/* ===== VARIABLES & RESET ===== */
:root {
    /* Civil Engineering Colors */
    --primary: #2A5CAA;      /* Engineering Blue */
    --primary-dark: #1E4480;
    --primary-light: #4A7FC6;
    --secondary: #F5A623;    /* Construction Orange */
    --secondary-dark: #D88C1F;
    --accent: #27AE60;       /* Safety Green */
    --accent-light: #2ECC71;
    
    /* Neutral Colors */
    --dark: #2C3E50;
    --gray-dark: #5D6D7E;
    --gray: #95A5A6;
    --gray-light: #ECF0F1;
    --light: #F8F9FA;
    --white: #FFFFFF;
    
    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Poppins', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 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(0,0,0,0.15);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.18);
    
    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Container */
    --container-width: 1200px;
    --container-padding: 1rem;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== ACCESSIBILITY ===== */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary);
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    z-index: 9999;
    transition: top var(--transition-normal);
    border-radius: 0 0 4px 0;
    font-weight: 600;
}

.skip-to-content:focus {
    top: 0;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--dark);
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: 1.25rem;
}

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

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

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

/* ===== LAYOUT ===== */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

/* ===== 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: all var(--transition-normal);
}

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

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--container-padding);
    min-height: 80px;
}

.nav-brand img {
    height: 50px;
    width: auto;
    transition: transform var(--transition-normal);
}

.nav-brand img:hover {
    transform: scale(1.05);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 40px;
    height: 40px;
    position: relative;
    z-index: 1001;
    padding: 0;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--dark);
    position: relative;
    transition: background var(--transition-fast);
    margin: 0 auto;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--dark);
    left: 0;
    transition: all var(--transition-normal);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    bottom: -8px;
}

.nav-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
    transform: rotate(45deg);
    top: 0;
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
    transform: rotate(-45deg);
    bottom: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-menu a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
}

.nav-menu a:hover {
    color: var(--primary);
    background: var(--gray-light);
}

.btn-wa {
    background: #25D366;
    color: white !important;
    padding: 10px 20px !important;
    border-radius: var(--radius-md);
    font-weight: 600;
}

.btn-wa:hover {
    background: #128C7E;
    color: white !important;
    transform: translateY(-2px);
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, rgba(42, 92, 170, 0.9) 0%, rgba(66, 133, 244, 0.8) 100%), 
                url('https://images.unsplash.com/photo-1504307651254-35680f356dfd?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--white);
    padding: 150px 0 var(--spacing-xl);
    margin-top: 80px;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
}

.hero-content {
    flex: 1;
}

.hero-title {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    color: var(--dark);
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 16px 32px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    transition: all var(--transition-normal);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    min-height: 56px;
}

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

.btn-primary:hover {
    background: var(--secondary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 2px solid var(--white);
    color: var(--white);
}

.btn-secondary:hover {
    background: var(--white);
    color: var(--primary);
    transform: translateY(-3px);
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.feature {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 10px 20px;
    border-radius: 50px;
    font-size: 0.9rem;
}

.feature i {
    color: var(--secondary);
}

.hero-image {
    flex: 1;
    display: none;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

/* ===== SECTIONS COMMON ===== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-md);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--secondary);
    border-radius: 2px;
}

.section-subtitle {
    color: var(--gray-dark);
    font-size: 1.1rem;
}

/* ===== SERVICES SECTION ===== */
.services {
    background: var(--light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.service-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border-top: 4px solid var(--primary);
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.service-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

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

.service-card h3 {
    color: var(--dark);
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
}

.service-card > p {
    color: var(--gray-dark);
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.service-features {
    list-style: none;
    margin-top: auto;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    color: var(--gray-dark);
    font-size: 0.95rem;
}

.service-features i {
    color: var(--accent);
    font-size: 0.9rem;
}

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

.services-cta p {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

/* ===== PROJECTS SECTION ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.project-image {
    height: 250px;
    overflow: hidden;
    position: relative;
}

