:root{--paper: #f7f4ee;--card: #fffdf9;--ink: #1f1d1a;--muted: #6e695f;--line: #e4ded3;--soft: #efeae1;--warn: #a4471d;--radius: 14px;--accent: #4f46b8;color-scheme:light;font-family:ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased}*{box-sizing:border-box}body{margin:0;background:var(--paper)}button,input,textarea{font:inherit;color:inherit}h3{margin:0;font-size:15px;font-weight:600}a{color:inherit}.app{max-width:1180px;margin:0 auto;padding:20px 24px 40px}.top{display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;letter-spacing:-.01em}.seg{display:inline-flex;background:var(--soft);border-radius:999px;padding:3px;gap:2px}.seg button{border:1px solid transparent;background:none;padding:6px 14px;border-radius:999px;cursor:pointer;font-weight:600;font-size:14px;color:var(--muted)}.seg button[data-on=true]{background:var(--card);color:var(--ink);box-shadow:0 1px 2px #00000014}.seg--lang button[data-on=true]{background:var(--accent);color:#fff}.seg--small button{padding:4px 10px;font-size:13px}.bridge .seg button[data-on=true]{color:#fff}.tabs{display:flex;gap:4px;margin:22px 0 0;border-bottom:1px solid var(--line);overflow-x:auto}.tabs button{background:none;border:0;padding:10px 14px 12px;font-weight:600;font-size:15px;color:var(--muted);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-1px;white-space:nowrap}.tabs button[data-on=true]{color:var(--ink);border-bottom-color:var(--accent)}.langnote{margin:14px 0 18px;color:var(--muted);font-size:14px}.langnote strong{color:var(--ink);font-weight:600}.split{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:20px;align-items:start}.split--even{grid-template-columns:minmax(0,1fr) minmax(0,1.1fr)}.split__main,.split__side{display:flex;flex-direction:column;gap:14px;min-width:0}@media (max-width: 860px){.split,.split--even{grid-template-columns:1fr}.app{padding:16px}}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;display:flex;flex-direction:column;gap:12px}.row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.grow{flex:1}.muted{color:var(--muted)}.small{font-size:13px}.note{font-size:13px;color:var(--muted);margin:0}.note--warn{color:var(--warn)}.btn{border:1px solid var(--line);background:var(--card);padding:8px 14px;border-radius:10px;font-weight:600;font-size:14px;cursor:pointer;display:inline-flex;align-items:center;gap:8px}.btn:hover:not(:disabled){border-color:#cfc7b9}.btn:disabled{opacity:.45;cursor:default}.btn--primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn--primary:hover:not(:disabled){filter:brightness(1.07);border-color:var(--accent)}.btn--small{padding:5px 10px;font-size:13px}.btn .dot{width:8px;height:8px;border-radius:50%;background:var(--muted)}.btn--rec{border-color:#c2412d;color:#c2412d}.btn--rec .dot{background:#c2412d;animation:pulse 1s infinite}@keyframes pulse{50%{opacity:.3}}.camera{position:relative;aspect-ratio:4 / 3;background:#1b1a18;border-radius:var(--radius);overflow:hidden}.camera__video,.camera__overlay{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;object-fit:cover;transform:scaleX(-1)}.camera__placeholder{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;color:#d9d3c7;text-align:center;padding:24px;background:radial-gradient(circle at 50% 40%,#2b2925,#1b1a18 70%)}.camera__placeholder p{margin:0;max-width:320px;font-size:14px}.camera__error{color:#f0b79f}.camera__chip{position:absolute;top:12px;left:12px;display:flex;align-items:center;gap:7px;background:#1413119e;color:#fff;padding:5px 11px;border-radius:999px;font-size:13px;font-weight:600;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.camera__chip .dot{width:8px;height:8px;border-radius:50%;background:#8a857c}.camera__chip[data-on=true] .dot{background:#5ad17c}.camera__badge{position:absolute;top:12px;right:12px;background:var(--card);border-radius:14px;padding:6px 14px 8px;text-align:center;box-shadow:0 6px 20px #00000040;min-width:74px}.camera__badge span{display:block;font-size:46px;font-weight:700;line-height:1.05;color:var(--accent)}.camera__badge