:root{--bg: #f4f6f9;--card: #ffffff;--text: #1c2430;--muted: #5b6472;--border: #d8dde5;--accent: #1d4ed8;--accent-dark: #173db0;--warn: #b45309;--warn-bg: #fffbeb;--ok: #15803d;--ok-bg: #f0fdf4}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Segoe UI,system-ui,-apple-system,sans-serif;font-size:16px;line-height:1.5}main{max-width:860px;margin:0 auto;padding:28px 16px 80px}header h1{margin:0;font-size:1.75rem}header p{margin:4px 0 0;color:var(--muted);max-width:56ch}h2{margin:0 0 4px;font-size:1.15rem}h3{margin:0;font-size:1rem}.card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:20px 24px;margin-top:16px}.card>p:first-of-type{margin-top:4px}.hint{color:var(--muted);font-size:.9rem;max-width:62ch}.stepper{display:flex;gap:8px;list-style:none;margin:24px 0 0;padding:0}.step{flex:1;display:flex;align-items:center;gap:8px;padding:10px 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var(--line);padding-left:8px}.demo-row-recheck{margin:6px 0 0;font-size:11.5px;font-weight:600;color:var(--amber)}.demo-confirm{margin-top:9px;padding:5px 12px;font:inherit;font-size:12px;font-weight:600;border-radius:6px;border:1px solid var(--amber);background:transparent;color:var(--amber);cursor:pointer}.demo-confirm:hover{background:#e8b04b1f}.demo-browser-head{display:flex;align-items:center;gap:6px;padding:11px 14px;border-bottom:1px solid var(--line);background:var(--bg-raise)}.demo-form{padding:22px clamp(14px,3vw,28px) 26px}.demo-form h3{margin:0 0 20px;font-size:17px;letter-spacing:-.02em}.demo-field{display:grid;grid-template-columns:165px 1fr;align-items:center;gap:14px;padding:8px 0}@media (max-width: 560px){.demo-field{grid-template-columns:1fr;gap:4px}}.demo-field>span{font-size:12.5px;color:var(--ink-dim)}.demo-field output{min-height:34px;padding:7px 10px;border:1px solid var(--line);border-radius:6px;background:#0b1116;font-size:13.5px;color:var(--ink)}.demo-field 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