:root{--bg:#f4f6fb;--surface:#fff;--text:#1a1d26;--text-secondary:#6b7280;--border:#e5e8f0;--primary:#2563eb;--primary-light:#dbeafe;--success:#059669;--success-bg:#d1fae5;--danger:#dc2626;--danger-bg:#fee2e2;--warn:#d97706;--radius:14px;--shadow:0 2px 12px #0f172a14;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Helvetica Neue,sans-serif;line-height:1.5}*{box-sizing:border-box;margin:0;padding:0}body{min-height:100dvh;overflow-x:hidden}#root{min-height:100dvh}button{font:inherit;cursor:pointer;background:0 0;border:none}.page{max-width:640px;padding:16px 16px calc(16px + env(safe-area-inset-bottom));min-height:100dvh;margin:0 auto}.loading-screen{min-height:100dvh;color:var(--text-secondary);flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex}.spinner{border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;width:36px;height:36px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.hero{padding:24px 0 32px}.hero-label{color:var(--primary);letter-spacing:.05em;margin-bottom:8px;font-size:13px;font-weight:600}.hero h1{font-size:28px;font-weight:700;line-height:1.2}.hero-desc{color:var(--text-secondary);margin-top:10px;font-size:15px}.subject-list{flex-direction:column;gap:14px;display:flex}.subject-card{background:var(--surface);border-radius:var(--radius);text-align:left;box-shadow:var(--shadow);border:2px solid #0000;padding:20px;transition:transform .15s,border-color .15s}.subject-card:not(.disabled):active{border-color:var(--accent,var(--primary));transform:scale(.98)}.subject-card.disabled{opacity:.65}.subject-top{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}.subject-short{background:color-mix(in srgb, var(--accent,var(--primary)) 12%, white);width:40px;height:40px;color:var(--accent,var(--primary));border-radius:10px;justify-content:center;align-items:center;font-size:14px;font-weight:700;display:inline-flex}.status{border-radius:20px;padding:4px 10px;font-size:12px;font-weight:600}.status.ready{background:var(--success-bg);color:var(--success)}.status.soon{color:var(--text-secondary);background:#f3f4f6}.subject-card h2{margin-bottom:6px;font-size:20px}.subject-stats{color:var(--text-secondary);flex-wrap:wrap;gap:6px;font-size:14px;display:flex}.subject-hint{color:var(--text-secondary);font-size:13px}.guide-entry{--accent:#0d9488;border:1px solid #0d94882e}.guide-entry .subject-short{color:#0d9488;background:#e2f2f1}.guide-status{color:var(--text-secondary);flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:48px 0;display:flex}.guide-error{color:var(--danger)}.markdown-body{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 18px;font-size:15px;line-height:1.7;overflow-x:auto}.markdown-body>:first-child{margin-top:0}.markdown-body>:last-child{margin-bottom:0}.markdown-body h1{border-bottom:1px solid var(--border);margin:0 0 14px;padding-bottom:10px;font-size:22px;font-weight:700;line-height:1.3}.markdown-body h2{color:var(--text);margin:28px 0 12px;font-size:18px;font-weight:700}.markdown-body h3{margin:20px 0 10px;font-size:16px;font-weight:650}.markdown-body h4{margin:16px 0 8px;font-size:15px;font-weight:650}.markdown-body p{color:var(--text);margin:0 0 12px}.markdown-body strong{color:var(--text);font-weight:700}.markdown-body blockquote{color:var(--text-secondary);background:#f0fdfa;border-left:3px solid #0d9488;border-radius:0 8px 8px 0;margin:12px 0;padding:10px 14px}.markdown-body blockquote p{color:inherit;margin:0}.markdown-body ul,.markdown-body ol{margin:0 0 12px;padding-left:1.4em}.markdown-body li{margin:4px 0}.markdown-body li+li{margin-top:6px}.markdown-body hr{border:none;border-top:1px 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.15s;display:flex}.option:active:not(.correct):not(.wrong){background:var(--primary-light)}.option.selected{border-color:var(--primary);background:var(--primary-light)}.option.correct{border-color:var(--success);background:var(--success-bg)}.option.wrong{border-color:var(--danger);background:var(--danger-bg)}.option-key{border:1px solid var(--border);background:#fff;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:14px;font-weight:700;display:flex}.option.selected .option-key{background:var(--primary);color:#fff;border-color:var(--primary)}.option.correct .option-key{background:var(--success);color:#fff;border-color:var(--success)}.option.wrong 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16px;display:flex}.dot{background:var(--border);border-radius:50%;width:10px;height:10px;padding:0}.dot.active{background:var(--primary);transform:scale(1.3)}.dot.correct{background:var(--success)}.dot.wrong{background:var(--danger)}.stats-overview{grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:24px;display:grid}.stat-card{background:var(--surface);text-align:center;box-shadow:var(--shadow);border-radius:12px;padding:16px 10px}.stat-value{color:var(--primary);font-size:24px;font-weight:700;display:block}.stat-label{color:var(--text-secondary);margin-top:4px;font-size:12px}.stats-chapters{flex-direction:column;gap:12px;display:flex}.stats-row{background:var(--surface);box-shadow:var(--shadow);border-radius:12px;padding:14px}.stats-row-top{justify-content:space-between;margin-bottom:8px;font-size:14px;font-weight:600;display:flex}.bar-track{background:#f3f4f6;border-radius:3px;height:6px;overflow:hidden}.bar-fill{background:var(--primary);border-radius:3px;height:100%;transition:width .3s}.stats-row-sub{color:var(--text-secondary);margin-top:6px;font-size:12px;display:block}@media (width>=640px){.page{padding:24px}.hero h1{font-size:32px}}