/* ─── Reset & base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:    #115bab;
  --blue-d:  #0d4a8a;
  --blue-l:  #1a6fc4;
  --ink:     #1a1a2e;
  --ink-75:  #3d3d54;
  --ink-50:  #6e6e82;
  --surface: #f7f8fa;
  --white:   #ffffff;
  --radius:  8px;
  --max-w:   1080px;
  --serif:   'Source Serif 4', Georgia, serif;
  --sans:    'Inter', system-ui, -apple-system, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }

/* ─── Layout ─── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.container--narrow { max-width: 720px; }

/* ─── Nav ─── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background .3s, box-shadow .3s;
}
.nav--solid {
  background: rgba(255,255,255,.97);
  box-shadow: 0 1px 3px rgba(0,0,0,.08);
}
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.nav__brand { display: flex; align-items: center; }
.nav__logo { height: 36px; width: auto; }
.nav__links {
  list-style: none; display: flex; gap: 2rem;
}
.nav__links a {
  text-decoration: none; font-size: .9rem; font-weight: 500;
  color: var(--white); transition: opacity .2s;
}
.nav--solid .nav__links a { color: var(--ink); }
.nav__links a:hover { opacity: .7; }

/* Mobile nav */
.nav__toggle {
  display: none; background: none; border: none; cursor: pointer;
  width: 28px; height: 20px; position: relative; z-index: 110;
}
.nav__toggle span {
  display: block; width: 100%; height: 2px; background: var(--white);
  position: absolute; left: 0; transition: all .25s;
}
.nav--solid .nav__toggle span { background: var(--ink); }
.nav__toggle span:nth-child(1) { top: 0; }
.nav__toggle span:nth-child(2) { top: 9px; }
.nav__toggle span:nth-child(3) { top: 18px; }
.nav__toggle.open span:nth-child(1) { top: 9px; transform: rotate(45deg); }
.nav__toggle.open span:nth-child(2) { opacity: 0; }
.nav__toggle.open span:nth-child(3) { top: 9px; transform: rotate(-45deg); }

@media (max-width: 640px) {
  .nav__toggle { display: block; }
  .nav__links {
    position: fixed; top: 0; right: 0; width: 260px; height: 100vh;
    flex-direction: column; gap: 0; padding: 80px 2rem 2rem;
    background: var(--white); box-shadow: -4px 0 24px rgba(0,0,0,.12);
    transform: translateX(100%); transition: transform .3s;
  }
  .nav__links.open { transform: translateX(0); }
  .nav__links a { color: var(--ink); font-size: 1.05rem; padding: .75rem 0; display: block; }
}

/* ─── Hero ─── */
.hero {
  position: relative; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; min-height: 100dvh;
  padding: 7rem 0 5rem;
  color: var(--white); text-align: center;
}
.hero__bg {
  position: absolute; inset: 0; z-index: -1;
  background:
    url('assets/bg.jpg') center top / cover no-repeat,
    linear-gradient(160deg, var(--blue-d) 0%, var(--blue) 40%, var(--blue-l) 100%);
}
.hero__bg::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(13,74,138,.45) 0%, rgba(17,91,171,.7) 100%);
}
.hero__content { position: relative; z-index: 1; }
.hero__mark { margin: 0 auto 1.5rem; width: 120px; opacity: .9; }
.hero__title {
  font-family: var(--serif); font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 600; letter-spacing: -.02em; margin-bottom: .75rem;
}
.hero__sub {
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  max-width: 600px; margin: 0 auto .5rem; opacity: .92;
}
.hero__lead {
  font-size: .95rem; max-width: 520px; margin: 0 auto 2rem; opacity: .72;
}
.hero__actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ─── Buttons ─── */
.btn {
  display: inline-block; text-decoration: none; font-weight: 500; font-size: .95rem;
  padding: .7rem 1.8rem; border-radius: var(--radius); transition: all .2s;
}
.btn--light {
  background: var(--white); color: var(--blue);
}
.btn--light:hover { background: #e8f0fa; }
.btn--outline {
  border: 1.5px solid rgba(255,255,255,.5); color: var(--white);
}
.btn--outline:hover { background: rgba(255,255,255,.12); }
.btn--outline-light {
  border: 1.5px solid rgba(255,255,255,.4); color: var(--white);
}
.btn--outline-light:hover { background: rgba(255,255,255,.1); }

/* ─── Sections ─── */
.section { padding: 5rem 0; }
.section--muted { background: var(--surface); }
.section--dark { background: var(--blue); color: var(--white); }
.section__heading {
  font-family: var(--serif); font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600; letter-spacing: -.01em; margin-bottom: 2rem;
  text-align: center;
}
.section--dark .section__heading { color: var(--white); }

/* ─── Cards ─── */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.5rem;
}
.card {
  background: var(--white); border: 1px solid #e4e7ec; border-radius: var(--radius);
  padding: 2rem 1.75rem;
  transition: box-shadow .25s, transform .25s;
}
.card:hover {
  box-shadow: 0 6px 24px rgba(0,0,0,.06);
  transform: translateY(-2px);
}
.section--muted .card { background: var(--white); }
.card__title {
  font-weight: 600; font-size: 1.05rem; margin-bottom: .5rem; color: var(--blue);
}
.card p { color: var(--ink-75); font-size: .93rem; }

/* ─── Prose ─── */
.prose {
  font-size: 1.05rem; line-height: 1.75; color: var(--ink-75);
  text-align: center; max-width: 620px; margin: 0 auto;
}
.prose + .prose { margin-top: 1rem; }
.section--dark .prose { color: rgba(255,255,255,.8); }

/* ─── Contact ─── */
.contact { text-align: center; }
.contact__email {
  display: inline-block; margin: 1.25rem 0 1.5rem;
  font-size: 1.15rem; font-weight: 500; color: var(--white);
  text-decoration: none; border-bottom: 1.5px solid rgba(255,255,255,.4);
  transition: border-color .2s;
}
.contact__email:hover { border-color: var(--white); }
.contact__links { margin-top: .5rem; }

/* ─── Footer ─── */
.footer {
  background: var(--blue-d); color: rgba(255,255,255,.6);
  padding: 2.5rem 0; font-size: .85rem;
}
.footer__inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }
.footer__logo { height: 28px; width: auto; opacity: .5; }

/* ─── Responsive ─── */
@media (max-width: 640px) {
  .section { padding: 3.5rem 0; }
  .hero { min-height: 90vh; padding: 6rem 0 4rem; }
  .hero__mark { width: 90px; }
  .cards { grid-template-columns: 1fr; }
  .footer__inner { justify-content: center; text-align: center; flex-direction: column; }
}