/* ============================================================
   BLUE MERIDIAN — notes
   ------------------------------------------------------------
   Material's machinery, Blue Meridian's surface.
   Shared tokens + fonts: blue-meridian.css
   Home-only layout:      home.css
   ============================================================ */

/* ============================================================
   1. Material variables
   ============================================================ */

:root {
  --bm-header-h: 64px;
  --bm-left-w: 238px;
  --bm-right-w: 226px;
  --bm-gap: clamp(1.6rem, 3vw, 3.6rem);
  --bm-shell: 94rem;
  --bm-pad: clamp(1.1rem, 3vw, 3rem);
  --bm-read-w: 46rem;

  --bm-prose: #c3d2e5;
  --bm-prose-strong: #eef5ff;
  --bm-prose-dim: #8ea4c2;
  --bm-surface: rgba(10, 24, 42, 0.66);
  --bm-surface-solid: #0a192b;
  --bm-hair: rgba(158, 188, 222, 0.14);
  --bm-hair-strong: rgba(158, 188, 222, 0.28);
  --bm-drawer-w: min(84vw, 20rem);

  --md-text-font: "Archivo", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --md-code-font: "Spline Sans Mono", "SFMono-Regular", Consolas, "Noto Sans SC", monospace;
}

[data-md-color-scheme="slate"] {
  --md-default-fg-color: #f3f7ff;
  --md-default-fg-color--light: #8ea4c2;
  --md-default-fg-color--lighter: rgba(158, 188, 222, 0.42);
  --md-default-fg-color--lightest: rgba(158, 188, 222, 0.15);

  --md-default-bg-color: #07111f;
  --md-default-bg-color--light: rgba(7, 17, 31, 0.7);
  --md-default-bg-color--lighter: rgba(7, 17, 31, 0.35);
  --md-default-bg-color--lightest: rgba(7, 17, 31, 0.12);

  --md-primary-fg-color: #07111f;
  --md-primary-fg-color--light: #0c1d31;
  --md-primary-fg-color--dark: #040a12;
  --md-primary-bg-color: #f3f7ff;
  --md-primary-bg-color--light: rgba(243, 247, 255, 0.7);

  --md-accent-fg-color: #6fb6ff;
  --md-accent-fg-color--transparent: rgba(111, 182, 255, 0.12);
  --md-accent-bg-color: #040a12;
  --md-accent-bg-color--light: rgba(4, 10, 18, 0.7);

  --md-typeset-color: #c3d2e5;
  --md-typeset-a-color: #8ec8ff;
  --md-typeset-mark-color: rgba(111, 182, 255, 0.22);
  --md-typeset-del-color: rgba(255, 120, 140, 0.18);
  --md-typeset-ins-color: rgba(130, 230, 180, 0.16);
  --md-typeset-kbd-color: #0c1d31;
  --md-typeset-kbd-accent-color: #1a3552;
  --md-typeset-kbd-border-color: #040a12;
  --md-typeset-table-color: rgba(158, 188, 222, 0.14);
  --md-typeset-table-color--light: rgba(158, 188, 222, 0.06);
  --md-typeset-table-sort-icon: none;

  --md-admonition-fg-color: #c3d2e5;
  --md-admonition-bg-color: rgba(9, 22, 38, 0.6);

  --md-code-fg-color: #cfe0f5;
  --md-code-bg-color: #050d18;
  --md-code-bg-color--light: rgba(5, 13, 24, 0.7);
  --md-code-bg-color--lighter: rgba(5, 13, 24, 0.35);
  --md-code-hl-color: rgba(111, 182, 255, 0.35);
  --md-code-hl-color--light: rgba(111, 182, 255, 0.12);
  --md-code-hl-number-color: #f2b8a2;
  --md-code-hl-special-color: #ffb3c8;
  --md-code-hl-function-color: #d7b8ff;
  --md-code-hl-constant-color: #b9d4ff;
  --md-code-hl-keyword-color: #8fc7ff;
  --md-code-hl-string-color: #9be2c0;
  --md-code-hl-name-color: #d7e4f5;
  --md-code-hl-operator-color: #8ea4c2;
  --md-code-hl-punctuation-color: #8ea4c2;
  --md-code-hl-comment-color: #5d7693;
  --md-code-hl-generic-color: #8ea4c2;
  --md-code-hl-variable-color: #e6d3b3;

  --md-shadow-z1: 0 8px 24px rgba(0, 0, 0, 0.22);
  --md-shadow-z2: 0 16px 48px rgba(0, 0, 0, 0.32);
  --md-shadow-z3: 0 24px 80px rgba(0, 0, 0, 0.48);

  --md-footer-fg-color: #8ea4c2;
  --md-footer-bg-color: #07111f;
  --md-footer-bg-color--dark: #040a12;
  --md-footer-fg-color--light: #8ea4c2;
  --md-footer-fg-color--lighter: rgba(158, 188, 222, 0.42);
}

/* Material calibrates its own 125% root. Blue Meridian works at 100%. */
html {
  font-size: 100%;
  overflow-x: hidden;
  scroll-padding-top: calc(var(--bm-header-h) + 28px);
}

body {
  background:
    radial-gradient(90rem 60rem at 82% -18%, rgba(39, 82, 134, 0.2), transparent 62%),
    radial-gradient(70rem 52rem at 4% 112%, rgba(27, 61, 106, 0.16), transparent 64%),
    var(--bg);
  background-attachment: fixed;
  color: var(--bm-prose);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--halo-blue);
  color: var(--bg-deep);
}

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 2px;
}

* {
  scrollbar-color: rgba(142, 164, 194, 0.34) transparent;
  scrollbar-width: thin;
}

