:root {
  --primary: #1877F2;
  --primary-dark: #145dbf;
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #1c1e21;
  --muted: #65676b;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --border: #e4e6eb;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 240px;
  background: #111827;
  color: #e5e7eb;
  padding: 20px 0;
  flex-shrink: 0;
}
.sidebar .brand {
  font-size: 20px; font-weight: 700; color: #fff;
  padding: 0 20px 20px; border-bottom: 1px solid #1f2937; margin-bottom: 10px;
}
.sidebar a {
  display: block; padding: 10px 20px; color: #cbd5e1; text-decoration: none; font-size: 14px;
}
.sidebar a:hover, .sidebar a.active { background: var(--primary); color: #fff; }
.main { flex: 1; padding: 24px 32px; }
.topbar {
  display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px;
}
.topbar h1 { font-size: 22px; margin: 0; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 20px; margin-bottom: 20px;
}
.grid { display: grid; gap: 16px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr 1fr; } }
.stat-card { text-align: left; }
.stat-card .num { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-card .label { color: var(--muted); font-size: 13px; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px; border-bottom: 1px solid var(--border); font-size: 14px; }
th { color: var(--muted); font-weight: 600; }
.badge { padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 600; }
.badge-success { background: #dcfce7; color: #15803d; }
.badge-danger { background: #fee2e2; color: #b91c1c; }
.badge-warning { background: #fef3c7; color: #b45309; }
.badge-muted { background: #e5e7eb; color: #374151; }
.btn {
  display: inline-block; padding: 9px 18px; border-radius: 6px; border: none;
  background: var(--primary); color: #fff; font-size: 14px; cursor: pointer; text-decoration: none;
}
.btn:hover { background: var(--primary-dark); }
.btn-danger { background: var(--danger); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
input, select, textarea {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 6px;
  font-size: 14px; margin-bottom: 14px; background: #fff;
}
label { font-size: 13px; font-weight: 600; color: var(--muted); display: block; margin-bottom: 4px; }
.form-row { display: flex; gap: 16px; }
.form-row > div { flex: 1; }
.alert { padding: 12px 16px; border-radius: 6px; margin-bottom: 16px; font-size: 14px; }
.alert-success { background: #dcfce7; color: #15803d; }
.alert-danger { background: #fee2e2; color: #b91c1c; }
.auth-wrap {
  display: flex; align-items: center; justify-content: center; min-height: 100vh;
}
.auth-card { width: 380px; background: #fff; padding: 32px; border-radius: 12px; box-shadow: 0 4px 24px rgba(0,0,0,0.08); }
.auth-card h2 { margin-top: 0; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
.gallery .thumb { position: relative; border-radius: 8px; overflow: hidden; border: 1px solid var(--border); }
.gallery .thumb img, .gallery .thumb video { width: 100%; height: 120px; object-fit: cover; display: block; }
.gallery .thumb .del { position: absolute; top: 4px; right: 4px; background: rgba(0,0,0,.6); color: #fff; border: none; border-radius: 4px; padding: 2px 6px; font-size: 11px; cursor: pointer; }