:root {
  --background: 255 255 255;
  --surface: 246 247 251;
  --primary: 17 17 17;
  --secondary: 82 82 82;
  --border: 229 231 235;
  --accent: 79 70 229;
  /* institutional indigo */
}

.dark {
  --background: 9 9 11;
  --surface: 17 17 19;
  --primary: 244 244 245;
  --secondary: 161 161 170;
  --border: 39 39 42;
  /* subtle borders in dark mode */
  --accent: 79 70 229;
  /* same indigo in dark mode */
}

/* Base styles before Tailwind loads */
body {
  background-color: rgb(var(--background));
  color: rgb(var(--primary));
}

.bg-grid {
  background-image:
    linear-gradient(to right, rgb(var(--border) / 0.10) 1px, transparent 1px),
    linear-gradient(to bottom, rgb(var(--border) / 0.10) 1px, transparent 1px);
  background-size: 64px 64px;
}

.dark .bg-grid {
  background-image:
    linear-gradient(to right, rgb(var(--border) / 0.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgb(var(--border) / 0.22) 1px, transparent 1px);
}

.bg-noise {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='.18'/%3E%3C/svg%3E");
  background-size: 160px 160px;
}

/* === Chironte Global UI System === */
.bh-bg {
  position: relative;
  isolation: isolate;
  min-height: 100vh;
}

.bh-bg::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(1000px 650px at 18% 22%, rgb(var(--accent) / 0.26), transparent 62%),
    radial-gradient(850px 550px at 82% 78%, rgb(var(--accent) / 0.18), transparent 60%),
    linear-gradient(to bottom, rgb(var(--background) / 1), rgb(var(--background) / 1));
  filter: blur(18px) saturate(1.10);
}

.dark .bh-bg::before {
  background: radial-gradient(900px 600px at 20% 18%, rgb(var(--accent) / 0.14), transparent 60%),
    radial-gradient(800px 520px at 90% 85%, rgb(var(--accent) / 0.10), transparent 55%),
    linear-gradient(to bottom, rgb(var(--background) / 1), rgb(var(--background) / 1));
}


/* === Reveal Animations === */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s cubic-bezier(0.21, 0.45, 0.32, 0.9),
    transform 0.8s cubic-bezier(0.21, 0.45, 0.32, 0.9);
  pointer-events: none;
}

[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* Staggered delays */
[data-reveal-delay="100"] {
  transition-delay: 100ms;
}

[data-reveal-delay="200"] {
  transition-delay: 200ms;
}

[data-reveal-delay="300"] {
  transition-delay: 300ms;
}

[data-reveal-delay="400"] {
  transition-delay: 400ms;
}

[data-reveal-delay="500"] {
  transition-delay: 500ms;
}


/* === Chironte Premium Card (single source of truth) === */
.bh-card {
  border-radius: 18px;
  border: 1px solid rgb(var(--border) / 0.35);
  background: rgb(var(--surface) / 0.65);
  box-shadow: 0 1px 0 rgb(0 0 0 / 0.04), 0 12px 30px rgb(0 0 0 / 0.06);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease, background-color .22s ease;
}

.dark .bh-card {
  border-color: rgb(var(--border) / 0.45);
  background: rgb(var(--surface) / 0.55);
  box-shadow: 0 1px 0 rgb(255 255 255 / 0.03), 0 14px 34px rgb(0 0 0 / 0.38);
}

/* Increase specificity to override revealed state and ensure snappy transition */
.bh-card.revealed:hover,
.bh-card:hover {
  transform: translateY(-3px);
  border-color: rgb(var(--border) / 0.30);
  background: rgb(var(--surface) / 0.78);
  box-shadow: 0 0 0 1px rgb(var(--accent)), 0 24px 70px rgb(0 0 0 / 0.12);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease, background-color .22s ease;
}

.dark .bh-card.revealed:hover,
.dark .bh-card:hover {
  box-shadow: 0 0 0 1px rgb(var(--accent)), 0 28px 80px rgb(0 0 0 / 0.52);
}

/* Optional: internal link underline on hover */
.bh-card a.bh-link {
  display: inline-flex;
  gap: .5rem;
  align-items: center;

}