* { margin: 0; padding: 0; box-sizing: border-box; }
        :root {
            --cream: #FDFFE5;
            --dark: #2a2a2a;
            --teal: #1a8b7f;
            --dark-teal: #0a5c54;
                    /* Spacing */
        --spacing-xs: 0.5rem;
        --spacing-sm: 1rem;
        --spacing-md: 1.5rem;
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;

        /* Border Radius */
        --radius-sm: 0.5rem;
        --radius-md: 0.75rem;
        --radius-lg: 1rem;
        --radius-xl: 1.5rem;

        /* Transitions */
        --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
        --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
        --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        body {
            font-family: 'Georgia', serif;
            background-color: var(--cream);
            color: var(--dark);
            line-height: 1.6;
        }

        .note {
            background-color: var(--dark-teal);
            border: 1px solid #ececec;
            border-radius: 30px;
            margin: 2rem auto;
            padding: 0.3rem;
            width: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 2rem;
        }

        .note p { color: #ebebeb; font-size: 0.9rem; }
        .note a { color: #bdbdbd; text-decoration: none; transition: color 0.3s; }
        .note a:hover { color: white; }

        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.5rem 3rem;
            z-index: 1000;
        }

        .logo { font-size: 1.2rem; font-weight: bold; letter-spacing: 1px; cursor: pointer; }

        nav {
            display: flex;
            gap: 1.5rem;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
        }

        nav a {
            text-decoration: none;
            color: var(--dark);
            font-size: 0.9rem;
            position: relative;
        }

        nav a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--teal);
            transition: width 0.3s;
        }

        nav a:hover::after { width: 100%; }

        .btnheader {
            display: flex;
            gap: 1rem;
        }

        .btn-header {
            background: var(--dark);
            color: white;
            padding: 0.7rem 1.8rem;
            border: none;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .btn-header:hover, .btn-header2:hover {
            background: var(--teal);
            transform: translateY(-2px);
        }

        .btn-header2 {
            color: var(--dark);
            padding: 0.7rem 1.8rem;
            border: none;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .hamburger { display: none; flex-direction: column; cursor: pointer; gap: 5px; }
        .hamburger span { width: 25px; height: 3px; background: var(--dark); border-radius: 3px; }

        .hero {
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
            padding: 4rem 2rem;
        }

        .hero h1 { font-size: 3.5rem; font-weight: 300; margin-bottom: 1rem; }

        .hero-meta {
            display: flex;
            justify-content: center;
            gap: 3rem;
            margin: 2rem 0;
            flex-wrap: wrap;
        }
        .meta-item{
            border: 1px solid #2a2a2a;
            border-radius: 12px;
            padding: 1rem;
        }

        .meta-dot {
            width: 6px;
            height: 6px;
            background: var(--teal);
            border-radius: 50%;
        }
        .hero-info span{
            padding: 2rem; 
        }

        .hero-buttons {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            margin: 3rem 0;
            flex-wrap: wrap;
        }

        .btn-primary {
            background: var(--dark);
            color: white;
            padding: 0.9rem 2rem;
            border: 2px solid var(--dark);
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .btn-primary:hover { background: white; color: var(--dark); }

        .btn-secondary {
            background: transparent;
            color: var(--dark);
            padding: 0.9rem 2rem;
            border: 2px solid var(--dark);
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .btn-secondary:hover { background: var(--dark); color: white; }

        .modal-overlay {
            display: none;
            position: fixed;
            top: 0; left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(4px);
            z-index: 2000;
            align-items: center;
            justify-content: center;
        }

        .modal-overlay.active { display: flex; }

        .modal {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            width: 90%;
            max-width: 400px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
            animation: slideUp 0.3s ease;
            position: relative;
        }

        @keyframes slideUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .modal-close {
            position: fixed;
            top: 2rem;
            right: 2rem;
            background: white;
            border: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: #666;
            padding: 0.5rem 1rem;
            border-radius: 8px;
            z-index: 2001;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            transition: all 0.3s;
        }

        .modal-close:hover {
            color: var(--dark);
            background: #f5f5f5;
        }

        .modal h2 { font-size: 1.5rem; margin-bottom: 0.5rem; }
        .modal-subtitle { color: #666; font-size: 0.9rem; margin-bottom: 1.5rem; }

