:root {
  --bg: #f4fbff;
  --surface: #ffffff;
  --text: #15364d;
  --accent: #0f7fb5;
  --accent-dark: #0b5f87;
  --muted: #5f7d90;
  --ring: rgba(15, 127, 181, 0.25);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  background: var(--bg);
  color: var(--text);
}

.hero {
  color: #fff;
  padding: 1rem 1.25rem 4.5rem;
  background: linear-gradient(135deg, rgba(0, 45, 74, 0.8), rgba(17, 141, 196, 0.75)),
    url("https://images.unsplash.com/photo-1507525428034-b723cf961d3e?auto=format&fit=crop&w=1600&q=80") center/cover;
}

.top-nav {
  max-width: 1000px;
  margin: 0 auto 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0;
}

.cta-link {
  color: #fff;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 999px;
  padding: 0.5rem 0.95rem;
  font-size: 0.95rem;
}

.hero-content {
  max-width: 1000px;
  margin: 0 auto;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 0.75rem;
}

.hero p {
  max-width: 640px;
  margin: 0 0 1.3rem;
}

.button {
  background: #fff;
  color: #084c6b;
  text-decoration: none;
  padding: 0.7rem 1.2rem;
  border-radius: 8px;
  font-weight: 700;
  display: inline-block;
}

.section {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
}

.alt {
  background: #eaf7ff;
  border-top: 1px solid #d5ebf8;
  border-bottom: 1px solid #d5ebf8;
}

.cards {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid #dbe9f2;
  border-radius: 12px;
  padding: 1rem;
  box-shadow: 0 8px 18px rgba(13, 58, 85, 0.06);
}

h2,
h3 {
  margin-top: 0;
}

ul {
  margin: 0;
  padding-left: 1.25rem;
}

.subscribe-form {
  max-width: 520px;
}

.subscribe-form label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.input-row {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

input[type="email"] {
  flex: 1 1 250px;
  border: 1px solid #c6dce9;
  border-radius: 8px;
  padding: 0.72rem 0.75rem;
  font-size: 1rem;
}

input[type="email"]:focus,
button:focus,
.button:focus,
.cta-link:focus {
  outline: 3px solid var(--ring);
  outline-offset: 2px;
}

button {
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  padding: 0.72rem 1rem;
  cursor: pointer;
}

button:hover {
  background: var(--accent-dark);
}

.fine-print {
  color: var(--muted);
  margin-top: 0.5rem;
  font-size: 0.92rem;
}

footer {
  text-align: center;
  color: #4e6a7c;
  padding: 2rem 1rem;
}