:root{--bg: #f4f6fb;--surface: #ffffff;--surface-2: #eef1f8;--ink: #1b2337;--ink-soft: #55607a;--muted: #8a93a8;--line: #e3e7f0;--accent: #4f6df5;--accent-ink: #ffffff;--accent-soft: #e7ecfe;--new: #e5e8f1;--new-ink: #8a93a8;--learning: #f6cd84;--learning-ink: #7a5518;--mastered: #5ac79a;--mastered-ink: #0f5238;--danger: #e06a6a;--shadow: 0 1px 2px rgba(20, 28, 51, .06), 0 8px 24px rgba(20, 28, 51, .08);--shadow-lg: 0 12px 40px rgba(20, 28, 51, .16);--radius: 18px;--radius-sm: 12px;--font: ui-rounded, "SF Pro Rounded", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;--ease: cubic-bezier(.22, .61, .36, 1)}@media(prefers-color-scheme:dark){:root{--bg: #0f1320;--surface: #191f30;--surface-2: #212840;--ink: #eef1f8;--ink-soft: #b3bcd2;--muted: #7f89a3;--line: #2b3247;--accent: #7d96ff;--accent-ink: #0f1320;--accent-soft: #26304f;--new: #2a3145;--new-ink: #7f89a3;--learning: #d8a85a;--learning-ink: #241a06;--mastered: #4bb488;--mastered-ink: #05271a;--shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px rgba(0, 0, 0, .4);--shadow-lg: 0 16px 50px rgba(0, 0, 0, .5)}}*{box-sizing:border-box}html,body{margin:0;padding:0;min-height:100%}body{font-family:var(--font);background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}#app{min-height:100dvh;display:flex;flex-direction:column}button{font-family:inherit;cursor:pointer}.screen{flex:1;width:100%;max-width:480px;margin:0 auto;padding:24px 20px calc(24px + env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:20px}.screen-wide{max-width:1080px}.stack{display:flex;flex-direction:column;gap:16px}.row{display:flex;align-items:center;gap:12px}.row-between{display:flex;align-items:center;justify-content:space-between;gap:12px}.spacer{flex:1}.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:-.01em}.brand-mark{width:34px;height:34px;border-radius:10px;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-size:20px;font-weight:800}h1{font-size:26px;line-height:1.2;margin:0;letter-spacing:-.02em}h2{font-size:19px;margin:0;letter-spacing:-.01em}p{margin:0;color:var(--ink-soft);line-height:1.5}.muted{color:var(--muted)}.label{font-size:13px;font-weight:700;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.04em}.btn{border:none;border-radius:999px;padding:14px 22px;font-size:16px;font-weight:700;background:var(--surface-2);color:var(--ink);transition:transform .12s var(--ease),background .2s var(--ease),opacity .2s var(--ease)}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);color:var(--accent-ink)}.btn-ghost{background:transparent;color:var(--accent)}.btn-danger{background:transparent;color:var(--danger)}.btn-block{width:100%}.btn-lg{padding:18px 24px;font-size:18px}input,select{font-family:inherit;font-size:16px;color:var(--ink);background:var(--surface);border:1.5px solid var(--line);border-radius:var(--radius-sm);padding:12px 14px;width:100%;transition:border .15s var(--ease)}input:focus,select:focus{outline:none;border-color:var(--accent)}.field{display:flex;flex-direction:column;gap:6px}.notice{border-radius:var(--radius-sm);padding:12px 14px;font-size:14px;font-weight:600}.notice-error{background:color-mix(in srgb,var(--danger) 14%,transparent);color:var(--danger)}.notice-soft{background:var(--accent-soft);color:var(--accent)}.badge{display:inline-flex;align-items:center;gap:6px;border-radius:999px;padding:4px 10px;font-size:12px;font-weight:700}.badge-stopped{background:color-mix(in srgb,var(--danger) 16%,transparent);color:var(--danger)}.badge-stalled{background:color-mix(in srgb,var(--learning) 34%,transparent);color:var(--learning-ink)}.badge-soft{background:var(--surface-2);color:var(--ink-soft)}.center{text-align:center}.title-emoji{font-size:44px;line-height:1}.timerbar{height:8px;border-radius:999px;background:var(--surface-2);overflow:hidden}.timerbar-fill{height:100%;width:0%;background:linear-gradient(90deg,var(--accent),color-mix(in srgb,var(--accent) 60%,var(--mastered)));border-radius:999px;transition:width .9s linear}.question{text-align:center;font-size:clamp(44px,16vw,76px);font-weight:800;letter-spacing:-.02em;padding:12px 0}.answer-display{text-align:center;font-size:40px;font-weight:800;min-height:52px;color:var(--accent);letter-spacing:.06em}.keypad{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.key{border:none;border-radius:var(--radius-sm);background:var(--surface);box-shadow:var(--shadow);font-size:28px;font-weight:700;color:var(--ink);padding:18px 0;transition:transform .08s var(--ease),background .15s var(--ease)}.key:active{transform:scale(.95);background:var(--surface-2)}.key-accent{background:var(--accent);color:var(--accent-ink)}.wheel{display:flex;justify-content:center;gap:10px}.wheel-col{height:168px;width:68px;overflow-y:scroll;scroll-snap-type:y mandatory;scrollbar-width:none;-ms-overflow-style:none;border-radius:var(--radius-sm);background:var(--surface-2);position:relative}.wheel-col::-webkit-scrollbar{display:none}.wheel-item{height:56px;scroll-snap-align:center;display:grid;place-items:center;font-size:30px;font-weight:800;color:var(--muted);transition:color .15s var(--ease),transform .15s var(--ease)}.wheel-item.is-active{color:var(--accent);transform:scale(1.08)}.wheel-frame{position:relative}.wheel-frame:before,.wheel-frame:after{content:"";position:absolute;left:0;right:0;height:56px;pointer-events:none;z-index:1}.wheel-frame:before{top:0;background:linear-gradient(var(--surface),transparent)}.wheel-frame:after{bottom:0;background:linear-gradient(transparent,var(--surface))}.emoji-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}.emoji-cell{aspect-ratio:1;border:2px solid transparent;border-radius:12px;background:var(--surface-2);font-size:24px;display:grid;place-items:center;transition:transform .1s var(--ease),border .15s var(--ease)}.emoji-cell.is-active{border-color:var(--accent);transform:scale(1.05)}.pin-dots{display:flex;justify-content:center;gap:14px}.pin-dot{width:16px;height:16px;border-radius:999px;background:var(--surface-2);transition:background .15s var(--ease),transform .15s var(--ease)}.pin-dot.is-filled{background:var(--accent);transform:scale(1.1)}.roster{display:grid;grid-template-columns:repeat(auto-fill,minmax(84px,1fr));gap:12px}.roster-item{border:none;border-radius:var(--radius-sm);background:var(--surface);box-shadow:var(--shadow);padding:14px 6px;display:flex;flex-direction:column;align-items:center;gap:4px;transition:transform .1s var(--ease)}.roster-item:active{transform:scale(.96)}.roster-emoji{font-size:30px}.roster-label{font-size:13px;font-weight:700;color:var(--ink-soft)}.code-display{font-size:46px;font-weight:800;letter-spacing:.14em;text-align:center;color:var(--accent)}.qr{display:grid;place-items:center;padding:16px;background:#fff;border-radius:var(--radius-sm)}.qr svg{width:220px;height:220px}.table{width:100%;border-collapse:collapse;font-size:14px}.table th{text-align:left;font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);padding:10px 12px;border-bottom:1.5px solid var(--line)}.table td{padding:12px;border-bottom:1px solid var(--line)}.table tbody tr{transition:background .12s var(--ease);cursor:pointer}.table tbody tr:hover{background:var(--surface-2)}.table-scroll{overflow-x:auto;border-radius:var(--radius)}.heatgrid{display:grid;gap:3px;overflow-x:auto}.heatcell{aspect-ratio:1;border-radius:5px;min-width:22px;display:grid;place-items:center;font-size:10px;font-weight:700}.heat-new{background:var(--new);color:var(--new-ink)}.heat-learning{background:var(--learning);color:var(--learning-ink)}.heat-mastered{background:var(--mastered);color:var(--mastered-ink)}.heat-axis{font-size:11px;font-weight:700;color:var(--muted);display:grid;place-items:center}.legend{display:flex;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--ink-soft)}.legend-swatch{width:14px;height:14px;border-radius:4px;display:inline-block;vertical-align:-2px;margin-right:6px}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px}.stat{background:var(--surface);border-radius:var(--radius-sm);box-shadow:var(--shadow);padding:16px}.stat-value{font-size:28px;font-weight:800;letter-spacing:-.02em}.stat-label{font-size:13px;color:var(--muted);font-weight:600}.chart{width:100%;height:160px}.chart line,.chart polyline,.chart path{vector-effect:non-scaling-stroke}.tabs{display:flex;gap:8px;background:var(--surface-2);padding:4px;border-radius:999px}.tab{border:none;background:transparent;border-radius:999px;padding:8px 16px;font-weight:700;font-size:14px;color:var(--ink-soft);flex:1;transition:background .15s var(--ease),color .15s var(--ease)}.tab.is-active{background:var(--surface);color:var(--accent);box-shadow:var(--shadow)}.toast-host{position:fixed;left:0;right:0;bottom:calc(20px + env(safe-area-inset-bottom));display:flex;flex-direction:column;align-items:center;gap:8px;pointer-events:none;z-index:50}.toast{background:var(--ink);color:var(--bg);padding:12px 18px;border-radius:999px;font-weight:700;font-size:14px;box-shadow:var(--shadow-lg);animation:toast-in .2s var(--ease)}@keyframes toast-in{0%{opacity:0;transform:translateY(8px)}}.fade-in{animation:fade-in .25s var(--ease)}@keyframes fade-in{0%{opacity:0;transform:translateY(6px)}}.pop{animation:pop .3s var(--ease)}@keyframes pop{0%{transform:scale(.8);opacity:0}60%{transform:scale(1.06)}to{transform:scale(1);opacity:1}}.dialog-backdrop{position:fixed;inset:0;background:#0f132080;display:grid;place-items:center;padding:20px;z-index:40;animation:fade-in .15s var(--ease)}.dialog{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:24px;width:100%;max-width:380px;display:flex;flex-direction:column;gap:16px}.loading{display:grid;place-items:center;padding:48px;color:var(--muted)}.spinner{width:28px;height:28px;border:3px solid var(--surface-2);border-top-color:var(--accent);border-radius:999px;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(prefers-reduced-motion:reduce){*{animation-duration:.001ms!important;transition-duration:.001ms!important}}