:root{color-scheme:dark;font-family:Inter,"Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;color:#e7eff6;background:#101925;--cyan:#8bf0d9;--muted:#8f9ead;--line:#2c3949}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 15% 10%,#213443 0,transparent 48%),#101925}button,a,input{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;color:inherit;border:1px solid var(--line);transition:background .16s,transform .16s}button:hover{background:#334958}button:active{transform:translateY(1px)}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #8bf0d9;outline-offset:4px}button:disabled{opacity:.5;cursor:wait}.app{max-width:1190px;padding:26px 34px 18px;margin:auto}header{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px}.brand{color:inherit;text-decoration:none;display:flex;align-items:center;gap:13px}.brand-mark{display:grid;place-items:center;width:43px;height:43px;border:1px solid #83e7d2;color:var(--cyan);font-size:32px;border-radius:11px}.brand strong{font-size:21px;letter-spacing:.04em}.byline{display:block;font-size:12px;color:var(--muted);margin-top:5px}.header-right{display:flex;align-items:center;gap:16px}.version{font-size:12px;letter-spacing:.04em;border:1px solid var(--line);padding:7px 11px;border-radius:30px;color:#bbc8d2}.icon-button{font-size:23px;background:transparent;border:0;padding:4px 8px}main{display:grid;grid-template-columns:minmax(0,1fr) 314px;gap:30px}.arena{min-width:0;border:1px solid #364655;border-radius:18px;background:#152230;overflow:hidden}.arena-top{display:flex;align-items:center;justify-content:space-between;padding:13px 20px;background:#1b2a39;font-size:12px;color:#c3d2df;letter-spacing:.04em}.live-label:before{content:'';display:inline-block;width:7px;height:7px;margin-right:8px;border-radius:50%;background:#86efd6}#clock{font-variant-numeric:tabular-nums}.stage{position:relative;height:min(67vh,650px);min-height:460px;overflow:hidden;background:linear-gradient(140deg,#243d46,#142736 58%,#29454c)}#video{width:100%;height:100%;position:absolute;inset:0;object-fit:cover;transform:scaleX(-1);opacity:.63}.stage-shade{position:absolute;inset:0;background:linear-gradient(0deg,#0c1a298a,#101b2920)}#hands{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.board-wrap{position:absolute;top:19px;bottom:37px;left:50%;transform:translateX(-50%);height:calc(100% - 56px);aspect-ratio:1/2;max-width:90%;border:1px solid #a7dbda44;background:#09132170;border-radius:5px;box-shadow:0 0 55px #50d1c20c;overflow:hidden}#board{height:100%;width:100%;display:block}.stage-tag{position:absolute;right:16px;top:25px;writing-mode:vertical-rl;letter-spacing:.24em;font-size:10px;color:#c0ebe960}.feedback{position:absolute;bottom:10px;left:0;right:0;text-align:center;color:#d8fff6;font-size:14px;min-height:20px}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#0b1823a6;backdrop-filter:blur(5px)}.overlay.hidden{display:none}.overlay-card{text-align:center;padding:25px;max-width:440px}.eyebrow{font-size:12px;letter-spacing:.3em;color:var(--cyan)}h1{font-size:30px;letter-spacing:.02em;margin:19px 0 13px;font-weight:650}.overlay p{font-size:15px;line-height:1.9;color:#bccbd6}.primary{border:0;background:var(--cyan);color:#122c2b;border-radius:8px;padding:14px 24px;font-weight:700;min-width:210px;margin-top:15px}.primary:hover{background:#afffe9}.primary span{margin-left:30px}.overlay-tip{display:block;color:#a8bbc7;font-size:12px;margin-top:20px}.touch-controls{padding:12px 16px;display:grid;grid-template-columns:repeat(5,1fr);gap:9px}.touch-controls button{border-radius:9px;background:#223341;font-size:24px;padding:7px 4px;touch-action:none;user-select:none}.touch-controls button span{display:block;font-size:12px;margin-top:2px;color:#b6c7d1}.touch-controls button:last-child{background:#365650;color:#b8ffee;border-color:#547e72}aside{min-width:0}.scoreboard{border-bottom:1px solid var(--line);padding:8px 0 18px}.score-main>span,.score-sub span{color:var(--muted);font-size:14px;display:block}.score-main