:root{--bg: #0f1220;--bg-soft: #171b2e;--card: #1e2338;--card-hover: #262c47;--border: #2e3654;--text: #e7eaf3;--text-dim: #9aa2c0;--primary: #6c8cff;--primary-dark: #4f6ef0;--accent: #34d399;--danger: #f87171;--warn: #fbbf24;--radius: 14px;--shadow: 0 10px 40px rgba(0, 0, 0, .35)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:radial-gradient(1200px 600px at 20% -10%,#26305a 0%,transparent 55%),radial-gradient(1000px 500px at 110% 10%,#2a1f4a 0%,transparent 50%),var(--bg);color:var(--text);min-height:100vh;line-height:1.6}.wrap{max-width:900px;margin:0 auto;padding:40px 20px 80px}.hidden{display:none!important}.app-header{text-align:center;margin-bottom:34px}.app-header h1{font-size:30px;font-weight:800;letter-spacing:.5px}.app-header .sub{color:var(--text-dim);margin-top:8px;font-size:15px}.badge{display:inline-block;background:#6c8cff26;color:var(--primary);border:1px solid 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26px;font-size:15px;font-weight:700;cursor:pointer;transition:.18s}.btn:hover{background:var(--primary-dark);transform:translateY(-1px)}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}.btn.block{width:100%}.btn.ghost{background:transparent;border:1px solid var(--border);color:var(--text)}.btn.ghost:hover{background:var(--card-hover)}.btn.accent{background:var(--accent)}.btn.accent:hover{background:#28b587}.footer-actions{margin-top:26px}.quiz-top{position:sticky;top:0;z-index:5;background:#0f1220d9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid var(--border);border-radius:12px;padding:14px 18px;margin-bottom:20px;display:flex;align-items:center;justify-content:space-between;gap:16px}.progress{flex:1;height:8px;background:var(--bg-soft);border-radius:999px;overflow:hidden}.progress>i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--primary),var(--accent));transition:.3s}.progress-text{font-size:13px;color:var(--text-dim);white-space:nowrap}.group-head{display:flex;align-items:center;gap:12px;margin:30px 0 14px}.group-head .ic{width:34px;height:34px;border-radius:9px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:12px;color:#0b0e18}.group-head h2{font-size:18px;font-weight:800}.group-head .cnt{color:var(--text-dim);font-size:13px}.group-intro{font-size:13px;color:var(--text-dim);background:var(--bg-soft);border:1px dashed var(--border);border-radius:10px;padding:10px 14px;margin-bottom:16px}.q-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px;margin-bottom:16px}.q-card .q-idx{color:var(--primary);font-weight:800;font-size:13px;margin-bottom:8px}.q-body{font-size:15px;margin-bottom:14px}.q-body p{margin-bottom:8px}textarea{width:100%;min-height:96px;resize:vertical;background:var(--bg-soft);color:var(--text);border:1px solid var(--border);border-radius:10px;padding:12px 14px;font-size:14px;font-family:SFMono-Regular,Consolas,Courier New,monospace;line-height:1.6}textarea:focus{outline:none;border-color:var(--primary)}pre{background:#0b0e18;border:1px solid var(--border);border-radius:8px;padding:12px 14px;overflow-x:auto;margin:8px 0}code{font-family:SFMono-Regular,Consolas,Courier New,monospace;font-size:13.5px}p code,li code{background:#6c8cff26;color:#a9bcff;padding:1px 6px;border-radius:5px}pre code{color:#d6def5}.score-hero{text-align:center;padding:10px 0 24px}.score-hero .big{font-size:46px;font-weight:900}.answer-box{margin-top:14px;border-top:1px dashed var(--border);padding-top:14px}.answer-box 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