:root {
  --bg: #0b0f1a;
  --bg-soft: #111827;
  --card: #151d2e;
  --border: #243049;
  --text: #e5e9f0;
  --muted: #8b94a7;
  --accent: #38bdf8;
  --accent-2: #818cf8;
  --green: #34d399;
  --red: #f87171;
  --yellow: #fbbf24;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.muted { color: var(--muted); }
.mono { font-family: 'Cascadia Code', 'Fira Code', monospace; }

/* Nav */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 32px;
  background: rgba(11, 15, 26, 0.9);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}
.nav nav { display: flex; gap: 22px; align-items: center; }
.nav nav a { color: var(--text); font-size: 15px; }
.brand { font-size: 22px; font-weight: 800; letter-spacing: -0.5px; color: var(--text); }
.brand span { color: var(--accent); }

/* Buttons */
.btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06121f !important;
  font-weight: 700;
  border: none;
  border-radius: 8px;
  padding: 12px 26px;
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.1s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-small { padding: 7px 16px; font-size: 14px; }
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text) !important;
}

/* Hero */
.hero {
  text-align: center;
  padding: 90px 24px 70px;
  background: radial-gradient(ellipse at 50% -20%, rgba(56, 189, 248, 0.15), transparent 60%);
}
.hero h1 { font-size: 52px; letter-spacing: -1.5px; margin-bottom: 16px; }
.hero h1 span { background: linear-gradient(135deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { font-size: 19px; color: var(--muted); max-width: 640px; margin: 0 auto 30px; }

/* Sections */
.section { max-width: 1080px; margin: 0 auto; padding: 56px 24px; }
.section h2 { font-size: 30px; margin-bottom: 8px; letter-spacing: -0.5px; }
.section .sub { color: var(--muted); margin-bottom: 32px; }

/* Grid + cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 16px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}
.card h3 { font-size: 17px; margin-bottom: 6px; }
.card .price { color: var(--green); font-weight: 700; }
.card .meta { color: var(--muted); font-size: 13px; margin-top: 4px; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.step-num {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06121f; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 12px;
}

/* FAQ */
.faq details { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 16px 20px; margin-bottom: 12px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin-top: 10px; color: var(--muted); }

/* Forms */
.form { max-width: 420px; margin: 60px auto; background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 32px; }
.form h2 { margin-bottom: 20px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 14px; color: var(--muted); margin-bottom: 6px; }
.field input {
  width: 100%;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 11px 14px;
  font-size: 15px;
}
.field input:focus { outline: none; border-color: var(--accent); }
.form .btn { width: 100%; margin-top: 6px; }
.form-error { color: var(--red); font-size: 14px; margin: 10px 0; min-height: 20px; }
.form .alt { margin-top: 16px; text-align: center; font-size: 14px; color: var(--muted); }

/* Dashboard */
.dash { max-width: 1080px; margin: 0 auto; padding: 40px 24px; }
.dash-header { display: flex; justify-content: space-between; align-items: flex-end; flex-wrap: wrap; gap: 20px; margin-bottom: 28px; }
.balance-box .amount { font-size: 44px; font-weight: 800; color: var(--green); letter-spacing: -1px; }
.balance-box .label { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: 1px; }
.apikey-box { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.apikey-box code {
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: 8px;
  padding: 9px 14px; font-size: 14px; color: var(--accent);
}
.panel { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 22px; margin-bottom: 24px; }
.panel h3 { margin-bottom: 14px; font-size: 18px; }
.topup-row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.topup-row input, .topup-row select {
  background: var(--bg-soft); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); padding: 10px 14px; font-size: 15px;
}
.topup-row input { width: 140px; }
.topup-row select { max-width: 320px; }

/* Tables */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; padding: 8px 10px; border-bottom: 1px solid var(--border); }
td { padding: 9px 10px; border-bottom: 1px solid rgba(36, 48, 73, 0.5); }
tr:last-child td { border-bottom: none; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 700; }
.badge.active { background: rgba(251, 191, 36, 0.15); color: var(--yellow); }
.badge.completed, .badge.paid { background: rgba(52, 211, 153, 0.15); color: var(--green); }
.badge.cancelled, .badge.expired, .badge.failed { background: rgba(248, 113, 113, 0.15); color: var(--red); }
.badge.pending { background: rgba(251, 191, 36, 0.15); color: var(--yellow); }
.amount-pos { color: var(--green); }
.amount-neg { color: var(--red); }

/* Docs */
.docs { max-width: 860px; margin: 0 auto; padding: 48px 24px; }
.docs h1 { font-size: 36px; margin-bottom: 10px; }
.docs h2 { font-size: 24px; margin: 40px 0 12px; padding-top: 16px; border-top: 1px solid var(--border); }
.docs h3 { font-size: 18px; margin: 24px 0 8px; }
.docs p, .docs li { color: var(--muted); }
.docs ul { padding-left: 22px; }
.docs code { background: var(--bg-soft); padding: 2px 7px; border-radius: 5px; font-size: 13px; color: var(--accent); }
.docs pre {
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px;
  padding: 16px 18px; overflow-x: auto; margin: 12px 0; font-size: 13.5px; line-height: 1.5;
}
.docs pre code { background: none; padding: 0; color: var(--text); }
.docs table { margin: 12px 0; }

/* Footer */
.footer { border-top: 1px solid var(--border); padding: 36px 24px; text-align: center; color: var(--muted); font-size: 14px; }
.footer .brand { margin-bottom: 8px; }

.toast {
  position: fixed; bottom: 24px; right: 24px;
  background: var(--card); border: 1px solid var(--accent);
  border-radius: 10px; padding: 12px 20px; font-size: 14px;
  animation: fadein 0.2s;
}
@keyframes fadein { from { opacity: 0; transform: translateY(6px); } }

@media (max-width: 640px) {
  .hero h1 { font-size: 36px; }
  .nav { padding: 12px 16px; }
  .nav nav { gap: 14px; }
}
.usdt-box { margin-top: 14px; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px; padding: 16px 18px; }
.usdt-box ul { margin: 10px 0; padding-left: 18px; font-size: 13px; }
.usdt-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 8px 0; }
.usdt-row code { word-break: break-all; }