:root {
  --main-blue: #1e3a8a;
  --accent-blue: #1e88e5;
  --light-bg: #f4f6fa;
  --light-blue-bg: #eef1f7;
  --text-dark: #222;
  --shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

body {
  margin: 0;
  font-family: "Segoe UI", sans-serif;
  background-color: var(--light-bg);
  color: var(--text-dark);
  scroll-behavior: smooth;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: auto;
}

header {
  background-color: #ffffff;
  color: var(--main-blue);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  transition: all 0.3s ease;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}

.logo img {
  height: 60px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 20px;
}

.nav-links li a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  transition: color 0.3s;
}

.nav-links li a:hover {
  color: var(--main-blue);
}

.intro-section {
  padding: 130px 20px 60px;
  background-color: var(--light-blue-bg);
}

.intro-section h1,
.intro-section h2,
.intro-section h3 {
  color: var(--main-blue);
  margin-bottom: 20px;
}

.intro-section p {
  margin-bottom: 15px;
  line-height: 1.7;
}

.intro-section ul {
  padding-left: 20px;
  margin-bottom: 30px;
}

.intro-section li {
  margin-bottom: 10px;
}

.image-box {
  text-align: center;
  margin: 30px 0;
}

.image-box img {
  max-width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.image-box.row-images {
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
}

.section-title {
  font-size: 24px;
  font-weight: bold;
  margin-top: 40px;
  color: var(--accent-blue);
}

footer {
  text-align: center;
  padding: 20px;
  background-color: var(--main-blue);
  color: white;
}