body {
  font-family: 'Arial', sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f0f2f5; 
  color: #333;
  display: flex;
  flex-direction: column; 
  align-items: center; 
  min-height: 100vh;
  direction: rtl;
}

.header {
  background-color: #0056b3; 
  color: white;
  padding: 20px 0; 
  text-align: center;
  margin-bottom: 20px; 
  width: 100%;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2); 
}

.header h1 {
  margin: 0;
  font-size: 2em; 
  font-weight: bold; 
}

.container {
  display: flex;
  width: 90%;
  max-width: 1200px;
  margin: 0 20px 20px 20px; 
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  overflow: hidden;
  background-color: #fff;
}

.sidebar {
  width: 300px;
  background-color: #f9f9f9;
  border-left: 1px solid #eee;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.input-section {
  margin-bottom: 20px;
}

.input-section input[type="file"],
.input-section input[type="url"],
#searchChannels,
#loadPlaylistBtn {
  margin-bottom: 10px;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  width: calc(100% - 22px); 
  box-sizing: border-box;
  font-size: 1em; 
}

#loadPlaylistBtn {
  background-color: #007bff; 
  color: white;
  border: none;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#loadPlaylistBtn:hover {
  background-color: #0056b3; 
}

#searchChannels {
  margin-bottom: 15px;
}

#channelsList {
  list-style: none;
  padding: 0;
  margin: 0;
  overflow-y: auto; 
  flex-grow: 1; 
}

#channelsList li {
  padding: 12px 15px; 
  border-bottom: 1px solid #eee;
  cursor: pointer;
  transition: background-color 0.2s ease;
  font-size: 1em; 
}

#channelsList li:last-child {
  border-bottom: none;
}

#channelsList li:hover {
  background-color: #e0e0e0;
}

.main-content {
  flex-grow: 1;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

#mainVideoPlayer {
  width: 100%;
  max-height: 600px; 
  margin-bottom: 20px;
  border-radius: 8px; 
  background-color: #000; 
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); 
}

.ad-space {
  background-color: #e8f0fe; 
  color: #555; 
  text-align: center;
  padding: 15px; 
  border-radius: 4px;
  margin-bottom: 10px; 
  font-size: 0.9em; 
  border: 1px dashed #ccd9e6; 
}

.ad-space.top-ad {
  order: -1; 
}

.ad-space.bottom-ad {
  /* Default order is fine, appears below video */
}

/* Mobile responsiveness */
@media (max-width: 768px) {
  .container {
    flex-direction: column;
    width: 95%;
  }

  .sidebar {
    width: 100%;
    border-left: none;
    border-bottom: 1px solid #eee;
  }

  #channelsList {
    max-height: 300px; 
  }

  .main-content {
    padding: 10px;
  }

  #mainVideoPlayer {
    max-height: 400px; 
    border-radius: 6px; 
  }

  .ad-space {
    padding: 10px; 
    font-size: 0.85em; 
  }

  .header {
    padding: 15px 0; 
    margin-bottom: 10px; 
  }

  .header h1 {
    font-size: 1.75em; 
  }
}