/* =========================================
   DESIGN SYSTEM & TOKENS
   ========================================= */

:root {
    /* Colors - Kimley-Horn Inspired Palette */
    --color-primary: #af2325;
    /* Deep Burgundy/Red */
    --color-primary-dark: #8c1c1e;
    /* Darker Burgundy */
    --color-primary-light: #d13032;
    /* Lighter Red */
    --color-secondary: #004c7a;
    /* Secondary Corporate Blue */
    --color-gray-900: #1a1a1a;
    /* Charcoal */
    --color-gray-800: #333333;
    /* Dark Gray */
    --color-gray-600: #666666;
    --color-gray-300: #e0e0e0;
    --color-gray-100: #f7f9fa;
    /* Very Light Gray/Off White */
    --color-white: #ffffff;

    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;

    /* Spacing */
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-xxl: 6rem;

    /* Transitions & Shadows */
    --transition-fast: 0.2s ease-in-out;
    --transition-normal: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.12);

    /* Layout */
    --container-max-width: 1280px;
    --border-radius: 8px;
    --border-radius-lg: 16px;
}

/* =========================================
   RESET & GLOBAL STYLES
   ========================================= */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--color-gray-800);
    line-height: 1.6;
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--space-xxl) 0;
}

.bg-light {
    background-color: var(--color-gray-100);
}

/* Typography Styles */
h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--color-gray-900);
    line-height: 1.2;
    font-weight: 700;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
}

.btn-secondary:hover {
    background-color: var(--color-white);
    color: var(--color-gray-900);
    transform: translateY(-2px);
}

/* =========================================
   NAVIGATION BAR
   ========================================= */

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-300);
    transition: var(--transition-normal);
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--color-gray-900);
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-gray-600);
    transition: var(--transition-fast);
    position: relative;
    padding-bottom: 4px;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--color-primary);
    transition: var(--transition-normal);
}

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    display: none;
    flex-direction: column;
    gap: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background-color: var(--color-gray-900);
    transition: var(--transition-fast);
}

@media (max-width: 992px) {
    .nav-links {
        display: none;
        /* Add JS toggle for mobile */
    }

    .mobile-menu-btn {
        display: flex;
    }
}

/* =========================================
   HERO SECTION
   ========================================= */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    /* Offset for navbar */
    overflow: hidden;
}

/* Animated Hero Background (Building / Energy Theme) */
.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    /* A dynamic gradient simulating energy, electrical flow, and structural themes */
    background: repeating-linear-gradient(45deg,
            #1a1a2e 0%,
            #1a1a2e 5%,
            #151525 5%,
            #151525 10%,
            var(--color-primary-dark) 10%,
            var(--color-primary-dark) 11%,
            #1a1a2e 11%,
            #1a1a2e 15%);
    z-index: -2;
    animation: flowBackground 40s linear infinite;
    opacity: 0.85;
}

@keyframes flowBackground {
    0% {
        transform: translate(0, 0);
    }

    100% {
        transform: translate(-50%, -50%);
    }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, rgba(0, 0, 0, 0.8) 0%, rgba(0, 0, 0, 0.4) 100%);
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    padding: 0 var(--space-lg);
    margin: 0 auto;
    width: 100%;
    max-width: var(--container-max-width);
    color: var(--color-white);
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: rgba(255, 255, 255, 0.1);
    border-left: 3px solid var(--color-primary);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: var(--space-lg);
    backdrop-filter: blur(5px);
}

.hero-title {
    font-size: clamp(2.2rem, 8vw, 4.5rem);
    color: var(--color-white);
    margin-bottom: var(--space-md);
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-300);
    margin-bottom: var(--space-xl);
    max-width: 600px;
    font-weight: 300;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
}

@media (max-width: 768px) {
    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

/* =========================================
   SECTION HEADERS
   ========================================= */

.section-header {
    margin-bottom: var(--space-xl);
}

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

.center-align .title-underline {
    margin: var(--space-md) auto;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
}

.title-underline {
    height: 4px;
    width: 60px;
    background-color: var(--color-primary);
    border-radius: 2px;
}

.title-underline.left {
    margin: var(--space-md) 0;
}

.section-description {
    font-size: 1.1rem;
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto;
}

.section-description.left {
    margin: 0;
}

/* =========================================
   MARKETS/CATEGORIES GRID
   ========================================= */

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.category-card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    border: 1px solid var(--color-gray-300);
    display: flex;
    flex-direction: column;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.card-image {
    height: 200px;
    background-color: var(--color-gray-300);
    position: relative;
    overflow: hidden;
    background-size: cover;
    background-position: center;
}

.placeholder-rail {
    background-image: url('images/rail_infrastructure_1772755746566.png');
}

