/* Teaching site — readable CJK, quiet chrome, denser content. */

:root {
  --tx-font: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --tx-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, monospace;
  --tx-radius: 14px;
}

[data-md-color-scheme="default"] {
  --md-default-bg-color: #f4f1ea;
  --md-default-fg-color: #1c1915;
  --md-default-fg-color--light: #4a453d;
  --md-default-fg-color--lighter: #7a7368;
  --md-primary-fg-color: #1c1915;
  --md-primary-bg-color: #f4f1ea;
  --md-accent-fg-color: #b45309;
  --md-typeset-a-color: #9a4a08;
  --md-code-bg-color: #e8e2d6;
  --tx-card: #fffdf8;
  --tx-card-border: rgba(28, 25, 21, 0.1);
  --tx-hero: linear-gradient(160deg, #1c1915 0%, #3d3428 55%, #7c4a12 100%);
}

[data-md-color-scheme="slate"] {
  --md-default-bg-color: #101114;
  --md-default-fg-color: #ece8e1;
  --md-default-fg-color--light: #c4beb4;
  --md-default-fg-color--lighter: #8b857b;
  --md-primary-fg-color: #14161a;
  --md-primary-bg-color: #ece8e1;
  --md-accent-fg-color: #e0b36a;
  --md-typeset-a-color: #e0b36a;
  --md-code-bg-color: #1b1d22;
  --md-footer-bg-color: #0c0d10;
  --tx-card: #181a1f;
  --tx-card-border: rgba(236, 232, 225, 0.1);
  --tx-hero: linear-gradient(160deg, #0c0d10 0%, #1a1713 50%, #3d2a12 100%);
}

html,
body,
.md-typeset,
.md-header,
.md-nav,
.md-footer {
  font-family: var(--tx-font);
}

.md-typeset {
  font-size: 0.84rem;
  line-height: 1.78;
  letter-spacing: 0.012em;
  font-feature-settings: "kern" 1, "liga" 1;
}

.md-typeset h1 {
  font-weight: 650;
  letter-spacing: 0.01em;
  line-height: 1.28;
  margin-bottom: 0.6em;
}

.md-typeset h2,
.md-typeset h3 {
  font-weight: 620;
  letter-spacing: 0.02em;
}

.md-typeset code,
.md-typeset pre,
.md-typeset kbd {
  font-family: var(--tx-mono);
}

.md-header {
  box-shadow: none;
  border-bottom: 1px solid var(--tx-card-border);
}

.md-header__title {
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* Quiet, thin scrollbars — Firefox + Chromium */
* {
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--md-default-fg-color) 26%, transparent)
    transparent;
}

*::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}

*::-webkit-scrollbar-track {
  background: transparent;
}

*::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--md-default-fg-color) 28%, transparent);
  border-radius: 999px;
}

*::-webkit-scrollbar-thumb:hover {
  background: color-mix(in srgb, var(--md-accent-fg-color) 70%, transparent);
}

.md-sidebar__scrollwrap,
.md-content__inner,
.md-main__inner {
  scrollbar-width: thin;
}

.md-content {
  max-width: 52rem;
}

.md-typeset table:not([class]) {
  border-radius: 10px;
  overflow: hidden;
  box-shadow: none;
  border: 1px solid var(--tx-card-border);
}

.md-typeset table:not([class]) th {
  background: color-mix(in srgb, var(--md-accent-fg-color) 12%, var(--tx-card));
  font-weight: 620;
}

.md-typeset table:not([class]) td,
.md-typeset table:not([class]) th {
  padding: 0.55em 0.8em;
}

.md-typeset .admonition,
.md-typeset details {
  border-radius: var(--tx-radius);
}

/* Homepage hero + cards */
.tx-hero {
  position: relative;
  margin: 0 0 1.8rem;
  padding: 1.7rem 1.6rem 1.5rem;
  border-radius: 18px;
  color: #f6f1e8;
  background: var(--tx-hero);
  overflow: hidden;
}

.tx-hero::after {
  content: "";
  position: absolute;
  inset: auto -20% -40% 40%;
  height: 12rem;
  background: radial-gradient(circle, rgba(224, 179, 106, 0.28), transparent 68%);
  pointer-events: none;
}

.tx-hero > * {
  position: relative;
  z-index: 1;
}

.tx-hero p {
  margin: 0.35em 0 0;
  max-width: 40rem;
  color: rgba(246, 241, 232, 0.86);
  font-size: 0.95em;
  line-height: 1.7;
}

.tx-kicker {
  display: inline-block;
  margin-bottom: 0.55rem;
  padding: 0.12rem 0.55rem;
  border: 1px solid rgba(246, 241, 232, 0.28);
  border-radius: 999px;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tx-hero h1 {
  margin: 0;
  color: #f6f1e8;
  font-size: 1.85em;
  border: 0;
}

.md-typeset .grid.cards > ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14.5rem, 1fr));
  gap: 0.75rem;
}

.md-typeset .grid.cards > ul > li,
.md-typeset .tx-card {
  margin: 0;
  padding: 0.95rem 1rem 0.85rem;
  list-style: none;
  background: var(--tx-card);
  border: 1px solid var(--tx-card-border);
  border-radius: var(--tx-radius);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.md-typeset .grid.cards > ul > li:hover,
.md-typeset .tx-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--md-accent-fg-color) 55%, var(--tx-card-border));
}

.md-typeset .grid.cards > ul > li p:first-child,
.md-typeset .grid.cards > ul > li > strong:first-child {
  font-weight: 650;
}

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

.md-nav--primary .md-nav__title {
  letter-spacing: 0.04em;
}