/* Page-level styles. */

/* ---------- Home ---------- */
.hero { position: relative; overflow: hidden; padding: var(--space-16) 0 var(--space-20); }
.hero::before { content: ""; position: absolute; inset: -40% -10% auto auto; width: 720px; height: 720px; background: radial-gradient(circle, color-mix(in srgb, var(--color-accent) 22%, transparent), transparent 65%); pointer-events: none; }
.hero::after { content: ""; position: absolute; inset: auto auto -50% -15%; width: 640px; height: 640px; background: radial-gradient(circle, color-mix(in srgb, var(--color-primary) 18%, transparent), transparent 65%); pointer-events: none; }
.hero-grid { position: relative; z-index: 1; display: grid; gap: var(--space-12); align-items: center; }
@media (min-width: 1024px) { .hero-grid { grid-template-columns: 1.1fr 1fr; } }
.hero-title { font-size: var(--text-hero); font-weight: 850; letter-spacing: -0.035em; margin-bottom: var(--space-5); }
.hero-lead { font-size: var(--text-lg); color: var(--color-text-2); max-width: 560px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: var(--space-3); margin: var(--space-8) 0; }
.hero-trust { display: flex; flex-wrap: wrap; gap: var(--space-8); list-style: none; padding: 0; margin: 0; min-height: 52px; }
.hero-trust li { display: flex; flex-direction: column; }
.hero-trust strong { font-size: var(--text-2xl); font-weight: 800; }
.hero-trust span { font-size: var(--text-sm); color: var(--color-muted); }
.hero-visual { position: relative; max-width: 520px; width: 100%; justify-self: center; }
.mock-window { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); padding: var(--space-4); display: grid; gap: var(--space-3); }
.mock-bar { display: flex; gap: 6px; }
.mock-bar i { width: 10px; height: 10px; border-radius: 50%; background: var(--color-border-strong); }
.mock-bar i:first-child { background: #f87171; } .mock-bar i:nth-child(2) { background: #fbbf24; } .mock-bar i:nth-child(3) { background: #4ade80; }
.mock-video { aspect-ratio: 16 / 9; border-radius: var(--radius-lg); background: var(--gradient-brand); display: grid; place-items: center; color: #fff; }
.mock-row { display: flex; justify-content: space-between; font-size: var(--text-sm); }
.mock-chips { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.float-card { position: absolute; display: flex; align-items: center; gap: var(--space-2); padding: var(--space-3) var(--space-4); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); font-size: var(--text-sm); font-weight: 650; animation: float 6s ease-in-out infinite; }
.float-card .icon { color: var(--color-primary); }
.fc-1 { left: -24px; bottom: 24%; } .fc-2 { right: -16px; top: 14%; animation-delay: -3s; }
@keyframes float { 50% { transform: translateY(-10px); } }
@media (max-width: 639px) { .float-card { display: none; } .hero { padding-top: var(--space-10); } }
@media (prefers-reduced-motion: reduce) { .float-card { animation: none; } }

.grid-features { display: grid; gap: var(--space-5); grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid-features { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .grid-features { grid-template-columns: repeat(3, 1fr); } .grid-features.cols-4 { grid-template-columns: repeat(4, 1fr); } }
.feature { padding: var(--space-6); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease); }
.feature:hover { border-color: color-mix(in srgb, var(--color-primary) 40%, var(--color-border)); transform: translateY(-2px); }
.feature p { color: var(--color-muted); font-size: var(--text-sm); margin: 0; }
.feature-icon { display: inline-grid; place-items: center; width: 48px; height: 48px; border-radius: var(--radius-md); background: var(--color-primary-soft); color: var(--color-primary); margin-bottom: var(--space-4); }

.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-5); grid-template-columns: 1fr; counter-reset: s; }
@media (min-width: 640px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .steps { grid-template-columns: repeat(4, 1fr); } }
.step { position: relative; padding: var(--space-6); border-radius: var(--radius-lg); background: var(--color-surface); border: 1px solid var(--color-border); }
.step-n { display: block; font-size: var(--text-3xl); font-weight: 850; line-height: 1; margin-bottom: var(--space-3); background: var(--gradient-brand); -webkit-background-clip: text; background-clip: text; color: transparent; }
.step p { margin: 0; color: var(--color-muted); font-size: var(--text-sm); }

.founder-quote { margin: 0 auto; max-width: 820px; text-align: center; display: flex; flex-direction: column; align-items: center; gap: var(--space-4); }
.founder-avatar { width: 96px; height: 96px; border-radius: 50%; box-shadow: var(--shadow-md); }
.founder-quote blockquote { margin: 0; }
.founder-quote blockquote p { font-size: var(--text-2xl); font-weight: 600; line-height: 1.4; color: var(--color-text); margin: 0; }
.founder-quote figcaption { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.founder-quote figcaption span { color: var(--color-muted); font-size: var(--text-sm); }
.link-arrow { display: inline-flex; align-items: center; gap: var(--space-1); margin-top: var(--space-2); font-weight: 600; text-decoration: none; }
@media (max-width: 639px) { .founder-quote blockquote p { font-size: var(--text-lg); } }

