/* ==========================================
   NAPPA CONSULTING - MAIN STYLESHEET
   Modern, Professional & Responsive Design
   ========================================== */

/* ==========================================
   VARIABLES & RESET
   ========================================== */

:root {
    /* Color Palette - Professional Blue Tech Theme */
    --primary-color: #0066cc;
    --primary-dark: #004999;
    --primary-light: #3385d6;
    --secondary-color: #00c896;
    --accent-color: #ff6b35;

    /* Neutral Colors */
    --dark: #1a1a2e;
    --dark-light: #16213e;
    --gray-dark: #4a5568;
    --gray: #718096;
    --gray-light: #e2e8f0;
    --light: #f7fafc;
    --white: #ffffff;

    /* Gradient */
    --gradient-primary: linear-gradient(135deg, #0066cc 0%, #00c896 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Poppins', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

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

p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--gray-dark);
}

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

/* ==========================================
   UTILITIES
   ========================================== */

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

.section-label {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

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

.section-description {
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
    text-align: center;
    color: var(--gray);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

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

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

.btn-full {
    width: 100%;
    justify-content: center;
}

/* ==========================================
   NAVIGATION
   ========================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-base);
}

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

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-md);
    font-size: 1.5rem;
    font-weight: 800;
}

.logo-text {
    font-family: var(--font-heading);
}

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

.nav-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--gray-dark);
    padding: 0.5rem 0;
    position: relative;
}

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

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

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

.cta-link {
    padding: 0.75rem 1.5rem;
    background: var(--gradient-primary);
    color: var(--white) !important;
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

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

.cta-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 1rem;
    padding-left: 1rem;
    border-left: 1px solid var(--gray-light);
}

.lang-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.lang-link::after {
    display: none;
}

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

.lang-link.active {
    color: var(--primary-color);
    background: rgba(0, 102, 204, 0.1);
}

.lang-separator {
    color: var(--gray-light);
    font-weight: 300;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 0.4rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--dark);
    border-radius: 3px;
    transition: var(--transition-base);
}

/* ==========================================
   HERO SECTION
   ========================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    overflow: hidden;
}

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

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f7fafc 0%, #e2e8f0 100%);
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.05;
    background-image:
        radial-gradient(circle at 20% 20%, var(--primary-color) 1px, transparent 1px),
        radial-gradient(circle at 80% 80%, var(--secondary-color) 1px, transparent 1px);
    background-size: 50px 50px;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-text {
    text-align: center;
    max-width: 900px;
    margin: 0 auto var(--spacing-lg);
}

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

.title-line {
    display: block;
}

.title-highlight {
    display: block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-dark);
    margin-bottom: var(--spacing-md);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.stat-value {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 1rem;
    color: var(--gray-dark);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.6;
    animation: bounce 2s infinite;
}

.scroll-indicator span {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--gray-dark);
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--gray-dark);
    border-radius: 12px;
    position: relative;
}

.mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--gray-dark);
    border-radius: 2px;
    animation: scroll 1.5s infinite;
}

/* ==========================================
   SERVICES SECTION
   ========================================== */

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

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

.service-card {
    position: relative;
    padding: var(--spacing-md);
    background: var(--white);
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
    overflow: hidden;
}

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

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

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

.service-card-featured {
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
}

.service-card-featured .service-title,
.service-card-featured .service-description,
.service-card-featured .service-features li {
    color: var(--white);
}

.featured-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--white);
}

.service-icon {
    width: 4rem;
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-md);
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.service-card-featured .service-icon {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.service-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.service-description {
    margin-bottom: var(--spacing-md);
    color: var(--gray);
}

.service-features {
    list-style: none;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    font-size: 1rem;
    color: var(--gray-dark);
}

.service-features i {
    color: var(--secondary-color);
    font-size: 1rem;
}

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

/* ==========================================
   EXPERTISE SECTION
   ========================================== */

.expertise {
    padding: var(--spacing-xl) 0;
    background: var(--light);
}

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

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

.category-card {
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
}

.category-card:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-xl);
}

.category-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

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

.category-header h3 {
    font-size: 1.5rem;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tech-tag {
    padding: 0.5rem 1rem;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    transition: var(--transition-base);
}

