:root {
  --bg: #101514; --surface: #191f1d; --surface-raised: #202824;
  --line: #303b35; --text: #eff3ec; --muted: #9daa9f;
  --accent: #c5f389; --red: #ffaaa1; color-scheme: dark;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--text); font: 14px/1.6 Inter, "Segoe UI", system-ui, sans-serif; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button, select { font: inherit; }
button, a, select { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
a:focus-visible, button:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
button:disabled { opacity: .45; cursor: default; }
::selection { background: var(--accent); color: var(--bg); }
.accent { color: var(--accent); }
.topbar { max-width: 1440px; height: 82px; margin: auto; padding: 0 5%; display: flex; gap: 26px; align-items: center; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; font-size: 25px; font-weight: 750; letter-spacing: -1px; }
.brand-light { font-weight: 400; }
.brand-mark { width: 34px; height: 36px; margin-right: 10px; border-radius: 10px; display: grid; place-items: center; background: var(--accent); color: #25331b; font-size: 14px; padding-left: 2px; }
.brand-caption { font-size: 9px; color: var(--muted); letter-spacing: 2px; padding-left: 26px; border-left: 1px solid var(--line); }
.header-link { margin-left: auto; color: #c4d0c4; font-size: 12px; display: flex; gap: 8px; align-items: center; }
.header-link span { color: var(--accent); }
.header-link:hover { color: var(--accent); }
main { max-width: 1320px; padding: 0 36px 50px; margin: auto; }
.hero { display: flex; justify-content: space-between; align-items: center; gap: 30px; padding: 48px 4px 40px; }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: 10px; letter-spacing: 2px; font-weight: 600; }
h1 { margin: 0; font-size: clamp(34px, 4.3vw, 56px); font-weight: 550; line-height: 1.13; letter-spacing: -2px; }
h1 span { color: #a4b0a6; }
.lead { margin: 18px 0 0; color: var(--muted); font-size: 13px; max-width: 470px; }
.hero-art { position: relative; width: 310px; height: 180px; display: grid; place-items: center; margin-right: 35px; background: radial-gradient(ellipse, #c5f38909, transparent 65%); }
.orbit { position: absolute; width: 245px; height: 110px; border: 1px solid #c5f3892c; border-radius: 50%; transform: rotate(-25deg); }
.orbit-two { width: 195px; height: 155px; border-color: #c5f38919; transform: rotate(40deg); }
.art-play { width: 82px; height: 82px; display: grid; place-items: center; padding-left: 5px; font-size: 30px; color: var(--accent); border: 1px solid #c5f38955; border-radius: 23px; background: linear-gradient(140deg, #c5f38920, #c5f38906); transform: rotate(-10deg); }
.art-label { position: absolute; border: 1px solid #38493a; border-radius: 5px; background: #1b261e; color: #c0d1bf; padding: 6px 10px; font-size: 8px; letter-spacing: 1px; }
.label-top { right: -5px; top: 11px; transform: rotate(6deg); }
.label-bottom { left: -5px; bottom: 15px; transform: rotate(-5deg); }
.tabs { display: flex; gap: 16px; border-bottom: 1px solid var(--line); margin-bottom: 26px; }
.tabs a { position: relative; display: flex; align-items: center; gap: 9px; padding: 15px 20px; font-size: 13px; color: var(--muted); }
.tabs a > span { font-size: 20px; line-height: 1; }
.tabs a:hover { color: var(--text); }
.tabs a[aria-selected="true"] { color: var(--accent); }
.tabs a[aria-selected="true"]::after { content: ""; position: absolute; height: 2px; bottom: -1px; left: 14px; right: 14px; background: var(--accent); }
.classroom { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 24px; align-items: start; }
.lesson-main { min-width: 0; }
.player-wrap { position: relative; aspect-ratio: 16/9; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: #080d0b; }
video { display: block; width: 100%; height: 100%; object-fit: contain; background: #080d0b; }
.overlay { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; padding: 20px; background: radial-gradient(ellipse, #1f3026, #0b120e); pointer-events: none; }
.overlay-box { display: grid; gap: 9px; max-width: 370px; font-size: 12px; color: var(--muted); }
.overlay-box strong { color: var(--text); font-size: 19px; font-weight: 550; }
.overlay.is-error strong { color: var(--red); }
