body {
    background: #F5F7FA;
    color: #000000;
    font-family: 'Roboto', sans-serif;
    overflow-x: hidden;
}
h1, h2, h3 {
    font-family: 'Inter', sans-serif;
    color: #000000;
}
.navbar {
    background: #FFFFFF;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.nav-link {
    color: #000000;
    transition: color 0.3s ease, transform 0.3s ease;
}
.nav-link:hover {
    color: #87CEEB;
    transform: scale(1.1);
}
.section {
    padding: 3rem 0;
}
.hero {
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, #87CEEB 0%, #F5F7FA 100%);
}
#hero-3d {
    width: 400px;
    height: 400px;
}
.cta-button {
    background: linear-gradient(45deg, #87CEEB, #00B7EB);
    color: #000000;
    font-weight: bold;
    border-radius: 8px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.cta-button:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(135, 206, 235, 0.5);
}
.card {
    background: #FFFFFF;
    border: 2px solid #87CEEB;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}
.card:hover {
    transform: scale(1.03);
}
.tab-button {
    background: #E0E0E0;
    color: #000000;
    border-radius: 8px;
    transition: background 0.3s ease;
}
.tab-button.active, .tab-button:hover {
    background: #87CEEB;
    color: #000000;
}
.tab-content {
    display: none;
}
.tab-content.active {
    display: block;
}
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}
.modal-content {
    background: #FFFFFF;
    border-radius: 12px;
    width: 95%;
    max-width: 900px;
    position: relative;
    overflow-y: auto;
    max-height: 85vh;
}
.modal-header {
    border-bottom: 2px solid #87CEEB;
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 1100;
}
.modal-footer {
    border-top: 2px solid #87CEEB;
    padding: 1rem;
    position: sticky;
    bottom: 0;
    z-index: 1100;
}
.modal-close {
    cursor: pointer;
    color: #87CEEB;
    font-size: 1.5rem;
}
.product-builder {
    background: #FFFFFF;
    border-radius: 12px;
    padding: 1.5rem;
}
.battery-preview-card {
    display: none;
    background: #FFFFFF;
    border: 2px solid #87CEEB;
    border-radius: 12px;
    padding: 1rem;
    margin-top: 1rem;
}
.battery-preview-card.active {
    display: block;
}
#particles-js {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: -1;
}
.lottie-icon {
    width: 40px;
    height: 40px;
}
.chart-container {
    max-width: 100%;
    margin: 1rem auto;
}
.faq-question {
    transition: background 0.3s ease;
}
.faq-question:hover {
    background: #F0F9FF;
}
.faq-answer {
    display: none;
}
.faq-answer.active {
    display: block;
}
img {
    max-width: 100%;
    height: auto;
    object-fit: contain;
}
.image-container {
    position: relative;
    width: 100%;
}
@media (max-width: 768px) {
    .section {
        padding: 2rem 0;
    }
    .hero {
        min-height: 70vh;
    }
    .modal-content {
        width: 90%;
        max-height: 90vh;
    }
    .chart-container {
        max-width: 100%;
    }
    #nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 64px;
        left: 0;
        background: #FFFFFF;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }
    #nav-links.active {
        display: flex;
    }
    .nav-link {
        padding: 1rem;
        text-align: center;
    }
    .image-container {
        height: 12rem;
    }
}