/* Linux Training Course — visual system layered on MkDocs Material */

:root {
  --course-green: #0f8a68;
  --course-green-bright: #19b886;
  --course-amber: #e9822b;
  --course-radius-sm: 0.35rem;
  --course-radius: 0.65rem;
  --course-radius-lg: 1rem;
  --course-border-width: 1px;
  --course-reading-width: 46rem;
  --course-ease: 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

[data-md-color-scheme="default"] {
  --md-primary-fg-color: #102521;
  --md-primary-fg-color--light: #173c34;
  --md-primary-fg-color--dark: #091713;
  --md-accent-fg-color: var(--course-green);
  --md-typeset-a-color: #08775b;

  --course-page: #f4f7f6;
  --course-surface: #ffffff;
  --course-surface-soft: #edf3f1;
  --course-surface-code: #f4f7f6;
  --course-ink: #14211e;
  --course-muted: #63716d;
  --course-border: rgba(20, 49, 42, 0.12);
  --course-border-strong: rgba(20, 49, 42, 0.22);
  --course-grid: rgba(15, 138, 104, 0.075);
  --course-shadow-sm: 0 1px 2px rgba(14, 34, 29, 0.05);
  --course-shadow: 0 12px 36px rgba(14, 34, 29, 0.09);
  --course-header-shadow: 0 1px 0 rgba(255, 255, 255, 0.07),
    0 8px 32px rgba(5, 19, 16, 0.16);
}

[data-md-color-scheme="slate"] {
  --md-primary-fg-color: #0b1715;
  --md-primary-fg-color--light: #132a25;
  --md-primary-fg-color--dark: #07100e;
  --md-accent-fg-color: #27d3a0;
  --md-typeset-a-color: #51d9b1;
  --md-default-bg-color: #0e1615;
  --md-default-bg-color--light: #111c1a;
  --md-default-bg-color--lighter: #16221f;
  --md-default-bg-color--lightest: #1a2825;

  --course-page: #0e1615;
  --course-surface: #141f1d;
  --course-surface-soft: #192724;
  --course-surface-code: #0d1514;
  --course-ink: #e4eeeb;
  --course-muted: #93a7a1;
  --course-border: rgba(173, 224, 208, 0.1);
  --course-border-strong: rgba(173, 224, 208, 0.19);
  --course-grid: rgba(39, 211, 160, 0.065);
  --course-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
  --course-shadow: 0 16px 42px rgba(0, 0, 0, 0.3);
  --course-header-shadow: 0 1px 0 rgba(255, 255, 255, 0.04),
    0 10px 34px rgba(0, 0, 0, 0.35);
}

/* Page chrome */

body {
  background-color: var(--course-page);
  background-image: radial-gradient(
    circle at 50% 0,
    color-mix(in srgb, var(--md-accent-fg-color) 5%, transparent),
    transparent 30rem
  );
}

.md-header {
  background: linear-gradient(110deg, var(--md-primary-fg-color--dark), var(--md-primary-fg-color));
  box-shadow: var(--course-header-shadow);
}

.md-header__title {
  font-weight: 700;
  letter-spacing: -0.015em;
}

.md-logo svg {
  color: var(--course-green-bright);
}

.md-tabs {
  background-color: var(--md-primary-fg-color--dark);
}

.md-search__form {
  border: var(--course-border-width) solid rgba(255, 255, 255, 0.09);
  border-radius: var(--course-radius);
}

.md-search__output {
  border-radius: 0 0 var(--course-radius) var(--course-radius);
}

.md-main__inner {
  margin-top: 1.8rem;
}

.md-content {
  min-width: 0;
}

.md-content__inner {
  padding-bottom: 3rem;
}

.md-sidebar__scrollwrap {
  scrollbar-width: thin;
  scrollbar-color: var(--course-border-strong) transparent;
}

.md-nav__title {
  color: var(--course-muted);
  font-size: 0.63rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.md-nav__link {
  border-radius: var(--course-radius-sm);
  line-height: 1.35;
  transition: background-color var(--course-ease), color var(--course-ease),
    transform var(--course-ease);
}

