:root {
  color-scheme: dark;
  --bg: #0c111b;
  --bg-soft: #111827;
  --panel: #151e2e;
  --panel-2: #1b2638;
  --panel-3: #223049;
  --line: #2e3d56;
  --text: #ecf2ff;
  --muted: #9fb0ca;
  --faint: #71819a;
  --accent: #f1b95f;
  --accent-strong: #ffd17f;
  --accent-ink: #25180a;
  --blue: #6fb8ff;
  --green: #6fd6a0;
  --red: #ff8b8b;
  --purple: #c3a4ff;
  --shadow: 0 18px 45px rgba(0,0,0,.24);
  --radius: 16px;
  --sidebar: 270px;
  --content: 1180px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f6fa;
  --bg-soft: #edf1f7;
  --panel: #ffffff;
  --panel-2: #f7f9fc;
  --panel-3: #edf2f8;
  --line: #d4ddea;
  --text: #152033;
  --muted: #53647d;
  --faint: #78889e;
  --accent: #b97818;
  --accent-strong: #925a0b;
  --accent-ink: #fff7e9;
  --blue: #176fbd;
  --green: #19744a;
  --red: #b93737;
  --purple: #6541a8;
  --shadow: 0 15px 40px rgba(49,66,91,.12);
}

* { box-sizing: border-box; }
html { min-height: 100%; scroll-behavior: smooth; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text); }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
button { color: inherit; }

.noscript { padding: 1rem; background: #7c2424; color: white; text-align: center; }
.app-shell { min-height: 100vh; display: grid; grid-template-columns: var(--sidebar) minmax(0, 1fr); }
.sidebar { position: sticky; top: 0; height: 100vh; display: flex; flex-direction: column; gap: 1rem; padding: 1rem; background: linear-gradient(180deg, #111928 0%, #0c1320 100%); border-right: 1px solid var(--line); z-index: 40; overflow-y: auto; }
:root[data-theme="light"] .sidebar { background: linear-gradient(180deg, #ffffff 0%, #edf2f8 100%); }
.brand-row { display: flex; align-items: center; gap: .5rem; }
.brand { display: flex; align-items: center; gap: .8rem; text-decoration: none; min-width: 0; }
.brand-mark { display: grid; place-items: center; width: 44px; height: 44px; flex: 0 0 auto; border-radius: 13px; background: linear-gradient(145deg, var(--accent-strong), var(--accent)); color: var(--accent-ink); font-size: 1.45rem; font-weight: 900; box-shadow: inset 0 1px 0 rgba(255,255,255,.35); }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 1rem; letter-spacing: .01em; }
.brand small { color: var(--muted); font-size: .72rem; margin-top: .15rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.primary-nav, .secondary-nav { display: grid; gap: .25rem; }
.secondary-nav { margin-top: auto; }
.nav-item { display: flex; align-items: center; gap: .72rem; padding: .72rem .8rem; border: 1px solid transparent; border-radius: 11px; color: var(--muted); text-decoration: none; font-size: .91rem; font-weight: 650; transition: .15s ease; }
.nav-item span { width: 1.25rem; text-align: center; color: var(--faint); }
.nav-item:hover { color: var(--text); background: var(--panel-2); }
.nav-item.active { color: var(--text); border-color: color-mix(in srgb, var(--accent) 35%, var(--line)); background: color-mix(in srgb, var(--accent) 12%, var(--panel)); }
.nav-item.active span { color: var(--accent-strong); }
.nav-disclosure { min-width: 0; }
.nav-disclosure > summary { display: grid; grid-template-columns: 1.25rem minmax(0, 1fr) auto; align-items: center; gap: .72rem; padding: .72rem .8rem; border: 1px solid transparent; border-radius: 11px; color: var(--muted); cursor: pointer; list-style: none; font-size: .91rem; font-weight: 650; transition: .15s ease; }
.nav-disclosure > summary::-webkit-details-marker { display: none; }
.nav-disclosure > summary:hover { color: var(--text); background: var(--panel-2); }
.nav-disclosure > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.nav-disclosure > summary > span:first-child { width: 1.25rem; text-align: center; color: var(--faint); }
.nav-disclosure .nav-chevron { color: var(--faint); transition: transform .16s ease; }
.nav-disclosure[open] .nav-chevron { transform: rotate(180deg); }
.nav-disclosure-body { display: grid; gap: .2rem; margin: .2rem 0 .35rem .55rem; padding-left: .45rem; border-left: 1px solid var(--line); }
.nav-disclosure-body .nav-item { padding-top: .6rem; padding-bottom: .6rem; font-size: .84rem; }
.sidebar-progress { padding: .85rem; background: color-mix(in srgb, var(--panel) 82%, transparent); border: 1px solid var(--line); border-radius: 12px; }
.sidebar-progress-label { display: flex; justify-content: space-between; gap: 1rem; margin-bottom: .55rem; color: var(--muted); font-size: .76rem; }
.sidebar-progress-label strong { color: var(--text); }
.progress-track { height: 7px; background: var(--panel-3); border-radius: 999px; overflow: hidden; }
.progress-fill { width: 0; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-strong)); border-radius: inherit; transition: width .25s ease; }
.sidebar-progress small { display: block; margin-top: .55rem; color: var(--faint); font-size: .72rem; }

.main-shell { min-width: 0; }
.topbar { position: sticky; top: 0; z-index: 30; min-height: 66px; display: flex; align-items: center; gap: 1rem; padding: .75rem clamp(1rem, 3vw, 2rem); background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(14px); border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent); }
.breadcrumb { min-width: 0; flex: 1; color: var(--muted); font-size: .88rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topbar-actions { display: flex; align-items: center; justify-content: flex-end; gap: .45rem; }
.icon-btn, .pill-btn, .btn { border: 1px solid var(--line); background: var(--panel); color: var(--text); cursor: pointer; transition: .15s ease; }
.icon-btn:hover, .pill-btn:hover, .btn:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--line)); transform: translateY(-1px); }
.icon-btn { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; }
.pill-btn { min-height: 38px; padding: .48rem .72rem; border-radius: 999px; color: var(--muted); font-size: .78rem; font-weight: 700; }
.install-app-btn { border-color: color-mix(in srgb, var(--accent) 58%, var(--line)); color: var(--accent-strong); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .45rem; min-height: 40px; padding: .58rem .9rem; border-radius: 10px; font-weight: 750; text-decoration: none; }
.btn.primary { border-color: var(--accent); background: var(--accent); color: var(--accent-ink); }
.btn.secondary { background: var(--panel-2); }
.btn.ghost { background: transparent; }
.btn.danger { border-color: color-mix(in srgb, var(--red) 55%, var(--line)); color: var(--red); }
.btn.small { min-height: 33px; padding: .35rem .62rem; font-size: .78rem; border-radius: 8px; }
.btn:disabled, .pill-btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.mobile-only { display: none; }
.sidebar-backdrop { display: none; }

