:root {
  --primary-color: #0965c9;
  --danger-color: #b42318;
  --success-color: #147342;
  --warning-color: #8a5800;
  --text-primary: #1c1c1e;
  --text-secondary: #566070;
  --bg-primary: #f2f2f7;
  --bg-surface: #ffffff;
  --border-color: #8e8e93;
  --radius: 12px;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #f2f2f7;
    --text-secondary: #aeaeb2;
    --bg-primary: #000000;
    --bg-surface: #1c1c1e;
    --border-color: #38383a;
    --success-color: #67d78b;
    --warning-color: #f8bd60;
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Malgun Gothic", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  padding: 20px;
}

/* Layout */
.container {
  max-width: 1280px;
  margin: 0 auto;
}

.grid {
  display: grid;
  gap: 20px;
}

@media (min-width: 768px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1280px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Cards */
.card {
  background: var(--bg-surface);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.card-header {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Buttons */
.btn {
  background: var(--primary-color);
  color: #fff;
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: opacity 0.2s;
}

.btn:hover {
  opacity: 0.8;
}

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

.btn-secondary {
  background: #566070;
}

.btn:disabled {
  opacity: 1;
  background: var(--bg-primary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  cursor: not-allowed;
}

[hidden] { display: none !important; }
body { word-break: keep-all; overflow-wrap: anywhere; }
h1 { font-size: clamp(1.5rem, 3vw, 2rem); }
h2, h3 { font-size: 1.125rem; }
p + p { margin-top: var(--space-2); }
.page-header { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: var(--space-4); margin-bottom: var(--space-6); }
.page-actions { display: flex; justify-content: flex-end; margin-bottom: var(--space-4); }
#auth-section { max-width: 480px; margin: var(--space-8) auto; }
form, .selection-panel { margin-top: var(--space-4); }
.metric { font-size: 1.5rem; font-weight: 700; margin-bottom: var(--space-2); }
.card-header { gap: var(--space-3); align-items: flex-start; }
.card-header span { font-size: 0.875rem; white-space: nowrap; }
.device-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); }
.device-select { display: flex; gap: var(--space-3); align-items: center; margin-top: var(--space-4); min-height: 48px; }
.device-select input { width: 24px; height: 24px; margin: 0; flex-shrink: 0; accent-color: var(--primary-color); }
.selection-panel { margin-bottom: var(--space-6); }
.selection-panel button { margin-top: var(--space-3); }
.btn, input, select, summary { min-height: 48px; font-size: 1rem; }
.btn { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }
a.btn { margin: var(--space-4) 0; }
label { display: block; }
:focus-visible { outline: 3px solid var(--primary-color); outline-offset: 3px; }
input:user-invalid { border-color: var(--danger-color); }
.pending-info { margin-top: var(--space-4); }
details p { margin-top: var(--space-4); }
summary { cursor: pointer; padding-block: 12px; }
.card > h2 { font-size: 1.2rem; font-weight: 600; margin-bottom: 15px; }
@media (min-width: 768px) { .add-form { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: var(--space-4); align-items: end; } .add-form button { grid-column: 1 / -1; justify-self: start; } }
@media (prefers-color-scheme: dark) { .status-revoked, .error-state { color: #ffaca5; } }
@media (prefers-reduced-motion: reduce) { .btn { transition: none; } }

/* Dialog */
dialog {
  border: none;
  border-radius: var(--radius);
  padding: 20px;
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  width: 90%;
  max-width: 480px;
  margin: auto;
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

input, select {
  font-size: 1rem;
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  margin-top: 5px;
  margin-bottom: 15px;
}

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

.d-none {
  display: none !important;
}

.status-active { color: var(--success-color); }
.status-pending { color: var(--warning-color); }
.status-suspended { color: var(--text-secondary); }
.status-revoked { color: var(--danger-color); }

.mt-4 { margin-top: 20px; }
.mb-2 { margin-bottom: 10px; }

/* Empty / Loading States */
.empty-state, .loading-state, .error-state {
  text-align: center;
  padding: 40px;
  color: var(--text-secondary);
}

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

dialog .error-message { padding: 0; text-align: start; min-height: 1.5em; }
dialog { max-height: calc(100dvh - 32px); overflow-y: auto; }

[data-loading] {
  opacity: 0.6;
  pointer-events: none;
}