:root {
  color-scheme: light dark;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --radius: 0.5rem;
  --touch-target: 2.75rem;
  --surface: #ffffff;
  --surface-muted: #f4f6f9;
  --surface-raised: #ffffff;
  --border: #d3dae3;
  --text: #121a24;
  --text-muted: #4d5b6b;
  --accent: #0b5cab;
  --accent-contrast: #ffffff;
  --focus: #0b5cab;
  --tone-neutral-bg: #eceff3;
  --tone-neutral-fg: #38424f;
  --tone-info-bg: #e2edfa;
  --tone-info-fg: #0b4a86;
  --tone-progress-bg: #e6e9fb;
  --tone-progress-fg: #333d94;
  --tone-success-bg: #e2f3e8;
  --tone-success-fg: #1d6b3c;
  --tone-warning-bg: #fbf0d9;
  --tone-warning-fg: #7a4d05;
  --tone-danger-bg: #fae3e3;
  --tone-danger-fg: #8c1f1f;
  --font: "Segoe UI", "Inter", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface: #121821;
    --surface-muted: #0c1119;
    --surface-raised: #1a2230;
    --border: #2c3747;
    --text: #eef2f7;
    --text-muted: #a8b4c3;
    --accent: #5aa9ff;
    --accent-contrast: #08121e;
    --focus: #8cc4ff;
    --tone-neutral-bg: #212b38;
    --tone-neutral-fg: #cbd5e1;
    --tone-info-bg: #16304c;
    --tone-info-fg: #a9d1f7;
    --tone-progress-bg: #232a5c;
    --tone-progress-fg: #bcc3f7;
    --tone-success-bg: #16341f;
    --tone-success-fg: #a6dcb9;
    --tone-warning-bg: #3d2f11;
    --tone-warning-fg: #f0ce88;
    --tone-danger-bg: #3f1a1a;
    --tone-danger-fg: #f3b1b1;
  }
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.45;
  color: var(--text);
  background: var(--surface-muted);
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent); }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -4rem;
  z-index: 20;
  padding: var(--space-2) var(--space-4);
  background: var(--accent);
  color: var(--accent-contrast);
  border-radius: var(--radius);
  transition: top 120ms ease-in-out;
}

.skip-link:focus { top: var(--space-2); }

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

.shell__header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-5);
  padding: var(--space-3) var(--space-4);
  background: var(--surface-raised);
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; flex-direction: column; margin-inline-end: auto; }
.brand__name { font-weight: 700; font-size: 1.1rem; letter-spacing: 0.01em; }
.brand__tagline { color: var(--text-muted); font-size: 0.8rem; }

.context { display: flex; flex-wrap: wrap; gap: var(--space-4); align-items: center; }
.context__item { display: flex; flex-direction: column; font-size: 0.85rem; min-width: 8rem; }
.context__label { color: var(--text-muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; }
.context__value { font-weight: 600; }

.switcher { display: flex; flex-direction: column; gap: var(--space-1); }
.switcher__list { display: flex; flex-wrap: wrap; gap: var(--space-2); list-style: none; margin: 0; padding: 0; }
.switcher__link {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-target);
  padding: 0 var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-size: 0.85rem;
}
.switcher__link[aria-current="true"] {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: transparent;
  font-weight: 600;
}

.banner {
  margin: 0;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
}
.banner--warning { background: var(--tone-warning-bg); color: var(--tone-warning-fg); }
.banner--info { background: var(--tone-info-bg); color: var(--tone-info-fg); font-weight: 400; }

.shell__body { display: block; }

.shell__nav {
  background: var(--surface-raised);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  padding: var(--space-2) var(--space-3);
}

.nav__group { margin: 0 0 var(--space-3); }
.nav__group:last-child { margin-bottom: 0; }
.nav__group-title {
  margin: 0 0 var(--space-1);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}
.nav__list { display: flex; gap: var(--space-2); list-style: none; margin: 0; padding: 0; }
.nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--touch-target);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
  border: 1px solid transparent;
  text-decoration: none;
  color: var(--text);
  white-space: nowrap;
}
.nav__link:hover { background: var(--surface-muted); }
.nav__link[aria-current="page"] {
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}
.nav__glyph { font-size: 1rem; line-height: 1; }
.nav__empty { color: var(--text-muted); margin: 0; padding: var(--space-2); }

.shell__main {
  padding: var(--space-5) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  max-width: 90rem;
  width: 100%;
}

