:root {
  --bg: #0f172a;
  --card: #1e293b;
  --border: #334155;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: linear-gradient(160deg, #0f172a 0%, #1e1b4b 50%, #0f172a 100%);
  color: var(--text);
  min-height: 100vh;
}

a { color: #a5b4fc; text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1100px; margin: 0 auto; padding: 1.5rem; }

.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 1.5rem; border-bottom: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.85); backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 50;
}
.nav-brand { font-weight: 700; font-size: 1.125rem; color: #fff; }
.nav-links { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }
.nav-links a { color: var(--muted); font-size: 0.9rem; }
.nav-links a.active, .nav-links a:hover { color: #fff; }

.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 1.5rem; margin-bottom: 1rem;
}
.card h2, .card h3 { margin-top: 0; }

.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.625rem 1.25rem; border-radius: 8px; border: none;
  font-size: 0.9375rem; font-weight: 600; cursor: pointer;
  transition: background 0.15s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-ghost:hover { color: #fff; border-color: var(--muted); }
.btn-block { width: 100%; }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8125rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.375rem; color: var(--muted); font-size: 0.875rem; }
.form-control {
  width: 100%; padding: 0.625rem 0.75rem; border-radius: 8px;
  border: 1px solid var(--border); background: #0f172a; color: var(--text);
  font-size: 0.9375rem;
}
.form-control:focus { outline: 2px solid var(--primary); border-color: transparent; }
select.form-control { cursor: pointer; }

.alert { padding: 0.75rem 1rem; border-radius: 8px; margin-bottom: 1rem; font-size: 0.9rem; }
.alert-error { background: rgba(239,68,68,0.15); border: 1px solid rgba(239,68,68,0.4); color: #fca5a5; }
.alert-success { background: rgba(34,197,94,0.15); border: 1px solid rgba(34,197,94,0.4); color: #86efac; }
.alert-info { background: rgba(99,102,241,0.15); border: 1px solid rgba(99,102,241,0.4); color: #c7d2fe; }

.badge { display: inline-block; padding: 0.2rem 0.5rem; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.badge-success { background: rgba(34,197,94,0.2); color: #86efac; }
.badge-warning { background: rgba(245,158,11,0.2); color: #fcd34d; }
.badge-info { background: rgba(99,102,241,0.2); color: #c7d2fe; }
.badge-muted { background: rgba(148,163,184,0.2); color: #cbd5e1; }
.badge-error { background: rgba(239,68,68,0.2); color: #fca5a5; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
th, td { padding: 0.75rem; text-align: left; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }
.mono { font-family: ui-monospace, monospace; font-size: 0.8125rem; word-break: break-all; }

.hero { text-align: center; padding: 3rem 1rem; }
.hero h1 { font-size: 2rem; margin-bottom: 0.5rem; }
.hero p { color: var(--muted); max-width: 520px; margin: 0 auto 1.5rem; }

.price { font-size: 1.75rem; font-weight: 700; color: #a5b4fc; margin: 0.75rem 0 0.25rem; }
.plan-desc {
  color: var(--muted); font-size: 0.875rem; line-height: 1.6;
  min-height: 2.8rem; margin: 0.5rem 0 0;
}
.plan-desc p { margin: 0.35rem 0; }
.plan-desc ul, .plan-desc ol { margin: 0.35rem 0 0.5rem; padding-left: 1.2rem; }
.plan-desc li { margin-bottom: 0.25rem; }
.plan-desc strong, .plan-desc b { color: #cbd5e1; }
.plan-meta { margin-bottom: 1rem; }
.plan-card { display: flex; flex-direction: column; }
.plan-card .btn-select { margin-top: auto; }
.plan-card-selected { box-shadow: 0 0 0 1px rgba(99, 102, 241, 0.35); }
.packages-intro { margin-bottom: 1.25rem; }
.packages-intro h3 { margin-top: 0; margin-bottom: 0.75rem; font-size: 1.1rem; }
.packages-intro-list {
  margin: 0 0 0.75rem; padding-left: 1.25rem; color: var(--muted); line-height: 1.7;
}
.packages-intro-list li { margin-bottom: 0.35rem; }
.muted { color: var(--muted); font-size: 0.875rem; }

.qr-box { text-align: center; padding: 1rem; background: #fff; border-radius: 8px; display: inline-block; }
.qr-box img { max-width: 220px; }

.countdown { font-size: 1.25rem; font-weight: 700; color: var(--warning); }
.license-key {
  background: #0f172a; border: 1px dashed var(--primary); padding: 1rem;
  border-radius: 8px; word-break: break-all; font-family: ui-monospace, monospace;
}

.admin-layout { display: grid; grid-template-columns: 220px 1fr; min-height: calc(100vh - 57px); }
.admin-sidebar {
  border-right: 1px solid var(--border); padding: 1rem;
  background: rgba(15, 23, 42, 0.6);
}
.admin-sidebar a {
  display: block; padding: 0.625rem 0.75rem; border-radius: 8px;
  color: var(--muted); margin-bottom: 0.25rem;
}
.admin-sidebar a:hover, .admin-sidebar a.active { background: rgba(99,102,241,0.15); color: #fff; text-decoration: none; }
.admin-main { padding: 1.5rem; }

@media (max-width: 768px) {
  .admin-layout { grid-template-columns: 1fr; }
  .admin-sidebar { display: flex; flex-wrap: wrap; gap: 0.25rem; border-right: none; border-bottom: 1px solid var(--border); }
}