics { grid-template-columns: 1fr; }
  .metric-card { min-height: 72px; }
  .metric-icon { width: 42px; height: 42px; }
  .dashboard-grid { gap: 12px; }
  .continue-card { min-height: 330px; grid-template-columns: 1fr; }
  .continue-number { display: none; }
  .study-method ol { grid-template-columns: 1fr; }
  .study-method li { grid-template-columns: 29px 1fr; text-align: left; }
  .study-method li > b { margin: 0; }
  .section-heading { align-items: center; }
  .level-summary-grid { grid-template-columns: 1fr; }
  .level-summary-card > p { min-height: auto; }
  .level-filter { top: 66px; }
  .course-level-heading { align-items: start; flex-direction: column; gap: 6px; }
  .lesson-preview { grid-template-columns: 48px 1fr auto; gap: 10px; }
  .lesson-preview-icon { width: 46px; height: 46px; }
  .lesson-preview > small { display: none; }
  .course-card { padding: 22px; }
  .course-card-footer { right: 22px; left: 22px; }
  .lesson-hero { min-height: 290px; padding: 27px 23px; }
  .lesson-hero h1 { margin-top: 38px; font-size: 37px; }
  .lesson-tabs { top: 62px; display: flex; overflow-x: auto; }
  .lesson-tab { min-width: 105px; }
  .content-panel { padding: 23px 17px; }
  .panel-heading h2 { font-size: 26px; }
  .objectives-grid { grid-template-columns: 1fr; }
  .objective { min-height: auto; }
  .teacher-note { grid-template-columns: 40px 1fr; }
  .teacher-note span { width: 40px; height: 40px; }
  .vocab-top { grid-template-columns: 48px 1fr auto; }
  .vocab-hanzi { min-width: 45px; font-size: 27px; }
  .dialogue-line { grid-template-columns: 42px 1fr; padding: 15px; }
  .dialogue-speaker { width: 40px; height: 40px; font-size: 11px; }
  .dialogue-line > .audio-button { grid-column: 2; }
  .example-row { grid-template-columns: 1fr auto; }
  .example-row span, .example-row small { grid-column: 1; }
  .quiz-aside { grid-template-columns: 40px 1fr; }
  .quiz-score { grid-row: auto; grid-column: 1 / -1; padding: 12px 0 0; border-top: 1px solid var(--line); border-left: 0; }
  .review-item { grid-template-columns: 40px 1fr auto; padding: 15px; }
  .lexicon-result-line { align-items: start; flex-direction: column; gap: 4px; }
  .lexicon-card { grid-template-columns: 28px minmax(0, 1fr) 34px; }
  .lexicon-level { grid-row: 1; grid-column: 1; align-self: start; }
  .lexicon-index { display: none; }
  .lexicon-word { grid-column: 2; }
  .lexicon-audio { grid-column: 3; }
  .lexicon-known { grid-column: 2 / -1; }
  .tutor-fab { right: 14px; bottom: 14px; }
  .completion-stats { flex-direction: column; }
}

