:root{--ui-scale: 1;--bg: #0f1113;--surface: #16191c;--surface-2: #1c2024;--surface-3: #22272c;--border: #272d33;--border-soft: #1f2429;--text: #cfd6dd;--text-dim: #8a929b;--text-faint: #5f6871;--accent: #6f9e8a;--accent-soft: #6f9e8a26;--warn: #b0925f;--danger: #a96b6b;--radius: 12px;--radius-sm: 8px;--gap: .75rem;color-scheme:dark;font-size:calc(16px * var(--ui-scale))}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{margin:0;padding:0;min-height:100%}body{background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,sans-serif;font-size:1rem;line-height:1.5;-webkit-font-smoothing:antialiased;overscroll-behavior-y:contain}button,select,input{font:inherit;color:inherit}.app{min-height:100dvh;display:flex;flex-direction:column;padding-bottom:env(safe-area-inset-bottom)}.shell{width:100%;max-width:56rem;margin:0 auto;padding:0 clamp(.75rem,3vw,1.5rem);flex:1;display:flex;flex-direction:column;gap:var(--gap)}.topbar{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 92%,transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border-soft);padding-top:env(safe-area-inset-top)}.topbar-inner{max-width:56rem;margin:0 auto;padding:.6rem clamp(.75rem,3vw,1.5rem);display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}.brand{font-size:.95rem;font-weight:600;letter-spacing:.02em;color:var(--text-dim);margin-right:auto}.tabs{display:flex;gap:.25rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.2rem}.tab{background:none;border:0;border-radius:6px;padding:.4rem .85rem;font-size:.85rem;color:var(--text-dim);cursor:pointer;transition:background .15s,color .15s}.tab:hover{color:var(--text)}.tab[aria-selected=true]{background:var(--surface-3);color:var(--text)}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:clamp(.75rem,2.5vw,1.1rem)}.panel+.panel{margin-top:var(--gap)}.panel-title{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-faint);margin:0 0 .6rem;font-weight:600}.row{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center}.grow{flex:1 1 8rem;min-width:0}.muted{color:var(--text-dim);font-size:.85rem}.faint{color:var(--text-faint);font-size:.8rem}.field{display:flex;flex-direction:column;gap:.3rem;flex:1 1 9rem;min-width:0}.field>label{font-size:.75rem;color:var(--text-faint);letter-spacing:.04em}select,input[type=number]{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.55rem .7rem;width:100%;min-height:2.6rem}select:focus-visible,input:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:1px}input[type=range]{width:100%;accent-color:var(--accent);height:1.6rem}.btn{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.55rem 1rem;min-height:2.6rem;cursor:pointer;transition:background .15s,border-color .15s;white-space:nowrap}.btn:hover:not(:disabled){background:var(--surface-3)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--accent-soft);border-color:color-mix(in srgb,var(--accent) 45%,transparent);color:color-mix(in srgb,var(--accent) 80%,white)}.btn-lg{padding:.8rem 1.6rem;min-height:3.2rem;font-size:1rem}.btn-icon{min-width:3.2rem;display:inline-flex;align-items:center;justify-content:center}.group-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(5.5rem,1fr));gap:.5rem}.group-cell{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.55rem .4rem;cursor:pointer;text-align:center;display:flex;flex-direction:column;gap:.15rem;min-height:3.6rem;justify-content:center;transition:background .15s,border-color .15s}.group-cell:hover{background:var(--surface-3)}.group-cell[aria-pressed=true]{border-color:color-mix(in srgb,var(--accent) 50%,transparent);background:var(--accent-soft)}.group-cell .n{font-size:.95rem;font-variant-numeric:tabular-nums}.group-cell .sub{font-size:.65rem;color:var(--text-faint);font-variant-numeric:tabular-nums}.dot{width:.4rem;height:.4rem;border-radius:50%;background:var(--accent);margin:0 auto}.stage{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:clamp(1.25rem,6vw,2.5rem) 1rem;text-align:center;display:flex;flex-direction:column;gap:.6rem;min-height:clamp(11rem,34vh,16rem);justify-content:center}.word{font-size:clamp(1.9rem,9vw,3.2rem);font-weight:600;line-height:1.15;word-break:break-word;letter-spacing:-.01em}.translation{font-size:clamp(1.05rem,5vw,1.6rem);color:var(--text-dim);min-height:1.6em;word-break:break-word;transition:opacity .2s}.translation.hidden{opacity:0}.counter{font-size:.8rem;color:var(--text-faint);font-variant-numeric:tabular-nums}.speaking{font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);min-height:1rem}.controls{display:flex;gap:.5rem;justify-content:center;flex-wrap:wrap}.progress{height:3px;background:var(--surface-3);border-radius:2px;overflow:hidden}.progress>i{display:block;height:100%;background:var(--accent);transition:width .25s}.options{display:grid;gap:.5rem;grid-template-columns:1fr}@media (min-width: 30rem){.options{grid-template-columns:1fr 1fr}}.option{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.85rem 1rem;min-height:3.2rem;text-align:left;cursor:pointer;transition:background .15s,border-color .15s;word-break:break-word}.option:hover:not(:disabled){background:var(--surface-3)}.option.correct{border-color:color-mix(in srgb,var(--accent) 55%,transparent);background:var(--accent-soft)}.option.wrong{border-color:color-mix(in srgb,var(--danger) 55%,transparent);background:color-mix(in srgb,var(--danger) 14%,transparent)}.score{font-variant-numeric:tabular-nums;font-size:.85rem;color:var(--text-dim)}.notice{border:1px solid var(--border);background:var(--surface-2);border-radius:var(--radius-sm);padding:.7rem .85rem;font-size:.85rem;color:var(--text-dim)}.notice.error{border-color:color-mix(in srgb,var(--danger) 45%,transparent);color:color-mix(in srgb,var(--danger) 75%,white)}.spread{display:flex;justify-content:space-between;align-items:center;gap:.5rem;flex-wrap:wrap}.footer{padding:1.25rem 0 1.75rem;text-align:center;color:var(--text-faint);font-size:.72rem}@media (prefers-reduced-motion: reduce){*{transition:none!important;animation:none!important}}.article{color:var(--text-faint);font-weight:400}.example{font-size:clamp(.8rem,3.4vw,.95rem);color:var(--text-faint);font-style:italic;line-height:1.45;max-width:34rem;margin:0 auto;transition:opacity .2s}.example.hidden{opacity:0}.source-note{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;font-size:.78rem;color:var(--text-faint);margin:0 0 var(--gap)}.badge{border:1px solid var(--border);border-radius:999px;padding:.1rem .55rem;font-size:.7rem;letter-spacing:.03em;color:var(--text-dim)}.badge.official{border-color:color-mix(in srgb,var(--accent) 45%,transparent);color:color-mix(in srgb,var(--accent) 80%,white);background:var(--accent-soft)}