:root {
            --blue-500: #3b82f6;
            --blue-600: #2563eb;
            --gray-50: #f9fafb;
            --gray-100: #f3f4f6;
            --gray-600: #4b5563;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --white: #ffffff;
        }

        body {
            font-family: 'Inter', sans-serif;
            scroll-behavior: smooth;
            margin: 0;
            background-color: var(--gray-50);
            color: var(--gray-800);
            line-height: 1.6;
        }

        /* Container for centered content */
        .container {
            width: 100%;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }
        @media (max-width: 539px) {
  .container {
    max-width: 90%;
    padding-left: 0;
    padding-right: 0;
  }
}
        @media (min-width: 640px) { .container { max-width: 100%; padding-left: 0;
            padding-right: 0; } }
        @media (min-width: 768px) { .container { max-width: 100%; } }
        @media (min-width: 1024px) { .container { max-width: 1024px; } }
        @media (min-width: 1280px) { .container { max-width: 1280px; } }

        /* Header and Navigation */
        .header {
            background-color: var(--white);
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
            position: sticky;
            top: 0;
            z-index: 50;
            width: 100%;
        }
        .nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.75rem 0;
        }
        .nav-logo-link {
            display: flex;
            align-items: center;
            text-decoration: none;
            color: var(--gray-700);
        }
        .nav-logo { height: 3rem; margin-right: 0.75rem; }
        .nav-title { font-weight: 700; font-size: 1.25rem; }
        .nav-links { display: none; }
        @media (min-width: 768px) { .nav-links { display: flex; gap: 1.5rem; } }
        .nav-link {
            color: var(--gray-600);
            text-decoration: none;
            transition: color 0.3s;
        }
        .nav-link:hover { color: var(--blue-500); }
        .nav-link.active { color: var(--blue-500); font-weight: 600; }
        
        /* Mobile Menu */
        /* This rule makes the button visible on all screens by default (mobile-first approach). */
        .mobile-menu-button { display: block; background: none; border: none; cursor: pointer; padding: 0; margin: 0;   line-height: 0;
  font-size: 0;}
        /* This media query hides the button when the screen is 768px or wider. */
        @media (min-width: 768px) { .mobile-menu-button { display: none; } }
        .mobile-menu { display: none; background-color: var(--white); border-top: 1px solid var(--gray-100); }
        .mobile-menu.active { display: block; } /* Add this class for toggling */
        .mobile-menu a { display: block; padding: 0.5rem 1rem; text-decoration: none; color: var(--gray-600); }
        .mobile-menu a:hover { background-color: var(--gray-100); }

        /* Hero Section */
        .hero-section {
            background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('https://placehold.co/1920x1080/cccccc/000000?text=Construction+Site');
            background-size: cover;
            background-position: center;
            color: var(--white);
            height: 60vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
        }
        @media (min-width: 768px) { .hero-section { height: 80vh; } }
        .hero-section h1 { font-size: 1.875rem; font-weight: 700; margin-bottom: 1rem; }
        @media (min-width: 768px) { .hero-section h1 { font-size: 3rem; } }
        .hero-section p { font-size: 1.125rem; margin-bottom: 2rem; max-width: 48rem; margin-left: auto; margin-right: auto; }
        .hero-button {
            background-color: var(--blue-500);
            color: var(--white);
            font-weight: 700;
            padding: 0.75rem 2rem;
            border-radius: 9999px;
            text-decoration: none;
            transition: background-color 0.3s, transform 0.3s;
        }
        .hero-button:hover { background-color: var(--blue-600); transform: scale(1.05); }

        /* General Section Styling */
        .section { padding: 4rem 0; }
        @media (min-width: 768px) { .section { padding: 6rem 0; } }
        .section-white { background-color: var(--white); }
        .section-title {
            font-size: 1.875rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
            padding-bottom: 0.5rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--blue-500);
            border-radius: 2px;
        }

        /* Grid Layouts */
        .grid { display: grid; gap: 2rem; }
        @media (min-width: 768px) { .grid-md-2 { grid-template-columns: repeat(2, 1fr); } }
        @media (min-width: 1024px) { .grid-lg-3 { grid-template-columns: repeat(3, 1fr); } }

        /* Card Styles */
        .card {
            background-color: var(--white);
            padding: 2rem;
            border-radius: 0.5rem;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
            transition: box-shadow 0.3s;
            text-align: center;
        }
        .card:hover { box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05); }
        .card h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 0.5rem; }
        .card p { color: var(--gray-600); }
        .card .icon { color: var(--blue-500); margin-bottom: 1rem; }
        .card .icon svg { width: 3rem; height: 3rem; margin: 0 auto; }

        /* Project Card Styles */
        .project-card {
            background-color: var(--gray-50);
            border-radius: 0.5rem;
            overflow: hidden;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
            transition: box-shadow 0.3s;
        }
        .project-card:hover { box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
        .project-card img { width: 100%; height: 12rem; object-fit: cover; }
        .project-card-content { padding: 1.5rem; }

        /* Contact Form */
        .contact-section {
            background-color: var(--white);
            padding: 2rem;
            border-radius: 0.5rem;
            box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
            max-width: 56rem;
            margin: 0 auto;
        }
        .form-group { margin-bottom: 1rem; }
        .form-label { display: block; font-size: 0.875rem; font-weight: 500; color: var(--gray-700); }
        .form-input, .form-textarea {
            margin-top: 0.25rem;
            display: block;
            width: 100%;
            padding: 0.5rem 0.75rem;
            background-color: var(--white);
            border: 1px solid #d1d5db;
            border-radius: 0.375rem;
            box-shadow: 0 1px 2px 0 rgba(0,0,0,0.05);
        }
        .form-input:focus, .form-textarea:focus {
            outline: none;
            border-color: var(--blue-500);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
        }
        .submit-button {
            width: 100%;
            background-color: var(--blue-500);
            color: var(--white);
            font-weight: 700;
            padding: 0.75rem 1.5rem;
            border: none;
            border-radius: 0.375rem;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        .submit-button:hover { background-color: var(--blue-600); }

        /* Footer */
        .footer { background-color: var(--gray-800); color: var(--white); padding: 3rem 0; text-align: center; }
        .footer-logo { height: 4rem; margin-bottom: 1.5rem; }
        .footer-title { font-size: 1.25rem; font-weight: 600; margin-bottom: 0.5rem; }
        .footer-subtitle { color: #9ca3af; margin-bottom: 1.5rem; }
        .footer-links { display: flex; justify-content: center; gap: 1.5rem; margin-bottom: 1.5rem; }
        .footer-links a { color: var(--white); text-decoration: none; }
        .footer-links a:hover { color: var(--blue-500); }
        .footer-copy { color: #6b7280; font-size: 0.875rem; }

        /* Utility Classes */
        .hidden { display: none; }
        .page-section { display: none; }
        .text-left { text-align: left; }
        .text-center { text-align: center; }
        .items-center { align-items: center; }
        .font-semibold { font-weight: 600; }
        .mb-4 { margin-bottom: 1rem; }
        .mb-8 { margin-bottom: 2rem; }
        .mb-12 { margin-bottom: 3rem; }
        .mb-16 { margin-bottom: 4rem; }
        .space-y-3 > * + * { margin-top: 0.75rem; }
        .space-y-6 > * + * { margin-top: 1.5rem; }