:root{--bg: #f2f4f7;--surface: #ffffff;--surface-2: #f7f8fa;--text: #101418;--text-dim: #7a8494;--line: #e4e8ee;--accent: #2f8fff;--right: #26bd6c;--wrong: #f0524d;--shadow: 0 12px 32px rgba(16, 20, 24, .14);--radius: 24px}@media (prefers-color-scheme: dark){:root{--bg: #14171c;--surface: #1e232b;--surface-2: #262c35;--text: #eef1f5;--text-dim: #8b95a4;--line: #2f3742;--shadow: 0 12px 32px rgba(0, 0, 0, .45)}}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.4 -apple-system,BlinkMacSystemFont,SF Pro Text,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased;overscroll-behavior:none}button{font:inherit;color:inherit}.app{height:100%;max-width:420px;margin:0 auto;padding:12px 16px calc(12px + env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:12px}.topbar{display:flex;align-items:center;justify-content:space-between}.topbar__meta{display:flex;align-items:baseline;gap:6px}.topbar__count{font-size:22px;font-weight:700;letter-spacing:-.02em}.topbar__label{font-size:13px;color:var(--text-dim)}.board{flex:1;display:flex;align-items:center;justify-content:center;min-height:0}.hints{margin:0;text-align:center;font-size:12px;color:var(--text-dim)}.stack{position:relative;width:100%;aspect-ratio:3 / 4;max-height:100%}.stack--empty{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;border:2px dashed var(--line);border-radius:var(--radius)}.empty__title{margin:0;font-weight:600}.empty__sub{margin:0;font-size:13px;color:var(--text-dim)}.stack__slot{position:absolute;top:0;right:0;bottom:0;left:0;will-change:transform}.stack__slot--behind{pointer-events:none}.card{position:relative;width:100%;height:100%;perspective:1400px;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-tap-highlight-color:transparent}.card__inner{position:relative;width:100%;height:100%;transform-style:preserve-3d}.face{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;padding:20px;border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow);backface-visibility:hidden;-webkit-backface-visibility:hidden}.face--back{transform:rotateY(180deg);align-items:center;justify-content:center;gap:10px;background:linear-gradient(160deg,var(--surface) 0%,var(--surface-2) 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8px;border-radius:999px;background:var(--surface-2);font-size:11px;color:var(--text-dim)}.badge--muted{background:transparent}.streak{display:flex;gap:4px;margin-left:auto}.streak__dot{width:6px;height:6px;border-radius:50%;background:var(--line)}.streak__dot--on{background:var(--right)}.hold-ring{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;pointer-events:none}.hold-ring__rect{fill:none;stroke:var(--accent);stroke-width:2;vector-effect:non-scaling-stroke;stroke-dasharray:1;stroke-dashoffset:1;opacity:0;transition-property:stroke-dashoffset,opacity;transition-timing-function:linear}.hold-ring__rect--on{stroke-dashoffset:0;opacity:1}.verdict{position:absolute;top:24px;padding:6px 14px;border-radius:10px;border:2px solid 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ease}.round-btn:active{transform:scale(.92)}.round-btn--right{color:var(--right)}.round-btn--wrong{color:var(--wrong)}.icon-btn{width:42px;height:42px;border-radius:50%;border:none;background:transparent;color:var(--text-dim);font-size:20px;cursor:pointer}.icon-btn:disabled{opacity:.3;cursor:default}.icon-btn:not(:disabled):active{background:var(--surface-2)}.sheet__backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:10;display:flex;align-items:flex-end;justify-content:center;background:#00000073}.sheet{width:100%;max-width:420px;max-height:92vh;overflow-y:auto;padding:8px 20px calc(20px + env(safe-area-inset-bottom));border-radius:24px 24px 0 0;background:var(--surface)}.sheet__grip{width:38px;height:4px;margin:0 auto 12px;border-radius:2px;background:var(--line)}.sheet__title{margin:0 0 16px;font-size:19px}.sheet__stats{margin:4px 0 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auto;padding-inline:16px;color:var(--wrong)}.btn:disabled{opacity:.4;cursor:default}.gate{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;padding:24px;text-align:center;color:var(--text-dim);font-size:14px}.gate__title{margin:0;font-size:18px;font-weight:600;color:var(--text)}.gate__sub{margin:0}