:root {
  color-scheme: dark;
  --color-bg: #0f1115;
  --color-bg-alt: #161922;
  --color-surface: #1c202b;
  --color-surface-raised: #232838;
  --color-border: #2e3444;
  --color-border-strong: #3f4759;
  --color-text: #e6e9f0;
  --color-text-muted: #a3aabd;
  --color-text-faint: #6b7284;
  --color-primary: #5b8cff;
  --color-primary-hover: #7ba0ff;
  --color-primary-text: #06101f;
  --color-success: #3ecf8e;
  --color-success-bg: rgba(62, 207, 142, 0.12);
  --color-warning: #e8b339;
  --color-warning-bg: rgba(232, 179, 57, 0.12);
  --color-danger: #f0616e;
  --color-danger-bg: rgba(240, 97, 110, 0.12);
  --color-info: #5b8cff;
  --color-info-bg: rgba(91, 140, 255, 0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.45);
  --focus-ring: 0 0 0 3px rgba(91, 140, 255, 0.45);
  --transition-fast: 120ms ease;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  min-height: 100vh;
}

h1,
h2,
h3,
h4 {
  color: var(--color-text);
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 var(--space-3) 0;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.375rem; }
h3 { font-size: 1.125rem; }
h4 { font-size: 1rem; }

p {
  margin: 0 0 var(--space-3) 0;
  color: var(--color-text-muted);
}

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: var(--color-primary-text);
  padding: var(--space-2) var(--space-4);
  z-index: 1000;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  left: var(--space-3);
  top: var(--space-3);
}

/* --- App shell --- */

.app-header {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header .brand {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-text);
}

.app-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.app-nav a {
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background var(--transition-fast), color var(--transition-fast);
}

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

.app-nav a[aria-current="page"] {
  color: var(--color-primary-text);
  background: var(--color-primary);
}

main#main-content {
  display: block;
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--space-5);
  min-height: calc(100vh - 64px);
}

.page {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.page-header-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* --- Cards & surfaces --- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}

.card + .card {
  margin-top: var(--space-4);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
}

.stat-card {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.stat-card .stat-label {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-1);
}

.stat-card .stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

/* --- Forms --- */

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

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

.field .hint {
  font-size: 0.75rem;
  color: var(--color-text-faint);
}

input,
select,
textarea {
  background: var(--color-bg);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: inherit;
  font-size: 0.95rem;
  padding: var(--space-2) var(--space-3);
  width: 100%;
}

input::placeholder,
textarea::placeholder {
  color: var(--color-text-faint);
}

input:disabled,
select:disabled,
textarea:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

fieldset {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

legend {
  padding: 0 var(--space-2);
  color: var(--color-text-muted);
  font-weight: 600;
}

form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* --- Buttons --- */

button,
.btn {
  appearance: none;
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface-raised);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-4);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
}

button:hover,
.btn:hover {
  background: var(--color-border);
}

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

button.primary,
.btn.primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-text);
}

button.primary:hover,
.btn.primary:hover {
  background: var(--color-primary-hover);
}

button.danger,
.btn.danger {
  background: var(--color-danger-bg);
  border-color: var(--color-danger);
  color: var(--color-danger);
}

button.danger:hover,
.btn.danger:hover {
  background: var(--color-danger);
  color: #1a0507;
}

button.ghost,
.btn.ghost {
  background: transparent;
  border-color: transparent;
  color: var(--color-primary);
}

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

.btn-sm {
  padding: var(--space-1) var(--space-2);
  font-size: 0.8rem;
}

/* --- Tables --- */

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

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

thead th {
  text-align: left;
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  font-weight: 600;
  padding: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

tbody td {
  padding: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  vertical-align: top;
}

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

tbody tr:hover {
  background: var(--color-surface-raised);
}

table a {
  font-weight: 600;
}

/* --- Status / badges --- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: capitalize;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border-strong);
  color: var(--color-text-muted);
}

.badge.success { background: var(--color-success-bg); color: var(--color-success); border-color: transparent; }
.badge.warning { background: var(--color-warning-bg); color: var(--color-warning); border-color: transparent; }
.badge.danger { background: var(--color-danger-bg); color: var(--color-danger); border-color: transparent; }
.badge.info { background: var(--color-info-bg); color: var(--color-info); border-color: transparent; }

/* --- Status regions (loading / empty / error) --- */

.status-region {
  padding: var(--space-5);
  text-align: center;
  color: var(--color-text-muted);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
}

.status-region.loading {
  color: var(--color-text-muted);
}

.status-region.error {
  color: var(--color-danger);
  border-color: var(--color-danger);
  background: var(--color-danger-bg);
}

.status-region.empty {
  color: var(--color-text-faint);
}

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

.inline-status[data-state="error"] {
  color: var(--color-danger);
}

.inline-status[data-state="success"] {
  color: var(--color-success);
}

/* --- Pagination --- */

.pagination {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  justify-content: flex-end;
  flex-wrap: wrap;
}

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

/* --- Filters bar --- */

.filters-bar {
  display: flex;
  gap: var(--space-3);
  align-items: flex-end;
  flex-wrap: wrap;
}

.filters-bar .field {
  min-width: 160px;
}

/* --- Utility --- */

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

.text-muted { color: var(--color-text-muted); }
.text-faint { color: var(--color-text-faint); }
.text-danger { color: var(--color-danger); }
.text-success { color: var(--color-success); }
.mono { font-family: var(--font-mono); }

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  align-items: center;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-4) 0;
}

@media (max-width: 640px) {
  main#main-content {
    padding: var(--space-3);
  }

  .app-header {
    padding: var(--space-3);
  }
}