:root{--brand: #15b8a6;--ink: #17212b;--muted: #697887;--line: #e5edf1;--soft: #f4f8f9;--bg: #f6f8fb;--accent: #ff5f46;--success: #16a34a;--fs-caption: 12px;--fs-body-sm: 13px;--fs-body: 14px;--fs-body-lg: 15px;--fs-title-sm: 16px;--fs-title-md: 20px;--fs-title-lg: 24px;--fs-display: 30px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,Microsoft YaHei,Noto Sans SC,sans-serif;font-size:var(--fs-body);line-height:1.5}a{color:inherit;text-decoration:none}button,input{font:inherit}img{max-width:100%}.site-header{position:sticky;top:0;z-index:30;border-bottom:1px solid var(--line);background:#fffffff5;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;width:min(960px,calc(100vw - 32px));height:68px;margin:0 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