/* ── Typography & Base ────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --md-text-font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --md-code-font: "JetBrains Mono", "Fira Code", monospace;
}

/* High contrast overrides for accessibility */
[data-md-color-scheme="slate"] {
  --md-default-fg-color: hsla(0, 0%, 95%, 1);
  --md-default-fg-color--light: hsla(0, 0%, 85%, 1);
  --md-default-bg-color: hsla(0, 0%, 7%, 1);
  --md-code-fg-color: hsla(0, 0%, 95%, 1);
  --md-code-bg-color: hsla(0, 0%, 12%, 1);
  --md-typeset-a-color: hsl(210, 100%, 75%);
}

[data-md-color-scheme="default"] {
  --md-default-fg-color: hsla(0, 0%, 12%, 1);
  --md-default-fg-color--light: hsla(0, 0%, 25%, 1);
  --md-default-bg-color: hsla(0, 0%, 100%, 1);
  --md-code-fg-color: hsla(0, 0%, 12%, 1);
  --md-code-bg-color: hsla(0, 0%, 97%, 1);
  --md-typeset-a-color: hsl(210, 80%, 40%);
}

/* ── Smooth transitions ───────────────────────────────────── */
.md-header,
.md-tabs,
.md-sidebar,
.md-content,
.md-footer,
.md-nav__link,
.md-typeset a,
.md-button,
.md-clipboard {
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Buttons (hover lift) ─────────────────────────────────── */
.md-button {
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.md-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(64, 81, 181, 0.3);
}

.md-button--primary {
  background: linear-gradient(135deg, #4051b5 0%, #5c6bc0 100%);
  border: none;
}

.md-button--primary:hover {
  background: linear-gradient(135deg, #303f9f 0%, #3f51b5 100%);
}

/* ── Stats grid (homepage) ────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.stats-card {
  background: var(--md-code-bg-color);
  border: 1px solid var(--md-default-fg-color--lightest, rgba(0,0,0,0.07));
  border-radius: 12px;
  padding: 1.2rem 1rem;
  text-align: center;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.stats-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(64, 81, 181, 0.12);
  border-color: rgba(64, 81, 181, 0.3);
}

.stats-card .stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  background: linear-gradient(135deg, #4051b5, #5c6bc0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stats-card .stat-label {
  font-size: 0.8rem;
  color: var(--md-default-fg-color--light);
  margin-top: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 500;
}

/* ── Code blocks ──────────────────────────────────────────── */
.highlight {
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.highlight:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.md-typeset pre > code {
  border-radius: 8px;
}

/* ── Tables ───────────────────────────────────────────────── */
.md-typeset table:not([class]) {
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--md-default-fg-color--lightest, rgba(0,0,0,0.07));
}

.md-typeset table:not([class]) th {
  background: linear-gradient(135deg, #4051b5, #5c6bc0);
  color: #fff;
  font-weight: 600;
  padding: 0.8rem 1rem;
}

.md-typeset table:not([class]) td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--md-default-fg-color--lightest, rgba(0,0,0,0.04));
}

.md-typeset table:not([class]) tr:last-child td {
  border-bottom: none;
}

.md-typeset table:not([class]) tbody tr:hover td {
  background-color: rgba(64, 81, 181, 0.04);
}

/* ── Admonition enhancements ──────────────────────────────── */
.md-typeset .admonition,
.md-typeset details {
  border-radius: 10px;
  border-left-width: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

/* ── Header links ─────────────────────────────────────────── */
.md-typeset h1,
.md-typeset h2,
.md-typeset h3 {
  font-weight: 600;
  letter-spacing: -0.02em;
}

.md-typeset h1 {
  font-weight: 700;
  font-size: 2.2em;
}

/* ── Footer ───────────────────────────────────────────────── */
.md-footer {
  background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
}

.md-footer-meta {
  background: rgba(0, 0, 0, 0.15);
}

/* ── Navigation ───────────────────────────────────────────── */
.md-nav__link:hover {
  color: #4051b5;
}

.md-nav__link--active {
  font-weight: 600;
}

/* ── Search ───────────────────────────────────────────────── */
.md-search__input {
  border-radius: 6px;
}