.view { width: min(100%, var(--content)); margin: 0 auto; padding: clamp(1.2rem, 3vw, 2.3rem); outline: none; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 1.5rem; margin-bottom: 1.4rem; }
.page-head h1 { margin: 0 0 .35rem; font-size: clamp(1.65rem, 3vw, 2.5rem); line-height: 1.06; letter-spacing: -.025em; }
.page-head p { margin: 0; max-width: 760px; color: var(--muted); line-height: 1.65; }
.eyebrow { display: inline-block; margin-bottom: .45rem; color: var(--accent-strong); font-size: .74rem; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; }
.hero { position: relative; overflow: hidden; padding: clamp(1.2rem, 4vw, 2.2rem); border: 1px solid var(--line); border-radius: 22px; background: radial-gradient(circle at 90% 10%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 30%), linear-gradient(145deg, var(--panel), var(--panel-2)); box-shadow: var(--shadow); }
.hero::after { content: "听"; position: absolute; right: 4%; bottom: -25%; font-size: clamp(7rem, 18vw, 14rem); line-height: 1; color: color-mix(in srgb, var(--accent) 7%, transparent); font-weight: 900; pointer-events: none; }
.hero > * { position: relative; z-index: 1; }
.hero h1 { margin: .2rem 0 .65rem; max-width: 760px; font-size: clamp(2rem, 5vw, 4.25rem); line-height: .98; letter-spacing: -.045em; }
.hero-beginner { padding-top: clamp(1.15rem, 3vw, 1.75rem); padding-bottom: clamp(1.15rem, 3vw, 1.75rem); }
.hero-beginner h1 { max-width: 820px; font-size: clamp(2rem, 4.3vw, 3.55rem); }
.hero .zh-hero { display: block; margin-bottom: .4rem; color: var(--accent-strong); font-size: clamp(1rem, 2vw, 1.35rem); letter-spacing: .06em; }
.hero p { max-width: 710px; color: var(--muted); line-height: 1.7; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .65rem; margin-top: 1.1rem; }
.first-day-focus { padding: 1rem; border: 1px solid color-mix(in srgb, var(--green) 35%, var(--line)); border-radius: 18px; background: linear-gradient(145deg, color-mix(in srgb, var(--green) 7%, var(--panel)), var(--panel)); }
.first-day-focus .section-head { align-items: flex-end; }
.first-day-focus .section-head h2 { font-size: 1.45rem; }
.first-day-steps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .8rem; }
.first-day-step { grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: .8rem; }
.first-day-step p { margin: .3rem 0 0; font-size: .82rem; }
.step-number { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); font-weight: 900; }
.first-day-note { margin: .8rem .2rem 0; }
.dashboard-explore-later { overflow: hidden; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }
.dashboard-explore-later > summary, .lesson-extra-vocab > summary { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: 1rem 1.1rem; cursor: pointer; list-style: none; }
.dashboard-explore-later > summary::-webkit-details-marker, .lesson-extra-vocab > summary::-webkit-details-marker { display: none; }
.dashboard-explore-later > summary:hover, .lesson-extra-vocab > summary:hover { background: var(--panel-2); }
.dashboard-explore-later > summary:focus-visible, .lesson-extra-vocab > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.dashboard-explore-later > summary span:first-child, .lesson-extra-vocab > summary span:first-child { display: grid; gap: .24rem; }
.dashboard-explore-later > summary small, .lesson-extra-vocab > summary small { color: var(--muted); font-weight: 500; }
.dashboard-explore-later[open] > summary, .lesson-extra-vocab[open] > summary { border-bottom: 1px solid var(--line); }
.dashboard-explore-grid { padding: 1rem; grid-template-columns: repeat(2, minmax(0, 1fr)); }

.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .85rem; margin: 1rem 0; }
.stat-card { padding: 1rem; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); }
.stat-card strong { display: block; font-size: 1.55rem; line-height: 1; }
.stat-card span { display: block; margin-top: .45rem; color: var(--muted); font-size: .78rem; }
.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.card-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card { min-width: 0; padding: 1rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); box-shadow: 0 8px 25px rgba(0,0,0,.08); }
.card h2, .card h3 { margin: 0 0 .55rem; }
.card p { color: var(--muted); line-height: 1.6; }
.card-link { display: block; text-decoration: none; transition: .15s ease; }
.first-day-steps .first-day-step { display: grid; }
.card-link:hover { border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); transform: translateY(-2px); }
.section { margin-top: 1.6rem; }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: .8rem; }
.section-head h2 { margin: 0; font-size: 1.18rem; }
.section-head p { margin: 0; color: var(--muted); font-size: .85rem; }
.callout { padding: 1rem 1.05rem; border-left: 4px solid var(--blue); border-radius: 8px 13px 13px 8px; background: color-mix(in srgb, var(--blue) 8%, var(--panel)); color: var(--muted); line-height: 1.6; }
.callout.warning { border-left-color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, var(--panel)); }
.callout.success { border-left-color: var(--green); background: color-mix(in srgb, var(--green) 8%, var(--panel)); }
.callout.danger { border-left-color: var(--red); background: color-mix(in srgb, var(--red) 8%, var(--panel)); }
.badge { display: inline-flex; align-items: center; gap: .28rem; padding: .24rem .48rem; border-radius: 999px; background: var(--panel-3); color: var(--muted); font-size: .68rem; font-weight: 800; }
.badge.accent { background: color-mix(in srgb, var(--accent) 15%, var(--panel)); color: var(--accent-strong); }
.badge.green { background: color-mix(in srgb, var(--green) 13%, var(--panel)); color: var(--green); }
.badge.red { background: color-mix(in srgb, var(--red) 12%, var(--panel)); color: var(--red); }
.meta-row { display: flex; flex-wrap: wrap; gap: .45rem; }
.inline-actions { display: flex; flex-wrap: wrap; align-items: center; gap: .55rem; }
.muted { color: var(--muted); }
.faint { color: var(--faint); }
.small-text { font-size: .8rem; }
hr { border: 0; border-top: 1px solid var(--line); margin: 1.35rem 0; }

.stage-list { display: grid; gap: 1rem; }
.stage-card { border: 1px solid var(--line); border-radius: 17px; background: var(--panel); overflow: hidden; }
.stage-header { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 1rem; padding: 1rem; background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 7%, var(--panel)), var(--panel)); }
.stage-number { display: grid; place-items: center; width: 46px; height: 46px; border-radius: 13px; background: var(--panel-3); color: var(--accent-strong); font-weight: 900; }
.stage-header h2 { margin: 0; font-size: 1.08rem; }
.stage-header p { margin: .28rem 0 0; color: var(--muted); font-size: .82rem; line-height: 1.45; }
.stage-progress { min-width: 88px; text-align: right; color: var(--muted); font-size: .78rem; }
.lesson-list { border-top: 1px solid var(--line); }
.lesson-row { display: grid; grid-template-columns: 34px minmax(0, 1fr) auto; gap: .75rem; align-items: center; padding: .78rem 1rem; text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent); transition: .12s ease; }
.lesson-row:last-child { border-bottom: 0; }
.lesson-row:hover { background: var(--panel-2); }
.lesson-status { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--line); color: var(--faint); font-size: .75rem; }
.lesson-row.complete .lesson-status { border-color: var(--green); background: color-mix(in srgb, var(--green) 14%, var(--panel)); color: var(--green); }
.lesson-row strong { display: block; font-size: .9rem; }
.lesson-row small { display: block; margin-top: .18rem; color: var(--muted); }
.lesson-time { color: var(--faint); font-size: .75rem; }

