:root{--bg:#F3FBFF;--surface:#fff;--soft:#F8FCFF;--line:#E2F4FD;--sky:#22AEEA;--deep:#147FB8;--text:#34465C;--muted:#5C6F82;--light:#8797A9;--shadow:0 16px 38px rgba(31,133,184,.12)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75}a{text-decoration:none;color:inherit}img{max-width:100%;display:block}.container{width:min(1180px,calc(100% - 32px));margin:auto}.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid rgba(34,174,234,.12)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:72px}.logo{flex:0 0 auto}.logo img{max-height:52px;width:auto}.nav-core{display:flex;align-items:center;gap:22px;white-space:nowrap;flex-wrap:nowrap}.nav-core a{color:var(--text);font-weight:700;position:relative;padding:8px 4px}.nav-core a:hover,.nav-core a.active{color:var(--sky)}.nav-core a.active:after{content:"";position:absolute;left:50%;bottom:-10px;width:22px;height:3px;border-radius:999px;background:var(--sky);transform:translateX(-50%)}.main-btn{display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#45C9F5 0%,#22AEEA 52%,#168ED4 100%);color:#fff;border-radius:999px;padding:11px 24px;font-weight:800;box-shadow:0 10px 24px rgba(34,174,234,.28)}.channel-bar{background:#fff;border-top:1px solid rgba(34,174,234,.08);overflow-x:auto;white-space:nowrap}.channel-inner{display:flex;gap:4px;padding:8px 0}.channel-bar a{display:inline-flex;align-items:center;color:var(--muted);padding:7px 12px;border-radius:999px;font-size:14px}.channel-bar a:hover{color:var(--sky);background:rgba(34,174,234,.1)}.menu-toggle{display:none;border:0;background:transparent;padding:7px}.menu-toggle 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