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




body {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #111827;
  background-color: #f3f4f6;
  padding-bottom: 3rem;
}




header {
  background-color: #2563eb;
  color: white;
  padding: 1.5rem 1rem;
  text-align: center;
  border-bottom: 4px solid #1e40af;
}

header h1 {
  font-size: 2rem;
  font-weight: bold;
}




nav {
  background-color: #1e40af; 
  padding: 1rem 0;
}

#main-nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 2rem;
  align-items: center;
  flex-wrap: wrap;
}

nav a {
  color: #ffffff;
  text-decoration: none;
  padding: 0.5rem 1rem;
  display: inline-block;
  border-radius: 6px;
  font-weight: 600;
  transition: background-color 150ms ease, color 150ms ease;
}


nav a:link {
  color: #ffffff;
}

nav a:visited {
  color: #e5e7eb;
}

nav a:hover {
  background-color: rgba(255, 255, 255, 0.14);
}

nav a:active {
  background-color: rgba(255, 255, 255, 0.22);
  color: #0f172a;
}



main {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
  display: block;
}

section {
  background-color: white;
  padding: 1.5rem;
  border-radius: 10px;
  margin-bottom: 2rem;
  border: 1px solid #d1d5db;
}

section h2 {
  margin-bottom: 1rem;
  font-size: 1.6rem;
  color: #1e3a8a;
}




ul, ol {
  margin-left: 1.8rem;
  margin-bottom: 1rem;
  color: #111827;
}




table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

th, td {
  padding: 0.7rem;
  border: 1px solid #9ca3af;
}

th {
  background-color: #1e3a8a;
  color: white;
}

caption {
  margin-bottom: 0.5rem;
  font-weight: bold;
}


form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 500px;
}

input, textarea {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid #9ca3af;
  border-radius: 6px;
}

label {
  font-weight: 600;
}

button, input[type="submit"] {
  background-color: #2563eb;
  color: white;
  border: none;
  padding: 0.8rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: bold;
}

button:hover,
input[type="submit"]:hover {
  background-color: #1d4ed8;
}

a {
  color: #2563eb;
}

a:hover {
  text-decoration: underline;
}



.highlight {
  background-color: #fff3cd;
  padding: 0.4rem;
  border-radius: 4px;
}

.card {
  border: 1px solid #d1d5db;
  padding: 1rem;
  border-radius: 8px;
  background-color: white;
}

#special-box {
  background-color: #e0f2fe;
  padding: 1rem;
  border-left: 4px solid #0ea5e9;
}



img, video {
  max-width: 100%;
  border-radius: 8px;
}



footer {
  background-color: #111827;
  color: #d1d5db;
  text-align: center;
  padding: 1.5rem;
  margin-top: 3rem;
}



.html-section {
    text-align: center;
    margin: 2rem 0;
}

.html-section img,
.html-section p {
    display: inline-block;
    vertical-align: middle;
    margin: 0 15px;
}

.side-img {
    width: 350px;
    max-width: 130%;
}

.center-text {
    width: 350px;
    text-align: justify;
}



@media (max-width: 700px) {
  nav ul {
    flex-direction: column;
    gap: 1rem;
  }

  header h1 {
    font-size: 1.5rem;
  }

  section {
    padding: 1.2rem;
  }

  
  .html-section img,
  .html-section p {
      display: block;
      margin: 1rem auto;
  }

  .center-text {
      width: 100%;
  }
}