:root{--bg:#050814;--panel:#0b1226;--card:#111a33;--line:rgba(143,170,255,.16);--text:#eef5ff;--muted:#91a0bd;--cyan:#54d8ff;--violet:#9b7cff;--green:#5effb6;--red:#ff6b7a;--shadow:0 30px 90px rgba(0,0,0,.45)}*{box-sizing:border-box}body{margin:0;font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:radial-gradient(circle at 80% -10%,rgba(84,216,255,.18),transparent 32%),radial-gradient(circle at 0 20%,rgba(155,124,255,.14),transparent 26%),var(--bg);color:var(--text);min-height:100vh}.noise{position:fixed;inset:0;pointer-events:none;opacity:.05;background-image:linear-gradient(90deg,#fff 1px,transparent 1px),linear-gradient(#fff 1px,transparent 1px);background-size:36px 36px}a{color:inherit;text-decoration:none}.topbar{position:sticky;top:0;z-index:10;display:flex;justify-content:space-between;gap:24px;align-items:center;padding:18px clamp(18px,4vw,54px);background:rgba(5,8,20,.7);backdrop-filter:blur(20px);border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center}.brand span{display:grid;place-items:center;width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,var(--cyan),var(--violet));color:#04111d;font-weight:900}.brand b{display:block;letter-spacing:.08em}.brand em{display:block;font-style:normal;color:var(--muted);font-size:12px}.topbar nav{display:flex;gap:8px;flex-wrap:wrap}.topbar nav a{font-size:14px;color:#c9d8f2;border:1px solid transparent;border-radius:999px;padding:9px 12px}.topbar nav a:hover{border-color:var(--line);background:rgba(255,255,255,.04)}.hero,.section,.checkout{width:min(1160px,calc(100% - 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