* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: #ffffff;
            min-height: 100vh;
            overflow-x: hidden;
            padding-top: 80px; /* Account for fixed header */
        }

        /* ===== HEADER STYLES START ===== */
        
        /* Header Section - Transparent with dynamic text colors */
        .exp1s5-site-header {
            --header-bg-image: url('https://explerify.com/wp-content/uploads/2025/06/back.jpg');
            --header-bg-position: top center;
        
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-image: var(--header-bg-image);
            background-repeat: no-repeat;
            background-size: cover;
            background-position: var(--header-bg-position);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.2);
            z-index: 1000;
            transition: all 0.3s ease;
            box-shadow: 0 4px 20px rgba(255, 255, 255, 0.1);
        }

        .exp1s5-site-header.exp1s5-scrolled {
            background-repeat: no-repeat;
            background-size: cover;
            backdrop-filter: blur(30px);
            box-shadow: 0 8px 30px rgba(255, 255, 255, 0.2);
        }
        
        .exp1s5-site-header.exp1s5-transparent-header {
            background-repeat: no-repeat;
            background-size: cover;
            backdrop-filter: blur(15px) !important;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1) !important;
            box-shadow: 0 4px 20px rgba(255, 255, 255, 0.05) !important;
        }

        .exp1s5-site-header.exp1s5-transparent-header.exp1s5-scrolled {
            background-repeat: no-repeat;
            background-size: cover;
            backdrop-filter: blur(25px) !important;
            box-shadow: 0 8px 30px rgba(255, 255, 255, 0.1) !important;
        }
        
        .exp1s5-header-container {
            max-width: none;
            margin: 0 auto;
            padding: 0 clamp(1rem, 3vw, 2rem);
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 80px;
        }

        /* Logo Section */
        .exp1s5-logo {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            color: white;
            text-decoration: none;
            font-weight: 800;
            font-size: 1.6rem;
            font-family: 'League Spartan', sans-serif;
            transition: all 0.3s ease;
        }

        .exp1s5-logo:hover {
            transform: scale(1.05);
            filter: brightness(1.1);
        }

        .exp1s5-logo-icon {
            width: 60px;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        /* Atom Structure */
        .exp1s5-atom {
            position: relative;
            width: 55px;
            height: 55px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .exp1s5-nucleus {
            width: 12px;
            height: 12px;
            background: #ffffff;
            border-radius: 50%;
            position: absolute;
            box-shadow: 0 0 24px rgba(255, 255, 255, 0.8);
            z-index: 10;
            animation: nucleusPulse 2s ease-in-out infinite alternate;
        }

        .exp1s5-nucleus::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 0;
            height: 0;
            border-left: 6px solid #012051;
            border-top: 4px solid transparent;
            border-bottom: 4px solid transparent;
        }

        .exp1s5-orbit {
            position: absolute;
            border: 2px solid rgba(255, 255, 255, 0.5);
            border-radius: 50%;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .exp1s5-orbit-1 {
            width: 50px;
            height: 22px;
            transform: translate(-50%, -50%) rotate(0deg);
        }

        .exp1s5-orbit-2 {
            width: 50px;
            height: 22px;
            transform: translate(-50%, -50%) rotate(60deg);
        }

        .exp1s5-orbit-3 {
            width: 50px;
            height: 22px;
            transform: translate(-50%, -50%) rotate(120deg);
        }

        .exp1s5-electron {
            width: 5px;
            height: 5px;
            background: #4fc3f7;
            border-radius: 50%;
            position: absolute;
            box-shadow: 0 0 10px rgba(79, 195, 247, 0.8);
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .exp1s5-electron-1 {
            animation: exp1s5-electronOrbit1 3s linear infinite;
        }

        .exp1s5-electron-2 {
            animation: exp1s5-electronOrbit2 4s linear infinite;
        }

        .exp1s5-electron-3 {
            animation: exp1s5-electronOrbit3 5s linear infinite;
        }

