:root {
    --primary-color: #0A2540; /* Deep sophisticated blue */
    --accent-color: #00D084; /* Vibrant renewable green */
    --bg-light: #F7FAFC; /* Very light cool gray */
    --text-main: #2D3748;
    --text-muted: #718096;
    --white: #FFFFFF;
    
    /* Typography */
    --font-sans: 'Inter', system-ui, sans-serif;
    
    /* Shadows */
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.12);
    
    /* Transitions */
    --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    color: var(--text-main);
    background-color: var(--bg-light);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
.fade-in {
    animation: fadeIn 0.8s ease-out forwards;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition-smooth);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.main-nav ul {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    padding-bottom: 4px;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition-smooth);
}

.main-nav a:hover::after, .main-nav a.active::after {
    width: 100%;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-smooth);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: #0d3155;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Hero Section */
.hero-section {
    position: relative;
    padding: 8rem 2rem;
    background-image: linear-gradient(rgba(10, 37, 64, 0.7), rgba(10, 37, 64, 0.8)), url('/static/images/hero-bg.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--white);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.2rem;
    max-width: 600px;
    opacity: 0.9;
    font-weight: 300;
}

/* Industries Section */
.industries-section {
    padding: 6rem 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

/* Modern Card Design */
.industry-card {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    cursor: pointer;
    border: 1px solid rgba(0,0,0,0.03);
}

.industry-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.card-image {
    height: 200px;
    background-size: cover;
    background-position: center;
    transition: var(--transition-smooth);
}

.industry-card:hover .card-image {
    transform: scale(1.05);
}

/* Fix for image scale overflow */
.industry-card {
    position: relative;
    overflow: hidden;
}

.card-content {
    padding: 2rem;
    position: relative;
    background: var(--white);
    z-index: 2;
}

.card-content h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.industry-card:hover .card-content h3::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 30px;
    height: 3px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

.card-content p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Footer */
.site-footer {
    background-color: var(--primary-color);
    color: rgba(255, 255, 255, 0.7);
    padding: 4rem 2rem 2rem;
    margin-top: 4rem;
}

.footer-top {
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 2rem;
    margin-bottom: 2rem;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
    color: var(--white);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    color: var(--white);
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 0.75rem;
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 2rem;
    font-size: 0.85rem;
}

/* AI Chat Box */
.ai-chat-widget {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 1000;
    width: 350px;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: var(--white);
    border: 1px solid rgba(0,0,0,0.1);
}

.chat-header {
    background: linear-gradient(135deg, var(--primary-color), #1a3f66);
    color: var(--white);
    padding: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-body {
    display: flex;
    flex-direction: column;
    height: 400px;
}

.chat-messages {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: #f8fafc;
}

.message {
    padding: 0.75rem 1rem;
    border-radius: 12px;
    max-width: 85%;
    font-size: 0.9rem;
    animation: fadeIn 0.3s ease-out forwards;
}

.ai-message {
    background: var(--white);
    border: 1px solid rgba(0,0,0,0.05);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.user-message {
    background: var(--accent-color);
    color: var(--white);
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.chat-form {
    display: flex;
    padding: 1rem;
    background: var(--white);
    border-top: 1px solid rgba(0,0,0,0.05);
}

.chat-form input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid #e2e8f0;
    border-radius: 20px;
    outline: none;
    font-size: 0.9rem;
    transition: var(--transition-smooth);
}

.chat-form input:focus {
    border-color: var(--accent-color);
}

.chat-form button {
    background: var(--accent-color);
    color: var(--white);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-left: 0.5rem;
    cursor: pointer;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

.chat-form button:hover {
    background: #00b371;
    transform: scale(1.05);
}

/* Dropdown Menu CSS */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: var(--white);
    min-width: 200px;
    box-shadow: var(--shadow-lg);
    z-index: 100;
    border-radius: 8px;
    padding: 0.5rem 0;
    top: 100%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.dropdown-content a {
    color: var(--text-main) !important;
    padding: 10px 16px !important;
    text-decoration: none;
    display: block;
    font-size: 0.9rem;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.dropdown-content a:hover {
    background-color: var(--background-color);
    color: var(--accent-color) !important;
}

.dropdown:hover .dropdown-content {
    display: block;
    opacity: 1;
}

.dropdown:hover > a {
    color: var(--accent-color);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .logo img {
        max-width: 150px;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .dropdown-content {
        position: static;
        box-shadow: none;
        display: none;
        padding-left: 1rem;
        background: rgba(0,0,0,0.02);
    }
    
    .dropdown:hover .dropdown-content {
        display: block;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-section {
        padding: 4rem 1rem;
        min-height: auto;
    }

    .industries-section {
        padding: 3rem 1rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .contact-info {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .ai-chat-widget {
        width: 100%;
        bottom: 0;
        right: 0;
        border-radius: 16px 16px 0 0;
    }
}