small{display:block;font-size:11px;color:var(--muted);font-weight:600}.camera__stop{position:absolute;bottom:12px;left:12px;background:#1413119e;color:#fff;border:0;border-radius:999px;padding:6px 12px;font-size:13px;font-weight:600;cursor:pointer;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.tips{margin:0;padding:0 0 0 18px;color:var(--muted);font-size:13px;display:grid;gap:4px}.transcript{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;display:flex;flex-direction:column;gap:14px}.reading{display:flex;gap:16px;align-items:center}.reading__letter{font-size:64px;font-weight:700;width:76px;text-align:center;line-height:1;color:var(--line)}.reading__meta{flex:1;display:flex;flex-direction:column;gap:7px;min-width:0}.reading__line{display:flex;justify-content:space-between;gap:8px;font-size:13px;font-weight:600}.meter,.hold{height:8px;background:var(--soft);border-radius:99px;overflow:hidden}.hold{height:4px}.meter__fill,.hold__fill{height:100%;border-radius:99px;transition:width .12s linear}.output{min-height:96px;font-size:28px;line-height:1.3;font-weight:600;letter-spacing:.02em;padding:12px 14px;background:var(--paper);border-radius:10px;word-break:break-word;white-space:pre-wrap}.output .muted{line-height:1.5;font-size:15px;font-weight:500;letter-spacing:0}.caret{display:inline-block;width:3px;height:1em;vertical-align:-.12em;margin-left:2px;animation:pulse 1s infinite}.compare{flex-direction:row;align-items:center}.compare p{margin:0;font-size:13px;color:var(--muted)}.compare strong{color:var(--ink)}.pose{display:block;background:var(--paper);border-radius:12px;flex-shrink:0}.pose--empty,.pose--space{display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:13px;border:1px dashed var(--line)}.player{display:flex;flex-direction:column;gap:14px}.player--empty{min-height:320px;align-items:center;justify-content:center;background:var(--card);border:1px dashed var(--line);border-radius:var(--radius);color:var(--muted);padding:24px;text-align:center}.split__main>.player:not(.player--empty){background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px}.player__stage{display:flex;align-items:center;justify-content:center;gap:24px;position:relative;flex-wrap:wrap}.player__letter{font-size:96px;font-weight:700;line-height:1;min-width:80px;text-align:center}.player__hint{position:absolute;bottom:-4px;left:0;right:0;text-align:center;margin:0;font-size:12px;color:var(--muted)}.player__strip{display:flex;flex-wrap:wrap;gap:4px}.player__cell{width:30px;height:34px;border:1px solid var(--line);background:var(--card);border-radius:7px;font-weight:700;cursor:pointer;padding:0}.player__cell[data-space=true]{width:14px;border-style:dashed}.player__cell[data-on=true]{background:var(--ink);color:var(--paper);border-color:var(--ink)}.player__controls{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.compose label{font-weight:600;font-size:14px}.compose textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:18px;resize:vertical;background:var(--paper)}.compose textarea:focus{outline:2px solid var(--accent);outline-offset:-1px}.explain{margin:0;line-height:1.5}.bridge{display:flex;align-items:center;gap:10px}.tag{color:#fff;font-weight:700;font-size:14px;padding:6px 12px;border-radius:999px}.bridge__arrow{color:var(--muted);font-size:18px}.bridge__now{display:flex;align-items:center;gap:16px}.bridge__now p{margin:4px 0 0}.bridge__letter{font-size:72px;font-weight:700;line-height:1}.teach__head{display:flex;gap:16px;align-items:center}.teach__info{display:flex;flex-direction:column;gap:6px}.teach__info p{margin:0}.teach__letter{font-size:48px;font-weight:700;line-height:1}.letters{display:grid;grid-template-columns:repeat(9,1fr);gap:6px}.letters__cell{position:relative;aspect-ratio:1;border:1.5px solid var(--line);background:var(--card);border-radius:9px;font-weight:700;font-size:15px;cursor:pointer;padding:0}.letters__cell[data-on=true]{background:var(--paper)}.letters__cell i{position:absolute;bottom:5px;left:50%;width:5px;height:5px;margin-left:-2.5px;border-radius:50%}.foot{margin-top:36px;padding-top:16px;border-top:1px solid var(--line);font-size:13px;color:var(--muted);line-height:1.5}