/* ===========================
   CSS Variables
   =========================== */
:root {
    /* Colors - Light Theme */
    --primary-color: #4285f4;
    --primary-dark: #3367d6;
    --secondary-color: #34a853;
    --accent-color: #fbbc04;
    --danger-color: #ea4335;
    
    --text-dark: #1a1a1a;
    --text-medium: #4a5568;
    --text-light: #718096;
    --text-white: #ffffff;
    
    --bg-white: #ffffff;
    --bg-light: #f7fafc;
    --bg-gray: #edf2f7;
    --bg-dark: #1a202c;
    
    --border-color: #e2e8f0;
    --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);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Container */
    --container-max-width: 1200px;
}

/* Dark Theme */
[data-theme="dark"] {
    --text-dark: #f7fafc;
    --text-medium: #cbd5e0;
    --text-light: #a0aec0;
    
    --bg-white: #1a202c;
    --bg-light: #2d3748;
    --bg-gray: #4a5568;
    --bg-dark: #0f1419;
    
    --border-color: #4a5568;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.5);
}

/* Theme Transition */
body {
    transition: background-color 0.3s ease, color 0.3s 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(--text-dark);
    background-color: var(--bg-white);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul {
    list-style: none;
}

/* ===========================
   Container
   =========================== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===========================
   Navigation
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-white);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

[data-theme="dark"] .navbar {
    background: rgba(26, 32, 44, 0.95);
    border-bottom: 1px solid var(--border-color);
}

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

.navbar.hidden {
    transform: translateY(-100%);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-image {
    height: 100px !important;
    width: 100px !important;
    object-fit: contain;
    display: block;
    transition: transform var(--transition-fast);
}

.logo:hover .logo-image {
    transform: scale(1.05);
}

/* Navigation Controls */
.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-left: var(--spacing-lg);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--bg-light);
    color: var(--text-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 1px solid var(--border-color);
    user-select: none;
}

/* Only apply hover on devices that support hover (not touch devices) */
@media (hover: hover) and (pointer: fine) {
    .theme-toggle:hover {
        background: var(--primary-color);
        color: var(--text-white);
        transform: rotate(15deg);
    }
}

/* Active state for all devices - simpler animation */
.theme-toggle:active {
    transform: scale(0.9);
    background: var(--primary-color);
    color: var(--text-white);
}

.theme-toggle:focus {
    outline: none;
}

/* On touch devices, ensure no lingering styles */
@media (hover: none) {
    .theme-toggle {
        transition: transform 0.1s ease;
    }
}

.language-selector {
    display: flex;
    gap: 4px;
    background: var(--bg-light);
    padding: 4px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.lang-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--text-medium);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    background: transparent;
    user-select: none;
}

/* Only apply hover on devices that support hover (not touch devices) */
@media (hover: hover) and (pointer: fine) {
    .lang-btn:hover:not(.active) {
        color: var(--primary-color);
        background: rgba(66, 133, 244, 0.1);
    }
}

.lang-btn.active {
    background: var(--primary-color);
    color: var(--text-white);
    cursor: default;
}

.lang-btn:active:not(.active) {
    transform: scale(0.95);
}

.lang-btn:focus {
    outline: none;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-weight: 500;
    color: var(--text-medium);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.nav-link.btn-contact {
    background: var(--primary-color);
    color: var(--text-white);
    padding: var(--spacing-sm) var(--spacing-lg);
}

.nav-link.btn-contact:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-sm);
}

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

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

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

/* Particle Network Canvas */
#particleCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

[data-theme="dark"] .hero-background {
    background: rgba(10, 14, 39, 0.5);
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    padding: var(--spacing-3xl) 0;
    position: relative;
    z-index: 1;
}

.hero-subtitle {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: clamp(2rem, 5vw, var(--font-size-5xl));
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    color: var(--text-dark);
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--text-medium);
    margin-bottom: var(--spacing-2xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-3xl);
    animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3xl);
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.8s both;
}

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

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-medium);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

/* ===========================
   Buttons
   =========================== */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    text-align: center;
}

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

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

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

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

/* ===========================
   Section Styles
   =========================== */
.section {
    padding: var(--spacing-3xl) 0;
}

.section:nth-child(even) {
    background: var(--bg-light);
}

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

.section-title {
    font-size: clamp(2rem, 4vw, var(--font-size-4xl));
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-medium);
    max-width: 600px;
    margin: 0 auto;
}

/* ===========================
   Services Section
   =========================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.service-card {
    background: var(--bg-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

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

.service-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-2xl);
    color: var(--text-white);
}

.service-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

.service-description {
    color: var(--text-medium);
    line-height: 1.7;
}

/* ===========================
   Projects Section
   =========================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.project-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

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

.project-image {
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.project-logo-wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-logo {
    max-width: 80%;
    max-height: 80%;
    object-fit: contain;
    filter: brightness(0) invert(1);
    transition: all var(--transition-base);
}

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

.project-icon {
    font-size: 4rem;
    color: var(--text-white);
    opacity: 0.9;
    transition: all var(--transition-base);
}

.project-card:hover .project-icon {
    transform: scale(1.1);
    opacity: 1;
}

.project-content {
    padding: var(--spacing-xl);
}

.project-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

.project-description {
    color: var(--text-medium);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.project-tags {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-light);
    color: var(--primary-color);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border: 1px solid var(--border-color);
}

/* ===========================
   Partners Section
   =========================== */
.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-2xl);
    max-width: 1000px;
    margin: 0 auto;
}

