:root {
  color-scheme: dark;

  --color-bg: #0f1115;
  --color-bg-elevated: #171a21;
  --color-bg-inset: #10131a;
  --color-surface: #1b1f29;
  --color-surface-hover: #232836;
  --color-border: #2b3040;
  --color-border-strong: #3a4157;

  --color-text: #e6e9f0;
  --color-text-muted: #9aa3b7;
  --color-text-faint: #6b7488;

  --color-primary: #5b8def;
  --color-primary-hover: #4879e0;
  --color-primary-text: #08111f;

  --color-success: #3ddc97;
  --color-success-bg: #123024;
  --color-warning: #f5c15a;
  --color-warning-bg: #332609;
  --color-danger: #f2606a;
  --color-danger-bg: #331014;
  --color-danger-hover: #d94a54;

  --color-focus-ring: #86b4ff;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --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: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", monospace;

  --shadow-1: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-2: 0 4px 16px rgba(0, 0, 0, 0.45);
}

* {
  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;
  -webkit-font-smoothing: antialiased;
}

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

h1 { font-size: 1.5rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }

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

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

a:hover,
a:focus-visible {
  text-decoration: underline;
}

:focus {
  outline: none;
}

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

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

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-5);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 20;
  flex-wrap: wrap;
}

.app-header .brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-text);
  white-space: nowrap;
}

.app-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.app-nav a {
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-weight: 500;
}

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

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

.app-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

#health-status {
  font-size: 0.8rem;
  color: var(--color-text-faint);
  white-space: nowrap;
}

#health-status[data-state="ok"] {
  color: var(--color-success);
}

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

#app {
  max-width: 1080px;
  margin: 0 auto;
  padding: var(--space-5);
  min-height: calc(100vh - 64px);
}

/* ---------- Layout helpers ---------- */

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

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

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

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

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

/* ---------- 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-1);
}

/* ---------- Forms ---------- */

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
}

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

input,
select,
textarea {
  font: inherit;
  color: var(--color-text);
  background: var(--color-bg-inset);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  min-width: 0;
}

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

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

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

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-3);
}

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;
}

/* ---------- Buttons ---------- */

button {
  font: inherit;
  cursor: pointer;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-text);
  padding: var(--space-2) var(--space-4);
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

button:hover {
  background: var(--color-surface-hover);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

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

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

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

button.danger:hover {
  background: var(--color-danger-hover);
  color: var(--color-text);
}

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

button.link:hover {
  text-decoration: underline;
  background: none;
}

/* ---------- Tables ---------- */

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

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

thead th {
  text-align: left;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-faint);
  background: var(--color-bg-elevated);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

tbody td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

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

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

/* ---------- 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;
  border: 1px solid var(--color-border-strong);
  color: var(--color-text-muted);
  white-space: nowrap;
}

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

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

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

/* ---------- Async / state messaging ---------- */

.status-message {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.status-message.loading {
  color: var(--color-text-muted);
  background: var(--color-bg-inset);
  border: 1px solid var(--color-border);
}

.status-message.empty {
  color: var(--color-text-muted);
  background: var(--color-bg-inset);
  border: 1px dashed var(--color-border-strong);
}

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

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

/* ---------- Pagination ---------- */

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

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

/* ---------- Utility ---------- */

.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;
}

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

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

@media (max-width: 640px) {
  .app-header {
    padding: var(--space-3) var(--space-4);
  }

  #app {
    padding: var(--space-4);
  }

  .card {
    padding: var(--space-4);
  }
}