        /* Electron orbit animations */
        @keyframes exp1s5-electronOrbit1 {
            0% { transform: translate(-50%, -50%) translateX(22px) translateY(0px); }
            25% { transform: translate(-50%, -50%) translateX(0px) translateY(-8px); }
            50% { transform: translate(-50%, -50%) translateX(-22px) translateY(0px); }
            75% { transform: translate(-50%, -50%) translateX(0px) translateY(8px); }
            100% { transform: translate(-50%, -50%) translateX(22px) translateY(0px); }
        }

        @keyframes exp1s5-electronOrbit2 {
            0% { transform: translate(-50%, -50%) rotate(60deg) translateX(22px) translateY(0px) rotate(-60deg); }
            25% { transform: translate(-50%, -50%) rotate(60deg) translateX(0px) translateY(-8px) rotate(-60deg); }
            50% { transform: translate(-50%, -50%) rotate(60deg) translateX(-22px) translateY(0px) rotate(-60deg); }
            75% { transform: translate(-50%, -50%) rotate(60deg) translateX(0px) translateY(8px) rotate(-60deg); }
            100% { transform: translate(-50%, -50%) rotate(60deg) translateX(22px) translateY(0px) rotate(-60deg); }
        }

        @keyframes exp1s5-electronOrbit3 {
            0% { transform: translate(-50%, -50%) rotate(120deg) translateX(22px) translateY(0px) rotate(-120deg); }
            25% { transform: translate(-50%, -50%) rotate(120deg) translateX(0px) translateY(-8px) rotate(-120deg); }
            50% { transform: translate(-50%, -50%) rotate(120deg) translateX(-22px) translateY(0px) rotate(-120deg); }
            75% { transform: translate(-50%, -50%) rotate(120deg) translateX(0px) translateY(8px) rotate(-120deg); }
            100% { transform: translate(-50%, -50%) rotate(120deg) translateX(22px) translateY(0px) rotate(-120deg); }
        }

        @keyframes nucleusPulse {
            0% { 
                transform: scale(1);
                box-shadow: 0 0 8px rgba(255, 255, 255, 0.8);
            }
            100% { 
                transform: scale(1.2);
                box-shadow: 0 0 12px rgba(255, 255, 255, 1);
            }
        }

        .exp1s5-logo-text {
            display: flex;
            flex-direction: column;
            line-height: 1.2;
        }

        .exp1s5-logo-main {
            font-size: 1em;
            font-weight: 800;
        }

        .exp1s5-logo-tagline {
            font-size: 0.65em;
            opacity: 0.9;
            font-weight: 400;
            letter-spacing: 0.5px;
        }

        /* Navigation */
        .exp1s5-main-nav {
            display: flex;
            align-items: center;
            gap: clamp(1.5rem, 4vw, 3rem);
        }

        .exp1s5-nav-links {
            display: flex;
            align-items: center;
            gap: clamp(1.5rem, 4vw, 2.5rem);
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .exp1s5-nav-links li {
            position: relative;
        }

        .exp1s5-nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            font-size: clamp(0.9rem, 2.5vw, 1rem);
            padding: 0.5rem 0;
            transition: all 0.3s ease;
            position: relative;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .exp1s5-nav-links a::before {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0.4));
            transition: width 0.3s ease;
        }

        .exp1s5-nav-links a:hover::before,
        .exp1s5-nav-links a.exp1s5-active::before {
            width: 100%;
        }

        .exp1s5-nav-links a:hover {
            color: rgba(255, 255, 255, 0.9);
            transform: translateY(-1px);
            text-shadow: 0 2px 8px rgba(255, 255, 255, 0.3);
        }

        .exp1s5-nav-links a.exp1s5-active {
            color: white;
            text-shadow: 0 2px 8px rgba(255, 255, 255, 0.4);
        }

