:root {
    /* Color Palette */
    --primary-color: #002B5B;
    /* Deep Blue - Trust & Stability */
    --primary-dark: #001A38;
    --accent-color: #D4AF37;
    /* Muted Gold - Excellence & Premium */
    --text-dark: #1A1A1A;
    --text-light: #555555;
    --white: #FFFFFF;
    --off-white: #F8F9FA;
    --bg-light: #F4F6F8;

    /* Spacing */
    --section-padding: 80px 0;

    /* Fonts */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Transitions */
    --transition-fast: 0.3s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    color: var(--text-light);
    line-height: 1.6;
    background-color: var(--white);
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--text-dark);
    font-weight: 700;
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-fast);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Typography Utilities */
.text-center {
    text-align: center;
}

.text-primary {
    color: var(--primary-color);
}

.text-accent {
    color: var(--accent-color);
}

.mb-1 {
    margin-bottom: 1rem;
}

.mb-2 {
    margin-bottom: 2rem;
}

.mb-3 {
    margin-bottom: 3rem;
}

/* Section Headers */
.section-header {
    margin-bottom: 60px;
    text-align: center;
}

.section-header .subtext {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition-fast);
}

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

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

.btn-outline {
    border-color: var(--white);
    color: var(--white);
}

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

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: transparent;
    z-index: 1000;
    transition: background-color 0.4s ease, padding 0.4s ease;
    padding: 20px 0;
}

header.scrolled {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 15px 0;
}

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

header.scrolled .nav-link {
    color: var(--text-dark);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--white);
    font-family: var(--font-heading);
}

.logo span {
    font-weight: 400;
    font-size: 0.9rem;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: var(--white);
    font-weight: 500;
    font-size: 1rem;
}

.nav-link:hover {
    color: var(--accent-color);
}

.header-cta {
    background: var(--accent-color);
    color: var(--primary-color);
    padding: 8px 20px;
    border-radius: 4px;
    font-weight: 700;
}

.header-cta:hover {
    background: #c19b2e;
}

.mobile-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--white);
    cursor: pointer;
}

header.scrolled .mobile-toggle {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    height: 100vh;
    min-height: 600px;
    background: linear-gradient(rgba(0, 43, 91, 0.7), rgba(0, 43, 91, 0.6)), url('../images/img_bg_4.jpg') center/cover no-repeat fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    padding-top: 80px;
}

.hero-content {
    max-width: 800px;
    animation: fadeInUp 1s ease-out;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    color: var(--white);
}

.hero .lead {
    font-size: 1.25rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

/* Services */
.services {
    padding: var(--section-padding);
    background-color: var(--bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.service-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    /* Very subtle shadow */
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
    border-bottom: 3px solid transparent;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    border-bottom: 3px solid var(--accent-color);
}

.service-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

/* Featured Projects */
.projects {
    padding: var(--section-padding);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
}

.project-item {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    height: 300px;
}

.project-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 43, 91, 0.85);
    /* Deep Blue Overlay */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
    color: var(--white);
    text-align: center;
    padding: 20px;
}

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

.project-item:hover img {
    transform: scale(1.1);
}

/* Choosing Us */
.why-us {
    padding: var(--section-padding);
    background-color: var(--primary-color);
    color: var(--white);
}

.why-us-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-item h3 {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 10px;
}

/* Contact */
.contact-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--white);
    padding: 15px;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    display: none;
    /* Shown on scroll or mobile via JS maybe */
    z-index: 999;
}

.contact-section {
    padding: var(--section-padding);
    background: var(--off-white);
}

.contact-container {
    display: flex;
    flex-wrap: wrap;
    gap: 50px;
}

.contact-info,
.contact-form-wrapper {
    flex: 1;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: var(--font-body);
}

.contact-form textarea {
    height: 150px;
}

/* Footer */
footer {
    background: var(--primary-dark);
    color: #aaa;
    padding: 60px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    color: var(--white);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--primary-color);
        flex-direction: column;
        padding: 20px;
        text-align: center;
    }

    .nav-menu.active {
        display: flex;
    }

    .mobile-toggle {
        display: block;
    }

    .why-us-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-container {
        flex-direction: column;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}