:root {
  --navy: #0A1830;
  --blue: #1F6FEB;
  --white: #FFFFFF;
  --bg-light: #F2F6FB;
  --heading: #0F1E33;
  --body: #3E4E6B;
  --muted: #8A97B1;
  --border: #E2E9F5;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

/* one global reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--white);
  color: var(--body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--border);
}
.site-header-inner {
  max-width: 1200px; margin: 0 auto; padding: 10px 24px;
  display: flex; align-items: center; gap: 28px;
}
.site-logo { display: inline-flex; align-items: center; flex: 0 0 auto; }
.site-logo img { height: 58px; width: auto; display: block; }
.site-nav { display: flex; align-items: center; gap: 26px; margin-left: auto; }
.site-nav a {
  color: var(--navy); text-decoration: none;
  font-size: 15px; font-weight: 600; white-space: nowrap;
}
.site-nav a:hover { color: var(--blue); }
.site-nav a[aria-current="page"] { color: var(--blue); }
.site-nav-cta {
  flex: 0 0 auto;
  background: var(--blue); color: var(--white) !important;
  font-size: 15px; font-weight: 700; text-decoration: none;
  padding: 10px 22px; border-radius: 9px;
  box-shadow: 0 6px 18px rgba(31, 111, 235, 0.35);
}
.site-nav-cta:hover { background: #3B82F6; }
.nav-toggle {
  display: none; margin-left: auto;
  background: none; border: 0; cursor: pointer; padding: 8px;
}
.nav-toggle span {
  display: block; width: 24px; height: 2.5px; border-radius: 2px;
  background: var(--navy); margin: 5px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ---------- footer ---------- */
.site-footer { background: var(--white); border-top: 1px solid var(--border); }
.site-footer-inner {
  max-width: 1200px; margin: 0 auto; padding: 48px 24px 32px;
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px;
}
.sf-brand img { width: 210px; max-width: 60vw; display: block; margin-bottom: 14px; }
.sf-brand p { font-size: 14px; color: #5F6B87; max-width: 300px; }
.sf-h {
  font-size: 12px; font-weight: 700; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--navy); margin-bottom: 14px;
}
.sf-links a, .sf-contact a { color: var(--blue); text-decoration: none; font-weight: 600; }
.sf-links a:hover, .sf-contact a:hover { text-decoration: underline; }
.sf-links { display: flex; flex-direction: column; gap: 9px; font-size: 14.5px; }
.sf-contact { display: flex; flex-direction: column; gap: 9px; font-size: 14.5px; color: var(--body); }
.sf-bottom {
  border-top: 1px solid var(--border);
  padding: 18px 24px; text-align: center;
  font-size: 13px; color: var(--muted);
}

/* ---------- 404 ---------- */
.pia-404 { text-align: center; padding: 110px 24px; background: var(--bg-light); }
.pia-404 h1 { font-size: 56px; font-weight: 900; color: var(--navy); margin-bottom: 12px; }
.pia-404 p { font-size: 17px; color: var(--body); margin-bottom: 28px; }
.pia-404 a {
  display: inline-block; background: var(--blue); color: #fff;
  font-weight: 700; text-decoration: none; padding: 14px 32px; border-radius: 10px;
}

@media (max-width: 900px) {
  .site-nav {
    display: none;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--white); border-bottom: 1px solid var(--border);
    flex-direction: column; align-items: stretch; gap: 0; margin: 0;
    padding: 8px 0; box-shadow: 0 18px 30px rgba(10, 24, 48, 0.12);
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 13px 24px; font-size: 16px; border-top: 1px solid var(--bg-light); }
  .site-nav a:first-child { border-top: 0; }
  .site-header-inner { position: relative; }
  .site-nav-cta { margin-left: auto; }
  .nav-toggle { display: block; margin-left: 12px; }
  .site-footer-inner { grid-template-columns: 1fr; gap: 28px; padding: 40px 24px 28px; }
}
@media (max-width: 480px) {
  .site-logo img { height: 48px; }
  .site-nav-cta { padding: 9px 16px; font-size: 14px; }
  .pia-404 h1 { font-size: 42px; }
}

/* ---------- accessibility ---------- */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--navy); color: #fff; padding: 10px 18px;
  font-weight: 700; border-radius: 0 0 8px 0; text-decoration: none;
}
.skip-link:focus { left: 0; }
a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 3px solid var(--blue); outline-offset: 2px; border-radius: 4px;
}