/* AI Assurance Training — charcoal + teal bento (distinct from sibling course sites) */
:root {
  --charcoal-950: #0a0c0e;
  --charcoal-900: #0e1114;
  --charcoal-800: #161b22;
  --charcoal-700: #1e2530;
  --charcoal-600: #2a3340;
  --ink: #e8eef2;
  --ink-soft: #b7c4ce;
  --ink-muted: #7d8d9a;
  --teal: #3dcdb4;
  --teal-bright: #5eead4;
  --emerald: #10b981;
  --emerald-deep: #059669;
  --panel: rgba(30, 37, 48, 0.72);
  --panel-solid: #1a212b;
  --line: rgba(61, 205, 180, 0.18);
  --line-strong: rgba(61, 205, 180, 0.45);
  --glow: 0 0 40px rgba(61, 205, 180, 0.12);
  --radius: 1.25rem;
  --radius-sm: 0.75rem;
  --font-sans: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", ui-monospace, monospace;
  --max: 1120px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(16, 185, 129, 0.14), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 0%, rgba(61, 205, 180, 0.1), transparent 50%),
    var(--charcoal-900);
  line-height: 1.55;
  min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--teal-bright); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: #fff; }
a:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip {
  position: absolute; left: -9999px; top: auto;
}
.skip:focus {
  left: 1rem; top: 1rem; z-index: 100;
  background: var(--charcoal-800); color: var(--ink);
  padding: .6rem 1rem; border: 1px solid var(--line-strong);
}

/* —— Header —— */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(14, 17, 20, 0.82);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  display: flex; align-items: center; gap: 0.75rem;
  text-decoration: none; color: var(--ink);
}
.brand-mark {
  width: 2.25rem; height: 2.25rem;
  border-radius: 0.65rem;
  background: var(--charcoal-800);
  border: 1.5px solid var(--line-strong);
  display: grid; place-items: center;
  color: var(--teal);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
}
.brand-text {
  display: flex; flex-direction: column; line-height: 1.15;
}
.brand-text strong {
  font-weight: 700; font-size: 1rem; letter-spacing: -0.02em;
}
.brand-text span {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--ink-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.nav {
  display: flex; flex-wrap: wrap; gap: 0.35rem 1rem;
  align-items: center;
}
.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}
.nav a:hover { color: var(--teal-bright); }
.nav .cta {
  background: linear-gradient(135deg, var(--emerald), var(--teal));
  color: var(--charcoal-950) !important;
  font-weight: 700;
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  text-decoration: none;
}
.nav .cta:hover { filter: brightness(1.08); color: var(--charcoal-950) !important; }

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
}

/* —— Hero —— */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 3.5rem 1.25rem 2rem;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 1rem;
}
.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.1;
  max-width: 18ch;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, var(--teal-bright), var(--emerald));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead {
  margin: 0 0 1.75rem;
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 38rem;
}
.hero-actions {
  display: flex; flex-wrap: wrap; gap: 0.75rem;
  margin-bottom: 2.5rem;
}
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.7rem 1.2rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s ease, filter 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--emerald), var(--teal));
  color: var(--charcoal-950);
}
.btn-primary:hover { color: var(--charcoal-950); filter: brightness(1.06); }
.btn-ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--teal); color: var(--teal-bright); }

/* —— Bento grid —— */
.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 0.85rem;
}
.tile {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem 1.4rem;
  box-shadow: var(--glow);
  backdrop-filter: blur(8px);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.tile:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}
.tile-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 0.55rem;
}
.tile h2, .tile h3 {
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  font-weight: 700;
}
.tile p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.tile a.tile-link {
  display: inline-block;
  margin-top: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--teal-bright);
}
.tile a.tile-link:hover { color: #fff; }

.span-7 { grid-column: span 7; }
.span-5 { grid-column: span 5; }
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.tile-accent {
  background: linear-gradient(145deg, rgba(16, 185, 129, 0.18), rgba(61, 205, 180, 0.06));
  border-color: var(--line-strong);
}
.tile-list {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}
.tile-list li {
  font-size: 0.9rem;
  color: var(--ink-soft);
  padding-left: 1rem;
  position: relative;
}
.tile-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.55em;
  width: 0.4rem; height: 0.4rem;
  border-radius: 50%;
  background: var(--emerald);
}

/* —— Section —— */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
}
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.section-head h2 {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  letter-spacing: -0.025em;
}
.section-head p {
  margin: 0;
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.role-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.65rem;
}
.role-chip {
  background: var(--panel-solid);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
  color: var(--ink-soft);
  text-decoration: none;
  transition: border-color 0.15s, color 0.15s;
}
.role-chip:hover {
  border-color: var(--teal);
  color: var(--teal-bright);
}

/* —— CTA band —— */
.cta-band {
  max-width: var(--max);
  margin: 1rem auto 3rem;
  padding: 0 1.25rem;
}
.cta-panel {
  border-radius: calc(var(--radius) + 0.25rem);
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(120deg, rgba(16, 185, 129, 0.2), transparent 55%),
    var(--charcoal-800);
  padding: 2rem 1.75rem;
  display: grid;
  gap: 1rem;
  align-items: center;
}
@media (min-width: 720px) {
  .cta-panel {
    grid-template-columns: 1fr auto;
  }
}
.cta-panel h2 {
  margin: 0 0 0.4rem;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}
.cta-panel p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 36rem;
}
.cta-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-muted);
  margin-top: 0.5rem !important;
}

/* —— Footer —— */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 1.25rem 2.5rem;
  background: var(--charcoal-950);
}
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 1.25rem;
}
@media (min-width: 720px) {
  .footer-inner {
    grid-template-columns: 1.4fr 1fr;
  }
}
.footer-inner p {
  margin: 0.35rem 0;
  color: var(--ink-muted);
  font-size: 0.88rem;
}
.footer-inner strong { color: var(--ink); }
.footer-links {
  display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem;
}
.footer-links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.88rem;
}
.footer-links a:hover { color: var(--teal-bright); }
.legal {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-muted);
  letter-spacing: 0.04em;
}

/* —— Privacy page —— */
.prose {
  max-width: 40rem;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}
.prose h1 { margin-top: 0; letter-spacing: -0.03em; }
.prose h2 { margin-top: 2rem; font-size: 1.15rem; color: var(--teal-bright); }
.prose p, .prose li { color: var(--ink-soft); }

/* —— Responsive —— */
@media (max-width: 860px) {
  .span-7, .span-5, .span-4, .span-6, .span-8 { grid-column: span 12; }
  .menu-toggle { display: inline-block; }
  .nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    padding: 0.5rem 0 0.75rem;
  }
  .nav.open { display: flex; }
  .header-inner { flex-wrap: wrap; }
}