:root{--brand-1: #4f46e5;--brand-2: #7c3aed;--brand-grad: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);--bg: #f4f5fb;--card: #ffffff;--ink: #17172b;--ink-2: #55556e;--ink-3: #8a8aa3;--line: #e6e7f0;--ok: #059669;--ok-bg: #ecfdf5;--bad: #dc2626;--bad-bg: #fef2f2;--radius: 16px;--shadow: 0 1px 2px rgba(23, 23, 43, .05), 0 8px 24px rgba(23, 23, 43, .06);--shadow-lg: 0 12px 40px rgba(79, 70, 229, .18)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Segoe UI,sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}button{font-family:inherit}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;cursor:pointer;border-radius:12px;font-size:14px;font-weight:600;padding:10px 18px;transition:transform .12s ease,box-shadow .12s ease,opacity 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scale(1)}}.q-index{font-size:12.5px;font-weight:800;color:var(--brand-1);letter-spacing:1px;margin-bottom:8px}.q-index .q-of{color:var(--ink-3);font-weight:700}.q-text{font-size:15.5px;line-height:1.85;white-space:pre-wrap;margin-bottom:18px;font-weight:500}.quiz-bottom-nav{display:flex;align-items:center;gap:14px;justify-content:space-between;padding:12px 4px}.q-dots{display:flex;flex-wrap:wrap;gap:7px;justify-content:center;flex:1}.q-dot{width:10px;height:10px;border-radius:50%;background:#dcdff0;cursor:pointer;transition:transform .15s,background .15s}.q-dot:hover{transform:scale(1.3)}.q-dot.done{background:var(--brand-1)}.q-dot.ok{background:var(--ok)}.q-dot.no{background:var(--bad)}.q-dot.now{outline:2px solid rgba(79,70,229,.35);outline-offset:2px;transform:scale(1.25)}.opt-check{color:var(--brand-1);font-weight:800}.q-verdict-tag{margin-left:8px;font-size:12px;padding:2px 10px;border-radius:999px;letter-spacing:0}.q-verdict-tag.ok{background:var(--ok-bg);color:var(--ok)}.q-verdict-tag.no{background:var(--bad-bg);color:var(--bad)}.explain-anim{animation:explainIn .35s ease .05s both}@keyframes explainIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.opt{display:flex;align-items:flex-start;gap:12px;padding:13px 16px;margin-bottom:10px;border:1.5px solid var(--line);border-radius:13px;cursor:pointer;transition:border-color .15s,background .15s,transform .1s;background:#fbfbfe}.opt:hover{border-color:#c7c9ee;background:#f5f6fe}.opt.selected{border-color:var(--brand-1);background:#eef0fe;box-shadow:0 0 0 3px #4f46e51a}.opt-letter{width:26px;height:26px;border-radius:8px;background:#eceef8;color:var(--ink-2);display:grid;place-items:center;font-size:13px;font-weight:800;flex-shrink:0}.opt.selected 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22px;border-radius:12px;font-size:13.5px;font-weight:600;z-index:200;box-shadow:0 10px 30px #0000004d;animation:fadeIn .2s ease}.spinner{display:inline-block;width:16px;height:16px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}