:root{--bg: #1f2933;--surface: #2b3947;--surface-2: #34465a;--text: #e6edf3;--muted: #9aa9b8;--accent: #4f9cf5;--good: #34d399;--good-bg: #14532d;--bad: #f87171;--bad-bg: #5b1d1d;--radius: 12px}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;-webkit-text-size-adjust:100%}button{font:inherit;color:inherit;cursor:pointer}.app{max-width:560px;margin:0 auto;padding:env(safe-area-inset-top) 16px calc(env(safe-area-inset-bottom) + 16px);min-height:100vh}.app-header{display:flex;align-items:center;justify-content:space-between;padding:16px 0 8px}.app-header h1{font-size:1.25rem;margin:0}.app-header nav{display:flex;gap:4px}.app-header nav button{background:transparent;border:1px solid transparent;border-radius:8px;padding:6px 12px;color:var(--muted)}.app-header nav button.active{color:var(--text);background:var(--surface)}h2{font-size:.95rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);margin:24px 0 10px}section:first-child h2{margin-top:8px}.choice-short{font-weight:700;font-size:1.05rem}.choice-name{font-size:.78rem;color:var(--muted)}.interval-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.toggle{display:flex;flex-direction:column;align-items:center;gap:2px;padding:12px 4px;background:var(--surface);border:2px solid transparent;border-radius:var(--radius)}.toggle.on{border-color:var(--accent);background:var(--surface-2)}.toggle.on .choice-name{color:var(--text)}.seg{display:flex;flex-wrap:wrap;gap:8px}.seg-btn{flex:1 1 auto;min-width:72px;padding:12px;background:var(--surface);border:2px solid transparent;border-radius:var(--radius);text-align:center}.seg-btn.on{border-color:var(--accent);background:var(--surface-2)}.start-btn{width:100%;margin-top:28px;padding:18px;font-size:1.1rem;font-weight:700;background:var(--accent);color:#08213f;border:none;border-radius:var(--radius)}.start-btn:disabled{opacity:.4}.warn{color:var(--bad);font-size:.85rem}.practice-top{display:flex;align-items:center;justify-content:space-between;color:var(--muted)}.progress{font-variant-numeric:tabular-nums}.link{background:transparent;border:none;color:var(--muted);text-decoration:underline;padding:4px}.link.danger{color:var(--bad);display:block;margin:24px auto 0}.prompt{text-align:center;margin:28px 0}.play-btn{padding:16px 28px;font-size:1.1rem;background:var(--surface-2);border:2px solid var(--accent);border-radius:999px}.hint{color:var(--muted);margin-top:16px}.choices{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.choice{display:flex;flex-direction:column;align-items:center;gap:2px;padding:16px 8px;background:var(--surface);border:2px solid transparent;border-radius:var(--radius)}.choice:disabled{opacity:.9}.choice.correct{border-color:var(--good);background:var(--good-bg)}.choice.wrong{border-color:var(--bad);background:var(--bad-bg)}.feedback{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:20px;padding:14px 16px;border-radius:var(--radius);background:var(--surface)}.feedback.ok{color:var(--good)}.feedback.no{color:var(--bad)}.next-btn{padding:12px 22px;font-weight:700;background:var(--accent);color:#08213f;border:none;border-radius:var(--radius)}.finish{display:block;margin:24px auto 0}.score{text-align:center;margin:16px 0 8px}.score-pct{display:block;font-size:3rem;font-weight:800}.score-sub{color:var(--muted)}.confusions{list-style:none;padding:0;margin:0}.confusions li{padding:10px 12px;background:var(--surface);border-radius:8px;margin-bottom:6px;font-size:.9rem}.confusions .count{color:var(--muted)}.actions{margin-top:28px}.per-interval{list-style:none;padding:0;margin:0}.per-interval li{display:flex;align-items:center;gap:10px;margin-bottom:8px}.pi-label{width:32px;font-weight:700}.pi-bar{flex:1;height:12px;background:var(--surface);border-radius:999px;overflow:hidden}.pi-fill{display:block;height:100%;background:var(--good)}.pi-num{width:72px;text-align:right;font-variant-numeric:tabular-nums;font-size:.85rem}.pi-asked{color:var(--muted)}.matrix-wrap{overflow-x:auto}.matrix{border-collapse:collapse;font-size:.8rem}.matrix th,.matrix td{width:30px;height:30px;text-align:center;border:1px solid var(--bg);color:var(--muted)}.matrix tbody th,.matrix thead th{font-weight:700;color:var(--text)}.matrix .corner{position:relative;width:64px;font-size:.6rem;font-weight:400;color:var(--muted)}.matrix .played-axis,.matrix .answered-axis{display:block}.cell{font-variant-numeric:tabular-nums;color:var(--text)}.cell.hit{background:var(--good-bg);color:var(--good)}.cell.miss{background:var(--bad-bg);color:var(--bad)}.history.empty,.history .empty{color:var(--muted);text-align:center;margin-top:40px}.update-toast{position:fixed;left:50%;bottom:20px;transform:translate(-50%);display:flex;align-items:center;gap:12px;background:var(--surface-2);border:1px solid var(--accent);padding:12px 16px;border-radius:var(--radius)}.update-toast button{background:var(--accent);color:#08213f;border:none;border-radius:8px;padding:8px 14px;font-weight:700}.app-footer{margin-top:24px;padding:12px 0;text-align:center;font-size:11px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;opacity:.5}