:root{--bg:#f1f4f5;--paper:#fff;--ink:#101719;--muted:#667276;--line:#d8e0e2;--soft:#e9eef0;--accent:#2a6f73;--accent2:#d9f0e7;--hot:#d9684f;--radius:22px;--shadow:0 18px 50px rgba(21,38,43,.08);--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.55}button,input,select{font:inherit}button{cursor:pointer}.shell{width:min(1180px,calc(100% - 36px));margin:auto}.site-header{position:sticky;top:0;z-index:50;background:rgba(241,244,245,.9);backdrop-filter:blur(16px);border-bottom:1px solid rgba(216,224,226,.8)}.header-row{height:76px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;text-decoration:none;letter-spacing:-.02em}.brand-mark{width:36px;height:36px;border:1px solid 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