body {
  font-family: "Segoe UI", Arial, sans-serif;
  background-color: #1a1a2e;
  color: #eee;
  margin: 0;
  padding: 20px;
  line-height: 1.6;
}

h1 {
  text-align: center;
  color: #4a90e2;
}

.main-title {
  text-align: center;
  margin-bottom: 40px;
}

/* Each demo section is a card */
.demo-section {
  background-color: #16213e;
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 30px;
  border-left: 4px solid #4a90e2;
}

.demo-title {
  font-size: 20px;
  font-weight: bold;
  margin-bottom: 15px;
  color: #4a90e2;
}

.demo-description {
  font-size: 14px;
  color: #aaa;
  margin-bottom: 20px;
}

/* The container where centering happens */
.center-container {
  background-color: #0f3460;
  border-radius: 12px;
  margin: 20px 0;
  position: relative;
}

/* The box being centered */
.center-box {
  background-color: #4a90e2;
  color: white;
  padding: 15px;
  border-radius: 8px;
  width: 150px;
  text-align: center;
  font-weight: bold;
}

.code {
  background-color: #0a0a1a;
  padding: 12px;
  border-radius: 8px;
  font-family: "Courier New", monospace;
  font-size: 13px;
  color: #82b1ff;
  margin-top: 15px;
  overflow-x: auto;
}

hr {
  border-color: #2a3a5a;
  margin: 30px 0;
}

/* ===================================
           METHOD 1: TEXT-ALIGN CENTER
           =================================== */
.text-align-container {
  text-align: center;
  padding: 40px;
}

.inline-box {
  display: inline-block;
  background-color: #e94560;
  padding: 15px 25px;
  border-radius: 8px;
  color: white;
}

/* ===================================
           METHOD 2: MARGIN AUTO
           =================================== */
.margin-auto-container {
  padding: 40px;
}

.margin-auto-box {
  width: 200px;
  margin-left: auto;
  margin-right: auto;
  background-color: #e94560;
  padding: 15px;
  border-radius: 8px;
  text-align: center;
}

/* ===================================
           METHOD 3: FLEXBOX CENTERING
           =================================== */
.flex-center-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
}

/* ===================================
           METHOD 4: FLEXBOX HORIZONTAL ONLY
           =================================== */
.flex-horizontal {
  display: flex;
  justify-content: center;
  padding: 40px;
}

/* ===================================
           METHOD 5: GRID CENTERING
           =================================== */
.grid-center-container {
  display: grid;
  place-items: center;
  height: 200px;
}

/* ===================================
           BONUS: MULTIPLE ITEMS IN FLEX
           =================================== */
.flex-multiple {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 30px;
}

.small-box {
  background-color: #e94560;
  padding: 10px 20px;
  border-radius: 8px;
}

/* ===================================
           BONUS: ABSOLUTE POSITION CENTERING
           =================================== */
.absolute-container {
  position: relative;
  height: 200px;
}

.absolute-box {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

footer {
  text-align: center;
  padding: 30px;
  color: #666;
}