/* ===================================
   SISTEMA DE DISEÑO - VARIABLES CSS
   =================================== */
:root {
  /* Colores principales */
  --yt-primary: #ff0000;
  --yt-primary-dark: #cc0000;
  --yt-bg-main: #0f0f0f;
  --yt-bg-secondary: #212121;
  --yt-bg-hover: #2d2d2d;
  --yt-text-primary: #ffffff;
  --yt-text-secondary: #aaaaaa;
  --yt-border: #3f3f3f;

  /* Gradientes */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-dark: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  --gradient-overlay: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0) 0%,
    rgba(0, 0, 0, 0.7) 100%
  );

  /* Sombras */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.3);

  /* Transiciones */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Espaciado */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
}

/* ===================================
   CONTENEDOR PRINCIPAL
   =================================== */
.video-player-wrapper {
  background: linear-gradient(135deg, #667eea22 0%, #764ba222 100%);
  min-height: 100vh;
  padding: var(--spacing-xl) 0;
}

.video-header {
  background: var(--gradient-dark);
  border-radius: 16px;
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.video-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23667eea" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,154.7C960,171,1056,181,1152,170.7C1248,160,1344,128,1392,112L1440,96L1440,0L1392,0C1344,0,1248,0,1152,0C1056,0,960,0,864,0C768,0,672,0,576,0C480,0,384,0,288,0C192,0,96,0,48,0L0,0Z"></path></svg>')
    no-repeat;
  background-size: cover;
  opacity: 0.3;
}

.video-header h2 {
  position: relative;
  z-index: 1;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
}

/* ===================================
   BARRA DE BÚSQUEDA MODERNA
   =================================== */
.search-container {
  margin-bottom: var(--spacing-xl);
}

.search-bar-modern {
  position: relative;
  max-width: 600px;
  margin: 0 auto;
}

.search-bar-modern input {
  width: 100%;
  padding: 14px 50px;
  border: 2px solid rgba(102, 126, 234, 0.3);
  border-radius: 50px;
  font-size: 16px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.search-bar-modern input:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1), var(--shadow-lg);
  transform: translateY(-2px);
}

.search-bar-modern .search-icon {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: #667eea;
  font-size: 18px;
  pointer-events: none;
}

.search-bar-modern .clear-search {
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: #999;
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  transition: all var(--transition-fast);
}

.search-bar-modern input:not(:placeholder-shown) ~ .clear-search {
  opacity: 1;
}

.search-bar-modern .clear-search:hover {
  color: #667eea;
  transform: translateY(-50%) scale(1.2);
}

/* ===================================
   REPRODUCTOR PRINCIPAL
   =================================== */
.main-player-container {
  background: #fff;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  transition: transform var(--transition-normal);
}

.main-player-container:hover {
  transform: translateY(-4px);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

.video-player-frame {
  position: relative;
  background: #000;
  border-radius: 16px 16px 0 0;
  overflow: hidden;
}

.video-player-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%; /* 16:9 aspect ratio */
}

.video-player-frame iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-info-section {
  padding: var(--spacing-xl);
  background: linear-gradient(to bottom, #ffffff 0%, #f8f9fa 100%);
}

.video-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: var(--spacing-sm);
  line-height: 1.3;
}

.video-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  color: #666;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.video-meta-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.video-meta-item i {
  color: #667eea;
}

.video-description {
  color: #555;
  line-height: 1.6;
  max-height: 60px;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.video-description.expanded {
  max-height: 500px;
}

.expand-description-btn {
  margin-top: var(--spacing-sm);
  background: none;
  border: none;
  color: #667eea;
  font-weight: 600;
  cursor: pointer;
  padding: var(--spacing-sm) 0;
  transition: all var(--transition-fast);
}

.expand-description-btn:hover {
  color: #764ba2;
  transform: translateX(4px);
}