.lesson-head { display: grid; grid-template-columns: 1fr auto; gap: 1rem; align-items: start; }
.lesson-head h1 { margin: .1rem 0 .55rem; font-size: clamp(1.7rem, 3vw, 2.65rem); }
.lesson-head p { color: var(--muted); line-height: 1.65; }
.lesson-nav { display: flex; gap: .4rem; }
.lesson-kickoff { overflow: hidden; border: 1px solid color-mix(in srgb, var(--blue) 32%, var(--line)); border-radius: 18px; background: linear-gradient(145deg, color-mix(in srgb, var(--blue) 7%, var(--panel)), var(--panel)); }
.lesson-roadmap { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-bottom: 1px solid var(--line); }
.lesson-roadmap-step { position: relative; display: grid; grid-template-columns: auto minmax(0, 1fr); column-gap: .55rem; align-items: center; padding: .78rem; color: var(--muted); }
.lesson-roadmap-step:not(:last-child)::after { content: ""; position: absolute; top: 22%; right: 0; bottom: 22%; width: 1px; background: var(--line); }
.lesson-roadmap-step > span { grid-row: 1 / 3; display: grid; place-items: center; width: 27px; height: 27px; border: 1px solid var(--line); border-radius: 50%; font-size: .73rem; font-weight: 900; }
.lesson-roadmap-step strong { color: var(--text); font-size: .82rem; }
.lesson-roadmap-step small { color: var(--faint); font-size: .69rem; }
.lesson-roadmap-step.active > span { border-color: var(--accent); background: var(--accent); color: var(--accent-ink); }
.audio-first-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 1.25rem; padding: 1.15rem; }
.audio-first-card h2 { margin: 0 0 .35rem; font-size: 1.35rem; }
.audio-first-card p { max-width: 720px; margin: 0; color: var(--muted); line-height: 1.6; }
.audio-first-card .eyebrow { margin-bottom: .3rem; }
.lesson-vocab-head > div { display: grid; gap: .25rem; }
.lesson-extra-vocab { margin-top: .8rem; overflow: hidden; border: 1px dashed var(--line); border-radius: 14px; background: color-mix(in srgb, var(--panel) 72%, transparent); }
.lesson-extra-vocab-body { padding: .9rem; }
.vocab-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .7rem; }
.lesson-focus-vocab { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.vocab-card { position: relative; min-height: 150px; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: .8rem; text-align: center; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); }
.vocab-card .hanzi { font-size: 1.55rem; font-weight: 800; line-height: 1.2; }
.vocab-card .pinyin { margin-top: .4rem; }
.vocab-card .gloss { margin-top: .42rem; color: var(--muted); font-size: .76rem; line-height: 1.35; }
.vocab-card .card-actions { position: absolute; inset: auto .45rem .42rem; display: flex; justify-content: space-between; }
.audio-btn, .star-btn { width: 30px; height: 30px; display: grid; place-items: center; padding: 0; border: 1px solid var(--line); border-radius: 8px; background: var(--panel-2); color: var(--muted); cursor: pointer; }
.star-btn.active { color: var(--accent-strong); border-color: var(--accent); }
.pinyin { color: var(--blue); font-size: .9rem; line-height: 1.45; }
.pinyin.hidden { display: none; }
.pinyin.revealable { filter: blur(5px); user-select: none; cursor: pointer; transition: filter .15s ease; }
.pinyin.revealable.revealed { filter: none; user-select: text; }
.pinyin-placeholder { color: var(--faint); font-size: .75rem; cursor: pointer; }

.grammar-grid { display: grid; gap: 1rem; }
.grammar-card { padding: 1rem; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }
.grammar-top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.grammar-card h3 { margin: .5rem 0; font-size: 1.12rem; }
.formula { display: inline-block; padding: .38rem .6rem; border: 1px solid color-mix(in srgb, var(--purple) 45%, var(--line)); border-radius: 8px; background: color-mix(in srgb, var(--purple) 8%, var(--panel)); color: var(--purple); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .79rem; }
.grammar-card > p { color: var(--muted); line-height: 1.65; }
.examples { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; margin: .85rem 0; }
.example { position: relative; padding: .8rem 2.7rem .8rem .85rem; border-radius: 11px; background: var(--panel-2); }
.example .hanzi-line { font-size: 1.15rem; font-weight: 750; }
.example .translation { margin-top: .3rem; color: var(--muted); font-size: .78rem; }
.example .audio-btn { position: absolute; top: .55rem; right: .55rem; }
.pitfall { padding: .72rem .8rem; border-radius: 10px; background: color-mix(in srgb, var(--red) 7%, var(--panel-2)); color: var(--muted); font-size: .82rem; line-height: 1.5; }
.pitfall strong { color: var(--red); }
.quiz { margin-top: .85rem; padding-top: .85rem; border-top: 1px solid var(--line); }
.quiz .prompt { margin-bottom: .6rem; font-weight: 750; }
.quiz-options { display: grid; gap: .42rem; }
.quiz-option { padding: .62rem .75rem; text-align: left; border: 1px solid var(--line); border-radius: 9px; background: var(--panel-2); color: var(--text); cursor: pointer; }
.quiz-option:hover { border-color: var(--blue); }
.quiz-option.correct { border-color: var(--green); background: color-mix(in srgb, var(--green) 10%, var(--panel)); }
.quiz-option.incorrect { border-color: var(--red); background: color-mix(in srgb, var(--red) 10%, var(--panel)); }
.quiz-option.locked { cursor: default; }
.quiz-feedback { margin-top: .55rem; color: var(--muted); font-size: .82rem; line-height: 1.5; }

.dialogue-card { border: 1px solid var(--line); border-radius: 17px; background: var(--panel); overflow: hidden; }
.dialogue-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; padding: 1rem; border-bottom: 1px solid var(--line); background: var(--panel-2); }
.dialogue-head h3 { margin: 0 0 .25rem; }
.dialogue-head p { margin: 0; color: var(--muted); font-size: .82rem; }
.dialogue-lines { padding: .7rem 1rem; }
.dialogue-line { display: grid; grid-template-columns: 90px minmax(0, 1fr) auto; gap: .75rem; align-items: start; padding: .72rem 0; border-bottom: 1px solid color-mix(in srgb, var(--line) 65%, transparent); }
.dialogue-line:last-child { border-bottom: 0; }
.speaker { color: var(--accent-strong); font-size: .78rem; font-weight: 850; }
.line-zh { font-size: 1.08rem; font-weight: 730; line-height: 1.45; }
.line-en { margin-top: .28rem; color: var(--muted); font-size: .8rem; line-height: 1.4; }
.task-card { padding: 1rem; border: 1px dashed color-mix(in srgb, var(--accent) 60%, var(--line)); border-radius: 14px; background: color-mix(in srgb, var(--accent) 7%, var(--panel)); }
.task-card h3 { margin: 0 0 .45rem; }
.task-card p { margin: 0; color: var(--muted); line-height: 1.6; }
.lesson-footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .8rem; margin-top: 1.4rem; padding-top: 1rem; border-top: 1px solid var(--line); }

/* The default learning path is intentionally quiet: one decision on the dashboard,
   then one activity at a time inside a lesson. */
.guided-dashboard { width: min(100%, 640px); min-height: calc(100vh - 150px); display: grid; align-content: center; gap: 1.25rem; margin: 0 auto; }
.dashboard-intro { text-align: center; }
.dashboard-intro h1 { margin: 0; font-size: clamp(2.2rem, 7vw, 3.7rem); line-height: 1; letter-spacing: -.045em; }
.dashboard-intro p { margin: .75rem auto 0; color: var(--muted); font-size: 1rem; }
.dashboard-next-card { padding: clamp(1.25rem, 4vw, 1.8rem); border: 1px solid color-mix(in srgb, var(--accent) 42%, var(--line)); border-radius: 22px; background: linear-gradient(155deg, color-mix(in srgb, var(--accent) 10%, var(--panel)), var(--panel)); box-shadow: var(--shadow); }
.dashboard-lesson-label { display: flex; justify-content: space-between; gap: 1rem; color: var(--accent-strong); font-size: .75rem; font-weight: 850; letter-spacing: .06em; text-transform: uppercase; }
.dashboard-next-card h2 { margin: .7rem 0 .45rem; font-size: clamp(1.55rem, 4vw, 2.05rem); line-height: 1.12; }
.dashboard-next-card > p { margin: 0; color: var(--muted); line-height: 1.55; }
.dashboard-start { width: 100%; min-height: 50px; margin-top: 1.2rem; border-radius: 13px; font-size: 1rem; }
.dashboard-resume { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: .7rem; margin-top: 1rem; }
.dashboard-resume small { color: var(--faint); white-space: nowrap; }
.dashboard-complete-mark, .player-complete-mark { display: grid; place-items: center; width: 58px; height: 58px; margin: 0 auto .8rem; border-radius: 50%; background: color-mix(in srgb, var(--green) 16%, var(--panel)); color: var(--green); font-size: 1.75rem; font-weight: 900; }
.dashboard-finished { text-align: center; }
.dashboard-quiet-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: .55rem; color: var(--muted); font-size: .84rem; }
.dashboard-quiet-actions a { text-underline-offset: 3px; }

