/* ==========================================================================
   Skill Library Field Workshop — visual identity
   Professional, tech-sleek, blue. Reference aesthetic: a modern developer-tool
   landing page. Two schemes (slate default + light mirror), one token set.
   No external JS, no CDN assets beyond Material's built-ins.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design tokens
   -------------------------------------------------------------------------- */

:root {
  /* Brand palette (scheme-independent). */
  --skl-navy: #0b1220;       /* deep base */
  --skl-surface: #111a2e;    /* raised surface (dark) */
  --skl-indigo: #4f6df5;     /* primary brand */
  --skl-indigo-bright: #6a86ff;
  --skl-cyan: #22d3ee;       /* accent */

  /* Geometry. */
  --skl-radius: 12px;
  --skl-radius-sm: 8px;
  --skl-shadow: 0 1px 2px rgba(11, 18, 32, 0.06),
                0 6px 20px rgba(11, 18, 32, 0.06);
  --skl-shadow-hover: 0 2px 6px rgba(11, 18, 32, 0.10),
                      0 12px 32px rgba(11, 18, 32, 0.12);
}

/* Header stays deep navy in BOTH schemes (primary: custom reads these). */
:root,
[data-md-color-scheme="slate"],
[data-md-color-scheme="default"] {
  --md-primary-fg-color: var(--skl-navy);
  --md-primary-fg-color--light: #1b2740;
  --md-primary-fg-color--dark: #070c16;
  --md-primary-bg-color: #ffffff;
  --md-primary-bg-color--light: rgba(255, 255, 255, 0.72);
  --md-accent-fg-color: var(--skl-cyan);
}

/* Slate: navy canvas, indigo links, cyan hover. */
[data-md-color-scheme="slate"] {
  --md-default-bg-color: var(--skl-navy);
  --md-default-bg-color--light: #0e1626;
  --md-default-bg-color--lighter: #16223a;
  --md-typeset-a-color: var(--skl-indigo-bright);
  --md-accent-fg-color: var(--skl-cyan);

  --skl-page-bg: var(--skl-navy);
  --skl-card-bg: var(--skl-surface);
  --skl-card-border: rgba(255, 255, 255, 0.09);
  --skl-card-border-hover: rgba(34, 211, 238, 0.55);
  --skl-muted: rgba(226, 232, 240, 0.68);
  --skl-chip-bg: rgba(79, 109, 245, 0.16);
  --skl-hero-text: #f4f7ff;
}

/* Light mirror: pale surfaces, same indigo/cyan, navy header. */
[data-md-color-scheme="default"] {
  --md-default-bg-color: #f6f8fc;
  --md-typeset-a-color: var(--skl-indigo);
  --md-accent-fg-color: #0891b2; /* darker cyan for AA contrast on white */

  --skl-page-bg: #f6f8fc;
  --skl-card-bg: #ffffff;
  --skl-card-border: rgba(11, 18, 32, 0.10);
  --skl-card-border-hover: rgba(79, 109, 245, 0.55);
  --skl-muted: rgba(30, 41, 59, 0.66);
  --skl-chip-bg: rgba(79, 109, 245, 0.10);
  --skl-hero-text: #f4f7ff;
}

/* --------------------------------------------------------------------------
   2. Global polish
   -------------------------------------------------------------------------- */

.md-header {
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.md-typeset pre > code {
  border-radius: var(--skl-radius-sm);
}

/* Reusable card primitive. */
.skl-card {
  background: var(--skl-card-bg);
  border: 1px solid var(--skl-card-border);
  border-radius: var(--skl-radius);
  box-shadow: var(--skl-shadow);
  transition: border-color 140ms ease, box-shadow 140ms ease,
    transform 140ms ease;
}

.skl-card:hover {
  border-color: var(--skl-card-border-hover);
  box-shadow: var(--skl-shadow-hover);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   3. Hero
   -------------------------------------------------------------------------- */

.skl-hero {
  position: relative;
  overflow: hidden;
  border-radius: var(--skl-radius);
  margin: 0.4rem 0 2.4rem;
  padding: 2.6rem 2rem;
  color: var(--skl-hero-text);
  /* SVG circuit/grid tile (top) over a navy -> indigo gradient (bottom). */
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='32' height='32'%3E%3Cpath d='M0 .5H32M.5 0V32' stroke='%238fb0ff' stroke-opacity='0.10' fill='none'/%3E%3Ccircle cx='.5' cy='.5' r='1.1' fill='%2322d3ee' fill-opacity='0.28'/%3E%3C/svg%3E"),
    linear-gradient(135deg, #0b1220 0%, #182a63 58%, #3b56d4 120%);
  background-size: 32px 32px, cover;
}