/* ===================================
   LISTA DE VIDEOS
   =================================== */
.playlist-container {
  background: #fff;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.playlist-header {
  background: var(--gradient-primary);
  color: white;
  padding: var(--spacing-lg);
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.playlist-body {
  max-height: 600px;
  overflow-y: auto;
  padding: var(--spacing-sm);
}

/* Scrollbar personalizada */
.playlist-body::-webkit-scrollbar {
  width: 8px;
}

.playlist-body::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 10px;
}

.playlist-body::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 10px;
}

.playlist-body::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}

/* ===================================
   TARJETAS DE VIDEO
   =================================== */
.video-card {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: 12px;
  cursor: pointer;
  transition: all var(--transition-normal);
  margin-bottom: var(--spacing-sm);
  position: relative;
  background: #fff;
  border: 2px solid transparent;
}

.video-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, #667eea22 0%, #764ba222 100%);
  border-radius: 12px;
  opacity: 0;
  transition: opacity var(--transition-normal);
  z-index: 0;
}

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

.video-card:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: rgba(102, 126, 234, 0.3);
}

.video-card.active {
  background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
  border-color: #667eea;
  transform: translateX(8px);
}

.video-card.active::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-primary);
  border-radius: 0 4px 4px 0;
}

.video-thumbnail {
  position: relative;
  flex-shrink: 0;
  width: 140px;
  height: 80px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  z-index: 1;
}

.video-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.video-card:hover .video-thumbnail img {
  transform: scale(1.1);
}

.video-thumbnail-overlay {
  position: absolute;
  inset: 0;
  background: var(--gradient-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

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

.play-icon {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #667eea;
  font-size: 18px;
  box-shadow: var(--shadow-md);
  transform: scale(0.8);
  transition: transform var(--transition-fast);
}

.video-card:hover .play-icon {
  transform: scale(1);
}

.video-duration-badge {
  position: absolute;
  bottom: 6px;
  right: 6px;
  background: rgba(0, 0, 0, 0.85);
  color: white;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  backdrop-filter: blur(4px);
}

.video-details {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  z-index: 1;
}

.video-card-title {
  font-weight: 600;
  color: #1a1a1a;
  font-size: 0.95rem;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--spacing-xs);
}

.video-card.active .video-card-title {
  color: #667eea;
}

.video-card-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: #666;
  font-size: 0.85rem;
}

.video-card-date {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ===================================
   ESTADOS Y ANIMACIONES
   =================================== */
.loading-skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 8px;
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

.fade-in {
  animation: fadeIn var(--transition-normal) ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.pulse-animation {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 991px) {
  .video-header h2 {
    font-size: 1.5rem;
  }

  .playlist-container {
    margin-top: var(--spacing-xl);
  }

  .video-thumbnail {
    width: 120px;
    height: 68px;
  }
}

@media (max-width: 767px) {
  .video-player-wrapper {
    padding: var(--spacing-md) 0;
  }

  .video-header {
    padding: var(--spacing-lg);
    border-radius: 12px;
  }

  .video-info-section {
    padding: var(--spacing-lg);
  }

  .video-title {
    font-size: 1.2rem;
  }

  .search-bar-modern input {
    padding: 12px 45px;
    font-size: 14px;
  }

  .video-card {
    padding: var(--spacing-sm);
  }

  .video-thumbnail {
    width: 100px;
    height: 56px;
  }

  .video-card-title {
    font-size: 0.9rem;
    -webkit-line-clamp: 3;
  }
}

@media (max-width: 575px) {
  .video-meta {
    font-size: 0.85rem;
  }

  .playlist-body {
    max-height: 400px;
  }

  .video-card {
    flex-direction: column;
  }

  .video-thumbnail {
    width: 100%;
    height: 160px;
  }
}

/* ===================================
   UTILIDADES
   =================================== */
.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass-effect {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.no-results {
  text-align: center;
  padding: var(--spacing-xl);
  color: #999;
}

.no-results i {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: #ddd;
}