.page__header { display: flex; flex-direction: column; gap: var(--space-2); }
.page__title { margin: 0; font-size: 1.5rem; }
.page__description { margin: 0; color: var(--text-muted); max-width: 60ch; }
.page__meta { display: flex; flex-wrap: wrap; gap: var(--space-3); font-size: 0.85rem; color: var(--text-muted); }

.breadcrumb { font-size: 0.85rem; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: var(--space-2); list-style: none; margin: 0; padding: 0; }
.breadcrumb li::after { content: "/"; margin-inline-start: var(--space-2); color: var(--text-muted); }
.breadcrumb li:last-child::after { content: ""; }

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

.card-grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr));
  list-style: none;
  margin: 0;
  padding: 0;
}

.tile { display: flex; flex-direction: column; gap: var(--space-1); text-decoration: none; color: inherit; }
.tile__value { font-size: 1.9rem; font-weight: 700; line-height: 1.1; }
.tile__label { color: var(--text-muted); font-size: 0.9rem; }
.tile--danger .tile__value { color: var(--tone-danger-fg); }

.filters { border: 1px solid var(--border); border-radius: var(--radius); padding: var(--space-3); background: var(--surface-raised); }
.filters__legend { font-weight: 600; padding-inline: var(--space-2); }
.filters__list { display: flex; flex-wrap: wrap; gap: var(--space-2); list-style: none; margin: 0; padding: 0; }
.filters__link {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-target);
  padding: 0 var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  background: var(--surface);
}
.filters__link[aria-current="true"] { background: var(--accent); color: var(--accent-contrast); border-color: transparent; font-weight: 600; }

.table-wrapper { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface-raised); }
table.data-table { border-collapse: collapse; width: 100%; min-width: 42rem; }
.data-table caption { text-align: start; padding: var(--space-3) var(--space-4); font-weight: 600; }
.data-table th, .data-table td { padding: var(--space-3) var(--space-4); text-align: start; border-top: 1px solid var(--border); vertical-align: top; }
.data-table thead th { position: sticky; top: 0; background: var(--surface-muted); font-size: 0.85rem; }
.data-table td.numeric, .data-table th.numeric { text-align: end; font-variant-numeric: tabular-nums; }
.data-table tbody tr:hover { background: var(--surface-muted); }

.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
}
.badge--neutral { background: var(--tone-neutral-bg); color: var(--tone-neutral-fg); }
.badge--info { background: var(--tone-info-bg); color: var(--tone-info-fg); }
.badge--progress { background: var(--tone-progress-bg); color: var(--tone-progress-fg); }
.badge--success { background: var(--tone-success-bg); color: var(--tone-success-fg); }
.badge--warning { background: var(--tone-warning-bg); color: var(--tone-warning-fg); }
.badge--danger { background: var(--tone-danger-bg); color: var(--tone-danger-fg); }

.state { display: flex; flex-direction: column; align-items: flex-start; gap: var(--space-3); }
.state__title { margin: 0; font-size: 1.15rem; }
.state__description { margin: 0; color: var(--text-muted); max-width: 55ch; }
.state__action {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch-target);
  padding: 0 var(--space-4);
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-contrast);
  text-decoration: none;
  font-weight: 600;
}
.state__code { font-family: ui-monospace, "SFMono-Regular", Menlo, monospace; font-size: 0.85rem; color: var(--text-muted); }

.skeleton { display: grid; gap: var(--space-2); width: 100%; }
.skeleton__bar { height: 1rem; border-radius: var(--radius); background: var(--tone-neutral-bg); }
.skeleton__bar--wide { width: 100%; }
.skeleton__bar--medium { width: 70%; }
.skeleton__bar--narrow { width: 45%; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.shell__footer {
  padding: var(--space-4);
  border-top: 1px solid var(--border);
  background: var(--surface-raised);
  color: var(--text-muted);
  font-size: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

@media (min-width: 60rem) {
  .shell { grid-template-rows: auto auto 1fr auto; }
  .shell__body { display: grid; grid-template-columns: 17rem 1fr; align-items: start; }
  .shell__nav {
    border-bottom: none;
    border-inline-end: 1px solid var(--border);
    overflow-x: visible;
    padding: var(--space-4);
    position: sticky;
    top: 0;
    height: 100%;
  }
  .nav__list { flex-direction: column; gap: var(--space-1); }
  .nav__link { white-space: normal; }
  .shell__main { padding: var(--space-6); }
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0ms !important; animation-duration: 0ms !important; }
}

@media print {
  .shell__nav, .skip-link, .filters, .switcher { display: none; }
  .shell__body { display: block; }
  body { background: #ffffff; }
}