:root{--bd-bg: #FAF6F1;--bd-paper: #FFFCF7;--bd-ink: #1F2330;--bd-muted: #6B7280;--bd-line: #E5DFD4;--bd-good: #0F766E;--bd-bad: #B91C1C;--bd-warn: #D97706}*{box-sizing:border-box}body.battle-v2{margin:0;background:var(--bd-bg);color:var(--bd-ink);font-family:system-ui,-apple-system,Inter,PingFang SC,Microsoft YaHei,sans-serif;min-height:100vh}.bd-top{display:flex;justify-content:space-between;align-items:center;padding:14px 24px;border-bottom:1px solid var(--bd-line);background:var(--bd-paper)}.bd-back{color:var(--bd-ink);text-decoration:none;font-size:.95rem;font-weight:500}.bd-back:hover{text-decoration:underline}.bd-meta{display:flex;gap:14px;font-size:.85rem;color:var(--bd-muted)}.bd-meta .bd-room{font-weight:600;color:var(--bd-ink)}.bd-meta .bd-code{font-family:ui-monospace,monospace;letter-spacing:.08em}.bd-shell{max-width:640px;margin:32px auto;padding:0 20px}.bd-card{background:var(--bd-paper);border-radius:16px;padding:28px 24px;box-shadow:0 4px 16px #0000000a}.bd-center{text-align:center}.bd-card[hidden]{display:none}.bd-spinner{width:32px;height:32px;border:3px solid var(--bd-line);border-top-color:var(--bd-good);border-radius:50%;margin:0 auto 16px;animation:bd-spin .8s linear infinite}@keyframes bd-spin{to{transform:rotate(360deg)}}.bd-hint{color:var(--bd-muted);margin:0}.bd-qhead{display:flex;justify-content:space-between;font-size:.85rem;color:var(--bd-muted);margin-bottom:12px;font-weight:500}.bd-progress{color:var(--bd-ink)}.bd-timer{font-family:ui-monospace,monospace;font-weight:600;font-size:1rem;color:var(--bd-warn)}.bd-question{font-size:1.2rem;font-weight:600;line-height:1.5;margin:0 0 20px}.bd-options{display:grid;gap:10px}.bd-opt{width:100%;text-align:left;padding:14px 18px;border-radius:12px;border:1.5px solid var(--bd-line);background:#fff;color:var(--bd-ink);font-size:1rem;font-family:inherit;cursor:pointer;transition:background .15s,border-color .15s}.bd-opt:hover:not([disabled]){background:#f5f2eb;border-color:var(--bd-good)}.bd-opt[disabled]{cursor:default;opacity:.7}.bd-feedback{margin-top:16px;min-height:1.5em;font-weight:700;color:var(--bd-good);text-align:center}.bd-result-title{font-size:1.6rem;font-weight:700;margin:0 0 16px}.bd-result-score{font-size:2.4rem;font-weight:700;margin:0 0 12px;color:var(--bd-good)}.bd-result-detail{color:var(--bd-muted);margin:0 0 24px;line-height:1.5}.bd-result-acts{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.bd-btn-prim{display:inline-block;padding:12px 28px;background:var(--bd-good);color:#fff;border-radius:12px;text-decoration:none;font-weight:600;transition:background .15s;border:0;cursor:pointer;font-family:inherit;font-size:inherit;line-height:inherit}.bd-btn-prim:hover{background:#115e59}.bd-btn-ghost{display:inline-block;padding:12px 28px;background:transparent;color:inherit;border:1px solid currentColor;border-radius:12px;text-decoration:none;font-weight:600;opacity:.75;transition:opacity .15s}.bd-btn-ghost:hover{opacity:1}@media (max-width: 640px){.bd-shell{margin:16px auto;padding:0 12px}.bd-card{padding:20px 16px;border-radius:12px}.bd-question{font-size:1.05rem}.bd-result-score{font-size:2rem}}