:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --primary: #1d4ed8;
  --primary-soft: #dbeafe;
  --text: #1f2937;
  --muted: #6b7280;
  --edge: #e5e7eb;
  --green: #16a34a;
  --gold: #d97706;
  --red: #dc2626;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background: #111827;
  color: white;
  padding: 24px 18px;
}

.sidebar h1 {
  margin: 0 0 24px;
  font-size: 1.5rem;
}

.sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar a {
  color: white;
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(255,255,255,0.04);
}

.sidebar a.logout-link {
  margin-top: 18px;
  background: rgba(220, 38, 38, 0.22);
}

.content {
  flex: 1;
  padding: 28px;
}

.topbar {
  margin-bottom: 24px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 18px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: 14px;
  padding: 18px;
  box-shadow: 0 8px 18px rgba(17, 24, 39, 0.05);
}

.stat-card span {
  display: block;
  color: var(--muted);
  margin-bottom: 10px;
}

.stat-card strong {
  font-size: 1.6rem;
}

.accent-blue { border-top: 4px solid var(--primary); }
.accent-green { border-top: 4px solid var(--green); }
.accent-gold { border-top: 4px solid var(--gold); }
.accent-red { border-top: 4px solid var(--red); }

.panel {
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: 14px;
  padding: 18px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.panel-head h3 {
  margin: 0;
}

.primary-btn,
.secondary-btn,
.table-btn,
.icon-btn {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  font-size: 0.92rem;
}

.primary-btn {
  background: var(--primary);
  color: #fff;
}

.secondary-btn {
  background: #e5e7eb;
  color: #111827;
}

.table-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.table-btn {
  background: #dbeafe;
  color: #1e3a8a;
  padding: 7px 10px;
}

.table-btn.danger {
  background: #fee2e2;
  color: #991b1b;
}

.table-btn.success {
  background: #dcfce7;
  color: #166534;
}

.table-btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

.table-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

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

th, td {
  text-align: right;
  padding: 12px 10px;
  border-bottom: 1px solid var(--edge);
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 50;
}

.modal.hidden {
  display: none;
}

.modal-card {
  width: min(680px, 100%);
  background: #fff;
  border-radius: 14px;
  border: 1px solid var(--edge);
  box-shadow: 0 25px 60px rgba(2, 6, 23, 0.2);
  padding: 18px;
}

.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.modal-head h3 {
  margin: 0;
}

.icon-btn {
  width: 38px;
  height: 38px;
  background: #e5e7eb;
  color: #111827;
}

.booking-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.booking-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.92rem;
}

.booking-form input,
.booking-form select {
  border: 1px solid #d1d5db;
  border-radius: 10px;
  padding: 10px 12px;
}

.form-actions {
  grid-column: 1 / -1;
  display: flex;
  gap: 8px;
  justify-content: flex-start;
}

@media (max-width: 840px) {
  .shell {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
  }

  .content {
    padding: 16px;
  }

  .booking-form {
    grid-template-columns: 1fr;
  }
}