/* Faint glow, not animated. */
.skl-hero::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 460px;
  height: 460px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.22), transparent 62%);
  pointer-events: none;
}

.skl-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 2rem;
  align-items: center;
}

.md-typeset .skl-hero h1 {
  margin: 0 0 0.5rem;
  color: var(--skl-hero-text);
  font-weight: 800;
  font-size: 2.3rem;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.skl-hero__lead {
  margin: 0 0 1.4rem;
  font-size: 1.05rem;
  line-height: 1.55;
  color: rgba(244, 247, 255, 0.86);
  max-width: 34rem;
}

.skl-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.md-typeset .skl-hero .md-button {
  margin: 0;
  border-radius: var(--skl-radius-sm);
  font-weight: 600;
  border-width: 1px;
}

/* Primary button: indigo fill. */
.md-typeset .skl-hero .md-button--primary {
  background: var(--skl-indigo);
  border-color: var(--skl-indigo);
  color: #ffffff;
}

.md-typeset .skl-hero .md-button--primary:hover {
  background: var(--skl-cyan);
  border-color: var(--skl-cyan);
  color: #06222a;
}

/* Secondary button: outline on the dark band. */
.md-typeset .skl-hero .md-button:not(.md-button--primary) {
  color: var(--skl-hero-text);
  border-color: rgba(255, 255, 255, 0.35);
}

.md-typeset .skl-hero .md-button:not(.md-button--primary):hover {
  border-color: var(--skl-cyan);
  color: var(--skl-cyan);
  background: rgba(34, 211, 238, 0.08);
}

/* --------------------------------------------------------------------------
   4. Module pipeline (hero right) — vertical stepper connected by a rail
   -------------------------------------------------------------------------- */

.skl-pipeline {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.skl-pipeline__chip {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.5rem 0.75rem 0.5rem 0.5rem;
  border-radius: var(--skl-radius-sm);
  color: var(--skl-hero-text);
  font-size: 0.82rem;
  font-weight: 600;
  transition: background 140ms ease;
}

.skl-pipeline__chip:hover {
  background: rgba(255, 255, 255, 0.05);
}

/* Numbered badge doubles as the rail node. */
.skl-pipeline__num {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  background: rgba(34, 211, 238, 0.12);
  border: 1px solid rgba(34, 211, 238, 0.45);
  font-family: var(--md-code-font-family, monospace);
  font-size: 0.72rem;
  color: var(--skl-cyan);
}

/* Vertical rail connecting each node to the next. */
.skl-pipeline__chip:not(:last-child) .skl-pipeline__num::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  width: 1px;
  height: calc(0.5rem + 0.5rem);
  transform: translateX(-0.5px);
  background: rgba(34, 211, 238, 0.35);
}

.skl-pipeline__ic {
  display: inline-flex;
  color: var(--skl-cyan);
  flex: none;
}

.skl-pipeline__chip .twemoji svg {
  width: 1.05rem;
  height: 1.05rem;
  fill: currentColor;
}

/* --------------------------------------------------------------------------
   5. Stat band
   -------------------------------------------------------------------------- */

.skl-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin: 0 0 2.6rem;
}

.skl-stat {
  padding: 1.2rem 1.1rem;
  text-align: left;
}

.skl-stat__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: var(--skl-radius-sm);
  background: var(--skl-chip-bg);
  color: var(--skl-indigo);
  margin-bottom: 0.7rem;
}

.skl-stat__icon .twemoji svg {
  width: 1.2rem;
  height: 1.2rem;
  fill: currentColor;
}

.skl-stat__num {
  font-size: 1.9rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--md-default-fg-color);
}

.skl-stat__label {
  margin-top: 0.25rem;
  font-size: 0.8rem;
  color: var(--skl-muted);
}

/* --------------------------------------------------------------------------
   6. Section headings on the landing page
   -------------------------------------------------------------------------- */

.md-typeset .skl-section-title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 0.3rem;
}

.skl-section-sub {
  margin: 0 0 1.3rem;
  color: var(--skl-muted);
}

/* --------------------------------------------------------------------------
   7. Differentiators band (the four moats)
   -------------------------------------------------------------------------- */

