:root{--bg: #f6f7fb;--surface: #ffffff;--surface-2: #eef0f6;--border: #dcdfea;--text: #171a21;--muted: #616a7d;--accent: #4f46e5;--accent-text: #ffffff;--good: #15803d;--warn: #b45309;--bad: #b91c1c;--radius: 14px;--shadow: 0 1px 2px rgba(16, 20, 32, .06), 0 4px 16px rgba(16, 20, 32, .06);color-scheme:light dark}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--bg: #0f1117;--surface: #191d27;--surface-2: #222736;--border: #2e3444;--text: #eef1f7;--muted: #9aa4b8;--accent: #7c74ff;--accent-text: #0f1117;--good: #4ade80;--warn: #fbbf24;--bad: #f87171;--shadow: 0 1px 2px rgba(0, 0, 0, .4)}}:root[data-theme=dark]{--bg: #0f1117;--surface: #191d27;--surface-2: #222736;--border: #2e3444;--text: #eef1f7;--muted: #9aa4b8;--accent: #7c74ff;--accent-text: #0f1117;--good: #4ade80;--warn: #fbbf24;--bad: #f87171;--shadow: 0 1px 2px rgba(0, 0, 0, .4)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased;overscroll-behavior-y:none}button,input,select,textarea{font:inherit;color:inherit}a{color:var(--accent);text-decoration:none}.app{display:flex;flex-direction:column;min-height:100%}.page{width:100%;max-width:720px;margin:0 auto;padding:16px 16px calc(32px + env(safe-area-inset-bottom));flex:1}.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:12px;padding:max(10px,env(safe-area-inset-top)) 16px 10px;background:color-mix(in srgb,var(--bg) 88%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}.topbar h1{font-size:17px;margin:0;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topbar .who{font-size:13px;color:var(--muted)}.center-screen{min-height:100dvh;display:grid;place-items:center;padding:24px}.stack{display:flex;flex-direction:column;gap:12px}.row{display:flex;align-items:center;gap:10px}.spread{display:flex;align-items:center;justify-content:space-between;gap:10px}.grow{flex:1;min-width:0}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}.card.tap{cursor:pointer;transition:transform .08s ease;text-align:left;width:100%;display:block}.card.tap:active{transform:scale(.99)}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--border);background:var(--surface);border-radius:12px;padding:12px 16px;min-height:46px;font-weight:600;cursor:pointer;transition:background .12s ease,transform .06s 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18%,transparent);color:var(--accent)}.chip.good{color:var(--good)}.chip.warn{color:var(--warn)}.chip.bad{color:var(--bad)}.banner{border-radius:12px;padding:11px 13px;font-size:14px;border:1px solid var(--border);background:var(--surface-2)}.banner.bad{color:var(--bad);border-color:color-mix(in srgb,var(--bad) 40%,var(--border))}.banner.good{color:var(--good);border-color:color-mix(in srgb,var(--good) 40%,var(--border))}.empty{text-align:center;color:var(--muted);padding:40px 20px}.grid-profiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:14px;width:min(560px,100%)}.avatar{width:76px;height:76px;margin:0 auto 10px;border-radius:50%;display:grid;place-items:center;font-size:30px;font-weight:700;background:var(--accent);color:var(--accent-text)}.tabs{display:flex;gap:4px;background:var(--surface-2);padding:4px;border-radius:12px}.tabs button{flex:1;border:0;background:transparent;border-radius:9px;padding:9px;font-weight:600;font-size:14px;cursor:pointer;color:var(--muted)}.tabs button[aria-selected=true]{background:var(--surface);color:var(--text);box-shadow:var(--shadow)}.study{display:flex;flex-direction:column;min-height:100dvh}.study-main{flex:1;display:flex;flex-direction:column;justify-content:center;gap:16px;padding:16px;max-width:720px;width:100%;margin:0 auto}.face{background:var(--surface);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);padding:28px 22px;min-height:190px;display:grid;place-items:center;text-align:center;font-size:21px;line-height:1.45;cursor:pointer;-webkit-user-select:none;user-select:none}.face.answer{background:var(--surface-2);cursor:default;font-size:19px}.cloze-blank{display:inline-block;min-width:60px;border-bottom:2px solid 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