*{box-sizing:border-box;margin:0;padding:0}:root{--primary:#6366f1;--primary-hover:#4f46e5;--primary-light:#6366f11a;--success:#22c55e;--warning:#f59e0b;--danger:#ef4444;--bg:#f8fafc;--card-bg:#fff;--text:#334155;--text-light:#64748b;--text-dark:#0f172a;--border:#e2e8f0;--radius:12px;--shadow:0 1px 3px #00000014, 0 1px 2px #0000000f;--shadow-lg:0 10px 25px #00000014;color:var(--text);background:var(--bg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif;font-size:15px}body{margin:0}.app{flex-direction:column;min-height:100vh;display:flex}.nav{background:var(--card-bg);border-bottom:1px solid var(--border);z-index:100;height:56px;box-shadow:var(--shadow);justify-content:space-between;align-items:center;padding:0 24px;display:flex;position:sticky;top:0}.nav-brand{color:var(--primary);font-size:18px;font-weight:700}.nav-links{gap:8px;display:flex}.nav-links a{color:var(--text-light);border-radius:8px;padding:6px 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h1{margin-bottom:24px;font-size:28px}.subject-stats-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px;margin-bottom:32px;display:grid}.subject-stat-card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}.subj-stat-icon{font-size:28px}.subj-stat-name{color:var(--text-dark);margin:4px 0;font-weight:600}.subj-stat-bar-bg{background:var(--border);border-radius:3px;height:6px;margin:8px 0;overflow:hidden}.subj-stat-bar{background:var(--primary);border-radius:3px;height:100%}.subj-stat-count{color:var(--text-light);font-size:13px}.attempt-mini-list{border-top:1px solid var(--border);margin-top:8px;padding-top:8px}.attempt-mini{align-items:center;gap:12px;padding:4px 0;font-size:13px;display:flex}.attempt-score{font-weight:700}.practice-actions{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.practice-score-bar{background:var(--card-bg);box-shadow:var(--shadow);border-left:4px solid 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.2s;display:flex}.q-dot:hover{border-color:var(--primary)}.q-dot-active{border-color:var(--primary);background:var(--primary);color:#fff}.q-dot-answered{border-color:var(--primary);background:var(--primary-light);color:var(--primary)}.q-dot-correct{border-color:var(--success);color:var(--success);background:#22c55e26}.q-dot-wrong{border-color:var(--danger);color:var(--danger);background:#ef444426}.page-center{flex-direction:column;justify-content:center;align-items:center;gap:16px;min-height:300px;display:flex}h2{color:var(--text-dark);margin-bottom:12px;font-size:20px}