:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface-hover: #243044;
  --border: #2d3a4f;
  --text: #e8edf4;
  --text-muted: #8b9cb3;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --unknown: #f59e0b;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

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

a:hover {
  text-decoration: underline;
}

/* —— Login —— */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1.5rem;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59, 130, 246, 0.25), transparent),
    var(--bg);
}

.login-card {
  width: 100%;
  max-width: 400px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: var(--shadow);
}

.login-card h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
  font-weight: 700;
}

.login-card .subtitle {
  color: var(--text-muted);
  margin: 0 0 2rem;
  font-size: 0.95rem;
}

.logo-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent), #6366f1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

/* —— Layout —— */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 240px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 1.5rem 0;
  flex-shrink: 0;
}

.sidebar-brand {
  padding: 0 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}

.sidebar-brand h2 {
  margin: 0;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.75rem 1.25rem;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

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

.sidebar-nav a.active {
  border-right: 3px solid var(--accent);
  color: var(--accent);
}

.sidebar-footer {
  margin-top: auto;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
}

.main-content {
  flex: 1;
  padding: 2rem;
  overflow-x: auto;
}

.page-header {
  margin-bottom: 1.75rem;
}

.page-header h1 {
  margin: 0 0 0.35rem;
  font-size: 1.65rem;
}

.page-header p {
  margin: 0;
  color: var(--text-muted);
}

/* —— Forms —— */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

input[type='text'],
input[type='password'],
input[type='search'],
input[type='date'],
input[type='time'] {
  width: 100%;
  padding: 0.7rem 0.9rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
  transition: border-color 0.15s;
}

input:focus {
  outline: none;
  border-color: var(--accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

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

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.15);
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
}

.btn-block {
  width: 100%;
}

/* —— Cards & table —— */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1.25rem;
}

.toolbar .search-wrap {
  flex: 1;
  min-width: 200px;
  max-width: 320px;
}

.date-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.date-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

.date-wrap input[type='date'],
.date-wrap input[type='time'] {
  width: auto;
  min-width: 10.5rem;
  color-scheme: dark;
}

.date-wrap input[type='date']::-webkit-calendar-picker-indicator,
.date-wrap input[type='time']::-webkit-calendar-picker-indicator {
  filter: invert(0.85);
  cursor: pointer;
}

.filter-chips {
  display: flex;
  gap: 0.5rem;
}

.chip {
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s;
}

.chip:hover,
.chip.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
}

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

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

th,
td {
  padding: 0.85rem 1.25rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
}

.badge-unknown {
  background: rgba(245, 158, 11, 0.2);
  color: var(--warning);
}

.badge-known {
  background: rgba(34, 197, 94, 0.2);
  color: var(--success);
}

.badge-zone {
  background: rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
}

.badge-zone-missing {
  background: rgba(139, 156, 179, 0.15);
  color: var(--text-muted);
}

.zone-select {
  padding: 0.55rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
  min-width: 11rem;
  max-width: 220px;
}

.zone-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.zone-form input {
  flex: 1;
  min-width: 140px;
  max-width: 220px;
  padding: 0.55rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
}

.hint-text {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.hint-text code {
  background: var(--bg);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85em;
}

.mono {
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 0.9em;
  color: var(--text-muted);
}

.empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--text-muted);
}

.empty-state .icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  opacity: 0.5;
}

/* —— Inline pair form —— */
.inline-pair {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.inline-pair input {
  flex: 1;
  min-width: 120px;
  padding: 0.45rem 0.65rem;
  font-size: 0.9rem;
}

.actions-cell {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  white-space: nowrap;
}

/* —— Toast —— */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  padding: 0.85rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  animation: slideIn 0.25s ease;
}

.toast.success {
  border-color: var(--success);
}

.toast.error {
  border-color: var(--danger);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
}

.error-msg {
  color: var(--danger);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}

.stat-card .value {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
}

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

@media (max-width: 768px) {
  .app-layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .sidebar-nav {
    display: flex;
    overflow-x: auto;
  }

  .sidebar-nav a.active {
    border-right: none;
    border-bottom: 3px solid var(--accent);
  }

  .main-content {
    padding: 1.25rem;
  }
}