:root{--bg:#f5f6f8;--card:#fff;--text:#1a1a1a;--muted:#767880;--primary:#2c5cff;--primary-pressed:#1f43c2;--border:#e5e7eb;--error:#d33b3b;--success:#1f8c4d}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Segoe UI,Roboto,sans-serif;font-size:15px;line-height:1.5}.page{min-height:100vh;padding:24px 16px}.container{max-width:480px;margin:0 auto}.card{background:var(--card);border-radius:12px;border:1px solid var(--border);padding:20px;margin-bottom:16px}h1{font-size:20px;margin:0 0 8px}h2{font-size:16px;margin:0 0 12px}.muted{color:var(--muted);font-size:13px}.slot-list{list-style:none;padding:0;margin:0}.slot{display:flex;justify-content:space-between;align-items:center;padding:14px 12px;border:1px solid var(--border);border-radius:8px;margin-bottom:10px}.slot.selected{border-color:var(--primary);background:rgba(44,92,255,.06)}.slot-label{font-weight:500}.btn{display:block;width:100%;padding:12px 16px;border:0;border-radius:8px;background:var(--primary);color:#fff;font-size:16px;font-weight:600;cursor:pointer}.btn:disabled{opacity:.6;cursor:not-allowed}.btn:hover:not(:disabled){background:var(--primary-pressed)}.error{color:var(--error);font-size:14px;margin-top:8px}.ok{color:var(--success)}