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

body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  color: #222;
  min-height: 100vh;
}

.page-container {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 20px 60px;
}

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

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.hero p {
  font-size: 1rem;
  color: #666;
}

.tab-container {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 35px;
  flex-wrap: wrap;
}

.tab-button {
  padding: 12px 24px;
  border: 2px solid #222;
  background-color: white;
  color: #222;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.tab-button:hover {
  background-color: #222;
  color: white;
  transform: translateY(-2px);
}

.tab-button.active {
  background-color: #222;
  color: white;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.tab-content h2 {
  text-align: center;
  margin-bottom: 15px;
}

.section-intro {
  text-align: center;
  color: #555;
  margin-bottom: 30px;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.video-card,
.about-card {
  background-color: white;
  padding: 18px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.video-card:hover,
.about-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.12);
}

.video-card iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
  border-radius: 8px;
  display: block;
}

.video-card p,
.about-card p {
  color: #555;
  line-height: 1.6;
  margin-bottom: 12px;
}

.about-card p:last-child {
  margin-bottom: 0;
}