        /* Auth Section Styles */
        .exp1s5-auth-section {
            position: relative;
        }

        .exp1s5-auth-buttons {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-left: 1rem;
        }

        .exp1s5-auth-btn {
            padding: 0.6rem 1.5rem;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            border: 2px solid transparent;
        }

        .exp1s5-login-btn {
            color: white;
            background: transparent;
            border-color: rgba(255, 255, 255, 0.3);
        }

        .exp1s5-login-btn:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.5);
            transform: translateY(-1px);
            box-shadow: 0 4px 15px rgba(255, 255, 255, 0.2);
        }

        .exp1s5-signup-btn {
            color: #4a90e2;
            background: white;
            border-color: white;
        }

        .exp1s5-signup-btn:hover {
            background: rgba(255, 255, 255, 0.9);
            transform: translateY(-1px);
            box-shadow: 0 4px 15px rgba(255, 255, 255, 0.3);
        }

        /* User Profile Styles */
        .exp1s5-user-profile {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            margin-left: 1rem;
            position: relative;
            cursor: pointer;
            padding: 0.5rem;
            border-radius: 12px;
            transition: all 0.3s ease;
        }

        .exp1s5-user-profile:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .exp1s5-user-avatar-container {
            position: relative;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            overflow: hidden;
            background: rgba(255, 255, 255, 0.1);
            border: 2px solid rgba(255, 255, 255, 0.3);
            transition: all 0.3s ease;
        }

        .exp1s5-user-profile:hover .exp1s5-user-avatar-container {
            border-color: rgba(255, 255, 255, 0.6);
            transform: scale(1.05);
        }

        .exp1s5-user-avatar {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: all 0.3s ease;
        }

        .exp1s5-user-avatar-fallback {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.1));
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.2rem;
            font-weight: 600;
        }

        .exp1s5-user-avatar-fallback svg {
            width: 20px;
            height: 20px;
            opacity: 0.8;
        }

        .exp1s5-user-avatar:not([src=""]) + .exp1s5-user-avatar-fallback {
            display: none;
        }

        .exp1s5-user-info {
            display: flex;
            flex-direction: column;
            position: relative;
        }

        .exp1s5-user-name {
            font-weight: 600;
            font-size: 1.1rem;
            color: white;
            margin-bottom: 0.2rem;
            transition: all 0.3s ease;
        }

        /* User Dropdown */
        .exp1s5-user-dropdown {
            position: absolute;
            top: 100%;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px);
            border-radius: 12px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.2);
            min-width: 180px;
            padding: 0.5rem 0;
            margin-top: 0.5rem;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-10px);
            transition: all 0.3s ease;
            z-index: 1001;
        }

        .exp1s5-user-profile:hover .exp1s5-user-dropdown,
        .exp1s5-user-dropdown:hover {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .exp1s5-dropdown-item {
            display: block;
            padding: 0.75rem 1.5rem;
            color: #333;
            text-decoration: none;
            font-weight: 500;
            font-size: 0.9rem;
            transition: all 0.3s ease;
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        }

        .exp1s5-dropdown-item:last-child {
            border-bottom: none;
        }

        .exp1s5-dropdown-item:hover {
            background: rgba(74, 144, 226, 0.1);
            color: #4a90e2;
            transform: translateX(4px);
        }

        .exp1s5-dropdown-item.exp1s5-logout {
            color: #dc3545;
            border-top: 1px solid rgba(0, 0, 0, 0.1);
            margin-top: 0.5rem;
        }

        .exp1s5-dropdown-item.exp1s5-logout:hover {
            background: rgba(220, 53, 69, 0.1);
            color: #dc3545;
        }

        /* Mobile Menu Toggle */
        .exp1s5-mobile-menu-toggle {
            display: none;
            background: #012051;
            border: 2px solid rgba(255, 255, 255, 0.3);
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 0.5rem;
            border-radius: 8px;
            transition: all 0.3s ease;
            width: 50px;
            height: 50px;
            align-items: center;
            justify-content: center;
            z-index: 2001;
        }

