* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #f5f5f5;
            color: #333;
        }

        .navbar {
            background: white;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
            padding: 0 40px;
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 64px;
        }
        
        .logo {
            font-size: 20px;
            font-weight: 600;
            color: #2563eb;
        }
        
        .user-menu {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .user-avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            object-fit: cover;
        }
        
        .user-name {
            font-size: 14px;
            font-weight: 500;
        }
        
        .badge {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 12px;
            font-size: 11px;
            font-weight: 600;
            text-transform: uppercase;
        }
        
        .badge.admin {
            background: #fee2e2;
            color: #dc2626;
        }
        
        .badge.user {
            background: #dbeafe;
            color: #2563eb;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 40px 20px;
        }

        .login-container {
            min-height: 80vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .login-card {
            background: white;
            padding: 60px;
            border-radius: 8px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
            text-align: center;
            max-width: 400px;
            width: 100%;
        }
        
        .login-card h1 {
            font-size: 28px;
            margin-bottom: 10px;
            color: #111;
        }
        
        .login-card p {
            color: #666;
            margin-bottom: 40px;
            font-size: 14px;
        }

        .content {
            display: none;
        }
        
        .content.show {
            display: block;
        }
        
        .section {
            background: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
            margin-bottom: 20px;
        }
        
        .section h2 {
            font-size: 20px;
            margin-bottom: 20px;
            color: #111;
        }

        .upload-area {
            border: 2px dashed #e5e7eb;
            border-radius: 8px;
            padding: 30px;
            text-align: center;
            margin-bottom: 15px;
        }
        
        .upload-area input[type="file"] {
            display: none;
        }
        
        .upload-label {
            display: inline-block;
            padding: 10px 24px;
            background: #2563eb;
            color: white;
            border-radius: 6px;
            cursor: pointer;
            font-size: 14px;
            transition: background 0.2s;
        }
        
        .upload-label:hover {
            background: #1d4ed8;
        }
        
        .file-name {
            margin-top: 10px;
            font-size: 13px;
            color: #666;
        }

        .btn {
            padding: 10px 24px;
            border: none;
            border-radius: 6px;
            font-size: 14px;
            cursor: pointer;
            transition: all 0.2s;
            font-weight: 500;
        }
        
        .btn-primary {
            background: #2563eb;
            color: white;
        }
        
        .btn-primary:hover {
            background: #1d4ed8;
        }
        
        .btn-danger {
            background: #dc2626;
            color: white;
        }
        
        .btn-danger:hover {
            background: #b91c1c;
        }

        .alert {
            padding: 12px 16px;
            border-radius: 6px;
            margin: 15px 0;
            font-size: 14px;
        }
        
        .alert-success {
            background: #d1fae5;
            color: #065f46;
        }
        
        .alert-error {
            background: #fee2e2;
            color: #991b1b;
        }

        .hidden {
            display: none !important;
        }