/* Material skip link */
.md-skip {
  background: var(--ink);
  color: var(--bg-deep);
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
}

/* ============================================================
   2. Header
   ============================================================ */

.md-header.bm-header {
  position: fixed;
  inset: 0 0 auto 0;
  background: rgba(6, 14, 26, 0.96);
  border-bottom: 1px solid var(--bm-hair);
  box-shadow: none;
  color: var(--ink);
  z-index: 4;
}

.md-container {
  padding-top: var(--bm-header-h);
}

.bm-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1.1rem;
  width: 100%;
  max-width: var(--bm-shell);
  height: var(--bm-header-h);
  margin-inline: auto;
  padding-inline: var(--bm-pad);
}

.bm-header__menu {
  display: none;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  margin-left: -0.35rem;
  color: var(--mist);
  cursor: pointer;
  border-radius: 999px;
  transition: color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.bm-header__menu:hover,
.bm-header__menu:focus-visible {
  color: var(--ink);
  background: rgba(111, 182, 255, 0.08);
}

.bm-header__menu svg {
  width: 20px;
  height: 20px;
}

.bm-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.72rem;
  flex: 0 0 auto;
  color: var(--ink);
  text-decoration: none;
}

.bm-brand__mark {
  width: 14px;
  height: 24px;
}

.bm-brand__mark svg {
  display: block;
  width: 100%;
  height: 100%;
}

.bm-brand__name {
  font-family: var(--display);
  font-size: 1.06rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.bm-header__rule {
  flex: 0 0 auto;
  width: 1px;
  height: 16px;
  background: var(--line);
}

.bm-crumb {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-width: 0;
  overflow: hidden;
  color: var(--mist);
  font-family: var(--mono);
  font-size: 0.56rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}

.bm-crumb__item {
  overflow: hidden;
  text-overflow: ellipsis;
}

.bm-crumb__sep {
  flex: 0 0 auto;
  color: var(--signal);
  opacity: 0.5;
}

.bm-header__nav {
  display: flex;
  align-items: center;
  gap: 1.65rem;
  margin-left: auto;
}

.bm-header__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding-block: 0.3rem;
  color: var(--mist);
  font-family: var(--mono);
  font-size: 0.61rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.bm-header__link::after {
  content: "";
  position: absolute;
  inset: auto 0 -0.05rem;
  height: 1px;
  background: linear-gradient(90deg, var(--halo-white), var(--signal));
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.35s var(--ease);
}

.bm-header__link:hover,
.bm-header__link.is-active {
  color: var(--ink);
}

.bm-header__link:hover::after,
.bm-header__link.is-active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.bm-header__link--out svg {
  width: 10px;
  height: 10px;
  opacity: 0.7;
}

.bm-header__progress {
  position: absolute;
  inset: auto 0 -1px 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(191, 227, 255, 0.3), var(--signal) 55%, var(--halo-white));
  transform: scaleX(0);
  transform-origin: left;
  pointer-events: none;
}

/* ============================================================
   3. The notes light — low opacity, in the reading gutter
   ============================================================ */

.bm-notes-light {
  position: fixed;
  top: var(--bm-header-h);
  bottom: 0;
  left: calc(
    (100vw - min(var(--bm-shell), 100vw)) / 2 + var(--bm-pad) + var(--bm-left-w) +
      var(--bm-gap) / 2
  );
  z-index: 0;
  width: 1px;
  pointer-events: none;
}

.bm-notes-light__halo {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 216px;
  height: calc(100vh - var(--bm-header-h));
  transform: translate(-50%, -50%);
  background:
    radial-gradient(
      ellipse 26% 34% at center,
      rgba(255, 255, 255, 0.80) 0%,
      rgba(234, 244, 255, 0.44) 38%,
      transparent 72%
    ),
    radial-gradient(
      ellipse 50% 50% at center,
      var(--halo-outer-falloff)
    );
  filter: blur(38px);
  opacity: 0.88;
}

.bm-notes-light--rail .bm-notes-light__halo {
  width: 108px;
}

.bm-notes-light__line {
  position: absolute;
  inset: 0;
  width: 1px;
  transform-origin: top;
  background: linear-gradient(
    to bottom,
    rgba(191, 227, 255, 0.26) 0%,
    rgba(191, 227, 255, 0.32) 10%,
    rgba(191, 227, 255, 0.42) 20%,
    rgba(222, 240, 255, 0.82) 34%,
    var(--halo-white) 44%,
    var(--halo-white) 50%,
    var(--halo-white) 56%,
    rgba(222, 240, 255, 0.82) 66%,
    rgba(191, 227, 255, 0.42) 80%,
    rgba(191, 227, 255, 0.32) 90%,
    rgba(191, 227, 255, 0.26) 100%
  );
}

/* Page switch: the notes light draws down from the header, matching home. */
@keyframes bmNotesLineGrow {
  from {
    transform: scaleY(0);
    opacity: 0;
  }
  to {
    transform: scaleY(1);
    opacity: 1;
  }
}

@keyframes bmNotesHaloIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 0.88;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .bm-notes-light__line {
    animation: bmNotesLineGrow 1.5s var(--ease-out) both;
  }

  .bm-notes-light__halo {
    animation: bmNotesHaloIn 1.8s ease 0.2s both;
  }
}


/* ============================================================
   4. Shell: course tree | reading column | section rail
   ============================================================ */

