:root{--red:#C90000;--red-dark:#A80000;--text:#1F2329;--muted:#5D6673;--soft:#8A93A0;--line:rgba(201,0,0,.12);--bg:#fff;--gray:#F6F7F9;--gray2:#F1F3F6;--shadow:0 12px 30px rgba(18,28,45,.08);--radius:18px}*{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{color:inherit;text-decoration:none}img{display:block;max-width:100%}.shell{width:min(1380px,calc(100% - 32px));margin:auto}.site-header{position:fixed;top:0;left:0;right: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;margin-left:auto}.nav-core a{color:var(--text);background:var(--gray);border-radius:999px;padding:10px 16px;font-weight:700;transition:.2s}.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;border-radius:999px;padding:11px 23px;font-weight:800;box-shadow:0 8px 18px rgba(201,0,0,.2)}.header-register{margin-left:6px;flex:0 0 auto}.menu-toggle{display:none;border:0;background:transparent;width:42px;height:42px;padding:9px}.menu-toggle span{display:block;height:2px;background:#1f2329;margin:6px 0;border-radius:2px}.site-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:28px;padding-top:98px}.side-category{position:sticky;top:96px;align-self:start;background:#fff;border:1px solid rgba(201,0,0,.10);border-radius:18px;box-shadow:var(--shadow);padding:12px;max-height:calc(100vh - 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