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

body::-webkit-scrollbar {
    width: 10px;
}

body::-webkit-scrollbar-thumb {
    height: 80px;
    background: #375666;
    border: 8px solid transparent;
    border-radius: 12px;
}

body::-webkit-scrollbar-thumb:active {
    background: #003349;
}

body {
    font-family: 'Arial', sans-serif;
    background: #1f1e1e;
    color: #dcdee1;
    transition: background-color 0.3s ease-in-out;
}

li {
    list-style: none;
}

section {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    padding: 40px 20px;
    min-height: 100vh;
    transition: padding 0.3s ease;
}

.title {
    display: none;
}

.container {
    position: relative;
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.03);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    animation: fadeIn 1s ease-out;
    margin-bottom: 20px;
}

.video-column {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.video-wrapper {
  position: relative;
    width: 100%;
    height: 470px;
    overflow: hidden;
    outline: none;
    border-radius: 8px;
    transition: transform 0.3s ease;
}

.current-title {
  text-align: center;
  background: rgba(55, 86, 102, 0.2);
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 16px;
  color: white;
  transition: opacity 0.3s ease;
  max-width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 10px;
  backdrop-filter: blur(5px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

#videoPlayer {
    width: 100%;
    height: 100%;
    border: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0.2) 0%, transparent 100%);
    pointer-events: none;
}

.playlistBx {
    position: relative;
    height: 470px; 
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    padding: 15px;
    animation: slideIn 1s ease-out;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    pointer-events: none;
}

.playlist {
    position: relative;
    width: 100%;
    height: calc(100% - 40px); 
    overflow-y: auto;
    border-top: 2px solid rgba(220, 222, 225, 0.1);
    opacity: 0;
    animation: fadeIn 1s ease-in forwards;
    pointer-events: all;
}

.playlist::-webkit-scrollbar {
    width: 5px;
}

.playlist::-webkit-scrollbar-thumb {
    background: #375666;
    border-radius: 5px;
}

.playlistBx .row .AllLessons {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #dcdee1;
    font-size: 18px;
    font-weight: 700;
    padding: 10px;
    animation: fadeIn 2s ease-out;
}

.playlist li {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    margin: 8px 0;
    padding: 12px 15px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.playlist li:hover {
    background: rgba(60, 62, 64, 0.8);
    transform: translateX(5px);
}

.playlist li:focus {
    outline: 2px solid #375666;
    outline-offset: 2px;
}

.playlist li:active {
    transform: scale(0.98);
}

.playlist li .row span {
    font-size: 14px;
    color: #f0f0f0; 
    transition: all 0.3s ease;
}

.playlist li .row span::before {
    content: '\f01d';
    font-family: FontAwesome;
    color: #375666;
    margin-right: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.playlist li.playing {
    background: #375666;
    transform: scale(1.02);
}

.playlist li.playing .row span::before {
    content: '\f28c';
    color: #fff;
}

.playlist li.playing .row span {
    color: #fff;
}

.main-header {
  background: #2b2929;
  backdrop-filter: blur(10px);
  padding: 15px 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
}

.left-space {
  width: 40px; /* Match share button width */
}

.center-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  color: #dcdee1;
  animation: fadeIn 1s ease-out;
}

.center-logo i {
  color: #375666;
  font-size: 28px;
}

.center-logo span {
  font-weight: bold;
  letter-spacing: 1px;
}

.share-button button {
  background: none;
  border: none;
  color: #dcdee1;
  font-size: 20px;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.share-button button:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: scale(1.1);
}

.share-button button:active {
  transform: scale(0.95);
}

.categories-nav {
  background: rgb(0 0 0 / 10%);
  padding: 0 20px;
  position: relative;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.categories-list {
  display: flex;
  gap: 30px;
  position: relative;
  padding: 15px 0;
}

.category-item {
  color: #dcdee1;
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 20px;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
}

.category-item i {
  font-size: 14px;
  color: #375666;
  transition: color 0.3s ease;
}

.category-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

.category-item.active {
  background: rgba(55, 86, 102, 0.2);
}

.category-item.active i {
  color: #dcdee1;
}

.category-indicator {
  position: absolute;
  bottom: -1px;
  left: 0;
  height: 2px;
  width: 100px;
  background: #375666;
  transition: transform 0.3s ease;
}

.refresh-button {
  background: rgb(143, 4, 4);;
  color: #fff;
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  transition: all 0.3s ease;
  margin: 20px auto 0;
}

.refresh-button:hover {
  background: #2a4251;
  transform: translateY(-2px);
}

.refresh-button:active {
  transform: translateY(0);
}

.refresh-button i {
  font-size: 16px;
}

.optimization-notice {
  margin-top: 20px;
  background: rgba(55, 86, 102, 0.1);
  border-radius: 10px;
  padding: 15px 20px;
  display: flex;
  align-items: center;
  gap: 15px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeIn 0.5s ease-out;
  border: 1px solid rgba(55, 86, 102, 0.2);
}

