/* ===================================
   CONSTRUCTION WEBSITE MAIN STYLESHEET
   Professional styling for construction company website
   =================================== */

/* CSS Custom Properties (Variables) for consistent theming */
:root {
    /* Color Palette - Professional construction theme */
    --primary-color: #ff6b35;        /* Construction orange - attention-grabbing yet professional */
    --primary-dark: #e55a2b;         /* Darker orange for hover effects */
    --secondary-color: #2c3e50;      /* Dark blue-gray - trustworthy and professional */
    --accent-color: #f39c12;         /* Golden yellow - represents quality and reliability */
    --dark-color: #1a1a1a;           /* Deep charcoal for text */
    --light-color: #ffffff;          /* Pure white for contrast */
    --gray-light: #f8f9fa;           /* Light gray for backgrounds */
    --gray-medium: #6c757d;          /* Medium gray for secondary text */
    --gray-dark: #343a40;            /* Dark gray for borders and dividers */
    --success-color: #28a745;        /* Green for success messages */
    --warning-color: #ffc107;        /* Yellow for warnings */
    --danger-color: #dc3545;         /* Red for errors */

    /* Typography Scale - ensures consistent text sizing throughout the site */
    --font-primary: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Open Sans', Arial, sans-serif;
    --font-size-xs: 0.75rem;         /* 12px - small labels and captions */
    --font-size-sm: 0.875rem;        /* 14px - secondary text */
    --font-size-base: 1rem;          /* 16px - body text (web standard) */
    --font-size-lg: 1.125rem;        /* 18px - large body text */
    --font-size-xl: 1.25rem;         /* 20px - subheadings */
    --font-size-2xl: 1.5rem;         /* 24px - section titles */
    --font-size-3xl: 1.875rem;       /* 30px - page headings */
    --font-size-4xl: 2.25rem;        /* 36px - main titles */

    /* Spacing Scale - provides consistent margins and padding */
    --spacing-xs: 0.5rem;            /* 8px - tight spacing */
    --spacing-sm: 0.75rem;           /* 12px - small spacing */
    --spacing-md: 1rem;              /* 16px - base spacing */
    --spacing-lg: 1.5rem;            /* 24px - medium spacing */
    --spacing-xl: 2rem;              /* 32px - large spacing */
    --spacing-2xl: 3rem;             /* 48px - section spacing */
    --spacing-3xl: 4rem;             /* 64px - major section breaks */

    /* Layout Measurements */
    --container-max-width: 1200px;   /* Maximum width for content containers */
    --header-height: 80px;           /* Height of main navigation header */
    --border-radius: 8px;            /* Consistent rounding for elements */
    --box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1); /* Subtle shadow for depth */
    
    /* Animation/Transition Values */
    --transition-fast: 0.2s ease;    /* Quick interactions like hover effects */
    --transition-normal: 0.3s ease;  /* Standard transitions */
    --transition-slow: 0.5s ease;    /* Slower, more noticeable transitions */
}

/* ===================================
   BASE STYLES & RESET
   Establishes foundation for all elements
   =================================== */

/* Modern CSS reset - removes browser inconsistencies */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box; /* Makes width/height calculations include padding and border */
}

/* Root HTML element setup */
html {
    font-size: 100%;                    /* Base 16px - allows rem units to work properly */
    scroll-behavior: smooth;            /* Smooth scrolling for anchor links */
    line-height: 1.6;                  /* Improves text readability */
}

/* Body element - sets global typography and layout foundation */
body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    color: var(--dark-color);
    background-color: var(--light-color);
    overflow-x: hidden;                 /* Prevents horizontal scroll issues */
}

/* Responsive image handling - prevents images from breaking layouts */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Link styling - removes default underlines and provides consistent hover behavior */
a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-fast);
}

a:hover {
    text-decoration: none;
}

/* List styling - removes default bullets/numbers for navigation and layout lists */
ul, ol {
    list-style: none;
}

/* Container class - centers content and provides consistent max width */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===================================
   TOP BAR STYLES
   Contact information and social links bar
   =================================== */

.top-bar {
    background-color: var(--secondary-color);
    color: var(--light-color);
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-sm);
}

.top-bar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.contact-info span {
    margin-right: var(--spacing-lg);
    display: inline-flex;
    align-items: center;
}

.contact-info i {
    margin-right: var(--spacing-xs);
    color: var(--accent-color);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    color: var(--light-color);
    font-size: var(--font-size-sm);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: var(--transition-fast);
}

.social-links a:hover {
    background-color: var(--primary-color);
    transform: translateY(-2px);
}

/* ===================================
   MAIN HEADER & NAVIGATION
   Primary navigation and branding area
   =================================== */

.main-header {
    background-color: var(--light-color);
    box-shadow: var(--box-shadow);
    position: sticky;                    /* Keeps navigation visible when scrolling */
    top: 0;
    z-index: 1000;                      /* Ensures header stays above other content */
    height: var(--header-height);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.navbar-brand h2 {
    color: var(--secondary-color);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    display: flex;
    align-items: center;
}

.navbar-brand i {
    color: var(--primary-color);
    margin-right: var(--spacing-sm);
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--secondary-color);
    font-weight: 500;
    font-size: var(--font-size-base);
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
}

.nav-link i {
    margin-right: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background-color: rgba(255, 107, 53, 0.1);
}

