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

:root {
    --primary-color: #0066ff;
    --secondary-color: #00d4ff;
    --page-bg-base: #f3f4f7;
    --dark-bg: #fafbfc;
    --dark-card: #f3f4f8;
    --text-primary: #12121a;
    --text-secondary: #5c5c70;
    --gradient-1: linear-gradient(135deg, #0066ff 0%, #00d4ff 100%);
    --gradient-2: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --shadow-lg: 0 20px 60px rgba(0, 102, 255, 0.12);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    /* Logo in nav — raise --logo-height / --navbar-offset together if you tweak size */
    /* Shorter nav bar height via logo size — padding kept comfortable (not squeezed) */
    --logo-height: 80px;
    /* Fixed navbar: logo + .nav-wrapper vertical padding — keep hero / mobile menu in sync */
    --navbar-offset: 102px;
    /* Industrial / Lonfu-Tech aligned tokens */
    --color-navy: #162033;
    --color-text: #1b2233;
    --color-muted: #5f6b7a;
    --color-metal-gray: #d8dde3;
    --color-light-gray: #f5f7fa;
    --color-panel: #ffffff;
    --color-soft-blue: #f5f9ff;
    --color-border-blue: #dcebff;
    --color-primary-blue: #007bff;
    --color-cyan: #00b8e6;
    /* Pill chips / badges — screenshot reference #0056b3 on #f5f7fa */
    --tag-blue: #0056b3;
    --tag-blue-rgb: 0, 86, 179;
    --tag-blue-soft: rgba(var(--tag-blue-rgb), 0.08);
    --tag-blue-soft-mid: rgba(var(--tag-blue-rgb), 0.1);
    --tag-blue-border: rgba(var(--tag-blue-rgb), 0.22);
    --tag-blue-border-mid: rgba(var(--tag-blue-rgb), 0.18);
    --tag-blue-text-muted: #004a94;
}

html {
    scroll-behavior: smooth;
    background: var(--page-bg-base);
}

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

/* Industrial studio backdrop: faint grid, blue glow, bearing/shaft silhouettes (German-engineering restraint) */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background-color: #f3f4f7;
    background-image:
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 140 140'%3E%3Cg fill='none' stroke='%23003366' stroke-opacity='0.07' stroke-width='0.55'%3E%3Ccircle cx='70' cy='70' r='62'/%3E%3Ccircle cx='70' cy='70' r='42'/%3E%3Ccircle cx='70' cy='70' r='24'/%3E%3C/g%3E%3C/svg%3E"),
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 220 90'%3E%3Cg fill='none' stroke='%230066ff' stroke-opacity='0.055' stroke-width='1'%3E%3Cline x1='28' y1='45' x2='192' y2='45'/%3E%3Ccircle cx='40' cy='45' r='16'/%3E%3Ccircle cx='180' cy='45' r='16'/%3E%3Crect x='56' y='36' width='108' height='18' rx='2'/%3E%3C/g%3E%3C/svg%3E"),
        radial-gradient(ellipse 110% 48% at 50% -8%, rgba(0, 102, 255, 0.075) 0%, transparent 58%),
        radial-gradient(ellipse 65% 45% at 92% 88%, rgba(0, 180, 210, 0.06) 0%, transparent 52%),
        radial-gradient(ellipse 45% 40% at 8% 55%, rgba(0, 102, 255, 0.045) 0%, transparent 48%),
        linear-gradient(rgba(0, 0, 0, 0.038) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.038) 1px, transparent 1px);
    background-size:
        min(340px, 42vw) auto,
        min(380px, 48vw) auto,
        100% 100%,
        100% 100%,
        100% 100%,
        48px 48px,
        48px 48px;
    background-position:
        calc(100% - 4rem) 3rem,
        2rem calc(100% - 5rem),
        0 0,
        0 0,
        0 0,
        -1px -1px,
        -1px -1px;
    background-repeat: no-repeat, no-repeat, no-repeat, no-repeat, no-repeat, repeat, repeat;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation Bar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.08);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 0;
}

