:root{--bg: #f0f2f8;--surface: #fff;--ink: #1e2433;--soft: #5a6577;--line: #e4e8f2;--brand: #4f46e5;--brand-d: #4338ca;--brand-light: #eef2ff;--correct: #16a34a;--correct-bg: #f0fdf4;--wrong: #dc2626;--wrong-bg: #fef2f2;--radius: 14px;--shadow: 0 4px 18px rgba(31,39,51,.08);--sidebar-w: 230px;font-family:-apple-system,PingFang TC,Microsoft JhengHei,Noto Sans TC,Segoe UI,sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--ink);line-height:1.65}.app{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-w);flex-shrink:0;background:linear-gradient(160deg,#1e1b4b,#312e81);color:#c7d2fe;padding:28px 16px 40px;position:sticky;top:0;height:100vh;overflow-y:auto}.main{flex:1;overflow:hidden}.content{max-width:900px;margin:0 auto;padding:32px 24px 60px}.brand{display:flex;align-items:center;gap:10px;margin-bottom:4px}.logo{font-size:28px}.brand h1{font-size:15px;font-weight:700;color:#e0e7ff;line-height:1.4}.sub{font-size:11.5px;color:#818cf8;margin-bottom:26px;padding-left:38px}.nav-group-title{font-size:10.5px;font-weight:700;letter-spacing:.08em;color:#6366f1;text-transform:uppercase;margin:20px 0 8px 8px}.nav-link{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:10px;color:#c7d2fe;text-decoration:none;font-size:14px;font-weight:500;transition:background .15s}.nav-link:hover{background:#ffffff14}.nav-link.active{background:#ffffff26;color:#fff}.ico{font-size:16px;width:20px;text-align:center}.sidebar-note{font-size:11.5px;color:#818cf8;padding:0 8px;line-height:1.6}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 24px;margin-bottom:20px}.card-title{font-size:16px;font-weight:700;margin-bottom:14px;display:flex;align-items:center;gap:8px}.btn{background:var(--brand);color:#fff;border:none;border-radius:10px;padding:10px 20px;font-size:14.5px;font-weight:600;cursor:pointer;transition:background .15s}.btn:hover{background:var(--brand-d)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--brand);border:1.5px solid var(--brand);border-radius:10px;padding:9px 18px;font-size:14px;font-weight:600;cursor:pointer}.btn-ghost:hover{background:var(--brand-light)}.tag{display:inline-block;background:var(--brand-light);color:var(--brand-d);font-size:11.5px;font-weight:700;padding:2px 9px;border-radius:999px}.home-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:20px}.stat-card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px;text-align:center}.stat-card .num{font-size:28px;font-weight:700;color:var(--brand)}.stat-card .lbl{font-size:13px;color:var(--soft);margin-top:2px}.exam-info dt{color:var(--soft);font-size:13px;margin-top:10px}.exam-info dd{font-size:14px;font-weight:500;padding-left:0}.subject-row{display:flex;gap:8px;align-items:center;padding:10px 0;border-bottom:1px solid var(--line)}.subject-row:last-child{border-bottom:none}.subject-num{width:28px;height:28px;border-radius:50%;background:var(--brand);color:#fff;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}.subject-info .name{font-weight:600;font-size:14.5px}.subject-info .desc{font-size:13px;color:var(--soft);margin-top:2px}.tip-list{list-style:none}.tip-list li{padding:7px 0;border-bottom:1px solid var(--line);font-size:14px;display:flex;gap:8px}.tip-list li:last-child{border-bottom:none}.nav-link-btn{width:100%;border:none;cursor:pointer;text-align:left;background:transparent;font-size:14px;font-weight:500;display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:10px;color:#c7d2fe;transition:background .15s}.nav-link-btn:hover{background:#ffffff14}.nav-link-btn.active{background:#ffffff26;color:#fff}.chevron{font-size:11px;opacity:.7}.nav-sub{padding-left:8px;margin-bottom:4px}.nav-sub-group{font-size:10px;font-weight:700;letter-spacing:.06em;color:#6366f1;text-transform:uppercase;padding:6px 10px 2px}.nav-sub-link{display:block;padding:6px 10px;border-radius:8px;color:#a5b4fc;text-decoration:none;font-size:12.