.cta-band { display: flex; justify-content: space-between; align-items: center; gap: var(--space-6); flex-wrap: wrap; padding: var(--space-10); border-radius: var(--radius-xl); background: linear-gradient(135deg, #1d4ed8, #6d28d9); color: #fff; }
.cta-band h2, .cta-band p { color: #fff; margin: 0; }
.cta-band p { opacity: 0.9; margin-top: var(--space-2); }
@media (max-width: 639px) { .cta-band { padding: var(--space-6); } .cta-band .btn { width: 100%; } }

/* ---------- About ---------- */
.about-hero { padding: var(--space-16) 0 var(--space-12); text-align: center; }
.about-hero h1 { font-size: var(--text-hero); max-width: 900px; margin: 0 auto var(--space-5); letter-spacing: -0.03em; }
.about-hero .lead { max-width: 720px; margin: 0 auto; }
.mv-grid { display: grid; gap: var(--space-6); grid-template-columns: 1fr; }
@media (min-width: 768px) { .mv-grid { grid-template-columns: 1fr 1fr; } }
.mv-card { padding: var(--space-8); border-radius: var(--radius-xl); background: var(--color-surface); border: 1px solid var(--color-border); }
.mv-card p { color: var(--color-text-2); margin: 0; font-size: var(--text-lg); }
.founder { display: grid; gap: var(--space-10); align-items: center; }
@media (min-width: 900px) { .founder { grid-template-columns: 340px 1fr; } }
.founder-photo { position: relative; max-width: 340px; justify-self: center; }
.founder-photo img { width: 100%; height: auto; border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); }
.founder-tag { position: absolute; left: var(--space-4); right: var(--space-4); bottom: calc(-1 * var(--space-5)); padding: var(--space-3) var(--space-4); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); display: flex; flex-direction: column; text-align: center; }
.founder-tag span { font-size: var(--text-sm); color: var(--color-muted); }
.founder-body p { color: var(--color-text-2); }
.founder-big-quote { margin: var(--space-6) 0 0; padding: var(--space-5) var(--space-6); border-left: 4px solid var(--color-primary); background: var(--color-primary-soft); border-radius: 0 var(--radius-lg) var(--radius-lg) 0; }
.founder-big-quote p { font-size: var(--text-xl); font-weight: 600; color: var(--color-text); margin-bottom: var(--space-2); }
.founder-big-quote cite { font-style: normal; color: var(--color-muted); font-size: var(--text-sm); }
.timeline { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-5); position: relative; }
.timeline::before { content: ""; position: absolute; left: 47px; top: 8px; bottom: 8px; width: 2px; background: var(--color-border); }
.timeline li { display: grid; grid-template-columns: 96px 1fr; gap: var(--space-5); position: relative; }
.timeline p { color: var(--color-muted); margin: 0; }
.tl-year { position: relative; z-index: 1; align-self: start; justify-self: center; padding: 4px 10px; border-radius: var(--radius-full); background: var(--color-primary); color: var(--color-on-primary); font-weight: 700; font-size: var(--text-sm); white-space: nowrap; }
.team { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-5); grid-template-columns: repeat(2, 1fr); }
@media (min-width: 1024px) { .team { grid-template-columns: repeat(4, 1fr); } }
.team-card { display: flex; flex-direction: column; align-items: center; text-align: center; gap: var(--space-2); padding: var(--space-6) var(--space-4); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); }
.team-card span { color: var(--color-muted); font-size: var(--text-sm); }
.commit { max-width: 760px; margin: 0 auto; }
.contact-line { display: flex; align-items: center; gap: var(--space-2); margin-top: var(--space-6); }

/* ---------- Catalog ---------- */
.filters { display: grid; gap: var(--space-3); grid-template-columns: 1fr; margin-bottom: var(--space-6); }
@media (min-width: 768px) { .filters { grid-template-columns: 2fr 1fr 1fr 1fr; } }
.search-box { position: relative; }
.search-box .icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--color-muted); pointer-events: none; }
.search-box .input { padding-left: 40px; }
.result-count { color: var(--color-muted); font-size: var(--text-sm); }
.pagination { display: flex; justify-content: center; align-items: center; gap: var(--space-4); margin-top: var(--space-8); }

