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

body {
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell',
    'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: #0f172a;
  color: #e2e8f0;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  padding: 2rem;
  text-align: center;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  border-bottom: 1px solid #334155;
}

.app-header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  color: #ef4444;
}

.app-header p {
  font-size: 1.1rem;
  color: #94a3b8;
}

.app-main {
  flex: 1;
  padding: 2rem;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.video-section {
  margin-bottom: 3rem;
}

.player-wrapper {
  max-width: 1200px;
  margin: 0 auto 2rem;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.no-video {
  aspect-ratio: 16 / 9;
  background-color: #1e293b;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #64748b;
  font-size: 1.2rem;
}

.controls-section {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.url-input {
  display: flex;
  gap: 1rem;
}

.url-input input {
  flex: 1;
  padding: 0.75rem 1rem;
  background-color: #1e293b;
  border: 2px solid #334155;
  border-radius: 8px;
  color: #e2e8f0;
  font-size: 1rem;
  transition: all 0.2s;
}

.url-input input:focus {
  outline: none;
  border-color: #ef4444;
  background-color: #0f172a;
}

.url-input input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.url-input button {
  padding: 0.75rem 2rem;
  background-color: #334155;
  border: 2px solid #475569;
  border-radius: 8px;
  color: #e2e8f0;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.url-input button:hover {
  background-color: #475569;
  border-color: #64748b;
}

.url-input button.active {
  background-color: #ef4444;
  border-color: #ef4444;
  color: white;
}

.toggle-row {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: #cbd5e1;
  font-size: 0.95rem;
}

.toggle-row input[type='checkbox'] {
  width: 16px;
  height: 16px;
  accent-color: #ef4444;
}

.media-test-section {
  max-width: 1200px;
  margin: 2rem auto 0;
}

.media-test-section h2 {
  font-size: 1.8rem;
  color: #ef4444;
  margin-bottom: 0.35rem;
}

.media-test-subtitle {
  color: #94a3b8;
  margin-bottom: 1.3rem;
}

.media-test-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
}

.media-test-card {
  background-color: #1e293b;
  border: 1px solid #334155;
  border-radius: 12px;
  padding: 1rem;
}

.media-test-card h3 {
  color: #f1f5f9;
  margin-bottom: 0.45rem;
}

.media-test-card p {
  color: #cbd5e1;
  font-size: 0.95rem;
  margin-bottom: 0.85rem;
}

.media-test-player {
  border-radius: 10px;
  overflow: hidden;
}

.media-test-player-gif {
  max-width: 320px;
}

.features-section {
  margin-top: 4rem;
}

.features-section h2 {
  font-size: 2rem;
  margin-bottom: 2rem;
  text-align: center;
  color: #ef4444;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.feature {
  background-color: #1e293b;
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid #334155;
}

.feature h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: #f1f5f9;
}

.feature ul {
  list-style: none;
}

.feature li {
  padding: 0.5rem 0;
  color: #cbd5e1;
  font-size: 0.95rem;
}

kbd {
  display: inline-block;
  padding: 2px 6px;
  background-color: #334155;
  border: 1px solid #475569;
  border-radius: 4px;
  font-size: 0.85rem;
  font-family: monospace;
  color: #f1f5f9;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.app-footer {
  padding: 2rem;
  text-align: center;
  background-color: #0f172a;
  border-top: 1px solid #334155;
  color: #64748b;
}

.app-footer p {
  margin: 0.25rem 0;
}

@media (max-width: 768px) {
  .app-header h1 {
    font-size: 2rem;
  }

  .app-main {
    padding: 1rem;
  }

  .url-input {
    flex-direction: column;
  }

  .media-test-grid {
    grid-template-columns: 1fr;
  }

  .media-test-player-gif {
    max-width: 100%;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }
}