/* ==============================================
   CSS Variables & Reset
   ============================================== */
:root {
    /* Color Palette - Charcoal + Teal (Industrial Confidence) */
    --primary-color: #14B8A6;        /* Teal */
    --primary-dark: #0D9488;
    --primary-light: #5EEAD4;
    
    --secondary-color: #2C3539;      /* Charcoal */
    --secondary-dark: #1A1F22;
    --secondary-light: #3F4A4F;
    
    --accent-color: #F59E0B;         /* Amber accent */
    
    --text-primary: #1A1F22;
    --text-secondary: #5F6C76;
    --text-light: #8B98A5;
    --text-white: #FFFFFF;
    
    --bg-white: #FFFFFF;
    --bg-light: #F8FAFB;
    --bg-dark: #2C3539;
    
    --border-color: #E5E9EC;
    
    /* Typography */
    --font-primary: 'Montserrat', sans-serif;
    --font-secondary: 'Open Sans', sans-serif;
    
    /* Spacing */
    --section-padding: 100px 0;
    --container-padding: 0 20px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.2);
}

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

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

body {
    font-family: var(--font-secondary);
    font-weight: 400;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

/* ==============================================
   Typography
   ============================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

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

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

a:hover {
    color: var(--primary-dark);
}

ul {
    list-style: none;
}

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

/* ==============================================
   Container & Layout
   ============================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--container-padding);
}

.section-padding {
    padding: var(--section-padding);
}

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

.bg-dark {
    background-color: var(--bg-dark);
}

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

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

.section-tag {
    display: inline-block;
    font-family: var(--font-primary);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--primary-color);
    margin-bottom: 1rem;
    position: relative;
    padding-bottom: 8px;
}

.section-tag::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

.section-title {
    margin-bottom: 1.5rem;
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* ==============================================
   Buttons
   ============================================== */
.btn {
    display: inline-block;
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 1rem;
    padding: 12px 32px;
    border-radius: 4px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
    white-space: nowrap;
}

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

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

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

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

.btn-large {
    padding: 16px 40px;
    font-size: 1.125rem;
}

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

/* ==============================================
   Navigation
   ============================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
    background-color: rgba(255, 255, 255, 0.98);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-primary);
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--secondary-color);
    transition: var(--transition-base);
}

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

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-white);
    border-radius: 8px;
    font-weight: 800;
    font-size: 1.125rem;
}

.logo-text {
    font-size: 1.125rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--text-primary);
    position: relative;
    padding: 8px 0;
}

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

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 28px;
    height: 3px;
    background-color: var(--secondary-color);
    transition: var(--transition-base);
    border-radius: 2px;
}

/* ==============================================
   Hero Section
   ============================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(44, 53, 57, 0.85), rgba(44, 53, 57, 0.7));
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--text-white);
    padding: 40px 0;
}

.hero-text {
    max-width: 900px;
    margin: 0 auto 60px;
}

.hero-title {
    color: var(--text-white);
    margin-bottom: 24px;
    font-weight: 800;
    text-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
    padding: 40px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.stat-number {
    font-family: var(--font-primary);
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
}

.stat-label {
    font-size: 0.9375rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.scroll-line {
    width: 2px;
    height: 40px;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.5), transparent);
    animation: scrollAnimation 2s infinite;
}

@keyframes scrollAnimation {
    0%, 100% { opacity: 0; transform: translateY(0); }
    50% { opacity: 1; transform: translateY(10px); }
}

/* Animations */
.animate-fade-up {
    opacity: 0;
    animation: fadeUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

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

/* ==============================================
   Services Preview
   ============================================== */
.services-preview {
    background: linear-gradient(180deg, var(--bg-white) 0%, var(--bg-light) 100%);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.service-card {
    background-color: var(--bg-white);
    padding: 40px 32px;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: 12px;
    color: var(--text-white);
    margin-bottom: 24px;
}

.service-title {
    font-size: 1.375rem;
    margin-bottom: 16px;
    color: var(--secondary-color);
}

.service-description {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--primary-color);
    transition: var(--transition-base);
}

.service-link:hover {
    gap: 12px;
    color: var(--primary-dark);
}

/* ==============================================
   About Section
   ============================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-content .section-tag::after {
    left: 0;
    transform: translateX(0);
}

.about-text {
    font-size: 1.0625rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.about-values {
    display: grid;
    gap: 24px;
    margin: 40px 0;
}

.value-item h4 {
    font-size: 1.125rem;
    color: var(--secondary-color);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.value-item h4::before {
    content: '';
    width: 8px;
    height: 8px;
    background-color: var(--primary-color);
    border-radius: 50%;
}

.value-item p {
    color: var(--text-secondary);
    padding-left: 20px;
}

.certifications {
    margin-top: 40px;
    padding: 32px;
    background-color: var(--bg-white);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.certifications h4 {
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.cert-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.cert-badge {
    padding: 10px 20px;
    background-color: var(--primary-light);
    color: var(--secondary-color);
    border-radius: 24px;
    font-size: 0.875rem;
    font-weight: 600;
    border: 2px solid var(--primary-color);
}

.about-image {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.about-image img {
    width: 100%;
    height: 600px;
    object-fit: cover;
}

.about-badge {
    position: absolute;
    bottom: 32px;
    right: 32px;
    background-color: var(--primary-color);
    color: var(--text-white);
    padding: 24px 32px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.badge-number {
    display: block;
    font-family: var(--font-primary);
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 8px;
}

