/* Shared visual style planned for the final aquatic life website. */
:root {
  --navy: #073b4c;
  --ocean: #087f8c;
  --aqua: #b8edf0;
  --foam: #f4fbfb;
  --sand: #f5e6c8;
  --ink: #17363d;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background-color: var(--foam);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

header {
  padding: 5rem 1.5rem 4rem;
  color: var(--white);
  text-align: center;
  background: linear-gradient(135deg, var(--navy), var(--ocean));
}

.eyebrow {
  margin: 0;
  color: var(--aqua);
  font-size: 0.85rem;
  font-weight: bold;
  letter-spacing: 0.18rem;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.2;
}

h1 {
  margin: 0.4rem 0;
  font-size: clamp(2.6rem, 7vw, 5rem);
}

.tagline {
  max-width: 650px;
  margin: 0 auto;
  font-size: 1.15rem;
}

nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  padding: 0.9rem 1rem;
  background-color: var(--white);
  border-bottom: 1px solid #b9d7d9;
  box-shadow: 0 3px 12px rgb(7 59 76 / 10%);
}

nav a {
  color: var(--navy);
  font-weight: bold;
  text-decoration: none;
}

nav a:hover,
nav a:focus {
  color: var(--ocean);
  text-decoration: underline;
}

main {
  width: min(1100px, 92%);
  margin: 0 auto;
}

section {
  padding: 3rem 0;
  border-bottom: 1px solid #cbe2e3;