:root{--bg:#050505;--ink:#f7f7f7;--muted:#9d9d9d;--line:rgba(255,255,255,.15);--cyan:#1ad9ef;--blue:#7e8bff;--pink:#f59bd9;--orange:#ff9e6a;--radius:18px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:"Microsoft YaHei UI","PingFang SC","Noto Sans SC",sans-serif;font-size:16px;line-height:1.55}a,button{font:inherit}a{color:inherit;text-decoration:none}button{cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid var(--cyan);outline-offset:4px}.page{min-height:100vh;overflow:hidden}.container{width:min(1180px,calc(100% - 48px));margin:0 auto}.topnav{height:74px;display:flex;align-items:center;gap:28px;border-bottom:1px solid var(--line)}.logo{display:flex;align-items:center;gap:10px;font-size:23px;font-weight:800;letter-spacing:-1px;white-space:nowrap}.logo-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:8px;background:#f7f7f7;color:#060606;font:bold 27px/1 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.product-hero{text-align:left;padding-bottom:55px}.product-hero h1{max-width:900px;margin-left:0}.product-hero p{margin-left:0}.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:46px}.product-card{min-height:420px;border:1px solid var(--line);border-radius:20px;padding:25px;display:flex;flex-direction:column;position:relative;overflow:hidden;background:#0b0b0b}.product-card:before{content:"";position:absolute;width:240px;height:240px;border-radius:50%;right:-80px;top:40px;filter:blur(2px);opacity:.8}.product-card-cyan:before{background:radial-gradient(circle,#23d8ef,transparent 68%)}.product-card-purple:before{background:radial-gradient(circle,#a982ff,transparent 68%)}.product-card-orange:before{background:radial-gradient(circle,#ff9d70,transparent 68%)}.product-card>*{position:relative;z-index:1}.product-card h2{font-size:30px;line-height:1.15;letter-spacing:-1px;margin:18px 0 10px;max-width:260px}.product-card p{color:var(--muted);max-width:260px;line-height:1.8;margin:0}.product-card ul{list-style:none;padding:0;margin:26px 0 28px;display:grid;gap:10px;color:#d3d3d3;font-size:14px}.product-card li:before{content:"✓";color:var(--cyan);margin-right:9px;font-weight:800}.product-card .product-action{margin-top:auto;display:inline-flex;align-items:center;justify-content:center;width:max-content}.product-card .product-label{font-size:12px;color:#bdbdbd;border:1px solid var(--line);border-radius:999px;padding:6px 10px;width:max-content}.product-card.featured{background:linear-gradient(150deg,#141d35,#0a0a0a)}.product-card.featured .product-label{color:#0b2022;background:#86f1d3;border-color:#86f1d3}.product-note{margin-top:18px;color:#858585;font-size:13px}.checkout-page{background:radial-gradient(circle at 80% 10%,rgba(126,139,255,.14),transparent 24%),var(--bg)}.checkout-shell{padding:74px 0 90px}.checkout-head{max-width:700px}.checkout-head h1{font-size:clamp(42px,6vw,68px);line-height:1.05;letter-spacing:-3px;margin:18px 0}.checkout-head p{color:var(--muted);font-size:17px;line-height:1.8;margin:0}.checkout-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;margin-top:46px}.checkout-card{border:1px solid var(--line);border-radius:20px;background:#0a0a0a;padding:25px}.checkout-card h2{font-size:22px;margin:0 0 19px}.product-picker{display:grid;gap:11px}.product-option{width:100%;border:1px solid var(--line);border-radius:14px;background:#0e0e0e;color:var(--ink);padding:18px;text-align:left;display:flex;align-items:center;justify-content:space-between;gap:20px}.product-option:hover{border-color:rgba(255,255,255,.4)}.product-option.selected{border-color:var(--cyan);box-shadow:0 0 0 1px rgba(26,217,239,.3),0 10px 32px rgba(26,217,239,.08)}.product-option strong{display:block;font-size:16px}.product-option span{display:block;color:var(--muted);font-size:13px;margin-top:4px}.option-mark{width:20px;height:20px;border:1px solid #666;border-radius:50%;display:grid;place-items:center;flex:0 0 auto}.product-option.selected .option-mark{border-color:var(--cyan);background:var(--cyan)}.product-option.selected .option-mark:after{content:"";width:7px;height:7px;border-radius:50%;background:#042126}.summary{display:grid;gap:14px;margin:22px 0 28px}.summary-row{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;border-bottom:1px solid var(--line);padding-bottom:13px}.summary-row span{color:var(--muted);font-size:13px}.summary-row strong{text-align:right;font-size:14px;max-width:220px}.payment-methods{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}.method{border:1px solid var(--line);border-radius:12px;background:#111;color:#c7c7c7;padding:12px}.method.selected{border-color:var(--cyan);color:var(--ink);background:rgba(26,217,239,.12)}.pay-button{width:100%;padding:14px 18px;font-size:16px}.pay-note{color:#7d7d7d;font-size:12px;line-height:1.7;margin:14px 0 0}.checkout-links{display:flex;gap:16px;flex-wrap:wrap;margin-top:24px;color:#a7a7a7;font-size:13px}.checkout-links a:hover{color:var(--cyan)}@media(max-width:900px){.product-grid{grid-template-columns:1fr 1fr}.checkout-grid{grid-template-columns:1fr}}@media(max-width:620px){.product-grid{grid-template-columns:1fr}.product-card{min-height:360px}.product-hero h1{font-size:45px}.checkout-shell{padding-top:52px}.checkout-card{padding:20px}.checkout-head h1{font-size:45px}}

.product-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
@media(max-width:1100px){.product-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:620px){.product-grid{grid-template-columns:1fr}}