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

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

.project-content {
    padding: var(--spacing-lg);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.project-content h3 {
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.project-content p {
    color: var(--gray-dark);
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.project-meta {
    display: flex;
    justify-content: space-between;
    color: var(--gray);
    font-size: 0.9rem;
    margin-top: auto;
}

.project-meta i {
    margin-right: 5px;
    color: var(--secondary);
}

/* ===== ABOUT SECTION ===== */
.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

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

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.feature-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.feature-item i {
    font-size: 2rem;
    color: var(--primary);
    margin-top: 5px;
    flex-shrink: 0;
}

.feature-item h4 {
    margin-bottom: 5px;
    color: var(--dark);
}

.feature-item p {
    color: var(--gray-dark);
    font-size: 0.95rem;
    margin: 0;
}

.about-location {
    background: var(--light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary);
}

.about-location h4 {
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 10px;
}

.about-location address {
    font-style: normal;
    color: var(--gray-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.location-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.location-features span {
    display: flex;
    align-items: center;
    gap: 5px;
    background: var(--white);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--dark);
}

.location-features i {
    color: var(--accent);
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.service-area {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-lg);
    border-top: 4px solid var(--secondary);
}

.service-area h4 {
    color: var(--primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 10px;
}

.service-area ul {
    list-style: none;
    columns: 2;
}

.service-area li {
    margin-bottom: 10px;
    color: var(--gray-dark);
    position: relative;
    padding-left: 20px;
}

.service-area li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

/* ===== CONTACT SECTION ===== */
.contact {
    background: linear-gradient(135deg, var(--light) 0%, #f5f7fa 100%);
}

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

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.info-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    transition: transform var(--transition-normal);
}

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

.info-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.info-icon i {
    font-size: 1.5rem;
    color: var(--white);
}

.info-content h4 {
    color: var(--dark);
    margin-bottom: 10px;
}

.info-content p, .info-content address {
    color: var(--gray-dark);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.info-content address {
    font-style: normal;
}

.map-link, .whatsapp-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--gray-light);
    border-radius: var(--radius-md);
    color: var(--dark);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
    margin-top: 10px;
}

.map-link:hover {
    background: var(--primary);
    color: var(--white);
}

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

.whatsapp-btn:hover {
    background: #128C7E;
    transform: translateY(-2px);
}

.contact-form {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.contact-form h3 {
    color: var(--primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(42, 92, 170, 0.1);
}

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

.btn-submit {
    width: 100%;
    padding: 18px 32px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.btn-submit:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

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

.form-note {
    font-size: 0.9rem;
    color: var(--gray);
    margin-top: var(--spacing-md);
    text-align: center;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--dark);
    color: var(--gray-light);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-brand img {
    height: 50px;
    width: auto;
    margin-bottom: var(--spacing-md);
}

.footer-brand p {
    color: var(--gray);
    margin-bottom: var(--spacing-lg);
    max-width: 400px;
}

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

.footer-social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--white);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-size: 1.1rem;
}

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

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-xl);
}

.link-group h4 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.link-group ul {
    list-style: none;
}

.link-group li {
    margin-bottom: 10px;
}

.link-group a {
    color: var(--gray);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.link-group a:hover {
    color: var(--white);
}

.link-group address {
    font-style: normal;
    color: var(--gray);
    line-height: 1.8;
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
}

.copyright p {
    color: var(--gray);
    margin: 0;
    font-size: 0.9rem;
}

.footer-legal {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.footer-legal a {
    color: var(--gray);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

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

/* ===== WHATSAPP FLOAT ===== */
.whatsapp-float {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: #25D366;
    color: white;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px 25px;
    text-decoration: none;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    transition: all var(--transition-normal);
    font-weight: 600;
    font-size: 1rem;
}

.whatsapp-float:hover {
    background: #128C7E;
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.whatsapp-float i {
    font-size: 1.5rem;
}

.whatsapp-text {
    display: none;
}

/* ===== BACK TO TOP ===== */
.back-to-top {
    position: fixed;
    bottom: 100px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    z-index: 998;
    box-shadow: var(--shadow-md);
}

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

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

/* ===== RESPONSIVE DESIGN ===== */

/* Tablet */
@media (min-width: 768px) {
    :root {
        --container-padding: 2rem;
    }
    
    .hero .container {
        flex-direction: row;
    }
    
    .hero-image {
        display: block;
    }
    
    .about-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr 2fr;
    }
    
    .whatsapp-text {
        display: inline;
    }
}

/* Desktop */
@media (min-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    }
    
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Mobile */
@media (max-width: 767px) {
    html {
        font-size: 14px;
    }
    
    section {
        padding: var(--spacing-lg) 0;
    }
    
    .hero {
        padding: 120px 0 var(--spacing-lg);
        background-attachment: scroll;
    }
    
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-cta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .hero-features {
        justify-content: center;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        flex-direction: column;
        background: var(--white);
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-md);
        transition: left var(--transition-normal);
        gap: 0;
        height: calc(100vh - 80px);
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-menu a {
        padding: var(--spacing-md);
        border-radius: var(--radius-sm);
        justify-content: flex-start;
        width: 100%;
        border-bottom: 1px solid var(--gray-light);
    }
    
    .nav-menu a:last-child {
        border-bottom: none;
    }
    
    .whatsapp-float {
        bottom: 20px;
        right: 20px;
        padding: 12px 20px;
        font-size: 0.9rem;
    }
    
    .whatsapp-float i {
        font-size: 1.3rem;
    }
    
    .back-to-top {
        bottom: 90px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
    
    .contact-form {
        padding: var(--spacing-lg);
    }
    
    .service-area ul {
        columns: 1;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .services-grid,
    .projects-grid,
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .whatsapp-float {
        padding: 10px;
        width: 50px;
        height: 50px;
        border-radius: 50%;
    }
    
    .whatsapp-text {
        display: none;
    }
    
    .whatsapp-float i {
        font-size: 1.5rem;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .navbar,
    .hero-cta,
    .whatsapp-float,
    .back-to-top,
    .footer-social {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
        color: #000;
    }
    
    a {
        color: #000 !important;
        text-decoration: underline !important;
    }
    
    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 90%;
    }
    
    .container {
        max-width: 100%;
        padding: 0;
    }
    
    section {
        padding: 1cm 0;
        page-break-inside: avoid;
    }
    
    .btn-primary,
    .btn-secondary {
        border: 1px solid #000 !important;
        background: none !important;
        color: #000 !important;
        padding: 0 !important;
    }
}

/* ===== DARK MODE SUPPORT ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --dark: #F8F9FA;
        --white: #1A1A1A;
        --light: #2D2D2D;
        --gray-light: #3A3A3A;
        --gray-dark: #BDC3C7;
    }
    
    .navbar {
        background: #2D2D2D;
    }
    
    .service-card,
    .project-card,
    .info-card,
    .contact-form {
        background: #2D2D2D;
    }
    
    .about-location {
        background: #3A3A3A;
    }
    
    .footer {
        background: #1A1A1A;
    }
}

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

.animate-on-scroll {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.service-card:nth-child(1) { animation-delay: 0.1s; }
.service-card:nth-child(2) { animation-delay: 0.2s; }
.service-card:nth-child(3) { animation-delay: 0.3s; }
.service-card:nth-child(4) { animation-delay: 0.4s; }
.service-card:nth-child(5) { animation-delay: 0.5s; }
.service-card:nth-child(6) { animation-delay: 0.6s; }
.service-card:nth-child(7) { animation-delay: 0.7s; }
.service-card:nth-child(8) { animation-delay: 0.8s; }