        .exp1s5-mobile-menu-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        /* Mobile Navigation Styles */
        @media (max-width: 968px) {
            .exp1s5-mobile-menu-toggle {
                display: flex;
            }

            .exp1s5-main-nav {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                background: rgba(1, 32, 81, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 2rem;
                transition: left 0.3s ease;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
                height: calc(100vh - 80px);
                overflow-y: auto;
            }

            .exp1s5-main-nav.exp1s5-active {
                left: 0;
            }

            .exp1s5-nav-links {
                flex-direction: column;
                width: 100%;
                gap: 0;
            }

            .exp1s5-nav-links li {
                width: 100%;
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            }

            .exp1s5-nav-links a {
                display: block;
                padding: 1rem;
                font-size: 1.1rem;
            }

            .exp1s5-auth-section {
                width: 100%;
                margin-top: 1rem;
                margin-left: 0;
            }

            .exp1s5-auth-buttons {
                flex-direction: column;
                width: 100%;
                margin-left: 0;
            }

            .exp1s5-auth-btn {
                width: 100%;
                text-align: center;
            }

            .exp1s5-user-profile {
                width: 100%;
                margin-left: 0;
                justify-content: center;
            }
        }

        /* ===== HEADER STYLES END ===== */

        .header {
            width: 100%;
            height: auto;
            min-height: 300px;
            position: relative;
            overflow: hidden;
            background: white;
            z-index: 10;
            margin-top:0px;
        }
        
        /* Responsive header heights */
        @media (max-width: 1200px) {
            .header {
                min-height: 250px;
            }
        }
        
        @media (max-width: 968px) {
            .header {
                min-height: 200px;
            }
        }
        
        @media (max-width: 768px) {
            .header {
                min-height: 150px;
            }
        }
        
        @media (max-width: 480px) {
            .header {
                min-height: 100px;
            }
        }
        
        @media (max-width: 360px) {
            .header {
                min-height: 80px;
            }
        }

        .header img {
            width: 100%;
            height: auto;
            display: block;
        }

        /* Main container - no sidebar */
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 60px 20px;
        }

        .section-title {
            font-size: 2.5rem;
            color: #034C85;
            text-align: center;
            margin-bottom: 50px;
            font-weight: 600;
            text-shadow: 0 0 30px rgba(3, 76, 133, 0.3);
            position: relative;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 3px;
            background: linear-gradient(90deg, transparent, #034C85, transparent);
            box-shadow: 0 0 20px #034C85;
        }

        /* Simulator Cards Grid */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }

        .simulator-card {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 32px rgba(3, 76, 133, 0.15);
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            cursor: pointer;
            position: relative;
            border: 1px solid rgba(3, 76, 133, 0.2);
        }

        .simulator-card:hover {
            transform: translateY(-12px) scale(1.02);
            border-color: rgba(3, 76, 133, 0.8);
            box-shadow: 0 12px 40px rgba(3, 76, 133, 0.25);
        }

        .new-badge {
            position: absolute;

            top: 20px;

            right: -50px;

            width: 200px;

            background: linear-gradient(135deg, rgba(204, 0, 0, 0.8) 0%, rgba(255, 51, 51, 0.8) 100%);

            transform: rotate(45deg);

            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);

            text-align: center;

            z-index: 10;

            padding: 8px 0;

            color: white;

            font-weight: bold;

            font-size: 14px;

            text-transform: uppercase;

            letter-spacing: 2px;

            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.4);
        }

        

        .card-topic {
            background: transparent;
            padding: 12px 12px 6px 12px;
            text-align: left;
            position: relative;
            z-index: 2;
        }

        .card-topic h3 {
            font-size: 1.3rem;
            color: #034C85;
            margin-bottom: 0;
            font-weight: 600;
            text-shadow: 0 2px 10px rgba(3, 76, 133, 0.2);
        }

