/* US Energy Map — shared brand styles for marketing pages (light theme) */

:root {
  --ink: #0f172a;
  --ink-2: #334155;
  --muted: #64748b;
  --bg: #ffffff;
  --bg-2: #f8fafc;
  --bg-3: #f1f5f9;
  --line: #e2e8f0;
  --brand: #2563eb;
  --brand-2: #06b6d4;
  --dc: #2563eb;
  --bess: #16a34a;
  --uc: #d97706;
  --pl: #9333ea;
  --midnight: #0b1224;
  --radius: 14px;
  --maxw: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { 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;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { display: block; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  height: 64px; display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; font-size: 17px; color: var(--ink); letter-spacing: 0.2px; }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  color: var(--ink-2); font-size: 14.5px; font-weight: 500;
  padding: 8px 12px; border-radius: 8px;
}
.nav-links a:hover { background: var(--bg-3); color: var(--ink); text-decoration: none; }
.nav-links a.cta {
  background: var(--brand); color: #fff; font-weight: 600;
  padding: 8px 16px; margin-left: 6px;
}
.nav-links a.cta:hover { background: #1d4ed8; }
.nav-toggle { display: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 15px; padding: 12px 22px;
  border-radius: 10px; border: 1px solid transparent; cursor: pointer;
  transition: all 0.15s ease;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: #1d4ed8; text-decoration: none; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); text-decoration: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background:
    radial-gradient(1100px 480px at 80% -10%, rgba(37,99,235,0.08), transparent 60%),
    radial-gradient(900px 400px at 0% 0%, rgba(6,182,212,0.07), transparent 55%),
    var(--bg);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.5;
  mask-image: radial-gradient(900px 500px at 70% 10%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(900px 500px at 70% 10%, #000 30%, transparent 75%);
}
.hero-inner { position: relative; max-width: var(--maxw); margin: 0 auto; padding: 88px 24px 76px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 600; letter-spacing: 0.5px; text-transform: uppercase;
  color: var(--brand); background: rgba(37,99,235,0.08);
  border: 1px solid rgba(37,99,235,0.18); border-radius: 999px; padding: 6px 14px;
  margin-bottom: 22px;
}
.eyebrow .pulse { width: 7px; height: 7px; border-radius: 50%; background: var(--bess); box-shadow: 0 0 0 3px rgba(22,163,74,0.18); }
h1.display {
  font-size: clamp(38px, 6vw, 64px); line-height: 1.04; font-weight: 800;
  letter-spacing: -1.5px; margin: 0 0 20px; max-width: 16ch;
}
h1.display .grad {
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede { font-size: clamp(17px, 2.2vw, 20px); color: var(--ink-2); max-width: 60ch; margin: 0 0 32px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- Stat strip ---------- */
.statbar {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; margin-top: 56px;
}
.statbar .stat { background: var(--bg); padding: 22px 24px; }
.statbar .num { font-size: clamp(26px, 3.4vw, 34px); font-weight: 800; letter-spacing: -0.5px; }
.statbar .num.dc { color: var(--dc); }
.statbar .num.bess { color: var(--bess); }
.statbar .num.mw { color: var(--brand-2); }
.statbar .num.st { color: var(--pl); }
.statbar .lbl { font-size: 13px; color: var(--muted); margin-top: 4px; }

/* ---------- Sections ---------- */
section { padding: 76px 0; }
section.alt { background: var(--bg-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { max-width: 720px; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(26px, 3.6vw, 36px); font-weight: 800; letter-spacing: -0.8px; margin: 0 0 14px; }
.section-head p { font-size: 17px; color: var(--ink-2); margin: 0; }
.kicker { font-size: 13px; font-weight: 700; letter-spacing: 0.8px; text-transform: uppercase; color: var(--brand); margin-bottom: 12px; }

/* ---------- Cards ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 24px; transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { border-color: #cbd5e1; transform: translateY(-2px); box-shadow: 0 10px 30px -16px rgba(15,23,42,0.25); }
.card .ic {
  width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center;
  margin-bottom: 16px; font-size: 20px;
}
.ic.blue { background: rgba(37,99,235,0.10); }
.ic.green { background: rgba(22,163,74,0.10); }
.ic.cyan { background: rgba(6,182,212,0.12); }
.ic.purple { background: rgba(147,51,234,0.10); }
.card h3 { font-size: 18px; font-weight: 700; margin: 0 0 8px; }
.card p { font-size: 15px; color: var(--ink-2); margin: 0; }

/* ---------- Prose (methodology / about) ---------- */
.prose { max-width: 760px; margin: 0 auto; }
.prose h1 { font-size: clamp(32px, 5vw, 46px); font-weight: 800; letter-spacing: -1px; margin: 0 0 8px; }
.prose .sub { font-size: 18px; color: var(--muted); margin: 0 0 40px; }
.prose h2 { font-size: 24px; font-weight: 800; letter-spacing: -0.4px; margin: 44px 0 14px; padding-top: 8px; }
.prose h3 { font-size: 18px; font-weight: 700; margin: 28px 0 8px; }
.prose p, .prose li { font-size: 16.5px; color: var(--ink-2); }
.prose ul { padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose code { background: var(--bg-3); border: 1px solid var(--line); border-radius: 5px; padding: 1px 6px; font-size: 14px; }
.callout {
  background: var(--bg-2); border: 1px solid var(--line); border-left: 4px solid var(--brand);
  border-radius: 10px; padding: 16px 20px; margin: 24px 0;
}
.callout p { margin: 0; font-size: 15.5px; }
.deftable { width: 100%; border-collapse: collapse; margin: 16px 0; }
.deftable th, .deftable td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); font-size: 15px; }
.deftable th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.3px; }
.badge.op { background: rgba(22,163,74,0.14); color: #15803d; }
.badge.uc { background: rgba(217,119,6,0.14); color: #b45309; }
.badge.pl { background: rgba(147,51,234,0.14); color: #7e22ce; }

/* ---------- CTA band ---------- */
.cta-band {
  background:
    radial-gradient(700px 300px at 85% 0%, rgba(56,189,248,0.14), transparent 60%),
    var(--midnight);
  border-radius: 18px; padding: 54px 48px; color: #e2e8f0;
  display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap;
}
.cta-band h2 { font-size: clamp(24px, 3.4vw, 32px); font-weight: 800; letter-spacing: -0.6px; margin: 0 0 8px; color: #fff; }
.cta-band p { margin: 0; color: #94a3b8; font-size: 16px; }
.cta-band .btn-primary { background: var(--brand); }
.cta-band .btn-primary:hover { background: #1d4ed8; }

/* ---------- Footer ---------- */
.footer { background: var(--midnight); color: #94a3b8; padding: 48px 0 40px; }
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer .brand { color: #e2e8f0; margin-bottom: 12px; }
.footer .tag { font-size: 14px; max-width: 38ch; }
.footer-cols { display: flex; gap: 56px; flex-wrap: wrap; }
.footer-col h4 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.6px; color: #64748b; margin: 0 0 12px; }
.footer-col a { display: block; color: #cbd5e1; font-size: 14.5px; margin: 7px 0; }
.footer-col a:hover { color: #fff; text-decoration: none; }
.footer-bottom { max-width: var(--maxw); margin: 32px auto 0; padding: 20px 24px 0; border-top: 1px solid #1e293b; font-size: 13px; color: #64748b; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .nav-links { gap: 2px; }
  .nav-links a:not(.cta) { display: none; }
  .statbar { grid-template-columns: 1fr 1fr; }
  .cta-band { padding: 38px 28px; }
  section { padding: 56px 0; }
}