        .form-group { margin-bottom: 1.2rem; }
        .form-group label { display: block; font-size: 0.9rem; margin-bottom: 0.5rem; font-weight: 500; }
        .form-group input {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 0.9rem;
            font-family: 'Georgia', serif;
        }

        .form-group input:focus { outline: none; border-color: var(--teal); }

        .btn-submit {
            width: 100%;
            background: var(--dark);
            color: white;
            padding: 0.9rem;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s;
            margin-top: 0.5rem;
        }

        .btn-submit:hover { background: var(--teal); }

        .modal-footer {
            text-align: center;
            margin-top: 1.5rem;
            font-size: 0.9rem;
        }

        .modal-footer a {
            color: var(--teal);
            text-decoration: none;
            cursor: pointer;
            font-weight: 500;
        }

        .error-message {
            background: #fee;
            color: #c33;
            padding: 0.8rem;
            border-radius: 8px;
            margin-bottom: 1rem;
            font-size: 0.85rem;
            display: none;
        }

        .error-message.show { display: block; }

        .dialog-overlay {
            display: none;
            position: fixed;
            top: 0; left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(4px);
            z-index: 3000;
            align-items: center;
            justify-content: center;
        }

        .dialog-overlay.active { display: flex; }

        .dialog-box {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            width: 90%;
            max-width: 450px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            animation: slideUp 0.3s ease;
        }

        .dialog-header { margin-bottom: 1.5rem; }
        .dialog-header h3 { font-size: 1.3rem; margin-bottom: 0.5rem; }
        .dialog-header p { color: #666; font-size: 0.9rem; }

        .dialog-input {
            width: 100%;
            padding: 0.9rem;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 0.95rem;
            margin: 1.5rem 0;
            font-family: 'Georgia', serif;
        }

        .dialog-input:focus {
            outline: none;
            border-color: var(--teal);
            box-shadow: 0 0 0 3px rgba(26, 139, 127, 0.1);
        }

        .dialog-buttons { display: flex; gap: 1rem; }

        .dialog-btn {
            flex: 1;
            padding: 0.8rem;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.3s;
        }

        .dialog-btn-cancel { background: #f0f0f0; color: var(--dark); }
        .dialog-btn-cancel:hover { background: #e0e0e0; }

        .dialog-btn-confirm { background: var(--dark); color: white; }
        .dialog-btn-confirm:hover { background: var(--teal); }

        .focus-section {
            padding: 5rem 3rem;
            background: var(--cream);
            text-align: center;
        }

        .section-title { font-size: 2.2rem; font-weight: 400; margin-bottom: 1rem; }

        .feature-boxes {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
        }

        .feature-box {
            background: white;
            padding: 2rem;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
        }

        .feature-box:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 25px rgba(0, 0, 0, 0.1);
        }

        .feature-box h3 { font-size: 1.1rem; margin-bottom: 0.8rem; }
        .feature-box p { font-size: 0.9rem; color: #666; }

        .page { display: none; }
        .page.active { display: block; }

        .dashboard-wrapper {
            display: grid;
            grid-template-columns: 220px 1fr;
            min-height: 100vh;
            background: var(--cream);
        }

        .sidebar {
            background: white;
            padding: 2rem 0;
            border-right: 1px solid #e0e0e0;
            overflow-y: auto;
            height: 100vh;
            position: sticky;
            top: 0;
            display: flex;
            flex-direction: column;
        }

        .sidebar-top { flex: 1; overflow-y: auto; }

        .sidebar-logo {
            padding: 0 1.5rem 1.5rem;
        }

        .sidebar-logo-main { font-size: 1.2rem; margin-bottom: 0.2rem; }
        .sidebar-logo-subtitle { font-size: 0.7rem; color: #666; font-weight: normal; }

        .sidebar-menu {
            list-style: none;
            padding: 0.5rem;
            margin: 0;
        }

        .sidebar-menu li {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 1.5rem;
            color: var(--dark);
            cursor: pointer;
            transition: all 0.3s;
            border-left: 3px solid transparent;
        }

        .sidebar-menu li:hover {
            background: #f5f5f5;
        }


        .sidebar-menu a {
            display: flex;
            align-items: center;
            color: var(--dark);
            text-decoration: none;
            cursor: pointer;
            transition: all 0.3s;
            font-size: 0.95rem;
            padding: 0.9rem 0;
            flex: 1;
        }