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

/* Nền tảng phát âm, chữ Hán và phòng luyện */
.foundation-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
  padding: 22px 26px;
  border: 1px solid #b9d7cc;
  border-radius: 23px;
  background: linear-gradient(135deg, #f8fffc, var(--jade-soft));
}
.foundation-progress h2 { margin: 7px 0 5px; font-size: 25px; }
.foundation-progress p { margin: 0; color: var(--muted); font-size: 12px; }
.foundation-progress-ring { display: grid; width: 88px; height: 88px; flex: 0 0 auto; place-items: center; border-radius: 50%; background: conic-gradient(var(--jade) var(--progress), #cfe2da 0); }
.foundation-progress-ring::before { grid-area: 1/1; width: 68px; height: 68px; border-radius: 50%; background: #f8fffc; content: ''; }
.foundation-progress-ring span { z-index: 1; grid-area: 1/1; text-align: center; }
.foundation-progress-ring b, .foundation-progress-ring small { display: block; }
.foundation-progress-ring b { font-size: 18px; }
.foundation-progress-ring small { color: var(--muted); font-size: 8px; }
.foundation-layout { display: grid; grid-template-columns: minmax(310px, .9fr) minmax(390px, 1.1fr); gap: 16px; align-items: start; }
.foundation-units { display: grid; gap: 8px; }
.foundation-unit { display: grid; grid-template-columns: 46px 1fr auto; gap: 12px; align-items: center; width: 100%; min-height: 87px; padding: 13px 15px; border: 1px solid var(--line); border-radius: 17px; background: rgba(255,253,248,.78); text-align: left; cursor: pointer; transition: .18s ease; }
.foundation-unit:hover, .foundation-unit.active { border-color: #9dcabb; background: #f6fcf9; transform: translateX(2px); }
.foundation-unit > span { display: grid; width: 44px; height: 44px; place-items: center; border-radius: 13px; color: var(--jade); background: var(--jade-soft); font: 800 20px/1 "Songti SC", serif; }
.foundation-unit.done > span { color: #fff; background: var(--jade); font-family: inherit; }
.foundation-unit small, .foundation-unit strong, .foundation-unit p { display: block; }
.foundation-unit small { margin-bottom: 3px; color: var(--coral-dark); font-size: 8px; font-weight: 850; text-transform: uppercase; letter-spacing: .08em; }
.foundation-unit strong { font-size: 13px; }
.foundation-unit p { margin: 4px 0 0; color: var(--muted); font-size: 10px; line-height: 1.4; }
.foundation-unit i { color: #a8a096; font-style: normal; }
.foundation-guide { position: sticky; top: 88px; min-height: 510px; padding: 30px; border: 1px solid var(--line); border-radius: 24px; background: var(--paper); box-shadow: var(--shadow); }
.foundation-guide-icon { display: grid; width: 58px; height: 58px; margin-bottom: 22px; place-items: center; border-radius: 18px; color: #fff; background: var(--coral); font: 800 27px/1 "Songti SC", serif; }
.foundation-guide h2 { margin: 8px 0 7px; font-size: 29px; }
.foundation-guide > p { color: var(--muted); line-height: 1.55; }
.foundation-guide ul { display: grid; gap: 10px; margin: 20px 0; padding: 0; list-style: none; }
.foundation-guide li { display: grid; grid-template-columns: 22px 1fr; gap: 8px; align-items: start; font-size: 12px; line-height: 1.5; }
.foundation-guide li span { display: grid; width: 20px; height: 20px; place-items: center; border-radius: 50%; color: var(--jade); background: var(--jade-soft); font-size: 9px; }
.foundation-example { position: relative; display: grid; padding: 18px; border-radius: 17px; background: #f5f0e7; }
.foundation-example b { font: 800 26px/1.3 "Songti SC", serif; }
.foundation-example span { margin: 5px 0; color: var(--jade); font-size: 12px; }
.foundation-example small { color: var(--muted); }
.foundation-example button { position: absolute; top: 14px; right: 14px; padding: 7px 9px; border: 0; border-radius: 9px; color: var(--jade); background: var(--jade-soft); font-size: 9px; font-weight: 800; cursor: pointer; }
.foundation-complete { width: 100%; margin-top: 15px; }
.foundation-complete.completed { color: var(--jade); background: var(--jade-soft); }
.practice-lab-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 34px; }
.practice-lab { min-width: 0; padding: 26px; border: 1px solid var(--line); border-radius: 24px; background: var(--paper); }
.practice-lab h2 { margin: 8px 0 7px; font-size: 24px; }
.practice-lab > p { min-height: 62px; color: var(--muted); font-size: 11px; line-height: 1.55; }
.pronunciation-targets, .writing-characters { display: flex; gap: 6px; margin: 17px 0; overflow-x: auto; padding-bottom: 3px; }
.pronunciation-targets button { display: grid; min-width: 61px; padding: 9px 8px; border: 1px solid var(--line); border-radius: 12px; background: #fff; cursor: pointer; }
.pronunciation-targets button.active { border-color: var(--jade); color: var(--jade); background: var(--jade-soft); }
.pronunciation-targets b { font: 800 20px/1.1 "Songti SC", serif; }
.pronunciation-targets span { margin-top: 4px; font-size: 8px; }
.pronunciation-focus { display: flex; min-height: 112px; align-items: center; justify-content: space-between; gap: 14px; padding: 17px; border-radius: 18px; background: linear-gradient(135deg, var(--coral-soft), #fff7f3); }
.pronunciation-focus div { display: grid; }
.pronunciation-focus b { font: 800 38px/1.1 "Songti SC", serif; }
.pronunciation-focus span { margin-top: 5px; color: var(--coral-dark); font-size: 12px; }
.pronunciation-focus small { margin-top: 3px; color: var(--muted); }
.pronunciation-focus button { padding: 9px 11px; border: 0; border-radius: 11px; color: var(--coral-dark); background: #fff; font-size: 9px; font-weight: 850; cursor: pointer; }
.recording-actions { display: flex; gap: 8px; margin-top: 12px; }
.recording-actions button { flex: 1; }
.record-button { min-height: 42px; border: 0; border-radius: 11px; color: #fff; background: var(--coral); font-size: 11px; font-weight: 850; cursor: pointer; }
.record-button.recording { animation: record-pulse 1s infinite alternate; }
@keyframes record-pulse { to { box-shadow: 0 0 0 6px rgba(217,93,79,.15); } }
.pronunciation-result { display: flex; min-height: 58px; gap: 12px; align-items: center; margin-top: 10px; padding: 11px 13px; border: 1px dashed #d8cec1; border-radius: 13px; }
.pronunciation-result audio { width: min(230px, 100%); height: 34px; }
.pronunciation-result strong, .pronunciation-result small { display: block; }
.pronunciation-result strong { font-size: 11px; }
.pronunciation-result small { color: var(--muted); font-size: 9px; line-height: 1.4; }
.recognition-score { display: flex; align-items: baseline; color: var(--jade); }
.recognition-score b { font-size: 25px; }
.recognition-score span { font-size: 9px; }
.writing-characters button { display: grid; min-width: 38px; height: 38px; place-items: center; border: 1px solid var(--line); border-radius: 10px; background: #fff; font: 800 19px/1 "Songti SC", serif; cursor: pointer; }
.writing-characters button.active { border-color: var(--jade); color: #fff; background: var(--jade); }
.writing-canvas-wrap { position: relative; width: min(100%, 330px); margin: 0 auto; aspect-ratio: 1; border: 2px solid #cdbfae; border-radius: 14px; overflow: hidden; background: linear-gradient(45deg, transparent 49.7%, #e7dfd4 50%, transparent 50.3%), linear-gradient(-45deg, transparent 49.7%, #e7dfd4 50%, transparent 50.3%), linear-gradient(90deg, transparent 49.7%, #e7dfd4 50%, transparent 50.3%), linear-gradient(0deg, transparent 49.7%, #e7dfd4 50%, transparent 50.3%), #fff; }
.writing-canvas-wrap > span { position: absolute; inset: 0; display: grid; place-items: center; color: rgba(217,93,79,.12); font: 800 clamp(150px, 23vw, 240px)/1 "Kaiti SC", "Songti SC", serif; pointer-events: none; }
.writing-canvas-wrap canvas { position: absolute; inset: 0; width: 100%; height: 100%; cursor: crosshair; touch-action: none; }
.writing-actions { display: flex; gap: 8px; justify-content: center; margin-top: 13px; }
.hsk3-bridge { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-top: 16px; padding: 29px; border-radius: 24px; color: #fff; background: linear-gradient(135deg, #1a6558, #123d43); }
.hsk3-bridge h2 { margin: 8px 0; font-size: 25px; }
.hsk3-bridge p { max-width: 760px; margin-bottom: 15px; color: rgba(255,255,255,.73); font-size: 12px; line-height: 1.6; }
.hsk3-bridge .section-overline { color: #ffc983; }
.hsk3-bridge > a { flex: 0 0 auto; padding: 11px 14px; border: 1px solid rgba(255,255,255,.3); border-radius: 12px; color: #fff; font-size: 10px; font-weight: 800; text-decoration: none; }
.bridge-tags { display: flex; gap: 7px; flex-wrap: wrap; }
.bridge-tags span { padding: 6px 9px; border-radius: 9px; background: rgba(255,255,255,.1); font-size: 9px; }