.empty-icon { font-size: 45px; color: #78937a; margin-bottom: 8px; }
.spinner { margin: 0 auto 8px; width: 29px; height: 29px; border: 2px solid #3a493f; border-top-color: var(--accent); border-radius: 50%; animation: spin 1s linear infinite; }
.playback-bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; min-height: 44px; padding: 9px 3px; }
.status { display: inline-flex; align-items: center; gap: 7px; font-size: 11px; color: var(--muted); }
.status::before { content: ""; width: 6px; height: 6px; background: #7a897d; border-radius: 50%; }
.status[data-state="playing"]::before { background: var(--accent); }
.status[data-state="loading"]::before { background: #e5cb80; animation: pulse 1s infinite; }
.status[data-state="error"] { color: var(--red); }
.status[data-state="error"]::before { background: var(--red); }
.playback-options { display: flex; align-items: center; gap: 12px; }
.time { color: #91a193; font: 10px ui-monospace, monospace; }
select { max-width: 180px; padding: 4px 7px; font-size: 11px; background: var(--surface); border: 1px solid var(--line); border-radius: 5px; color: var(--text); }
.text-button { padding: 3px 8px; color: var(--accent); font-size: 11px; background: transparent; border: 1px solid var(--line); border-radius: 5px; }
.lesson-info { padding: 22px 3px 0; border-top: 1px solid var(--line); }
.lesson-info .eyebrow { font-size: 9px; margin-bottom: 7px; }
h2 { margin: 0; font-size: 23px; font-weight: 550; letter-spacing: -.5px; }
.lesson-info > p:not(.eyebrow) { color: var(--muted); font-size: 13px; margin: 12px 0 0; white-space: pre-line; }
.lesson-actions { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; margin-top: 25px; }
.sound-note { font-size: 11px; color: #8b9c8d; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 20px; padding: 11px 15px; font-size: 12px; font-weight: 600; border: 1px solid var(--line); border-radius: 8px; transition: background .15s, transform .15s; }
.button:active:not(:disabled) { transform: translateY(1px); }
.button-primary { background: var(--accent); color: #23351a; border-color: var(--accent); }
.button-primary:hover:not(:disabled) { background: #d6ffa5; }
.button-secondary { background: var(--surface-raised); color: var(--text); }
.button-secondary:hover:not(:disabled) { background: #2d3a30; }
.curriculum { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.curriculum-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 22px 20px; border-bottom: 1px solid var(--line); }
.curriculum-head .eyebrow { font-size: 8px; color: var(--muted); letter-spacing: 1.5px; margin-bottom: 5px; }
.curriculum h2 { font-size: 17px; }
.count { font-size: 10px; color: var(--muted); border: 1px solid var(--line); padding: 3px 7px; border-radius: 5px; white-space: nowrap; }
.lesson-list { padding: 10px; max-height: 420px; overflow: auto; }
.lesson-item { width: 100%; display: flex; align-items: center; gap: 12px; text-align: left; padding: 14px 11px; border: 1px solid transparent; border-radius: 8px; background: transparent; color: var(--text); margin-bottom: 4px; }
.lesson-item:hover { background: #222d25; }
.lesson-item[aria-current="true"] { background: #c5f3890c; border-color: #c5f38930; }
.lesson-index { display: grid; place-items: center; width: 31px; height: 33px; flex-shrink: 0; border: 1px solid var(--line); border-radius: 7px; color: var(--muted); font-size: 11px; }
.lesson-item[aria-current="true"] .lesson-index { background: var(--accent); color: #26371d; border-color: var(--accent); }
.lesson-item-title { display: block; font-size: 12px; font-weight: 550; overflow-wrap: anywhere; }
.lesson-item-meta { display: block; color: var(--muted); font-size: 10px; margin-top: 3px; }
.curriculum-note { display: flex; gap: 10px; padding: 20px; margin-top: 8px; border-top: 1px solid var(--line); }
.curriculum-note > span { font-size: 20px; color: #8ba879; }
.curriculum-note p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.8; }
.empty-note { margin: 12px; color: var(--muted); font-size: 12px; }
.live-badge { background: #283329; border: 1px solid #3a493b; color: var(--muted); border-radius: 4px; padding: 3px 7px; font-size: 8px; letter-spacing: 1px; }
.live-badge[data-on="true"] { color: var(--red); background: #ffaaa10c; border-color: #ffaaa144; }
.live-aside { padding: 28px 23px 0; }
