:root {
  --bg: #faf8f4;
  --fg: #0d0c10;
  --muted: #534f5a;
  --border: #e3dfd6;
  --surface: #f5f2ed;
  --surface-hover: #f4f1eb;
  --accent: #4a3ad1;
  --accent-contrast: #ffffff;
  --sidebar-bg: #0d0c10;
  --sidebar-fg: #faf8f4;
  --sidebar-muted: #aaa4b2;
  --sidebar-link: #d8d4de;
  --sidebar-active-bg: #1c1a22;
  --sidebar-accent: #b7acff;
  --font-body: "Inter", Helvetica, "Helvetica Neue", sans-serif;
  --font-display: "Space Grotesk", Helvetica, "Helvetica Neue", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121014;
    --fg: #f4f1ec;
    --muted: #aaa4b2;
    --border: #2b2830;
    --surface: #1c1a20;
    --surface-hover: #211f26;
    --accent: #b7acff;
    --accent-contrast: #14121a;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
}

::selection {
  background: var(--accent);
  color: var(--accent-contrast);
}

a {
  color: var(--fg);
  text-underline-offset: 0.14em;
}

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
.table-scroll:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

[hidden] {
  display: none !important;
}

.sidebar :focus-visible {
  outline-color: var(--sidebar-accent);
}

.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: 12px;
  top: 12px;
  z-index: 20;
  padding: 8px 12px;
  border-radius: 4px;
  background: var(--bg);
  color: var(--fg);
  box-shadow: 0 0 0 1px var(--border);
}

.shell {
  display: flex;
  min-height: 100vh;
  align-items: stretch;
}

/* Sidebar */

.sidebar {
  position: sticky;
  top: 0;
  flex: 0 0 264px;
  width: 264px;
  height: 100vh;
  padding: 30px 20px 24px;
  overflow: auto;
  background: var(--sidebar-bg);
  color: var(--sidebar-fg);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 34px;
  color: var(--sidebar-fg);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  text-decoration: none;
}

.brand-mark {
  flex: 0 0 22px;
  width: 22px;
  height: 22px;
}

.brand-mark .bar {
  fill: var(--sidebar-fg);
}

.brand-mark .bar:last-child {
  fill: var(--sidebar-accent);
}

.brand:hover,
.sidebar-foot:hover,
.track-link:hover {
  color: var(--sidebar-fg);
}

.sidebar-kicker {
  margin: 0 0 10px 2px;
  color: var(--sidebar-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.track-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.track-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-radius: 6px;
  color: var(--sidebar-link);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background-color 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}

.track-num {
  flex: 0 0 auto;
  color: var(--sidebar-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
}

.track-link.is-current {
  background: var(--sidebar-active-bg);
  color: var(--sidebar-fg);
  font-weight: 700;
  border-left-color: var(--sidebar-accent);
}

.track-link.is-current .track-num {
  color: var(--sidebar-accent);
}

.sidebar-foot {
  display: block;
  margin-top: 30px;
  padding: 9px 10px;
  border-radius: 6px;
  color: var(--sidebar-muted);
  font-size: 13px;
  text-decoration: none;
  transition: background-color 0.12s ease, color 0.12s ease;
}

.sidebar-foot.is-current {
  background: var(--sidebar-active-bg);
  color: var(--sidebar-fg);
  font-weight: 700;
}

/* Header */

.pane {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 40px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--fg);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: color 0.12s ease;
}

.back svg {
  width: 14px;
  height: 14px;
}

.back:hover {
  color: var(--accent);
}

.top-note {
  color: var(--muted);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
}

.top-links {
  display: flex;
  align-items: center;
  gap: 10px;
}

.top-github,
.top-star {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}

.top-github svg,
.top-star svg {
  width: 14px;
  height: 14px;
}

.top-github {
  color: var(--muted);
  border: 1px solid transparent;
}

.top-github:hover {
  color: var(--fg);
  border-color: var(--border);
}

.top-star {
  color: var(--accent);
  border: 1px solid var(--accent);
}

.top-star:hover {
  background: var(--accent);
  color: var(--accent-contrast);
}

/* Page */

.page {
  flex: 1 1 auto;
  max-width: 880px;
  padding: 44px 40px 80px;
  width: 100%;
  min-width: 0;
  overflow-wrap: anywhere;
  overflow-x: auto;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.page h1 .badge {
  display: inline-block;
  margin-left: 10px;
  vertical-align: middle;
}

