* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: #f5f5f5;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  background: #fff;
  padding: 20px 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

header h1 {
  color: #1976d2;
  font-size: 24px;
}

nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #666;
}

nav a:hover {
  color: #1976d2;
}

/* Main */
main {
  padding: 40px 0;
  min-height: calc(100vh - 200px);
}

.hero {
  text-align: center;
  padding: 60px 0;
}

.hero h2 {
  font-size: 36px;
  color: #1976d2;
  margin-bottom: 20px;
}

.hero p {
  font-size: 18px;
  color: #666;
  margin-bottom: 30px;
}

.btn {
  display: inline-block;
  background: #1976d2;
  color: #fff;
  padding: 12px 30px;
  text-decoration: none;
  border-radius: 4px;
  transition: background 0.3s;
}

.btn:hover {
  background: #1565c0;
}

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 60px;
}

.feature {
  background: #fff;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.feature h3 {
  color: #1976d2;
  margin-bottom: 10px;
}

.feature p {
  color: #666;
}

/* Files */
h2 {
  font-size: 32px;
  margin-bottom: 10px;
  color: #333;
}

.subtitle {
  color: #666;
  margin-bottom: 30px;
}

.files {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 30px;
}

.file-card {
  background: #fff;
  padding: 25px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.file-card h3 {
  color: #333;
  margin-bottom: 10px;
}

.file-card p {
  color: #666;
  margin-bottom: 10px;
}

.file-info {
  color: #999;
  font-size: 14px;
  margin-bottom: 15px;
}

/* Footer */
footer {
  background: #fff;
  padding: 30px 0;
  margin-top: 60px;
  text-align: center;
  border-top: 1px solid #e0e0e0;
}

footer p {
  color: #666;
  margin-bottom: 10px;
}

footer a {
  color: #999;
  text-decoration: none;
}

footer a:hover {
  color: #1976d2;
}

/* Responsive */
@media (max-width: 768px) {
  header .container {
    flex-direction: column;
    gap: 20px;
  }

  .hero h2 {
    font-size: 28px;
  }

  .features,
  .files {
    grid-template-columns: 1fr;
  }
}