:root {
  --navy:    #0d2137;
  --navy-2:  #14304d;
  --blue:    #1467d0;
  --sky:     #7dd3fc;
  --bg:      #eef1f6;
  --surface: #ffffff;
  --border:  #dde3ea;
  --text:    #111827;
  --muted:   #6b7280;
  --radius:  14px;
  --shadow:  0 4px 20px rgba(13,33,55,0.08);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

/* ── Top nav ─────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 20px;
  height: 62px; padding: 0 28px;
  background: rgba(13,33,55,0.96);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}
.nav .brand {
  font-size: 19px; font-weight: 800; color: #fff;
  text-decoration: none; letter-spacing: -0.4px;
}
.nav .brand em { color: var(--sky); font-style: normal; }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 26px; }
.nav-links a {
  color: #c7d2e0; text-decoration: none; font-size: 14px; font-weight: 500;
  transition: color .15s;
}
.nav-links a:hover { color: #fff; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 14px; text-decoration: none;
  padding: 10px 20px; border-radius: 9px; cursor: pointer; border: none;
  transition: transform .12s, box-shadow .15s, background .15s;
}
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 4px 14px rgba(20,103,208,0.35); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(20,103,208,0.45); }
.btn-ghost { background: rgba(255,255,255,0.08); color: #fff; border: 1px solid rgba(255,255,255,0.22); }
.btn-ghost:hover { background: rgba(255,255,255,0.16); }
.btn-lg { padding: 14px 28px; font-size: 15px; border-radius: 11px; }
.nav-links .btn-primary { color: #fff; }

/* ── Hero ────────────────────────────────────────────────── */
.hero {
  position: relative;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(20,103,208,0.45), transparent 60%),
    radial-gradient(900px 500px at 0% 110%, rgba(125,211,252,0.18), transparent 55%),
    linear-gradient(160deg, var(--navy), var(--navy-2));
  color: #fff;
  padding: 84px 28px 92px;
  text-align: center;
  overflow: hidden;
}
.hero-eyebrow {
  display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: 0.6px;
  text-transform: uppercase; color: var(--sky);
  background: rgba(125,211,252,0.12); border: 1px solid rgba(125,211,252,0.25);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(32px, 5vw, 56px); font-weight: 800; letter-spacing: -1.2px;
  line-height: 1.08; max-width: 880px; margin: 0 auto 20px;
}
.hero h1 .accent { color: var(--sky); }
.hero p.sub {
  font-size: clamp(16px, 2.2vw, 20px); color: #c7d2e0;
  max-width: 620px; margin: 0 auto 34px;
}
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ── Stat band ───────────────────────────────────────────── */
.stats {
  max-width: 1040px; margin: -52px auto 0; position: relative; z-index: 5;
  background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow);
  display: grid; grid-template-columns: repeat(4, 1fr);
  padding: 26px 18px;
}
.stat { text-align: center; padding: 6px 10px; border-right: 1px solid var(--border); }
.stat:last-child { border-right: none; }
.stat-num { font-size: clamp(24px, 3.4vw, 34px); font-weight: 800; color: var(--navy); letter-spacing: -0.5px; }
.stat-label { font-size: 13px; color: var(--muted); margin-top: 4px; }

/* ── Section scaffold ────────────────────────────────────── */
.section { max-width: 1080px; margin: 0 auto; padding: 80px 28px; }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 48px; }
.section-head h2 { font-size: clamp(26px, 3.6vw, 36px); font-weight: 800; letter-spacing: -0.8px; }
.section-head p { color: var(--muted); font-size: 17px; margin-top: 12px; }

/* ── Feature cards ───────────────────────────────────────── */
.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.feature {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px; text-decoration: none; color: inherit; display: block;
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.feature:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #c3d0e0; }
.feature-icon {
  width: 46px; height: 46px; border-radius: 11px; display: grid; place-items: center;
  font-size: 22px; background: linear-gradient(150deg, var(--blue), #2a86f0);
  margin-bottom: 16px;
}
.feature h3 { font-size: 19px; font-weight: 700; margin-bottom: 8px; }
.feature p { color: var(--muted); font-size: 15px; }
.feature .arrow { color: var(--blue); font-weight: 600; font-size: 14px; margin-top: 14px; display: inline-block; }

/* ── How it works ────────────────────────────────────────── */
.how { background: var(--navy); color: #fff; }
.how .section-head h2 { color: #fff; }
.how .section-head p { color: #aebccb; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.step {
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.10);
  border-radius: var(--radius); padding: 24px;
}
.step-n {
  width: 30px; height: 30px; border-radius: 8px; background: var(--blue);
  display: grid; place-items: center; font-weight: 700; font-size: 14px; margin-bottom: 14px;
}
.step h4 { font-size: 16px; margin-bottom: 6px; }
.step p { color: #aebccb; font-size: 14px; }

/* ── Data sources ────────────────────────────────────────── */
.sources { text-align: center; }
.sources-list { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 8px; }
.source-chip {
  background: var(--surface); border: 1px solid var(--border); border-radius: 999px;
  padding: 10px 20px; font-weight: 600; font-size: 14px; color: var(--navy);
}
.source-chip span { color: var(--muted); font-weight: 400; }

/* ── Final CTA ───────────────────────────────────────────── */
.cta-band {
  background: linear-gradient(160deg, var(--blue), #0f4ea8);
  color: #fff; text-align: center; border-radius: 20px;
  max-width: 1080px; margin: 0 auto 80px; padding: 56px 28px;
}
.cta-band h2 { font-size: clamp(24px, 3.4vw, 34px); font-weight: 800; letter-spacing: -0.6px; }
.cta-band p { color: #dbe7fb; margin: 12px auto 28px; max-width: 520px; font-size: 17px; }
.cta-band .btn-primary { background: #fff; color: var(--blue); box-shadow: 0 6px 22px rgba(0,0,0,0.18); }
.cta-band .btn-primary:hover { background: #f1f5fb; }

/* ── Footer ──────────────────────────────────────────────── */
.footer {
  background: var(--navy); color: #94a6b8; padding: 40px 28px; text-align: center; font-size: 13px;
}
.footer .brand { font-size: 16px; font-weight: 800; color: #fff; text-decoration: none; }
.footer .brand em { color: var(--sky); font-style: normal; }
.footer a { color: #c7d2e0; text-decoration: none; }
.footer a:hover { color: #fff; }
.footer-row { margin-top: 14px; display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.footer-fine { margin-top: 18px; color: #6c7e90; line-height: 1.7; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 860px) {
  .stats { grid-template-columns: repeat(2, 1fr); gap: 10px 0; margin-top: -40px; }
  .stat:nth-child(2) { border-right: none; }
  .features { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .nav-links a:not(.btn) { display: none; }
  .steps { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
}