/* =========================================
   Global Reset & Base Styles
   ========================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f5f5f5;
  color: #333;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* =========================================
   Navigation
   ========================================= */
nav {
  background-color: #1a1a2e;
  padding: 0.75rem 2rem;
}

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

nav ul li a {
  color: #e0e0e0;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}

nav ul li a:hover,
nav ul li a.active {
  color: #00b4d8;
}

/* =========================================
   Header / Hero
   ========================================= */
header {
  background-color: #16213e;
  color: #fff;
  text-align: center;
  padding: 4rem 2rem;
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

header p {
  font-size: 1.1rem;
  color: #a0aec0;
}

/* =========================================
   Main Content
   ========================================= */
main {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

main h2 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
  color: #1a1a2e;
}

main p {
  margin-bottom: 1rem;
}

/* =========================================
   Cards
   ========================================= */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.card {
  background: #fff;
  border-radius: 8px;
  padding: 1.25rem;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

.card h3 {
  margin-bottom: 0.5rem;
  color: #1a1a2e;
}

/* =========================================
   Buttons
   ========================================= */
.btn {
  display: inline-block;
  background-color: #00b4d8;
  color: #fff;
  padding: 0.6rem 1.4rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  transition: background-color 0.2s;
}

.btn:hover {
  background-color: #0096b7;
}

/* =========================================
   Images
   ========================================= */
img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
}

/* =========================================
   Footer
   ========================================= */
footer {
  background-color: #1a1a2e;
  color: #a0aec0;
  text-align: center;
  padding: 1.25rem 2rem;
  font-size: 0.875rem;
}

footer a {
  color: #00b4d8;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}