strong{font-family:ui-monospace,Consolas,monospace;font-weight:500;font-size:48px;display:block;letter-spacing:-.04em;margin-top:5px;color:#e9faf5}.score-sub{display:grid;grid-template-columns:1fr 1fr;margin-top:16px}.score-sub strong{font:28px ui-monospace,Consolas,monospace;display:block;margin-top:5px}.section-label{display:flex;justify-content:space-between;align-items:center;font-size:14px;color:#e0eaf0;margin-bottom:13px}.section-label>span{font-size:12px;color:var(--muted)}.next-section{padding:20px 0 18px}.next-pieces{display:flex;gap:12px}.next-pieces canvas{background:#1c2a38;border:1px solid var(--line);border-radius:8px;width:85px;height:58px}.camera-section{padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.camera-button{width:100%;background:#28423f;color:#bbffea;border:1px solid #476b60;padding:11px;border-radius:8px;font-size:14px}.camera-button>span{font-size:20px;vertical-align:middle;margin-right:6px}.status{font-size:12px;line-height:1.7;color:#a0b5c0;margin:10px 0}.hand-status{display:flex;gap:8px}.hand-status span{flex:1;font-size:12px;background:#202e3b;padding:7px 9px;border-radius:5px;color:#aab9c4}.hand-status span.active{color:#b6ffea;background:#254b43}.swap{display:flex;gap:7px;align-items:center;font-size:12px;color:#8e9fad;margin-top:11px}.swap input{accent-color:#8bf0d9}.guide{padding:20px 0 10px}.guide-row{display:flex;align-items:center;gap:12px;padding:8px 9px;border-radius:8px;margin:2px -9px;transition:background .12s}.guide-row.active{background:#2e5148}.gesture-icon{width:31px;text-align:center;font-size:24px;color:#9fe8d4}.guide-row strong{font-size:14px;font-weight:500;display:block}.guide-row div>span{display:block;font-size:12px;color:#8fabb7;margin-top:4px}.game-actions{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:8px}.secondary{background:#253542;border-radius:8px;padding:10px;font-size:14px}.privacy{font-size:12px;color:#8195a4;line-height:1.7;margin:13px 0 0}footer{margin-top:18px;padding:13px 2px;border-top:1px solid var(--line);display:flex;justify-content:space-between;color:#849aa9;font-size:12px}.shake{animation:shake .2s ease-out}@keyframes shake{50%{transform:translateX(-50%) translateY(4px)}}@media(min-width:950px) and (max-height:850px){.stage{height:600px;min-height:460px}.guide-row{padding-top:6px;padding-bottom:6px}.app{padding-top:18px}header{margin-bottom:20px}}@media(max-width:850px){.app{padding:18px}main{grid-template-columns:minmax(0,1fr) 265px;gap:18px}.stage{height:600px}.brand strong{font-size:18px}.guide-row strong{font-size:13px}.guide-row div>span{font-size:12px}}@media(max-width:650px){.app{padding:13px 12px}header{margin-bottom:14px}.brand{gap:9px}.brand strong{font-size:17px}.brand-mark{height:34px;width:34px;font-size:26px}.byline{font-size:12px}.version{font-size:12px;padding:5px 7px}.header-right{gap:5px}main{display:flex;flex-direction:column;gap:16px}.stage{height:min(66svh,620px);min-height:340px}.board-wrap{top:14px;bottom:34px;height:calc(100% - 48px)}.arena-top{padding:10px 14px}.touch-controls{padding:9px;gap:7px}.touch-controls button{padding:5px 3px}.stage-tag{right:9px;font-size:9px}h1{font-size:25px}.overlay p{font-size:14px}aside{display:grid;grid-template-columns:1fr 1fr;gap:0 15px}.scoreboard{padding-top:0}.score-main strong{font-size:35px}.score-sub{margin-top:9px}.score-sub strong{font-size:23px}.next-section{padding:2px 0 14px}.next-pieces{gap:5px;flex-wrap:wrap}.next-pieces canvas{width:65px;height:46px}.camera-section,.guide,.game-actions,.privacy{grid-column:1/-1}.camera-section{margin-top:13px}.guide{padding-top:16px}.guide-row{display:inline-flex;vertical-align:top;width:50%;margin:0;padding:9px 3px;gap:7px}.guide-row strong{font-size:13px}.guide-row div>span{font-size:12px;line-height:1.5}.gesture-icon{width:23px;font-size:22px}footer{line-height:1.7;gap:12px;flex-direction:column;margin-top:8px}.privacy{margin-bottom:0}}

/* V0.2 mobile gesture layer */