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:background .12s}.nav-sub-link:hover{background:#ffffff12;color:#e0e7ff}.nav-sub-link.active{background:#ffffff21;color:#fff;font-weight:600}.kw-hl{color:#b91c1c;font-weight:600}.exam-badge{display:inline-flex;align-items:center;background:#fef3c7;color:#92400e;font-size:11px;font-weight:600;padding:1px 7px;border-radius:999px;margin-left:8px;cursor:default;border:1px solid #fde68a;vertical-align:middle}.q-ref{display:inline-flex;align-items:center;background:#fff7ed;color:#c2410c;font-size:10px;font-weight:700;padding:1px 6px;border-radius:4px;margin-left:5px;border:1px solid #fed7aa;cursor:help;white-space:nowrap;vertical-align:middle;line-height:1.5}.q-ref:hover{background:#ffedd5}.notes-layout{display:flex;gap:20px;align-items:flex-start}.notes-nav{width:190px;flex-shrink:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;position:sticky;top:20px}.notes-nav-item{display:block;padding:10px 14px;font-size:13.5px;cursor:pointer;border-bottom:1px solid var(--line);color:var(--ink);background:none;border-left:none;border-right:none;border-top:none;width:100%;text-align:left;transition:background .12s}.notes-nav-item:last-child{border-bottom:none}.notes-nav-item:hover{background:var(--bg)}.notes-nav-item.active{background:var(--brand-light);color:var(--brand-d);font-weight:600}.notes-nav-group{font-size:10.5px;font-weight:700;color:var(--soft);letter-spacing:.06em;padding:8px 14px 4px;text-transform:uppercase}.notes-content{flex:1;min-width:0}.md-body{font-size:14.5px;line-height:1.8}.md-body h1{font-size:20px;font-weight:700;margin:0 0 16px;color:var(--brand-d)}.md-body h2{font-size:17px;font-weight:700;margin:24px 0 10px;border-bottom:2px solid var(--brand-light);padding-bottom:6px}.md-body h3{font-size:15px;font-weight:700;margin:18px 0 8px}.md-body h4{font-size:14px;font-weight:700;margin:14px 0 6px;color:var(--soft)}.md-body p{margin:8px 0}.md-body ul,.md-body ol{padding-left:22px;margin:8px 0}.md-body li{margin:4px 0}.md-body table{width:100%;border-collapse:collapse;margin:12px 0;font-size:13.5px}.md-body th{background:var(--brand-light);color:var(--brand-d);padding:8px 12px;text-align:left;border:1px solid var(--line)}.md-body td{padding:7px 12px;border:1px solid var(--line)}.md-body tr:nth-child(2n) td{background:#fafbff}.md-body code{background:#f1f5f9;border-radius:4px;padding:1px 6px;font-size:13px;font-family:monospace}.md-body pre{background:#1e2433;color:#e2e8f0;border-radius:10px;padding:16px;overflow-x:auto;margin:12px 0}.md-body pre code{background:none;color:inherit;padding:0}.md-body blockquote{border-left:3px solid var(--brand);background:var(--brand-light);padding:10px 16px;border-radius:0 8px 8px 0;margin:10px 0}.md-body hr{border:none;border-top:1px solid var(--line);margin:20px 0}.md-body strong{color:#b91c1c}.quiz-filter{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:6px}.quiz-filter label{font-size:13.5px;font-weight:600;color:var(--soft)}.quiz-filter select{padding:7px 10px;border:1px solid var(--line);border-radius:8px;font-size:14px;background:var(--surface);color:var(--ink);cursor:pointer}.quiz-meta{font-size:12px;color:var(--soft);display:flex;gap:12px;margin-bottom:14px;flex-wrap:wrap}.quiz-meta span{background:var(--bg);border-radius:6px;padding:2px 8px}.progress-bar-wrap{background:var(--line);border-radius:999px;height:6px;margin-bottom:20px}.progress-bar{background:var(--brand);border-radius:999px;height:6px;transition:width .3s}.stem{font-size:15.5px;line-height:1.75;font-weight:500;margin-bottom:20px}.options{display:flex;flex-direction:column;gap:10px}.opt-btn{display:flex;align-items:flex-start;gap:12px;padding:13px 16px;border:1.5px solid var(--line);border-radius:10px;background:var(--surface);cursor:pointer;font-size:14.5px;text-align:left;transition:border-color .15s,background .15s;line-height:1.6}.opt-btn:hover:not(:disabled){border-color:var(--brand);background:var(--brand-light)}.opt-btn:disabled{cursor:default}.opt-btn.correct{border-color:var(--correct);background:var(--correct-bg)}.opt-btn.wrong{border-color:var(--wrong);background:var(--wrong-bg)}.opt-label{font-weight:700;color:var(--brand-d);flex-shrink:0;width:22px}.opt-btn.correct .opt-label{color:var(--correct)}.opt-btn.wrong .opt-label{color:var(--wrong)}.quiz-nav{display:flex;align-items:center;justify-content:space-between;margin-top:20px}.quiz-counter{font-size:13px;color:var(--soft)}.summary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:20px 0}.summary-item{text-align:center}.summary-item .big{font-size:30px;font-weight:700}.summary-item .lbl{font-size:13px;color:var(--soft)}.s-correct{color:var(--correct)}.s-wrong{color:var(--wrong)}.s-total{color:var(--brand-d)}@media (max-width: 680px){.sidebar{display:none}.home-grid{grid-template-columns:1fr}.notes-layout{flex-direction:column}.notes-nav{width:100%;position:static}.summary-grid{grid-template-columns:1fr 1fr}}