.page h1 .badge img {
  display: inline-block;
  height: 20px;
}

.page h2 {
  margin: 36px 0 14px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.page p,
.page li {
  max-width: 64ch;
}

.page ul,
.page ol {
  padding-left: 1.2em;
}

.page hr {
  margin: 30px 0;
  border: 0;
  border-top: 1px solid var(--border);
}

.page code {
  padding: 0.15em 0.45em;
  border-radius: 4px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.85em;
}

/* Homepage hero */

.is-home > p:first-of-type {
  max-width: 62ch;
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.6;
}

/* Track meta block: Goal, Prereqs, Status paragraphs right after h1 */

.is-track h1 + p {
  margin: 0 0 4px;
  color: var(--fg);
  font-size: 16px;
}

.is-track h1 + p + p {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 14px;
}

.is-track h1 + p + p + p {
  display: inline-block;
  margin: 0 0 26px;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--surface);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Tables */

.page table {
  width: 100%;
  margin: 18px 0 34px;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.45;
}

.page th,
.page td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.page th {
  background: var(--surface);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page tr:hover td {
  background: var(--surface-hover);
}

.page td strong a {
  color: var(--accent);
}

.page img {
  max-width: 100%;
  vertical-align: middle;
}

.table-scroll {
  overflow-x: auto;
  margin: 18px 0 34px;
}

.table-scroll table {
  margin: 0;
}

.is-track table {
  min-width: 620px;
}

.is-track table th:first-child {
  min-width: 64px;
  white-space: nowrap;
}

.page pre {
  overflow-x: auto;
  padding: 16px;
  background: var(--surface);
}

.catalog-search {
  margin-top: 18px;
}

.catalog-search label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.search-controls {
  display: flex;
  gap: 8px;
}

.search-controls input,
.search-controls button {
  min-height: 44px;
  border: 1px solid var(--muted);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  font: inherit;
  padding: 10px 12px;
}

.search-controls input {
  flex: 1;
  min-width: 0;
  width: 100%;
}

.search-controls input::placeholder {
  color: var(--muted);
  opacity: 1;
}

.search-controls button {
  cursor: pointer;
}

.search-controls button:hover {
  background: var(--surface-hover);
}

#search-status,
.track-help {
  color: var(--muted);
  font-size: 14px;
}

.nav-toggle {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--sidebar-muted);
  border-radius: 6px;
  background: var(--sidebar-active-bg);
  color: var(--sidebar-fg);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.nav-toggle::after {
  content: '+';
  float: right;
}

.nav-toggle[aria-expanded="true"]::after {
  content: '−';
}

.is-home table tr:hover td:first-child {
  box-shadow: inset 3px 0 0 var(--accent);
}

.is-track table tbody td:first-child {
  width: 1%;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  color: var(--accent);
  text-align: center;
  background: var(--surface);
}

@media (max-width: 800px) {
  .sidebar {
    position: relative;
    width: auto;
    height: auto;
    padding: 20px;
    border-bottom: 1px solid var(--sidebar-active-bg);
  }

  .brand {
    margin-bottom: 18px;
  }

  #track-menu {
    margin-top: 18px;
  }

  .shell {
    display: block;
  }

  .track-nav {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .track-link {
    padding: 10px 12px;
  }

  .sidebar-foot {
    margin-top: 14px;
  }

  .top,
  .page {
    padding-left: 20px;
    padding-right: 20px;
  }

  .page h1 {
    font-size: 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
  }
}

@media print {
  :root {
    --bg: #ffffff;
    --fg: #0d0c10;
    --muted: #534f5a;
    --surface: #ffffff;
    --surface-hover: #ffffff;
    --accent: #4a3ad1;
  }

  .sidebar,
  .top,
  .skip,
  .catalog-search,
  .track-help {
    display: none;
  }

  .shell {
    display: block;
  }

  .page {
    max-width: none;
    padding: 0;
    overflow: visible;
  }

  .table-scroll {
    overflow: visible;
  }

  .is-track table {
    min-width: 0;
  }

  .page tr[hidden] {
    display: table-row !important;
  }

  a {
    color: var(--fg);
    text-decoration: underline;
  }
}