/* ---------- Course detail ---------- */
.course-hero { padding: var(--space-10) 0; background: linear-gradient(180deg, color-mix(in srgb, var(--course-color, #2563eb) 12%, var(--color-background)), var(--color-background)); border-bottom: 1px solid var(--color-border); }
.course-hero-grid { display: grid; gap: var(--space-8); align-items: start; }
@media (min-width: 1024px) { .course-hero-grid { grid-template-columns: 1fr 360px; } }
.instructor { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-3); }
.instructor div { display: flex; flex-direction: column; font-size: var(--text-sm); }
.instructor span { color: var(--color-muted); }
.cta-box { display: flex; flex-direction: column; gap: var(--space-3); padding: var(--space-6); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-xl); box-shadow: var(--shadow-md); }
.cta-box p { margin: 0; }
@media (min-width: 1024px) { .cta-box { position: sticky; top: calc(var(--header-h) + var(--space-6)); } }
.course-content { display: grid; gap: var(--space-10); max-width: 900px; margin: 0; }
@media (min-width: 1024px) { .course-content { margin-left: max(var(--space-6), calc((100vw - var(--container)) / 2 + var(--space-6))); } }
.curriculum { display: grid; gap: var(--space-3); }
.subject { border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface); overflow: hidden; }
.subject > summary { display: flex; justify-content: space-between; align-items: center; gap: var(--space-3); padding: var(--space-4) var(--space-5); cursor: pointer; font-weight: 700; list-style: none; min-height: var(--touch); }
.subject > summary::-webkit-details-marker { display: none; }
.subject > summary span { display: flex; flex-direction: column; }
.subject > summary small { font-size: var(--text-xs); color: var(--color-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }
.subject[open] > summary .icon { transform: rotate(180deg); }
.subject > summary .icon { transition: transform var(--dur) var(--ease); }
.chapter { padding: 0 var(--space-5) var(--space-4); }
.chapter h3 { font-size: var(--text-sm); color: var(--color-muted); margin: var(--space-2) 0; }
.lesson-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 2px; }
.lesson-row { display: flex; align-items: center; gap: var(--space-3); min-height: var(--touch); padding: var(--space-2) var(--space-3); border-radius: var(--radius-md); color: var(--color-text); text-decoration: none; font-size: var(--text-sm); }
a.lesson-row:hover { background: var(--color-surface-2); color: var(--color-text); }
.lesson-row.locked { color: var(--color-muted); }
.lesson-name { flex: 1; min-width: 0; }
.lesson-ico { color: var(--color-muted); display: inline-flex; }
.lesson-ico.done { color: var(--color-success); }
.lesson-dur { color: var(--color-muted); font-variant-numeric: tabular-nums; font-size: var(--text-xs); }
.lesson-ex, .lesson-lock { color: var(--color-muted); display: inline-flex; }