.md-nav__link:hover {
  transform: translateX(0.12rem);
}

.md-nav__item .md-nav__link--active {
  padding: 0.45rem 0.55rem;
  color: var(--md-accent-fg-color);
  background: color-mix(in srgb, var(--md-accent-fg-color) 9%, transparent);
  box-shadow: inset 2px 0 var(--md-accent-fg-color);
}

.md-sidebar--secondary .md-nav {
  border-left: var(--course-border-width) solid var(--course-border);
  padding-left: 0.6rem;
}

/* Technical reading typography */

.md-typeset {
  color: var(--course-ink);
  font-size: 0.79rem;
  line-height: 1.75;
}

.md-typeset > :not(.intro):not(.syllabus-grid) {
  max-width: var(--course-reading-width);
}

.md-typeset h1,
.md-typeset h2,
.md-typeset h3,
.md-typeset h4 {
  color: var(--course-ink);
  font-weight: 750;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.md-typeset h1 {
  position: relative;
  margin: 0 0 1.7rem;
  padding-bottom: 0.8rem;
  font-size: clamp(1.85rem, 4vw, 2.55rem);
  line-height: 1.12;
}

.md-typeset h1::after {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 4rem;
  height: 0.2rem;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--md-accent-fg-color), var(--course-amber));
  content: "";
}

.md-typeset h2 {
  margin: 2.8rem 0 1rem;
  padding-top: 1rem;
  border-top: var(--course-border-width) solid var(--course-border);
  font-size: 1.35rem;
}

.md-typeset h3 {
  margin: 2.1rem 0 0.65rem;
  font-size: 1.05rem;
}

.md-typeset h4 {
  margin-top: 1.6rem;
  color: var(--md-accent-fg-color);
}

.md-typeset p,
.md-typeset ul,
.md-typeset ol {
  text-wrap: pretty;
}

.md-typeset a {
  font-weight: 550;
  text-decoration-color: color-mix(in srgb, currentColor 40%, transparent);
  text-decoration-thickness: 0.06em;
  text-underline-offset: 0.17em;
  transition: color var(--course-ease), text-decoration-color var(--course-ease);
}

.md-typeset a:hover {
  text-decoration-color: currentColor;
}

.md-typeset :is(ul, ol) li::marker {
  color: var(--md-accent-fg-color);
  font-weight: 700;
}

.md-typeset hr {
  border-color: var(--course-border);
}

.headerlink {
  color: var(--course-muted) !important;
}

/* Inline code, code blocks, and diagrams */

.md-typeset code {
  border: var(--course-border-width) solid var(--course-border);
  border-radius: 0.3rem;
  background-color: var(--course-surface-code);
  font-size: 0.84em;
  box-shadow: var(--course-shadow-sm);
}

.md-typeset pre {
  border-radius: var(--course-radius);
}

.md-typeset pre > code {
  border: 0;
  border-radius: var(--course-radius);
  box-shadow: none;
  line-height: 1.65;
}

.md-typeset .highlight {
  margin: 1.25rem 0;
  border: var(--course-border-width) solid var(--course-border);
  border-radius: var(--course-radius);
  background-color: var(--course-surface-code);
  box-shadow: var(--course-shadow-sm);
  overflow: hidden;
}

.md-typeset .highlight pre {
  margin: 0;
  background-color: transparent;
}

.md-typeset .highlight span.filename {
  border-bottom: var(--course-border-width) solid var(--course-border);
  background-color: var(--course-surface-soft);
  color: var(--course-muted);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.035em;
}

.md-clipboard {
  border-radius: var(--course-radius-sm);
  color: var(--course-muted);
  transition: color var(--course-ease), background-color var(--course-ease);
}

/* Tables */

.md-typeset__table {
  width: 100%;
}

.md-typeset table:not([class]) {
  display: table;
  width: 100%;
  margin: 1.3rem 0;
  border: var(--course-border-width) solid var(--course-border);
  border-radius: var(--course-radius);
  background-color: var(--course-surface);
  box-shadow: var(--course-shadow-sm);
  font-size: 0.72rem;
  overflow: hidden;
}

