:root{--bg:#F4FAFC;--white:#fff;--soft:#E7F3F6;--ink:#0E3A46;--text:#24505A;--muted:#4A7380;--aux:#7A9AA4;--sea:#1A7F8F;--bright:#2BB3C4;--deep:#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}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.8;overflow-x:hidden}body.lock{overflow:hidden}a{color:inherit;text-decoration:none}img{width:100%;height:auto;max-width:100%;object-fit:contain;object-position:center;display:block}.wrap{width:min(1200px,calc(100% - 32px));margin:auto}.site-header{position:fixed;inset:0 0 auto;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.brand-bar{height:72px;width:min(1200px,calc(100% - 32px));margin:auto;display:grid;grid-template-columns:auto 1fr 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