:root{--bg: #f4f7fb;--bg-deep: #0b1f36;--surface: #ffffff;--text: #132033;--muted: #5b6b7c;--line: #d7e2ef;--brand: #0b5cab;--brand-2: #1479d8;--brand-soft: #e8f2ff;--accent: #1aa6a0;--danger: #c0392b;--radius: 18px;--shadow: 0 18px 50px rgba(11, 31, 54, .08);--font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;--font-display: "Outfit", "Noto Sans SC", sans-serif;--nav-h: 72px}*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--font-body);color:var(--text);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}button,input,select,textarea{font:inherit}#root{min-height:100vh}.site{min-height:100vh;display:flex;flex-direction:column}.site-main{flex:1}.container{width:min(1120px,calc(100% - 40px));margin:0 auto}.site-header{position:sticky;top:0;z-index:50;height:var(--nav-h);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#f4f7fbdb;border-bottom:1px solid rgba(215,226,239,.8)}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:700;font-size:1.25rem;letter-spacing:.02em;color:var(--bg-deep)}.brand-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(145deg,var(--brand),#083a6d);color:#fff;display:grid;place-items:center;font-size:.85rem;box-shadow:0 8px 20px #0b5cab47}.nav{display:flex;align-items:center;gap:4px;flex-wrap:wrap;justify-content:flex-end}.nav a{padding:8px 12px;border-radius:999px;color:var(--muted);font-size:.92rem;transition:color .2s,background .2s}.nav a:hover,.nav a.active{color:var(--brand);background:var(--brand-soft)}.nav-toggle{display:none;border:1px solid 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