        .card-badge {
            display: inline-flex;
            align-items: center;
            background: linear-gradient(135deg, rgba(255, 193, 7, 0.15), rgba(255, 193, 7, 0.1));
            color: #f39c12;
            padding: 5px 14px;
            border-radius: 20px;
            font-size: 0.95rem;
            margin-top: 6px;
            font-weight: 600;
            border: 1px solid rgba(255, 193, 7, 0.3);
            box-shadow: 0 0 15px rgba(255, 193, 7, 0.1);
        }

        .card-badge::before {
            content: '⭐';
            margin-right: 6px;
            animation: rotate 3s linear infinite;
        }

        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .card-image {
            width: 100%;
            height: 180px;
            background: transparent;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
            padding: 10px;
            z-index: 2;
        }

        .card-image::before {
            content: '';
            position: absolute;
            width: 150%;
            height: 150%;
            background: radial-gradient(circle, rgba(3, 76, 133, 0.03) 0%, transparent 70%);
            animation: rotateBg 20s linear infinite;
        }

        @keyframes rotateBg {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .card-image img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            position: relative;
            z-index: 2;
            transition: transform 0.4s ease;
        }

        .simulator-card:hover .card-image img {
            transform: scale(1.1);
        }

        .card-placeholder {
            font-size: 4rem;
            position: relative;
            z-index: 2;
            filter: drop-shadow(0 0 20px rgba(3, 76, 133, 0.8));
            animation: float 3s ease-in-out infinite;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-10px); }
        }

        .card-title-section {
            background: transparent;
            padding: 6px 12px;
            text-align: left;
            position: relative;
            z-index: 2;
        }

        .card-title {
            font-size: 1.15rem;
            color: #2c3e50;
            font-weight: 600;
            margin: 0 0 8px 0;
        }

        .card-description {
            font-size: 0.9rem;
            color: #666;
            line-height: 1.4;
            margin: 0;
        }

        .card-footer {
            padding: 10px 12px 12px 12px;
            background: transparent;
            position: relative;
            z-index: 2;
        }

        .card-buttons {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .card-footer button {
            width: 100%;
            padding: 10px;
            background: linear-gradient(135deg, #034C85, #0568a8);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 0.85rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            position: relative;
            overflow: hidden;
            border: 1px solid rgba(3, 76, 133, 0.5);
            box-shadow: 0 4px 15px rgba(3, 76, 133, 0.3);
        }

        .card-footer button::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.2);
            transform: translate(-50%, -50%);
            transition: width 0.6s, height 0.6s;
        }

        .card-footer button:hover::after {
            width: 300px;
            height: 300px;
        }

        .card-footer button:hover {
            background: linear-gradient(135deg, #0568a8, #06a8ff);
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(3, 76, 133, 0.6);
            border-color: #06a8ff;
        }

        .card-footer button.secondary {
            background: linear-gradient(135deg, rgba(3, 76, 133, 0.4), rgba(3, 76, 133, 0.6));
            box-shadow: 0 4px 15px rgba(3, 76, 133, 0.2);
        }

        .card-footer button.secondary:hover {
            background: linear-gradient(135deg, rgba(3, 76, 133, 0.6), rgba(3, 76, 133, 0.8));
            box-shadow: 0 8px 25px rgba(3, 76, 133, 0.4);
        }

        .card-footer button.graph::before {
            content: '📊';
        }

        .card-footer button.principle::before {
            content: '📖';
        }

        /* Filter buttons for Topics/Units */
        .filter-container {
            margin-bottom: 30px;
            text-align: center;
        }

        .filter-buttons {
            display: inline-flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            padding: 20px;
            background: rgba(3, 76, 133, 0.05);
            border-radius: 10px;
        }