.skl-diffs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 0 0 2.6rem;
}

.skl-diff {
  padding: 1.2rem 1.2rem 1.1rem;
  border-left: 3px solid var(--skl-indigo);
}

.md-typeset .skl-diff h3 {
  margin: 0 0 0.35rem;
  font-size: 0.98rem;
  font-weight: 700;
}

.skl-diff p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--skl-muted);
}

/* --------------------------------------------------------------------------
   8. Module cards
   -------------------------------------------------------------------------- */

.skl-modules {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 0 0 2.6rem;
}

.skl-module {
  display: flex;
  flex-direction: column;
  padding: 1.3rem 1.3rem 1rem;
}

.skl-module__head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}

.skl-module__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--skl-radius-sm);
  background: var(--skl-chip-bg);
  color: var(--skl-indigo);
  flex: none;
}

.skl-module__icon .twemoji svg {
  width: 1.15rem;
  height: 1.15rem;
  fill: currentColor;
}

.md-typeset .skl-module__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.skl-module__desc {
  flex: 1 1 auto;
  margin: 0 0 1rem;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--skl-muted);
}

.skl-module__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
}

.skl-module__time {
  color: var(--skl-muted);
}

.md-typeset .skl-module__link {
  font-weight: 600;
}

/* Core / moat badge (module 05). */
.skl-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  margin-left: auto;
  padding: 0.12rem 0.5rem;
  border-radius: 999px;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #06222a;
  background: var(--skl-cyan);
}

.skl-module--core {
  border-color: var(--skl-card-border-hover);
}

/* --------------------------------------------------------------------------
   9. "Before you start" callouts
   -------------------------------------------------------------------------- */

.skl-notes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 0 0 2rem;
}

.skl-note {
  padding: 1.1rem 1.2rem;
  border-left: 3px solid var(--skl-cyan);
}

.skl-note__head {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
  font-size: 0.9rem;
}

.skl-note__head .twemoji svg {
  width: 1.05rem;
  height: 1.05rem;
  fill: var(--skl-cyan);
}

.skl-note p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.5;
  color: var(--skl-muted);
}

/* --------------------------------------------------------------------------
   10. Admonitions + tables, themed to the palette (both schemes)
   -------------------------------------------------------------------------- */

.md-typeset .admonition,
.md-typeset details {
  border-radius: var(--skl-radius-sm);
  border-left-width: 3px;
  box-shadow: var(--skl-shadow);
}

.md-typeset .admonition.note,
.md-typeset details.note {
  border-left-color: var(--skl-indigo);
}

.md-typeset table:not([class]) {
  border-radius: var(--skl-radius-sm);
  overflow: hidden;
  border: 1px solid var(--skl-card-border);
}

.md-typeset table:not([class]) th {
  background: var(--skl-chip-bg);
  color: var(--md-default-fg-color);
  font-weight: 700;
}

/* Schedule table (facilitator guide): tight rows, fixed time column. */
.md-typeset table.skl-schedule {
  font-size: 0.85rem;
}

.md-typeset table.skl-schedule th,
.md-typeset table.skl-schedule td {
  padding: 0.35rem 0.7rem;
}

.md-typeset table.skl-schedule td:first-child,
.md-typeset table.skl-schedule th:first-child {
  width: 6.5rem;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  color: var(--skl-indigo);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   11. Content-page grids (module/exercise pages reuse the card look)
   -------------------------------------------------------------------------- */

.md-typeset .grid.cards > ul > li,
.md-typeset .grid > .card {
  border-radius: var(--skl-radius);
  border-color: var(--skl-card-border);
  transition: border-color 140ms ease, box-shadow 140ms ease,
    transform 140ms ease;
}

.md-typeset .grid.cards > ul > li:hover {
  border-color: var(--skl-card-border-hover);
  box-shadow: var(--skl-shadow-hover);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   12. Responsive — collapse grids, scroll the pipeline
   -------------------------------------------------------------------------- */

@media screen and (max-width: 76.1875em) {
  .skl-hero__grid {
    grid-template-columns: 1fr;
    gap: 1.6rem;
  }
}

@media screen and (max-width: 44.9375em) {
  .skl-hero {
    padding: 1.8rem 1.2rem;
  }

  .md-typeset .skl-hero h1 {
    font-size: 1.8rem;
  }

  .skl-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .skl-diffs,
  .skl-modules,
  .skl-notes {
    grid-template-columns: 1fr;
  }
}