/* ---------- Learn ---------- */
.learn { display: grid; grid-template-columns: 1fr; min-height: calc(100vh - var(--header-h)); }
@media (min-width: 1024px) { .learn { grid-template-columns: var(--sidebar-w) 1fr; } }
.learn-sidebar { background: var(--color-surface); border-right: 1px solid var(--color-border); }
@media (min-width: 1024px) { .learn-sidebar { position: sticky; top: var(--header-h); height: calc(100vh - var(--header-h)); overflow-y: auto; } }
@media (max-width: 1023px) {
  .learn-sidebar { position: fixed; z-index: var(--z-drawer); top: 0; bottom: 0; left: 0; width: min(320px, 88vw); transform: translateX(-100%); transition: transform var(--dur) var(--ease); overflow-y: auto; box-shadow: var(--shadow-lg); padding-top: env(safe-area-inset-top); }
  .learn-sidebar.open { transform: none; }
}
.outline { padding: var(--space-4); }
.outline-course { display: flex; align-items: center; gap: var(--space-1); font-weight: 700; color: var(--color-text); text-decoration: none; margin-bottom: var(--space-4); font-size: var(--text-sm); }
.outline h2 { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-muted); margin: var(--space-4) 0 var(--space-2); }
.outline h3 { font-size: var(--text-sm); margin: var(--space-2) 0 var(--space-1); color: var(--color-text-2); }
.outline ul { list-style: none; padding: 0; margin: 0; }
.outline a, .outline .locked { display: flex; align-items: center; gap: var(--space-2); min-height: 40px; padding: var(--space-2); border-radius: var(--radius-md); font-size: var(--text-sm); color: var(--color-text-2); text-decoration: none; }
.outline a:hover { background: var(--color-surface-2); }
.outline a.current { background: var(--color-primary-soft); color: var(--color-primary); font-weight: 650; }
.outline .locked { color: var(--color-muted); }
.learn-main { padding: var(--space-6) var(--space-4) var(--space-16); max-width: 960px; width: 100%; margin: 0 auto; min-width: 0; }
@media (min-width: 768px) { .learn-main { padding-left: var(--space-8); padding-right: var(--space-8); } }
.learn-topbar { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; margin-bottom: var(--space-2); }
.learn-topbar .breadcrumb { margin: 0; flex: 1; }
.learn-title { font-size: var(--text-3xl); margin-bottom: var(--space-5); }
.learn-media:empty { display: none; }
.video-wrap { margin-bottom: var(--space-6); }
.video-frame { position: relative; aspect-ratio: 16 / 9; background: #000; border-radius: var(--radius-lg); overflow: hidden; }
.video-stage, .video-stage > div, .video-stage iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-panel { margin-top: var(--space-3); padding: var(--space-4); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); display: grid; gap: var(--space-2); }
.video-panel-row { display: flex; justify-content: space-between; gap: var(--space-3); flex-wrap: wrap; font-size: var(--text-sm); }
.video-panel-row span { display: inline-flex; align-items: center; gap: 6px; color: var(--color-muted); }
.video-panel-row strong { font-variant-numeric: tabular-nums; }
.video-status { margin: 0; font-size: var(--text-sm); color: var(--color-muted); }
.video-status.ok { color: var(--color-success); font-weight: 600; }
.video-status.warn { color: var(--color-warning); font-weight: 600; }
.sim-player { position: absolute; inset: 0; display: flex; flex-direction: column; background: linear-gradient(135deg, #1e293b, #312e81); color: #fff; }
.sim-screen { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: var(--space-3); padding: var(--space-4); text-align: center; }
.sim-art { width: 88px; height: 88px; border-radius: 50%; background: rgba(255,255,255,0.12); display: grid; place-items: center; }
.sim-note { font-size: var(--text-xs); opacity: 0.8; max-width: 520px; margin: 0; }
.sim-controls { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-2) var(--space-3); background: rgba(0,0,0,0.45); }
.sim-play { width: var(--touch); height: var(--touch); border-radius: 50%; border: 0; background: #fff; color: #1e293b; display: grid; place-items: center; flex-shrink: 0; }
.sim-time { font-size: var(--text-xs); font-variant-numeric: tabular-nums; white-space: nowrap; }
.sim-seek { flex: 1; min-width: 60px; accent-color: #60a5fa; }
.sim-rate { background: rgba(255,255,255,0.15); color: #fff; border: 0; border-radius: var(--radius-sm); padding: 4px; font-size: var(--text-xs); }
.sim-rate option { color: #0f172a; }
@media (max-width: 479px) { .sim-note { display: none; } .sim-time { display: none; } }
.reading { margin-bottom: var(--space-6); }
.prose { font-size: var(--text-lg); color: var(--color-text-2); max-width: 72ch; }
.prose h3 { font-size: var(--text-xl); margin-top: var(--space-6); color: var(--color-text); }
.prose pre { font-size: var(--text-sm); }
.prose li { margin-bottom: var(--space-1); }
.complete-box { display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; padding: var(--space-5); margin-top: var(--space-6); border: 1px dashed var(--color-border-strong); border-radius: var(--radius-lg); }
.ex-list { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-2); }
.ex-item { display: grid; grid-template-columns: auto 1fr auto; grid-template-areas: "type title arrow" "type meta arrow"; column-gap: var(--space-3); align-items: center; padding: var(--space-3) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); color: var(--color-text); text-decoration: none; }
a.ex-item:hover { border-color: var(--color-primary); color: var(--color-text); }
.ex-item.locked { opacity: 0.75; grid-template-areas: "type title" "type meta" "type lock"; grid-template-columns: auto 1fr; }
.ex-item .ex-type { grid-area: type; }
.ex-item strong { grid-area: title; }
.ex-item > .muted:nth-of-type(1) { grid-area: meta; }
.ex-item > .icon { grid-area: arrow; }
.ex-type { font-size: var(--text-xs); font-weight: 700; padding: 4px 8px; border-radius: var(--radius-sm); background: var(--color-primary-soft); color: var(--color-primary); }
.lesson-nav { display: flex; justify-content: space-between; gap: var(--space-3); margin-top: var(--space-8); padding-top: var(--space-6); border-top: 1px solid var(--color-border); }

