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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: #1a1a2e;
  line-height: 1.6;
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 5%;
  background: #0f3460;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: #e94560;
  letter-spacing: 0.5px;
}

nav a {
  color: #cbd5e0;
  text-decoration: none;
  margin-left: 2rem;
  font-size: 0.95rem;
  transition: color 0.2s;
}

nav a:hover { color: #fff; }

/* Hero */
.hero {
  background: linear-gradient(135deg, #0f3460 0%, #16213e 100%);
  color: #fff;
  text-align: center;
  padding: 6rem 5% 5rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  margin-bottom: 1.2rem;
  line-height: 1.2;
}

.hero p {
  font-size: 1.1rem;
  color: #a0aec0;
  max-width: 560px;
  margin: 0 auto 2rem;
}

/* Button */
.btn {
  display: inline-block;
  background: #e94560;
  color: #fff;
  text-decoration: none;
  padding: 0.75rem 2rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s;
}

.btn:hover { background: #c73652; }

/* Sections */
.section {
  padding: 5rem 5%;
  text-align: center;
  max-width: 1100px;
  margin: 0 auto;
}

.section.alt {
  max-width: 100%;
  background: #f7f9fc;
  padding: 5rem 5%;
}

.section.alt .section { background: none; padding: 0; }

h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: #0f3460;
}

.section p {
  color: #4a5568;
  max-width: 600px;
  margin: 0 auto 1.5rem;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: #f7f9fc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 2rem 1.5rem;
  text-align: left;
}

.card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: #0f3460;
}

.card p {
  font-size: 0.9rem;
  color: #718096;
  margin: 0;
}

/* Footer */
footer {
  background: #0f3460;
  color: #718096;
  text-align: center;
  padding: 1.5rem;
  font-size: 0.85rem;
}

footer a,
footer a:visited {
  color: #a0aec0 !important;
  text-decoration: none;
}

footer a:hover { color: #fff !important; }

/* ── Mobile ────────────────────────────────────────────── */
@media (max-width: 640px) {
  /* Header stacks logo above nav */
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 5%;
  }

  nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 0;
  }

  nav a {
    margin-left: 0;
    margin-right: 1.2rem;
    font-size: 0.88rem;
  }

  /* Hero tighter padding */
  .hero {
    padding: 4rem 5% 3.5rem;
  }

  /* Sections tighter */
  .section {
    padding: 3.5rem 5%;
  }

  .section.alt {
    padding: 3.5rem 5%;
  }

  h2 { font-size: 1.6rem; }

  /* Cards single column */
  .cards {
    grid-template-columns: 1fr;
  }

  /* Footer links wrap */
  footer {
    padding: 1.5rem 5%;
    line-height: 2;
  }
}