/* ── Linux Administration · terminal (black + amber) theme ───────────────── */

:root {
  --tux-amber: #ffb454;
  --tux-amber-deep: #f0883e;
  --tux-amber-dim: #d9772f;
  --tux-green: #3fb950;
  --tux-black: #0a0a0a;
  --tux-surface: #161b22;
  --tux-surface-2: #1c2128;
  --tux-border: #30363d;

  /* Drive Material's primary (header/nav/footer) and accent (links/hover) */
  --md-primary-fg-color: #0a0a0a;
  --md-primary-fg-color--light: #161b22;
  --md-primary-fg-color--dark: #010409;
  --md-accent-fg-color: #f0883e;
}

/* ── Dark (slate) is the primary, terminal-first experience ──────────────── */
[data-md-color-scheme="slate"] {
  --md-hue: 220;
  --md-default-bg-color: #0a0a0a;
  --md-default-bg-color--light: #161b22;
  --md-default-bg-color--lighter: #1c2128;
  --md-default-fg-color: #e6edf3;
  --md-default-fg-color--light: #c9d1d9;
  --md-default-fg-color--lighter: #8b949e;
  --md-default-fg-color--lightest: rgba(139, 148, 158, 0.35);

  --md-primary-fg-color: #0a0a0a;
  --md-primary-fg-color--light: #161b22;
  --md-primary-fg-color--dark: #010409;
  --md-accent-fg-color: #ffb454;

  --md-typeset-a-color: #ffb454;
  --md-code-bg-color: #161b22;
  --md-code-fg-color: #e6edf3;

  --tux-border: #30363d;
}

/* Light mode keeps an amber identity but is the secondary toggle */
[data-md-color-scheme="default"] {
  --md-primary-fg-color: #1c2128;
  --md-primary-fg-color--light: #30363d;
  --md-primary-fg-color--dark: #0a0a0a;
  --md-accent-fg-color: #d9772f;
  --md-typeset-a-color: #b45f16;
}

/* ── Header / tabs: black bar with an amber hairline ─────────────────────── */
.md-header,
.md-tabs {
  box-shadow: none;
  background-color: var(--tux-black);
}
[data-md-color-scheme="default"] .md-header,
[data-md-color-scheme="default"] .md-tabs {
  background-color: #1c2128;
}
.md-header {
  border-bottom: 1px solid var(--tux-border);
}
.md-tabs {
  border-bottom: 3px solid var(--tux-amber);
}

.md-header__title {
  font-weight: 700;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
}

/* the little prompt glyph before the site title */
.md-header__title .md-header__topic:first-child .md-ellipsis::before {
  content: "\276F  ";
  color: var(--tux-amber);
  font-weight: 700;
}

/* ── Typography ──────────────────────────────────────────────────────────── */
.md-typeset h1,
.md-typeset h2 {
  font-weight: 800;
  letter-spacing: 0;
}

.md-typeset h1 {
  margin-bottom: 0.9rem;
  color: var(--tux-amber);
}

.md-typeset h2 {
  border-bottom: 2px solid var(--tux-amber);
  padding-bottom: 0.35rem;
}

.md-typeset h3 {
  color: var(--md-default-fg-color--light);
}

/* headings get a subtle monospace prompt accent */
.md-typeset h2::before {
  content: "$ ";
  color: var(--tux-green);
  font-family: "JetBrains Mono", ui-monospace, Consolas, monospace;
  font-weight: 700;
}

/* ── Tables ──────────────────────────────────────────────────────────────── */
.md-typeset table:not([class]) {
  border: 1px solid var(--tux-border);
  border-radius: 0.4rem;
  overflow: hidden;
}

.md-typeset table:not([class]) th {
  background: var(--tux-surface-2);
  color: var(--tux-amber);
  font-weight: 700;
  border-bottom: 2px solid var(--tux-amber);
}

/* ── Code: give it a real terminal feel ──────────────────────────────────── */
.md-typeset code {
  border-radius: 0.25rem;
}

.md-typeset pre > code {
  border: 1px solid var(--tux-border);
}

[data-md-color-scheme="slate"] .md-typeset code {
  color: var(--tux-amber);
  background-color: rgba(255, 180, 84, 0.1);
}