/* Ôn tập ngắt quãng, báo cáo tuần và sao lưu */
.review-content { display: grid; gap: 18px; }
.weekly-report { display: grid; grid-template-columns: 1fr auto; gap: 24px; padding: 26px; border-radius: 23px; color: #fff; background: linear-gradient(135deg, #a9433a, var(--coral)); }
.weekly-report .section-overline { color: #ffe1b6; }
.weekly-report h2 { margin: 8px 0 6px; }
.weekly-report p { max-width: 640px; margin: 0; color: rgba(255,255,255,.78); font-size: 11px; line-height: 1.55; }
.weekly-metrics { display: grid; grid-template-columns: repeat(4, minmax(60px, 1fr)); gap: 8px; }
.weekly-metrics span { display: grid; min-width: 76px; place-items: center; padding: 10px; border-radius: 13px; background: rgba(255,255,255,.13); text-align: center; }
.weekly-metrics b { font-size: 22px; }
.weekly-metrics small { color: rgba(255,255,255,.76); font-size: 8px; }
.review-section { padding: 23px; border: 1px solid var(--line); border-radius: 22px; background: rgba(255,253,248,.78); }
.review-section-heading { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 16px; }
.review-section-heading h2 { margin: 6px 0 0; font-size: 21px; }
.review-section-heading > span { padding: 6px 9px; border-radius: 9px; color: var(--jade); background: var(--jade-soft); font-size: 9px; font-weight: 850; }
.review-empty-compact { display: grid; grid-template-columns: 42px 1fr; gap: 12px; align-items: center; padding: 18px; border: 1px dashed #d4c9ba; border-radius: 15px; }
.review-empty-compact > span { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 12px; color: var(--jade); background: var(--jade-soft); font: 800 18px/1 "Songti SC", serif; }
.review-empty-compact strong, .review-empty-compact small { display: block; }
.review-empty-compact strong { font-size: 12px; }
.review-empty-compact small { margin-top: 4px; color: var(--muted); font-size: 9px; }
.srs-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.srs-card { position: relative; display: grid; min-height: 280px; place-items: center; align-content: center; padding: 18px; border: 1px solid var(--line); border-radius: 17px; background: #fff; text-align: center; overflow: hidden; }
.srs-card > .lexicon-level { position: absolute; top: 12px; left: 12px; }
.srs-card > b { font: 800 44px/1.1 "Songti SC", serif; }
.srs-card > small { position: absolute; right: 12px; bottom: 9px; color: var(--muted); font-size: 8px; }
.srs-answer { min-height: 73px; margin: 8px 0; filter: blur(8px); opacity: .35; pointer-events: none; user-select: none; transition: .2s ease; }
.srs-card.revealed .srs-answer { filter: none; opacity: 1; pointer-events: auto; user-select: auto; }
.srs-answer span { color: var(--jade); font-size: 12px; }
.srs-answer p { margin: 5px 0; color: var(--muted); font-size: 9px; line-height: 1.4; }
.srs-answer button { border: 0; color: var(--jade); background: none; font-size: 9px; cursor: pointer; }
.srs-reveal { padding: 8px 12px; border: 0; border-radius: 9px; color: #fff; background: var(--jade); font-size: 9px; font-weight: 850; cursor: pointer; }
.srs-actions { display: none; gap: 5px; width: 100%; }
.srs-card.revealed .srs-actions { display: grid; grid-template-columns: repeat(3, 1fr); }
.srs-actions button { min-height: 32px; padding: 5px; border: 1px solid var(--line); border-radius: 8px; background: #fff; font-size: 8px; font-weight: 800; cursor: pointer; }
.srs-actions button:first-child { color: var(--danger); }
.srs-actions button:last-child { color: var(--jade); background: var(--jade-soft); }
.backup-panel { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 24px; border: 1px solid var(--line); border-radius: 22px; background: var(--blue-soft); }
.backup-panel h2 { margin: 7px 0 5px; font-size: 20px; }
.backup-panel p { max-width: 620px; margin: 0; color: var(--muted); font-size: 10px; }
.backup-panel > div:last-child { display: flex; flex: 0 0 auto; gap: 8px; }