.logo img {
    height: var(--logo-height);
    max-width: min(600px, 90vw);
    width: auto;
    object-fit: contain;
    object-position: left center;
    display: block;
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--text-primary);
}

.logo-accent {
    color: var(--primary-color);
    margin-left: 2px;
}

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

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-1);
    transition: var(--transition);
}

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

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

.nav-cta {
    background: var(--gradient-1);
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
    color: white !important;
}

.nav-cta::after {
    display: none;
}

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

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--navbar-offset);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(0, 102, 255, 0.1) 0%, var(--dark-bg) 70%);
}

.animated-bg {
    position: absolute;
    inset: 0;
    background: 
        linear-gradient(45deg, transparent 30%, rgba(0, 102, 255, 0.05) 50%, transparent 70%),
        radial-gradient(circle at 80% 20%, rgba(0, 212, 255, 0.1) 0%, transparent 50%);
    animation: bgMove 20s ease-in-out infinite;
}

@keyframes bgMove {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(50px, 30px) scale(1.1); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -2px;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

/* Animation Effects */
.fade-in {
    animation: fadeIn 0.8s ease-out;
}

.fade-in-delay {
    animation: fadeIn 0.8s ease-out 0.2s both;
}

.fade-in-delay-2 {
    animation: fadeIn 0.8s ease-out 0.4s both;
}

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

/* Search Box */
.search-box {
    margin-bottom: 3rem;
}

.search-container {
    display: flex;
    max-width: 700px;
    margin: 0 auto;
    background: var(--dark-card);
    border-radius: 60px;
    padding: 0.5rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.search-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 1rem;
    padding: 1rem 1.5rem;
}

.search-input::placeholder {
    color: var(--text-secondary);
}

.search-btn {
    background: var(--gradient-1);
    border: none;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.search-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 30px rgba(0, 102, 255, 0.4);
}

/* Core Services Tags */
.core-services {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
}

.service-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.04);
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.service-badge:hover {
    background: rgba(var(--tag-blue-rgb), 0.1);
    border-color: var(--tag-blue);
    transform: translateY(-2px);
}

.service-badge i {
    color: var(--tag-blue);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.scroll-indicator span {
    width: 2px;
    height: 20px;
    background: var(--primary-color);
    animation: scrollAnim 1.5s ease-in-out infinite;
}

.scroll-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.scroll-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes scrollAnim {
    0%, 100% { opacity: 0.3; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.5); }
}

/* Section Common Styles */
section {
    padding: 8rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* Brand Grid */
.brands-section {
    background: linear-gradient(180deg, var(--dark-bg) 0%, var(--dark-card) 100%);
}

.brands-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.brand-card {
    background: var(--dark-card);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    border: 1px solid rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    cursor: pointer;
}

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

.brand-logo-wrapper {
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    background: rgba(0, 0, 0, 0.03);
    border-radius: 15px;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.brand-info h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.brand-info p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.brand-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.brand-link:hover {
    color: var(--secondary-color);
}

.more-brands {
    text-align: center;
    margin-top: 3rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Service Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.service-card {
    background: var(--dark-card);
    border-radius: 25px;
    padding: 3rem 2.5rem;
    border: 1px solid rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    position: relative;
}

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

.service-card.featured {
    border: 2px solid var(--primary-color);
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1) 0%, var(--dark-card) 100%);
}

.featured-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--tag-blue);
    color: #fff;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.service-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-1);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 2rem;
}

.service-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.service-desc {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.service-list {
    list-style: none;
    margin-bottom: 2rem;
}

.service-list li {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.8rem 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.service-list li:last-child {
    border-bottom: none;
}

.service-list i {
    color: var(--primary-color);
}

.service-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.service-link:hover {
    gap: 1rem;
}

