:root {
  color-scheme: dark;
  --color-bg: #0f1420;
  --color-bg-elevated: #161d2e;
  --color-bg-card: #1b2438;
  --color-border: #2b3550;
  --color-border-strong: #3c4a6e;
  --color-text: #e6e9f2;
  --color-text-muted: #9aa5bd;
  --color-text-faint: #6b7590;
  --color-primary: #5b8def;
  --color-primary-hover: #78a2f3;
  --color-primary-text: #061127;
  --color-danger: #ef5b6b;
  --color-danger-hover: #f37884;
  --color-success: #3fbf7f;
  --color-warning: #e6b450;
  --color-focus: #8ab4ff;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-primary);
}

a:hover {
  color: var(--color-primary-hover);
}

h1, h2, h3, h4 {
  margin: 0 0 var(--space-md) 0;
  font-weight: 600;
  line-height: 1.25;
}

h1 { font-size: 1.6rem; }
h2 { font-size: 1.3rem; }
h3 { font-size: 1.1rem; }

p {
  margin: 0 0 var(--space-md) 0;
}

:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* App shell */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
}

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

.app-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: center;
}

.app-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-sm) var(--space-sm);
  border-radius: var(--radius-sm);
}

.app-nav a:hover {
  color: var(--color-text);
  background: var(--color-bg-card);
}

.app-nav a.active {
  color: var(--color-primary);
  font-weight: 600;
}

.app-main {
  flex: 1;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-lg);
}

.page {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Cards / panels */

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
}

.panel {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

/* Forms */

.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-row {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.form-row > .field {
  flex: 1 1 200px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

input, select, textarea {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-sm);
  font-family: inherit;
  font-size: 0.95rem;
}

input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
  border-color: var(--color-focus);
}

input:disabled, select:disabled, textarea:disabled, button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

fieldset {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

legend {
  padding: 0 var(--space-sm);
  font-weight: 600;
  color: var(--color-text-muted);
}

/* Buttons */

button {
  font-family: inherit;
  font-size: 0.95rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-strong);
  background: var(--color-bg-card);
  color: var(--color-text);
  padding: var(--space-sm) var(--space-md);
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

button:hover:not(:disabled) {
  background: var(--color-bg-elevated);
  border-color: var(--color-primary);
}

button.primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-text);
  font-weight: 600;
}

button.primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

button.danger {
  background: transparent;
  border-color: var(--color-danger);
  color: var(--color-danger);
}

button.danger:hover:not(:disabled) {
  background: var(--color-danger);
  color: #1a0709;
}

button.link {
  background: none;
  border: none;
  color: var(--color-primary);
  padding: 0;
  text-decoration: underline;
}

.button-row {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* Tables */

.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-bg-card);
}

thead th {
  text-align: left;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-muted);
  background: var(--color-bg-elevated);
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

tbody td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

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

tbody tr:hover {
  background: var(--color-bg-elevated);
}

/* Status badges */

.badge {
  display: inline-block;
  padding: 2px var(--space-sm);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: capitalize;
  border: 1px solid transparent;
}

.badge-available, .badge-confirmed, .badge-active {
  background: rgba(63, 191, 127, 0.15);
  color: var(--color-success);
  border-color: rgba(63, 191, 127, 0.4);
}

.badge-maintenance {
  background: rgba(230, 180, 80, 0.15);
  color: var(--color-warning);
  border-color: rgba(230, 180, 80, 0.4);
}

.badge-retired, .badge-cancelled, .badge-inactive {
  background: rgba(239, 91, 107, 0.15);
  color: var(--color-danger);
  border-color: rgba(239, 91, 107, 0.4);
}

.badge-admin {
  background: rgba(91, 141, 239, 0.15);
  color: var(--color-primary);
  border-color: rgba(91, 141, 239, 0.4);
}

.badge-staff {
  background: rgba(154, 165, 189, 0.15);
  color: var(--color-text-muted);
  border-color: rgba(154, 165, 189, 0.4);
}

/* Status regions */

.status-message {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
}

.status-message:empty {
  display: none;
}

.status-message.error {
  background: rgba(239, 91, 107, 0.12);
  color: var(--color-danger-hover);
  border: 1px solid rgba(239, 91, 107, 0.4);
}

.status-message.success {
  background: rgba(63, 191, 127, 0.12);
  color: var(--color-success);
  border: 1px solid rgba(63, 191, 127, 0.4);
}

.status-message.info {
  background: rgba(91, 141, 239, 0.12);
  color: var(--color-primary-hover);
  border: 1px solid rgba(91, 141, 239, 0.4);
}

.loading-state, .empty-state, .error-state {
  padding: var(--space-lg);
  text-align: center;
  color: var(--color-text-muted);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-md);
}

.error-state {
  color: var(--color-danger-hover);
  border-color: rgba(239, 91, 107, 0.4);
}

/* Pagination */

.pagination {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

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

/* Filter bar */

.filter-bar {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  align-items: flex-end;
}

/* Login page */

.login-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.login-card {
  width: 100%;
  max-width: 380px;
}

.field-error {
  color: var(--color-danger-hover);
  font-size: 0.8rem;
}

.hint {
  color: var(--color-text-faint);
  font-size: 0.8rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(4, 7, 14, 0.65);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: var(--space-xl) var(--space-md);
  overflow-y: auto;
  z-index: 50;
}

.modal {
  width: 100%;
  max-width: 480px;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-card);
}

@media (max-width: 640px) {
  .app-header {
    flex-direction: column;
    align-items: stretch;
  }

  .app-main {
    padding: var(--space-md);
  }

  .page-header {
    flex-direction: column;
    align-items: stretch;
  }
}