@media (max-width: 1030px) {
  .foundation-layout { grid-template-columns: 1fr; }
  .foundation-guide { position: static; min-height: 0; }
  .practice-lab-grid { grid-template-columns: 1fr; }
  .practice-lab > p { min-height: 0; }
  .srs-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .weekly-report { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .foundation-progress { padding: 18px; }
  .foundation-progress-ring { width: 76px; height: 76px; }
  .foundation-progress-ring::before { width: 58px; height: 58px; }
  .foundation-progress p { display: none; }
  .foundation-unit { grid-template-columns: 42px 1fr auto; padding: 12px; }
  .foundation-guide, .practice-lab { padding: 20px 16px; }
  .foundation-guide h2 { font-size: 25px; }
  .practice-lab-grid { margin-top: 20px; }
  .pronunciation-result { align-items: stretch; flex-direction: column; }
  .pronunciation-result audio { width: 100%; }
  .recording-actions, .writing-actions { flex-direction: column; }
  .hsk3-bridge { align-items: flex-start; flex-direction: column; padding: 22px 18px; }
  .weekly-report { padding: 21px 17px; }
  .weekly-metrics { grid-template-columns: repeat(2, 1fr); }
  .review-section { padding: 18px 13px; }
  .srs-grid { grid-template-columns: 1fr; }
  .backup-panel { align-items: stretch; flex-direction: column; }
  .backup-panel > div:last-child { flex-direction: column; }
}

/* Trải nghiệm học hoàn chỉnh: kế hoạch ngày, bài kiểm tra và điều hướng điện thoại */
.daily-plan {
  margin: 20px 0;
  padding: 25px;
  border: 1px solid #bed7ce;
  border-radius: 25px;
  background: linear-gradient(145deg, rgba(255,255,255,.88), #edf8f4);
  box-shadow: 0 16px 42px rgba(22,126,105,.07);
}
.daily-plan-head { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 18px; }
.daily-plan-head h2 { margin: 6px 0; font-size: 28px; letter-spacing: -.035em; }
.daily-plan-head p { max-width: 690px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.55; }
.daily-plan-score { display: grid; min-width: 88px; min-height: 70px; place-items: center; align-content: center; border-radius: 18px; color: #fff; background: var(--jade); }
.daily-plan-score b { font-size: 24px; }
.daily-plan-score small { margin-top: 2px; font-size: 11px; opacity: .82; }
.daily-task-list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 9px; }
.daily-task { display: grid; grid-template-columns: 38px minmax(0,1fr); gap: 10px; min-height: 130px; padding: 15px; border: 1px solid var(--line); border-radius: 17px; background: #fff; text-align: left; cursor: pointer; transition: .18s ease; }
.daily-task:hover { border-color: #9fc9bb; transform: translateY(-2px); box-shadow: 0 8px 22px rgba(47,70,64,.07); }
.daily-task > span { display: grid; width: 36px; height: 36px; place-items: center; border-radius: 11px; color: var(--jade); background: var(--jade-soft); font: 800 18px/1 "Songti SC", serif; }
.daily-task > div { min-width: 0; }
.daily-task small, .daily-task b, .daily-task p { display: block; }
.daily-task small { color: var(--coral-dark); font-size: 11px; font-weight: 800; }
.daily-task b { margin-top: 5px; font-size: 13px; line-height: 1.35; }
.daily-task p { margin: 5px 0 0; color: var(--muted); font-size: 11px; line-height: 1.4; }
.daily-task i { grid-column: 1 / -1; align-self: end; color: var(--jade); font-size: 11px; font-style: normal; font-weight: 800; }
.daily-task.done { border-color: #cae0d8; background: #f7fbf9; }
.daily-task.done > span { color: #fff; background: var(--jade); font-family: inherit; }
.daily-ai-button { width: 100%; min-height: 44px; margin-top: 10px; border: 1px dashed #8ebdad; border-radius: 13px; color: var(--jade); background: rgba(255,255,255,.62); font-size: 12px; font-weight: 800; cursor: pointer; }

.foundation-shortcuts { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px; margin-bottom: 18px; }
.foundation-shortcuts button { display: grid; grid-template-columns: 48px 1fr auto; gap: 12px; align-items: center; min-height: 72px; padding: 12px 15px; border: 1px solid var(--line); border-radius: 17px; background: var(--paper); text-align: left; cursor: pointer; }
.foundation-shortcuts button:hover { border-color: var(--jade); }
.foundation-shortcuts span { display: grid; width: 46px; height: 46px; place-items: center; border-radius: 14px; color: #fff; background: var(--coral); font: 800 22px/1 "Songti SC", serif; }
.foundation-shortcuts b, .foundation-shortcuts small { display: block; }
.foundation-shortcuts b { font-size: 14px; }
.foundation-shortcuts small { margin-top: 4px; color: var(--muted); font-size: 11px; }
.foundation-shortcuts i { color: var(--jade); font-style: normal; }

