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

:root {
  --primary-orange: #ff6b35;
  --secondary-blue: #4a90e2;
  --text-dark: #333333;
  --text-light: #666666;
  --bg-light: #f8f9fa;
  --white: #ffffff;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--white);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  background-color: var(--white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-orange);
  text-decoration: none;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
}

nav a {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

nav a:hover {
  color: var(--primary-orange);
}

.hero {
  padding: 4rem 0;
  text-align: center;
  background-color: var(--bg-light);
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-light);
}

.welcome-section {
  padding: 4rem 0;
  background-color: var(--bg-light);
}

.welcome-content {
  background-color: var(--white);
  border-radius: 12px;
  padding: 3rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.welcome-intro {
  font-size: 1.2rem;
  color: var(--text-dark);
  line-height: 1.8;
  margin-bottom: 3rem;
  text-align: center;
  font-weight: 500;
}

.welcome-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.welcome-card {
  background-color: var(--bg-light);
  padding: 2rem;
  border-radius: 8px;
  border-left: 4px solid var(--primary-orange);
}

.welcome-card h2 {
  color: var(--primary-orange);
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.welcome-card p {
  color: var(--text-dark);
  line-height: 1.7;
  font-size: 1.05rem;
}

.welcome-outro {
  font-size: 1.1rem;
  color: var(--text-dark);
  text-align: center;
  font-style: italic;
  margin-top: 2rem;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
  padding: 3rem 0;
}

.video-card {
  background-color: var(--white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.video-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.video-thumbnail {
  position: relative;
  padding-bottom: 56.25%;
  background-color: var(--bg-light);
  overflow: hidden;
}

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

.video-thumbnail::before {
  content: '▶';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 3rem;
  color: var(--white);
  background-color: rgba(0, 0, 0, 0.7);
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.video-card:hover .video-thumbnail::before {
  opacity: 1;
}

.video-info {
  padding: 1.5rem;
}

.video-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text-dark);
}

.video-description {
  color: var(--text-light);
  line-height: 1.5;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--primary-orange);
  color: var(--white);
  text-decoration: none;
  border-radius: 4px;
  font-weight: 500;
  transition: background-color 0.3s ease;
  margin-top: 1rem;
}

.btn:hover {
  background-color: #e55a2b;
}

.video-page {
  padding: 3rem 0;
}

.video-container {
  max-width: 900px;
  margin: 0 auto;
}

.video-player {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  background-color: #000;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.video-player video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.video-details {
  margin-top: 2rem;
}

.video-details h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.video-meta {
  display: flex;
  gap: 2rem;
  margin-bottom: 2rem;
  color: var(--text-light);
}

.back-link {
  display: inline-flex;
  align-items: center;
  color: var(--primary-orange);
  text-decoration: none;
  font-weight: 500;
  margin-bottom: 2rem;
}

.back-link:hover {
  text-decoration: underline;
}

footer {
  background-color: var(--bg-light);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-light);
  margin-top: 4rem;
}

.footer-links {
  margin-top: 1rem;
}

.footer-links a {
  color: var(--text-light);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--primary-orange);
  text-decoration: underline;
}

.footer-links .separator {
  margin: 0 1rem;
  color: var(--text-light);
}

@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  nav ul {
    gap: 1rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .video-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .welcome-content {
    padding: 2rem 1.5rem;
  }
  
  .welcome-intro {
    font-size: 1.1rem;
    margin-bottom: 2rem;
  }
  
  .welcome-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .welcome-card {
    padding: 1.5rem;
  }
  
  .welcome-card h2 {
    font-size: 1.3rem;
  }
}