/* ── Hero section (homepage) ──────────────────────────────── */
.hero-section {
  text-align: center;
  padding: 3rem 1rem;
  margin: -1rem -1rem 2rem -1rem;
  background: linear-gradient(135deg, rgba(64, 81, 181, 0.05) 0%, rgba(92, 107, 192, 0.08) 100%);
  border-radius: 12px;
}

.hero-section h1 {
  font-size: 2.8em;
  margin-bottom: 0.3em;
  background: linear-gradient(135deg, #4051b5 0%, #7c4dff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-section .hero-tagline {
  font-size: 1.2em;
  color: var(--md-default-fg-color--light);
  margin-bottom: 1.5em;
}

.hero-section .hero-buttons {
  display: flex;
  gap: 0.8rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Feature cards ────────────────────────────────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.2rem;
  margin: 1.5rem 0;
}

.feature-card {
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--md-default-fg-color--lightest, rgba(0,0,0,0.07));
  background: var(--md-code-bg-color);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(64, 81, 181, 0.1);
  border-color: rgba(64, 81, 181, 0.25);
}

.feature-card .feature-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.feature-card .feature-title {
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
}

.feature-card .feature-desc {
  font-size: 0.9rem;
  color: var(--md-default-fg-color--light);
}

/* ── Tabs ─────────────────────────────────────────────────── */
.md-typeset .tabbed-labels {
  border-radius: 8px 8px 0 0;
}

.md-typeset .tabbed-labels > label {
  padding: 0.6em 1.2em;
  font-weight: 500;
}

/* ── Blockquotes ──────────────────────────────────────────── */
.md-typeset blockquote {
  border-left: 4px solid #5c6bc0;
  border-radius: 0 8px 8px 0;
  background: rgba(64, 81, 181, 0.04);
}

/* ── Scrollbar ────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--md-default-bg-color);
}

::-webkit-scrollbar-thumb {
  background: #c5cae9;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #9fa8da;
}

[data-md-color-scheme="slate"] ::-webkit-scrollbar-thumb {
  background: #3949ab;
}

[data-md-color-scheme="slate"] ::-webkit-scrollbar-thumb:hover {
  background: #5c6bc0;
}

/* ── Badge / chip ─────────────────────────────────────────── */
.md-badge {
  border-radius: 6px;
}

/* ── Diagram & image zoom overlay ──────────────────────────── */
.diagram-overlay {
  display: flex;
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  background: rgba(0, 0, 0, 0.85);
  z-index: 9999;
  cursor: zoom-out;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.diagram-overlay.active {
  opacity: 1;
  visibility: visible;
}
.diagram-overlay-content {
  max-width: 95vw;
  max-height: 95vh;
  overflow: auto;
  background: var(--md-default-bg-color);
  border-radius: 8px;
  padding: 24px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}
.diagram-overlay-content .mermaid {
  display: flex;
  justify-content: center;
}
.diagram-overlay-content img {
  display: block;
  margin: 0 auto;
}

/* ── High contrast mode via prefers-contrast ─────────────────── */
@media (prefers-contrast: high) {
  [data-md-color-scheme="slate"] {
    --md-default-fg-color: hsla(0, 0%, 100%, 1);
    --md-default-bg-color: hsl(0, 0%, 0%);
    --md-code-fg-color: hsla(0, 0%, 100%, 1);
    --md-code-bg-color: hsl(0, 0%, 5%);
    --md-typeset-a-color: hsl(210, 100%, 80%);
    --md-default-fg-color--light: hsla(0, 0%, 90%, 1);
  }

  [data-md-color-scheme="default"] {
    --md-default-fg-color: hsl(0, 0%, 0%);
    --md-default-bg-color: hsl(0, 0%, 100%);
    --md-code-fg-color: hsl(0, 0%, 0%);
    --md-code-bg-color: hsl(0, 0%, 100%);
    --md-typeset-a-color: hsl(210, 100%, 30%);
    --md-default-fg-color--light: hsl(0, 0%, 20%);
  }
}

/* ── responsive ───────────────────────────────────────────── */
@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .hero-section h1 {
    font-size: 2em;
  }
}