.md-main {
  position: relative;
}

.md-main__inner {
  margin-top: 0;
}

@media screen and (min-width: 1220px) {
  .md-main__inner {
    display: grid;
    grid-template-columns: var(--bm-left-w) minmax(0, 1fr) var(--bm-right-w);
    align-items: start;
    column-gap: var(--bm-gap);
    width: 100%;
    max-width: var(--bm-shell);
    margin-inline: auto;
    padding-inline: var(--bm-pad);
  }

  .md-main__inner:not(:has(.bm-rail)) {
    grid-template-columns: var(--bm-left-w) minmax(0, 1fr);
  }

  .md-main__inner:not(:has(.bm-rail)) .md-sidebar--secondary {
    display: none;
  }

  .md-sidebar {
    position: sticky;
    top: var(--bm-header-h);
    width: auto;
    height: calc(100vh - var(--bm-header-h));
    padding: 0;
    align-self: start;
  }

  .md-sidebar__scrollwrap {
    height: 100%;
    margin: 0;
    overflow-y: auto;
    overflow-x: hidden;
  }

  .md-sidebar__inner,
  [dir="ltr"] .md-sidebar__inner,
  [dir="rtl"] .md-sidebar__inner {
    height: 100%;
    padding: 0;
  }

  .md-sidebar--primary {
    grid-column: 1;
    grid-row: 1;
  }

  .md-sidebar--secondary {
    grid-column: 3;
    grid-row: 1;
    display: block;
  }

  .md-content {
    grid-column: 2;
    grid-row: 1;
    min-width: 0;
  }

  .md-content__inner,
  [dir="ltr"] .md-main__inner .md-sidebar--primary:not([hidden]) ~ .md-content > .md-content__inner,
  [dir="rtl"] .md-main__inner .md-sidebar--primary:not([hidden]) ~ .md-content > .md-content__inner {
    width: 100%;
    max-width: var(--bm-read-w);
    margin-left: auto;
    margin-right: auto;
    padding: 4.2rem 0 6.5rem;
  }

  .md-content__inner::before {
    display: none;
  }
}

@media screen and (max-width: 1219.98px) {
  .md-sidebar--secondary {
    display: none !important;
  }

  .md-content__inner {
    max-width: var(--bm-read-w);
    margin-inline: auto;
    padding: 2.9rem 1.1rem 4.5rem;
  }

  body.bm-has-rail .md-content__inner {
    padding-right: calc(1.1rem + 2.95rem);
  }

  .bm-notes-light {
    display: none;
  }
}

/* The empty secondary column is hidden by :has() above; this is the JS fallback. */
body.bm-no-rail .md-sidebar--secondary {
  display: none;
}

/* ============================================================
   5. Left course tree
   ============================================================ */

.md-nav--primary {
  padding: 4.2rem 0 2.2rem;
  font-family: var(--body);
}

@media screen and (max-width: 1219.98px) {
  .md-sidebar--primary {
    width: var(--bm-drawer-w);
    background: #081422;
    border-right: 1px solid var(--bm-hair);
    box-shadow: none;
  }

  [dir="ltr"] .md-sidebar--primary {
    left: calc(-1 * var(--bm-drawer-w));
  }

  [dir="rtl"] .md-sidebar--primary {
    right: calc(-1 * var(--bm-drawer-w));
  }

  [data-md-toggle="drawer"]:checked ~ .md-container .md-sidebar--primary {
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.55);
    transform: translateX(var(--bm-drawer-w));
  }

  [dir="rtl"] [data-md-toggle="drawer"]:checked ~ .md-container .md-sidebar--primary {
    transform: translateX(calc(-1 * var(--bm-drawer-w)));
  }

  .md-nav--primary {
    padding: 1.2rem 1.15rem 2rem;
  }
}

@media screen and (min-width: 1220px) {
  .md-nav--primary .md-nav__title {
    display: none;
  }
}

/* The lifted top level is the Course Notes section label, not a link. */
.md-nav--lifted > .md-nav__list > .md-nav__item,
.md-nav--lifted > .md-nav__title {
  display: none;
}

.md-nav--lifted > .md-nav__list > .md-nav__item--active {
  display: block;
}

.md-nav--lifted > .md-nav__list > .md-nav__item--active > .md-nav__link {
  position: static;
  margin: 0;
  padding: 0 0 1.15rem;
  background: transparent;
  box-shadow: none;
  pointer-events: none;
}

.md-nav--lifted > .md-nav__list > .md-nav__item--active > .md-nav__link .md-ellipsis {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 0.58rem;
  font-weight: 400;
  letter-spacing: 0.19em;
  text-transform: uppercase;
}

.md-nav--lifted > .md-nav__list > .md-nav__item--active > .md-nav__link .md-ellipsis::before {
  content: "";
  width: 14px;
  height: 1px;
  flex: 0 0 auto;
  background: currentColor;
  opacity: 0.7;
}

@media screen and (max-width: 1219.98px) {
  .md-nav--lifted > .md-nav__list > .md-nav__item--active > .md-nav__link {
    padding: 0.2rem 0 1.1rem;
  }
}

.md-nav--lifted > .md-nav__list > .md-nav__item > .md-nav:not(.md-nav--secondary) {
  margin-left: 0;
}

.md-nav--primary .md-nav {
  margin-left: 0;
}

.md-nav--primary .md-nav__list {
  padding-left: 0;
}

.md-nav--primary .md-nav[data-md-level="1"] > .md-nav__list {
  padding-left: 0.8rem;
}

.md-nav--primary .md-nav__link {
  display: flex;
  align-items: flex-start;
  gap: 0.4rem;
  margin: 0;
  padding: 0.4rem 0;
  color: var(--mist);
  font-size: 0.8rem;
  line-height: 1.42;
  text-decoration: none;
  transition: color 0.22s var(--ease);
}

