:root {
    --primary-color: #FF6B35; /* Vibrant Orange Construction */
    --primary-hover: #e55a2b;
    --secondary-color: #2c3e50; /* Dark Blue/Gray */
    --accent-color: #2ECC71; /* Mint/Green for success/nature vibe */
    --light-bg: #f8f9fa;
    --dark-text: #212529;
    --light-text: #ffffff;
    --font-heading: 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;
}

body {
    font-family: var(--font-body);
    color: var(--dark-text);
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
}

/* Navbar */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    color: var(--primary-color) !important;
    font-size: 1.5rem;
}

.nav-link {
    color: var(--dark-text) !important;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color) !important;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('../img/facade1.png');
    background-size: cover;
    background-position: center;
    height: 90vh;
    margin-top: 56px; /* Offset for fixed navbar */
}

/* Constants & Utilities */
.text-primary {
    color: var(--primary-color) !important;
}

.bg-primary {
    background-color: var(--primary-color) !important;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Feature Cards */
.feature-card {
    background: white;
    border-radius: 12px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(0,0,0,0.05);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}

/* Models Section */
.card-img-top {
    height: 250px;
    object-fit: cover;
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
}

.card {
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-3px);
}

/* FAQ Accordion */
.faq-question {
    font-size: 1.1rem;
}
.faq-question:hover {
    color: var(--primary-color) !important;
}

/* Footer */
footer a:hover {
    opacity: 0.8;
}

/* Range Input Styling */
input[type=range]::-webkit-slider-thumb {
    background: var(--primary-color);
}

input[type=range]::-moz-range-thumb {
    background: var(--primary-color);
}