:root{--bg: #f5f5f7;--surface: #ffffff;--text: #1d1d1f;--muted: #6e6e73;--hairline: #d2d2d7;--accent: #0071e3;--accent-hover: #0077ed;--grid: #ffffff;--border: #e8e8ed;--cell: #1d1d1f;--radius: 18px;--shadow: 0 1px 3px rgba(0, 0, 0, .04), 0 8px 28px rgba(0, 0, 0, .06);--font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;--mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace}*{box-sizing:border-box}html{-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.5}main{max-width:960px;margin:0 auto;padding:64px 24px 48px;display:flex;flex-direction:column;gap:28px}header{text-align:center}h1{margin:0;font-size:clamp(2.2rem,5vw,3rem);font-weight:600;letter-spacing:-.02em}.subtitle{margin:10px auto 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