.optimization-notice i {
  font-size: 24px;
  color: #375666;
}

.notice-content {
  flex: 1;
}

.notice-content h3 {
  color: #dcdee1;
  font-size: 16px;
  margin-bottom: 5px;
  font-weight: 600;
}

.notice-content p {
  color: #a0a3a7;
  font-size: 14px;
  line-height: 1.4;
}

.live-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 0, 0, 0.2);
  padding: 8px 16px;
  border-radius: 20px;
  margin: 20px 0;
  animation: pulse 2s infinite;
}

.live-badge i {
  color: #ff0000;
  font-size: 12px;
}

.live-badge span {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.8;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.progress-container {
  position: fixed;
  top: 0;
  z-index: 1100;
  width: 100%;
  background-color: transparent;
}

.progress-bar {
  height: 4px;
  background: linear-gradient(90deg, #375666, #4a7689, #2a4251);
  width: 0;
  position: absolute;
  top: 0;
  left: 0;
  transition: width 0.3s ease;
  box-shadow: 0 0 10px rgba(55, 86, 102, 0.7);
  animation: progress-pulse 2s infinite;
}

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

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: #375666;
  color: white;
  padding: 10px;
  z-index: 1000;
  transition: top 0.3s ease;
}

.skip-link:focus {
  top: 0;
  outline: 2px solid white;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

a:focus, 
button:focus, 
input:focus, 
select:focus {
  outline: 2px solid #375666;
  outline-offset: 2px;
}

@media(max-width: 1092px) {
    section {
        padding: 30px 20px;
    }
    .container {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    .video-wrapper {
        height: 415px;
    }
    .playlistBx {
        height: 470px; 
    }
    .video-column {
        gap: 10px;
    }
}

@media(max-width: 768px) {
  .categories-nav {
    padding: 0 15px;
  }
  
  .categories-list {
    gap: 15px;
  }
  
  .category-item {
    font-size: 14px;
    padding: 6px 12px;
  }
  
  .optimization-notice {
    margin: 20px 15px;
    flex-direction: column;
    text-align: center;
    padding: 20px;
  }
  
  .optimization-notice i {
    margin-bottom: 10px;
  }
  section {
    padding: 25px 15px;
  }
  .ad-container {
    margin: 15px auto;
    padding: 0 15px;
  }
  .current-title {
    font-size: 14px;
    padding: 10px 15px;
  }
}

@media(max-width: 650px) {
    .video-wrapper {
        height: 350px;
    }
}

@media screen and (-ms-high-contrast: active) {
  body {
    background: black;
    color: white;
  }
  
  .playlist li {
    border: 2px solid white;
  }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from { transform: translateX(30px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.share-popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  background: #333;
  backdrop-filter: blur(10px);
  padding: 30px;
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.share-popup.active {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
}

.share-popup h3 {
  color: #fff;
  font-size: 18px;
  margin-bottom: 20px;
  text-align: center;
}

.share-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  padding: 10px;
}

.share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 15px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  width: 60px;
  height: 60px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  background: #333;
}

.share-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
  filter: brightness(1.1);
}

.share-btn:active {
  transform: scale(0.95);
}

.share-btn i {
  font-size: 24px;
}

.share-btn.whatsapp i { color: #25D366; }
.share-btn.facebook i { color: #3B5998; }
.share-btn.telegram i { color: #0088CC; }
.share-btn.email i { color: #EA4335; }
.share-btn.copy i { color: #375666; }

.share-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(3px);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.share-overlay.active {
  opacity: 1;
  visibility: visible;
}

.close-share {
  position: absolute;
  top: 15px;
  right: 15px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  width: 35px;
  height: 35px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.close-share:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: rotate(90deg);
}

.copy-alert {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #333;
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  opacity: 0;
  transition: all 0.3s ease;
}

.copy-alert.active {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.keyboard-hint {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100%);
  background: rgba(55, 86, 102, 0.95);
  backdrop-filter: blur(10px);
  padding: 15px 20px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0;
  z-index: 1000;
}

.keyboard-hint.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.hint-content {
  display: flex;
  align-items: center;
  gap: 15px;
}

.hint-content i {
  font-size: 24px;
  color: #dcdee1;
}

.hint-text {
  color: #fff;
}

.hint-text span {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 5px;
  display: block;
}

.hint-text ul {
  list-style: none;
  padding: 0;
  margin: 5px 0 0 0;
}

.hint-text ul li {
  font-size: 13px;
  margin: 3px 0;
  color: #dcdee1;
}

@media (hover: none) {
  .keyboard-hint {
    display: none;
  }
}

.video-transition {
  opacity: 0;
  transform: scale(0.98);
}