/* =========================================
   1. EXISTING HTML TAGS (Listed First)
   ========================================= */
body {
  max-width: 1000px;
  margin: auto;
  font-family: Arial, Helvetica, sans-serif;
  background-color: #f4f4f4;
}
header {
  text-align: center;
  background-color: #e0e0e0;
  padding: 20px;
  margin-bottom: 20px;
}
nav {
  text-align: center;
  border-bottom: 2px solid #AAA;
  padding-bottom: 10px;
  margin-bottom: 20px;
}
nav ul {
  list-style-type: none;
  padding: 0;
}
nav li {
  display: inline;
  padding: 0 14px;
}
nav a {
  text-decoration: none;
  color: blue;
  font-weight: bold;
}
nav a:hover {
  color: magenta;
  background-color: yellow;
}
main img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 20px auto;
}
blockquote {
  text-align: justify;
  margin: 20px 40px;
}
blockquote:first-letter {
  font-size: 1.8em;
  font-weight: bold;
  color: #003366;
}
table {
  border: 4px solid #003399;
  border-collapse: collapse;
  margin: 20px auto; 
  width: 600px;
  background-color: #ffffff;
}
th {
  background-color: #e0e0e0;
  padding: 10px;
  font-size: 1.2em;
}
td {
  padding: 10px;
  border: 1px solid #cccccc;
}

/* =========================================
   2. IDs (Listed Second)
   ========================================= */
#wrapper {
  background-color: #ffffff;
  padding: 20px;
}

/* =========================================
   3. CLASSES (Listed Last)
   ========================================= */
.selected {
  background-color: #C0C0C0;
  padding: 4px 8px;
  border-radius: 4px;
}
.box {
  border: 2px blue solid;
  padding: 15px;
  margin-top: 15px;
}
.infobar {
  background-color: #003366;
  color: white;
  padding: 10px;
  text-align: center;
  margin: 20px 0;
  font-weight: bold;
}
.row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.column {
  flex: 1;
  min-width: 300px;
  box-sizing: border-box;
}
@media screen and (max-width: 768px) {
  .column {
    flex: 100%;
  }
}
.css3-shadow {
  box-shadow: 5px 5px 15px rgba(0,0,0,0.3);
}
.css3-transform {
  transition: transform 0.3s ease;
}
.css3-transform:hover {
  transform: translateY(-5px);
}
.required {
  color: red;
  font-weight: bold;
}