:root{--primary: #E60012;--primary-bg: #FFF1F2;--primary-dark: #C7000F;--primary-border: #FFD7DC;--text: #18181B;--text-muted: #71717A;--page-bg: #FAFAFA;--card: #FFFFFF;--border: #E4E4E7;--shadow: 0 4px 24px rgba(24, 24, 27, .06);--shadow-hover: 0 12px 40px rgba(230, 0, 18, .08);--radius: 12px;--header-h: 80px;--logo-w: 240px;--logo-h: 56px;--max: 1200px;--section-y: 40px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;overflow-x:hidden}body{font-family:Noto Sans SC,Source Han Sans SC,PingFang SC,Hiragino Sans GB,sans-serif;color:var(--text);background:var(--page-bg);line-height:1.55;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}button{font:inherit;cursor:pointer;border:none;background:none}.container{width:min(100% - 48px,var(--max));margin:0 auto}.site-header{position:sticky;top:0;z-index:200;background:#fffffff5;backdrop-filter:blur(12px);border-bottom:1px solid 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