.md-typeset table:not([class]) th,
.md-typeset table:not([class]) td {
  padding: 0.7em 1em;
  border: 0;
  border-bottom: var(--course-border-width) solid var(--course-border);
}

.md-typeset table:not([class]) th {
  background-color: var(--course-surface-soft);
  color: var(--course-ink);
  font-size: 0.67rem;
  font-weight: 800;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.md-typeset table:not([class]) tr:last-child td {
  border-bottom: 0;
}

.md-typeset table:not([class]) tbody tr {
  transition: background-color var(--course-ease);
}

.md-typeset table:not([class]) tbody tr:hover {
  background-color: color-mix(in srgb, var(--md-accent-fg-color) 5%, transparent);
}

/* Notes and module scope callouts */

.md-typeset blockquote {
  margin: 1.4rem 0;
  padding: 1rem 1.15rem;
  border: var(--course-border-width) solid var(--course-border);
  border-left: 0.22rem solid var(--course-amber);
  border-radius: 0 var(--course-radius) var(--course-radius) 0;
  background: linear-gradient(
    110deg,
    color-mix(in srgb, var(--course-amber) 7%, var(--course-surface)),
    var(--course-surface)
  );
  color: var(--course-ink);
  box-shadow: var(--course-shadow-sm);
}

.md-typeset blockquote > :first-child {
  margin-top: 0;
}

.md-typeset blockquote > :last-child {
  margin-bottom: 0;
}

.md-typeset .admonition,
.md-typeset details {
  border: var(--course-border-width) solid var(--course-border);
  border-left-width: 0.22rem;
  border-radius: var(--course-radius);
  background-color: var(--course-surface);
  box-shadow: var(--course-shadow-sm);
  overflow: hidden;
}

.md-typeset .admonition-title,
.md-typeset summary {
  background-color: color-mix(in srgb, currentColor 5%, transparent);
  font-weight: 750;
}

/* Progress lists */

.md-typeset .task-list-item {
  margin: 0.35rem 0;
}

.md-typeset .task-list-indicator::before {
  border: var(--course-border-width) solid var(--course-border-strong);
  border-radius: 0.28rem;
  background-color: var(--course-surface);
}

.md-typeset [type="checkbox"]:checked + .task-list-indicator::before {
  border-color: var(--md-accent-fg-color);
  background-color: var(--md-accent-fg-color);
}

/* Homepage intro */

.intro {
  position: relative;
  isolation: isolate;
  margin: 0 0 2.25rem;
  padding: clamp(1.7rem, 5vw, 3.4rem);
  border: var(--course-border-width) solid var(--course-border);
  border-radius: var(--course-radius-lg);
  background-color: var(--course-surface);
  background-image: linear-gradient(var(--course-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--course-grid) 1px, transparent 1px),
    radial-gradient(
      circle at 85% 20%,
      color-mix(in srgb, var(--md-accent-fg-color) 14%, transparent),
      transparent 16rem
    );
  background-size: 1.5rem 1.5rem, 1.5rem 1.5rem, auto;
  box-shadow: var(--course-shadow);
  overflow: hidden;
}

.intro::after {
  position: absolute;
  z-index: -1;
  right: -4rem;
  bottom: -5rem;
  width: 13rem;
  height: 13rem;
  border: 1.5rem solid color-mix(in srgb, var(--md-accent-fg-color) 9%, transparent);
  border-radius: 50%;
  content: "";
}

.intro__eyebrow {
  display: inline-flex;
  align-items: center;
  margin-bottom: 1rem;
  padding: 0.35rem 0.7rem;
  border: var(--course-border-width) solid var(--course-border-strong);
  border-radius: 999px;
  background-color: color-mix(in srgb, var(--course-surface) 88%, transparent);
  color: var(--md-accent-fg-color);
  font-family: var(--md-code-font-family);
  font-size: 0.63rem;
  font-weight: 700;
  letter-spacing: 0.065em;
  text-transform: uppercase;
}

