diff --git a/src/App.css b/src/App.css
new file mode 100644
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+++ b/src/App.css
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+.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;
+  }
+}