/* ---------- Exercise ---------- */
.exercise-layout { display: grid; gap: var(--space-8); }
@media (min-width: 1024px) { .exercise-layout { grid-template-columns: 1fr 340px; align-items: start; } .exercise-side { position: sticky; top: calc(var(--header-h) + var(--space-6)); } }
.ex-meta { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-5); font-size: var(--text-sm); color: var(--color-muted); margin-bottom: var(--space-6); }
.ex-meta span { display: inline-flex; align-items: center; gap: 6px; }
.quiz { display: grid; gap: var(--space-4); }
.question { margin: 0; padding: var(--space-5); border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface); min-width: 0; }
.question.invalid { border-color: var(--color-danger); box-shadow: 0 0 0 3px var(--color-danger-soft); }
.question legend { float: left; width: 100%; font-weight: 650; margin-bottom: var(--space-4); padding: 0; }
.question legend + * { clear: both; }
.q-num { display: block; font-size: var(--text-xs); color: var(--color-primary); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: var(--space-1); }
.options { display: grid; gap: var(--space-2); }
.option { display: flex; align-items: center; gap: var(--space-3); min-height: var(--touch); padding: var(--space-2) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); cursor: pointer; }
.option:hover { background: var(--color-surface-2); }
.option:has(input:checked) { border-color: var(--color-primary); background: var(--color-primary-soft); }
.option input { width: 18px; height: 18px; accent-color: var(--color-primary); flex-shrink: 0; }
.quiz-actions { display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; }
.sub-list { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-3); }
.sub-item { padding: var(--space-3); border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.sub-item p { margin: var(--space-1) 0 0; }
.score strong { font-size: var(--text-xl); }
.feedback { display: flex; gap: var(--space-2); margin: var(--space-2) 0 0; padding: var(--space-2) var(--space-3); background: var(--color-surface-2); border-radius: var(--radius-sm); font-size: var(--text-sm); }
.answer-key { padding-left: 0; list-style: none; display: grid; gap: var(--space-1); font-size: var(--text-sm); margin-bottom: var(--space-4); }
.solution-body .prose { font-size: var(--text-base); }

/* ---------- Grading ---------- */
.grading { display: grid; gap: var(--space-3); margin-bottom: var(--space-4); }
.answer { padding: var(--space-3); border-radius: var(--radius-md); background: var(--color-surface-2); }
.answer-q { font-weight: 600; font-size: var(--text-sm); margin: 0 0 var(--space-1); }
.answer-a { font-size: var(--text-sm); white-space: pre-wrap; overflow-wrap: anywhere; }
.teacher-courses { display: grid; gap: var(--space-2); }
.lesson-admin summary { cursor: pointer; font-weight: 600; min-height: var(--touch); display: flex; align-items: center; }

/* ---------- Auth ---------- */
.auth-page { display: flex; justify-content: center; align-items: flex-start; gap: var(--space-8); flex-wrap: wrap; padding: var(--space-10) var(--space-4) var(--space-16); }
.auth-card { width: min(440px, 100%); padding: var(--space-8); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-xl); box-shadow: var(--shadow-md); }
.auth-card h1 { font-size: var(--text-2xl); text-align: center; margin-bottom: var(--space-1); }
.auth-card > .muted { text-align: center; margin-bottom: var(--space-6); }
@media (max-width: 479px) { .auth-card { padding: var(--space-6) var(--space-4); } }
.divider { display: flex; align-items: center; gap: var(--space-3); color: var(--color-muted); font-size: var(--text-xs); margin: var(--space-5) 0; }
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--color-border); }
.g-mark { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: var(--color-surface-2); font-weight: 800; color: #ea4335; }
.demo-box { width: min(360px, 100%); padding: var(--space-6); background: var(--color-surface); border: 1px dashed var(--color-border-strong); border-radius: var(--radius-xl); }
.demo-box h2 { display: flex; align-items: center; gap: var(--space-2); font-size: var(--text-lg); }
.demo-box ul { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-2); }
.demo-btn { display: flex; align-items: center; gap: var(--space-3); width: 100%; min-height: 52px; padding: var(--space-2) var(--space-3); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-background); text-align: left; }
.demo-btn:hover { border-color: var(--color-primary); }
.demo-btn span { display: flex; flex-direction: column; min-width: 0; }
.demo-btn small { color: var(--color-muted); overflow: hidden; text-overflow: ellipsis; }

/* ---------- Dashboard ---------- */
.continue-card { display: flex; justify-content: space-between; align-items: center; gap: var(--space-6); flex-wrap: wrap; padding: var(--space-6); margin-bottom: var(--space-6); border-radius: var(--radius-xl); color: #fff; background: linear-gradient(135deg, var(--course-color, #2563eb), color-mix(in srgb, var(--course-color, #2563eb) 50%, #0f172a)); }
.continue-card > div { flex: 1; min-width: 220px; }
.continue-card h2, .continue-card p, .continue-card .eyebrow { color: #fff; }
.continue-card .progress { background: rgba(255,255,255,0.25); max-width: 420px; }
.continue-card .progress-fill { background: #fff; }
.dash-grid { display: grid; gap: var(--space-6); }
@media (min-width: 1024px) { .dash-grid { grid-template-columns: 1fr 360px; align-items: start; } }
.dash-side .panel { margin-bottom: var(--space-4); }
.task-list, .grade-list { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-2); }
.task { display: flex; flex-direction: column; gap: var(--space-1); padding: var(--space-3); border: 1px solid var(--color-border); border-radius: var(--radius-md); color: var(--color-text); text-decoration: none; }
.task:hover { border-color: var(--color-primary); color: var(--color-text); }
.task-title { font-weight: 600; font-size: var(--text-sm); }
.task-meta { display: flex; justify-content: space-between; align-items: center; gap: var(--space-2); flex-wrap: wrap; }
.grade-list li { display: flex; justify-content: space-between; align-items: center; gap: var(--space-3); padding: var(--space-2) 0; border-bottom: 1px solid var(--color-border); font-size: var(--text-sm); }
.grade-list li:last-child { border-bottom: 0; }