.tech-tag:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.methodology-list,
.sector-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.methodology-item,
.sector-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.75rem;
    background: var(--light);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.methodology-item:hover,
.sector-item:hover {
    background: var(--gray-light);
    transform: translateX(5px);
}

.methodology-item i,
.sector-item i {
    color: var(--secondary-color);
    font-size: 1.25rem;
}

.expertise-visual {
    display: flex;
    align-items: center;
}

.visual-card {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.visual-header {
    margin-bottom: var(--spacing-md);
}

.visual-header h4 {
    font-size: 1.75rem;
    color: var(--dark);
}

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

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

.step-number {
    flex-shrink: 0;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-md);
    font-size: 1.25rem;
    font-weight: 800;
}

.step-content h5 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.step-content p {
    font-size: 1rem;
    color: var(--gray);
}

/* ==========================================
   ABOUT SECTION
   ========================================== */

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

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

.about-text {
    max-width: 600px;
}

.about-description {
    margin-bottom: var(--spacing-md);
}

.about-values {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

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

.value-icon {
    flex-shrink: 0;
    width: 3.5rem;
    height: 3.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-md);
    font-size: 1.5rem;
}

.value-content h4 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.value-content p {
    font-size: 1rem;
    color: var(--gray);
}

.about-card {
    position: relative;
    padding: var(--spacing-lg);
    background: var(--gradient-dark);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.card-decoration {
    position: absolute;
    top: -50px;
    right: -50px;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(0, 200, 150, 0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.about-card-content {
    position: relative;
    z-index: 1;
}

.about-stat-large {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.stat-value-large {
    font-size: 5rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.stat-label-large {
    font-size: 1.25rem;
    color: var(--gray-light);
}

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

.highlight-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-md);
    color: var(--white);
}

.highlight-item i {
    font-size: 1.5rem;
    color: var(--secondary-color);
}

/* ==========================================
   CONTACT SECTION
   ========================================== */

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

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

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

.info-card {
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.info-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.info-item {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--gray-light);
}

.info-item:last-child {
    border-bottom: none;
}

.info-icon {
    flex-shrink: 0;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-md);
}

.info-text h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.info-text p,
.info-text a {
    font-size: 1rem;
    color: var(--gray-dark);
}

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

.social-links {
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.social-links h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

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

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-md);
    font-size: 1.25rem;
    transition: var(--transition-base);
}

.social-icon:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

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

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark);
}

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

.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(0, 102, 204, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

/* ==========================================
   FOOTER
   ========================================== */

.footer {
    padding: var(--spacing-md) 0 var(--spacing-sm);
    background: var(--gradient-dark);
    color: var(--white);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

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

.footer-brand .logo {
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    color: var(--gray-light);
    font-size: 1rem;
}

.footer-column h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--white);
}

.footer-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-column a {
    color: var(--gray-light);
    font-size: 1rem;
    transition: var(--transition-base);
}

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

/* Footer Contact Block */
.footer-contact {
    min-width: 200px;
    flex-shrink: 0;
}

.footer-contact h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--white);
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.footer-contact-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.footer-contact-icon i {
    color: var(--white);
    font-size: 0.875rem;
}

.footer-contact-text {
    display: flex;
    flex-direction: column;
}

.footer-contact-text span {
    font-size: 0.75rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.125rem;
}

.footer-contact-text a,
.footer-contact-text p {
    color: var(--gray-light);
    font-size: 0.9375rem;
    transition: var(--transition-fast);
    margin: 0;
    padding: 0;
}

.footer-contact-text a:hover {
    color: var(--white);
    padding-left: 0;
}

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

.footer-bottom p {
    color: var(--gray-light);
    font-size: 0.875rem;
}

/* ==========================================
   SCROLL TO TOP BUTTON
   ========================================== */

.scroll-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3.5rem;
    height: 3.5rem;
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
    z-index: 999;
}