.md-nav--primary .md-nav__link .md-ellipsis {
  overflow: visible;
  white-space: normal;
  text-overflow: clip;
}

.md-nav--primary .md-nav__link:hover {
  color: var(--ink);
}

.md-nav--primary .md-nav__link--active {
  position: relative;
  color: var(--ink);
  font-weight: 500;
  background: linear-gradient(90deg, rgba(111, 182, 255, 0.09), rgba(111, 182, 255, 0) 92%);
  border-radius: 0 4px 4px 0;
}

.md-nav--primary .md-nav__link--active::before {
  content: "";
  position: absolute;
  top: 0.42rem;
  bottom: 0.42rem;
  left: -0.78rem;
  width: 1px;
  background: linear-gradient(to bottom, var(--halo-white), var(--signal));
  box-shadow:
    0 0 8px 1px rgba(214, 236, 255, 0.55),
    0 0 18px 4px rgba(111, 182, 255, 0.25);
}

.md-nav--primary .md-nav__item--active > .md-nav__link[for] {
  color: var(--ink);
}

.md-nav--primary .md-nav[data-md-level="2"],
.md-nav--primary .md-nav[data-md-level="3"],
.md-nav--primary .md-nav[data-md-level="4"] {
  margin-left: 0.55rem;
  padding-left: 0.78rem;
  border-left: 1px solid var(--bm-hair);
}

.md-nav--primary .md-nav__icon {
  flex: 0 0 auto;
  width: 0.8rem;
  height: 0.8rem;
  margin-top: 0.3rem;
  opacity: 0.35;
  transition: opacity 0.2s var(--ease), background-color 0.2s var(--ease);
}

.md-nav--primary .md-nav__link:hover .md-nav__icon {
  opacity: 0.8;
}

.md-nav--primary .md-nav__item--nested > .md-nav__link[for] {
  cursor: pointer;
}

@media screen and (max-width: 1219.98px) {
  .md-nav--lifted > .md-nav__list > .md-nav__item--active > .md-nav__link {
    display: none;
  }

  .md-nav--primary .md-nav__title {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    height: auto;
    margin: 0 -1.15rem 0.5rem;
    padding: 1rem 1.15rem;
    background: #081422;
    border-bottom: 1px solid var(--bm-hair);
    color: var(--ink);
    font-family: var(--display);
    font-size: 1.04rem;
    font-weight: 400;
    line-height: 1.3;
    white-space: normal;
  }

  .md-nav--primary .md-nav__title .md-nav__icon {
    position: static;
    flex: 0 0 auto;
    width: 0.9rem;
    height: 0.9rem;
    margin: 0;
  }

  .md-nav--primary .md-nav__link {
    padding: 0.55rem 0;
    font-size: 0.9rem;
  }

  .md-nav--primary .md-nav__link--active::before {
    top: 0.58rem;
    bottom: 0.58rem;
  }

  .md-nav--primary .md-nav__icon {
    width: 0.95rem;
    height: 0.95rem;
    margin-top: 0.35rem;
  }
}

/* ============================================================
   6. Reading column
   ============================================================ */

.md-content__inner.md-typeset {
  color: var(--bm-prose);
  font-family: var(--body);
  font-size: 1.02rem;
  line-height: 1.82;
  font-variant-numeric: proportional-nums;
}

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

.md-typeset p {
  margin: 1.15em 0;
  text-wrap: pretty;
}

.md-typeset h1,
.md-typeset h2,
.md-typeset h3,
.md-typeset h4,
.md-typeset h5,
.md-typeset h6 {
  color: var(--ink);
  font-family: var(--display);
  text-wrap: balance;
}

.md-typeset h1 {
  margin: 0 0 1.55rem;
  color: var(--ink);
  font-size: clamp(2.5rem, 3.6vw, 3.45rem);
  font-weight: 300;
  line-height: 1.04;
  letter-spacing: -0.032em;
}

.md-typeset h2 {
  position: relative;
  margin: 2.7em 0 0.8em;
  font-size: clamp(1.65rem, 2.2vw, 2.05rem);
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: -0.022em;
}

.md-typeset h2::before {
  content: "";
  display: block;
  width: 2rem;
  height: 1px;
  margin-bottom: 0.85rem;
  background: linear-gradient(90deg, var(--signal), rgba(111, 182, 255, 0));
}

.md-typeset h3 {
  margin: 2.2em 0 0.65em;
  font-family: var(--body);
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.005em;
}

.md-typeset h4 {
  margin: 1.9em 0 0.55em;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.md-typeset h2 + h3,
.md-typeset h3 + h4 {
  margin-top: 0.8em;
}

.md-typeset h5,
.md-typeset h6 {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.md-typeset a {
  color: var(--md-typeset-a-color);
  text-decoration: underline;
  text-decoration-color: rgba(111, 182, 255, 0.32);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color 0.2s var(--ease), text-decoration-color 0.2s var(--ease);
}

.md-typeset a:hover {
  color: var(--ink);
  text-decoration-color: var(--halo-white);
}

.md-typeset strong {
  color: var(--bm-prose-strong);
  font-weight: 600;
}

.md-typeset em {
  color: #dbe8f8;
}

.md-typeset ul,
.md-typeset ol {
  margin: 1.05em 0;
  padding-left: 1.35em;
}

.md-typeset li {
  margin: 0.36em 0;
}

.md-typeset li > p {
  margin: 0.5em 0;
}

.md-typeset ul > li::marker {
  color: var(--signal);
}

.md-typeset ol > li::marker {
  color: var(--signal);
  font-family: var(--mono);
  font-size: 0.82em;
}

