/* ============================================================
   Ai-Revolution — Base layer
   Reset, document defaults, and core utility classes
   (Liquid Glass material, gradient text, brand surfaces).
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  font-weight: var(--body-weight);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01" off;
}

/* Brand background: subtle blurred glow image, fixed under content */
.ar-bg {
  background-color: var(--bg);
  background-image: var(--bg-image);
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
}

h1, h2, h3, h4 {
  color: var(--heading);
  font-weight: var(--heading-weight);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-snug);
  text-wrap: balance;
}

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); }

::selection { background: rgba(29,132,223,0.22); }

/* ---- Display headline helper ---- */
.ar-display {
  font-family: var(--font-display);
  font-weight: var(--display-weight);
  letter-spacing: var(--tracking-tighter);
  line-height: var(--leading-tight);
  text-wrap: balance;
}

/* ---- Eyebrow / label ---- */
.ar-eyebrow {
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--accent);
}

/* ---- Gradient text (uses theme-aware --gradient-text) ---- */
.ar-gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.ar-gradient-brand-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

/* =========================================================
   LIQUID GLASS material
   ========================================================= */
.glass {
  position: relative;
  background: var(--glass-tint);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  border: 1px solid var(--glass-edge-low);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  isolation: isolate;
}
/* specular sheen — bright highlight pooled at the top edge */
.glass::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--glass-sheen);
  pointer-events: none;
  z-index: -1;
}
/* a crisp 1px top highlight that reads as the lit glass edge */
.glass::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(180deg, var(--glass-edge), transparent 60%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}
.glass-strong {
  background: var(--glass-tint-strong);
  backdrop-filter: blur(var(--glass-blur-strong)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur-strong)) saturate(var(--glass-saturate));
}
.glass-faint { background: var(--glass-tint-faint); }
.glass-pill  { border-radius: var(--radius-pill); }

/* graceful fallback when backdrop-filter is unsupported */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass { background: var(--glass-tint-strong); }
}

/* ---- Brand fill surface (gradient) ---- */
.ar-brand-fill {
  background: var(--gradient-brand);
  color: var(--on-brand);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}