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

.scroll-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* ==========================================
   ANIMATIONS
   ========================================== */

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

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

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
}

.fade-in {
    animation: fade-in 1s ease forwards;
}

[data-aos] {
    opacity: 0;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
}

[data-aos="fade-up"].aos-animate {
    transform: translateY(0);
}

[data-aos="fade-up"] {
    transform: translateY(30px);
}

[data-aos="fade-right"].aos-animate {
    transform: translateX(0);
}

[data-aos="fade-right"] {
    transform: translateX(-30px);
}

[data-aos="fade-left"].aos-animate {
    transform: translateX(0);
}

[data-aos="fade-left"] {
    transform: translateX(30px);
}

/* ==========================================
   AI SECTION STYLES
   ========================================== */

.ai-section {
    background: var(--light);
    padding: var(--spacing-xl) 0;
}

/* AI Technologies Section */
.ai-tech-section {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.tech-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.tech-header h3 {
    color: var(--dark);
    margin-bottom: var(--spacing-sm);
}

.tech-header p {
    color: var(--gray);
    font-size: 1.125rem;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.tech-category {
    padding: var(--spacing-md);
    background: var(--light);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-base);
}

.tech-category:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--secondary-color);
}

.tech-category h4 {
    color: var(--dark);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tech-category h4 i {
    color: var(--primary-color);
}

.tech-category .tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* AI Use Cases Section */
.ai-use-cases {
    margin-top: var(--spacing-lg);
}

.use-cases-title {
    text-align: center;
    color: var(--dark);
    margin-bottom: var(--spacing-lg);
    font-size: 2rem;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.use-case-card {
    padding: var(--spacing-lg);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border-top: 4px solid var(--primary-color);
}

.use-case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-top-color: var(--secondary-color);
}

.use-case-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.use-case-icon i {
    font-size: 1.75rem;
    color: var(--white);
}

.use-case-card h4 {
    color: var(--dark);
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
}

.use-case-card p {
    color: var(--gray-dark);
    line-height: 1.8;
    font-size: 1rem;
}

/* ==========================================
   RESPONSIVE DESIGN - MOBILE FIRST
   ========================================== */

@media (max-width: 992px) {
    /* Expertise */
    .expertise-content {
        grid-template-columns: 1fr;
    }

    /* About */
    .about-content {
        grid-template-columns: 1fr;
    }

    /* Contact */
    .contact-content {
        grid-template-columns: 1fr;
    }

    /* Footer */
    .footer-content {
        flex-wrap: wrap;
    }

    .footer-brand {
        flex: 1 1 100%;
        margin-bottom: var(--spacing-md);
    }

    .footer-links {
        flex: 1;
    }

    .footer-contact {
        flex: 0 0 auto;
    }
}

@media (max-width: 768px) {
    /* Navigation */
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--white);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-md);
        gap: 0;
        box-shadow: var(--shadow-lg);
        transition: var(--transition-base);
    }

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

    .nav-link {
        width: 100%;
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid var(--gray-light);
    }

    .cta-link {
        margin-top: var(--spacing-sm);
        border-bottom: none;
    }

    .lang-switcher {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        padding-top: var(--spacing-sm);
        margin-top: var(--spacing-sm);
        border-top: 1px solid var(--gray-light);
    }

    /* Hero */
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

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

    /* AI Section */
    .tech-grid {
        grid-template-columns: 1fr;
    }

    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    /* Footer */
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .footer-contact {
        width: 100%;
    }
}

@media (max-width: 576px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .hero-stats {
        grid-template-columns: 1fr;
    }

    .stat-value {
        font-size: 2.5rem;
    }

    .hero {
        padding: 6rem 0 var(--spacing-lg);
    }
}

/* ==========================================
   PRINT STYLES
   ========================================== */

@media print {
    .navbar,
    .hero-buttons,
    .scroll-indicator,
    .scroll-to-top,
    .contact-form {
        display: none;
    }
}