:root {
    --stone-grey: #78909C;
    --arch-blue: #0D47A1;
    --wood-brown: #8D6E63;
    --safety-yellow: #FDD835;
    --dark-bg: #263238;
    --light-bg: #F5F7F8;
    --text-main: #37474F;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-main);
    background-color: var(--light-bg);
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--arch-blue);
}

.navbar {
    background-color: white;
    border-bottom: 4px solid var(--arch-blue);
    padding: 1rem 2rem;
}

.navbar-brand {
    font-weight: 900;
    font-size: 1.5rem;
    color: var(--arch-blue) !important;
}

.nav-link {
    font-weight: 600;
    color: var(--stone-grey) !important;
    margin: 0 10px;
    transition: color 0.3s;
}

.nav-link:hover, .nav-link.active {
    color: var(--arch-blue) !important;
}

.btn-primary {
    background-color: var(--arch-blue);
    border-color: var(--arch-blue);
    border-radius: 0;
    padding: 10px 25px;
    font-weight: 600;
}

.btn-primary:hover {
    background-color: #0a3a82;
    border-color: #0a3a82;
}

.section-title {
    position: relative;
    padding-bottom: 15px;
    margin-bottom: 30px;
}

.section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 60px;
    height: 4px;
    background-color: var(--safety-yellow);
}

footer {
    background-color: var(--dark-bg);
    color: white;
    padding: 60px 0 30px;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: white;
    margin-bottom: 20px;
}

.footer-link {
    color: #CFD8DC;
    text-decoration: none;
    display: block;
    margin-bottom: 10px;
}

.footer-link:hover {
    color: var(--safety-yellow);
}

/* Material Texture Overlays */
.texture-concrete {
    background-color: var(--stone-grey);
    background-image: url('https://www.transparenttextures.com/patterns/concrete-wall.png');
}

.texture-wood {
    background-color: var(--wood-brown);
    background-image: url('https://www.transparenttextures.com/patterns/wood-pattern.png');
}

.card {
    border-radius: 0;
    border: 1px solid #e0e0e0;
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}