.placeholder-property {
    background-image: url('images/property_development_1772755759811.png');
}

.placeholder-water {
    background-image: url('images/water_engineering_1772755771396.png');
}

.placeholder-cities {
    background-image: url('images/smart_city_1772755788528.png');
}

.placeholder-roads {
    background-image: url('images/modern_highway_1772755801022.png');
}

.placeholder-energy {
    background-image: url('images/renewable_energy_1772755819060.png');
}

.placeholder-maritime {
    background-image: url('images/maritime_coastal_1772755833691.png');
}

.placeholder-aviation {
    background-image: url('images/aviation_airport_1772755845219.png');
}

.card-image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.5), transparent);
}

.card-content {
    padding: var(--space-lg);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-content h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    color: var(--color-gray-900);
}

.card-content p {
    font-size: 0.95rem;
    color: var(--color-gray-600);
    margin-bottom: var(--space-lg);
    flex-grow: 1;
}

.card-link {
    font-weight: 600;
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    font-size: 0.95rem;
}

.card-link .arrow {
    margin-left: 5px;
    transition: var(--transition-fast);
}

.category-card:hover .card-link .arrow {
    transform: translateX(5px);
}

/* =========================================
   SERVICES SECTION (Horizontal layout)
   ========================================= */

.services-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-xl);
    align-items: center;
}

.badge-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: rgba(175, 35, 37, 0.1);
    color: var(--color-primary);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.services-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.service-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
    border-left: 4px solid transparent;
}

.service-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
    border-left-color: var(--color-primary);
}

.service-icon {
    font-size: 2rem;
    background: rgba(175, 35, 37, 0.05);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    color: var(--color-primary);
}

.service-text h4 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.service-text p {
    font-size: 0.9rem;
    color: var(--color-gray-600);
}

@media (max-width: 992px) {
    .services-wrapper {
        grid-template-columns: 1fr;
    }
}

/* =========================================
   FOOTER
   ========================================= */

.footer {
    background-color: var(--color-gray-900);
    color: var(--color-white);
    padding-top: var(--space-xxl);
}

.footer-top {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand h2 {
    color: var(--color-white);
    font-size: 1.8rem;
    margin-bottom: var(--space-sm);
}

.footer-brand span {
    color: var(--color-primary-light);
}

.footer-desc {
    color: var(--color-gray-300);
    max-width: 300px;
    font-size: 0.95rem;
}

.footer-links {
    display: flex;
    gap: var(--space-xl);
    flex-wrap: wrap;
}

.link-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-title {
    color: var(--color-white);
    margin-bottom: var(--space-md);
    font-size: 1.1rem;
}

.link-group a {
    color: var(--color-gray-300);
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.link-group a:hover {
    color: var(--color-primary-light);
    transform: translateX(5px);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) 0;
    color: var(--color-gray-600);
    font-size: 0.9rem;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-legal {
    display: flex;
    gap: var(--space-md);
}

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

/* =========================================
   MOBILE RESPONSIVENESS OVERRIDES
   ========================================= */

.logo-link {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    height: 80px;
    width: 80px;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: var(--transition-fast);
}

@media (max-width: 992px) {
    .nav-container {
        padding: var(--space-sm) var(--space-md);
    }
    .logo-img {
        height: 55px;
        width: 55px;
    }
    .logo a {
        font-size: 1.6rem;
        gap: 8px;
    }
    .hero-title {
        font-size: clamp(2.2rem, 6vw, 3rem);
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .hero {
        padding-top: 60px;
        min-height: 80vh;
    }
}

@media (max-width: 768px) {
    .hero-badge {
        font-size: 0.7rem;
        padding: 0.4rem 0.6rem;
        letter-spacing: 0.5px;
        line-height: 1.4;
    }
    .hero-title {
        font-size: 2.2rem;
        margin-bottom: var(--space-sm);
    }
    .hero-subtitle {
        font-size: 0.95rem;
    }
    .hero-cta {
        flex-direction: column;
        width: 100%;
        gap: var(--space-sm);
    }
    .hero-cta .btn {
        width: 100%;
        text-align: center;
    }
    .section-title {
        font-size: 1.8rem;
    }
    
    .logo-img {
        height: 48px;
        width: 48px;
    }
    .logo-link {
        font-size: 1.4rem;
        gap: 6px;
    }
    .logo a {
        font-size: 1.4rem;
    }
    
    .footer-top {
        flex-direction: column;
        gap: var(--space-lg);
    }
    .footer-links {
        flex-direction: column;
        gap: var(--space-md);
    }
    .categories-grid, .stats-grid, .projects-grid {
        grid-template-columns: 1fr;
    }
}