:root{--brand:rgb(255,80,0);--brand-dark:#E85A00;--light-orange:#FFF3EC;--page:#F6F6F6;--text:#222;--muted:#555;--soft:#777;--footer:#1F1F1F;--card:#fff;--line:#eee;--shadow:0 12px 32px rgba(0,0,0,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;background:var(--page);color:var(--text);line-height:1.75;overflow-x:hidden}img{max-width:100%;height:auto;display:block}a{color:inherit;text-decoration:none}.container{width:min(1180px,92vw);margin:0 auto}.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid rgba(0,0,0,.06);box-shadow:0 6px 18px rgba(0,0,0,.04);backdrop-filter:blur(12px)}.mobile-topbar{height:64px;display:grid;grid-template-columns:76px 1fr 92px;align-items:center;padding:0 12px;gap:8px}.menu-toggle{width:42px;height:42px;border:0;background:transparent;display:flex;flex-direction:column;justify-content:center;gap:5px;padding:0 8px}.menu-toggle span{height:2px;background:#222;border-radius:999px}.mobile-logo{justify-self:center;display:flex;align-items:center;justify-content:center}.mobile-logo img{max-height:38px;max-width:142px;object-fit:contain}.main-btn{display:inline-flex;align-items:center;justify-content:center;background:var(--brand);color:#fff!important;border-radius:999px;padding:12px 24px;font-weight:800;letter-spacing:.02em;box-shadow:0 10px 22px rgba(255,80,0,.28);transition:.2s ease}.main-btn:hover{background:var(--brand-dark);transform:translateY(-1px)}.header-btn{padding:9px 18px;font-size:14px;white-space:nowrap}.mobile-register{justify-self:end;padding:8px 12px;font-size:13px}.desktop-header{display:none;height:76px;align-items:center;gap:24px}.brand 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