.overlay-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:15px}.overlay-actions .primary{margin-top:0}.overlay-actions .secondary{min-width:170px;padding:13px 18px}.distance-guide{position:absolute;z-index:6;left:14px;top:14px;display:flex;align-items:center;gap:8px;max-width:230px;padding:8px 10px;border:1px solid #ffffff1c;border-radius:10px;background:#081520bd;backdrop-filter:blur(8px);pointer-events:none}.distance-dot{width:9px;height:9px;border-radius:50%;background:#8195a4;box-shadow:0 0 0 4px #8195a41f;flex:0 0 auto}.distance-guide strong{display:block;font-size:11px;font-weight:650}.distance-guide div>span{display:block;margin-top:2px;color:#8fa8b7;font-size:9px;line-height:1.35}.distance-guide[data-state="good"] .distance-dot{background:#73e5a7;box-shadow:0 0 0 4px #73e5a722}.distance-guide[data-state="warn"] .distance-dot{background:#ffd869;box-shadow:0 0 0 4px #ffd86922}.sensitivity{margin-top:12px;padding:10px;border:1px solid var(--line);border-radius:9px;background:#1b2a38}.sensitivity-head{display:flex;justify-content:space-between;align-items:center;font-size:12px}.sensitivity-head span{color:var(--cyan)}#sensitivity{width:100%;margin:9px 0 3px;accent-color:#8bf0d9}.sensitivity-scale{display:flex;justify-content:space-between;color:#7f95a4;font-size:9px}.wechat-tip{margin:10px 0 0;padding:9px 10px;border:1px solid #ffd86945;border-radius:8px;background:#ffd86910;color:#f5df9c;font-size:11px;line-height:1.6}.wechat-tip[hidden]{display:none}
@media(max-width:650px){body{min-height:100svh}.app{padding:8px 8px calc(10px + env(safe-area-inset-bottom))}header{margin-bottom:8px}.brand strong{font-size:15px}.brand-mark{height:32px;width:32px;font-size:24px}.byline{display:none}.version{font-size:10px;padding:5px 7px}.icon-button{font-size:20px}.arena{border-radius:14px}.arena-top{padding:8px 11px;font-size:10px}.stage{height:min(61svh,560px);min-height:410px}.board-wrap{top:12px;bottom:31px;height:calc(100% - 43px);max-width:82%}.stage-tag{display:none}.feedback{font-size:11px;bottom:7px}.distance-guide{left:8px;top:8px;max-width:190px;padding:6px 8px}.distance-guide strong{font-size:10px}.distance-guide div>span{font-size:8px}.overlay-card{padding:14px 12px;max-width:330px}.eyebrow{font-size:10px}h1{font-size:23px;margin:12px 0 8px}.overlay p{font-size:12px;line-height:1.65;margin:7px 0}.overlay-actions{display:grid;grid-template-columns:1fr;gap:7px;margin-top:10px}.overlay-actions .primary,.overlay-actions .secondary{width:100%;min-width:0;margin:0;padding:11px 14px}.overlay-tip{font-size:9px;margin-top:10px}.touch-controls{position:sticky;bottom:max(0px,env(safe-area-inset-bottom));z-index:10;padding:7px;gap:5px;background:#152230f4;backdrop-filter:blur(8px)}.touch-controls button{min-height:47px;border-radius:9px;font-size:21px;padding:4px 2px}.touch-controls button span{font-size:9px}.camera-section{margin-top:9px!important;padding:12px!important;border:1px solid var(--line)!important;border-radius:12px;background:#152230}.camera-button{min-height:48px;font-weight:650}.status{margin:8px 0;font-size:11px}.sensitivity{margin-top:9px;padding:8px}.guide{padding-top:12px}.guide-row{padding:7px 2px}.guide-row strong{font-size:12px}.guide-row div>span{font-size:10px}.score-main strong{font-size:31px}.privacy{font-size:10px}.game-actions{margin-top:5px}footer{font-size:10px}.wechat-tip{font-size:10px}#video{opacity:.7}}
@media(max-width:390px){.stage{height:min(58svh,520px);min-height:385px}.board-wrap{max-width:80%}.touch-controls button{min-height:44px}.distance-guide{max-width:170px}}
/* V0.2.1: compact feedback controls */
.av-toggle{background:#223341;border-radius:8px;padding:8px 10px;min-height:44px;font-size:14px;white-space:nowrap}.av-toggle[aria-pressed=true]{border-color:#547e72;color:#b8ffee}.header-right{gap:8px;flex-wrap:wrap;justify-content:flex-end}@media(max-width:650px){header{flex-wrap:wrap;gap:10px}.header-right{width:100%;justify-content:flex-end}.header-right .version{margin-right:auto}.av-toggle{padding:6px 9px} }@media(prefers-reduced-motion:reduce){.shake{animation:none!important}button{transition:none}}