.foundation-check { margin-top: 18px; padding: 18px; border: 1px solid #d5cdc1; border-radius: 17px; background: #fff; }
.foundation-check-head { display: flex; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 11px; }
.foundation-check-head b { color: var(--jade); }
.foundation-check h3 { margin: 12px 0; font-size: 17px; line-height: 1.4; }
.foundation-check-audio { min-height: 38px; margin-bottom: 10px; padding: 0 12px; border: 0; border-radius: 10px; color: var(--jade); background: var(--jade-soft); font-size: 11px; font-weight: 800; cursor: pointer; }
.foundation-check-options { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 7px; }
.foundation-check-options button { min-height: 42px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 10px; background: #fff; font-size: 12px; text-align: left; cursor: pointer; }
.foundation-check-options button:hover:not(:disabled) { border-color: var(--jade); }
.foundation-check-options button.correct { border-color: var(--jade); color: #0d6752; background: var(--jade-soft); }
.foundation-check-options button.wrong { border-color: var(--danger); color: #9c2938; background: #fde8ea; }
.foundation-check-feedback { margin-top: 10px; padding: 12px; border-radius: 11px; background: var(--jade-soft); }
.foundation-check-feedback.wrong { background: #fde8ea; }
.foundation-check-feedback strong { color: var(--jade); font-size: 12px; }
.foundation-check-feedback.wrong strong { color: var(--danger); }
.foundation-check-feedback p { margin: 5px 0 9px; color: var(--muted); font-size: 12px; line-height: 1.5; }
.foundation-check-feedback button { min-height: 34px; padding: 0 10px; border: 0; border-radius: 9px; color: #fff; background: var(--jade); font-size: 11px; font-weight: 800; cursor: pointer; }
.foundation-complete:disabled { opacity: .56; cursor: not-allowed; }

.voice-control { display: grid; grid-template-columns: auto minmax(0,1fr) auto; gap: 8px; align-items: center; margin: 15px 0 2px; padding: 10px; border-radius: 13px; background: #f6f1e9; }
.voice-control label { font-size: 11px; font-weight: 800; }
.voice-control select, .voice-control button { min-width: 0; min-height: 38px; border: 1px solid var(--line); border-radius: 10px; background: #fff; font-size: 11px; }
.voice-control select { padding: 0 9px; }
.voice-control button { padding: 0 10px; color: var(--jade); font-weight: 800; cursor: pointer; }
.ai-voice-disclosure { color: var(--muted); font-size: 10px; line-height: 1.45; }
.voice-control .ai-voice-disclosure { grid-column: 1 / -1; }
.pitch-analysis { display: grid; width: 100%; grid-template-columns: auto minmax(0,1fr); gap: 12px; align-items: center; }
.pitch-contour { display: flex; height: 34px; align-items: end; gap: 3px; margin-top: 7px; padding: 4px; border-radius: 8px; background: #eef6f3; }
.pitch-contour i { min-width: 4px; flex: 1; border-radius: 4px 4px 1px 1px; background: var(--jade); }

.character-study-head { display: flex; align-items: center; justify-content: space-between; gap: 15px; padding: 14px 16px; border-radius: 16px; background: var(--coral-soft); }
.character-study-head > div { display: grid; grid-template-columns: auto 1fr; gap: 1px 10px; align-items: center; }
.character-study-head > div b { grid-row: 1 / 3; color: var(--coral-dark); font: 800 44px/1 "Songti SC", serif; }
.character-study-head > div span { color: var(--coral-dark); font-size: 13px; font-weight: 800; }
.character-study-head > div small { color: var(--muted); font-size: 11px; }
.character-study-head ul { display: flex; gap: 7px; margin: 0; padding: 0; list-style: none; }
.character-study-head li { padding: 7px 9px; border-radius: 9px; background: rgba(255,255,255,.68); font-size: 11px; }
.character-memory-hint { min-height: auto !important; margin: 10px 0 !important; padding: 10px 12px; border-left: 3px solid var(--gold); color: #665532 !important; background: var(--gold-soft); font-size: 12px !important; }
.writing-mode-tabs { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 5px; margin: 12px 0; padding: 5px; border-radius: 12px; background: #eee7dd; }
.writing-mode-tabs button { min-height: 38px; padding: 6px; border: 0; border-radius: 9px; color: var(--muted); background: transparent; font-size: 10px; font-weight: 800; cursor: pointer; }
.writing-mode-tabs button.active { color: #fff; background: var(--jade); }
.hanzi-writer-shell { display: grid; grid-template-columns: minmax(250px,340px) 1fr; gap: 13px; align-items: center; }
#hanziWriterTarget { display: grid; width: min(100%,340px); aspect-ratio: 1; place-items: center; margin: 0 auto; border: 2px solid #cdbfae; border-radius: 15px; background: linear-gradient(45deg, transparent 49.8%, #e7dfd4 50%, transparent 50.2%), linear-gradient(-45deg, transparent 49.8%, #e7dfd4 50%, transparent 50.2%), linear-gradient(90deg, transparent 49.8%, #e7dfd4 50%, transparent 50.2%), linear-gradient(0deg, transparent 49.8%, #e7dfd4 50%, transparent 50.2%), #fff; overflow: hidden; touch-action: none; }
#hanziWriterTarget svg { width: 100%; height: 100%; }
.hanzi-fallback { color: rgba(217,93,79,.2); font: 800 180px/1 "Kaiti SC", "Songti SC", serif; }
.hanzi-writer-status { padding: 14px; border: 1px dashed #cfc3b3; border-radius: 13px; color: var(--muted); background: #faf7f1; font-size: 12px; line-height: 1.55; }
.hanzi-writer-status strong { color: var(--jade); }

