/* Custom styles */
body {
    font-family: 'Inter', sans-serif;
    background-color: #f8fafc; /* A light grey background for a clean look */
    color: #333;
}
.hero-section {
    position: relative; /* Required for the overlay */
    background-image:
        url(https://i.postimg.cc/NQ3Ypyr8/The-Quietly-Charged-City-of-Tomorrow.jpg);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.8); /* White overlay with 50% opacity */
    z-index: 0; /* Place overlay behind content */
}
.hero-section h1 {
    color: #97C339;
    text-shadow: 0 2px 8px rgba(255, 255, 255, 1);
}
.hero-section p {
    color: #97C339;
    text-shadow: 0 2px 4px rgba(255, 255, 255, 1);
}
.cta-button {
    transition: all 0.3s ease;
}
.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}
.section-title {
    position: relative;
    padding-bottom: 0.5rem;
    font-size: 2.25rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 1rem;
    text-align: center;
}
.section-subtitle {
    font-size: 1.125rem;
    color: #5a6875;
    margin-bottom: 2.5rem;
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}
.nav-link {
    transition: color 0.3s;
}
.nav-link:hover {
    color: #3498db;
}
.tab-button {
    transition: all 0.3s;
}
.tab-button.active {
    background-color: #81A630;
    color: #ffffff;
}
.cluster-card.active {
    border-color: #3498db;
    transform: scale(1.05);
}
.cluster-card {
    border: 2px solid transparent;
}
/*.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: #2dd4bf;  Teal accent 
}*/
.gemini-modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.6);
}
.gemini-modal-content {
    position: relative;
    margin: 10% auto;
    width: 90%;
    max-width: 600px;
}
.loader {
    border: 4px solid #f3f3f3;
    border-radius: 50%;
    border-top: 4px solid #81A630;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}
#calculate-roi-btn {
    display: flex;
    align-items: center;
    justify-content: center;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}