:root{--bg: #f5f5f7;--surface: #ffffff;--ink: #1d1d1f;--muted: #6e6e73;--faint: #9c9686;--border: #e2e0da;--border-strong: #cfccc4;--hover: #f3f2ee;--accent: #1d1d1f;--focus: #0071e3;--focus-ring: rgba(0, 113, 227, .18);--danger: #c0392b;--danger-bg: #fdf1ef;--chip-on: #f0eee6;--radius: 10px}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--ink)}h1{font-size:26px;letter-spacing:-.01em}h3{margin:0 0 12px;font-size:17px}.center{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:16px}.container{max-width:1000px;margin:0 auto;padding:24px}.muted{color:var(--muted)}.hint{font-size:12px;color:var(--faint);margin:8px 0 0}.intro{font-size:13.5px;color:var(--muted);margin:0 0 16px;line-height:1.55}.error{color:var(--danger);font-size:13.5px}.card{background:var(--surface);border-radius:12px;padding:18px;margin-bottom:16px;box-shadow:0 1px 3px 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