body[data-route="lesson"] .view { width: min(100%, 820px); }
.lesson-player { min-height: calc(100vh - 145px); display: grid; grid-template-rows: auto minmax(360px, 1fr) auto; }
.lesson-player-top { display: grid; grid-template-columns: 44px minmax(0, 1fr) 44px; align-items: center; gap: .85rem; }
.player-exit { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 11px; color: var(--muted); text-decoration: none; font-size: 1.55rem; }
.player-exit:hover { background: var(--panel-2); color: var(--text); }
.player-progress-wrap { min-width: 0; }
.player-progress-label { display: flex; justify-content: space-between; gap: .8rem; margin-bottom: .42rem; color: var(--muted); font-size: .72rem; font-weight: 750; }
.player-notes-link { justify-self: end; color: var(--accent-strong); font-size: .78rem; font-weight: 800; text-underline-offset: 3px; }
.player-notes-placeholder { width: 44px; }
.lesson-activity { width: min(100%, 660px); display: flex; flex-direction: column; align-items: center; justify-content: center; margin: 0 auto; padding: clamp(2rem, 7vh, 4.5rem) 1rem; text-align: center; }
.lesson-activity h1 { max-width: 620px; margin: 0; font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.05; letter-spacing: -.035em; }
.activity-lead { max-width: 590px; margin: 1rem auto 0; color: var(--muted); font-size: clamp(1rem, 2vw, 1.15rem); line-height: 1.65; }
.activity-lead.compact-copy { max-width: 560px; }
.activity-gentle-note { margin-top: 1.25rem; padding: .65rem .85rem; border-radius: 10px; background: var(--panel-2); color: var(--muted); font-size: .82rem; }
.player-audio-button { min-width: min(100%, 300px); min-height: 64px; display: inline-flex; align-items: center; justify-content: center; gap: .75rem; margin-top: 1.6rem; padding: .85rem 1.2rem; border: 1px solid color-mix(in srgb, var(--blue) 50%, var(--line)); border-radius: 16px; background: color-mix(in srgb, var(--blue) 10%, var(--panel)); color: var(--text); cursor: pointer; }
.player-audio-button > span { color: var(--blue); font-size: 1.25rem; }
.player-audio-button.compact { min-height: 50px; margin-top: 1.25rem; border-radius: 13px; }
.player-word { margin-top: 1.5rem; }
.player-hanzi { font-size: clamp(4.2rem, 14vw, 7rem); font-weight: 850; line-height: 1; }
.player-word > .pinyin, .player-example > .pinyin { margin-top: .8rem; font-size: 1.15rem; }
.player-meaning { max-width: 440px; margin: .55rem auto 0; color: var(--muted); font-size: 1rem; line-height: 1.45; }
.sound-contrast-grid { width: min(100%, 620px); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .75rem; margin-top: 1.35rem; }
.sound-contrast-card { min-width: 0; padding: 1rem .75rem; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }
.sound-contrast-hanzi { font-size: clamp(2.2rem, 8vw, 3.4rem); font-weight: 850; line-height: 1; }
.sound-contrast-pinyin { margin-top: .45rem; color: var(--accent-strong); font-size: 1.05rem; font-weight: 800; }
.sound-contrast-note { min-height: 2.8em; margin-top: .35rem; color: var(--muted); font-size: .76rem; line-height: 1.4; }
.sound-contrast-card .player-audio-button { width: 100%; min-width: 0; padding-inline: .55rem; }
.player-formula { display: inline-block; max-width: 100%; margin-top: 1.35rem; padding: .7rem 1rem; border: 1px solid color-mix(in srgb, var(--purple) 48%, var(--line)); border-radius: 12px; background: color-mix(in srgb, var(--purple) 9%, var(--panel)); color: var(--purple); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-weight: 750; }
.player-example { width: min(100%, 570px); margin-top: 1.5rem; padding: 1.4rem; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }
.player-example-hanzi { font-size: clamp(1.8rem, 6vw, 3rem); font-weight: 800; line-height: 1.3; }
.player-example-translation { margin-top: .65rem; color: var(--muted); line-height: 1.5; }
.lesson-activity .quiz { width: min(100%, 580px); margin-top: 1.3rem; padding-top: 0; border-top: 0; text-align: left; }
.lesson-activity .quiz .prompt { font-size: 1.02rem; text-align: center; }
.lesson-activity .quiz-option { min-height: 48px; padding: .75rem .85rem; }
.lesson-player-actions { display: grid; grid-template-columns: minmax(110px, auto) minmax(180px, 1fr); align-items: center; gap: .75rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.player-back { justify-self: start; }
.player-primary { width: min(100%, 360px); min-height: 48px; justify-self: end; border-radius: 12px; }

.notes-locked { width: min(100%, 580px); min-height: calc(100vh - 170px); display: flex; flex-direction: column; align-items: center; justify-content: center; margin: 0 auto; text-align: center; }
.notes-locked h1 { margin: 0; font-size: clamp(1.8rem, 5vw, 2.7rem); }
.notes-locked p { color: var(--muted); }
.notes-locked .btn { margin-top: .7rem; }
.notes-page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.notes-page-head h1 { margin: 0; font-size: clamp(1.8rem, 4vw, 2.7rem); }
.notes-page-head p { margin: .5rem 0 0; color: var(--muted); }
.note-section { margin-top: 1rem; padding: 1.15rem; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }
.note-section h2 { margin: 0 0 .85rem; font-size: 1.15rem; }
.note-section > p { color: var(--muted); line-height: 1.6; }
.note-section .player-formula { margin-top: 0; }
.note-vocab-list, .note-dialogue, .note-examples { display: grid; gap: 0; }
.note-vocab-row { display: grid; grid-template-columns: minmax(130px, .8fr) minmax(180px, 1.4fr) auto; align-items: center; gap: 1rem; padding: .75rem 0; border-bottom: 1px solid var(--line); }
.note-vocab-row:last-child, .note-dialogue-line:last-child { border-bottom: 0; }
.note-vocab-row strong { display: block; font-size: 1.15rem; }
.note-vocab-row .pinyin { margin-top: .15rem; }
.note-vocab-row > span, .note-examples span, .note-dialogue-line > div > span:last-child { color: var(--muted); font-size: .84rem; }
.note-examples { margin-top: .85rem; border-top: 1px solid var(--line); }
.note-examples > div { display: grid; grid-template-columns: minmax(160px, 1fr) minmax(180px, 1fr); gap: .3rem 1rem; padding: .7rem 0; border-bottom: 1px solid var(--line); }
.note-examples .pinyin { grid-column: 1; }
.note-warning { margin-bottom: 0; padding: .7rem .8rem; border-radius: 10px; background: color-mix(in srgb, var(--red) 7%, var(--panel-2)); }
.note-warning strong { color: var(--red); }
.note-dialogue-line { display: grid; grid-template-columns: 90px minmax(0, 1fr) auto; gap: .75rem; align-items: start; padding: .75rem 0; border-bottom: 1px solid var(--line); }
.note-dialogue-line > strong { color: var(--accent-strong); font-size: .82rem; }
.note-dialogue-line > div { display: grid; gap: .15rem; }
.note-dialogue-hanzi { color: var(--text) !important; font-size: 1rem !important; font-weight: 750; }
.note-listening-boundary { margin-top: .9rem; padding: .8rem; border-radius: 10px; background: var(--panel-2); color: var(--muted); font-size: .84rem; line-height: 1.55; }
.note-listening-boundary strong { color: var(--text); }
.note-listening-boundary p { margin: .4rem 0 0; }

