:root {
  --bg: #0f1419;
  --surface: #1a222c;
  --text: #e8eef4;
  --muted: #8b9aab;
  --accent: #3d9a6a;
  --accent-hover: #4cb37c;
  --danger: #d45b5b;
  --ok: #3d9a6a;
  --border: #2a3542;
  --font: "Segoe UI", "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  background: radial-gradient(ellipse at top, #1a2836 0%, var(--bg) 55%);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}
a { color: var(--accent-hover); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}
.brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  letter-spacing: 0.02em;
}
.site-header nav { display: flex; gap: 1rem; align-items: center; }
.site-header nav a { color: var(--muted); }
.site-header nav a:hover { color: var(--text); }

main { padding: 2rem 1.5rem 4rem; max-width: 960px; margin: 0 auto; }
main.narrow { max-width: 480px; }

.hero { padding: 3rem 0 2rem; }
.hero h1 { font-size: 2.75rem; margin: 0 0 0.5rem; letter-spacing: -0.02em; }
.lede { font-size: 1.15rem; color: var(--muted); max-width: 36rem; }
.cta-row { display: flex; gap: 0.75rem; margin-top: 1.5rem; flex-wrap: wrap; }

.section { margin-top: 2.5rem; }
.section h2 { font-size: 1.25rem; margin-bottom: 1rem; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.65rem 1.2rem;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { background: var(--accent-hover); text-decoration: none; color: #fff; }
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--muted); background: var(--surface); color: var(--text); }
.btn-sm { padding: 0.35rem 0.8rem; font-size: 0.9rem; }

.form { display: flex; flex-direction: column; gap: 1rem; margin: 1.5rem 0; }
.form label { display: flex; flex-direction: column; gap: 0.35rem; font-size: 0.9rem; color: var(--muted); }
.form input {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.65rem 0.75rem;
  color: var(--text);
  font-size: 1rem;
}

.plan-list { display: grid; gap: 1rem; }
.plan {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
}
.price { font-size: 1.5rem; font-weight: 600; margin: 0.25rem 0 1rem; }
.price span { font-size: 0.9rem; font-weight: 400; color: var(--muted); }

.coin-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 0.75rem; margin-top: 1rem; }
.coin-card button {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  color: var(--text);
  cursor: pointer;
}
.coin-card button:hover { border-color: var(--accent); }

.pay-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  margin-top: 1rem;
}
.qr { display: block; margin: 0 auto 1rem; border-radius: 8px; background: #fff; }
.address {
  display: block;
  word-break: break-all;
  background: var(--bg);
  padding: 0.75rem;
  border-radius: 6px;
  font-size: 0.85rem;
}
.label { color: var(--muted); display: inline-block; min-width: 5rem; }

.error { color: var(--danger); }
.ok { color: var(--ok); }
.muted { color: var(--muted); }
.site-footer { text-align: center; padding: 2rem; color: var(--muted); font-size: 0.85rem; }

main.wide { max-width: 1100px; }
.admin-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.admin-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  color: var(--text);
}
.admin-card:hover { border-color: var(--accent); text-decoration: none; }
.admin-card h2 { margin: 0 0 0.5rem; font-size: 1.15rem; }
.admin-card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.table-wrap { overflow-x: auto; margin-top: 1rem; }
.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.admin-table th,
.admin-table td {
  text-align: left;
  padding: 0.65rem 0.5rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.admin-table th { color: var(--muted); font-weight: 600; }
.admin-table .actions { white-space: nowrap; }
.inline-form { display: inline-flex; gap: 0.35rem; align-items: center; margin: 0.15rem 0.25rem 0.15rem 0; }
.input-sm {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.3rem 0.45rem;
  color: var(--text);
  font-size: 0.85rem;
  max-width: 10rem;
}
.btn-danger {
  background: transparent;
  border: 1px solid var(--danger);
  color: var(--danger);
}
.btn-danger:hover { background: rgba(212, 91, 91, 0.15); color: #fff; border-color: var(--danger); }
.mono { font-family: ui-monospace, Consolas, monospace; font-size: 0.85rem; word-break: break-all; }
.admin-form { max-width: 920px; }
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}
.form-grid label.checkbox {
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.6rem;
}
.form-grid input[type="checkbox"] { width: auto; }