:root{--bg:#F3F6FB;--surface:#fff;--soft:#E6EEF6;--title:#0B1F3A;--text:#1C3348;--muted:#4A6276;--hint:#7A8FA0;--deep:#0B3A6E;--blue:#1E6FBF;--cyan:#1396B3;--amber:#D97706;--coral:#E25B4C;--border:rgba(11,58,110,.16);--shadow:0 14px 34px rgba(7,20,40,.08);--footer:#071428;--max:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.75;overflow-x:hidden}a{color:inherit;text-decoration:none}button{font:inherit}img{display:block;max-width:100%;height:auto}.shell{width:min(var(--max),calc(100% - 32px));margin:auto}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;left:16px;top:-60px;z-index:1000;background:#fff;color:var(--deep);padding:10px 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