.filters { display: flex; flex-wrap: wrap; gap: .55rem; margin-bottom: 1rem; }
.input, .select, .textarea { width: 100%; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); color: var(--text); }
.input, .select { min-height: 41px; padding: .55rem .7rem; }
.textarea { min-height: 110px; padding: .75rem; resize: vertical; line-height: 1.5; }
.filters .input { flex: 1 1 260px; }
.filters .select { width: auto; min-width: 160px; }
.scene-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .85rem; }
.scene-card { display: flex; flex-direction: column; padding: 1rem; border: 1px solid var(--line); border-radius: 15px; background: var(--panel); text-decoration: none; }
.scene-card:hover { border-color: color-mix(in srgb, var(--blue) 55%, var(--line)); }
.scene-card h3 { margin: .55rem 0 .35rem; font-size: 1rem; }
.scene-card p { margin: 0 0 auto; color: var(--muted); font-size: .81rem; line-height: 1.5; }
.scene-card .meta-row { margin-top: .8rem; }
.scene-pass { padding: 1rem; border: 1px solid var(--line); border-radius: 15px; background: var(--panel); }
.scene-pass + .scene-pass { margin-top: .8rem; }
.scene-pass h2 { margin: 0 0 .45rem; font-size: 1.05rem; }
.audio-stage { display: grid; place-items: center; min-height: 170px; padding: 1rem; border: 1px dashed var(--line); border-radius: 14px; background: radial-gradient(circle, color-mix(in srgb, var(--blue) 10%, var(--panel)), var(--panel)); text-align: center; }
.audio-orb { width: 78px; height: 78px; display: grid; place-items: center; border-radius: 50%; border: 1px solid color-mix(in srgb, var(--blue) 50%, var(--line)); background: color-mix(in srgb, var(--blue) 12%, var(--panel)); font-size: 1.7rem; cursor: pointer; }
.transcript-locked { padding: 1rem; border-radius: 11px; background: var(--panel-2); color: var(--muted); text-align: center; }

.frequency-toolbar { display: grid; grid-template-columns: 1fr auto auto; gap: .6rem; align-items: center; }
.frequency-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .7rem; margin-top: 1rem; }
.freq-card { position: relative; min-height: 170px; padding: .85rem; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); }
.freq-rank { color: var(--faint); font-size: .7rem; font-weight: 800; }
.freq-card .hanzi { margin-top: .35rem; font-size: 1.5rem; font-weight: 850; }
.freq-card .gloss { margin-top: .45rem; color: var(--muted); font-size: .77rem; line-height: 1.4; }
.freq-card .card-actions { position: absolute; right: .55rem; bottom: .55rem; left: .55rem; display: flex; justify-content: space-between; }
.pagination { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: .55rem; margin-top: 1rem; }
.lexicon-table { display: grid; gap: .42rem; }
.lex-row { display: grid; grid-template-columns: minmax(110px, .7fr) minmax(120px, .9fr) minmax(240px, 2fr) auto; gap: .8rem; align-items: center; padding: .72rem .8rem; border: 1px solid var(--line); border-radius: 11px; background: var(--panel); }
.lex-word { font-size: 1.15rem; font-weight: 800; }
.lex-gloss { color: var(--muted); font-size: .82rem; line-height: 1.45; }

.review-card { max-width: 670px; margin: 0 auto; padding: clamp(1rem, 4vw, 2rem); border: 1px solid var(--line); border-radius: 20px; background: var(--panel); text-align: center; box-shadow: var(--shadow); }
.review-card .hanzi { font-size: clamp(2.6rem, 8vw, 5rem); font-weight: 900; }
.review-card .answer { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.review-grades { display: grid; grid-template-columns: repeat(4, 1fr); gap: .55rem; margin-top: 1rem; }
.review-empty { text-align: center; padding: 2rem; }

.settings-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.pwa-status { display: flex; align-items: center; flex-wrap: wrap; gap: .45rem; margin: .75rem 0; }
.setting-row { display: grid; gap: .5rem; margin-top: .75rem; }
.setting-row label { color: var(--muted); font-size: .8rem; font-weight: 700; }
.range-row { display: grid; grid-template-columns: 1fr auto; gap: .75rem; align-items: center; }
.range { width: 100%; }
.voice-diagnostic { margin-top: 1rem; overflow: hidden; border: 1px solid var(--line); border-radius: 13px; background: var(--panel-2); }
.voice-diagnostic > summary { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .85rem .9rem; cursor: pointer; list-style: none; }
.voice-diagnostic > summary::-webkit-details-marker { display: none; }
.voice-diagnostic > summary strong, .voice-diagnostic > summary small { display: block; }
.voice-diagnostic > summary small { margin-top: .2rem; color: var(--muted); font-weight: 500; }
.voice-diagnostic[open] > summary { border-bottom: 1px solid var(--line); }
.voice-diagnostic[open] > summary > span:last-child { transform: rotate(180deg); }
.voice-diagnostic-body { display: grid; gap: .65rem; padding: .9rem; }
.voice-diagnostic-body > p { margin: 0 0 .2rem; color: var(--muted); font-size: .8rem; line-height: 1.5; }
.voice-diagnostic-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: .75rem; padding: .7rem; border: 1px solid var(--line); border-radius: 11px; background: var(--panel); }
.voice-diagnostic-row.active { border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); }
.voice-diagnostic-copy { min-width: 0; }
.voice-diagnostic-copy strong, .voice-diagnostic-copy span { display: block; overflow-wrap: anywhere; }
.voice-diagnostic-copy span { margin-top: .2rem; color: var(--muted); font-size: .73rem; }
.list { margin: .55rem 0 0; padding-left: 1.15rem; color: var(--muted); line-height: 1.7; }
.timeline { display: grid; gap: .75rem; }
.timeline-item { display: grid; grid-template-columns: 145px minmax(0,1fr); gap: 1rem; padding: .85rem; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.timeline-item strong { color: var(--accent-strong); }

.toast-region { position: fixed; right: 1rem; bottom: 1rem; z-index: 100; display: grid; gap: .55rem; pointer-events: none; }
.toast { max-width: 340px; padding: .75rem .9rem; border: 1px solid var(--line); border-radius: 10px; background: var(--panel-2); color: var(--text); box-shadow: var(--shadow); animation: toast-in .18s ease; }
@keyframes toast-in { from { transform: translateY(8px); opacity: 0; } }
.modal { width: min(680px, calc(100vw - 2rem)); max-height: 85vh; overflow: auto; border: 1px solid var(--line); border-radius: 17px; background: var(--panel); color: var(--text); box-shadow: var(--shadow); }
.modal::backdrop { background: rgba(0,0,0,.62); backdrop-filter: blur(2px); }
.modal-close { position: sticky; top: .35rem; float: right; width: 34px; height: 34px; border: 1px solid var(--line); border-radius: 9px; background: var(--panel-2); color: var(--text); cursor: pointer; z-index: 1; }

