:root{--bg:#fafaf7;--fg:#1c1a17;--muted:#6b665e;--card:#ffffff;--line:#e4dfd5;--accent:#b3261e;--accent-fg:#ffffff;--radius:10px}@media (prefers-color-scheme:dark){:root{--bg:#14120f;--fg:#f3efe7;--muted:#a39d92;--card:#1e1b17;--line:#342f28;--accent:#e0554c;--accent-fg:#14120f}}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--fg);font:16px/1.5 system-ui,-apple-system,Segoe UI,Noto Sans TC,Noto Sans SC,sans-serif}a{color:inherit}.container{max-width:1240px;margin:0 auto;padding:0 16px}.site-header{border-bottom:1px solid var(--line);background:var(--card)}.site-header .container{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;padding-top:12px;padding-bottom:12px}.brand{font-weight:700;font-size:1.15rem;text-decoration:none}.nav{display:flex;flex-wrap:wrap;gap:14px;align-items:center}.nav a{text-decoration:none;color:var(--muted)}.nav a:focus-visible,.nav 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var(--line)}.lesson-list li:last-child{border-bottom:0}form.stack{display:grid;grid-gap:12px;gap:12px;max-width:360px}label{display:grid;grid-gap:4px;gap:4px}.error{color:var(--accent)}.player-video{width:100%;aspect-ratio:16/9;max-height:75vh;object-fit:contain;background:#000;border-radius:var(--radius);display:block}.player-controls{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:center;margin:12px 0}.player-controls .btn{min-height:44px}label.inline{display:inline-flex;flex-direction:row;align-items:center;gap:6px}.btn[aria-pressed=true]{background:var(--accent);color:var(--accent-fg);border-color:var(--accent)}.marker-strip{position:relative;height:14px;margin:10px 0;background:var(--line);border-radius:7px;overflow:hidden}.marker-progress{position:absolute;inset:0 auto 0 0;background:var(--muted);opacity:.35}.marker{position:absolute;top:0;bottom:0;min-width:4px;border:0;background:var(--accent);opacity:.55;cursor:pointer;padding:0}.marker.active{opacity:1}.technique-list{list-style:none;margin:0;padding:0;border:1px solid var(--line);border-radius:var(--radius);background:var(--card)}.technique-list li{border-bottom:1px solid var(--line);padding:0 14px}.technique-list li:last-child{border-bottom:0}.technique-list li.active{background:color-mix(in srgb,var(--accent) 10%,var(--card))}.technique-btn{display:block;width:100%;text-align:start;background:none;border:0;color:inherit;font:inherit;cursor:pointer;padding:10px 0}.technique-btn:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.linklike{background:none;border:0;padding:0;font:inherit;color:var(--muted);text-decoration:underline;cursor:pointer}.linklike:focus-visible,.linklike:hover{color:var(--fg)}.nav a.btn{color:var(--accent-fg)}.nav a.btn.secondary{color:var(--fg)}.sr-only{padding:0;margin:-1px;clip:rect(0,0,0,0);border:0}@media (max-width:640px){.nav select{min-height:44px}}.saving{display:flex;flex-direction:column;gap:2px}.lesson-list .badge{-webkit-margin-end:4px;margin-inline-end:4px}.owned-lessons{margin:4px 0;-webkit-padding-start:18px;padding-inline-start:18px}.yt-frame{position:relative;aspect-ratio:16/9;background:#000;border-radius:var(--radius);overflow:hidden}.yt-frame:-webkit-full-screen{border-radius:0}.yt-frame:fullscreen{border-radius:0}.yt-host,.yt-host iframe,.yt-host>div{position:absolute;inset:0;width:100%;height:100%;border:0}.subtitle-overlay{position:absolute;left:4%;right:4%;bottom:12%;text-align:center;color:#fff;background:rgba(0,0,0,.7);padding:4px 10px;border-radius:6px;font-size:clamp(.95rem,2.6vw,1.4rem);line-height:1.35;white-space:pre-line;pointer-events:none}.order-summary{border-bottom:1px solid var(--line);padding-bottom:8px}.order-summary p{margin:2px 0}.pay-bar{position:-webkit-sticky;position:sticky;bottom:0;z-index:10;display:flex;flex-wrap:wrap;align-items:center;gap:12px;padding:12px 0;background:var(--card);border-top:1px solid var(--line)}.pay-bar .btn{min-height:44px;flex:1 1 140px;text-align:center}.badge.free{background:#0a7a3c;color:#fff;border-color:#0a7a3c;font-weight:600}.cover.thumb{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;padding:12px;text-align:center;color:#fff;background:linear-gradient(135deg,#5c0f0b,#b3261e)}.cover.thumb.hero{min-height:220px}.thumb-play{opacity:.9}.thumb-form{font-size:1.25rem;font-weight:700;line-height:1.2;overflow-wrap:anywhere}.thumb-by{font-size:.8rem;opacity:.9}.chip{display:inline-block;padding:4px 10px;border-radius:6px;font-size:.875rem;font-weight:600;background:color-mix(in srgb,var(--accent) 14%,transparent);color:var(--fg);cursor:default}body{display:flex;flex-direction:column;min-height:100vh}main{flex:1 0 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0}.terms{max-width:720px}.terms h3{margin:1em 0 .2em}.cover.thumb{position:relative;overflow:hidden;aspect-ratio:16/9;width:100%}.thumb-fallback{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;position:absolute;inset:0;padding:12px}.thumb-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .2s}.cover.thumb[data-thumb=ok] .thumb-img{opacity:1}.cover.thumb[data-thumb=ok] .thumb-fallback{visibility:hidden}.cover.thumb.hero{min-height:0;max-width:100%;padding:0}.cover.thumb.row{width:112px;flex:none;border-radius:6px}.cover.thumb.row .thumb-fallback{padding:0}.lesson-title{display:flex;align-items:center;gap:12px}@media 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.time-readout{order:5;flex-basis:100%}}.loop-range{background:#e8590c;opacity:.85}.loop-edge,.loop-range{position:absolute;top:0;bottom:0;pointer-events:none}.loop-edge{width:3px;margin-left:-1.5px;background:#fff;box-shadow:0 0 0 1px #e8590c}.badge.category{align-self:flex-start;color:var(--fg);background:color-mix(in srgb,var(--accent) 10%,transparent)}.cat-heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:24px 0 8px}.cat-all{font-size:.875rem;font-weight:400}.category-filters,.category-filters button{min-height:44px}.demo-link{position:relative;display:block;max-width:100%;color:inherit;text-decoration:none;border-radius:var(--radius)}.demo-link .cover.thumb.hero{max-width:none}.demo-cta{position:absolute;inset-inline-start:12px;inset-block-end:12px;display:inline-flex;align-items:center;gap:8px;padding:6px 14px 6px 8px;border-radius:99px;background:rgba(0,0,0,.72);color:#fff;font-weight:600;min-height:44px}.demo-cta 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8px;font-weight:700}.technique-nav select{min-height:44px}.ab-help{margin:0 0 8px;font-size:.85rem}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}@media (max-width:480px){.technique-nav{gap:4px}.technique-nav .btn.icon{min-width:38px;padding:0 4px}.transport{gap:6px 8px}}.lang-switch{position:relative;display:inline-flex;align-items:center;gap:4px;min-height:44px;padding:0 8px;border:1px solid var(--line);border-radius:99px;background:var(--card);color:var(--fg)}.lang-switch select{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer;min-height:44px}.lang-switch:focus-within{outline:3px solid var(--accent);outline-offset:2px}.lang-code{font-size:.8rem;font-weight:600}.site-header .container{flex-wrap:nowrap;gap:8px}.site-header .brand{min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.nav{flex-wrap:nowrap;gap:10px;flex:none}@media (max-width:420px){.nav{gap:6px}.nav .btn{padding-inline:10px}.lang-switch{padding:0 6px}}.site-footer{margin-top:24px;padding:12px 0}.footer-nav a{min-height:44px;line-height:44px}.card.skeleton{pointer-events:none}.card.skeleton .cover{aspect-ratio:16/9;background:var(--line)}.sk-line{display:block;height:14px;border-radius:4px;background:var(--line);width:80%}.sk-line.short{width:40%}.cover.thumb[data-thumb=loading]{background:var(--line)}.cover.thumb[data-thumb=loading] .thumb-fallback{visibility:hidden}