:root {
  --sidebar: #1f2937;
  --sidebar-light: rgba(255,255,255,.1);
  --panel: #ffffff;
  --body: #f3f6fb;
  --text: #0f172a;
  --muted: #64748b;
  --border: #dbe4ee;
  --primary: #0d47a1;
  --danger: #dc2626;
  --shadow: 0 16px 40px rgba(15, 23, 42, .08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--body);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
}
a { text-decoration: none; color: inherit; }

.admin-layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 280px 1fr;
}
.sidebar {
  background: var(--sidebar);
  color: #fff;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.brand-box {
  background: var(--sidebar-light);
  border-radius: 20px;
  padding: 18px;
  margin-bottom: 8px;
}
.brand-box h2 { margin: 0 0 6px; }
.brand-box p { margin: 0; color: rgba(255,255,255,.7); }
.sidebar a {
  padding: 14px 16px;
  border-radius: 14px;
  color: rgba(255,255,255,.84);
  font-weight: 700;
}
.sidebar a:hover,
.sidebar a.active { background: #0d47a1; color: #fff; }

.main-panel { padding: 28px; }
.topbar {
  background: var(--panel);
  border-radius: 24px;
  padding: 22px 24px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}
.topbar h1 { margin: 0 0 6px; }
.topbar p { margin: 0; color: var(--muted); }
.card {
  background: var(--panel);
  border-radius: 24px;
  padding: 24px;
  box-shadow: var(--shadow);
}
.card h3 { margin-top: 0; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-bottom: 24px;
}
.stat-box {
  background: var(--panel);
  border-radius: 22px;
  padding: 22px;
  box-shadow: var(--shadow);
}
.stat-box span { display: block; color: var(--muted); margin-bottom: 10px; }
.stat-box strong { font-size: 38px; }
.split-grid {
  display: grid;
  grid-template-columns: .95fr 1.05fr;
  gap: 24px;
}
label {
  display: block;
  font-weight: 700;
  margin-bottom: 8px;
  margin-top: 14px;
}
input,
textarea,
button {
  font: inherit;
}
input,
textarea {
  width: 100%;
  padding: 14px 15px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #fff;
}
input[type="file"] {
  padding: 12px;
}
button {
  margin-top: 18px;
  padding: 13px 18px;
  border: 0;
  border-radius: 14px;
  cursor: pointer;
  font-weight: 700;
  background: var(--primary);
  color: #fff;
}
.checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
}
.checkbox input { width: auto; margin: 0; }
.alert {
  padding: 14px 16px;
  border-radius: 14px;
  margin-bottom: 16px;
  font-weight: 700;
}
.alert.success { background: rgba(34,197,94,.12); color: #166534; }
.alert.error { background: rgba(239,68,68,.12); color: #991b1b; }
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  text-align: left;
  padding: 12px 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.action-cell {
  display: flex;
  gap: 8px;
  align-items: center;
}
.action-cell form { margin: 0; }
.small-btn {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 10px;
  background: #e8eef8;
  color: #0f172a;
  font-size: 13px;
  font-weight: 700;
}
.small-btn.danger { background: #fee2e2; color: var(--danger); }
.table-thumb,
.thumb-preview img {
  width: 82px;
  height: 62px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--border);
}
.thumb-preview { margin-top: 12px; }
.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}
.login-card {
  width: min(440px, 100%);
  background: var(--panel);
  border-radius: 24px;
  padding: 30px;
  box-shadow: var(--shadow);
}
.login-card h1 { margin: 0 0 10px; }
.login-card p { color: var(--muted); }
.hint { font-size: 13px; }

@media (max-width: 1100px) {
  .admin-layout,
  .split-grid,
  .stats-grid {
    grid-template-columns: 1fr;
  }
}