/* css/styles.css - Method 2: Intersection Observer */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: #333;
}

header {
  text-align: center;
  padding: 2rem;
  background: #f8f9fa;
}

header h1 {
  color: #333;
  margin-bottom: 0.5rem;
}

/* Hero section - loads immediately */
.hero {
  height: 80vh;
  position: relative;
  overflow: hidden;
  background: #000;
}

.hero-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: white;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
}

.hero-content h2 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero-content p {
  font-size: 1.5rem;
}

/* Spacer to demonstrate lazy loading */
.spacer {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(45deg, #667eea 0%, #764ba2 100%);
  color: white;
  text-align: center;
  font-size: 1.5rem;
}

/* Demo section */
.demo-section {
  padding: 4rem 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.demo-section h2 {
  margin-bottom: 2rem;
  color: #333;
  text-align: center;
}

/* Status display - unique to Method 2 */
.status-display {
  background: #1f2937;
  color: white;
  padding: 1.5rem;
  border-radius: 8px;
  margin-bottom: 2rem;
  font-family: "Courier New", monospace;
}

.status-item {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  align-items: center;
}

.status-item:last-child {
  margin-bottom: 0;
}

.status-item .label {
  color: #9ca3af;
  font-weight: 600;
}

.status-item .value {
  color: #10b981;
  font-weight: bold;
  min-width: 120px;
  text-align: right;
}

/* Dynamic status colors */
.status-item .value.not-loaded {
  color: #6b7280;
}

.status-item .value.loading {
  color: #f59e0b;
}

.status-item .value.playing {
  color: #10b981;
}

.status-item .value.error {
  color: #ef4444;
}

/* Video container with aspect ratio */
.video-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  background-color: #000;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 2rem;
}

.lazy-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Code example */
.code-example {
  background: #1e1e1e;
  color: #f8f8f2;
  padding: 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 2rem;
}

.code-example pre {
  margin: 0;
  font-family: "Courier New", monospace;
  line-height: 1.4;
}

/* Method info box */
.method-info {
  background: #f8f9fa;
  padding: 2rem;
  border-radius: 8px;
  border-left: 4px solid #8b5cf6;
}

.method-info h3 {
  margin-bottom: 1rem;
  color: #333;
}

.method-info code {
  background: #e9ecef;
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-family: "Courier New", monospace;
}

.pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1rem;
}

.pros h3 {
  color: #10b981;
  margin-bottom: 1rem;
}

.cons h3 {
  color: #ef4444;
  margin-bottom: 1rem;
}

.pros ul,
.cons ul {
  list-style: none;
  padding-left: 0;
}

.pros li,
.cons li {
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
}

.pros li:before {
  content: "✅";
  position: absolute;
  left: 0;
}

.cons li:before {
  content: "❌";
  position: absolute;
  left: 0;
}

/* Testing instructions */
.testing-box {
  background: #e0f2fe;
  border: 1px solid #0284c7;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 2rem 0;
}

.testing-box h3 {
  color: #0369a1;
  margin-bottom: 1rem;
}

.testing-box ol {
  margin-left: 1.5rem;
}

.testing-box li {
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.testing-box code {
  background: #1e293b;
  color: #10b981;
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-family: "Courier New", monospace;
  font-size: 0.9rem;
}

.testing-box ul {
  margin-left: 1.5rem;
}

.testing-box ul li {
  margin-bottom: 0.25rem;
}

.testing-box p {
  margin-top: 1rem;
  font-weight: bold;
  color: #0369a1;
}

/* Mobile responsive */
@media (max-width: 768px) {
  .hero-content h2 {
    font-size: 2rem;
  }

  .hero-content p {
    font-size: 1.2rem;
  }

  .pros-cons {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .demo-section {
    padding: 2rem 1rem;
  }

  .spacer {
    font-size: 1.2rem;
    padding: 1rem;
  }

  .status-display {
    font-size: 0.9rem;
  }

  .status-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .status-item .value {
    text-align: left;
    min-width: auto;
  }
}