.md-typeset li > ul,
.md-typeset li > ol {
  margin: 0.35em 0;
}

.md-typeset hr {
  height: 1px;
  margin: 3rem 0;
  border: 0;
  background: linear-gradient(90deg, transparent, var(--bm-hair-strong) 20%, var(--bm-hair-strong) 80%, transparent);
}

.md-typeset blockquote {
  margin: 2rem 0;
  padding: 0.2rem 0 0.2rem 1.35rem;
  border-left: 1px solid var(--bm-hair-strong);
  color: #d9e6f6;
  font-family: var(--display);
  font-size: 1.16rem;
  font-style: italic;
  line-height: 1.62;
}

.md-typeset blockquote p {
  margin: 0.55em 0;
}

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

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

/* Kicker */
.bm-note-kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 1.1rem;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  line-height: 1.6;
  text-transform: uppercase;
}

.bm-note-kicker__course {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.bm-note-kicker__course::before {
  content: "";
  width: 16px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.bm-note-kicker__meta {
  color: var(--mist);
  letter-spacing: 0.1em;
  opacity: 0.8;
}

.bm-note-kicker__meta:empty {
  display: none;
}

/* ============================================================
   7. Code, tables, admonitions, media
   ============================================================ */

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

.md-typeset code {
  padding: 0.12em 0.36em;
  border: 1px solid rgba(158, 188, 222, 0.13);
  border-radius: 4px;
  background: rgba(111, 182, 255, 0.075);
  color: #d9e9ff;
  font-size: 0.84em;
  word-break: break-word;
}

.md-typeset pre {
  position: relative;
  margin: 1.7em 0;
  border: 1px solid var(--bm-hair);
  border-radius: 10px;
  background: #050d18;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.025);
}

.md-typeset pre > code {
  display: block;
  padding: 1.05rem 1.15rem;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--md-code-fg-color);
  font-size: 0.79rem;
  line-height: 1.72;
  overflow: auto;
  word-break: normal;
  tab-size: 4;
}

.md-typeset .highlight {
  background: transparent;
}

.md-typeset .highlight code {
  padding: 0;
  border: 0;
  background: transparent;
}

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

.md-typeset .linenums {
  margin-left: 2.2em;
}

.md-typeset .linenums li {
  padding-left: 0.6em;
  color: var(--md-code-fg-color);
}

.md-typeset .linenums li::marker {
  color: #4d6684;
  font-size: 0.9em;
}

.md-clipboard {
  top: 0.45rem;
  right: 0.45rem;
  width: 1.6rem;
  height: 1.6rem;
  border: 1px solid var(--bm-hair);
  border-radius: 5px;
  background: rgba(7, 17, 31, 0.78);
  color: var(--mist);
}

.md-clipboard:hover,
.md-clipboard:focus-visible {
  border-color: var(--bm-hair-strong);
  color: var(--halo-white);
}

.md-clipboard:focus {
  color: var(--halo-white);
}

/* Material 9.7's code copy button (older releases used .md-clipboard). */
.md-code__button {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  width: 1.65rem;
  height: 1.65rem;
  border: 1px solid var(--bm-hair);
  border-radius: 5px;
  background: rgba(7, 17, 31, 0.8);
  color: var(--mist);
  cursor: pointer;
  transition:
    color 0.2s var(--ease),
    border-color 0.2s var(--ease),
    background-color 0.2s var(--ease);
}

.md-code__button:hover,
.md-code__button:focus-visible {
  border-color: var(--bm-hair-strong);
  background: rgba(111, 182, 255, 0.09);
  color: var(--halo-white);
}

/* Tables — wrapper added by notes.js */
.bm-table-wrap {
  margin: 1.7em 0;
  overflow-x: auto;
  border: 1px solid var(--bm-hair);
  border-radius: 10px;
  background: rgba(7, 17, 31, 0.38);
  -webkit-overflow-scrolling: touch;
}

.bm-table-wrap:focus-visible {
  outline-offset: 2px;
}

.md-typeset .bm-table-wrap > table,
.md-typeset table {
  display: table;
  width: 100%;
  min-width: max-content;
  max-width: none;
  margin: 0;
  border: 0;
  border-radius: 0;
  border-collapse: collapse;
  background: transparent;
  font-size: 0.82rem;
  line-height: 1.55;
}

.md-typeset table:not([class]) {
  display: table;
  width: 100%;
  min-width: max-content;
  max-width: none;
  border: 0;
  border-radius: 0;
  background: transparent;
  font-size: 0.82rem;
}

.md-typeset table:not([class]) + * {
  margin-top: 0;
}

.bm-table-wrap > table th,
.md-typeset table th {
  padding: 0.7rem 0.85rem;
  border: 0;
  border-bottom: 1px solid var(--bm-hair-strong);
  background: rgba(111, 182, 255, 0.065);
  color: var(--halo-blue);
  font-family: var(--mono);
  font-size: 0.63rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-align: left;
  text-transform: uppercase;
  white-space: nowrap;
}

.bm-table-wrap > table td,
.md-typeset table td {
  padding: 0.66rem 0.85rem;
  border: 0;
  border-bottom: 1px solid var(--bm-hair);
  color: var(--bm-prose);
  text-align: left;
  vertical-align: top;
}

.bm-table-wrap > table tr:last-child td,
.md-typeset table tr:last-child td {
  border-bottom: 0;
}

.bm-table-wrap > table tbody tr:hover td,
.md-typeset table tbody tr:hover td {
  background: rgba(111, 182, 255, 0.035);
}