        .sidebar-menu a.active {
            font-weight: 500;
        }

        /* NEW: Soon tag styling */
        .sidebar-menu .soon {
            /* background-color: #b8b8b8; */
            color: #9b9b9b;
            border-radius: 4px;
            padding: 0.25rem 0.6rem;
            font-size: 0.55rem;
            font-weight: 600;
            white-space: nowrap;
            margin-left: 0.8rem;
            flex-shrink: 0;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .sidebar-divider { height: 1px; background: #e0e0e0; margin: 0 1.5rem; }

        .section-group { padding: 1.5rem 1.5rem; }

        .section-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.8rem 0;
            cursor: pointer;
            user-select: none;
            font-size: 0.85rem;
            font-weight: 600;
        }

        .section-header:hover { color: var(--teal); }

        .section-count {
            font-size: 0.75rem;
            color: #999;
            font-weight: normal;
            display: block;
        }
       /* ===== LAB MODULES STYLES ===== */
        .lab-modules-container {
            padding: 2rem;
            background: var(--cream);
            flex: 1;
            overflow-y: auto;
        }

        .lab-title {
            font-size: 2rem;
            margin-bottom: 2rem;
            color: var(--dark);
            text-align: center;
            font-weight: 400;
        }

        .modules-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }

        .module-card {
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .module-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 25px rgba(0, 0, 0, 0.1);
            border-left-color: var(--dark-teal);
        }

        .module-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 1rem;
        }

        .module-icon {
            font-size: 2.5rem;
        }

        .module-title {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--dark);
            margin-bottom: 0.5rem;
        }

        .module-description {
            font-size: 0.9rem;
            color: #666;
            margin-bottom: 1rem;
        }

        .submodules-list {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .submodule-item {
            padding: 0.6rem 0.8rem;
            background: #f5f5f5;
            border-radius: 6px;
            font-size: 0.85rem;
            color: #555;
            cursor: pointer;
            transition: all 0.2s;
        }

        .submodule-item:hover {
            background: var(--teal);
            color: white;
            padding-left: 1.2rem;
        }




        .dropdown-icon {
            font-size: 0.8rem;
            color: #999;
            transition: transform 0.3s;
        }

        .dropdown-icon.open { transform: rotate(180deg); }

        .section-items {
            max-height: 500px;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .section-items.collapsed { max-height: 0; }

        .chat-item, .project-item {
            padding: 0.5rem;
            cursor: pointer;
            transition: all 0.2s;
            font-size: 0.9rem;
            margin-bottom: 0.6rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-radius: 6px;
        }

        .chat-item:hover, .project-item:hover {
            background: #f5f5f5;
            color: var(--teal);

        }

        .chat-item.active, .project-item.active {
            background: #f5f5f5;
            color: var(--teal);
            font-weight: 500;
            padding: 0.5rem;
        }

        .chat-item-content {
            flex: 1;
            min-width: 0;
        }

        .chat-item-date {
            font-size: 0.7rem;
            color: #999;
            margin-bottom: 0.2rem;
        }

        .chat-item-text {
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .item-actions {
            display: none;
            gap: 0.2rem;
            align-items: center;
        }

        .chat-item:hover .item-actions, .project-item:hover .item-actions {
            display: flex;
        }

        .action-btn {
            background: none;
            border: none;
            cursor: pointer;
            color: #999;
            font-size: 1rem;
            padding: 0.2rem 0.4rem;
            transition: color 0.2s;
        }

        .action-btn:hover { color: var(--teal); }

        .sidebar-action-buttons {
            padding: 1rem 1.5rem;
            display: flex;
            gap: 0.8rem;
        }

        .sidebar-btn {
            flex: 0;
            padding: 1rem;
            border: none;
            border-radius: 50%;
            cursor: pointer;
            font-size: 1rem;
            transition: all 0.3s;
            font-weight: 300;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            
        }

        .sidebar-btn-new { background: var(--dark); color: white;}
        .sidebar-btn-new:hover { background: var(--teal); }

        .sidebar-btn-project { background: #e0e0e0; color: var(--dark); }
        .sidebar-btn-project:hover { background: #d0d0d0; }

        .sidebar-user {
            padding: 1rem 1.5rem 0 1.5rem;
            display: flex;
            gap: 0.8rem;
        }

        .user-avatar-large {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: #e74c3c;
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            flex-shrink: 0;
        }

