:root {
  --fg: #1a1a1a;
  --muted: #5b6471;
  --accent: #2b6cb0;
  --accent-soft: #ebf2fa;
  --bg: #ffffff;
  --bg-alt: #f6f8fb;
  --line: #e2e8f0;
  --radius: 14px;
  --maxw: 760px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 22px 80px;
}

/* --- Top bar --- */
.topbar {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px 22px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--fg);
  text-decoration: none;
}
.brand span { color: var(--accent); }
.back-link {
  font-size: .92rem;
  text-decoration: none;
  color: var(--muted);
}
.back-link:hover { color: var(--accent); }

/* --- Language switch --- */
.lang-switch { margin: 22px 0 26px; }
.lang-switch a {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  text-decoration: none;
  margin-right: 8px;
  color: var(--accent);
  font-weight: 600;
  font-size: .92rem;
}
.lang-switch a:hover { background: var(--accent-soft); }

/* --- Document typography --- */
h1 { font-size: 1.7rem; margin: 0 0 8px; letter-spacing: -0.01em; }
h2 {
  font-size: 1.2rem;
  margin: 34px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
}
p, li { font-size: 1rem; }
ul { padding-left: 20px; }
li { margin-bottom: 6px; }
.meta { color: var(--muted); font-size: .92rem; margin: 0 0 6px; }

.divider { height: 1px; background: var(--line); margin: 60px 0; }

section { scroll-margin-top: 20px; }

footer {
  color: var(--muted);
  font-size: .85rem;
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

/* --- Landing page --- */
.hero {
  text-align: center;
  padding: 30px 0 10px;
}
.hero h1 { font-size: 2.1rem; margin-bottom: 10px; }
.hero p { color: var(--muted); font-size: 1.08rem; max-width: 520px; margin: 0 auto; }

.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 36px 0;
}
.card {
  display: block;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  background: var(--bg-alt);
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-1px); }
.card .card-title { font-weight: 700; font-size: 1.05rem; margin-bottom: 4px; }
.card .card-sub { color: var(--muted); font-size: .92rem; }

.contact {
  text-align: center;
  margin-top: 30px;
  color: var(--muted);
  font-size: .95rem;
}

@media (min-width: 620px) {
  .cards { grid-template-columns: 1fr 1fr; }
  .card.full { grid-column: 1 / -1; }
}