:root{--bg: #f5f7fb;--card: #ffffff;--text: #1f2a37;--muted: #6b7280;--primary: #2563eb;--border: #e5e7eb}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Noto Sans CJK SC,sans-serif;color:var(--text);background:var(--bg)}a{color:inherit;text-decoration:none}.btn{appearance:none;border:1px solid transparent;border-radius:10px;padding:12px 14px;font-size:14px;line-height:1;cursor:pointer}.btn-primary{background:var(--primary);color:#fff}.btn-secondary{background:#fff;color:var(--text);border-color:var(--border)}.btn:disabled{opacity:.6;cursor:not-allowed}.input{width:100%;border:1px solid var(--border);border-radius:10px;padding:12px;font-size:14px;outline:none;background:#fff}.input:focus{border-color:#2563eb99;box-shadow:0 0 0 3px #2563eb26}.label{font-size:13px;color:var(--muted);margin-bottom:6px}.page{min-height:100vh;display:flex;flex-direction:column}.topbar{min-height:180px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;padding:12px 16px;border-bottom:1px solid rgba(229,231,235,.6);background:#ffffffbf;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.brand{display:flex;align-items:center}.brand img{height:336px;max-height:42vw;width:auto;display:block}.topbar-title{display:none}.topbar-right{font-size:12px;color:var(--muted)}.container{flex:1;display:grid;place-items:center;padding:22px 14px}.page-title{width:100%;max-width:420px;text-align:center;font-size:28px;font-weight:800;line-height:1.2;margin:6px 0 14px}.card{width:100%;max-width:420px;background:var(--card);border:1px solid rgba(229,231,235,.9);border-radius:16px;box-shadow:0 10px 30px #1f2a3714;padding:18px}.card-title{font-size:18px;font-weight:700;margin:4px 0 14px}.form-row{margin-bottom:14px}.code-row{display:grid;grid-template-columns:1fr auto;gap:10px}.helper{font-size:12px;color:var(--muted);margin-top:8px}.footer{padding:14px 16px;text-align:center;color:var(--muted);font-size:12px}@media(min-width:768px){.topbar{min-height:120px;padding:12px 24px}.brand img{height:180px;max-height:120px}.page-title{font-size:32px;margin:8px 0 16px}.container{padding:30px 16px}}