/* Academy overlay: keep iEDA.ai (ai-site) look; only add train nav + hide noise. */

.ac-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--ai-line, rgba(255, 255, 255, 0.08));
  background: color-mix(in srgb, var(--ai-bg, #060b10) 88%, transparent);
  backdrop-filter: blur(14px);
}
.ac-nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
  min-height: 64px;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.ac-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  text-decoration: none;
  color: var(--ai-text, #edf2f7);
  flex-shrink: 0;
}
.ac-brand-mark {
  font-family: var(--ai-font-display, inherit);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}
.ac-brand-sub {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ai-accent, #a78bfa);
}
.ac-nav-links {
  display: flex;
  align-items: center;
  gap: 0.1rem;
  flex: 1;
  min-width: 0;
}
.ac-nav-links > a,
.ac-drop > .ac-drop-toggle,
a.ac-drop-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.48rem 0.72rem;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--ai-muted, #9aa4b2);
  font: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}
.ac-nav-links > a:hover,
.ac-drop > .ac-drop-toggle:hover,
.ac-nav-links > a.is-active,
.ac-drop.open > .ac-drop-toggle {
  color: var(--ai-text, #edf2f7);
  background: rgba(167, 139, 250, 0.08);
}
.ac-drop { position: relative; }
.ac-drop-panel {
  display: none;
  position: absolute;
  top: calc(100% + 0.4rem);
  left: 0;
  min-width: 240px;
  padding: 0.45rem;
  border: 1px solid var(--ai-line-strong, rgba(255, 255, 255, 0.14));
  border-radius: 12px;
  background: var(--ai-panel, #0d1520);
  box-shadow: var(--ai-shadow, 0 18px 40px rgba(0, 0, 0, 0.35));
  z-index: 30;
}
.ac-drop.open .ac-drop-panel,
.ac-drop:hover .ac-drop-panel { display: grid; gap: 0.15rem; }
.ac-drop-panel a {
  display: grid;
  gap: 0.1rem;
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
  text-decoration: none;
  color: inherit;
}
.ac-drop-panel a:hover { background: rgba(167, 139, 250, 0.08); }
.ac-drop-panel a strong {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--ai-text, #edf2f7);
}
.ac-drop-panel a span {
  font-size: 0.74rem;
  color: var(--ai-muted, #9aa4b2);
  font-weight: 500;
}
.ac-nav-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: auto;
  flex-shrink: 0;
}
.ac-nav-actions a,
.ac-nav-actions button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 0.7rem;
  border: 1px solid var(--ai-line, rgba(255, 255, 255, 0.08));
  border-radius: 999px;
  background: transparent;
  color: var(--ai-text, #edf2f7);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}
.ac-theme-btn {
  min-width: 36px;
  height: 34px;
  padding: 0 !important;
  font-size: 1.05rem !important;
  font-weight: 500 !important;
  line-height: 1;
  border-color: var(--ai-line-strong, rgba(255, 255, 255, 0.18)) !important;
  background: var(--ai-panel, rgba(15, 23, 42, 0.8)) !important;
}
.ac-theme-btn:hover {
  border-color: var(--ai-accent, #a78bfa) !important;
  background: rgba(167, 139, 250, 0.12) !important;
  color: var(--ai-text, #edf2f7);
}
.ac-nav-actions a.ac-back {
  background: var(--ai-accent, #a78bfa);
  border-color: transparent;
  color: #0b1020;
}
html[data-theme="light"] .ac-nav-actions a.ac-back {
  color: #fff;
}
html[data-theme="light"] .ac-drop-panel {
  background: var(--ai-panel-strong, #ffffff);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
}
html[data-theme="light"] .ac-catalog-card,
html[data-theme="light"] .ac-path-card,
html[data-theme="light"] .ac-track a,
html[data-theme="light"] .ac-pager a {
  background: var(--ai-panel-strong, #ffffff);
}
.ac-menu-btn { display: none; }

@media (max-width: 900px) {
  .ac-menu-btn { display: inline-flex; }
  .ac-nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem;
    background: var(--ai-panel, #0d1520);
    border-bottom: 1px solid var(--ai-line, rgba(255, 255, 255, 0.08));
  }
  .ac-nav-links.open { display: flex; }
  .ac-drop:hover .ac-drop-panel { display: none; }
  .ac-drop.open .ac-drop-panel {
    display: grid;
    position: static;
    box-shadow: none;
    border: 0;
    background: transparent;
    padding-left: 0.5rem;
  }
}

/* Hide product-marketing chrome on academy pages */
body.ac-body .ai-terminal,
body.ac-body .ai-marquee,
body.ac-body .ai-metrics,
body.ac-body .ai-cta,
body.ac-body .ai-inline-facts,
body.ac-body .ai-doc-meta,
body.ac-body .ai-flow,
body.ac-body .ai-track-board {
  display: none !important;
}

/* Match train/index.html (.ac-hero / .ac-section) spacing on catalog pages */
body.ac-body .ai-hero {
  padding-top: 3rem;
  padding-bottom: 1.5rem;
}
body.ac-body .ai-section {
  padding-top: 1.25rem;
  padding-bottom: 2rem;
}
body.ac-body .ai-hero.ai-doc-hero-lite,
body.ac-body .ai-doc-hero-lite.ai-hero {
  padding-top: 2.25rem;
  padding-bottom: 1.25rem;
}
body.ac-body .ai-doc-hero {
  padding: 2.5rem 0 1.25rem;
}
@media (max-width: 720px) {
  body.ac-body .ai-hero { padding-top: 2.5rem; }
}

