:root{--ink:#18202a;--muted:#657080;--line:#e6e8ec;--paper:#fff;--bg:#f4f6f8;--red:#d92d20;--red-dark:#b42318;--green:#16a34a;--blue:#1677ff}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.65}.topbar{height:64px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100vw - 960px)/2));color:var(--muted);font-size:14px}.brand{font-size:18px;font-weight:800;color:var(--ink);text-decoration:none}.shell{max-width:960px;margin:36px auto;padding:0 20px}.hero{padding:30px 34px;background:linear-gradient(125deg,#a91414,#e33d2e);color:#fff;border-radius:20px;display:flex;justify-content:space-between;gap:20px;align-items:center;box-shadow:0 16px 38px rgba(153,27,27,.2)}.hero h1{font-size:34px;margin:3px 0}.hero p{margin:0;opacity:.9}.eyebrow{font-size:13px;font-weight:700;letter-spacing:.14em;text-transform:uppercase}.price{text-align:right}.price small{display:block;opacity:.85}.price b{font-size:52px;line-height:1.1}.price b span{font-size:24px;margin-right:4px}.card,.result-card{background:var(--paper);border:1px solid var(--line);border-radius:18px;margin-top:18px;padding:28px 32px}.card h2{font-size:19px;margin:0 0 14px}.product p{margin:8px 0;color:#495464}.channels{display:grid;grid-template-columns:1fr 1fr;gap:12px}.channel{border:1px solid var(--line);background:#fff;border-radius:14px;padding:16px;text-align:left;display:flex;align-items:center;gap:12px;font-size:16px;cursor:pointer}.channel.active{border-color:var(--red);box-shadow:0 0 0 2px rgba(217,45,32,.1)}.channel small{display:block;color:var(--muted);font-size:13px}.pay-icon{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;color:white;font-weight:800}.wechat{background:#17b75b}.alipay{background:var(--blue)}.consent{display:block;margin:20px 0 14px;font-size:14px;color:#475467}.consent input{width:17px;height:17px;vertical-align:-3px}.primary{width:100%;border:0;border-radius:12px;background:var(--red);color:#fff;padding:14px 20px;font-size:17px;font-weight:750;cursor:pointer}.primary:hover{background:var(--red-dark)}.primary:disabled{opacity:.6}.hint{text-align:center;color:var(--muted);font-size:13px}.qr-panel{text-align:center;border-top:1px solid var(--line);margin-top:22px;padding-top:22px}.qr-panel[hidden]{display:none}.qr-panel img{border:8px solid #fff;box-shadow:0 0 0 1px var(--line);border-radius:8px}.qr-panel h3{margin:14px 0 2px}.qr-panel p{color:var(--muted);margin:0}.mock-link{display:inline-block;margin-top:16px;color:var(--red);font-weight:700}.terms details{border-top:1px solid var(--line);padding:15px 0}.terms details:first-of-type{border-top:0}.terms summary{cursor:pointer;font-weight:750}.terms li{margin:7px 0;color:#556070;font-size:14px}.result-card{max-width:680px;margin:70px auto;text-align:center;padding:52px}.check{width:66px;height:66px;border-radius:50%;background:#dcfce7;color:var(--green);font-size:36px;font-weight:800;display:grid;place-items:center;margin:0 auto 18px}.error .check{background:#fee2e2;color:var(--red)}.result-card h1{font-size:30px;margin:7px 0}.result-card>p{color:var(--muted)}.result-card dl{text-align:left;margin:28px 0;border-top:1px solid var(--line)}.result-card dl div{display:flex;justify-content:space-between;gap:20px;padding:12px 0;border-bottom:1px solid var(--line)}.result-card dt{color:var(--muted)}.result-card dd{margin:0;font-weight:700;word-break:break-all}.link-button{display:block;text-decoration:none}footer{text-align:center;color:#98a2b3;font-size:12px;padding:12px 20px 34px}@media(max-width:620px){.shell{margin:20px auto;padding:0 12px}.topbar{padding:0 16px}.hero{padding:24px;align-items:flex-start}.hero h1{font-size:27px}.hero p{font-size:14px}.price b{font-size:38px}.card{padding:22px 18px}.channels{grid-template-columns:1fr}.result-card{margin:30px auto;padding:36px 20px}}