/* EI Atlas brochure — shared styles
   Palette follows the app (Bootstrap primary) for visual consistency.
   Wordmark/name is set in HTML only, so it stays trivial to rebrand. */

:root {
  --brand: #0d6efd;
  --brand-dark: #0056b3;
  --brand-tint: #e7f1ff;
  --ink: #212529;
  --muted: #495057;
  --muted-2: #6c757d;
  --line: #dee2e6;
  --bg: #ffffff;
  --bg-soft: #f8f9fa;
  --bg-soft-2: #e9ecef;
  --radius: 12px;
  --maxw: 1080px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.2; color: var(--ink); }
h1 { font-size: clamp(2rem, 4.5vw, 3.1rem); letter-spacing: -.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); letter-spacing: -.01em; }
h3 { font-size: 1.15rem; }
p { color: var(--muted); }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Skip link for accessibility */
.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--brand); color: #fff; padding: 10px 16px; z-index: 100;
  border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

/* Focus visibility */
a:focus-visible, button:focus-visible, .btn:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 2px;
  border-radius: 6px;
}

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255, 255, 255, .9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800;
  font-size: 1.15rem; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand .mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  display: grid; place-items: center; color: #fff; font-weight: 800; font-size: .95rem;
}
.brand .name-sub { color: var(--muted-2); font-weight: 600; font-size: .85rem; }
.nav { display: flex; align-items: center; gap: 22px; }
.nav a { color: var(--muted); font-weight: 600; font-size: .95rem; }
.nav a:hover { color: var(--brand); text-decoration: none; }

/* Buttons */
.btn {
  display: inline-block; font-weight: 700; font-size: .98rem;
  padding: 12px 20px; border-radius: 10px; border: 1px solid transparent;
  cursor: pointer; transition: background .15s, border-color .15s, color .15s;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); text-decoration: none; color: #fff; }
.btn-ghost { background: #fff; color: var(--brand); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--brand); text-decoration: none; }
.nav .btn { padding: 9px 16px; }

/* Hero */
.hero {
  background:
    radial-gradient(1000px 400px at 85% -10%, var(--brand-tint), transparent 60%),
    linear-gradient(180deg, #fff 0%, var(--bg-soft) 100%);
  border-bottom: 1px solid var(--line);
}
.hero .wrap { padding: 72px 20px 80px; }
.hero .eyebrow {
  display: inline-block; font-weight: 700; font-size: .8rem; letter-spacing: .06em;
  text-transform: uppercase; color: var(--brand-dark);
  background: var(--brand-tint); padding: 6px 12px; border-radius: 999px; margin-bottom: 18px;
}
.hero h1 { max-width: 16ch; margin: 0 0 18px; }
.hero .lead { font-size: 1.2rem; max-width: 60ch; margin: 0 0 28px; color: var(--muted); }
.hero .cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.hero .note { margin-top: 16px; font-size: .9rem; color: var(--muted-2); }

/* Sections */
section { padding: 72px 0; }
.section-head { max-width: 62ch; margin: 0 0 40px; }
.section-head h2 { margin: 0 0 12px; }
.section-head p { font-size: 1.1rem; margin: 0; }
.soft { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

/* Audience cards */
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 8px; }
.card p { margin: 0; font-size: .98rem; }

/* Features */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.feature {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 20px;
  background: #fff;
}
.feature .ic {
  width: 40px; height: 40px; border-radius: 10px; background: var(--brand-tint);
  color: var(--brand-dark); display: grid; place-items: center; margin-bottom: 12px;
  font-size: 1.2rem;
}
.feature h3 { margin: 0 0 6px; font-size: 1.05rem; }
.feature p { margin: 0; font-size: .94rem; }

/* Trust */
.trust-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.trust-list li { display: flex; gap: 12px; align-items: flex-start; }
.trust-list .check {
  flex: 0 0 auto; width: 24px; height: 24px; border-radius: 50%;
  background: var(--brand); color: #fff; display: grid; place-items: center;
  font-size: .8rem; font-weight: 800; margin-top: 2px;
}
.trust-list strong { color: var(--ink); }
.trust-note { margin-top: 22px; font-size: .85rem; color: var(--muted-2);
  border-left: 3px solid var(--line); padding-left: 12px; }

/* CTA band */
.cta-band {
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: #fff; text-align: center; border-radius: 0;
}
.cta-band h2 { color: #fff; margin: 0 0 12px; }
.cta-band p { color: rgba(255,255,255,.9); font-size: 1.1rem; margin: 0 auto 24px; max-width: 56ch; }
.cta-band .btn-primary { background: #fff; color: var(--brand-dark); }
.cta-band .btn-primary:hover { background: var(--bg-soft-2); }

/* Footer */
.site-footer { background: var(--ink); color: #cbd3da; padding: 56px 0 32px; font-size: .95rem; }
.site-footer a { color: #e9ecef; }
.site-footer a:hover { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
.footer-grid h4 { color: #fff; font-size: .95rem; margin: 0 0 12px; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.site-footer .brand { color: #fff; margin-bottom: 12px; }
.site-footer .brand .name-sub { color: #adb5bd; }
.footer-about { max-width: 40ch; color: #adb5bd; }
.footer-bottom {
  border-top: 1px solid #343a40; padding-top: 20px; display: flex;
  justify-content: space-between; flex-wrap: wrap; gap: 10px; color: #adb5bd; font-size: .85rem;
}

/* Legal / document pages */
.doc { max-width: 780px; margin: 0 auto; padding: 56px 20px 80px; }
.doc h1 { margin: 0 0 6px; }
.doc .doc-meta { color: var(--muted-2); font-size: .9rem; margin: 0 0 8px; }
.doc .draft-flag {
  background: #fff8e1; border: 1px solid #ffe08a; color: #7a5b00;
  padding: 12px 16px; border-radius: 10px; font-size: .92rem; margin: 20px 0 32px;
}
.doc h2 { margin: 32px 0 10px; }
.doc p, .doc li { color: var(--muted); }
.doc a.back { display: inline-block; margin-bottom: 24px; font-weight: 600; }

/* Responsive */
@media (max-width: 900px) {
  .grid-3, .features { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav a:not(.btn) { display: none; }
  .grid-3, .grid-2, .features { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero .wrap { padding: 48px 20px 56px; }
  section { padding: 52px 0; }
}