:root{--bg:#0b1017;--panel:#121a26;--line:#223046;--text:#e8eef6;--muted:#9fb0c3;--gold:#f0b429;--green:#2fbf71;--red:#ff5c5c}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.7}
a{color:var(--gold)}header,main,footer{max-width:1080px;margin:0 auto;padding:0 20px}
header{padding:28px 20px 8px;display:flex;justify-content:space-between;align-items:center}h1{font-size:28px;margin:0}h2{font-size:26px;margin:8px 0 12px}.sub{color:var(--muted)}
.hero{display:grid;grid-template-columns:.8fr 1.2fr;gap:28px;align-items:center;padding:32px 0}.hero img{width:100%;border:1px solid var(--line);border-radius:12px}
.badge{display:inline-block;border:1px solid var(--gold);color:var(--gold);border-radius:999px;padding:4px 12px;font-size:13px}
section{padding:36px 0;border-top:1px solid var(--line)}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.plan{cursor:pointer}.plan.selected{border-color:var(--gold);box-shadow:0 0 0 1px var(--gold) inset}.plan.disabled{opacity:.45;cursor:not-allowed}.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:20px}
.paymethods{display:grid;grid-template-columns:1fr 1fr;gap:12px}.paymethod{display:flex;align-items:center;gap:10px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 16px;cursor:pointer}.paymethod.selected{border-color:var(--gold);box-shadow:0 0 0 1px var(--gold) inset}.paymethod.disabled{opacity:.45;cursor:not-allowed}.paymethod input[type="radio"]{accent-color:var(--gold);width:18px;height:18px;flex:none;margin:0}.pay-body{display:flex;flex-direction:column;gap:4px;min-width:0}.pay-logos{display:flex;align-items:center;gap:8px;flex-wrap:wrap;background:#fff;border-radius:8px;padding:6px 10px}.pay-logo{display:inline-flex;align-items:center}.paypal-logo{color:#009CDE;font-weight:800;font-style:italic;font-size:19px;letter-spacing:-.5px}.visa-logo{color:#1A1F71;font-weight:800;font-style:italic;font-size:16px;letter-spacing:.5px}.wechat-logo{flex:none}.pay-name{font-size:13px;color:var(--muted)}
.price{font-size:30px;color:var(--gold)}label{display:block;margin:12px 0 6px;color:var(--muted)}
input,select{width:100%;padding:12px;border:1px solid var(--line);border-radius:8px;background:#0b1017;color:var(--text);font-size:16px}
button{background:var(--gold);color:#111;border:0;border-radius:8px;padding:12px 20px;font-size:16px;cursor:pointer;margin-top:14px;transition:transform .12s ease,filter .15s ease,opacity .15s ease;-webkit-tap-highlight-color:transparent;touch-action:manipulation}
button:active:not(:disabled){transform:scale(.96);filter:brightness(.9)}
button:disabled{opacity:.55;cursor:not-allowed;transform:none}
button:focus-visible{outline:2px solid var(--gold);outline-offset:2px}
button.secondary{background:transparent;border:1px solid var(--line);color:var(--text)}
a.btn{display:inline-block;background:var(--gold);color:#111;border-radius:8px;padding:12px 20px;font-size:16px;cursor:pointer;margin-top:14px;text-decoration:none}
.demo{background:#3a2c00;border:1px solid var(--gold);border-radius:8px;padding:12px;margin:14px 0;color:#ffe9a8}
.result{background:#0b1017;border:1px solid var(--line);border-radius:8px;padding:14px;margin-top:14px;white-space:pre-wrap;word-break:break-all}
.result.warn{color:var(--gold);border-color:var(--gold);background:#3a2c00}
.small{font-size:13px;color:var(--muted)}footer{padding:24px 20px 48px;color:var(--muted);font-size:13px}
@media(max-width:760px){.hero,.grid{grid-template-columns:1fr}.grid4{grid-template-columns:1fr 1fr}}