/* ---------- Notifications ---------- */
.notif-list { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-2); }
.notif { display: grid; grid-template-columns: auto 1fr auto; gap: var(--space-3); align-items: start; padding: var(--space-4); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); }
.notif.unread { border-left: 4px solid var(--color-primary); }
.notif p { margin: var(--space-1) 0; font-size: var(--text-sm); color: var(--color-text-2); }
.notif-icon { display: grid; place-items: center; width: 40px; height: 40px; border-radius: var(--radius-full); background: var(--color-primary-soft); color: var(--color-primary); }

/* ---------- Admin ---------- */
.bar-chart { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-3); }
.bar-chart li { display: grid; grid-template-columns: minmax(120px, 2fr) 3fr auto; gap: var(--space-3); align-items: center; font-size: var(--text-sm); }
.bar-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar-track { height: 10px; border-radius: var(--radius-full); background: var(--color-surface-2); overflow: hidden; }
.bar-fill { height: 100%; background: var(--gradient-brand); border-radius: inherit; }
.bar-value { color: var(--color-muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
@media (max-width: 639px) { .bar-chart li { grid-template-columns: 1fr auto; } .bar-track { grid-column: 1 / -1; grid-row: 2; } }
.log-list { list-style: none; padding: 0; margin: 0; display: grid; font-size: var(--text-sm); }
.log-list li { display: grid; grid-template-columns: 200px 1fr 1fr auto; gap: var(--space-3); padding: var(--space-2) 0; border-bottom: 1px solid var(--color-border); align-items: center; }
.log-list li > * { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@media (max-width: 767px) { .log-list li { grid-template-columns: 1fr auto; } .log-list li > span:nth-of-type(2) { display: none; } }

/* ---------- Anti-seek player (prom3 §B) ---------- */
.video-frame { position: relative; }
.pc-bar { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-3); margin-top: var(--space-2); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); }
.pc-btn { display: grid; place-items: center; width: var(--touch); height: var(--touch); flex-shrink: 0; border: 0; border-radius: var(--radius-md); background: transparent; color: var(--color-text); }
.pc-btn:hover { background: var(--color-surface-2); }
.pc-time { font-size: var(--text-xs); font-variant-numeric: tabular-nums; white-space: nowrap; color: var(--color-text-2); }
.pc-seek { position: relative; flex: 1; min-width: 80px; height: var(--touch); display: flex; align-items: center; }
.pc-track { position: absolute; left: 0; right: 0; height: 10px; border-radius: var(--radius-full); background: var(--color-surface-2); overflow: hidden; }
.pc-allowed { position: absolute; left: 0; top: 0; bottom: 0; background: color-mix(in srgb, var(--color-primary) 22%, transparent); }
.pc-verified span { position: absolute; top: 0; bottom: 0; background: var(--color-primary); }
.pc-locked { position: absolute; top: 0; bottom: 0; background: repeating-linear-gradient(135deg, var(--color-border-strong) 0 4px, transparent 4px 8px); transition: background var(--dur) var(--ease); }
.pc-locked.flash { background: repeating-linear-gradient(135deg, var(--color-danger) 0 4px, var(--color-danger-soft) 4px 8px); }
.pc-playhead { position: absolute; top: 0; bottom: 0; width: 3px; margin-left: -1px; background: var(--color-text); }
.pc-range { position: relative; z-index: 1; width: 100%; height: var(--touch); margin: 0; opacity: 0; cursor: pointer; }
.pc-range:focus-visible { opacity: 0.35; }
.pc-seek:focus-within .pc-track { box-shadow: var(--ring); }
.pc-rate { min-height: 36px; border: 1px solid var(--color-border-strong); border-radius: var(--radius-sm); background: var(--color-surface); padding: 0 4px; font-size: var(--text-xs); }
@media (max-width: 479px) { .pc-time { display: none; } .pc-bar { gap: 2px; padding: var(--space-1); } }
.pc-legend { display: flex; flex-wrap: wrap; gap: var(--space-4); font-size: var(--text-xs); color: var(--color-muted); }
.pc-legend span { display: inline-flex; align-items: center; gap: 6px; }
.pc-legend i { width: 14px; height: 8px; border-radius: 2px; display: inline-block; }
.lg-verified { background: var(--color-primary); }
.lg-allowed { background: color-mix(in srgb, var(--color-primary) 22%, transparent); }
.lg-locked { background: repeating-linear-gradient(135deg, var(--color-border-strong) 0 3px, transparent 3px 6px); }
.pc-banner { position: absolute; inset: 0; z-index: 2; display: grid; place-items: center; padding: var(--space-4); background: rgba(15, 23, 42, 0.82); color: #fff; text-align: center; }
.pc-banner > div { display: flex; flex-direction: column; align-items: center; gap: var(--space-3); max-width: 420px; }
.pc-banner p { margin: 0; }
.sim-screen { flex: 1; width: 100%; border: 0; background: none; color: #fff; cursor: pointer; }
.sim-clock { font-variant-numeric: tabular-nums; font-weight: 700; }
.anti-cheat-lab { margin-top: var(--space-4); }
.anti-cheat-lab > summary { display: flex; align-items: center; gap: var(--space-2); cursor: pointer; font-weight: 700; min-height: var(--touch); }
.lab-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin: var(--space-3) 0; }
.lab-actions .btn { white-space: normal; text-align: left; height: auto; padding-top: var(--space-2); padding-bottom: var(--space-2); }
.demo-log { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-2); font-size: var(--text-sm); }
.demo-log li { display: grid; gap: 2px; padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm); border-left: 3px solid var(--color-success); background: var(--color-surface-2); }
.demo-log li.blocked { border-left-color: var(--color-danger); }