.speaking-mission { display: grid; max-width: 620px; margin: 0 auto 24px; padding: 21px; border: 1px solid #bdd8cf; border-radius: 19px; background: #f3fbf8; text-align: left; }
.speaking-mission h3 { margin: 6px 0 13px; font-size: 18px; }
.speaking-mission > b { color: var(--jade); font: 800 24px/1.35 "Songti SC", serif; }
.speaking-mission > span:not(.section-overline) { margin-top: 5px; color: var(--jade); font-size: 13px; }
.speaking-mission > small { margin-top: 4px; color: var(--muted); font-size: 12px; }
.speaking-mission > div { display: flex; gap: 8px; margin-top: 15px; }

.tutor-header-actions { display: flex; gap: 5px; }
.tutor-header-actions button { display: grid; width: 38px; height: 38px; place-items: center; border: 0; border-radius: 11px; color: var(--muted); background: #f3eee6; font-size: 21px; cursor: pointer; }
.tutor-header-actions button:hover { color: var(--jade); background: var(--jade-soft); }
.review-empty-compact button { margin-top: 8px; padding: 0; border: 0; color: var(--jade); background: none; font-size: 11px; font-weight: 800; cursor: pointer; }
.mobile-bottom-nav { display: none; }

/* Cỡ chữ nội dung chính được giữ ở mức dễ đọc trên điện thoại */
.section-overline, .kicker { font-size: 11px; }
.foundation-unit small, .foundation-unit p, .foundation-example button,
.practice-lab > p, .pronunciation-targets span, .pronunciation-focus button,
.pronunciation-result small, .hsk3-bridge > a, .bridge-tags span,
.weekly-report p, .weekly-metrics small, .review-section-heading > span,
.review-empty-compact small, .srs-answer p, .srs-answer button, .srs-reveal,
.srs-actions button, .backup-panel p { font-size: 11px; }
.foundation-progress-ring small, .srs-card > small { font-size: 10px; }
.foundation-unit strong, .foundation-guide li, .pronunciation-result strong,
.review-empty-compact strong { font-size: 12px; }

@media (max-width: 1100px) {
  .daily-task-list { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .weekly-metrics { grid-template-columns: repeat(3, minmax(76px,1fr)); }
}

@media (max-width: 820px) {
  .main-area { padding-bottom: calc(67px + env(safe-area-inset-bottom)); }
  .mobile-bottom-nav { position: fixed; right: 0; bottom: 0; left: 0; z-index: 45; display: grid; grid-template-columns: repeat(5,1fr); padding: 6px 5px calc(6px + env(safe-area-inset-bottom)); border-top: 1px solid var(--line); background: rgba(255,253,248,.96); box-shadow: 0 -8px 28px rgba(52,41,26,.08); backdrop-filter: blur(18px); }
  .mobile-bottom-nav button { display: grid; min-width: 0; min-height: 48px; place-items: center; align-content: center; gap: 3px; border: 0; border-radius: 11px; color: var(--muted); background: none; cursor: pointer; }
  .mobile-bottom-nav button.active { color: var(--jade); background: var(--jade-soft); }
  .mobile-bottom-nav span { font: 800 18px/1 "Songti SC", serif; }
  .mobile-bottom-nav small { font-size: 10px; font-weight: 800; white-space: nowrap; }
  .tutor-fab { bottom: calc(78px + env(safe-area-inset-bottom)); }
  .toast { bottom: calc(78px + env(safe-area-inset-bottom)); }
}

@media (max-width: 600px) {
  .page-view, .lesson-view { padding-bottom: 28px; }
  .daily-plan { padding: 18px 14px; }
  .daily-plan-head { align-items: flex-start; }
  .daily-plan-head h2 { font-size: 24px; }
  .daily-plan-score { min-width: 68px; min-height: 61px; }
  .daily-task-list { grid-template-columns: 1fr; }
  .daily-task { grid-template-columns: 39px 1fr auto; min-height: 84px; }
  .daily-task i { grid-row: 1; grid-column: 3; align-self: center; white-space: nowrap; }
  .foundation-shortcuts { grid-template-columns: 1fr; }
  .foundation-check-options { grid-template-columns: 1fr; }
  .voice-control { grid-template-columns: 1fr auto; }
  .voice-control label { grid-column: 1 / -1; }
  .character-study-head { align-items: flex-start; flex-direction: column; }
  .character-study-head ul { flex-wrap: wrap; }
  .writing-mode-tabs { grid-template-columns: 1fr; }
  .hanzi-writer-shell { grid-template-columns: 1fr; }
  .speaking-mission > div { flex-direction: column; }
  .weekly-metrics { grid-template-columns: repeat(2,1fr); }
  .tutor-drawer { padding-bottom: env(safe-area-inset-bottom); }
  .tutor-fab { min-width: 52px; padding-right: 7px; }
  .tutor-fab b { display: none; }
}

