:root {
  --background-color: #f8fafc;
  --primary-color: #315d7d;
  --secondary-color: #fcd34d;
  --text-color: #1e293b;
  --accent-color: #4ade80;
  --shadow-color: rgba(0, 0, 0, 0.08);
  --hover-color: #3b82f6;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.7;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.25s ease;
}
a:hover {
  color: var(--hover-color);
}

header {
  background-color: var(--primary-color);
  padding: 1.2rem 2rem;
  box-shadow: 0 2px 4px var(--shadow-color);
}

header h1 {
  color: #fff;
  font-size: 1.9rem;
  letter-spacing: 0.5px;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 1.5rem;
}

nav li a {
  color: #f1f5f9;
  font-weight: 500;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
}

nav li a:hover {
  background-color: rgba(255, 255, 255, 0.15);
}

section {
  padding: 4rem 2rem;
  border-bottom: 1px solid #e2e8f0;
}

section h2 {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 1.2rem;
  position: relative;
}

section h2::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background-color: var(--accent-color);
  margin-top: 0.5rem;
  border-radius: 2px;
}

button {
  background-color: var(--secondary-color);
  border: none;
  padding: 0.6rem 1.2rem;
  color: #1e293b;
  font-weight: bold;
  border-radius: 6px;
  cursor: pointer;
  box-shadow: 0 2px 4px var(--shadow-color);
  transition: background-color 0.3s ease;
}
button:hover {
  background-color: #fbbf24;
}

footer {
  background-color: #1e293b;
  color: #f8fafc;
  text-align: center;
  padding: 2rem;
  font-size: 0.95rem;
}

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

img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 2px 8px var(--shadow-color);
}