body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin: 20px;
  background-color: #f4f4f4;
}

section {
  background-color: white;
  margin-bottom: 30px;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

h2 {
  color: #2c3e50;
  border-bottom: 2px solid #3498db;
  padding-bottom: 10px;
}

/* ===================================
           CONTENT DEMO (no padding, border, margin)
           =================================== */
.content-box {
  background-color: #fff9c4;
  width: 300px;
}

/* ===================================
           PADDING DEMO (space inside border)
           =================================== */
.padding-none {
  background-color: #ffccbc;
  width: 300px;
}

.padding-small {
  background-color: #ffccbc;
  width: 300px;
  padding: 10px;
}

.padding-medium {
  background-color: #ffccbc;
  width: 300px;
  padding: 20px;
}

.padding-large {
  background-color: #ffccbc;
  width: 300px;
  padding: 40px;
}

/* Different padding on each side */
.padding-individual {
  background-color: #ffccbc;
  width: 300px;
  padding-top: 10px;
  padding-right: 30px;
  padding-bottom: 20px;
  padding-left: 5px;
}

/* Padding shorthand */
.padding-shorthand {
  background-color: #ffccbc;
  width: 300px;
  padding: 20px 40px; /* top/bottom = 20px, left/right = 40px */
}

/* ===================================
           BORDER DEMO (edge around padding)
           =================================== */
.border-none {
  background-color: #c8e6c9;
  padding: 20px;
  width: 300px;
  border: none;
}

.border-solid {
  background-color: #c8e6c9;
  padding: 20px;
  width: 300px;
  border: 2px solid #4caf50;
}

.border-dashed {
  background-color: #c8e6c9;
  padding: 20px;
  width: 300px;
  border: 2px dashed #ff9800;
}

.border-dotted {
  background-color: #c8e6c9;
  padding: 20px;
  width: 300px;
  border: 2px dotted #2196f3;
}

.border-thick {
  background-color: #c8e6c9;
  padding: 20px;
  width: 300px;
  border: 8px solid #e91e63;
}

.border-rounded {
  background-color: #c8e6c9;
  padding: 20px;
  width: 300px;
  border: 2px solid #9c27b0;
  border-radius: 15px;
}

/* ===================================
           MARGIN DEMO (space outside border)
           =================================== */
.margin-demo-container {
  background-color: #e1bee7;
  padding: 10px;
  margin-bottom: 10px;
}

.margin-none {
  background-color: #90caf9;
  padding: 20px;
  margin: 0;
}

.margin-small {
  background-color: #90caf9;
  padding: 20px;
  margin: 10px;
}

.margin-medium {
  background-color: #90caf9;
  padding: 20px;
  margin: 30px;
}

.margin-large {
  background-color: #90caf9;
  padding: 20px;
  margin: 60px;
}

/* Different margin on each side */
.margin-individual {
  background-color: #90caf9;
  padding: 20px;
  margin-top: 20px;
  margin-right: 10px;
  margin-bottom: 30px;
  margin-left: 50px;
}

/* ===================================
           COMPLETE BOX MODEL DEMO
           =================================== */
.box-model-demo {
  background-color: #fff3e0;
  width: 300px;
  padding: 30px;
  border: 5px solid #ff9800;
  margin: 40px;
  box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.2);
}

/* ===================================
           BOX-SIZING DEMO
           =================================== */
.no-box-sizing {
  width: 300px;
  padding: 20px;
  border: 5px solid red;
  background-color: #ffcdd2;
  margin-bottom: 20px;
}

.with-box-sizing {
  width: 300px;
  padding: 20px;
  border: 5px solid green;
  background-color: #c8e6c9;
  box-sizing: border-box;
  margin-bottom: 20px;
}

/* ===================================
           VISUAL COMPARISON BOXES
           =================================== */
.comparison-box {
  display: inline-block;
  width: 200px;
  vertical-align: top;
  margin: 10px;
}

.no-padding-box {
  background-color: #ffab91;
  border: 2px solid #bf360c;
}

.with-padding-box {
  background-color: #ffab91;
  border: 2px solid #bf360c;
  padding: 20px;
}

.with-margin-box {
  background-color: #ffab91;
  border: 2px solid #bf360c;
  margin: 20px;
}

/* Box model visual representation */
.box-model-visual {
  background-color: #e8eaf6;
  padding: 40px;
  border: 4px solid #3f51b5;
  margin: 30px;
  position: relative;
}

.box-model-visual::before {
  content: "MARGIN (transparent space outside)";
  position: absolute;
  top: -25px;
  left: 10px;
  font-size: 12px;
  color: #666;
}

.border-label {
  position: absolute;
  top: 40%;
  left: 10px;
  font-size: 12px;
  color: #3f51b5;
}

.code-example {
  background-color: #263238;
  color: #82b1ff;
  padding: 15px;
  border-radius: 8px;
  font-family: "Courier New", monospace;
  font-size: 14px;
  overflow-x: auto;
}