/* Enhanced Strand Selection */
    .choose-header {
        background: linear-gradient(135deg, var(--theme-green), #059669);
        color: white;
        padding: 2rem;
        border-radius: 20px;
        text-align: center;
        margin-bottom: 2.5rem;
        box-shadow: 0 10px 40px rgba(1, 87, 38, 0.2);
        animation: fadeInDown 0.6s ease-out;
    }

    .choose-header h2 {
        font-size: 1.8rem;
        font-weight: 800;
        margin-bottom: 0.5rem;
        color: white;
    }

    .choose-header p {
        margin-bottom: 0;
        opacity: 0.95;
        font-size: 0.95rem;
        color: white;
    }

    /* Strand Cards - Compact & Modern */
    .strand-card {
    background: white; /* Changed from rgba(255, 255, 255, 0.95) to solid white */
    border-radius: 20px;
    padding: 2rem 1.5rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    border: 2px solid rgba(1, 87, 38, 0.1);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    text-align: center;
    height: 100%;
    z-index: 10; /* Add this */
}


    .strand-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(90deg, #015726, #059669, #10b981);
        transform: scaleX(0);
        transition: transform 0.4s ease;
    }

    .strand-card:hover {
        transform: translateY(-8px) scale(1.02);
        box-shadow: 0 15px 45px rgba(1, 87, 38, 0.15);
        border-color: var(--theme-green);
        background: white;
    }

    .strand-card:hover::before {
        transform: scaleX(1);
    }

    .strand-emoji {
        font-size: 2.5rem;
        margin-bottom: 0.75rem;
        display: block;
        transition: transform 0.3s ease;
    }

    .strand-card:hover .strand-emoji {
        transform: scale(1.2) rotate(5deg);
    }

    .strand-card h2 {
        font-size: 1.75rem;
        font-weight: 800;
        color: var(--theme-green);
        margin-bottom: 0.5rem;
        transition: color 0.3s ease;
    }

    .strand-card:hover h2 {
        color: #059669;
    }

    .strand-card small {
        color: #64748b;
        font-size: 0.85rem;
        font-weight: 500;
        display: block;
    }

    /* Research Design Selection */
    .design-selection {
        display: none;
        animation: fadeInUp 0.5s ease-out;
        margin-bottom: 3rem;
    }

    .design-selection.active {
        display: block;
    }

    .design-header {
        text-align: center;
        margin-bottom: 2rem;
    }

    .design-header h3 {
        font-size: 1.8rem;
        font-weight: 700;
        color: var(--theme-green);
        margin-bottom: 0.5rem;
    }

    .design-header p {
        color: #64748b;
        font-size: 0.95rem;
    }

    .back-to-strands {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        padding: 0.6rem 1.2rem;
        background: white;
        border: 2px solid var(--theme-green);
        color: var(--theme-green);
        border-radius: 50px;
        font-weight: 600;
        font-size: 0.9rem;
        cursor: pointer;
        transition: all 0.3s ease;
        margin-bottom: 1.5rem;
    }

    .back-to-strands:hover {
        background: var(--theme-green);
        color: white;
        transform: translateX(-5px);
    }

    .design-card {
    background: white; /* Changed from rgba(255, 255, 255, 0.95) to solid white */
    border-radius: 16px;
    padding: 1.5rem;
    border: 2px solid rgba(1, 87, 38, 0.15);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    cursor: pointer;
    position: relative;
    height: 100%;
    display: flex;
    flex-direction: column;
    z-index: 10; /* Add this */
    }

    .design-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 12px 35px rgba(1, 87, 38, 0.2);
        border-color: var(--theme-green);
    }

    .design-icon {
        width: 50px;
        height: 50px;
        background: linear-gradient(135deg, var(--theme-green), #059669);
        border-radius: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        font-size: 1.5rem;
        margin-bottom: 1rem;
        transition: transform 0.3s ease;
    }

    .design-card:hover .design-icon {
        transform: rotate(10deg) scale(1.1);
    }

    .design-card h5 {
        font-size: 1.2rem;
        font-weight: 700;
        color: var(--theme-green);
        margin-bottom: 0.5rem;
    }

    .design-card p {
        font-size: 0.85rem;
        color: #64748b;
        line-height: 1.5;
        margin-bottom: 0;
        flex-grow: 1;
    }

    /* Back Button */
    .back-btn {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        padding: 0.7rem 1.5rem;
        background: white;
        border: 2px solid var(--theme-green);
        color: var(--theme-green);
        border-radius: 50px;
        font-weight: 600;
        cursor: pointer;
        transition: all 0.3s ease;
        font-size: 0.95rem;
    }

    .back-btn:hover {
        background: var(--theme-green);
        color: white;
        transform: translateX(-5px);
    }

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

    /* Ensure proper z-index layering */
    .section-header {
        position: relative;
        z-index: 10;
    }

    .paper-wrapper {
        position: relative;
        z-index: 10;
    }

    /* Responsive adjustments for strand/design cards */
    @media (max-width: 992px) {
        .choose-header {
            padding: 1.5rem;
            border-radius: 16px;
        }

        .choose-header h2 {
            font-size: 1.6rem;
        }

        .strand-card {
            margin-bottom: 1rem;
        }

        .design-card {
            margin-bottom: 1rem;
        }
    }

    @media (max-width: 768px) {
        .choose-header {
            padding: 1.25rem;
            margin-bottom: 2rem;
        }

        .choose-header h2 {
            font-size: 1.4rem;
        }

        .choose-header p {
            font-size: 0.85rem;
        }

        .strand-card {
            padding: 1.5rem 1rem;
            overflow: visible !important;
        }

        .strand-card h2 {
            font-size: 1.4rem;
        }

        .strand-emoji {
            font-size: 2rem;
        }

        .design-header h3 {
            font-size: 1.5rem;
        }

        .design-card {
            padding: 1.25rem;
        }

        .design-card h5 {
            font-size: 1.1rem;
        }

        .back-btn,
        .back-to-strands {
            padding: 0.6rem 1.2rem;
            font-size: 0.85rem;
        }
    }

    @media (max-width: 576px) {
        .choose-header {
            padding: 1rem;
            border-radius: 12px;
        }

        .choose-header h2 {
            font-size: 1.25rem;
        }

        .strand-card {
            padding: 1.25rem 0.75rem;
        }

        .strand-card h2 {
            font-size: 1.25rem;
        }

        .strand-card small {
            font-size: 0.8rem;
        }

        .strand-emoji {
            font-size: 1.75rem;
        }

        .design-header h3 {
            font-size: 1.3rem;
        }

        .design-card {
            padding: 1rem;
        }

        .design-icon {
            width: 40px;
            height: 40px;
            font-size: 1.25rem;
        }

        .design-card h5 {
            font-size: 1rem;
        }

        .design-card p {
            font-size: 0.8rem;
        }

        .back-btn,
        .back-to-strands {
            padding: 0.5rem 1rem;
            font-size: 0.8rem;
        }
    }

    @media (max-width: 400px) {
        .choose-header h2 {
            font-size: 1.1rem;
        }

        .strand-card h2 {
            font-size: 1.1rem;
        }
    }