:root{
  --bg:#0d1117; --panel:#161b22; --line:#26303d; --text:#e6edf3;
  --muted:#8b949e; --accent:#f0883e; --accent2:#58a6ff; --ok:#2ea043;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6}
a{color:var(--accent2);text-decoration:none}
a:hover{text-decoration:underline}
.testbar{background:#3d2a12;color:#f0c674;text-align:center;padding:6px 12px;font-size:13px;border-bottom:1px solid #5a3d1a}
header{display:flex;justify-content:space-between;align-items:center;padding:14px 28px;
  border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(13,17,23,.9);backdrop-filter:blur(8px)}
.logo{font-size:20px;font-weight:700;color:var(--text)}
nav{display:flex;align-items:center;gap:18px}
.credits{background:var(--panel);border:1px solid var(--line);padding:4px 10px;border-radius:20px;font-size:13px;color:var(--accent)}
main{max-width:980px;margin:0 auto;padding:36px 20px 60px}
footer{text-align:center;color:var(--muted);font-size:13px;padding:30px;border-top:1px solid var(--line)}
.btn{display:inline-block;background:var(--accent);color:#1a1206;font-weight:600;
  padding:9px 18px;border-radius:8px;border:none;cursor:pointer;font-size:15px}
.btn:hover{filter:brightness(1.08);text-decoration:none}
.btn.ghost{background:transparent;color:var(--text);border:1px solid var(--line)}
.btn.big{padding:13px 26px;font-size:17px}
.accent{color:var(--accent)}
.muted{color:var(--muted)}
.hero{text-align:center;padding:50px 0 30px}
.hero h1{font-size:42px;line-height:1.25;margin:0 0 16px}
.hero .sub{font-size:18px;color:var(--muted);max-width:620px;margin:0 auto 28px}
.cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
section{margin-top:48px}
h2{font-size:26px;text-align:center}
.demo-grid,.plan-grid{display:grid;gap:18px;margin-top:22px}
.demo-grid{grid-template-columns:1fr 1fr}
.plan-grid{grid-template-columns:repeat(3,1fr)}
.demo-card,.plan-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:22px;text-align:center}
.demo-card audio{width:100%;margin-top:10px}
.plan-card.featured{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent) inset}
.price{font-size:34px;font-weight:700;margin:8px 0}
.price span{font-size:15px;color:var(--muted);font-weight:400}
.credits-line{color:var(--accent);font-weight:600}
.form-wrap{max-width:380px;margin:0 auto;text-align:center}
.card-form{display:flex;flex-direction:column;gap:14px;text-align:left;margin:20px 0}
.card-form label{display:flex;flex-direction:column;gap:6px;font-size:14px;color:var(--muted)}
.card-form input{background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:11px;color:var(--text);font-size:15px}
.flash{background:#11301c;border:1px solid var(--ok);color:#7ee2a8;border-radius:8px;padding:10px 16px;margin-bottom:20px}
.flash p{margin:4px 0}
.balance-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:26px;text-align:center;margin:18px 0 30px}
.balance-label{color:var(--muted);font-size:14px}
.balance-big{font-size:40px;font-weight:700;color:var(--accent);margin:8px 0 18px}
.balance-big span{font-size:16px;color:var(--muted);font-weight:400}
table.orders{width:100%;border-collapse:collapse;margin-top:14px;font-size:14px}
table.orders th,table.orders td{border-bottom:1px solid var(--line);padding:10px;text-align:left}
.badge{background:#11301c;color:#7ee2a8;border-radius:6px;padding:2px 8px;font-size:12px}
.checkout-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:22px;margin:18px 0;text-align:left}
.checkout-card .row{display:flex;justify-content:space-between;padding:8px 0}
.checkout-card .total{border-top:1px solid var(--line);margin-top:8px;padding-top:14px;font-size:18px}
.test-note{background:#1a2330;border:1px solid var(--accent2);border-radius:10px;padding:14px 16px;font-size:14px;color:#cdd9e5;text-align:left;margin-bottom:18px}
@media(max-width:760px){.demo-grid,.plan-grid{grid-template-columns:1fr}.hero h1{font-size:32px}}