@media (max-width: 1050px) {
  .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .card-grid, .scene-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .vocab-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .frequency-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 820px) {
  .mobile-only { display: grid; }
  .app-shell { grid-template-columns: minmax(0, 1fr); }
  .sidebar { position: fixed; left: 0; top: 0; width: min(88vw, 310px); transform: translateX(-105%); transition: transform .2s ease; box-shadow: var(--shadow); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-backdrop { position: fixed; inset: 0; z-index: 35; background: rgba(0,0,0,.55); }
  .sidebar-backdrop.open { display: block; }
  .brand-row #sidebarClose { margin-left: auto; order: 2; }
  .topbar { padding: .65rem .8rem; }
  .breadcrumb { display: block; color: var(--text); font-size: .82rem; font-weight: 750; }
  .topbar-actions { margin-left: auto; }
  .pill-btn { padding: .4rem .55rem; font-size: .7rem; }
  #scriptToggle, #pinyinCycle, #quickAudio, #themeToggle { display: none; }
  .page-head { display: block; }
  .page-head .inline-actions { margin-top: .8rem; }
  .lesson-head { grid-template-columns: 1fr; }
  .lesson-nav { justify-content: flex-end; }
  .audio-first-card { grid-template-columns: 1fr; }
  .audio-first-card .btn { justify-self: start; }
  .vocab-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .examples { grid-template-columns: 1fr; }
  .dialogue-line { grid-template-columns: 70px minmax(0,1fr) auto; }
  .frequency-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lex-row { grid-template-columns: minmax(95px,.7fr) minmax(100px,.9fr) minmax(150px,2fr) auto; }
  .settings-grid { grid-template-columns: 1fr; }
  .guided-dashboard { min-height: calc(100svh - 112px); }
  .lesson-player { min-height: calc(100svh - 112px); grid-template-rows: auto minmax(0, 1fr) auto; }
  .lesson-activity { padding-top: 2rem; padding-bottom: 2rem; }
  .notes-page-head { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 580px) {
  .view { padding: 1rem .75rem 2rem; }
  .topbar-actions { gap: .25rem; }
  #scriptToggle { display: none; }
  .hero { border-radius: 17px; }
  .stats-grid, .card-grid, .card-grid.two, .scene-grid { grid-template-columns: 1fr; }
  .first-day-focus { padding: .8rem; }
  .first-day-focus .section-head, .lesson-vocab-head { align-items: flex-start; flex-direction: column; }
  .first-day-steps { grid-template-columns: 1fr; }
  .dashboard-explore-grid { grid-template-columns: 1fr; }
  .lesson-roadmap { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lesson-roadmap-step:nth-child(2)::after { display: none; }
  .lesson-roadmap-step:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .audio-first-card { padding: 1rem; }
  .audio-first-card .btn { width: 100%; }
  .vocab-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .vocab-card { min-height: 160px; padding-bottom: 3.1rem; }
  .vocab-card .card-actions { inset: auto .38rem .38rem; }
  .vocab-card .audio-btn, .vocab-card .star-btn { width: 38px; height: 38px; }
  .vocab-card .hanzi-deck-btn { min-width: 42px; height: 38px; }
  .stage-header { grid-template-columns: auto 1fr; }
  .stage-progress { grid-column: 2; text-align: left; }
  .lesson-row { grid-template-columns: 30px minmax(0,1fr); }
  .lesson-time { grid-column: 2; }
  .dialogue-line { grid-template-columns: 1fr auto; }
  .speaker { grid-column: 1 / -1; }
  .frequency-toolbar { grid-template-columns: 1fr 1fr; }
  .frequency-toolbar .input { grid-column: 1 / -1; }
  .frequency-grid { grid-template-columns: 1fr 1fr; }
  .lex-row { grid-template-columns: 1fr auto; }
  .lex-row .pinyin, .lex-gloss { grid-column: 1; }
  .review-grades { grid-template-columns: repeat(2, 1fr); }
  .timeline-item { grid-template-columns: 1fr; gap: .3rem; }
  .dashboard-next-card { border-radius: 18px; }
  .lesson-player-top { grid-template-columns: 40px minmax(0, 1fr) 40px; gap: .55rem; }
  .lesson-activity { padding: 1.5rem .25rem; }
  .lesson-activity h1 { font-size: clamp(1.85rem, 9vw, 2.55rem); }
  .activity-lead { font-size: 1rem; line-height: 1.55; }
  .player-hanzi { font-size: clamp(4rem, 22vw, 6rem); }
  .player-audio-button { width: 100%; }
  .sound-contrast-grid { grid-template-columns: 1fr; }
  .sound-contrast-note { min-height: 0; }
  .voice-diagnostic-row { grid-template-columns: 1fr; }
  .voice-diagnostic-row .inline-actions { justify-content: flex-start; }
  .lesson-player-actions { grid-template-columns: auto minmax(0, 1fr); }
  .player-primary { width: 100%; }
  .note-vocab-row { grid-template-columns: minmax(0, 1fr) auto; gap: .5rem; }
  .note-vocab-row > span { grid-column: 1; }
  .note-examples > div { grid-template-columns: 1fr; }
  .note-dialogue-line { grid-template-columns: minmax(0, 1fr) auto; }
  .note-dialogue-line > strong { grid-column: 1 / -1; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

.pinyin-toggle {
  margin-top: .35rem;
  padding: .2rem .45rem;
  border: 1px dashed var(--line);
  border-radius: 7px;
  background: transparent;
  color: var(--faint);
  font-size: .72rem;
  cursor: pointer;
}
.pinyin-toggle:hover { color: var(--blue); border-color: var(--blue); }
code { padding: .08rem .28rem; border-radius: 5px; background: var(--panel-3); color: var(--accent-strong); }


/* Checkpoint learning-flow refinements */
.quiz-feedback { display: flex; justify-content: space-between; align-items: center; gap: .75rem; }
.quiz-feedback > div { min-width: 0; }
.quiz-retry { flex: 0 0 auto; }
.completion-control { display: flex; flex-direction: column; align-items: flex-end; gap: .4rem; text-align: right; }
.playback-rates { justify-content: flex-end; }
.scene-notes .list { margin: .5rem 0 0; }
.advanced-support { padding: 0; overflow: hidden; }
.advanced-support > summary { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: 1rem 1.1rem; cursor: pointer; list-style: none; background: color-mix(in srgb, var(--blue) 5%, var(--panel)); }
.advanced-support > summary::-webkit-details-marker { display: none; }
.advanced-support > summary strong, .advanced-support > summary small { display: block; }
.advanced-support > summary small { margin-top: .25rem; color: var(--muted); font-weight: 400; }
.advanced-support[open] > summary { border-bottom: 1px solid var(--line); }
.advanced-support[open] > summary > span:last-child { transform: rotate(180deg); }
.dialogue-support-body { padding: 1rem 1.1rem 1.1rem; }
.dialogue-support-body > p { margin-top: 0; color: var(--muted); }
.dialogue-support .section-head p { max-width: 70ch; }

@media (max-width: 720px) {
  .dialogue-head { flex-direction: column; }
  .playback-rates { justify-content: flex-start; }
  .completion-control { width: 100%; align-items: stretch; text-align: left; }
  .quiz-feedback { align-items: flex-start; flex-direction: column; }
}

/* Stage 17 chosen-genre specialization lab */
.genre-track-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .85rem; }
.genre-track { width: 100%; text-align: left; color: var(--text); cursor: pointer; font: inherit; transition: .15s ease; }
.genre-track:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--line)); transform: translateY(-2px); }
.genre-track.selected { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 7%, var(--panel)); box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 16%, transparent); }
.genre-track-head { display: flex; justify-content: space-between; align-items: center; gap: .75rem; }
.genre-track h3 { margin-top: .75rem; }
.genre-track p { margin-bottom: .7rem; }
.genre-select-label { color: var(--accent-strong); font-size: .78rem; font-weight: 850; }
.genre-selected > .section-head { align-items: flex-end; }
.genre-progress { flex: 0 0 auto; min-width: 105px; padding: .7rem .8rem; text-align: center; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.genre-progress strong { display: block; font-size: 1.35rem; }
.genre-progress span { display: block; margin-top: .25rem; color: var(--muted); font-size: .7rem; }
.genre-context { margin-top: 1rem; }
.mini-link-list { display: grid; gap: .42rem; }
.mini-link { display: grid; grid-template-columns: 24px minmax(0, 1fr); gap: .45rem; align-items: start; padding: .45rem .55rem; border-radius: 8px; background: var(--panel-2); color: var(--muted); text-decoration: none; font-size: .8rem; line-height: 1.4; }
.mini-link:hover { color: var(--text); background: var(--panel-3); }
.mini-link.complete { color: var(--green); }
.genre-plan-head { margin-top: 1.4rem; align-items: flex-end; }
.genre-session-list { display: grid; gap: .55rem; }
.genre-session { display: grid; grid-template-columns: 42px minmax(0, 1fr); gap: .8rem; align-items: start; width: 100%; padding: .85rem; text-align: left; border: 1px solid var(--line); border-radius: 13px; background: var(--panel); color: var(--text); font: inherit; cursor: pointer; }
.genre-session:hover { border-color: color-mix(in srgb, var(--blue) 50%, var(--line)); }
.genre-session.done { border-color: color-mix(in srgb, var(--green) 55%, var(--line)); background: color-mix(in srgb, var(--green) 6%, var(--panel)); }
.genre-check { display: grid; place-items: center; width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 50%; color: var(--faint); font-size: .78rem; font-weight: 900; }
.genre-session.done .genre-check { border-color: var(--green); background: color-mix(in srgb, var(--green) 14%, var(--panel)); color: var(--green); }
.genre-session strong, .genre-session small, .genre-session em { display: block; }
.genre-session strong { margin-bottom: .25rem; }
.genre-session small { color: var(--muted); line-height: 1.5; }
.genre-session em { margin-top: .35rem; color: var(--faint); font-size: .73rem; line-height: 1.45; font-style: normal; }

