:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface2: #243044;
  --border: #2d3f56;
  --text: #e8edf4;
  --muted: #8b9cb3;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --success: #22c55e;
  --success-bg: rgba(34, 197, 94, 0.12);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.12);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.12);
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem;
}

/* Nav */
.nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}

.nav-brand:hover {
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  font-size: 0.9rem;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: var(--surface2);
  text-decoration: none;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.stat-card .value {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
}

.stat-card .label {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

.stat-card.total .value { color: var(--primary); }
.stat-card.occupied .value { color: var(--danger); }
.stat-card.free .value { color: var(--success); }

/* Cards & panels */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow);
}

.panel h2 {
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Room board */
.room-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.room-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color 0.2s, transform 0.15s;
}

.room-card:hover {
  transform: translateY(-2px);
}

.room-card.occupied {
  border-color: var(--danger);
  background: linear-gradient(135deg, var(--surface) 0%, var(--danger-bg) 100%);
}

.room-card.free {
  border-color: var(--success);
  background: linear-gradient(135deg, var(--surface) 0%, var(--success-bg) 100%);
}

.room-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
  gap: 0.5rem;
}

.room-card-header h3 {
  font-size: 1.1rem;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-free {
  background: var(--success-bg);
  color: var(--success);
}

.badge-occupied {
  background: var(--danger-bg);
  color: var(--danger);
}

.badge-manual {
  background: var(--warning-bg);
  color: var(--warning);
}

.room-card-body {
  font-size: 0.9rem;
  color: var(--muted);
  min-height: 4rem;
}

.room-card-body strong {
  color: var(--text);
  display: block;
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

.room-card-actions {
  margin-top: 1rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.6rem 0.85rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.55rem 1rem;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s, opacity 0.15s;
}

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

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--border);
}

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

.btn-danger:hover:not(:disabled) {
  opacity: 0.9;
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
}

.btn-block {
  width: 100%;
}

/* Table */
.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th, td {
  padding: 0.65rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
}

.status-upcoming { color: var(--warning); }
.status-active { color: var(--success); }
.status-past { color: var(--muted); }

/* Lists */
.list-item {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.list-item:last-child {
  border-bottom: none;
}

.empty-state {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
}

/* Login */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}

.login-box {
  width: 100%;
  max-width: 380px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

.login-box h1 {
  font-size: 1.35rem;
  margin-bottom: 0.25rem;
}

.login-box p {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* Alerts */
.alert {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.alert-error {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid var(--danger);
}

.alert-success {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid var(--success);
}

/* Quick actions */
.quick-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.page-title {
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.hidden {
  display: none !important;
}

.loading {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
}

.filter-bar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  align-items: flex-end;
}

.filter-bar .form-group {
  margin-bottom: 0;
  min-width: 140px;
}

.settings-section {
  margin-bottom: 2rem;
}

.settings-section h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--text);
}

.room-manage-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.room-manage-item input[type="text"] {
  flex: 1;
  min-width: 120px;
  padding: 0.45rem 0.65rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
}