:root {
  color-scheme: light;

  --app-bg: #f3f6fb;
  --surface-1: #ffffff;
  --surface-2: #f8fafc;
  --surface-3: #eef3f9;
  --ink-strong: #111827;
  --ink-muted: #4b5563;
  --ink-subtle: #6b7280;
  --border-soft: #dbe3ef;
  --border-strong: #c8d4e4;
  --brand-500: #1757d0;
  --brand-600: #1145ab;
  --brand-soft: #e7efff;
  --success-soft: #e6f8ef;
  --success-strong: #0f7a3d;
  --warning-soft: #fff5de;
  --warning-strong: #916215;
  --danger-soft: #fdebed;
  --danger-strong: #af2335;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 2.5rem;

  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-pill: 9999px;

  --shadow-sm: 0 1px 2px rgb(15 23 42 / 0.06);
  --shadow-md: 0 12px 24px rgb(15 23 42 / 0.08);

  --motion-fast: 160ms;
  --motion-normal: 260ms;
  --ease-standard: cubic-bezier(0.2, 0.8, 0.2, 1);
}

html {
  font-size: 16px;
  height: 100%;
}

body {
  min-height: 100%;
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Roboto", sans-serif;
  background: linear-gradient(180deg, #f8fbff 0%, var(--app-bg) 35%, var(--app-bg) 100%);
  color: var(--ink-strong);
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--brand-500);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  color: var(--brand-600);
  text-decoration: underline;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--brand-500) 45%, white 55%);
  outline-offset: 2px;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.app-topbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border-soft);
  background: rgb(255 255 255 / 0.88);
  backdrop-filter: blur(12px);
}

.app-topbar__inner,
.app-main,
.app-footer__inner {
  width: min(1200px, 92vw);
  margin-inline: auto;
}

.app-topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) 0;
}

.app-brand {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-strong);
  white-space: nowrap;
}

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

.app-nav__link {
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius-pill);
  color: var(--ink-muted);
  font-weight: 500;
  transition: color var(--motion-fast) var(--ease-standard),
    background-color var(--motion-fast) var(--ease-standard);
}

.app-nav__link:hover,
.app-nav__link:focus-visible {
  color: var(--ink-strong);
  background: var(--surface-3);
  text-decoration: none;
}

.app-nav__link--active {
  color: var(--brand-600);
  background: var(--brand-soft);
}

.app-main {
  padding: var(--space-6) 0;
}

.app-footer {
  border-top: 1px solid var(--border-soft);
  background: rgb(255 255 255 / 0.7);
}

.app-footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) 0 var(--space-5);
  color: var(--ink-subtle);
  font-size: 0.9rem;
}

.page-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.page-title {
  margin: 0;
  font-size: clamp(1.5rem, 2vw + 1rem, 2rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-subtitle {
  margin: var(--space-2) 0 0;
  color: var(--ink-muted);
  max-width: 72ch;
}

.app-card {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  background: var(--surface-1);
  box-shadow: var(--shadow-sm);
}

.app-card__body {
  padding: var(--space-5);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: var(--space-4);
}

.metric {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  background: var(--surface-2);
  padding: var(--space-4);
}

.metric__label {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--ink-subtle);
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.metric__value {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.25;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 7.2rem;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.status-badge--active {
  background: var(--success-soft);
  color: var(--success-strong);
}

.status-badge--stale,
.status-badge--reserved {
  background: var(--warning-soft);
  color: var(--warning-strong);
}

.status-badge--retired {
  background: var(--danger-soft);
  color: var(--danger-strong);
}

.status-badge--stock {
  background: var(--surface-3);
  color: var(--ink-muted);
}

.app-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  padding: 0.55rem 1rem;
  font-weight: 600;
  transition: background-color var(--motion-fast) var(--ease-standard),
    border-color var(--motion-fast) var(--ease-standard),
    color var(--motion-fast) var(--ease-standard),
    transform var(--motion-fast) var(--ease-standard);
}

.app-button:active {
  transform: translateY(1px);
}

.app-button--primary {
  background: var(--brand-500);
  border-color: var(--brand-500);
  color: #fff;
}

.app-button--primary:hover,
.app-button--primary:focus-visible {
  background: var(--brand-600);
  border-color: var(--brand-600);
  color: #fff;
  text-decoration: none;
}

.app-button--ghost {
  background: var(--surface-1);
  border-color: var(--border-strong);
  color: var(--ink-strong);
}

.app-button--ghost:hover,
.app-button--ghost:focus-visible {
  background: var(--surface-3);
  text-decoration: none;
}

.app-button.disabled,
.app-button[aria-disabled="true"] {
  pointer-events: none;
  opacity: 0.45;
}

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

.app-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
  background: var(--surface-1);
}

.app-table th,
.app-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-soft);
  vertical-align: middle;
}

.app-table th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--surface-2);
  color: var(--ink-subtle);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.app-table tbody tr {
  transition: background-color var(--motion-fast) var(--ease-standard);
}

.app-table tbody tr:hover {
  background: #f8fbff;
}

.app-empty-state {
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  text-align: center;
  background: var(--surface-2);
  color: var(--ink-muted);
}

.app-surface-muted {
  background: var(--surface-2);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100%;
  z-index: 2000;
  border-radius: var(--radius-pill);
  background: var(--brand-600);
  color: white;
  padding: 0.5rem 0.85rem;
  transition: top var(--motion-fast) var(--ease-standard);
}

.skip-link:focus {
  top: var(--space-4);
  color: white;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 768px) {
  .app-main {
    padding: var(--space-5) 0;
  }

  .app-topbar__inner {
    flex-wrap: wrap;
  }
}