@media (max-width: 760px) {
  .genre-track-grid { grid-template-columns: 1fr; }
  .genre-selected > .section-head, .genre-plan-head { align-items: flex-start; flex-direction: column; }
  .genre-progress { text-align: left; }
}


/* Stage 18 independent-viewing capstone */
.capstone-stats { margin-bottom: 1.25rem; }
.capstone-benchmark-grid { align-items: stretch; }
.capstone-benchmark { display: flex; flex-direction: column; gap: .65rem; min-height: 100%; }
.capstone-benchmark h3 { margin: 0; }
.capstone-benchmark p { flex: 1; margin: 0; color: var(--muted); line-height: 1.55; }
.capstone-gate-list { display: grid; gap: 1rem; }
.capstone-gate { transition: border-color .18s ease, background .18s ease; }
.capstone-gate.done { border-color: color-mix(in srgb, var(--green) 58%, var(--line)); background: color-mix(in srgb, var(--green) 5%, var(--panel)); }
.capstone-gate > p { color: var(--muted); line-height: 1.62; }
.capstone-gate .section-head { margin-bottom: .75rem; }
.capstone-note-label { display: grid; grid-template-columns: 130px minmax(0, 1fr); align-items: start; gap: 1rem; }
.capstone-note-label > span { padding-top: .7rem; font-weight: 800; }
.capstone-note { min-height: 128px; resize: vertical; }
.capstone-gate-foot { display: flex; justify-content: space-between; gap: 1rem; margin-top: .55rem; }
.success-text { color: var(--green); }
.capstone-diagnostic-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .85rem; }
.capstone-diagnostic { width: 100%; min-height: 190px; text-align: left; color: var(--text); font: inherit; cursor: pointer; }
.capstone-diagnostic:hover { border-color: color-mix(in srgb, var(--blue) 55%, var(--line)); transform: translateY(-1px); }
.capstone-diagnostic.selected { border-color: color-mix(in srgb, var(--blue) 62%, var(--line)); background: color-mix(in srgb, var(--blue) 7%, var(--panel)); }
.capstone-diagnostic h3 { margin: .55rem 0 .5rem; }
.capstone-diagnostic p { margin: .45rem 0 0; color: var(--muted); line-height: 1.55; }
.capstone-decision { display: grid; gap: 1rem; }
.capstone-decision .select { width: min(100%, 760px); }

@media (max-width: 760px) {
  .capstone-diagnostic-grid { grid-template-columns: 1fr; }
  .capstone-note-label { grid-template-columns: 1fr; gap: .35rem; }
  .capstone-note-label > span { padding-top: 0; }
  .capstone-gate-foot { align-items: flex-start; flex-direction: column; }
  .capstone-gate .section-head { align-items: flex-start; flex-direction: column; }
}

/* R4 Hanzi Literacy Lab */
.hanzi-deck-btn { min-width: 40px; height: 30px; display: grid; place-items: center; padding: 0 .4rem; border: 1px solid var(--line); border-radius: 8px; background: var(--panel-2); color: var(--muted); cursor: pointer; font-size: .72rem; font-weight: 900; }
.hanzi-deck-btn:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--line)); color: var(--text); }
.hanzi-deck-btn.active { border-color: var(--green); background: color-mix(in srgb, var(--green) 11%, var(--panel-2)); color: var(--green); }
.vocab-card .card-actions, .freq-card .card-actions { gap: .35rem; }
.compact-number { max-width: 118px; }
.textarea.compact { min-height: 82px; }
.small-callout { padding: .7rem .8rem; font-size: .78rem; }

.hanzi-tabs { display: flex; gap: .45rem; margin: -.2rem 0 1.25rem; padding: .45rem; overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); scrollbar-width: thin; }
.hanzi-tab { flex: 0 0 auto; padding: .55rem .72rem; border: 1px solid transparent; border-radius: 9px; color: var(--muted); text-decoration: none; font-size: .78rem; font-weight: 800; white-space: nowrap; }
.hanzi-tab:hover { color: var(--text); background: var(--panel-2); }
.hanzi-tab.active { border-color: color-mix(in srgb, var(--accent) 46%, var(--line)); background: color-mix(in srgb, var(--accent) 12%, var(--panel)); color: var(--accent-strong); }
.hanzi-stats { margin-bottom: 1rem; }
.hanzi-tool-grid .card { min-height: 168px; }
.hanzi-filter { align-items: center; }

.component-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.component-card { display: flex; flex-direction: column; gap: .75rem; }
.component-card.studied { border-color: color-mix(in srgb, var(--green) 52%, var(--line)); background: color-mix(in srgb, var(--green) 4%, var(--panel)); }
.component-card-head { display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: .9rem; align-items: center; }
.component-card-head h3 { margin: .35rem 0 .25rem; }
.component-card-head p { margin: 0; }
.component-glyph { display: grid; place-items: center; width: 42px; min-height: 42px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel-2); color: var(--accent-strong); font-size: 1.6rem; font-weight: 850; }
.component-glyph.large { width: 72px; min-height: 72px; border-radius: 14px; font-size: 2.55rem; }
.component-examples { display: grid; gap: .45rem; }
.component-example { display: grid; grid-template-columns: minmax(72px, auto) minmax(110px, .7fr) minmax(0, 1fr) auto; gap: .65rem; align-items: center; padding: .62rem .7rem; border-radius: 10px; background: var(--panel-2); }
.component-example .hanzi-line { font-size: 1.08rem; font-weight: 800; }

.family-card { display: flex; flex-direction: column; gap: .8rem; }
.family-card.studied { border-color: color-mix(in srgb, var(--green) 52%, var(--line)); background: color-mix(in srgb, var(--green) 4%, var(--panel)); }
.family-members { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .5rem; }
.family-member { position: relative; min-height: 100px; padding: .7rem 2.5rem .7rem .75rem; border: 1px solid var(--line); border-radius: 11px; background: var(--panel-2); }
.family-member strong, .family-member span { display: block; }
.family-member strong { font-size: 1.2rem; }
.family-member .pinyin { margin-top: .25rem; }
.family-member small { display: block; margin-top: .25rem; color: var(--muted); line-height: 1.35; }
.family-member .audio-btn { position: absolute; top: .55rem; right: .55rem; }

.hanzi-lens { overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); }
.hanzi-lens summary { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .9rem 1rem; cursor: pointer; list-style: none; }
.hanzi-lens summary::-webkit-details-marker { display: none; }
.hanzi-lens summary strong, .hanzi-lens summary small { display: block; }
.hanzi-lens summary small { margin-top: .2rem; color: var(--muted); font-size: .76rem; }
.hanzi-lens[open] summary { border-bottom: 1px solid var(--line); }
.hanzi-lens-body { padding: 1rem; }
.hanzi-lens-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .65rem; margin-bottom: .9rem; }
.hanzi-lens-item { display: grid; grid-template-columns: 46px minmax(0, 1fr); gap: .7rem; align-items: center; padding: .65rem; border-radius: 11px; background: var(--panel-2); }
.hanzi-lens-item strong, .hanzi-lens-item small { display: block; }
.hanzi-lens-item small { margin-top: .2rem; color: var(--muted); line-height: 1.35; }