/* Get Quote Button - Special styling for call-to-action */
.btn-quote {
    background-color: var(--primary-color);
    color: var(--light-color) !important;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(255, 107, 53, 0.3);
}

.btn-quote:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.4);
}

/* Mobile menu toggle - hamburger button for responsive navigation */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.hamburger-line {
    width: 25px;
    height: 3px;
    background-color: var(--secondary-color);
    margin: 3px 0;
    transition: var(--transition-fast);
}

@media (max-width: 768px) {
    body .top-bar {
        display: none !important;
    }
}


/* ===================================
   HERO SECTIONS & BANNERS
   Large header sections for pages
   =================================== */

.hero-section {
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.9), rgba(255, 107, 53, 0.8)),
                url('https://images.unsplash.com/photo-1541976590-713941681591?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--light-color);
    padding: var(--spacing-3xl) 0;
    text-align: center;
    position: relative;
}

.hero-content h1 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-content p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===================================
   BUTTONS & FORM ELEMENTS
   Reusable button and form styling
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
}

.btn i {
    margin-right: var(--spacing-xs);
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--light-color);
    box-shadow: 0 2px 8px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.4);
}

.btn-secondary {
    background-color: transparent;
    color: var(--light-color);
    border: 2px solid var(--light-color);
}

.btn-secondary:hover {
    background-color: var(--light-color);
    color: var(--secondary-color);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--light-color);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--secondary-color);
}

.form-control {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* ===================================
   SECTIONS & CONTENT AREAS
   Main content styling and layouts
   =================================== */

.section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--gray-medium);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Services Grid Layout */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.service-card {
    background: var(--light-color);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid #f0f0f0;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.service-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.service-card h3 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xl);
}

.service-card p {
    color: var(--gray-medium);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.service-price {
    font-weight: 700;
    color: var(--accent-color);
    font-size: var(--font-size-lg);
}

/* Gallery Grid */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.gallery-item {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition-normal);
}

.gallery-item:hover {
    transform: scale(1.03);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.gallery-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.gallery-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.8));
    display: flex;
    align-items: flex-end;
    padding: var(--spacing-lg);
    opacity: 0;
    transition: var(--transition-normal);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-info h4 {
    color: var(--light-color);
    margin-bottom: var(--spacing-xs);
}

.gallery-info p {
    color: var(--light-color);
    font-size: var(--font-size-sm);
}

/* Stats/Features Section */
.stats-section {
    background-color: var(--secondary-color);
    color: var(--light-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--accent-color);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-lg);
    color: var(--light-color);
}

/* About Us Content */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.about-text h2 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-3xl);
}

.about-text p {
    color: var(--gray-medium);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.about-image {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

/* ===================================
   FOOTER STYLES
   Website footer with company info
   =================================== */

.main-footer {
    background-color: var(--secondary-color);
    color: var(--light-color);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3,
.footer-section h4 {
    color: var(--accent-color);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    font-size: var(--font-size-2xl);
}

.footer-section p {
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.contact-item i {
    color: var(--accent-color);
    margin-right: var(--spacing-sm);
    width: 20px;
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: var(--light-color);
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
}

.footer-section ul li a:hover {
    color: var(--accent-color);
    padding-left: var(--spacing-xs);
}

.footer-section ul li i {
    margin-right: var(--spacing-xs);
    font-size: var(--font-size-xs);
}

.hours-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.social-media {
    margin-top: var(--spacing-lg);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition-fast);
}

.social-link.facebook {
    background-color: #3b5998;
}

.social-link.linkedin {
    background-color: #0077b5;
}

.social-link.instagram {
    background-color: #e4405f;
}

.social-link.youtube {
    background-color: #ff0000;
}

.social-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-legal a {
    color: var(--light-color);
    margin: 0 var(--spacing-xs);
    transition: var(--transition-fast);
}

.footer-legal a:hover {
    color: var(--accent-color);
}

@media (max-width: 768px) {
    .footer-logo {
        display: none !important;
    }
    
    .main-footer {
        padding: 2rem 1rem; /* 3rem top-bottom, 1rem sides for better spacing */
    }
}

/* ===================================
   BACK TO TOP BUTTON
   Floating button to scroll to top
   =================================== */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--primary-color);
    color: var(--light-color);
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--box-shadow);
    transition: var(--transition-normal);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
}

/* ===================================
   RESPONSIVE DESIGN
   Mobile and tablet optimizations
   =================================== */

@media (max-width: 768px) {
    /* Mobile Navigation */
    .mobile-menu-toggle {
        display: flex;
    }
    
    .navbar-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--light-color);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--box-shadow);
        gap: var(--spacing-sm);
    }
    
    .navbar-nav.active {
        display: flex;
    }
    
    /* Hero Section */
    .hero-content h1 {
        font-size: var(--font-size-3xl);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    /* Top Bar */
    .top-bar-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .contact-info {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .contact-info span {
        margin-right: 0;
    }
    
    /* Grids */
    .services-grid,
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }
    
    /* Spacing Adjustments */
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    /* Typography adjustments for very small screens */
    .hero-content h1 {
        font-size: var(--font-size-2xl);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
    }
}

/* ===================================
   UTILITY CLASSES
   Helper classes for quick styling
   =================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }
.text-accent { color: var(--accent-color); }
.text-muted { color: var(--gray-medium); }

.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--secondary-color); }
.bg-light { background-color: var(--gray-light); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }

/* Loading and Animation Classes */
.fade-in {
    animation: fadeIn 0.8s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-up {
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}