/* Admonitions */
/* Admonitions: classic Material type colours, restrained type-tinted glow. */
.md-typeset .admonition[class],
.md-typeset details[class] {
  position: relative;
  --adm: #448aff;
  --adm-glow: rgba(68, 138, 255, 0.3);
  --adm-glow: color-mix(in srgb, var(--adm) 30%, transparent);
  margin: 1.8em 0;
  padding: 0 1.1rem;
  border: 1px solid var(--bm-hair);
  border-left: 2px solid var(--adm);
  border-radius: 0 9px 9px 0;
  background: rgba(9, 22, 38, 0.6);
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--adm) 8%, transparent),
    rgba(8, 20, 35, 0.55)
  );
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.16);
  color: var(--bm-prose);
  font-size: 0.94rem;
}

.md-typeset .admonition[class]::before,
.md-typeset details[class]::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -2px;
  width: 2px;
  background: transparent;
  box-shadow:
    0 0 14px 3px var(--adm-glow),
    0 0 32px 8px var(--adm-glow);
  pointer-events: none;
}

.md-typeset .admonition[class] > .admonition-title,
.md-typeset details[class] > summary {
  margin: 0;
  padding: 0.9rem 0 0.55rem 1.65rem;
  border: 0;
  background: transparent;
  color: var(--adm);
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 500;
  letter-spacing: 0.11em;
  line-height: 1.5;
  text-transform: uppercase;
}

.md-typeset .admonition[class] > .admonition-title::before,
.md-typeset details[class] > summary::before {
  top: 0.92rem;
  left: 0;
  width: 0.95rem;
  height: 0.95rem;
  background-color: var(--adm);
}

.md-typeset .admonition[class] > .admonition-title + *,
.md-typeset details[class] > summary + * {
  margin-top: 0.2rem;
}

.md-typeset .admonition[class] > :last-child {
  margin-bottom: 0.95rem;
}

.md-typeset details[class] > summary {
  cursor: pointer;
}

.md-typeset details[class] > summary::after {
  top: 0.85rem;
  color: var(--adm);
}

.md-typeset details[class][open] > summary {
  border-bottom: 1px solid var(--bm-hair);
  margin-bottom: 0.8rem;
}

/* Classic Material palette, used for the border, title, icon and glow. */
.md-typeset .admonition.note[class],
.md-typeset details.note[class] { --adm: #448aff; }

.md-typeset .admonition.abstract[class],
.md-typeset details.abstract[class] { --adm: #00b0ff; }

.md-typeset .admonition.info[class],
.md-typeset details.info[class] { --adm: #00b8d4; }

.md-typeset .admonition.tip[class],
.md-typeset details.tip[class] { --adm: #00bfa5; }

.md-typeset .admonition.success[class],
.md-typeset details.success[class] { --adm: #00c853; }

.md-typeset .admonition.question[class],
.md-typeset details.question[class] { --adm: #64dd17; }

.md-typeset .admonition.warning[class],
.md-typeset details.warning[class] { --adm: #ff9100; }

.md-typeset .admonition.failure[class],
.md-typeset details.failure[class] { --adm: #ff5252; }

.md-typeset .admonition.danger[class],
.md-typeset details.danger[class] { --adm: #ff1744; }

.md-typeset .admonition.bug[class],
.md-typeset details.bug[class] { --adm: #f50057; }

.md-typeset .admonition.example[class],
.md-typeset details.example[class] { --adm: #7c4dff; }

.md-typeset .admonition.quote[class],
.md-typeset details.quote[class] { --adm: #9e9e9e; }

/* Images and figures */
.md-typeset img,
.md-typeset svg {
  max-width: 100%;
}

.md-typeset img {
  height: auto;
  border: 1px solid var(--bm-hair);
  border-radius: 9px;
  background: var(--bg-deep);
}

.md-typeset figure {
  margin: 1.9em 0;
}

.md-typeset figcaption {
  margin-top: 0.65rem;
  color: var(--mist);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  line-height: 1.5;
  text-align: center;
}

/* PDF / download links get a small marker from notes.js. */
.md-typeset a.bm-file-link {
  white-space: nowrap;
}

.md-typeset a.bm-file-link::after {
  content: "PDF";
  display: inline-block;
  margin-left: 0.38em;
  padding: 0.04em 0.28em;
  border: 1px solid rgba(111, 182, 255, 0.32);
  border-radius: 3px;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 0.52em;
  letter-spacing: 0.08em;
  vertical-align: 0.12em;
}

/* Math */
.md-typeset mjx-container {
  color: #e8f1fc;
}

.md-typeset mjx-container[display="true"] {
  display: block;
  max-width: 100%;
  margin: 1.5em 0;
  padding: 0.15em 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.md-typeset .arithmatex {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
}

/* Mermaid */


/* ============================================================
   8. Section rail
   ============================================================ */

.bm-rail {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 4.2rem 0 2.2rem;
  font-family: var(--body);
}

.bm-rail__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0 0 0.95rem;
}

.bm-rail__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 0.56rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.bm-rail__eyebrow-line {
  width: 14px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.bm-rail__count {
  color: var(--mist);
  font-family: var(--mono);
  font-size: 0.52rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
  opacity: 0.65;
}

.bm-rail__step {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
  padding: 0.46rem 0.55rem;
  border: 1px solid var(--bm-hair);
  border-radius: 6px;
  background: transparent;
  color: var(--mist);
  font-family: var(--mono);
  font-size: 0.54rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    color 0.22s var(--ease),
    border-color 0.22s var(--ease),
    background-color 0.22s var(--ease);
}

.bm-rail__step--up {
  margin-bottom: 0.9rem;
}

.bm-rail__step--down {
  margin-top: 0.9rem;
}

.bm-rail__step svg {
  width: 12px;
  height: 12px;
}

.bm-rail__step:hover:not(:disabled),
.bm-rail__step:focus-visible:not(:disabled) {
  border-color: var(--bm-hair-strong);
  background: rgba(111, 182, 255, 0.06);
  color: var(--ink);
}

.bm-rail__step:disabled {
  cursor: not-allowed;
  opacity: 0.26;
}

.bm-rail__scroll {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding-right: 0.1rem;
  overscroll-behavior: contain;
}

.bm-rail__scroll::-webkit-scrollbar {
  width: 2px;
}

.bm-rail__list,
.bm-rail__sublist {
  margin: 0;
  padding: 0;
  list-style: none;
}

.bm-rail__sublist {
  margin: 0.05rem 0 0.35rem;
}

.bm-rail__item {
  margin: 0;
}

.bm-rail__link {
  position: relative;
  display: grid;
  grid-template-columns: 1.35rem minmax(0, 1fr);
  gap: 0.42rem;
  align-items: baseline;
  margin: 0;
  padding: 0.42rem 0.42rem 0.42rem 0.55rem;
  border-left: 1px solid transparent;
  border-radius: 0 5px 5px 0;
  color: var(--mist);
  font-size: 0.732rem;
  line-height: 1.38;
  text-decoration: none;
  transition:
    color 0.2s var(--ease),
    background-color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}

.bm-rail__link:hover {
  background: rgba(158, 188, 222, 0.045);
  color: var(--ink);
}

.bm-rail__num {
  color: var(--mist);
  font-family: var(--mono);
  font-size: 0.49rem;
  letter-spacing: 0.06em;
  opacity: 0.5;
  transition: color 0.2s var(--ease), opacity 0.2s var(--ease);
}

.bm-rail__text {
  min-width: 0;
  overflow-wrap: anywhere;
}

.bm-rail__item--h3 .bm-rail__link {
  grid-template-columns: 0.75rem minmax(0, 1fr);
  padding: 0.29rem 0.42rem 0.29rem 0.95rem;
  color: #7f96b2;
  font-size: 0.692rem;
  line-height: 1.4;
}

.bm-rail__dot {
  width: 3px;
  height: 3px;
  margin-top: 0.52em;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.38;
  transition: opacity 0.2s var(--ease), background-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.bm-rail__item--h3 .bm-rail__link:hover {
  color: var(--ink);
}

.bm-rail__link.is-active {
  border-left-color: rgba(191, 227, 255, 0.8);
  background: linear-gradient(90deg, rgba(111, 182, 255, 0.115), rgba(111, 182, 255, 0.015));
  color: var(--ink);
  box-shadow: 0 0 24px rgba(111, 182, 255, 0.08);
}

.bm-rail__link.is-active::after {
  content: "";
  position: absolute;
  top: 18%;
  bottom: 18%;
  left: -1px;
  width: 1px;
  background: var(--halo-white);
  box-shadow:
    0 0 10px 2px rgba(214, 236, 255, 0.65),
    0 0 26px 6px rgba(111, 182, 255, 0.32);
}

.bm-rail__link.is-active .bm-rail__num {
  color: var(--halo-blue);
  opacity: 1;
}

.bm-rail__link.is-active .bm-rail__text {
  text-shadow: 0 0 18px rgba(191, 227, 255, 0.3);
}

.bm-rail__item--h3 .bm-rail__link.is-active {
  background: linear-gradient(90deg, rgba(111, 182, 255, 0.08), transparent);
  color: #e6f0fc;
}

.bm-rail__item--h3 .bm-rail__link.is-active .bm-rail__dot {
  background: var(--halo-white);
  opacity: 1;
  box-shadow: 0 0 8px 2px rgba(191, 227, 255, 0.55);
}

.bm-rail__link:focus-visible {
  outline-offset: 1px;
}

/* ============================================================
   9. Mobile rail + contents sheet
   ============================================================ */

.bm-mobile-rail {
  display: none;
  position: fixed;
  top: 50%;
  right: max(8px, env(safe-area-inset-right));
  z-index: 3;
  flex-direction: column;
  gap: 3px;
  padding: 5px;
  border: 1px solid var(--bm-hair-strong);
  border-radius: 999px;
  background: rgba(7, 17, 31, 0.94);
  box-shadow: 0 16px 44px rgba(0, 0, 0, 0.42);
  transform: translateY(-50%);
  transition: opacity 0.2s var(--ease), visibility 0.2s var(--ease);
}

body.bm-drawer-open .bm-mobile-rail,
body.bm-sheet-open .bm-mobile-rail {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

.bm-mobile-rail__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--mist);
  cursor: pointer;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.bm-mobile-rail__btn:hover,
.bm-mobile-rail__btn:focus-visible {
  background: rgba(111, 182, 255, 0.1);
  color: var(--ink);
}

.bm-mobile-rail__btn:disabled {
  cursor: not-allowed;
  opacity: 0.25;
}

.bm-mobile-rail__btn svg {
  width: 14px;
  height: 14px;
}

.bm-mobile-rail__btn--contents {
  gap: 0.1rem;
  border: 1px solid var(--bm-hair);
  color: var(--halo-blue);
  font-family: var(--mono);
  font-size: 0.46rem;
  letter-spacing: 0;
}

.bm-mobile-rail__btn--contents svg {
  width: 11px;
  height: 11px;
  opacity: 0.72;
}

@media screen and (max-width: 1219.98px) {
  body.bm-has-rail .bm-mobile-rail {
    display: flex;
  }
}