/* Why Us Section */
.why-us-section {
    background: var(--dark-card);
}

.facility-showcase {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 4rem;
}

.facility-image {
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    aspect-ratio: 4/3;
}

.facility-image:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

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

.facility-image:hover img {
    transform: scale(1.1);
}

.facility-image .image-placeholder {
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1) 0%, rgba(0, 212, 255, 0.05) 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.facility-image .image-placeholder i {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    opacity: 0.5;
}

.facility-image .image-placeholder p {
    color: var(--text-secondary);
    text-align: center;
    font-size: 0.95rem;
}

.why-us-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
}

.capability-card {
    background: var(--dark-bg);
    border-radius: 25px;
    padding: 3rem;
    border: 1px solid rgba(0, 0, 0, 0.08);
    position: relative;
    overflow: hidden;
}

.capability-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-1);
}

.capability-number {
    position: absolute;
    top: 30px;
    right: 30px;
    font-size: 5rem;
    font-weight: 800;
    color: rgba(0, 0, 0, 0.04);
}

.capability-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-1);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

.capability-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.capability-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.capability-specs {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.capability-specs span {
    background: rgba(0, 102, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid rgba(0, 102, 255, 0.3);
}

.certifications {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 4rem;
    flex-wrap: wrap;
}

.cert-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.1rem;
}

.cert-item i {
    font-size: 2rem;
    color: var(--primary-color);
}

/* Hot Parts Carousel */
.parts-carousel {
    overflow: hidden;
    margin: 0 -2rem;
}

.parts-track {
    display: flex;
    gap: 2rem;
    padding: 2rem;
    animation: scroll 30s linear infinite;
}

.parts-track:hover {
    animation-play-state: paused;
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.part-card {
    min-width: 300px;
    background: var(--dark-card);
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    position: relative;
}

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

.part-tag {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    z-index: 1;
}

.part-tag.hot {
    background: linear-gradient(135deg, #ff6b6b, #ee5a6f);
}

.part-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.part-info {
    padding: 1.5rem;
}

.part-info h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.part-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.part-category {
    display: inline-block;
    background: var(--tag-blue-soft-mid);
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.85rem;
    color: var(--tag-blue);
}

.part-inquiry-btn {
    width: 100%;
    padding: 0.8rem;
    margin-top: 1rem;
    background: var(--gradient-1);
    border: none;
    border-radius: 10px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.part-inquiry-btn:hover {
    transform: scale(1.05);
}

.carousel-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.carousel-btn {
    width: 50px;
    height: 50px;
    background: var(--dark-card);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.carousel-btn:hover {
    background: var(--primary-color);
    transform: scale(1.1);
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1) 0%, rgba(0, 212, 255, 0.1) 100%);
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1.2rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
}

.btn > i {
    flex-shrink: 0;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 102, 255, 0.4);
}

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

.btn-outline:hover {
    transform: translateY(-3px);
    background: var(--primary-color);
    color: white;
    box-shadow: 0 12px 32px rgba(0, 102, 255, 0.25);
}

.btn-whatsapp {
    background: #25D366;
    color: white;
}

.btn-whatsapp:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(37, 211, 102, 0.4);
}

/* Footer */
.footer {
    background: var(--dark-card);
    padding: 4rem 0 2rem;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-col h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.footer-col p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 0.8rem;
}

.footer-col ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(0, 0, 0, 0.06);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.contact-info li {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

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

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-1);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

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

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

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --logo-height: 68px;
        --navbar-offset: 92px;
    }

    .nav-menu {
        position: fixed;
        top: var(--navbar-offset);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--navbar-offset));
        background: rgba(255, 255, 255, 0.98);
        flex-direction: column;
        padding: 2rem;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .brands-grid,
    .services-grid,
    .why-us-grid {
        grid-template-columns: 1fr;
    }
    
    .facility-showcase {
        grid-template-columns: 1fr;
    }
    
    .core-services {
        flex-direction: column;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}