/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f4f4f4;
  color: #333;
  line-height: 1.6;
  padding-bottom: 60px;
}

/* Header */
header {
  background: #ffffff;
  padding: 20px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
header img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}
header h1 {
  font-size: 2rem;
  margin-top: 15px;
  color: #2c3e50;
}
header p {
  font-size: 1rem;
  color: #555;
}

/* Navigation */
nav {
  background-color: #2c3e50;
}
nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  padding: 10px 0;
}
nav li {
  margin: 0 15px;
}
nav a {
  color: #fff;
  font-weight: bold;
  text-decoration: none;
  padding: 10px 15px;
}
nav a:hover {
  background: #1a252f;
  border-radius: 6px;
}

/* Main Content */
main {
  max-width: 1100px;
  margin: 30px auto;
  padding: 0 20px;
}
h2 {
  margin: 40px 0 20px;
  color: #1a1a1a;
}
h3 {
  margin: 30px 0 15px;
  color: #333;
}
p {
  margin-bottom: 15px;
}
ul {
  margin-bottom: 20px;
  padding-left: 20px;
}
ul li {
  margin-bottom: 10px;
}

/* Media & Images */
img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  margin: 20px 0;
}
iframe {
  width: 100%;
  height: 315px;
  border: none;
  border-radius: 10px;
  margin: 20px 0;
}

/* Sidebar */
aside.sidebar {
  background: #ffffff;
  max-width: 300px;
  margin: 30px auto;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
aside.sidebar h3 {
  margin-bottom: 15px;
}
aside.sidebar ul {
  padding-left: 20px;
}
aside.sidebar li {
  margin-bottom: 10px;
}

/* Footer */
footer {
  background: #2c3e50;
  color: #fff;
  text-align: center;
  padding: 20px 10px;
  position: relative;
  bottom: 0;
  left: 0;
  width: 100%;
}

/* Responsive */
@media (max-width: 768px) {
  header h1 {
    font-size: 1.6rem;
  }
  nav ul {
    flex-direction: column;
  }
  nav li {
    margin: 10px 0;
  }
  aside.sidebar {
    width: 90%;
  }
}