:root {
  --primary: #1D4ED8;
  --primary-dark: #1E40AF;
  --navy: #0B1F4B;
  --panel: #F3F6FC;
  --line: #CBD5E1;
  --muted: #475569;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: #FFFFFF;
  color: var(--navy);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

img { max-width: 100%; height: auto; }

a { color: var(--primary); }
a:hover { color: var(--primary-dark); }

:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 10;
  padding: 10px 14px;
  background: var(--navy);
  color: #FFFFFF;
  border-radius: 6px;
}
.skip:focus { left: 8px; }

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* header and navigation (no JavaScript: items wrap, then stack on small screens) */
.site-header {
  background: #FFFFFF;
  border-bottom: 1px solid var(--line);
}

.bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand { display: inline-flex; line-height: 0; }

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav a {
  display: inline-block;
  padding: 6px 2px;
  color: var(--navy);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid transparent;
}
.nav a:hover { border-bottom-color: var(--primary); }
.nav a[aria-current="page"] { color: var(--primary); border-bottom-color: var(--primary); }

.btn {
  display: inline-block;
  padding: 12px 22px;
  background: var(--primary);
  color: #FFFFFF;
  border: 2px solid var(--primary);
  border-radius: 6px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
}
.btn:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #FFFFFF; }

.btn-outline { background: #FFFFFF; color: var(--primary); }
.btn-outline:hover { background: var(--panel); color: var(--primary-dark); }

.nav a.btn-nav {
  padding: 8px 16px;
  color: #FFFFFF;
  border: 2px solid var(--primary);
}
.nav a.btn-nav:hover { color: #FFFFFF; border-color: var(--primary-dark); }

.nav .nav-auth { margin-left: 10px; }
.nav a.nav-signin { padding: 9px 4px; font-weight: 600; }

/* content blocks */
.hero {
  background: var(--panel);
  padding: 56px 0 48px;
}
.hero h1 {
  max-width: 24ch;
  margin: 0 0 16px;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.15;
}
.lead {
  max-width: 62ch;
  margin: 0;
  color: var(--muted);
  font-size: 1.15rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

.section { padding-top: 48px; padding-bottom: 48px; }

.tiles, .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tile {
  padding: 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 4px solid var(--primary);
  border-radius: 8px;
}
.tile h2 { margin: 0 0 8px; font-size: 1.1rem; line-height: 1.3; }
.tile p { margin: 0; color: var(--muted); }

.strip {
  padding: 22px 0;
  background: var(--navy);
  color: #FFFFFF;
  text-align: center;
}
.strip p { margin: 0; font-weight: 600; }

.cta {
  padding: 48px 0;
  background: var(--panel);
  text-align: center;
}
.cta h2 { margin: 0; font-size: 1.5rem; line-height: 1.3; }
.cta .actions { justify-content: center; }

.prose { max-width: 760px; }
.prose h2 { margin: 32px 0 8px; font-size: 1.25rem; }
.prose p { margin: 0 0 16px; }
.prose .actions { margin: 24px 0; }

.list { margin: 0 0 16px; padding-left: 22px; }

/* footer */
.site-footer {
  padding: 28px 0;
  background: var(--navy);
  color: #FFFFFF;
}
.site-footer p { margin: 4px 0; }
.site-footer a { color: #FFFFFF; }

@media (max-width: 640px) {
  .bar { flex-direction: column; align-items: flex-start; }
  .nav { flex-direction: column; align-items: flex-start; width: 100%; gap: 0; }
  .nav li { width: 100%; }
  .nav a { display: block; padding: 10px 0; }
  .nav a.btn-nav { margin-top: 8px; padding: 12px 16px; }
  .nav .nav-auth { margin-left: 0; margin-top: 8px; }
  .nav a.nav-signin { padding: 12px 16px; color: var(--primary); background: #FFFFFF; border: 2px solid var(--primary); border-radius: 6px; text-align: center; }
  .nav a.btn-nav { text-align: center; }
  .actions .btn { width: 100%; }
  .hero { padding: 40px 0 32px; }
}