:root {
  --bg: #f3f5f7;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #0b3b75;
  --brand-soft: #eaf2ff;
  --ok: #0f766e;
  --error: #b91c1c;
  --pending: #9a3412;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background: linear-gradient(160deg, #f9fbfc 0%, #eef2f7 100%);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.container {
  width: min(1150px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  border-bottom: 1px solid var(--line);
  background: var(--card);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.brand {
  text-decoration: none;
  color: var(--brand);
  font-weight: 700;
}

.nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.nav a {
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  padding: 6px 10px;
  border-radius: 8px;
}

.nav a:hover {
  background: var(--brand-soft);
}

.page {
  padding: 24px 0 48px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  margin-bottom: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
}

.grid {
  display: grid;
  gap: 12px;
}

.stats-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.stat h2 {
  margin: 0 0 6px;
  font-size: 15px;
  color: var(--muted);
}

.stat strong {
  display: block;
  font-size: 26px;
}

.stat span {
  color: var(--muted);
  font-size: 13px;
}

.table-wrap {
  overflow: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 700px;
}

th,
td {
  text-align: left;
  border-bottom: 1px solid var(--line);
  padding: 10px 8px;
  vertical-align: top;
  font-size: 13px;
}

th {
  color: var(--muted);
  font-weight: 600;
}

pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 12px;
}

.badge {
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 12px;
  border: 1px solid var(--line);
  display: inline-block;
}

.badge.pending {
  background: #fff7ed;
  color: var(--pending);
}

.badge.paid {
  background: #ecfeff;
  color: var(--ok);
}

.badge.expired,
.badge.failed {
  background: #fef2f2;
  color: var(--error);
}

.btn {
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  background: var(--brand);
  color: #fff;
  font-weight: 600;
}

.btn-sm {
  padding: 7px 10px;
  font-size: 12px;
}

.form-grid {
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

input,
textarea {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  font: inherit;
  color: var(--text);
  background: #fff;
}

.alert {
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 12px;
  font-size: 13px;
}

.alert.success {
  background: #ecfdf5;
  color: var(--ok);
}

.alert.error {
  background: #fef2f2;
  color: var(--error);
}

.login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}

.login-card {
  width: min(420px, 100%);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

.login-card h1 {
  margin: 0 0 6px;
  font-size: 24px;
}

.login-card p {
  margin: 0 0 16px;
  color: var(--muted);
}

@media (max-width: 900px) {
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .topbar-inner {
    flex-wrap: wrap;
    padding: 10px 0;
  }
}