        .user-info { flex: 1; min-width: 0; }
        .user-name { font-size: 0.85rem; font-weight: 500; }
        .user-email { font-size: 0.75rem; color: #999; }

        .main-content-wrapper {
            display: flex;
            flex-direction: column;
            background: var(--cream);
        }
        .chat-placeholder {
            text-align: center;
            color: #999;
            padding: 2rem;
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }
        .sidebar-section {
            text-align: center;
            color: #999;
            padding: 2rem;
            display: flex;
            flex-direction: column;
        }


        .chat-interface {
            flex: 1;
            display: flex;
            flex-direction: column;
            padding: 0;
        }

        .chat-main {
            flex: 1;
            display: flex;
            flex-direction: column;
            padding: 2rem;
        }

        .chat-messages-area {
            flex: 1;
            padding: 2rem;
            margin-bottom: 1rem;
            overflow-y: auto;
            display: flex;
            flex-direction: column;
            gap: 1rem;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
        }

        .chat-message-wrapper {
            display: flex;
            animation: slideIn 0.3s ease;
        }

        .chat-message-wrapper.user { justify-content: flex-end; }

        .chat-message {
            padding: 0.9rem 1.2rem;
            border-radius: 12px;
            max-width: 70%;
            word-wrap: break-word;
            line-height: 1.5;
        }
        .pdf-scroll-wrapper {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
            padding: 0.5rem;
            height: 100%;
            overflow-y: auto;

        }
        #filesRightSide {
            height: 100vh;          /* full viewport height */
            overflow-y: auto;       /* vertical scroll only */
            overflow-x: hidden;
        }


        .pdf-page-canvas {
            /* width: 100%; */
            height: auto;
            background: #fff;
            border-radius: 8px;
            box-shadow: 0 4px 18px rgba(0,0,0,0.15);
        }



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

        .chat-message.user { background: var(--teal); color: white; }
        .chat-message.ai { background: #f0f0f0; color: var(--dark); }

        .chat-input-section {
            padding: 1.5rem 2rem 2rem;
            background: var(--cream);
            display: flex;
        }

        .chat-input-area {
            background: white;
            border: 1px solid #ddd;
            border-radius: 16px;
            padding: 1rem;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
            width:70%;
            justify-content: center;
            align-items: center;
            margin: auto;
        }

        .chat-input-group {
            display: flex;
            gap: 0.8rem;
            align-items: flex-end;
        }

        .chat-input-wrapper {
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .chat-input-group textarea {
            flex: 1;
            padding: 0.8rem 0;
            border: none;
            font-family: 'Georgia', serif;
            resize: none;
            max-height: 100px;
            min-height: 40px;
            line-height: 1.5;
            background: transparent;
            font-size: 0.95rem;
        }

        .chat-input-group textarea:focus { outline: none; }
        .chat-input-group textarea::placeholder { color: #bbb; }

        .chat-input-buttons {
            display: flex;
            gap: 0.6rem;
            align-items: center;
            flex-wrap: wrap;
        }

        .chat-action-btn {
            background: white;
            border: 1px solid #ddd;
            color: var(--dark);
            padding: 0.6rem 1rem;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s;
            font-size: 0.8rem;
            font-weight: 500;
            white-space: nowrap;
        }

        .chat-action-btn:hover {
            background: #f5f5f5;
            border-color: var(--teal);
            color: var(--teal);
        }

        .chat-send-btn {
            background: var(--dark);
            color: white;
            border: none;
            width: 40px;
            height: 40px;
            border-radius: 12px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            transition: all 0.3s;
            flex-shrink: 0;
        }

        .chat-send-btn:hover { background: var(--teal); }



/* ===== FILES SECTION - ONLY CHANGES FOR PREVIEW ===== */
        #filesContent {
            height: 100% !important;
            padding: 0 !important;
        }

        .leftside {
            flex: 1;
            display: none;
            flex-direction: column;
            overflow: hidden;
            transition: flex var(--transition-base);
        }

        #filesContent.active .leftside {
            display: flex;
        }
        .leftside.preview-active {
            flex: 0 0 50%;
        }
        
        .files-container {
            display: flex;
            flex-direction: column;
            height: 100%;
            background: white;
        }

        .files-header {
            padding: 2rem;
            text-align: center;
            flex-shrink: 0;
            display: none;
        }

