/* --- Variables & Identity --- */
:root {
    --color-primary: #003366; /* Navy Blue */
    --color-primary-dark: #002244;
    --color-accent: #00AEEF; /* Cyan */
    --color-accent-hover: #009ad4;
    --color-text-main: #333333;
    --color-text-light: #666666;
    --color-bg-light: #F9FAFB;
    --color-white: #FFFFFF;
    --color-border: #E5E7EB;
    
    --font-main: 'Roboto', sans-serif;
    
    --shadow-soft: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --container-width: 1200px;
    --header-height: 80px;
    --transition-speed: 0.3s;
}

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

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

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

ul {
    list-style: none;
}

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

/* --- Utilities --- */
.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-speed);
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 174, 239, 0.3);
}

.btn-outline {
    border-color: var(--color-accent);
    color: var(--color-accent);
    padding: 0.5rem 1.25rem; /* Slightly smaller for header */
}

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

.btn-block {
    display: block;
    width: 100%;
}

.section-title {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
    font-weight: 700;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--color-accent);
    margin: 0.5rem auto 0;
}

/* --- Header --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 1px 0 rgba(0,0,0,0.05); /* Subtle border */
    transition: height var(--transition-speed), box-shadow var(--transition-speed);
    display: flex;
    align-items: center;
}

header.scrolled {
    height: 70px;
    box-shadow: var(--shadow-soft);
}

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

.logo img {
    height: 40px; /* Adjust according to generated logo aspect ratio */
}

.nav-desktop ul {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-desktop a {
    color: var(--color-primary);
    font-weight: 500;
}

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

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn .bar {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-primary);
    margin: 5px 0;
    transition: all 0.3s ease;
}

/* Mobile Menu Overlay */
.nav-mobile {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--color-white);
    padding: 1rem 0;
    box-shadow: var(--shadow-soft);
    transform: translateY(-150%);
    transition: transform var(--transition-speed);
    z-index: 999;
    text-align: center;
}

.nav-mobile.active {
    transform: translateY(0);
}

.nav-mobile ul {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.nav-mobile a {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-primary);
    display: block;
    padding: 0.5rem;
}

/* --- Hero Section --- */
#hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    background-image: url('../assets/hero-bg.png');
    background-size: cover;
    background-position: center;
    color: var(--color-white);
    margin-top: 0; /* No margin-top needed if header overlay is desired, else use header height */
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0,51,102,0.9) 0%, rgba(0,34,68,0.7) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

#hero h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

#hero h1 .highlight {
    color: var(--color-accent);
}

#hero p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    color: rgba(255, 255, 255, 0.9);
    max-width: 600px;
}

/* --- Services Section --- */
#services {
    padding: 5rem 0;
    background-color: var(--color-bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background-color: var(--color-white);
    padding: 2.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-soft);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    text-align: center;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.icon-box {
    width: 80px;
    height: 80px;
    background-color: rgba(0, 174, 239, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--color-accent);
}

.service-card h3 {
    margin-bottom: 1rem;
    color: var(--color-primary);
    font-size: 1.25rem;
}

.service-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* --- Contact Section --- */
#contact {
    padding: 5rem 0;
    background-color: var(--color-white);
}

.contact-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 4rem;
    align-items: flex-start;
}

.contact-info {
    flex: 1;
    min-width: 300px;
}

.contact-info h2 {
    font-size: 2.25rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.contact-info p {
    color: var(--color-text-light);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.info-list li {
    margin-bottom: 1rem;
    font-size: 1.05rem;
    color: var(--color-text-main);
}

.info-list strong {
    color: var(--color-primary);
    min-width: 80px;
    display: inline-block;
}

.contact-form {
    flex: 1;
    min-width: 300px;
    background-color: var(--color-bg-light);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-speed);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

/* --- Footer --- */
footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 2rem 0;
    font-size: 0.9rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-right a {
    color: rgba(255,255,255,0.8);
    margin-left: 1.5rem;
}

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

/* --- Animations --- */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive Helpers --- */
@media (max-width: 768px) {
    .nav-desktop {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    #hero h1 {
        font-size: 2.5rem;
    }
    
    .contact-wrapper {
        flex-direction: column;
        gap: 2rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-right a {
        margin: 0 0.75rem;
    }
}