/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --primary-light: #64B5F6;
    --secondary-color: #0D47A1;
    --accent-color: #00BCD4;
    --text-color: #333333;
    --text-light: #666666;
    --text-lighter: #999999;
    --white: #ffffff;
    --black: #000000;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.2);
    --transition: all 0.3s ease;
    --border-radius: 12px;
    --border-radius-sm: 8px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 0.5em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.3rem, 3vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

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

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

ul {
    list-style: none;
}

/* ===================================
   Container & Layout
   =================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

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

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

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

.btn-outline:hover {
    background: var(--white);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--primary-color);
    border-color: var(--gray-200);
    padding: 10px 20px;
    font-size: 0.9rem;
}

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

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 15px 0;
    background: rgba(13, 71, 161, 0.95);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.logo img {
    height: 50px;
    width: auto;
}

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-weight: 500;
    color: var(--white);
    position: relative;
    padding: 5px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--white);
    transition: var(--transition);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    display: block;
    width: 28px;
    height: 2px;
    background: var(--white);
    transition: var(--transition);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    background-image: url('../img/header-bg.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(13, 71, 161, 0.85) 0%, rgba(33, 150, 243, 0.75) 100%);
}

.hero-content {
    position: relative;
    text-align: center;
    color: var(--white);
    padding: 20px;
    max-width: 800px;
}

.hero h1 {
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: clamp(1.2rem, 3vw, 1.5rem);
    color: rgba(255,255,255,0.9);
    margin-bottom: 40px;
    font-weight: 300;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.hero-scroll a {
    color: var(--white);
    font-size: 2rem;
    opacity: 0.8;
}

.hero-scroll a:hover {
    opacity: 1;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

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

.section-header h2 {
    color: var(--text-color);
    margin-bottom: 15px;
}

.section-header p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.section-header.light h2 {
    color: var(--white);
}

.section-header.light p {
    color: rgba(255,255,255,0.8);
}

/* ===================================
   Services Section
   =================================== */
.services {
    padding: 100px 0;
    background: var(--white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--gray-200);
}

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

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    border-radius: 50%;
    font-size: 2rem;
    color: var(--white);
}

.service-card h3 {
    color: var(--text-color);
    margin-bottom: 15px;
}

.service-card p {
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* ===================================
   Equipment Section
   =================================== */
.equipment {
    padding: 100px 0;
    background: var(--gray-100);
}

.equipment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.equipment-card {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.equipment-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.equipment-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.equipment-info {
    padding: 25px;
}

.equipment-info h4 {
    color: var(--text-color);
    margin-bottom: 8px;
}

.equipment-info p {
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* ===================================
   Locations Section
   =================================== */
.locations {
    padding: 100px 0;
    background: var(--white);
}

.locations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
}

.location-card {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.location-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.location-image img {
    width: 100%;
    height: 280px;
    object-fit: cover;
}

.location-info {
    padding: 30px;
}

.location-info h3 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 15px;
}

.location-address {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 20px;
}

.location-address i {
    color: var(--primary-color);
    margin-top: 4px;
}

/* ===================================
   Contact Section
   =================================== */
.contact {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
}

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

.contact-card {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    padding: 40px 30px;
    border-radius: var(--border-radius);
    text-align: center;
    color: var(--white);
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.2);
}

.contact-card:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-5px);
}

.contact-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    font-size: 1.5rem;
}

.contact-card h4 {
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.contact-card p {
    color: rgba(255,255,255,0.85);
    margin-bottom: 0;
    line-height: 1.8;
}

.contact-link {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--white);
}

.contact-link:hover {
    text-decoration: underline;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: #0a1628;
    padding: 60px 0 30px;
    color: var(--white);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    height: 50px;
    margin-bottom: 20px;
}

.footer-brand p {
    color: rgba(255,255,255,0.6);
    font-size: 0.95rem;
}

.footer-links h5,
.footer-contact h5 {
    color: var(--white);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: rgba(255,255,255,0.6);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-light);
}

.footer-contact p {
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 12px;
}

.footer-contact i {
    color: var(--primary-light);
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255,255,255,0.4);
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    z-index: 999;
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 992px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }

    .footer-brand {
        grid-column: span 2;
    }

    .locations-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 80px 40px;
        gap: 30px;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-link {
        color: var(--text-color);
        font-size: 1.1rem;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .hero {
        background-attachment: scroll;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .services {
        padding: 60px 0;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .equipment {
        padding: 60px 0;
    }

    .equipment-grid {
        grid-template-columns: 1fr;
    }

    .locations {
        padding: 60px 0;
    }

    .contact {
        padding: 60px 0;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-brand {
        grid-column: auto;
    }

    .footer-contact p {
        justify-content: center;
    }

    .section-header {
        margin-bottom: 40px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .btn {
        padding: 12px 24px;
        width: 100%;
    }

    .service-card {
        padding: 30px 20px;
    }

    .contact-card {
        padding: 30px 20px;
    }

    .location-info {
        padding: 20px;
    }

    .back-to-top {
        right: 20px;
        bottom: 20px;
        width: 45px;
        height: 45px;
    }
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

/* Smooth scroll offset for fixed navbar */
section[id] {
    scroll-margin-top: 80px;
}