.class-icon { width: 52px; height: 52px; display: grid; place-items: center; font-size: 29px; border-radius: 14px; background: #c5f3890d; color: var(--accent); border: 1px solid #c5f38922; margin-bottom: 24px; }
.live-aside > .eyebrow { font-size: 8px; color: var(--muted); }
.live-aside > h2 { font-size: 23px; }
.aside-description { color: var(--muted); font-size: 12px; margin: 12px 0 24px; }
.live-aside > .button { width: 100%; margin-bottom: 10px; }
.live-aside .curriculum-note { margin: 20px -23px 0; padding: 20px 23px; }
.noscript-note { padding: 15px; border: 1px solid var(--line); border-radius: 8px; color: var(--muted); }
footer { max-width: 1248px; margin: auto; padding: 24px 0 30px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 20px; font-size: 11px; color: #819184; }
.footer-brand { color: #b1c0b0; font-weight: 600; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 50% { opacity: .35; } }
@media (max-width: 1050px) { .classroom { grid-template-columns: minmax(0, 1fr) 280px; gap: 20px; } .hero-art { margin-right: 0; } footer { margin: 0 36px; } }
@media (max-width: 760px) { .topbar { height: 70px; padding: 0 20px; } .brand-caption { display: none; } .header-link { font-size: 10px; } main { padding: 0 20px 35px; } .hero { padding: 32px 0; } .hero-art { width: 170px; height: 150px; flex-shrink: 0; } .orbit { width: 165px; height: 85px; } .orbit-two { width: 135px; height: 125px; } .art-play { width: 65px; height: 65px; border-radius: 18px; font-size: 24px; } .art-label { font-size: 6px; padding: 4px 6px; } .label-top { top: 7px; } .label-bottom { bottom: 8px; left: -10px; } .classroom { grid-template-columns: 1fr; } .curriculum { margin-top: 5px; } .lesson-list { max-height: 300px; } .tabs { gap: 0; } .tabs a { padding: 13px 14px; flex: 1; justify-content: center; font-size: 12px; } footer { margin: 0 20px; } }
@media (max-width: 480px) { .brand { font-size: 22px; } .brand-mark { width: 29px; height: 31px; } .header-link { max-width: 130px; font-size: 10px; } .hero-art { display: none; } h1 { font-size: 39px; letter-spacing: -1.5px; } .lead { font-size: 12px; } .tabs a { padding: 13px 7px; font-size: 11px; gap: 6px; } .tabs a > span { font-size: 17px; } .player-wrap { border-radius: 10px; } h2 { font-size: 21px; } .lesson-actions { align-items: flex-start; flex-direction: column; } .lesson-actions .button { width: 100%; } .overlay-box strong { font-size: 16px; } .overlay-box { font-size: 11px; } .empty-icon { font-size: 32px; } footer { font-size: 10px; } }
.gallery-head { display: flex; justify-content: space-between; align-items: center; gap: 20px; margin: 8px 0 24px; }
.gallery-description { margin: 9px 0 0; font-size: 12px; color: var(--muted); }
.gallery { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.image-card { min-width: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); transition: border-color .2s; }
.image-card:hover { border-color: #799868; }
.image-preview { display: block; width: 100%; padding: 0; border: 0; background: #0b120e; cursor: zoom-in; }
.image-thumb { display: block; width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
.image-info { padding: 15px 17px; }
.image-info h3 { font-size: 14px; font-weight: 550; margin: 0 0 4px; overflow-wrap: anywhere; }
.image-meta { font-size: 10px; color: var(--muted); }
.lightbox { position: fixed; inset: 0; z-index: 100; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 16px; padding: 65px 24px 30px; background: #080e0cf5; backdrop-filter: blur(10px); }
.lightbox img { max-width: 100%; max-height: 78vh; object-fit: contain; border-radius: 10px; }
.lightbox p { margin: 0; color: var(--muted); font-size: 13px; overflow-wrap: anywhere; }
.lightbox-close { position: absolute; top: 18px; right: 24px; width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--line); background: var(--surface); color: var(--text); font-size: 26px; }
@media (max-width: 760px) { .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; } .tabs { overflow-x: auto; } .tabs a { flex: 1 0 auto; white-space: nowrap; } }
@media (max-width: 480px) { .gallery { gap: 10px; } .image-info { padding: 11px; } .image-info h3 { font-size: 12px; } .image-meta { font-size: 9px; } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }