/* ===========================
   CSS Reset & Base Styles
   =========================== */

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

:root {
    /* Colors */
    --primary-color: #0066cc;
    --primary-dark: #004a99;
    --primary-light: #3385db;
    --secondary-color: #00a8e8;
    --accent-color: #ff6b35;
    --dark: #1a1a2e;
    --dark-alt: #16213e;
    --gray: #64748b;
    --gray-light: #e2e8f0;
    --gray-dark: #475569;
    --white: #ffffff;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-body: 'Inter', sans-serif;
    --font-heading: 'Poppins', sans-serif;
    
    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===========================
   Typography
   =========================== */

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

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--gray-dark);
}

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

/* ===========================
   Buttons
   =========================== */

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

/* ===========================
   Navigation
   =========================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--primary-color);
}

.logo-image {
    height: 50px;
    width: auto;
    object-fit: contain;
}

.logo i {
    font-size: 2rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--dark);
    font-weight: 500;
    position: relative;
    transition: var(--transition);
}

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

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

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

.nav-cta {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.btn-phone {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: var(--white);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: var(--transition);
}

.btn-phone:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--dark);
    cursor: pointer;
}

/* ===========================
   Hero Section
   =========================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        url('../images/hero-waterproofing-membrane.jpg'),
        linear-gradient(135deg, rgba(0, 102, 204, 0.85), rgba(0, 74, 153, 0.9));
    background-size: cover;
    background-position: center;
    background-blend-mode: overlay;
    opacity: 0.4;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 50%, rgba(0, 168, 232, 0.2), transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: var(--spacing-3xl) 0;
}

.hero-text {
    max-width: 800px;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
}

.title-line {
    display: block;
    animation: fadeInUp 0.8s ease-out forwards;
    opacity: 0;
}

.title-line:nth-child(1) {
    animation-delay: 0.2s;
}

.title-line:nth-child(2) {
    animation-delay: 0.4s;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
    animation: fadeInUp 0.8s ease-out 0.6s forwards;
    opacity: 0;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.8s ease-out 0.8s forwards;
    opacity: 0;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    animation: fadeInUp 0.8s ease-out 1s forwards;
    opacity: 0;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    font-family: var(--font-heading);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.hero-scroll a {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--white);
    font-size: 2rem;
    animation: bounce 2s infinite;
}

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

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

/* ===========================
   Section Headers
   =========================== */

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-tag {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(0, 102, 204, 0.1);
    color: var(--primary-color);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
}

.section-title {
    margin-bottom: var(--spacing-md);
}

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

/* ===========================
   About Section
   =========================== */

.about {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

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

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

.about-badge {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.about-badge i {
    font-size: 2rem;
    color: var(--accent-color);
}

.about-badge strong {
    display: block;
    font-size: 1rem;
    color: var(--dark);
}

.about-badge span {
    display: block;
    font-size: 0.875rem;
    color: var(--gray);
}

.about-text h3 {
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.about-text > p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.feature-item {
    display: flex;
    gap: 1rem;
    padding: var(--spacing-md);
    background: var(--gray-light);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.feature-item i {
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-top: 0.25rem;
}

.feature-item h4 {
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.feature-item p {
    font-size: 0.875rem;
    color: var(--gray);
    margin: 0;
}

.certifications h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.cert-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.cert-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: var(--white);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
}

/* ===========================
   Services Section
   =========================== */

.services {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--gray-light) 0%, var(--white) 100%);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.service-card {
    position: relative;
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.service-card.featured {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
}

.service-card.featured h3,
.service-card.featured p,
.service-card.featured li {
    color: var(--white);
}

.service-card.featured .service-icon {
    background: rgba(255, 255, 255, 0.2);
}

.service-card.featured .service-icon i {
    color: var(--white);
}

.popular-badge {
    position: absolute;
    top: -12px;
    right: 2rem;
    background: var(--accent-color);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.service-icon {
    width: 70px;
    height: 70px;
    background: rgba(0, 102, 204, 0.1);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

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

.service-card h3 {
    margin-bottom: var(--spacing-md);
}

.service-card > p {
    margin-bottom: var(--spacing-md);
    color: var(--gray-dark);
}

.service-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    color: var(--gray-dark);
}

.service-features i {
    color: var(--success);
    font-size: 0.875rem;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-weight: 600;
    transition: var(--transition);
}

.service-card.featured .service-link {
    color: var(--white);
}

.service-link:hover {
    gap: 0.75rem;
}

/* ===========================
   Projects Section
   =========================== */

.projects {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.projects-filter {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    background: var(--white);
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-md);
    font-weight: 600;
    color: var(--gray-dark);
    cursor: pointer;
    transition: var(--transition);
}

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.project-card {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: var(--transition);
}

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

.project-image {
    width: 100%;
    height: 300px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.project-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--spacing-lg);
    opacity: 0;
    transition: var(--transition);
}

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

.project-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: var(--white);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.project-overlay h3 {
    color: var(--white);
    margin-bottom: 0.5rem;
}

.project-overlay p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
    margin: 0;
}

.projects-cta {
    text-align: center;
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: var(--radius-xl);
    color: var(--white);
}

.projects-cta h3 {
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.projects-cta p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
}

/* ===========================
   Testimonials Section
   =========================== */

.testimonials {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--gray-light) 0%, var(--white) 100%);
}

.testimonials-slider {
    max-width: 900px;
    margin: 0 auto var(--spacing-xl);
    position: relative;
}

.testimonial-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    display: none;
}

.testimonial-card.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.testimonial-rating {
    display: flex;
    justify-content: center;
    gap: 0.25rem;
    margin-bottom: var(--spacing-md);
}

.testimonial-rating i {
    color: var(--warning);
    font-size: 1.25rem;
}

.testimonial-text {
    font-size: 1.25rem;
    font-style: italic;
    color: var(--gray-dark);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.author-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-color);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.author-info strong {
    display: block;
    color: var(--dark);
    font-size: 1.125rem;
}

.author-info span {
    color: var(--gray);
    font-size: 0.875rem;
}

.testimonials-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.testimonial-nav-btn {
    width: 50px;
    height: 50px;
    border: 2px solid var(--primary-color);
    background: var(--white);
    color: var(--primary-color);
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition);
}

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

.testimonial-dots {
    display: flex;
    gap: 0.5rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--gray-light);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--primary-color);
    width: 30px;
    border-radius: 6px;
}

.review-platforms {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.platform {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.platform i {
    color: var(--warning);
    font-size: 1.25rem;
}

.platform strong {
    color: var(--dark);
    font-size: 1.125rem;
}

/* ===========================
   Contact Section
   =========================== */

.contact {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-3xl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    color: var(--white);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.contact-icon i {
    font-size: 1.5rem;
}

.contact-card h3 {
    color: var(--white);
    margin-bottom: 0.5rem;
}

.contact-card p {
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
    font-size: 0.875rem;
}

.contact-link {
    display: block;
    color: var(--white);
    font-weight: 600;
    font-size: 1.125rem;
    margin-top: 0.5rem;
}

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

.contact-form-wrapper {
    background: var(--gray-light);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

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

.form-group label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.875rem;
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}

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

.btn-submit {
    width: 100%;
    position: relative;
}

.btn-loading {
    display: none;
}

.btn-submit.loading .btn-text {
    display: none;
}

.btn-submit.loading .btn-loading {
    display: block;
}

.form-message {
    padding: 1rem;
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 600;
    display: none;
}

.form-message.success {
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
    border: 2px solid var(--success);
    display: block;
}

.form-message.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 2px solid var(--danger);
    display: block;
}

/* ===========================
   Footer
   =========================== */

.footer {
    background: var(--dark);
    color: var(--white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.footer-logo-image {
    height: 60px;
    width: auto;
    object-fit: contain;
    filter: brightness(0) invert(1);
}

.footer-logo i {
    font-size: 2rem;
    color: var(--primary-light);
}

.footer-col p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-md);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.footer-col h4 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

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

.footer-col ul li {
    margin-bottom: 0.75rem;
}

.footer-col ul a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-col ul a:hover {
    color: var(--white);
    padding-left: 0.5rem;
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

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

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

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

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

/* ===========================
   Back to Top Button
   =========================== */

.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* ===========================
   Responsive Design
   =========================== */

@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 80px;
        flex-direction: column;
        background: var(--white);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-lg) 0;
        gap: 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        padding: var(--spacing-sm) 0;
    }
    
    .btn-phone {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .logo-image {
        height: 40px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-logo-image {
        height: 50px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
    .logo-image {
        height: 35px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .projects-filter {
        gap: 0.5rem;
    }
    
    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
    
    .footer-logo-image {
        height: 40px;
    }
}