/* ---------- Course completion ---------- */
.course-strip { display: grid; grid-template-columns: 1fr auto; gap: var(--space-2) var(--space-3); align-items: center; padding: var(--space-3) var(--space-4); margin-bottom: var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface); font-size: var(--text-sm); }
.course-strip .progress { grid-column: 1 / -1; }
.policy-list { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-1); font-size: var(--text-xs); color: var(--color-muted); }
.policy-list li { display: flex; gap: 6px; align-items: flex-start; }
.policy-list .icon { margin-top: 2px; flex-shrink: 0; }
.cta-done { border-color: color-mix(in srgb, var(--color-success) 45%, var(--color-border)); }
.done-badge { display: flex; align-items: center; gap: var(--space-3); color: var(--color-success); }
.done-badge div { display: flex; flex-direction: column; }
.done-badge span { color: var(--color-muted); font-size: var(--text-sm); }
.cert-list { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-3); }
.cert { display: flex; align-items: center; gap: var(--space-3); }
.cert div { display: flex; flex-direction: column; }
.cert-icon { display: grid; place-items: center; width: 44px; height: 44px; border-radius: var(--radius-md); background: var(--color-success-soft); color: var(--color-success); }
.btn.is-locked { opacity: 0.65; cursor: not-allowed; }
.check-row { display: flex; gap: var(--space-3); align-items: flex-start; padding: var(--space-3); border: 1px solid var(--color-border); border-radius: var(--radius-md); cursor: pointer; }
.check-row input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--color-primary); }
.check-row span { display: flex; flex-direction: column; }
.sd-lessons, .event-list { list-style: none; padding: 0; margin: 0 0 var(--space-4); display: grid; gap: var(--space-2); font-size: var(--text-sm); }
.sd-lessons li { display: flex; align-items: center; gap: var(--space-2); flex-wrap: wrap; padding: var(--space-2) 0; border-bottom: 1px solid var(--color-border); }
.sd-title { flex: 1; min-width: 160px; }
.sd-pct { font-variant-numeric: tabular-nums; color: var(--color-muted); font-size: var(--text-xs); }
.event-list li { display: flex; gap: var(--space-3); align-items: flex-start; }
.event-list p { margin: 2px 0; }
.student-detail h3 { margin-top: var(--space-4); }