[data-md-color-scheme="slate"] .md-typeset pre > code {
  color: #e6edf3;
  background-color: #161b22;
}

/* ── Admonitions / details / blockquotes ─────────────────────────────────── */
.md-typeset .admonition,
.md-typeset details {
  border-radius: 0.45rem;
}

.md-typeset blockquote {
  border-left: 0.2rem solid var(--tux-amber);
}

/* ── Home hero cards ─────────────────────────────────────────────────────── */
.tux-hero-grid {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  margin: 1.5rem 0 2rem;
}

.md-typeset .tux-card {
  align-items: center;
  background: var(--tux-surface);
  border: 1px solid var(--tux-border);
  border-left: 0.35rem solid var(--tux-amber);
  border-radius: 0.5rem;
  color: var(--md-default-fg-color);
  display: flex;
  font-family: "JetBrains Mono", ui-monospace, Consolas, monospace;
  font-size: 1rem;
  font-weight: 700;
  gap: 0.55rem;
  min-height: 5rem;
  padding: 1rem;
  text-decoration: none;
  transition: border-color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
}

[data-md-color-scheme="default"] .md-typeset .tux-card {
  background: #f6f8fa;
}

.md-typeset .tux-card:hover {
  border-color: var(--tux-amber);
  box-shadow: 0 0.55rem 1.4rem rgba(240, 136, 62, 0.25);
  transform: translateY(-2px);
}

.md-typeset .tux-card-notes {
  border-left-color: var(--tux-amber);
}
.md-typeset .tux-card-exercises {
  border-left-color: var(--tux-amber-deep);
}
.md-typeset .tux-card-quiz {
  border-left-color: var(--tux-green);
}
.md-typeset .tux-card-projects {
  border-left-color: var(--tux-amber-dim);
}
.md-typeset .tux-card-resources {
  border-left-color: #8b949e;
}

/* ── Nav / footer polish ─────────────────────────────────────────────────── */
.md-nav__item .md-nav__link--active {
  font-weight: 700;
  color: var(--tux-amber);
}

.md-footer {
  margin-top: 2rem;
  background-color: var(--tux-black);
}
[data-md-color-scheme="default"] .md-footer {
  background-color: #1c2128;
}
.md-footer-meta {
  background-color: #010409;
}

@media screen and (max-width: 44.9375em) {
  .tux-hero-grid {
    grid-template-columns: 1fr;
  }
  .md-typeset .tux-card {
    min-height: 4.25rem;
  }
}
/* Learning resource hub navigation: right rail */
.resource-sidebar-hub {
  border-top: 1px solid var(--md-default-fg-color--lightest);
  display: flex;
  flex-direction: column;
  gap: 0.42rem;
  margin-top: 1rem;
  padding-top: 0.85rem;
}

.resource-sidebar-hub__title {
  color: var(--md-default-fg-color--light);
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.2;
  margin-bottom: 0.1rem;
  text-transform: uppercase;
}

.resource-sidebar-hub__button {
  align-items: center;
  border: 1px solid var(--course-hub-color, var(--md-primary-fg-color));
  border-radius: 0.45rem;
  color: var(--course-hub-color, var(--md-primary-fg-color));
  display: flex;
  font-size: 0.68rem;
  font-weight: 800;
  justify-content: space-between;
  line-height: 1.25;
  padding: 0.42rem 0.5rem;
  text-decoration: none;
  transition: background-color 150ms ease, box-shadow 150ms ease, transform 150ms ease;
}

.resource-sidebar-hub__button::after {
  content: "\2192";
  flex-shrink: 0;
  font-weight: 900;
  margin-left: 0.45rem;
}

.resource-sidebar-hub__button:hover {
  background-color: color-mix(in srgb, var(--course-hub-color, var(--md-primary-fg-color)) 10%, transparent);
  box-shadow: 0 0.25rem 0.65rem color-mix(in srgb, var(--course-hub-color, var(--md-primary-fg-color)) 15%, transparent);
  text-decoration: none;
  transform: translateY(-1px);
}

.resource-sidebar-hub__home { --course-hub-color: var(--md-accent-fg-color); }
.resource-sidebar-hub__dsai { --course-hub-color: #34526b; }
.resource-sidebar-hub__cyber { --course-hub-color: #b4122e; }