.intro h1 {
  max-width: 12ch;
  margin: 0 0 0.8rem;
  padding: 0;
  font-size: clamp(2.25rem, 7vw, 4.1rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.intro h1::after,
.intro .headerlink {
  display: none;
}

.intro p {
  max-width: 43rem;
  margin: 0 0 1.6rem;
  color: var(--course-muted);
  font-size: clamp(0.92rem, 2vw, 1.05rem);
  line-height: 1.65;
}

.intro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.intro__actions .md-button {
  min-width: 8.5rem;
  border-radius: var(--course-radius-sm);
  text-align: center;
  transition: border-color var(--course-ease), background-color var(--course-ease),
    box-shadow var(--course-ease), transform var(--course-ease);
}

.intro__actions .md-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px color-mix(in srgb, var(--md-accent-fg-color) 20%, transparent);
}

.intro__actions .md-button--primary {
  border-color: var(--md-accent-fg-color);
  background-color: var(--md-accent-fg-color);
  color: var(--course-surface);
}

/* Homepage syllabus cards */

.syllabus-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 1.5rem 0 2.5rem;
}

.syllabus-card {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.2rem 0.9rem;
  align-content: start;
  min-height: 7.1rem;
  padding: 1rem 1.05rem;
  border: var(--course-border-width) solid var(--course-border);
  border-radius: var(--course-radius);
  background-color: var(--course-surface);
  color: var(--course-ink) !important;
  box-shadow: var(--course-shadow-sm);
  text-decoration: none !important;
  transition: border-color var(--course-ease), box-shadow var(--course-ease),
    transform var(--course-ease);
  overflow: hidden;
}

.syllabus-card::before {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0.18rem;
  background-color: var(--md-accent-fg-color);
  content: "";
  opacity: 0;
  transform: scaleY(0.35);
  transition: opacity var(--course-ease), transform var(--course-ease);
}

.syllabus-card:hover {
  border-color: color-mix(in srgb, var(--md-accent-fg-color) 55%, var(--course-border));
  box-shadow: var(--course-shadow);
  transform: translateY(-3px);
}

.syllabus-card:hover::before {
  opacity: 1;
  transform: scaleY(1);
}

.syllabus-card__index {
  grid-row: 1 / 3;
  min-width: 2.2rem;
  color: var(--md-accent-fg-color);
  font-family: var(--md-code-font-family);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.035em;
  line-height: 1.5;
  text-transform: uppercase;
}

.syllabus-card__title {
  font-size: 0.92rem;
  font-weight: 750;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.syllabus-card__description {
  color: var(--course-muted);
  font-size: 0.72rem;
  line-height: 1.5;
}

/* Footer and interaction details */

.md-footer {
  border-top: var(--course-border-width) solid var(--course-border);
  background-color: var(--md-primary-fg-color--dark);
}

:focus-visible {
  outline: 0.14rem solid var(--md-accent-fg-color);
  outline-offset: 0.15rem;
}

::selection {
  background-color: color-mix(in srgb, var(--md-accent-fg-color) 28%, transparent);
}

@media screen and (min-width: 76.25em) {
  .md-grid {
    max-width: 79rem;
  }
}

@media screen and (max-width: 60em) {
  .md-main__inner {
    margin-top: 1.2rem;
  }

  .md-typeset > :not(.intro):not(.syllabus-grid) {
    max-width: none;
  }
}

@media screen and (max-width: 44em) {
  .intro {
    margin-bottom: 1.6rem;
    border-radius: var(--course-radius);
  }

  .intro h1 {
    max-width: 10ch;
  }

  .syllabus-grid {
    grid-template-columns: 1fr;
  }

  .syllabus-card {
    min-height: 0;
  }

  .md-typeset h1 {
    font-size: 1.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  body {
    background: #fff;
  }

  .intro,
  .syllabus-card,
  .md-typeset .highlight,
  .md-typeset blockquote,
  .md-typeset table:not([class]) {
    box-shadow: none;
  }
}