/* ---------- Academic taxonomy (prom5 + prom6) ---------- */
.tx-search { margin-bottom: var(--space-4); }
.tx-results:empty { display: none; }
.tx-hits { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-2); }
.tx-hits li { display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-2); padding: var(--space-2) 0; border-bottom: 1px solid var(--color-border); }
.tx-path { width: 100%; }
.tx-en { color: var(--color-muted); font-size: var(--text-sm); font-style: italic; }
.tx-tab-count { margin-left: 4px; padding: 0 8px; border-radius: var(--radius-full); background: var(--color-surface-2); font-size: var(--text-xs); }
.tx-parents { display: grid; gap: var(--space-3); }
.tx-parent { border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface); }
.tx-parent > summary { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-4) var(--space-5); cursor: pointer; list-style: none; min-height: var(--touch); }
.tx-parent > summary::-webkit-details-marker { display: none; }
.tx-parent > summary > span:first-child { flex: 1; display: flex; flex-direction: column; }
.tx-parent[open] > summary .icon { transform: rotate(180deg); }
.tx-parent > summary .icon { transition: transform var(--dur) var(--ease); }
.tx-count { font-size: var(--text-xs); color: var(--color-muted); white-space: nowrap; }
.tx-parent-body { padding: 0 var(--space-5) var(--space-5); }
.tx-children { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-2); }
@media (min-width: 1024px) { .tx-children { grid-template-columns: 1fr 1fr; } }
.tx-child { padding: var(--space-3); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-background); display: grid; gap: var(--space-2); }
.tx-child-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-2); }
.tx-child-name { font-weight: 650; text-decoration: none; }
.tx-badges { display: inline-flex; flex-wrap: wrap; gap: 4px; }
.tx-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.tx-chips.lg .chip { font-size: var(--text-sm); padding: 6px 12px; }
a.chip { text-decoration: none; }
a.chip:hover { background: var(--color-primary-soft); color: var(--color-primary); }
.chip-p5 { background: var(--color-info-soft); color: var(--color-info); }
.section-tight { margin: var(--space-10) 0 var(--space-6); }
.tx-relations { display: grid; gap: var(--space-4); grid-template-columns: 1fr; }
@media (min-width: 768px) { .tx-relations { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1200px) { .tx-relations { grid-template-columns: repeat(3, 1fr); } }
.tx-rel { padding: var(--space-5); border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface); }
.tx-rel p { margin: 0 0 var(--space-2); }
.tx-rel-nodes { list-style: none; padding: 0; margin: var(--space-3) 0; display: grid; gap: var(--space-1); font-size: var(--text-sm); }
.tx-rel-nodes li { display: flex; flex-direction: column; }
.tx-verdict { display: flex; gap: 6px; align-items: flex-start; margin: 0; font-size: var(--text-sm); color: var(--color-success); }
.tx-verdict.gap { color: var(--color-warning); }
.tx-verdict .icon { flex-shrink: 0; margin-top: 2px; }
.tx-report > summary { display: flex; align-items: center; gap: var(--space-2); flex-wrap: wrap; cursor: pointer; min-height: var(--touch); }
.tx-integrity { display: flex; flex-wrap: wrap; gap: var(--space-3); margin: var(--space-4) 0; }
.tx-check { display: inline-flex; align-items: center; gap: 6px; font-size: var(--text-sm); font-weight: 600; }
.tx-check.ok { color: var(--color-success); }
.tx-check.bad { color: var(--color-danger); }
.tx-report-block { margin-top: var(--space-5); }
.tx-report-block h3 { font-size: var(--text-base); display: flex; align-items: center; gap: var(--space-2); flex-wrap: wrap; }
.tx-report-block ul { margin: 0; padding-left: 1.25rem; display: grid; gap: 4px; font-size: var(--text-sm); }
.tx-detail .page-header { align-items: flex-start; }
.tx-detail .page-header .lead { margin-bottom: var(--space-3); }
.tx-sec { margin: var(--space-8) 0; }
.tx-sec h2 { display: flex; align-items: center; gap: var(--space-2); font-size: var(--text-xl); }
.tx-careers { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: var(--space-3); }
.tx-careers li { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-3) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface); }
.tx-tiers { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-3); counter-reset: tier; }
@media (min-width: 900px) { .tx-tiers { grid-template-columns: repeat(4, 1fr); } }
.tx-tiers > li { padding: var(--space-4); border-radius: var(--radius-lg); border: 1px solid var(--color-border); background: var(--color-surface); border-top: 4px solid var(--color-primary); }
.tx-tiers > li:nth-child(2) { border-top-color: var(--color-accent); }
.tx-tiers > li:nth-child(3) { border-top-color: var(--color-warning); }
.tx-tiers > li:nth-child(4) { border-top-color: var(--color-success); }
.tx-tiers h3 { font-size: var(--text-sm); }
.tx-tiers ul { margin: 0; padding-left: 1.1rem; font-size: var(--text-sm); display: grid; gap: 4px; }
.tx-refs { padding-left: 1.25rem; display: grid; gap: var(--space-1); }
.tx-empty-profile p { margin-bottom: var(--space-2); }
.filter-chips:empty { display: none; }
.filter-chips { margin: calc(-1 * var(--space-3)) 0 var(--space-4); }
.chip-filter { display: inline-flex; align-items: center; gap: 6px; background: var(--color-primary-soft); color: var(--color-primary); padding: 4px 6px 4px 10px; font-size: var(--text-sm); }
.chip-filter button { display: grid; place-items: center; width: 24px; height: 24px; border: 0; border-radius: 50%; background: transparent; color: inherit; }
.chip-filter button:hover { background: rgba(0,0,0,0.08); }
.discipline-links { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-2); }
.discipline-links li { display: flex; gap: var(--space-2); align-items: center; }