/*
 * obsidian-brain · hero section (landing page only)
 *
 * Consumes tokens from theme.css. Styles only elements under .ob-hero.
 */

.ob-hero {
  position: relative;
  background: var(--ob-vellum);
  border-bottom: 1px solid var(--ob-rule);
  overflow: hidden;
}

[data-md-color-scheme="default"] .ob-hero {
  background:
    radial-gradient(720px 360px at 88% 0%, rgba(91, 60, 136, 0.07), transparent 60%),
    var(--ob-vellum);
}

[data-md-color-scheme="slate"] .ob-hero {
  background:
    radial-gradient(720px 360px at 88% 0%, rgba(182, 155, 224, 0.09), transparent 60%),
    var(--ob-vellum);
}

.ob-hero__inner {
  position: relative;
  max-width: 72rem;
  margin: 0 auto;
  padding: 5rem 1.5rem 5.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 3rem;
  align-items: center;
}

@media (max-width: 960px) {
  .ob-hero__inner {
    grid-template-columns: 1fr;
    padding: 3.25rem 1.25rem 3.75rem;
    gap: 2rem;
  }
}

/* ── Eyebrow ──────────────────────────────────────────────────────────── */
.ob-hero__eyebrow {
  font-family: var(--ob-font-mono);
  font-size: var(--ob-text-2xs);
  letter-spacing: var(--ob-tracking-eyebrow);
  text-transform: uppercase;
  color: var(--ob-ink-soft);
  margin: 0 0 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.ob-hero__eyebrow::before {
  content: "";
  display: inline-block;
  width: 1.75rem;
  height: 1px;
  background: currentColor;
  opacity: 0.55;
}

/* ── Title ────────────────────────────────────────────────────────────── */
.ob-hero__title {
  font-family: var(--ob-font-display);
  font-weight: 400;
  font-size: var(--ob-display-md);
  line-height: 1.02;
  letter-spacing: -0.022em;
  color: var(--ob-ink);
  margin: 0 0 1.5rem;
  font-variation-settings: "opsz" 144, "SOFT" 100;
}

.ob-hero__title em {
  font-style: italic;
  color: var(--ob-violet);
  font-variation-settings: "opsz" 144, "SOFT" 100;
}

/* ── Lede ─────────────────────────────────────────────────────────────── */
.ob-hero__lede {
  font-family: var(--ob-font-body);
  font-size: var(--ob-text-lg);
  line-height: 1.55;
  color: var(--ob-ink-soft);
  margin: 0 0 2rem;
  max-width: 34rem;
}

/* ── CTAs ─────────────────────────────────────────────────────────────── */
.ob-hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.ob-hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  font-family: var(--ob-font-body);
  font-size: var(--ob-text-sm);
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  border-radius: 0; /* deliberate: no rounded corners */
  transition: transform 150ms ease, background 150ms ease,
              color 150ms ease, border-color 150ms ease;
}

.ob-hero__cta--primary {
  background: var(--ob-violet);
  color: #FFF9EE;
  border: 1px solid var(--ob-violet);
}

.ob-hero__cta--primary:hover,
.ob-hero__cta--primary:focus-visible {
  background: var(--ob-violet-deep);
  border-color: var(--ob-violet-deep);
  color: #FFF9EE;
  transform: translateY(-1px);
}

.ob-hero__cta--secondary {
  background: transparent;
  color: var(--ob-ink);
  border: 1px solid var(--ob-ink);
}

.ob-hero__cta--secondary:hover,
.ob-hero__cta--secondary:focus-visible {
  background: var(--ob-ink);
  color: var(--ob-vellum);
  transform: translateY(-1px);
}

.ob-hero__cta-icon {
  width: 1rem;
  height: 1rem;
}

/* ── Shell snippet ────────────────────────────────────────────────────── */
.ob-hero__shell {
  background: transparent;
  border: 1px solid var(--ob-rule);
  padding: 0.85rem 1rem;
  margin: 0;
  font-family: var(--ob-font-mono);
  font-size: var(--ob-text-xs);
  color: var(--ob-ink);
  overflow-x: auto;
  max-width: 28rem;
  line-height: 1.4;
}

.ob-hero__shell code {
  font-family: inherit;
  color: inherit;
  background: transparent;
  padding: 0;
}

.ob-hero__prompt {
  color: var(--ob-berry);
  margin-right: 0.6rem;
  user-select: none;
}

/* ── Graphic ──────────────────────────────────────────────────────────── */
.ob-hero__graphic {
  position: relative;
  color: var(--ob-violet);
}

.ob-hero__graphic svg {
  width: 100%;
  max-width: 520px;
  height: auto;
  display: block;
  margin: 0 auto;
}

@keyframes ob-node-pulse {
  0%, 100% { transform: scale(1);   opacity: 0.85; }
  50%      { transform: scale(1.25); opacity: 1;   }
}

.ob-graph__node {
  transform-box: fill-box;
  transform-origin: center;
  animation: ob-node-pulse 6s ease-in-out infinite;
}

.ob-graph__node:nth-of-type(1) { animation-delay: 0s;   }
.ob-graph__node:nth-of-type(2) { animation-delay: 0.8s; }
.ob-graph__node:nth-of-type(3) { animation-delay: 1.6s; }
.ob-graph__node:nth-of-type(4) { animation-delay: 2.4s; }
.ob-graph__node:nth-of-type(5) { animation-delay: 3.2s; }
.ob-graph__node:nth-of-type(6) { animation-delay: 4.0s; }

.ob-graph__node--center {
  animation: none;
}

.ob-graph__node--outer {
  opacity: 0.55;
  animation-duration: 8s;
}

@keyframes ob-edge-draw {
  from { stroke-dasharray: 0 320;   opacity: 0;    }
  to   { stroke-dasharray: 320 0;   opacity: 0.55; }
}

.ob-graph__edges path {
  stroke-dasharray: 320;
  animation: ob-edge-draw 2.2s ease-out forwards;
}

.ob-graph__edges path:nth-child(2) { animation-delay: 0.25s; }
.ob-graph__edges path:nth-child(3) { animation-delay: 0.50s; }
.ob-graph__edges path:nth-child(4) { animation-delay: 0.75s; }
.ob-graph__edges path:nth-child(5) { animation-delay: 1.00s; }

@media (prefers-reduced-motion: reduce) {
  .ob-graph__node,
  .ob-graph__edges path {
    animation: none;
    stroke-dasharray: none;
    opacity: 0.6;
  }
}

/* ── Marginalia: right-edge latitude ticks ────────────────────────────── */
.ob-hero__margin {
  position: absolute;
  right: 1.25rem;
  top: 5rem;
  bottom: 5rem;
  width: 1.1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  pointer-events: none;
}

.ob-hero__margin span {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--ob-rule);
}

.ob-hero__margin span:nth-child(odd)  { width: 55%; }
.ob-hero__margin span:nth-child(even) { width: 85%; }

@media (max-width: 960px) {
  .ob-hero__margin { display: none; }
}