src/App.css

.app {
  display: flex;
  min-height: 100vh;
  background-color: #f5f7fa;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: #fff;
  border-bottom: 1px solid #e8eaed;
  display: flex;
  align-items: center;
  padding: 0 20px;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  background: #ff4757;
  color: white;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: bold;
}

.header-title {
  font-size: 18px;
  font-weight: 500;
  color: #333;
}

.header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #666;
  font-size: 14px;
}

/* Sidebar */
.sidebar {
  position: fixed;
  left: 0;
  top: 60px;
  width: 200px;
  height: calc(100vh - 60px);
  background: #fff;
  border-right: 1px solid #e8eaed;
  overflow-y: auto;
  z-index: 999;
}

.publish-btn {
  margin: 16px;
  background: #ff4757;
  color: white;
  padding: 10px 16px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  text-align: center;
  transition: background 0.2s;
}

.publish-btn:hover {
  background: #ff3742;
}

.nav-menu {
  padding: 0;
  list-style: none;
}

.nav-item {
  border-bottom: 1px solid #f0f0f0;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 12px 20px;
  color: #333;
  font-size: 14px;
  transition: all 0.2s;
  gap: 8px;
}

.nav-link:hover {
  background: #f8f9fa;
  color: #ff4757;
}

.nav-link.active {
  background: linear-gradient(135deg, #ff4757, #ff6b7a);
  color: white;
  font-weight: 500;
}

.nav-link.active .lucide {
  color: white;
}

.nav-submenu {
  padding-left: 20px;
  background: #fafafa;
}

.nav-submenu .nav-link {
  padding: 8px 20px;
  font-size: 13px;
  color: #666;
}

.nav-submenu .nav-link:hover {
  color: #ff4757;
}

/* Main Content */
.main-content {
  margin-left: 200px;
  padding-top: 60px;
  flex: 1;
  min-height: 100vh;
}

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

/* Upload Area */
.upload-tabs {
  display: flex;
  gap: 20px;
  margin-bottom: 30px;
  border-bottom: 1px solid #e8eaed;
}

.upload-tab {
  padding: 12px 0;
  font-size: 16px;
  color: #666;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.upload-tab.active {
  color: #ff4757;
  border-bottom-color: #ff4757;
  font-weight: 500;
}

.upload-area {
  background: #fff;
  border-radius: 8px;
  padding: 80px 40px;
  text-align: center;
  border: 2px dashed #ddd;
  margin-bottom: 40px;
  transition: all 0.2s;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
}

.upload-area:hover {
  border-color: #ff4757;
  background: #fff8f8;
}

.upload-area.drag-over {
  border-color: #ff4757;
  background: #fff0f0;
  transform: scale(1.02);
}

.upload-icon {
  width: 100px;
  height: 100px;
  margin: 0 auto 30px;
  background: #f8f9fa;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  color: #ccc;
  transition: all 0.3s ease;
}

.upload-area:hover .upload-icon {
  background: #ff475710;
  color: #ff4757;
  transform: scale(1.1);
}

.upload-area.drag-over .upload-icon {
  background: #ff475720;
  color: #ff4757;
  transform: scale(1.2);
}

.upload-title {
  font-size: 20px;
  color: #333;
  margin-bottom: 12px;
  font-weight: 500;
}

.upload-subtitle {
  font-size: 14px;
  color: #999;
  margin-bottom: 30px;
}

.upload-btn {
  background: #ff4757;
  color: white;
  padding: 14px 28px;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 500;
  transition: background 0.2s;
  min-width: 120px;
}

.upload-btn:hover:not(:disabled) {
  background: #ff3742;
}

.upload-btn:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.upload-btn.uploading {
  background: #ff4757;
  opacity: 0.8;
}

/* File Preview */
.file-preview-area {
  background: #fff;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 40px;
  border: 1px solid #e8eaed;
}

/* Preview Header */
.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.preview-title {
  font-size: 16px;
  color: #333;
  margin-bottom: 16px;
  font-weight: 500;
}

.clear-files-btn {
  background: #ff4757;
  color: white;
  padding: 6px 12px;
  border-radius: 4px;
  font-size: 12px;
  transition: background 0.2s;
}

.clear-files-btn:hover {
  background: #ff3742;
}

.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 16px;
}

.file-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px;
  border: 1px solid #f0f0f0;
  border-radius: 6px;
  transition: all 0.2s ease;
  position: relative;
}

.file-item:hover {
  border-color: #ff4757;
  box-shadow: 0 2px 8px rgba(255, 71, 87, 0.1);
}

.file-item:hover .remove-file-btn {
  opacity: 1;
}

.remove-file-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  background: rgba(255, 71, 87, 0.8);
  color: white;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: bold;
  opacity: 0;
  transition: all 0.2s;
}

.file-thumbnail {
  width: 80px;
  height: 80px;
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f8f9fa;
}

.file-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-thumbnail {
  color: #666;
}

.file-info {
  text-align: center;
  width: 100%;
}

.file-name {
  font-size: 12px;
  color: #333;
  margin-bottom: 4px;
  font-weight: 500;
}

.file-size {
  font-size: 11px;
  color: #999;
}

/* Upload Progress */
.progress-container {
  margin-top: 20px;
  width: 100%;
  max-width: 400px;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background-color: #f0f0f0;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #ff4757, #ff6b7a);
  border-radius: 4px;
  transition: width 0.3s ease;
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.progress-text {
  text-align: center;
  font-size: 12px;
  color: #666;
  font-weight: 500;
}

/* Upload Info */
.upload-info {
  display: flex;
  gap: 60px;
  justify-content: center;
  margin-top: 40px;
  padding: 20px;
  opacity: 1;
  transition: opacity 0.3s ease;
}

.upload-info.fade-in {
  animation: fadeIn 0.3s ease-in-out;
}

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

.info-item {
  text-align: center;
  flex: 1;
  max-width: 300px;
}

.info-title {
  font-size: 16px;
  color: #333;
  margin-bottom: 12px;
  font-weight: 500;
}

.info-desc {
  font-size: 13px;
  color: #666;
  line-height: 1.6;
}

/* Page Content Styles */
.page-content {
  padding: 40px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  margin: 20px 0;
  min-height: 500px;
}

.page-header {
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 1px solid #e8eaed;
}

.page-title {
  font-size: 24px;
  font-weight: 600;
  color: #333;
  margin: 0;
}

.page-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
}

.placeholder-content {
  text-align: center;
  max-width: 400px;
}

.placeholder-icon {
  color: #ff4757;
  margin-bottom: 20px;
  display: flex;
  justify-content: center;
}

.placeholder-title {
  font-size: 20px;
  font-weight: 500;
  color: #333;
  margin: 0 0 15px 0;
}

.placeholder-desc {
  font-size: 14px;
  color: #666;
  line-height: 1.6;
  margin: 0;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s;
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .header-title {
    display: none;
  }
  
  .upload-area {
    padding: 60px 20px;
    margin: 0 10px 30px;
  }
  
  .upload-info {
    flex-direction: column;
    gap: 30px;
    padding: 10px;
  }
  
  .content-wrapper {
    padding: 15px;
  }
  
  .upload-tabs {
    gap: 15px;
  }
  
  .page-content {
    padding: 20px;
    margin: 10px;
  }
  
  .page-title {
    font-size: 20px;
  }
  
  .placeholder-title {
    font-size: 18px;
  }
  
  .placeholder-desc {
    font-size: 13px;
  }
}