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*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--text);font-family:"Microsoft YaHei","PingFang SC",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:1000;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid rgba(201,0,0,.08)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:74px}.logo{flex:0 0 auto}.logo img{max-height:52px;width:auto}.nav-core{display:flex;align-items:center;justify-content:center;gap:10px;white-space:nowrap;flex-wrap:nowrap;flex:1}.nav-core a{color:var(--text);background:var(--soft);border-radius:999px;padding:10px 16px;font-weight:700}.nav-core a:hover,.nav-core a.active{color:var(--red);background:rgba(201,0,0,.08)}.main-btn{display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(180deg,#F12B2B 0%,#C90000 55%,#A80000 100%);color:#fff!important;border-radius:12px;padding:11px 22px;font-weight:800;box-shadow:0 8px 18px rgba(201,0,0,.22)}.header-register{flex:0 0 auto}.menu-toggle{display:none;border:0;background:#fff;padding:8px}.menu-toggle span{display:block;width:23px;height:2px;background:#1F2329;margin:5px;border-radius:2px}.page-shell{display:grid;grid-template-columns:190px minmax(0,1fr);gap:28px;align-items:start}.side-category{position:sticky;top:96px;margin-top:24px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:10px;max-height:calc(100vh - 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