:root {
  --ac-bg: #020617;
  --ac-bg-alt: #020617;
  --ac-surface: #020617;
  --ac-surface-alt: #020617;
  --ac-text: #e5e7eb;
  --ac-muted: #9ca3af;
  --ac-accent: #22d3ee;
  --ac-accent-soft: #0ea5e9;
  --ac-border: #1f2937;
  --ac-shadow: 0 18px 45px rgba(15, 23, 42, 0.85);
}

/* Global layout */

body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  background-color: var(--ac-bg);
  color: var(--ac-text);
}

.page-shell {
  min-height: 100vh;
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.12), transparent 55%),
              radial-gradient(circle at bottom, rgba(244, 63, 94, 0.12), transparent 55%),
              #020617;
  color: var(--ac-text);
}

/* Header & nav */

.site-header {
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
  backdrop-filter: blur(18px);
  background: linear-gradient(to right, rgba(15, 23, 42, 0.96), rgba(30, 64, 175, 0.96));
  box-shadow: var(--ac-shadow);
}

.site-header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-lockup span {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ac-muted);
}

.brand-lockup strong {
  display: block;
  font-size: 1rem;
  font-weight: 600;
}

.segment-pill {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: rgba(15, 23, 42, 0.85);
  font-size: 0.8rem;
  color: var(--ac-muted);
}

/* Nav */

.main-nav a {
  margin-left: 10px;
  font-size: 0.9rem;
  text-decoration: none;
  color: #e5e7eb;
  opacity: 0.8;
}

.main-nav a:hover {
  opacity: 1;
}

.main-nav a.active {
  color: #22d3ee;
  border-bottom: 2px solid #22d3ee;
}


/* Nav groups & dropdowns */

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.nav-group {
  position: relative;
}

.nav-group-label {
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: rgba(15, 23, 42, 0.88);
  padding: 4px 10px;
  font-size: 0.82rem;
  line-height: 1.3;
  color: var(--ac-muted);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.nav-group-label .nav-chevron {
  font-size: 0.7rem;
  opacity: 0.7;
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 220px;
  max-width: 260px;
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: rgba(15, 23, 42, 0.98);
  box-shadow: var(--ac-shadow);
  padding: 6px 0;
  display: none;
  z-index: 50;
}

.nav-dropdown li {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-dropdown a {
  display: block;
  padding: 6px 12px;
  font-size: 0.8rem;
  color: var(--ac-text);
  text-decoration: none;
  opacity: 0.85;
}

.nav-dropdown a:hover {
  opacity: 1;
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.18), rgba(15, 23, 42, 1));
}

/* Show dropdown on hover/focus */

.nav-group:hover .nav-dropdown,
.nav-group:focus-within .nav-dropdown {
  display: block;
}

/* Mobile nav stacking */

@media (max-width: 768px) {
  .site-header-inner {
    align-items: flex-start;
  }

  .main-nav {
    width: 100%;
    margin-top: 10px;
    flex-wrap: wrap;
  }
}

/* Main content */

.page-main {
  max-width: 1120px;
  margin: 32px auto 48px auto;
  padding: 0 24px 40px 24px;
}

.segment.section-intro > h1 {
  font-size: 1.9rem;
  margin-bottom: 0.5rem;
}

.lede {
  max-width: 720px;
  color: var(--ac-muted);
  font-size: 1.02rem;
}

/* Panels & sections */

.panel {
  margin-top: 20px;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: radial-gradient(circle at top left, rgba(34, 211, 238, 0.06), transparent 42%),
              radial-gradient(circle at bottom right, rgba(244, 63, 94, 0.06), transparent 42%),
              rgba(15, 23, 42, 0.95);
  box-shadow: var(--ac-shadow);
}

.panel-outline h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

.section-content {
  margin-top: 24px;
}

/* Links */

a,
a:visited {
  color: #38bdf8;
}

a:hover,
a:focus {
  color: #7dd3fc;
}


/* Content link overrides for readability on dark backgrounds */

.segment-content a,
.section-content a,
.panel a,
.panel-body a,
.lede a,
.fm-content a {
  color: #38bdf8 !important;
}

.segment-content a:hover,
.segment-content a:focus,
.section-content a:hover,
.section-content a:focus,
.panel a:hover,
.panel a:focus,
.panel-body a:hover,
.panel-body a:focus,
.lede a:hover,
.lede a:focus,
.fm-content a:hover,
.fm-content a:focus {
  color: #7dd3fc !important;
}

/* Lists */

ul {
  padding-left: 1.1rem;
}

/* Notes */

.note {
  display: block;
  font-size: 0.82rem;
  color: var(--ac-muted);
  margin-top: 4px;
}

/* Simple footer spacing */
.ac-footnote {
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--ac-muted);
}