.mnemonic-box { margin-top: 1rem; padding: .9rem; border: 1px dashed color-mix(in srgb, var(--purple) 44%, var(--line)); border-radius: 13px; background: color-mix(in srgb, var(--purple) 5%, var(--panel-2)); text-align: left; }
.mnemonic-head { display: flex; align-items: center; justify-content: space-between; gap: .7rem; }
.mnemonic-box p { margin: .55rem 0; }
.mnemonic-box .setting-row { margin-top: .75rem; }

.hanzi-review-card { max-width: 760px; }
.hanzi-review-front { display: grid; place-items: center; min-height: 220px; margin: 1rem 0; padding: 1rem; border: 1px dashed var(--line); border-radius: 16px; background: radial-gradient(circle, color-mix(in srgb, var(--accent) 8%, var(--panel)), var(--panel)); }
.hanzi-review-front .hanzi.giant { font-size: clamp(3.2rem, 10vw, 6.5rem); line-height: 1.05; }
.hanzi-review-back { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.hanzi-review-back > .hanzi { font-size: clamp(2.3rem, 7vw, 4.5rem); }
.hanzi-audio-prompt { display: grid; place-items: center; gap: .8rem; }
.hanzi-audio-stage { display: grid; place-items: center; min-height: 170px; margin: 1rem 0; padding: 1rem; border: 1px dashed var(--line); border-radius: 14px; background: radial-gradient(circle, color-mix(in srgb, var(--blue) 11%, var(--panel)), var(--panel)); text-align: center; }
.hanzi-audio-stage .audio-btn, .hanzi-audio-prompt .audio-btn { width: 76px; height: 76px; border-radius: 50%; font-size: 1.45rem; }
.hanzi-cloze { padding: 1.2rem; border-radius: 14px; background: var(--panel-2); font-size: clamp(1.25rem, 3vw, 1.8rem); line-height: 1.65; text-align: left; }
.hanzi-answer-input { max-width: 560px; margin: .85rem auto; font-size: 1.15rem; text-align: center; }
.typing-card { max-width: 760px; margin-inline: auto; text-align: center; }
.typing-card .mnemonic-box { text-align: left; }

.hanzi-drill-chips { display: flex; gap: .4rem; margin-bottom: .9rem; padding-bottom: .35rem; overflow-x: auto; scrollbar-width: thin; }
.hanzi-drill-chip { flex: 0 0 auto; padding: .45rem .62rem; border: 1px solid var(--line); border-radius: 999px; background: var(--panel); color: var(--muted); cursor: pointer; font: inherit; font-size: .72rem; font-weight: 800; }
.hanzi-drill-chip:hover { color: var(--text); }
.hanzi-drill-chip.active { border-color: var(--accent); color: var(--accent-strong); }
.hanzi-drill-chip.complete::before { content: "✓ "; color: var(--green); }
.speed-card { overflow: hidden; }
.speed-stage { min-height: 205px; display: grid; place-items: center; padding: clamp(1rem, 4vw, 2rem); border: 1px dashed var(--line); border-radius: 15px; background: var(--panel-2); font-size: clamp(1.55rem, 5vw, 3rem); font-weight: 800; line-height: 1.45; text-align: center; }
.speed-stage.ready, .speed-stage.hidden-stage { font-size: 1rem; font-weight: 500; color: var(--muted); }
.speed-stage.ready p { max-width: 520px; }
.speed-stage.hidden-stage strong, .speed-stage.hidden-stage span { display: block; }
.danmu-burst { display: flex; flex-wrap: wrap; align-content: center; justify-content: center; gap: .65rem 1.1rem; }
.danmu-burst span { padding: .2rem .4rem; white-space: nowrap; }
.font-variation-1 { font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif; }
.font-variation-2 { font-family: "Noto Serif SC", SimSun, serif; font-weight: 700; }
.font-variation-3 { font-family: KaiTi, STKaiti, "Noto Serif SC", serif; }
.font-variation-4 { letter-spacing: .06em; font-weight: 900; }
.speed-options { margin-top: .85rem; }
.segmentation-card { max-width: 850px; margin-inline: auto; }
.speed-hanzi { margin: .8rem 0; padding: 1rem; border-radius: 12px; background: var(--panel-2); font-size: clamp(1.35rem, 4vw, 2.2rem); font-weight: 800; line-height: 1.55; text-align: center; }

.confusable-layout { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 1rem; align-items: start; }
.confusable-sidebar { display: grid; gap: .45rem; max-height: 72vh; overflow-y: auto; padding-right: .25rem; }
.confusable-set { display: block; width: 100%; padding: .7rem .75rem; text-align: left; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); color: var(--text); cursor: pointer; font: inherit; }
.confusable-set strong, .confusable-set small { display: block; }
.confusable-set small { margin-top: .25rem; color: var(--muted); }
.confusable-set.active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, var(--panel)); }
.confusable-practice { min-height: 420px; }
.confusable-prompt { margin: 1rem 0; padding: 1.1rem; border-radius: 13px; background: var(--panel-2); font-size: clamp(1.35rem, 4vw, 2.2rem); font-weight: 800; line-height: 1.55; text-align: center; }
.confusable-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; margin-bottom: .9rem; }
.confusable-option { min-height: 74px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel-2); color: var(--text); cursor: pointer; font: inherit; font-size: 1.65rem; font-weight: 850; }
.confusable-option:hover { border-color: var(--blue); }
.confusable-option.correct { border-color: var(--green); background: color-mix(in srgb, var(--green) 10%, var(--panel)); }
.confusable-option.incorrect { border-color: var(--red); background: color-mix(in srgb, var(--red) 10%, var(--panel)); }

.writing-lab { max-width: 920px; margin-inline: auto; }
.writing-mode-tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin: .8rem 0 1rem; }
.writing-workspace { display: grid; grid-template-columns: minmax(180px, .55fr) minmax(280px, 1fr); gap: 1rem; align-items: stretch; }
.writing-reference { min-height: 280px; display: grid; place-items: center; align-content: center; padding: 1rem; border: 1px solid var(--line); border-radius: 15px; background: var(--panel-2); text-align: center; }
.writing-reference span { font-size: clamp(6rem, 15vw, 10rem); line-height: 1; font-weight: 700; }
.writing-reference small { display: block; max-width: 230px; margin-top: 1rem; color: var(--muted); line-height: 1.45; }
.hidden-reference span { color: var(--faint); }
.hanzi-canvas { width: min(100%, 520px); height: auto; justify-self: center; border: 1px solid var(--line); border-radius: 15px; background: var(--panel-2); touch-action: none; cursor: crosshair; }
.writing-self-grade { margin-top: 1rem; padding: .9rem; border-radius: 12px; background: var(--panel-2); }

@media (max-width: 900px) {
  .component-grid { grid-template-columns: 1fr; }
  .confusable-layout { grid-template-columns: 1fr; }
  .confusable-sidebar { grid-template-columns: repeat(2, minmax(0, 1fr)); max-height: none; overflow: visible; }
  .writing-workspace { grid-template-columns: 1fr; }
  .writing-reference { min-height: 200px; }
  .writing-reference span { font-size: 7rem; }
}

@media (max-width: 660px) {
  .hanzi-tabs { margin-inline: -.25rem; }
  .component-card-head { grid-template-columns: 58px minmax(0, 1fr); }
  .component-glyph.large { width: 58px; min-height: 58px; font-size: 2rem; }
  .component-example { grid-template-columns: minmax(58px, auto) minmax(90px, 1fr) auto; }
  .component-example > :nth-child(3) { grid-column: 1 / -1; }
  .family-members, .hanzi-lens-grid, .confusable-options, .confusable-sidebar { grid-template-columns: 1fr; }
  .speed-stage { min-height: 165px; }
  .writing-lab > .section-head { align-items: flex-start; flex-direction: column; }
  .writing-mode-tabs .btn { flex: 1 1 100%; }
}