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

body {
  font-family: Georgia, serif;
  background-color: #f0f8fc;
  color: #1a2e3a;
  line-height: 1.7;
}

/* ── Top utility bar ── */
.top-bar {
  background-color: #0d3d52;
  color: #ffffff;
  font-size: 0.8rem;
  display: flex;
  justify-content: flex-end;
  gap: 1.5rem;
  padding: 0.4rem 2rem;
}

.top-bar a {
  color: #ffffff;
  text-decoration: none;
  opacity: 0.9;
}

.top-bar a:hover {
  opacity: 1;
  text-decoration: underline;
}

/* ── Header ── */
header {
  background-color: #ffffff;
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #e0e0e0;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
}

.header-brand h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #1a5f7a;
  letter-spacing: -0.01em;
}

.header-brand p {
  font-size: 0.82rem;
  color: #666;
  margin-top: 0.1rem;
}

.header-cta {
  display: inline-block;
  background-color: #1a5f7a;
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.65rem 1.4rem;
  border-radius: 30px;
  text-decoration: none;
  transition: background-color 0.2s;
  white-space: nowrap;
}

.header-cta:hover {
  background-color: #0d3d52;
}

/* ── Nav ── */
nav {
  background-color: #ffffff;
  display: flex;
  gap: 0;
  border-bottom: 2px solid #1a5f7a;
  padding: 0 1.5rem;
}

nav a {
  color: #333;
  text-decoration: none;
  padding: 0.85rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: color 0.2s, border-bottom 0.2s;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
}

nav a:hover,
nav a.active {
  color: #1a5f7a;
  border-bottom: 3px solid #1a5f7a;
}

/* ── Hero banner ── */
.hero {
  background: linear-gradient(135deg, #1a5f7a 0%, #48b0d0 100%);
  color: #ffffff;
  padding: 3.5rem 2rem;
  text-align: center;
}

.hero h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: #ffffff;
  border: none;
  padding: 0;
}

.hero p {
  font-size: 1.05rem;
  opacity: 0.92;
  max-width: 640px;
  margin: 0 auto 1.75rem;
}

.hero-btn {
  display: inline-block;
  background-color: #ffffff;
  color: #1a5f7a;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.75rem 1.75rem;
  border-radius: 30px;
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s;
}

.hero-btn:hover {
  background-color: #d6eef7;
}

/* ── Main content ── */
main {
  max-width: 960px;
  margin: 2.5rem auto;
  padding: 0 1.5rem;
}

h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a5f7a;
  margin: 2rem 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid #a8d8ea;
}

h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #1a2e3a;
  margin: 1.5rem 0 0.35rem;
}

p {
  color: #444;
  margin-bottom: 1rem;
}

/* ── Intro callout ── */
.intro {
  font-size: 1rem;
  background-color: #d6eef7;
  border-left: 4px solid #1a5f7a;
  padding: 1rem 1.25rem;
  margin-bottom: 2rem;
  border-radius: 0 6px 6px 0;
  color: #1a2e3a;
}

/* ── Card grid ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 1.75rem;
}

.card {
  background: #ffffff;
  border: 1px solid #e0e0e0;
  border-top: 4px solid #1a5f7a;
  border-radius: 6px;
  padding: 1.25rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07);
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
}

.card h3 {
  margin-top: 0.5rem;
  font-size: 1.05rem;
  color: #1a2e3a;
}

.card p {
  font-size: 0.9rem;
  color: #555;
  margin-bottom: 0;
}

.card .tag {
  display: inline-block;
  background-color: #d6eef7;
  color: #1a5f7a;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.6rem;
  border-radius: 30px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ── Footer ── */
footer {
  background-color: #1a1a1a;
  color: #cccccc;
  text-align: center;
  padding: 2rem;
  font-size: 0.85rem;
  margin-top: 4rem;
}

footer a {
  color: #2a6a82;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}