/* Trung tâm Nghe · Nói · Đọc · Viết */
.skills-snapshot { margin: 20px 0; padding: 23px; border: 1px solid var(--line); border-radius: 24px; background: rgba(255,253,248,.82); }
.skills-snapshot-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 15px; }
.skills-snapshot-head h2 { margin: 5px 0; font-size: 25px; }
.skills-snapshot-head p { margin: 0; color: var(--muted); font-size: 12px; }
.skills-snapshot-head > button { border: 0; color: var(--jade); background: none; font-size: 11px; font-weight: 800; cursor: pointer; }
.skills-snapshot-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 9px; }
.skill-snapshot-card { display: grid; grid-template-columns: 40px minmax(0,1fr) auto; gap: 10px; align-items: center; min-height: 74px; padding: 12px; border: 1px solid var(--line); border-radius: 15px; background: #fff; text-align: left; cursor: pointer; transition: .18s ease; }
.skill-snapshot-card:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(45,37,28,.07); }
.skill-snapshot-card > span { display: grid; width: 39px; height: 39px; place-items: center; border-radius: 12px; color: #fff; font: 800 19px/1 "Songti SC",serif; }
.skill-snapshot-card.jade > span { background: var(--jade); }
.skill-snapshot-card.coral > span { background: var(--coral); }
.skill-snapshot-card.gold > span { background: var(--gold); }
.skill-snapshot-card.blue > span { background: var(--blue); }
.skill-snapshot-card b, .skill-snapshot-card small { display: block; }
.skill-snapshot-card b { font-size: 13px; }
.skill-snapshot-card small { margin-top: 4px; color: var(--muted); font-size: 10px; line-height: 1.35; }
.skill-snapshot-card i { color: var(--muted); font-style: normal; }

.skills-content { display: grid; gap: 16px; }
.skill-overview-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 10px; }
.skill-overview-card { display: grid; grid-template-columns: 50px minmax(0,1fr); gap: 12px; align-items: center; min-height: 104px; padding: 15px; border: 1px solid var(--line); border-radius: 19px; background: var(--paper); text-align: left; cursor: pointer; transition: .18s ease; }
.skill-overview-card:hover, .skill-overview-card.active { transform: translateY(-2px); box-shadow: var(--shadow); }
.skill-overview-card.active.jade { border-color: var(--jade); }
.skill-overview-card.active.coral { border-color: var(--coral); }
.skill-overview-card.active.gold { border-color: var(--gold); }
.skill-overview-card.active.blue { border-color: var(--blue); }
.skill-overview-card > span { display: grid; width: 48px; height: 48px; place-items: center; border-radius: 15px; color: #fff; font: 800 23px/1 "Songti SC",serif; }
.skill-overview-card.jade > span { background: var(--jade); }
.skill-overview-card.coral > span { background: var(--coral); }
.skill-overview-card.gold > span { background: var(--gold); }
.skill-overview-card.blue > span { background: var(--blue); }
.skill-overview-card strong, .skill-overview-card small { display: block; }
.skill-overview-card strong { font-size: 14px; }
.skill-overview-card small { margin-top: 3px; color: var(--muted); font-size: 10px; }
.skill-overview-card p { grid-column: 1 / -1; margin: 7px 0 0; color: var(--muted); font-size: 10px; }

.skill-workspace { padding: clamp(18px,3vw,32px); border: 1px solid var(--line); border-radius: 25px; background: rgba(255,253,248,.9); box-shadow: var(--shadow); }
.skill-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.skill-level-filter { display: flex; gap: 6px; flex-wrap: wrap; }
.skill-level-filter button { min-height: 36px; padding: 0 12px; border: 1px solid var(--line); border-radius: 10px; color: var(--muted); background: #fff; font-size: 10px; font-weight: 800; cursor: pointer; }
.skill-level-filter button.active { border-color: var(--jade); color: #fff; background: var(--jade); }
.skill-total { display: grid; min-width: 90px; text-align: right; }
.skill-total b { color: var(--jade); font-size: 19px; }
.skill-total small { color: var(--muted); font-size: 10px; }
.skill-position { display: flex; justify-content: space-between; gap: 12px; margin: 18px 0 10px; color: var(--muted); font-size: 11px; font-weight: 800; }
.skill-position b { color: var(--jade); }
.skill-exercise { max-width: 850px; margin: 0 auto; }
.skill-exercise-head { display: flex; align-items: start; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.skill-exercise-head h2 { margin: 6px 0 0; font-size: 27px; }
.skill-prior { flex: 0 0 auto; padding: 7px 10px; border-radius: 10px; color: var(--coral-dark); background: var(--coral-soft); font-size: 10px; font-weight: 800; }
.skill-prior.passed { color: var(--jade); background: var(--jade-soft); }
.skill-exercise > h3 { margin: 22px 0 13px; font-size: 18px; line-height: 1.45; }

.blind-listening { display: grid; grid-template-columns: 58px 1fr auto auto; gap: 10px; align-items: center; padding: 20px; border-radius: 19px; color: #fff; background: linear-gradient(135deg,#126f5c,#12494b); }
.blind-listening > span { display: grid; width: 56px; height: 56px; place-items: center; border-radius: 17px; color: #174e45; background: #a1dfca; font: 800 27px/1 "Songti SC",serif; }
.blind-listening strong, .blind-listening small { display: block; }
.blind-listening strong { font-size: 14px; }
.blind-listening small { margin-top: 5px; color: rgba(255,255,255,.72); font-size: 11px; }
.blind-listening button { min-height: 42px; padding: 0 12px; border: 1px solid rgba(255,255,255,.25); border-radius: 11px; color: #fff; background: rgba(255,255,255,.1); font-size: 10px; font-weight: 800; cursor: pointer; }
.blind-listening button:hover { background: rgba(255,255,255,.18); }

.skill-choice-list { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px; }
.skill-choice-list button { display: grid; grid-template-columns: 27px 1fr; gap: 10px; align-items: center; min-height: 58px; padding: 11px 13px; border: 1px solid var(--line); border-radius: 14px; background: #fff; font-size: 12px; line-height: 1.4; text-align: left; cursor: pointer; }
.skill-choice-list button > span { display: grid; width: 26px; height: 26px; place-items: center; border: 1px solid var(--line); border-radius: 8px; color: var(--muted); font-size: 10px; font-weight: 800; }
.skill-choice-list button:hover:not(:disabled) { border-color: var(--jade); }
.skill-choice-list button.correct, .skill-choice-list button.correct-answer { border-color: var(--jade); color: #0d6752; background: var(--jade-soft); }
.skill-choice-list button.wrong { border-color: var(--danger); color: #9c2938; background: #fde8ea; }