.badge-text {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ==============================================
   Detailed Services
   ============================================== */
.service-detailed {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.service-detailed.reverse {
    direction: rtl;
}

.service-detailed.reverse > * {
    direction: ltr;
}

.service-detailed-image {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.service-detailed-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.service-detailed:hover .service-detailed-image img {
    transform: scale(1.05);
}

.service-detailed-content h3 {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.service-detailed-content p {
    font-size: 1.0625rem;
    line-height: 1.8;
    margin-bottom: 24px;
}

.service-features {
    margin: 32px 0;
}

.service-features li {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 12px 0;
    color: var(--text-secondary);
}

.service-features li::before {
    content: '✓';
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-color);
    color: var(--text-white);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.875rem;
}

/* ==============================================
   Projects Portfolio
   ============================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 32px;
}

.project-card {
    background-color: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    position: relative;
    overflow: hidden;
    height: 280px;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

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

.project-overlay {
    position: absolute;
    top: 20px;
    right: 20px;
}

.project-tag {
    display: inline-block;
    padding: 8px 16px;
    background-color: var(--primary-color);
    color: var(--text-white);
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 4px;
}

.project-content {
    padding: 28px;
}

.project-title {
    font-size: 1.375rem;
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.project-location {
    font-size: 0.9375rem;
    color: var(--text-light);
    margin-bottom: 16px;
    font-weight: 600;
}

.project-description {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.project-details {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.detail-item {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-light);
    padding: 6px 12px;
    background-color: var(--bg-light);
    border-radius: 4px;
}

/* ==============================================
   Testimonials
   ============================================== */
.testimonials {
    background: linear-gradient(135deg, var(--secondary-dark), var(--secondary-color));
    color: var(--text-white);
}

.testimonials .section-tag {
    color: var(--primary-light);
}

.testimonials .section-title,
.testimonials .section-description {
    color: var(--text-white);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.testimonial-card {
    background-color: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    padding: 40px 32px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-base);
}

.testimonial-card:hover {
    transform: translateY(-8px);
    background-color: rgba(255, 255, 255, 0.12);
    box-shadow: var(--shadow-xl);
}

.testimonial-rating {
    color: var(--accent-color);
    font-size: 1.25rem;
    margin-bottom: 20px;
    letter-spacing: 4px;
}

.testimonial-text {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 28px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 16px;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.author-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--primary-color);
}

.author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-name {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 4px;
}

.author-project {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0;
}

/* ==============================================
   Contact Section
   ============================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}

.contact-info h3 {
    font-size: 1.75rem;
    margin-bottom: 16px;
}

.contact-info > p {
    font-size: 1.0625rem;
    margin-bottom: 40px;
}

.contact-details {
    display: grid;
    gap: 32px;
}

.contact-item {
    display: flex;
    gap: 20px;
}

.contact-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: 8px;
    color: var(--text-white);
}

.contact-text h4 {
    font-size: 1.125rem;
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.contact-text p,
.contact-text a {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

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

.contact-form-wrapper {
    background-color: var(--bg-white);
    padding: 48px;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.contact-form {
    display: grid;
    gap: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--secondary-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-family: var(--font-secondary);
    font-size: 1rem;
    color: var(--text-primary);
    transition: var(--transition-base);
    background-color: var(--bg-white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ==============================================
   Footer
   ============================================== */
.footer {
    background-color: var(--secondary-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 60px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo .logo-text {
    color: var(--text-white);
    font-weight: 800;
}

.footer-description {
    line-height: 1.8;
    margin-bottom: 28px;
}

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-white);
    transition: var(--transition-base);
}

.footer-social a:hover {
    background-color: var(--primary-color);
    transform: translateY(-4px);
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 24px;
}

.footer-links {
    display: grid;
    gap: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-base);
    font-size: 0.9375rem;
}

.footer-links a:hover {
    color: var(--primary-color);
    padding-left: 8px;
}

.footer-contact {
    display: grid;
    gap: 16px;
    font-size: 0.9375rem;
}

.footer-contact a {
    color: rgba(255, 255, 255, 0.7);
}

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

.footer-bottom {
    padding: 32px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 0.875rem;
}

.footer-bottom-links {
    display: flex;
    gap: 16px;
    align-items: center;
}

.footer-bottom-links a {
    color: rgba(255, 255, 255, 0.7);
}

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

.footer-bottom-links span {
    color: rgba(255, 255, 255, 0.3);
}

/* ==============================================
   Scroll to Top Button
   ============================================== */
.scroll-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 52px;
    height: 52px;
    background-color: var(--primary-color);
    color: var(--text-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

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

.scroll-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* ==============================================
   Responsive Design
   ============================================== */
@media (max-width: 1024px) {
    .about-grid,
    .service-detailed {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .service-detailed.reverse {
        direction: ltr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px 0;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--bg-white);
        flex-direction: column;
        padding: 32px 20px;
        box-shadow: var(--shadow-lg);
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        gap: 20px;
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(7px, 7px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.0625rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .hero-buttons .btn {
        width: 100%;
    }
    
    .hero-stats {
        gap: 40px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .contact-form-wrapper {
        padding: 32px 24px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .about-image img {
        height: 400px;
    }
    
    .service-detailed-image img {
        height: 350px;
    }
}

@media (max-width: 480px) {
    .logo-text {
        font-size: 1rem;
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .scroll-to-top {
        bottom: 20px;
        right: 20px;
        width: 48px;
        height: 48px;
    }
}