/* --------------------------------------------------------------------------
   Design tokens: every component below consumes these theme-aware variables.
   Solid colors are fallbacks; translucent colors are enhanced with blur.
   -------------------------------------------------------------------------- */
:root {
  --md-text-font: "Inter", "Noto Sans SC", "PingFang SC", system-ui, sans-serif;
  --bimsa-radius: 0.85rem;
  --bimsa-blur: 18px;
  --bimsa-content-width: 80rem;
}

[data-md-color-scheme="default"] {
  --bimsa-page-bg: #f7f8fa;
  --bimsa-surface-bg: #ffffff;
  --bimsa-header-bg: rgba(250, 251, 253, 0.86);
  --bimsa-sidebar-bg: rgba(255, 255, 255, 0.56);
  --bimsa-glass-bg: rgba(255, 255, 255, 0.7);
  --bimsa-border: rgba(15, 23, 42, 0.1);
  --bimsa-text: #172033;
  --bimsa-text-muted: #5c677d;
  --bimsa-accent: #2563eb;
  --bimsa-accent-secondary: #0891b2;
  --bimsa-shadow: 0 16px 42px rgba(40, 55, 85, 0.09);
  --bimsa-hero-blue: rgba(59, 130, 246, 0.2);
  --bimsa-hero-cyan: rgba(6, 182, 212, 0.16);
  --bimsa-hero-violet: rgba(139, 92, 246, 0.15);
  --bimsa-code-bg: #f1f4f9;
}

[data-md-color-scheme="slate"] {
  --md-default-bg-color: #0c0e12;
  --md-default-fg-color: #e5e9f0;
  --md-default-fg-color--light: #abb4c4;
  --md-code-bg-color: #151920;
  --bimsa-page-bg: #0c0e12;
  --bimsa-surface-bg: #12151a;
  --bimsa-header-bg: rgba(12, 14, 18, 0.84);
  --bimsa-sidebar-bg: rgba(18, 21, 27, 0.62);
  --bimsa-glass-bg: rgba(23, 27, 35, 0.68);
  --bimsa-border: rgba(203, 213, 225, 0.13);
  --bimsa-text: #edf1f7;
  --bimsa-text-muted: #a4aec0;
  --bimsa-accent: #60a5fa;
  --bimsa-accent-secondary: #22d3ee;
  --bimsa-shadow: 0 18px 48px rgba(0, 0, 0, 0.34);
  --bimsa-hero-blue: rgba(37, 99, 235, 0.22);
  --bimsa-hero-cyan: rgba(8, 145, 178, 0.16);
  --bimsa-hero-violet: rgba(109, 40, 217, 0.18);
  --bimsa-code-bg: #151920;
}

/* Base document and serious long-form reading. */
body,
.md-main {
  background: var(--bimsa-page-bg);
  color: var(--bimsa-text);
}

.md-grid {
  max-width: var(--bimsa-content-width);
}


.md-typeset {
  color: var(--bimsa-text);
  font-size: 0.82rem;
  line-height: 1.78;
}

.md-typeset h1 {
  color: var(--bimsa-text);
  font-weight: 750;
  letter-spacing: -0.025em;
}

.md-typeset h2 {
  margin-top: 1.9em;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.md-typeset h3,
.md-typeset h4 {
  color: var(--bimsa-text);
  font-weight: 650;
}

.md-typeset a {
  color: var(--bimsa-accent);
}

.md-typeset blockquote {
  color: var(--bimsa-text-muted);
  border-left-color: var(--bimsa-accent-secondary);
}

.md-typeset img {
  max-width: 100%;
  height: auto;
}

.md-typeset code {
  border: 1px solid var(--bimsa-border);
}

.md-typeset pre > code {
  border: 0;
}

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

/* Translucent header, tabs, search and palette/repository controls. */
.md-header {
  color: var(--bimsa-text);
  background: var(--bimsa-surface-bg);
  background: linear-gradient(110deg, var(--bimsa-header-bg), var(--bimsa-glass-bg));
  border-bottom: 1px solid var(--bimsa-border);
  box-shadow: 0 4px 22px rgba(0, 0, 0, 0.04);
  backdrop-filter: blur(var(--bimsa-blur)) saturate(145%);
  -webkit-backdrop-filter: blur(var(--bimsa-blur)) saturate(145%);
}

.md-header__inner {
  min-height: 2.8rem;
}

.md-header__button,
.md-header__title,
.md-header__topic,
.md-header__button.md-icon {
  color: var(--bimsa-text);
}

.md-header__button:hover,
.md-header__button:focus-visible {
  color: var(--bimsa-accent);
}

.md-header__button:focus-visible,
.md-search__input:focus-visible {
  outline: 2px solid var(--bimsa-accent);
  outline-offset: 2px;
}

.md-tabs {
  color: var(--bimsa-text-muted);
  background: var(--bimsa-surface-bg);
  background: var(--bimsa-header-bg);
  border-bottom: 1px solid var(--bimsa-border);
  backdrop-filter: blur(var(--bimsa-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--bimsa-blur)) saturate(140%);
}

.md-tabs__link--active,
.md-tabs__link:hover {
  color: var(--bimsa-accent);
}

.md-search__form {
  background: var(--bimsa-sidebar-bg);
  border: 1px solid var(--bimsa-border);
  border-radius: 0.65rem;
  box-shadow: none;
}

.md-search__form:hover,
.md-search__form:focus-within {
  background: var(--bimsa-glass-bg);
  border-color: color-mix(in srgb, var(--bimsa-accent) 42%, transparent);
}

.md-search__input,
.md-search__icon,
.md-search__options {
  color: var(--bimsa-text);
}

/* Light-touch desktop side navigation and table of contents. */
@media screen and (min-width: 76.25em) {
  .md-sidebar--primary .md-sidebar__scrollwrap,
  .md-sidebar--secondary .md-sidebar__scrollwrap {
    background: var(--bimsa-sidebar-bg);
    border: 1px solid var(--bimsa-border);
    border-radius: 0.75rem;
    scrollbar-color: var(--bimsa-border) transparent;
  }

  .md-sidebar--primary .md-sidebar__inner,
  .md-sidebar--secondary .md-sidebar__inner {
    padding: 0.45rem;
  }
}

.md-nav__link {
  color: var(--bimsa-text-muted);
}

.md-nav__link:hover,
.md-nav__link:focus,
.md-nav__link--active {
  color: var(--bimsa-accent);
}

.md-nav__link--active {
  font-weight: 650;
}

/* Homepage hero: CSS-only mathematical/AI visual, no external brand assets. */
.bimsa-hero {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(17rem, 0.75fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  min-height: 28rem;
  margin: 0.5rem 0 1.25rem;
  padding: clamp(2rem, 5vw, 4.5rem);
  overflow: hidden;
  color: var(--bimsa-text);
  background: var(--bimsa-surface-bg);
  background:
    radial-gradient(circle at 12% 15%, var(--bimsa-hero-blue), transparent 38%),
    radial-gradient(circle at 84% 20%, var(--bimsa-hero-violet), transparent 34%),
    radial-gradient(circle at 72% 88%, var(--bimsa-hero-cyan), transparent 36%),
    var(--bimsa-glass-bg);
  border: 1px solid var(--bimsa-border);
  border-radius: 1.4rem;
  box-shadow: var(--bimsa-shadow);
}

.bimsa-hero::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  background-image:
    linear-gradient(var(--bimsa-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--bimsa-border) 1px, transparent 1px);
  background-size: 2.5rem 2.5rem;
  opacity: 0.35;
  content: "";
  mask-image: linear-gradient(to bottom right, black, transparent 72%);
}

.bimsa-eyebrow {
  display: inline-flex;
  padding: 0.35rem 0.7rem;
  color: var(--bimsa-accent-secondary);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--bimsa-glass-bg);
  border: 1px solid var(--bimsa-border);
  border-radius: 999px;
}

.md-typeset .bimsa-hero h1 {
  max-width: 12ch;
  margin: 0.65rem 0 0.35rem;
  font-size: clamp(2.5rem, 6vw, 4.6rem);
  line-height: 1.02;
  background: linear-gradient(115deg, var(--bimsa-text) 25%, var(--bimsa-accent) 68%, var(--bimsa-accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.bimsa-hero__lead {
  margin: 0;
  color: var(--bimsa-text);
  font-size: clamp(1.05rem, 2vw, 1.45rem);
  font-weight: 650;
}

.bimsa-hero__copy {
  max-width: 38rem;
  margin: 0.7rem 0 1.25rem;
  color: var(--bimsa-text-muted);
  font-size: 0.92rem;
}

.bimsa-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.md-typeset .bimsa-hero .md-button {
  margin: 0;
  border-color: var(--bimsa-border);
  border-radius: 0.65rem;
}

.md-typeset .bimsa-hero .md-button--primary {
  color: white;
  background: linear-gradient(120deg, var(--bimsa-accent), var(--bimsa-accent-secondary));
  border-color: transparent;
}

.bimsa-disclaimer {
  margin: 1.15rem 0 0;
  color: var(--bimsa-text-muted);
  font-size: 0.68rem;
}

.bimsa-hero__visual {
  position: relative;
  min-height: 17rem;
  background: var(--bimsa-sidebar-bg);
  border: 1px solid var(--bimsa-border);
  border-radius: 50% 42% 48% 40%;
  box-shadow: inset 0 0 5rem var(--bimsa-hero-blue), var(--bimsa-shadow);
  backdrop-filter: blur(var(--bimsa-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--bimsa-blur)) saturate(140%);
}

.bimsa-formula {
  position: absolute;
  z-index: 2;
  padding: 0.7rem 0.9rem;
  color: var(--bimsa-text);
  background: var(--bimsa-surface-bg);
  background: var(--bimsa-glass-bg);
  border: 1px solid var(--bimsa-border);
  border-radius: 0.7rem;
  box-shadow: var(--bimsa-shadow);
}

.bimsa-formula--main {
  top: 33%;
  left: 9%;
  font-size: 1rem;
}

.bimsa-formula--small {
  right: 5%;
  bottom: 18%;
  color: var(--bimsa-text-muted);
  font-size: 0.76rem;
}

.bimsa-orbit {
  position: absolute;
  border: 1px solid var(--bimsa-accent-secondary);
  border-radius: 50%;
  opacity: 0.42;
}

.bimsa-orbit--one {
  inset: 17% 8%;
  transform: rotate(24deg);
}

.bimsa-orbit--two {
  inset: 8% 28%;
  transform: rotate(-34deg);
}

/* Repository-derived status strip. */
.bimsa-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0 0 2.8rem;
  background: var(--bimsa-glass-bg);
  border: 1px solid var(--bimsa-border);
  border-radius: var(--bimsa-radius);
  box-shadow: var(--bimsa-shadow);
}

.bimsa-stats > div {
  display: grid;
  gap: 0.12rem;
  padding: 0.9rem 1rem;
  text-align: center;
}

.bimsa-stats > div + div {
  border-left: 1px solid var(--bimsa-border);
}

.bimsa-stats strong {
  color: var(--bimsa-text);
  font-size: 1.15rem;
}

.bimsa-stats span {
  color: var(--bimsa-text-muted);
  font-size: 0.68rem;
}

/* Fully clickable glass entry cards. */
.bimsa-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 1rem 0 2.5rem;
}

.bimsa-home-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  width: 100%;
  margin: 1.5rem 0 2rem;
  align-items: stretch;
}

.bimsa-home-card-grid > * {
  min-width: 0;
  height: 100%;
  margin: 0;
}

.bimsa-home-card-grid > p {
  display: contents;
}

.bimsa-home-card-grid .bimsa-card {
  box-sizing: border-box;
  width: 100%;
  height: 100%;
  margin: 0;
}

.md-typeset .bimsa-card {
  display: flex;
  flex-direction: column;
  min-height: 12rem;
  padding: 1.2rem;
  color: var(--bimsa-text);
  background: var(--bimsa-surface-bg);
  background: linear-gradient(145deg, var(--bimsa-glass-bg), var(--bimsa-sidebar-bg));
  border: 1px solid var(--bimsa-border);
  border-radius: var(--bimsa-radius);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.md-typeset .bimsa-card:hover,
.md-typeset .bimsa-card:focus-visible {
  color: var(--bimsa-text);
  border-color: color-mix(in srgb, var(--bimsa-accent) 45%, transparent);
  box-shadow: var(--bimsa-shadow);
  transform: translateY(-2px);
}

.bimsa-card__icon {
  display: inline-flex;
  width: 2.25rem;
  height: 2.25rem;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
  color: var(--bimsa-accent);
  background: var(--bimsa-hero-blue);
  border-radius: 0.6rem;
}

.bimsa-card__icon .twemoji,
.bimsa-card__icon svg {
  width: 1.25rem;
  height: 1.25rem;
}

.bimsa-card strong {
  margin-bottom: 0.35rem;
  font-size: 0.92rem;
}

.bimsa-card > span:not(.bimsa-card__icon) {
  color: var(--bimsa-text-muted);
  line-height: 1.6;
}

.bimsa-card small {
  margin-top: 0.65rem;
  color: var(--bimsa-text-muted);
}

.bimsa-card b {
  margin-top: auto;
  padding-top: 0.8rem;
  color: var(--bimsa-accent);
  font-size: 0.72rem;
}

.bimsa-paths {
  padding: 1rem 1.25rem;
  background: var(--bimsa-glass-bg);
  border: 1px solid var(--bimsa-border);
  border-radius: var(--bimsa-radius);
}

/* Tables remain readable without forcing document-wide overflow. */
.md-typeset__table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
}

.md-typeset table:not([class]) {
  display: table;
  min-width: 36rem;
  background: var(--bimsa-surface-bg);
  border: 1px solid var(--bimsa-border);
}

.md-typeset table:not([class]) th {
  color: var(--bimsa-text);
  background: var(--bimsa-sidebar-bg);
}

/* Responsive collapse: Material controls navigation drawers below desktop. */
@media screen and (max-width: 60rem) {
  .bimsa-hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .bimsa-hero__visual {
    min-height: 12rem;
  }

  .bimsa-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .bimsa-home-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media screen and (max-width: 44.9844em) {
  .md-typeset {
    font-size: 0.78rem;
    line-height: 1.7;
  }

  .bimsa-hero {
    gap: 1.5rem;
    margin-top: 0;
    padding: 1.4rem;
    border-radius: 1rem;
  }

  .md-typeset .bimsa-hero h1 {
    font-size: clamp(2.15rem, 13vw, 3rem);
  }

  .bimsa-hero__visual {
    display: none;
  }

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

  .bimsa-stats > div + div {
    border-left: 0;
  }

  .bimsa-stats > div:nth-child(even) {
    border-left: 1px solid var(--bimsa-border);
  }

  .bimsa-stats > div:nth-child(n + 3) {
    border-top: 1px solid var(--bimsa-border);
  }

  .bimsa-card-grid {
    grid-template-columns: 1fr;
  }
}

@media screen and (max-width: 40rem) {
  .bimsa-home-card-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .bimsa-card {
    transition: none;
  }
}