/* ==========================================================================
   Atlas Intelligence — Base styles & design tokens
   ========================================================================== */

@font-face {
  font-family: "Roboto";
  src: url("../assets/fonts/roboto-var.woff2") format("woff2");
  font-weight: 100 900;
  font-stretch: 100%;
  font-display: swap;
}

:root {
  /* Brand palette */
  --navy-950: #070e1c;
  --navy-900: #0b1426;   /* Midnight Navy */
  --navy-800: #102642;   /* Deep Blue */
  --navy-700: #17243a;   /* Slate */
  --navy-600: #1f3352;
  --navy-500: #2b4268;
  --blue-500: #2775f6;   /* Atlas Blue */
  --blue-400: #4f8ff8;
  --blue-300: #8fb7fb;
  --cyan-400: #4fcde4;   /* Cyan */
  --cyan-300: #8ae0ef;
  --cloud-50: #f5f8fc;   /* Cloud White */
  --cloud-100: #e9eff7;
  --cloud-200: #d6e0ee;
  --gray-400: #8a9ab3;
  --gray-500: #5f708c;
  --gray-600: #44546e;
  --white: #ffffff;

  /* Status */
  --ok: #34d399;
  --warn: #fbbf24;
  --alert: #f87171;
  --heat-1: #1e3a8a;
  --heat-2: #2775f6;
  --heat-3: #4fcde4;
  --heat-4: #fbbf24;
  --heat-5: #f97316;

  /* Semantic */
  --bg: var(--white);
  --bg-alt: var(--cloud-50);
  --text: #0f1b2f;
  --text-muted: #4a5a74;
  --border: #dbe3ee;
  --accent: var(--blue-500);

  /* Type */
  --font-sans: "Roboto", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  --font-display: "Roboto", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  --fs-xs: 0.78rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.3rem;
  --fs-xl: clamp(1.5rem, 1.2rem + 1.2vw, 2rem);
  --fs-2xl: clamp(1.9rem, 1.4rem + 2vw, 2.8rem);
  --fs-3xl: clamp(2.3rem, 1.6rem + 3vw, 3.9rem);

  /* Space & shape */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;
  --space-9: 6.5rem;
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 2px rgba(11, 20, 38, 0.06), 0 1px 3px rgba(11, 20, 38, 0.08);
  --shadow: 0 6px 24px rgba(11, 20, 38, 0.08), 0 2px 6px rgba(11, 20, 38, 0.06);
  --shadow-lg: 0 24px 60px rgba(11, 20, 38, 0.16);
  --glow: 0 0 0 1px rgba(79, 205, 228, 0.25), 0 10px 40px rgba(39, 117, 246, 0.25);

  --container: 1240px;
  --nav-h: 72px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--blue-400); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0 0 var(--space-4);
  font-weight: 700;
}
h1 { font-size: var(--fs-3xl); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-lg); letter-spacing: -0.01em; }
h4 { font-size: var(--fs-md); }
p { margin: 0 0 var(--space-4); }
ul, ol { margin: 0 0 var(--space-4); padding-left: 1.2rem; }
li { margin-bottom: 0.35rem; }

:focus-visible {
  outline: 3px solid var(--cyan-400);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem; top: -100px;
  z-index: 1000;
  padding: 0.75rem 1rem;
  background: var(--white);
  color: var(--navy-900);
  border-radius: var(--radius-sm);
  font-weight: 600;
  box-shadow: var(--shadow);
}
.skip-link:focus { top: 1rem; }

/* ---------- Layout ---------- */
.container {
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
}
.container--narrow { width: min(100% - 2.5rem, 860px); margin-inline: auto; }

.section { padding-block: var(--space-9); position: relative; }
.section--tight { padding-block: var(--space-8); }
.section--alt { background: var(--bg-alt); }
.section--dark {
  background: var(--navy-900);
  color: var(--cloud-100);
  --text: var(--cloud-50);
  --text-muted: #a9b8cf;
  --border: rgba(255, 255, 255, 0.1);
}
.section--dark h1, .section--dark h2, .section--dark h3, .section--dark h4 { color: var(--white); }
.section--deep {
  background: radial-gradient(1200px 600px at 80% -10%, rgba(39,117,246,0.28), transparent 60%),
              radial-gradient(900px 500px at -10% 110%, rgba(79,205,228,0.16), transparent 60%),
              var(--navy-900);
}

.grid { display: grid; gap: var(--space-5); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.split { display: grid; grid-template-columns: 1.05fr 1fr; gap: var(--space-8); align-items: center; }
.split--reverse > :first-child { order: 2; }
.stack > * + * { margin-top: var(--space-4); }

.section-head { max-width: 760px; margin-bottom: var(--space-7); }
.section-head--center { margin-inline: auto; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue-500);
  margin-bottom: var(--space-3);
}
.section--dark .eyebrow { color: var(--cyan-400); }
.eyebrow::before {
  content: ""; width: 18px; height: 2px; border-radius: 2px;
  background: currentColor;
}
.lead { font-size: var(--fs-md); color: var(--text-muted); line-height: 1.65; }
.muted { color: var(--text-muted); }
.small { font-size: var(--fs-sm); }
.center { text-align: center; }

/* Page hero (interior pages) */
.page-hero {
  position: relative;
  padding: calc(var(--nav-h) + var(--space-8)) 0 var(--space-8);
  background:
    radial-gradient(900px 500px at 85% 0%, rgba(39,117,246,0.35), transparent 60%),
    radial-gradient(700px 400px at 0% 100%, rgba(79,205,228,0.15), transparent 60%),
    var(--navy-900);
  color: var(--cloud-100);
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black, transparent 85%);
  pointer-events: none;
}
.page-hero > .container { position: relative; z-index: 1; }
.page-hero h1 { color: var(--white); max-width: 900px; }
.page-hero .lead { color: #b9c7dc; max-width: 720px; }
.page-hero .eyebrow { color: var(--cyan-400); }
.page-hero__grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: var(--space-7); align-items: center; }
.breadcrumb { font-size: var(--fs-sm); color: #8fa3c2; margin-bottom: var(--space-4); }
.breadcrumb a { color: #b9c7dc; text-decoration: none; }
.breadcrumb a:hover { color: var(--white); }

/* Prose */
.prose { max-width: 760px; }
.prose h2 { margin-top: var(--space-7); }
.prose h3 { margin-top: var(--space-6); }

/* Utility */
.mt-0 { margin-top: 0; } .mb-0 { margin-bottom: 0; }
.mt-4 { margin-top: var(--space-4); } .mt-6 { margin-top: var(--space-6); } .mt-7 { margin-top: var(--space-7); }
.flex { display: flex; } .wrap { flex-wrap: wrap; } .gap-3 { gap: var(--space-3); } .gap-4 { gap: var(--space-4); }
.items-center { align-items: center; }
.hidden { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* Sprite icons (<svg><use>) have no viewBox — give them a sensible default size */
svg:not([viewBox]) { width: 1.25em; height: 1.25em; flex-shrink: 0; }