/* Compact catalog cards → reuse ai-card language */
.ac-catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}
.ac-catalog-card {
  display: grid;
  gap: 0.45rem;
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--ai-line, rgba(255, 255, 255, 0.08));
  border-radius: 16px;
  background: var(--ai-panel, #0d1520);
  text-decoration: none;
  color: inherit;
  transition: 180ms ease;
}
.ac-catalog-card:hover {
  border-color: var(--ai-line-strong, rgba(255, 255, 255, 0.14));
  transform: translateY(-2px);
  box-shadow: var(--ai-shadow, 0 18px 40px rgba(0, 0, 0, 0.35));
}
.ac-catalog-card em {
  font-style: normal;
  font-family: var(--ai-font-mono, ui-monospace, monospace);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--ai-accent, #a78bfa);
}
.ac-catalog-card h3 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}
.ac-catalog-card p {
  margin: 0;
  color: var(--ai-muted, #9aa4b2);
  font-size: 0.88rem;
}

.ac-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: 1.25rem 0 0;
}
.ac-pager a {
  display: grid;
  gap: 0.2rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--ai-line, rgba(255, 255, 255, 0.08));
  border-radius: 14px;
  background: var(--ai-panel, #0d1520);
  text-decoration: none;
  color: inherit;
}
.ac-pager a:hover { border-color: var(--ai-accent, #a78bfa); }
.ac-pager a span {
  font-size: 0.7rem;
  color: var(--ai-muted, #9aa4b2);
  font-family: var(--ai-font-mono, ui-monospace, monospace);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.ac-pager a strong { font-size: 0.92rem; }
.ac-pager a.next { text-align: right; }
@media (max-width: 720px) {
  .ac-pager { grid-template-columns: 1fr; }
  .ac-pager a.next { text-align: left; }
}

.ac-footer {
  border-top: 1px solid var(--ai-line, rgba(255, 255, 255, 0.08));
  padding: 1.75rem 0 2rem;
  margin-top: 2rem;
}
.ac-footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  justify-content: space-between;
}
.ac-footer p {
  margin: 0.35rem 0 0;
  color: var(--ai-muted, #9aa4b2);
  font-size: 0.88rem;
  max-width: 28rem;
}
.ac-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.1rem;
}
.ac-footer-links a {
  color: var(--ai-text, #edf2f7);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
}
.ac-footer-links a:hover { color: var(--ai-accent, #a78bfa); }

/* Homepage helpers (train/index) */
.ac-main { padding-bottom: 2rem; }
.ac-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}
.ac-hero { padding: 3rem 0 1.5rem; }
.ac-eyebrow {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-family: var(--ai-font-mono, ui-monospace, monospace);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ai-accent, #a78bfa);
}
.ac-hero h1 {
  margin: 0 0 0.85rem;
  font-family: var(--ai-font-display, inherit);
  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.ac-lead {
  margin: 0 0 1.25rem;
  max-width: 36rem;
  color: var(--ai-muted, #9aa4b2);
  font-size: 1.05rem;
}
.ac-actions { display: flex; flex-wrap: wrap; gap: 0.65rem; }
.ac-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.65rem 1.05rem;
  border-radius: 999px;
  border: 1px solid var(--ai-line-strong, rgba(255, 255, 255, 0.14));
  background: transparent;
  color: var(--ai-text, #edf2f7);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
}
.ac-btn.primary {
  background: var(--ai-accent, #a78bfa);
  border-color: transparent;
  color: #0b1020;
}
.ac-section { padding: 1.25rem 0 2rem; }
.ac-section h2 {
  margin: 0 0 0.4rem;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}
.ac-sec-lead {
  margin: 0 0 1.25rem;
  color: var(--ai-muted, #9aa4b2);
  max-width: 40rem;
}
.ac-path-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
@media (max-width: 720px) {
  .ac-path-grid { grid-template-columns: 1fr; }
}
.ac-path-card {
  display: grid;
  gap: 0.45rem;
  padding: 1.2rem 1.25rem;
  border: 1px solid var(--ai-line, rgba(255, 255, 255, 0.08));
  border-radius: 16px;
  background: var(--ai-panel, #0d1520);
  text-decoration: none;
  color: inherit;
}
.ac-path-card:hover { border-color: var(--ai-accent, #a78bfa); }
.ac-path-card .ac-num {
  font-family: var(--ai-font-mono, ui-monospace, monospace);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--ai-muted, #9aa4b2);
}
.ac-path-card h3 { margin: 0; font-size: 1.15rem; }
.ac-path-card p { margin: 0; color: var(--ai-muted, #9aa4b2); font-size: 0.9rem; }
.ac-path-card .ac-go {
  margin-top: 0.2rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ai-accent, #a78bfa);
}
.ac-track { display: grid; gap: 0.55rem; margin-top: 0.75rem; }
.ac-track a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--ai-line, rgba(255, 255, 255, 0.08));
  border-radius: 12px;
  background: var(--ai-panel, #0d1520);
  text-decoration: none;
  color: inherit;
}
.ac-track a:hover { border-color: var(--ai-accent, #a78bfa); }
.ac-track a strong { font-size: 0.95rem; }
.ac-track a span {
  color: var(--ai-muted, #9aa4b2);
  font-size: 0.78rem;
  font-family: var(--ai-font-mono, ui-monospace, monospace);
}