        .filter-btn {
            padding: 8px 20px;
            background: white;
            border: 2px solid #034C85;
            color: #034C85;
            border-radius: 25px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
            font-size: 0.9rem;
        }

        .filter-btn:hover {
            background: #034C85;
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(3, 76, 133, 0.3);
        }

        .filter-btn.active {
            background: #034C85;
            color: white;
        }

        .loading {
            text-align: center;
            padding: 40px;
            font-size: 1.2rem;
            color: #034C85;
            text-shadow: 0 0 20px rgba(3, 76, 133, 0.3);
        }

        .error {
            text-align: center;
            padding: 40px;
            font-size: 1.2rem;
            color: #ff6b6b;
            text-shadow: 0 0 20px rgba(255, 68, 68, 0.3);
        }

        /* Login Popup Modal */
        .login-popup-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.7);
            backdrop-filter: blur(5px);
            z-index: 1000;
            justify-content: center;
            align-items: center;
        }

        .login-popup-overlay.active {
            display: flex;
        }

        .login-popup {
            background: white;
            padding: 40px;
            border-radius: 15px;
            box-shadow: 0 10px 50px rgba(0, 0, 0, 0.3);
            max-width: 450px;
            width: 90%;
            text-align: center;
            position: relative;
            animation: popupSlideIn 0.3s ease-out;
        }

        @keyframes popupSlideIn {
            from {
                transform: translateY(-50px);
                opacity: 0;
            }
            to {
                transform: translateY(0);
                opacity: 1;
            }
        }

        .login-popup-close {
            position: absolute;
            top: 15px;
            right: 15px;
            font-size: 1.5rem;
            color: #666;
            cursor: pointer;
            background: none;
            border: none;
            width: 30px;
            height: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            transition: all 0.3s ease;
        }

        .login-popup-close:hover {
            background: rgba(0, 0, 0, 0.1);
            color: #333;
        }

        .login-popup-icon {
            font-size: 3rem;
            margin-bottom: 20px;
        }

        .login-popup h2 {
            color: #034C85;
            font-size: 1.8rem;
            margin-bottom: 15px;
        }

        .login-popup p {
            color: #666;
            font-size: 1.1rem;
            margin-bottom: 30px;
            line-height: 1.6;
        }

        .login-popup-buttons {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .login-popup-button {
            padding: 15px 30px;
            font-size: 1rem;
            font-weight: 600;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
        }

        .login-popup-button.primary {
            background: linear-gradient(135deg, #034C85, #0568a8);
            color: white;
            box-shadow: 0 4px 15px rgba(3, 76, 133, 0.3);
        }

        .login-popup-button.primary:hover {
            background: linear-gradient(135deg, #0568a8, #06a8ff);
            box-shadow: 0 6px 20px rgba(3, 76, 133, 0.5);
            transform: translateY(-2px);
        }

        .login-popup-button.google {
            background: white;
            color: #333;
            border: 2px solid #ddd;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        .login-popup-button.google:hover {
            background: #f8f9fa;
            border-color: #ccc;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
            transform: translateY(-2px);
        }

        .login-popup-button.secondary {
            background: transparent;
            color: #034C85;
            border: 2px solid #034C85;
        }

        .login-popup-button.secondary:hover {
            background: rgba(3, 76, 133, 0.1);
        }

        /* Container for the embedded form */
        #simulator-ideas-footer {
            width: 100%;
            max-width: 100%;
            margin-top: 40px;
            border-radius: 0 !important;
            box-sizing: border-box;
        }

        @media (max-width: 768px) {
            

            .section-title {
                font-size: 1.8rem;
                margin-bottom: 30px;
            }

            .cards-grid {
                grid-template-columns: 1fr;
                gap: 25px;
            }

            .container {
                padding: 40px 15px;
            }

            .filter-buttons {
                padding: 15px;
            }

            .filter-btn {
                font-size: 0.85rem;
                padding: 6px 15px;
            }
        }