:root {
  color-scheme: dark;

  --color-bg: #0f1115;
  --color-bg-elevated: #171a21;
  --color-bg-elevated-2: #1e222b;
  --color-border: #2a2f3a;
  --color-border-strong: #3a4152;

  --color-text: #e6e9f0;
  --color-text-muted: #a7adba;
  --color-text-dim: #7a8090;

  --color-primary: #5b8def;
  --color-primary-hover: #7aa2f2;
  --color-primary-text: #0b1220;

  --color-success: #3fbf7f;
  --color-success-bg: rgba(63, 191, 127, 0.12);
  --color-warning: #e0a63f;
  --color-warning-bg: rgba(224, 166, 63, 0.12);
  --color-danger: #e0635f;
  --color-danger-bg: rgba(224, 99, 95, 0.12);
  --color-info: #5b8def;
  --color-info-bg: rgba(91, 141, 239, 0.12);

  --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, Menlo, Consolas, monospace;

  --shadow-1: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-2: 0 4px 16px rgba(0, 0, 0, 0.5);

  --focus-ring: 0 0 0 3px rgba(91, 141, 239, 0.45);
}

*,
*::before,
*::after {
  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, h5, h6 {
  margin: 0 0 var(--space-3) 0;
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-text);
}

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

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

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

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

*:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

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

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

.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;
}

.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-sm);
  font-weight: 500;
}

.app-nav a:hover {
  color: var(--color-text);
  background: var(--color-bg-elevated-2);
  text-decoration: none;
}

.app-nav a.active {
  color: var(--color-primary-text);
  background: var(--color-primary);
}

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

.app-user {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  white-space: nowrap;
}

#app-root {
  flex: 1;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-5);
}

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

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.page-header p {
  margin: 0;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

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

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

/* ---------- Cards / panels ---------- */

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

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

.grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

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

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
}

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

.form-field .hint {
  font-size: 0.78rem;
  color: var(--color-text-dim);
}

input[type='text'],
input[type='email'],
input[type='password'],
input[type='number'],
input[type='date'],
input[type='datetime-local'],
input[type='search'],
select,
textarea {
  background: var(--color-bg);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  padding: var(--space-2) var(--space-3);
  min-height: 38px;
  width: 100%;
}

textarea {
  min-height: 90px;
  resize: vertical;
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--focus-ring);
}

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);
  margin: 0 0 var(--space-4) 0;
}

fieldset legend {
  padding: 0 var(--space-2);
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: 0.85rem;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1px solid var(--color-border-strong);
  background: var(--color-bg-elevated-2);
  color: var(--color-text);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  min-height: 38px;
  line-height: 1;
}

.btn:hover {
  border-color: var(--color-text-dim);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

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

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

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

.btn-danger:hover {
  background: var(--color-danger-bg);
}

.btn-small {
  min-height: 30px;
  padding: var(--space-1) var(--space-3);
  font-size: 0.82rem;
}

.btn-link {
  background: none;
  border: none;
  color: var(--color-primary);
  padding: 0;
  min-height: auto;
  font-weight: 600;
  cursor: pointer;
}

.btn-link:hover {
  text-decoration: underline;
}

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

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

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

thead th {
  text-align: left;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-dim);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-elevated-2);
  white-space: nowrap;
}

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

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

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

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

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-2);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: capitalize;
  white-space: nowrap;
}

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

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

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

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

.badge-neutral {
  background: var(--color-bg-elevated-2);
  color: var(--color-text-muted);
}

/* ---------- State messaging ---------- */

.state-message {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-5);
  border-radius: var(--radius-md);
  border: 1px dashed var(--color-border-strong);
  color: var(--color-text-muted);
}

.state-message.is-error {
  border-color: var(--color-danger);
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.state-message.is-loading {
  border-style: solid;
  border-color: var(--color-border);
}

.form-error {
  color: var(--color-danger);
  font-size: 0.85rem;
  margin: 0 0 var(--space-3) 0;
}

.form-status[aria-live] {
  min-height: 1.2em;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ---------- Modal / dialog ---------- */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: var(--space-6) var(--space-4);
  z-index: 50;
  overflow-y: auto;
}

.modal {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-2);
}

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

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

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

.center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-wrap {
  min-height: calc(100vh - 120px);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

@media (max-width: 720px) {
  .app-header {
    flex-wrap: wrap;
  }

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

  .page-header {
    flex-direction: column;
  }
}