.partner-card {
    background: var(--bg-white);
    padding: var(--spacing-3xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
    border: 2px solid var(--border-color);
}

.partner-card.featured {
    border-color: var(--primary-color);
}

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

.partner-card.clickable {
    cursor: pointer;
}

.partner-card.clickable:hover {
    border-color: var(--secondary-color);
}

.partner-logo {
    width: 100%;
    height: 180px;
    margin: 0 auto var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.partner-logo-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: transform var(--transition-base);
}

.partner-card:hover .partner-logo-img {
    transform: scale(1.05);
}

.partner-logo.google-logo {
    background: white;
    border-radius: var(--radius-md);
}

[data-theme="dark"] .partner-logo.google-logo {
    background: white;
}

.partner-logo.ibm-logo {
    background: white;
    border-radius: var(--radius-md);
}

[data-theme="dark"] .partner-logo.ibm-logo {
    background: white;
}

.view-certs-btn {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-white);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    justify-content: center;
    width: 100%;
}

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

.partner-name {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-dark);
}

.partner-description {
    color: var(--text-medium);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
    font-size: var(--font-size-lg);
}

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

.badge {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--primary-color);
    color: var(--text-white);
    border-radius: var(--radius-full);
    font-size: var(--font-size-base);
    font-weight: 600;
}

/* ===========================
   Certificates Section
   =========================== */
.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.certificate-card {
    background: var(--bg-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.certificate-card a {
    text-decoration: none;
    color: inherit;
    display: block;
}

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

.certificate-badge {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-base);
}

.certificate-badge img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.certificate-card:hover .certificate-badge {
    transform: scale(1.05);
}

.certificate-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    background: var(--bg-light);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
}

.certificate-card h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-dark);
    line-height: 1.5;
}

/* ===========================
   Clients Section
   =========================== */
.clients-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    max-width: 900px;
    margin: 0 auto;
}

.client-card {
    background: var(--bg-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

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

.client-logo {
    width: 100%;
    height: 100px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
}

.client-logo-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: transform var(--transition-base);
}

.client-card:hover .client-logo-img {
    transform: scale(1.1);
}

.client-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-dark);
}

/* ===========================
   Modal Styles
   =========================== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.modal-content {
    background-color: var(--bg-white);
    margin: auto;
    padding: var(--spacing-3xl);
    border-radius: var(--radius-xl);
    max-width: 900px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    position: relative;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close-modal {
    color: var(--text-medium);
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    font-size: var(--font-size-3xl);
    font-weight: bold;
    cursor: pointer;
    transition: all var(--transition-fast);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
}

.close-modal:hover,
.close-modal:focus {
    color: var(--danger-color);
    background: var(--bg-light);
}

.modal-title {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-dark);
    text-align: center;
}

.certifications-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.certification-item {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.certification-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.certification-item a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.cert-badge {
    width: 100%;
    height: 200px;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.cert-badge img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.certification-item h4 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-dark);
}

.certification-item p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--text-medium);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

/* ===========================
   About Section
   =========================== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

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

.about-paragraph {
    color: var(--text-medium);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
    font-size: var(--font-size-lg);
}

.about-highlights {
    margin-top: var(--spacing-2xl);
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    color: var(--text-medium);
}

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

.about-timeline {
    position: relative;
    padding-left: var(--spacing-xl);
}

.about-timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-2xl);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--spacing-xl) - 6px);
    top: 0;
    width: 14px;
    height: 14px;
    background: var(--primary-color);
    border-radius: var(--radius-full);
    border: 3px solid var(--bg-white);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.timeline-year {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.timeline-content h4 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-dark);
}

.timeline-content p {
    color: var(--text-medium);
    line-height: 1.6;
}

/* ===========================
   Contact Section
   =========================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
}

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

.contact-card {
    background: var(--bg-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    border: 1px solid var(--border-color);
}

.contact-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: var(--text-white);
}

.contact-card h4 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.contact-card p {
    color: var(--text-medium);
}

.contact-card a {
    color: var(--primary-color);
    font-weight: 600;
}

.contact-card a:hover {
    text-decoration: underline;
}

.contact-form-wrapper {
    background: var(--bg-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

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

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

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

.form-group label {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.form-group input,
.form-group textarea {
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.1);
}

.contact-form button {
    grid-column: 1 / -1;
    justify-self: start;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-subtitle {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-text {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

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

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

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

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

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

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

.footer-contact li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    color: rgba(255, 255, 255, 0.7);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
}

/* ===========================
   Scroll to Top Button
   =========================== */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: var(--text-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

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

.scroll-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 968px) {
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .partners-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-wrapper {
        flex-wrap: wrap;
    }
    
    .nav-toggle {
        display: flex;
        order: 2;
    }
    
    .nav-controls {
        order: 3;
        margin-left: auto;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        align-items: stretch;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-20px);
        transition: all var(--transition-base);
        order: 4;
        width: 100%;
    }
    
    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav-link {
        padding: var(--spacing-md);
        text-align: center;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        width: 100%;
    }
    
    .contact-form {
        grid-template-columns: 1fr;
    }
    
    .services-grid,
    .projects-grid,
    .certificates-grid,
    .clients-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        padding: var(--spacing-xl);
    }
    
    .certifications-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-stats {
        gap: var(--spacing-xl);
    }
    
    .stat-number {
        font-size: var(--font-size-3xl);
    }
    
    .scroll-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

/* ===========================
   Utility Classes
   =========================== */
.text-center {
    text-align: center;
}

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }