/* ----------------------------------------------------------------------------
   OO-LD landing hero (docs/index.md)
   Full-bleed, centered hero in the style of zensical.org: logo + headline +
   short text passage + call-to-action buttons over a soft brand gradient.
---------------------------------------------------------------------------- */

/* The hero holds the content only; the gradient lives on .md-main (the
   full-height content region) so it is one continuous layer with no seam. */
.oold-hero {
  padding: 4.5rem 1rem 5rem;
  text-align: center;
}

.oold-hero__logo {
  width: 200px;
  max-width: 55%;
  height: auto;
  filter: drop-shadow(0 10px 28px rgba(0, 0, 0, 0.18));
}

.oold-hero__title {
  margin: 1.4rem 0 0.3rem;
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1.15;
}

.oold-hero__tagline {
  margin: 0 auto 1.2rem;
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--md-default-fg-color--light);
}

.oold-hero__text {
  max-width: 42rem;
  margin: 0 auto 2rem;
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--md-default-fg-color--light);
}

.oold-hero__actions .md-button {
  margin: 0.35rem 0.4rem;
}

/* The landing page is a short hero with no scrolling, so don't reserve the
   scrollbar gutter (the theme sets `scrollbar-gutter: stable` globally).
   Otherwise an empty strip shows on the right where scrolling pages put the
   scrollbar. */
html:has(.oold-hero) {
  scrollbar-gutter: auto;
}

/* OO-LD brand yellow + the gradient's end color. */
body:has(.oold-hero) {
  --oold-hero-yellow: #ffd43b;
  --oold-hero-end: color-mix(in srgb, var(--oold-hero-yellow) 60%, var(--md-default-bg-color));
}

/* One continuous gradient on the full-height content region: page background at
   the top (white/black), fading to brand yellow at the very bottom. Scoped to
   .md-main so the header, tabs and footer keep their own colors, and because
   .md-main flex-grows to the page bottom there is no seam and no gap. */
body:has(.oold-hero) .md-main {
  background:
    radial-gradient(
      70% 55% at 50% 100%,
      color-mix(in srgb, var(--oold-hero-yellow) 40%, transparent),
      transparent 72%
    ),
    linear-gradient(
      180deg,
      var(--md-default-bg-color) 30%,
      var(--oold-hero-end) 100%
    );
}

/* Landing page: hero starts flush under the tabs bar and spans the full width. */
body:has(.oold-hero) .md-main__inner {
  margin-top: 0;
  max-width: none;
}

body:has(.oold-hero) .md-content__inner {
  margin: 0;
  padding: 0;
}

/* Hide the footer on the landing page only (the page that carries the hero) */
body:has(.oold-hero) .md-footer {
  display: none;
}

/* ----------------------------------------------------------------------------
   Mermaid diagrams: render large and let oversized ones scroll/pan
---------------------------------------------------------------------------- */

.mermaid {
  /* Scroll to pan when a diagram is wider/taller than the content column.
     Combine with the browser's native zoom (Ctrl/Cmd +) for fine detail -
     SVG stays crisp at any zoom level. */
  overflow: auto;
  text-align: center;
}

.mermaid svg {
  /* Render at full content width instead of mermaid's smaller default */
  max-width: 100%;
  height: auto;
}

@media screen and (max-width: 44.9375em) {
  .oold-hero {
    padding: 3rem 1rem 3.5rem;
  }
  .oold-hero__title {
    font-size: 2rem;
  }
  .oold-hero__tagline {
    font-size: 1.1rem;
  }
}