:root{--bg:#F4FAFC;--deep:#FFFFFF;--sub:#E7F3F6;--title:#0E3A46;--text:#24505A;--muted:#4A7380;--aux:#7A9AA4;--brand:#1A7F8F;--bright:#2BB3C4;--dark:#0F5B68;--pale:#D7EEF2;--line:rgba(26,127,143,.16);--shadow:0 14px 34px rgba(14,58,70,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden;padding-top:124px}a{color:var(--dark);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid rgba(43,179,196,.42);outline-offset:3px}.shell{width:min(1180px,calc(100% - 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