.reading-passage { display: grid; gap: 10px; padding: 23px; border: 1px solid #d9ccba; border-radius: 18px; background: #faf6ee; }
.reading-passage p { margin: 0; font: 750 20px/1.7 "Songti SC",serif; }
.speaking-prompt { display: grid; place-items: center; padding: 25px; border-radius: 20px; background: linear-gradient(135deg,var(--coral-soft),#fff8f4); text-align: center; }
.speaking-prompt span { color: var(--coral-dark); font: 800 clamp(24px,4vw,36px)/1.4 "Songti SC",serif; }
.speaking-prompt b { margin-top: 7px; color: var(--jade); font-size: 14px; }
.speaking-prompt small { margin-top: 5px; color: var(--muted); font-size: 12px; }
.speaking-controls { display: flex; justify-content: center; gap: 8px; margin-top: 13px; }
.speaking-controls > button { min-height: 46px; }
.speaking-controls > button:first-child { padding: 0 16px; border: 1px solid var(--line); border-radius: 13px; color: var(--jade); background: #fff; font-size: 11px; font-weight: 800; cursor: pointer; }
.skill-live-status { margin: 10px auto; color: var(--muted); font-size: 11px; line-height: 1.55; text-align: center; }
.self-assess { display: flex; align-items: center; justify-content: center; gap: 7px; flex-wrap: wrap; }
.self-assess span { color: var(--muted); font-size: 10px; }
.self-assess button { min-height: 35px; padding: 0 10px; border: 1px solid var(--line); border-radius: 10px; background: #fff; font-size: 10px; cursor: pointer; }

.writing-prompt { display: grid; grid-template-columns: 45px 1fr; gap: 4px 13px; align-items: center; padding: 18px; border-radius: 17px; background: var(--blue-soft); }
.writing-prompt > span { display: grid; width: 43px; height: 43px; grid-row: 1 / 3; place-items: center; border-radius: 13px; color: #fff; background: var(--blue); font-size: 11px; font-weight: 850; }
.writing-prompt h3 { margin: 0; font-size: 18px; line-height: 1.45; }
.writing-prompt p { margin: 3px 0 0; color: var(--muted); font-size: 11px; }
.skill-writing-label { display: block; margin: 17px 0 7px; font-size: 11px; font-weight: 800; }
.skill-writing-input { width: 100%; min-height: 57px; padding: 0 15px; border: 1px solid var(--line); border-radius: 14px; outline: 0; background: #fff; font: 600 18px/1.4 "Songti SC",sans-serif; }
.skill-writing-input:focus { border-color: var(--jade); box-shadow: 0 0 0 4px rgba(22,126,105,.09); }
.skill-writing-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 10px; }

.skill-feedback { margin-top: 15px; padding: 16px; border-radius: 15px; background: #fde8ea; }
.skill-feedback.correct { background: var(--jade-soft); }
.skill-feedback > strong { color: var(--danger); font-size: 13px; }
.skill-feedback.correct > strong { color: var(--jade); }
.skill-feedback > p { margin: 5px 0; color: var(--muted); font-size: 11px; line-height: 1.5; }
.skill-feedback > small { color: var(--muted); font-size: 11px; }
.skill-language-reveal { display: grid; margin-top: 12px; padding-top: 12px; border-top: 1px solid rgba(56,86,78,.15); }
.skill-language-reveal b { margin-bottom: 7px; font-size: 11px; text-transform: uppercase; letter-spacing: .07em; }
.skill-language-reveal span { font: 700 17px/1.6 "Songti SC",serif; }
.skill-language-reveal small { margin-top: 5px; color: var(--muted); font-size: 11px; line-height: 1.55; }
.skill-navigation { display: grid; grid-template-columns: repeat(3,auto); justify-content: center; gap: 7px; margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line); }
.skill-navigation button { min-height: 39px; padding: 0 13px; border: 1px solid var(--line); border-radius: 11px; color: var(--muted); background: #fff; font-size: 10px; font-weight: 800; cursor: pointer; }
.skill-navigation button:disabled { opacity: .4; cursor: not-allowed; }

@media (max-width: 1100px) {
  .skills-snapshot-grid, .skill-overview-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 700px) {
  .skills-snapshot { padding: 17px 13px; }
  .skills-snapshot-head { align-items: flex-start; flex-direction: column; gap: 8px; }
  .skills-snapshot-grid, .skill-overview-grid { grid-template-columns: 1fr; }
  .skill-overview-card { min-height: 88px; }
  .skill-toolbar { align-items: flex-start; flex-direction: column; }
  .skill-total { text-align: left; }
  .blind-listening { grid-template-columns: 50px 1fr; }
  .blind-listening > span { width: 48px; height: 48px; }
  .blind-listening button { width: 100%; }
  .skill-choice-list { grid-template-columns: 1fr; }
  .skill-exercise-head { flex-direction: column; }
  .speaking-controls, .skill-writing-actions { align-items: stretch; flex-direction: column; }
  .skill-navigation { grid-template-columns: repeat(3,1fr); }
  .skill-navigation button { min-width: 0; padding: 5px; }
}