:root {
  --bg: #0f172a;
  --panel: #111827;
  --panel-2: #1f2937;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --accent: #22c55e;
  --danger: #ef4444;
  --border: #334155;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background: linear-gradient(180deg, #0b1220, #111827);
  color: var(--text);
}

.layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 0 24px;
}

.site-header h1 { margin: 0; }
.site-header p { margin: 6px 0 0; color: var(--muted); }
.site-header nav { display: flex; gap: 12px; flex-wrap: wrap; }

.site-header a,
.button-link,
.admin-tabs .tab {
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--border);
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(255,255,255,0.02);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.site-header a:hover,
.button-link:hover,
.admin-tabs .tab:hover {
  background: rgba(255,255,255,0.05);
  border-color: #475569;
}

.hero,
.card {
  background: rgba(17,24,39,0.88);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.18);
}

.hero {
  padding: 24px;
  margin-bottom: 18px;
}

.card {
  padding: 20px;
}

.card.narrow {
  margin-top: 48px;
}

.grid.two {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 18px;
}

.grid.three,
.grid.four {
  display: grid;
  gap: 16px;
}

.grid.three { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid.four { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.grid.compact { gap: 10px; }

.admin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.admin-grid.single {
  max-width: 420px;
  margin: 0 auto;
}

.admin-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.admin-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.admin-head {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.admin-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.admin-tabs .tab.active {
  background: rgba(34,197,94,0.15);
  border-color: rgba(34,197,94,0.6);
}

.push-right {
  margin-left: auto;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(160px, 1fr));
  gap: 12px;
}

.stat-box {
  min-width: 0;
}

.stat-box h3 {
  margin: 0 0 10px;
  font-size: 0.95rem;
  color: var(--muted);
}

.stat {
  margin: 0;
  font-size: 2rem;
  line-height: 1.15;
  word-break: break-word;
}

label {
  display: block;
  margin: 12px 0;
  color: var(--muted);
}

input,
textarea,
select,
button {
  width: 100%;
  margin-top: 6px;
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 12px;
  background: var(--panel-2);
  color: var(--text);
}

button {
  background: var(--accent);
  color: #052e16;
  font-weight: 700;
  cursor: pointer;
  border: none;
}

.inline-form {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.inline-form select,
.inline-form button,
.inline-form a {
  width: auto;
}

.danger-inline button {
  background: #f59e0b;
  color: #111827;
}

pre,
code {
  white-space: pre-wrap;
  word-break: break-word;
  background: #020617;
  color: #cbd5e1;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid #1e293b;
}

.challenge {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.hidden { display: none; }
.muted { color: var(--muted); }
.checkbox-row { display: flex; align-items: center; gap: 10px; }
.checkbox-row input { width: auto; margin-top: 0; }

.section-title {
  margin-top: 0;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  text-align: left;
  padding: 10px;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  vertical-align: top;
}

ol { padding-left: 20px; }

@media (max-width: 900px) {
  .stat-row {
    grid-template-columns: repeat(2, minmax(160px, 1fr));
  }
}

@media (max-width: 760px) {
  .site-header,
  .inline-form {
    flex-direction: column;
    align-items: stretch;
  }

  .push-right {
    margin-left: 0;
  }

  .admin-tabs {
    align-items: stretch;
  }

  .admin-tabs .tab,
  .button-link {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .layout {
    padding: 16px;
  }

  .stat-row {
    grid-template-columns: 1fr;
  }
}