        #filesContent.active .files-header {
            display: block;
        }

        .files-header h2 {
            font-size: 1.5rem;
            margin-bottom: 0.5rem;
            color: var(--dark);
        }

        .files-header p {
            color: #999;
            font-size: 0.9rem;
        }

        .files-wrapper {
            overflow: hidden;
            display: flex;
            width: 100%;
            flex: 1;
        }

        .files-list-section {
            flex: 1;
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        .files-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
            gap: 1.5rem;
            padding: 2rem;
            overflow-y: auto;
            overflow-x: hidden;
        }

        .files-upload-section {
            padding: 2rem;
            flex-shrink: 0;
        }

        .upload-area {
            border: 2px dashed #ddd;
            border-radius: 12px;
            padding: 2rem;
            text-align: center;
            cursor: pointer;
            background: white;
            transition: all 0.3s;
            width: 200px;
            margin: auto;
        }

        .upload-area:hover {
            border-color: var(--teal);
            background: #fafafa;
        }

        .upload-area.drag-over {
            border-color: var(--teal);
            background: #f0f8f7;
        }

        .rightside {
            flex: 0 0 0%;
            display: none;
            transition: flex var(--transition-base);
            overflow: hidden;
            opacity: 0;
            pointer-events: none;
            background: white;
        }

        #filesContent.active .rightside {
            display: flex;
        }

        #filesContent.active .rightside.preview-active {
            flex: 0 0 50%;
            opacity: 1;
            pointer-events: auto;
        }

        .files-preview-section {
            display: flex;
            flex-direction: column;
            width: 100%;
            height: 100%;
            overflow: hidden;
            background: white;
            border-left: 2px solid #e0e0e0;
        }

        .files-preview-header {
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 0.5rem 1rem;
            flex-shrink: 0;
            background: white;
        }

        .files-preview-title {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--dark);
            word-break: break-word;
        }

        .preview-close-btn {
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #999;
            cursor: pointer;
            transition: all 0.3s;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 6px;
            flex-shrink: 0;
            margin: 1rem;
        }

        .preview-close-btn:hover {
            background: #f5f5f5;
            color: var(--dark);
        }

        .files-preview-content {
            flex: 1;
            overflow: auto;
            padding: 2rem;
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
            background: white;
        }

        .files-preview-content::-webkit-scrollbar {
            width: 8px;
        }

        .files-preview-content::-webkit-scrollbar-track {
            background: transparent;
        }

        .files-preview-content::-webkit-scrollbar-thumb {
            background: #ddd;
            border-radius: 4px;
        }

        .files-preview-content::-webkit-scrollbar-thumb:hover {
            background: #999;
        }

        .preview-pdf {
            width: 100%;
            height: calc(100vh - 120px);
            border-radius: 8px;
        }

        .preview-image {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
        }

        .preview-info {
            padding: 1.5rem;
            background: #f9f9f9;
            border-radius: 8px;
            border: 1px solid #e0e0e0;
            font-size: 0.9rem;
        }

        .preview-info-item {
            margin-bottom: 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .preview-info-item:last-child {
            margin-bottom: 0;
        }

        .preview-info-label {
            color: #999;
            font-weight: 500;
            font-size: 0.9rem;
        }

        .preview-info-value {
            color: var(--dark);
            font-weight: 500;
        }

        @media (max-width: 768px) {
            .note { width: 85%; }
            header { padding: 1rem 1.5rem; }
            nav { display: none; }
            nav.active { display: flex; }
            .hamburger { display: flex; }
            .hero h1 { font-size: 2rem; }
            .dashboard-wrapper { grid-template-columns: 1fr; }
            .sidebar {
                position: fixed;
                left: -220px;
                top: 0;
                width: 220px;
                height: 100vh;
                z-index: 1500;
                transition: left 0.3s;
            }
            .sidebar.active { left: 0; }
            .chat-message { max-width: 85%; }
            .rightside { display: none !important; }
        }

.hidden { display: none !important; }
        .content-section { display: none; }
        .content-section.active { display: flex; flex-direction: column; }
        
        #filesContent.active {
            display: flex !important;
            flex-direction: row !important;
        }
        
        #chatbotContent.active,
        #labContent.active,
        #wetLabContent.active,
        #supportContent.active,
        #settingsContent.active,
        #homeContent.active {
            display: flex !important;
            flex-direction: column !important;
        }