:root{--canvas: #f7f5ef;--sidebar: #f3f0e8;--surface: #fffdf9;--soft: #f1efe9;--ink: #242321;--muted: #706e68;--border: #e3dfd5;--primary: #292826;--accent: #5f84d6;--accent-soft: #e8eef9;--success: #33745a;--warm: #d97757;--radius: 12px;--radius-lg: 16px;--shadow: 0 18px 50px rgb(36 35 33 / 10%);--font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "微软雅黑", "PingFang SC", "Hiragino Sans GB", sans-serif}*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;overflow-x:hidden;background:var(--canvas);color:var(--ink);font-family:var(--font);line-height:1.55}button,a{font:inherit}img{display:block;max-width:100%}a{color:inherit}:focus-visible{outline:3px solid var(--accent);outline-offset:3px}.site-header{position:fixed;z-index:30;inset:0 0 auto;height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(20px,4vw,64px);border-bottom:1px solid rgb(227 223 213 / 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