:root{--bg:#0d1117;--surface:#161b22;--surface-2:#1c2129;--border:#2a313c;--text:#e6edf3;--muted:#9aa5b1;--accent:#58a6ff;--correct:#3fb950;--warn:#d29922;--danger:#f85149;--radius:14px}*{box-sizing:border-box}html,body,#root{height:100%}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}sub,sup{font-size:.72em;line-height:0}.muted{color:var(--muted)}.small{font-size:.85rem}button{font:inherit;cursor:pointer}button:disabled{cursor:default}@media (prefers-reduced-motion:reduce){*{transition-duration:1ms!important;animation:none!important}}.student{max-width:680px;padding:18px 16px calc(110px + env(safe-area-inset-bottom));flex-direction:column;min-height:100%;margin:0 auto;display:flex}.student-head{margin-bottom:18px}.head-row{justify-content:space-between;align-items:baseline;gap:12px;display:flex}.head-title{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.progress{background:var(--surface-2);border-radius:999px;height:6px;margin-top:10px;overflow:hidden}.progress-fill{background:var(--accent);border-radius:999px;height:100%;transition:width .3s}.q-text{margin:0 0 18px;font-size:clamp(1.2rem,4.6vw,1.6rem);font-weight:650;line-height:1.35}.q-image{border-radius:var(--radius);background:#fff;max-width:100%;margin-bottom:18px;display:block}.options{gap:12px;display:grid}.option{text-align:left;width:100%;min-height:64px;color:var(--text);background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);flex-wrap:wrap;align-items:center;gap:10px 14px;padding:14px 16px;transition:border-color .14s,background-color .14s,transform 80ms;display:flex}button.option:active:not(:disabled){transform:scale(.985)}.option.chosen{border-color:var(--accent);background:color-mix(in srgb, var(--accent) 14%, var(--surface))}button.option:disabled{opacity:.6}.option.correct{border-color:var(--correct);background:color-mix(in srgb, var(--correct) 14%, var(--surface))}.option.wrong{border-color:var(--danger);background:color-mix(in srgb, var(--danger) 10%, var(--surface))}.option.dimmed{opacity:.55}.option-key{background:var(--surface-2);border-radius:9px;flex:none;place-items:center;width:34px;height:34px;font-weight:700;display:grid}.option.chosen .option-key{background:var(--accent);color:#06101f}.option.correct .option-key{background:var(--correct);color:#06101f}.option.wrong .option-key{background:var(--danger);color:#06101f}.option-text{flex:1;min-width:0;font-size:1.05rem;line-height:1.4}.option-image{background:#fff;border-radius:8px;max-width:100%;margin-top:8px;display:block}.option-tag{white-space:nowrap;flex:none;font-size:.85rem;font-weight:700}.option-tag.good{color:var(--correct)}.option-tag.bad{color:var(--danger)}.verdict{border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);gap:14px;margin-top:18px;padding:16px;display:flex}.verdict.good{border-color:color-mix(in srgb, var(--correct) 55%, transparent)}.verdict-mark{font-size:1.6rem;line-height:1}.verdict.good .verdict-mark{color:var(--correct)}.verdict.bad .verdict-mark{color:var(--danger)}.explanation{color:var(--muted);margin:6px 0 0;line-height:1.55}.notice{background:color-mix(in srgb, var(--warn) 12%, var(--surface));border:1px solid color-mix(in srgb, var(--warn) 45%, transparent);border-radius:10px;margin:16px 0 0;padding:12px 14px;line-height:1.45}.notice.bad{background:color-mix(in srgb, var(--danger) 10%, var(--surface));border-color:color-mix(in srgb, var(--danger) 45%, transparent)}.center-card{text-align:center;margin:auto;padding:32px 8px}.center-card h1{margin:0 0 12px;font-size:1.7rem;line-height:1.25}.center-card .primary.inline,.center-card .ghost{margin-top:18px}.rules{text-align:left;max-width:34rem;color:var(--muted);margin:20px auto 6px;padding-left:1.2em;line-height:1.55}.rules li{margin-bottom:6px}.rules strong{color:var(--text)}.score-big{font-variant-numeric:tabular-nums;margin:8px 0;font-size:4.5rem;font-weight:750}.score-of{color:var(--muted);font-size:.45em;font-weight:600}.stack{flex-direction:column;align-items:center;gap:4px;display:flex}.review-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;padding:14px 16px}.review-item p{margin:0 0 8px}.review-q{font-weight:600;line-height:1.4}.review-good{color:var(--correct)}.review-bad{color:var(--danger)}.actions{padding:12px 16px calc(12px + env(safe-area-inset-bottom));background:linear-gradient(to top, var(--bg) 70%, transparent);gap:10px;max-width:680px;margin:0 auto;display:flex;position:fixed;bottom:0;left:0;right:0}.primary{border-radius:var(--radius);background:var(--accent);color:#06101f;border:none;flex:1;min-height:56px;font-size:1.1rem;font-weight:700}.primary.inline{flex:none;padding:0 32px}.primary:active:not(:disabled){transform:scale(.99)}.primary:disabled{opacity:.45}.ghost{background:var(--surface-2);border:1px solid var(--border);min-height:46px;color:var(--text);border-radius:10px;padding:0 18px}.link{color:var(--accent);white-space:nowrap;background:0 0;border:none;padding:0;font-size:.9rem}