.bm-sheet {
  width: min(88vw, 27rem);
  max-height: min(78vh, 46rem);
  margin: auto;
  padding: 0;
  border: 1px solid var(--bm-hair-strong);
  border-radius: 14px;
  background: rgba(8, 20, 34, 0.97);
  color: var(--ink);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.65);
}

.bm-sheet::backdrop {
  background: rgba(2, 7, 13, 0.78);
}

.bm-sheet__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.05rem 1.1rem 0.9rem;
  border-bottom: 1px solid var(--bm-hair);
}

.bm-sheet__eyebrow {
  color: var(--signal);
  font-family: var(--mono);
  font-size: 0.56rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.bm-sheet__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid var(--bm-hair);
  border-radius: 50%;
  background: transparent;
  color: var(--mist);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

.bm-sheet__close:hover,
.bm-sheet__close:focus-visible {
  border-color: var(--bm-hair-strong);
  color: var(--ink);
}

.bm-sheet__body {
  max-height: calc(min(78vh, 46rem) - 4rem);
  overflow-y: auto;
  padding: 0.65rem 0.6rem 1rem;
}

.bm-sheet .bm-rail__link {
  padding-top: 0.62rem;
  padding-bottom: 0.62rem;
  font-size: 0.85rem;
}

.bm-sheet .bm-rail__item--h3 .bm-rail__link {
  padding-top: 0.48rem;
  padding-bottom: 0.48rem;
  font-size: 0.78rem;
}

/* ============================================================
   9b. Notes hub
   ============================================================ */

.md-typeset .course-grid {
  display: flex;
  flex-direction: column;
  margin: 2.2rem 0 1.6rem;
  border-top: 1px solid var(--bm-hair);
}

.md-typeset a.course-card {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr) 1.4rem;
  align-items: center;
  gap: 1.05rem;
  padding: 1.35rem 0.2rem;
  border-bottom: 1px solid var(--bm-hair);
  color: var(--ink);
  text-decoration: none;
  transition: background-color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.md-typeset a.course-card:hover {
  background: linear-gradient(90deg, rgba(111, 182, 255, 0.055), transparent 72%);
  border-bottom-color: var(--bm-hair-strong);
  color: var(--ink);
  text-decoration: none;
}

.course-card__num {
  align-self: start;
  padding-top: 0.28rem;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 0.55rem;
  letter-spacing: 0.08em;
  opacity: 0.8;
}

.course-card__body {
  display: block;
  min-width: 0;
}

.course-card__name {
  display: block;
  color: var(--ink);
  font-family: var(--display);
  font-size: 1.38rem;
  font-weight: 300;
  line-height: 1.22;
  letter-spacing: -0.016em;
}

.course-card__meta {
  display: block;
  margin-top: 0.36rem;
  color: var(--mist);
  font-family: var(--mono);
  font-size: 0.56rem;
  letter-spacing: 0.09em;
  line-height: 1.5;
  text-transform: uppercase;
}

.course-card__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--mist);
  font-family: var(--mono);
  font-size: 0.9rem;
  opacity: 0.5;
  transition: color 0.25s var(--ease), opacity 0.25s var(--ease), transform 0.3s var(--ease);
}

.md-typeset a.course-card:hover .course-card__arrow {
  color: var(--halo-blue);
  opacity: 1;
  transform: translate(2px, -2px);
}

.md-typeset .course-footnote {
  margin-top: 1.3rem;
  color: var(--mist);
  font-size: 0.86rem;
}

@media screen and (max-width: 640px) {
  .md-typeset a.course-card {
    grid-template-columns: 1.55rem minmax(0, 1fr) 1.2rem;
    gap: 0.7rem;
    padding-block: 1.1rem;
  }

  .course-card__name {
    font-size: 1.16rem;
  }

  .course-card__meta {
    font-size: 0.53rem;
  }
}

/* ============================================================
   10. Footer
   ============================================================ */

.bm-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--bm-hair);
}

.bm-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.4rem;
  width: 100%;
  max-width: var(--bm-shell);
  margin-inline: auto;
  padding: 1.5rem var(--bm-pad);
  color: var(--mist);
  font-family: var(--mono);
  font-size: 0.55rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.bm-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.bm-footer__mark {
  width: 2px;
  height: 13px;
  background: linear-gradient(to bottom, var(--halo-white), rgba(111, 182, 255, 0.15));
}

.bm-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
}

.bm-footer__nav a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.bm-footer__nav a:hover {
  color: var(--ink);
}

@media screen and (max-width: 640px) {
  .bm-footer__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.9rem;
    padding-block: 1.4rem;
  }
}

/* ============================================================
   11. Responsive header + motion
   ============================================================ */

@media screen and (max-width: 1219.98px) {
  .bm-header__menu {
    display: flex;
  }

  .bm-header__rule,
  .bm-crumb {
    display: none;
  }

  .bm-header__inner {
    height: 58px;
    gap: 0.7rem;
  }

  .bm-header__nav {
    gap: 1.05rem;
  }

  .bm-header__link--out {
    display: none;
  }

  :root {
    --bm-header-h: 58px;
  }
}

@media screen and (max-width: 480px) {
  .bm-header__inner {
    padding-inline: 0.95rem;
  }

  .bm-brand__name {
    font-size: 0.98rem;
  }

  .bm-header__nav {
    gap: 0.75rem;
  }

  .bm-header__link {
    font-size: 0.55rem;
    letter-spacing: 0.06em;
  }

  .md-typeset h1 {
    font-size: 2.25rem;
  }

  .md-typeset h2 {
    font-size: 1.55rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}