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

body {
  font-family: "Segoe UI", Arial, sans-serif;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: #eee;
  padding: 40px 20px;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
}

h1 {
  text-align: center;
  margin-bottom: 10px;
}

.subtitle {
  text-align: center;
  color: #aaa;
  margin-bottom: 40px;
}

.section {
  background-color: #0f3460;
  border-radius: 16px;
  padding: 25px;
  margin-bottom: 30px;
}

.section-title {
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 15px;
  color: #4a90e2;
  border-left: 4px solid #4a90e2;
  padding-left: 15px;
}

.section-description {
  color: #aaa;
  margin-bottom: 25px;
  font-size: 14px;
  padding-left: 19px;
}

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

.note {
  background-color: #1a1a2e;
  border-left: 4px solid #f39c12;
  padding: 15px;
  border-radius: 8px;
  margin: 15px 0;
}

/* ===================================
           DEMO 1: BASIC CARD GRID
           =================================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  margin: 20px 0;
}

.card {
  background-color: #1a1a2e;
  border-radius: 16px;
  overflow: hidden;
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

/* ===================================
           IMAGE CONTAINER WITH ASPECT RATIO
           =================================== */
.card-img {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: #2a3a5a;
}

.card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.card:hover .card-img img {
  transform: scale(1.05);
}

/* Placeholder images using gradients */
.img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
}

.card-content {
  padding: 20px;
}

.card-title {
  font-size: 18px;
  font-weight: bold;
  margin-bottom: 8px;
  color: #4a90e2;
}

.card-description {
  font-size: 14px;
  color: #aaa;
  line-height: 1.5;
}

/* ===================================
           DEMO 2: DIFFERENT ASPECT RATIOS
           =================================== */
.aspect-1-1 .card-img {
  aspect-ratio: 1 / 1;
}

.aspect-4-3 .card-img {
  aspect-ratio: 4 / 3;
}

.aspect-21-9 .card-img {
  aspect-ratio: 21 / 9;
}

/* ===================================
           DEMO 3: PRODUCT CARD GALLERY
           =================================== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 25px;
  margin: 20px 0;
}

.product-card {
  background-color: #1a1a2e;
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.product-img {
  aspect-ratio: 1 / 1;
  background: linear-gradient(135deg, #667eea, #764ba2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
}

.product-info {
  padding: 15px;
}

.product-title {
  font-weight: bold;
  margin-bottom: 5px;
}

.product-price {
  color: #4a90e2;
  font-weight: bold;
  margin: 10px 0;
}

.btn-add {
  width: 100%;
  padding: 10px;
  background-color: #4a90e2;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.btn-add:hover {
  background-color: #357abd;
}

/* ===================================
           DEMO 4: PORTFOLIO GALLERY
           =================================== */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
  margin: 20px 0;
}

.portfolio-item {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  cursor: pointer;
}

.portfolio-img {
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, #f093fb, #f5576c);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  transition: transform 0.4s ease;
}

.portfolio-item:hover .portfolio-img {
  transform: scale(1.1);
}

.portfolio-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
  padding: 60px 20px 20px;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.portfolio-item:hover .portfolio-overlay {
  transform: translateY(0);
}

.portfolio-title {
  font-weight: bold;
  font-size: 18px;
}

.portfolio-category {
  font-size: 12px;
  color: #aaa;
}

footer {
  text-align: center;
  padding: 40px;
  color: #666;
}