/* ============================================
   VARIABLES & THÈMES
   ============================================ */

:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --border-color: #e0e0e0;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.75rem;
    --border-radius-lg: 1.5rem;

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    --font-family-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'Monaco', 'Courier New', monospace;
}

/* Thème sombre */
body.dark-theme {
    --text-primary: #f0f0f0;
    --text-secondary: #b0b0b0;
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --border-color: #3a3a3a;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-sans);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.25rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

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

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

/* ============================================
   CONTAINER & LAYOUT
   ============================================ */

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

section {
    padding: var(--spacing-2xl) 0;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: border-color var(--transition-base);
    box-shadow: var(--shadow-sm);
}

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

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

.logo-icon {
    font-size: 1.75rem;
    animation: spin 3s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.nav-main {
    flex: 1;
    margin: 0 var(--spacing-lg);
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

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

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

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

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

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

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    transition: transform var(--transition-fast);
    padding: var(--spacing-xs);
}

.theme-toggle:hover {
    transform: scale(1.2) rotate(20deg);
}

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

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    transition: all var(--transition-fast);
    border-radius: 2px;
}

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

.hero {
    padding: calc(var(--spacing-2xl) * 1.5) 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-text {
    animation: slideInLeft 0.8s var(--transition-base);
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
}

.hero-title .word {
    display: inline-block;
    animation: fadeInUp 0.6s var(--transition-base) backwards;
}

.hero-title .word:nth-child(1) { animation-delay: 0.1s; }
.hero-title .word:nth-child(2) { animation-delay: 0.2s; }
.hero-title .word:nth-child(3) { animation-delay: 0.3s; }
.hero-title .word:nth-child(4) { animation-delay: 0.4s; }

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.6s var(--transition-base) 0.5s backwards;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    animation: fadeInUp 0.6s var(--transition-base) 0.6s backwards;
}

.hero-visual {
    position: relative;
    height: 400px;
    animation: slideInRight 0.8s var(--transition-base);
}

.geometric-shape {
    position: absolute;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0.1;
    border-radius: var(--border-radius-lg);
}

.shape-1 {
    width: 300px;
    height: 300px;
    top: 0;
    right: 0;
    animation: float 4s ease-in-out infinite;
}

.shape-2 {
    width: 200px;
    height: 200px;
    bottom: 0;
    left: 50px;
    animation: float 5s ease-in-out infinite;
    animation-delay: 0.5s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    top: 150px;
    right: 100px;
    animation: float 6s ease-in-out infinite;
    animation-delay: 1s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-30px); }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid transparent;
    border-radius: var(--border-radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1rem;
    text-decoration: none;
}

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

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

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

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

.btn-small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

/* ============================================
   FEATURES SECTION
   ============================================ */

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

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    font-size: 2.25rem;
}

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

.feature-card {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    display: block;
    animation: fadeIn 0.6s var(--transition-base);
}

.feature-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.project-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

.project-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform var(--transition-base);
}

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

.project-info {
    padding: var(--spacing-lg);
}

.project-info h3 {
    color: var(--text-primary);
}

.project-link {
    display: inline-block;
    margin-top: var(--spacing-md);
    color: var(--primary-color);
    font-weight: 600;
    transition: transform var(--transition-fast);
}

.project-link:hover {
    transform: translateX(5px);
}

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

/* ============================================
   PROJECTS LARGE GRID (Projects Page)
   ============================================ */

.projects-grid-large {
    display: grid;
    gap: var(--spacing-2xl);
}

.project-card-large {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    align-items: center;
}

.project-card-large:nth-child(even) {
    direction: rtl;
}

.project-card-large:nth-child(even) > * {
    direction: ltr;
}

.project-card-large:hover {
    box-shadow: var(--shadow-xl);
}

.project-image-large {
    width: 100%;
    height: 300px;
    border-radius: var(--border-radius-lg);
    transition: transform var(--transition-base);
}

.project-card-large:hover .project-image-large {
    transform: scale(1.05);
}

.project-details {
    padding: var(--spacing-lg);
}

.project-tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: var(--spacing-md);
}

.project-details h3 {
    font-size: 1.75rem;
    color: var(--text-primary);
}

.project-details p {
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.tech-tag {
    display: inline-block;
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
}

.project-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* ============================================
   FILTER SECTION (Projects Page)
   ============================================ */

.filter-section {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg) 0;
}

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

.filter-btn {
    padding: var(--spacing-xs) var(--spacing-lg);
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-color: transparent;
}

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

.page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-2xl) 0;
}

.page-header h1 {
    margin-bottom: var(--spacing-md);
}

.page-header p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.about-text h2 {
    color: var(--text-primary);
    font-size: 2rem;
}

.about-text h3 {
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-top: var(--spacing-lg);
}

.values-list {
    list-style: none;
    margin-top: var(--spacing-md);
}

.values-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-secondary);
}

.values-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.avatar-box {
    display: flex;
    justify-content: center;
    align-items: center;
}

.avatar-placeholder {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 8rem;
    box-shadow: var(--shadow-xl);
    animation: float 4s ease-in-out infinite;
}

.profile-photo {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-color);
    box-shadow: var(--shadow-xl);
    animation: float 4s ease-in-out infinite;
}

/* ============================================
   SKILLS SECTION
   ============================================ */

.skills-section {
    background-color: var(--bg-secondary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
}

.skill-category h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
    font-size: 1.25rem;
}

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

.skill-item {
    animation: fadeIn 0.6s var(--transition-base);
}

.skill-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.skill-percent {
    color: var(--primary-color);
}

.skill-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 10px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 10px;
    transition: width 1s ease-out;
    animation: progressBar 1.5s ease-out;
}

@keyframes progressBar {
    0% { width: 0 !important; }
}

/* ============================================
   TIMELINE SECTION
   ============================================ */

.timeline {
    position: relative;
    padding: var(--spacing-2xl) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
}

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

.timeline-item:nth-child(odd) .timeline-date {
    text-align: right;
    padding-right: var(--spacing-lg);
}

.timeline-item:nth-child(even) {
    direction: rtl;
}

.timeline-item:nth-child(even) > * {
    direction: ltr;
}

.timeline-date {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.5rem;
    position: relative;
}

.timeline-date::after {
    content: '';
    position: absolute;
    width: 15px;
    height: 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    top: 50%;
    transform: translateY(-50%);
    right: -37px;
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 3px var(--primary-color);
}

.timeline-content {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

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

.timeline-content p {
    margin: 0;
    font-size: 0.95rem;
}

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

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

.service-card {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--border-color);
    transition: all var(--transition-base);
    cursor: pointer;
}

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

.service-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

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

.service-features {
    list-style: none;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.service-features li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding-left: var(--spacing-lg);
    position: relative;
}

.service-features li::before {
    content: '·';
    position: absolute;
    left: var(--spacing-sm);
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* ============================================
   PRICING SECTION
   ============================================ */

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.pricing-card {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
    position: relative;
}

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

.pricing-card.featured {
    border-color: var(--primary-color);
    box-shadow: 0 0 30px rgba(102, 126, 234, 0.2);
    transform: scale(1.05);
}

.featured-badge {
    position: absolute;
    top: -12px;
    right: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.pricing-header h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.pricing-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.pricing-price {
    margin: var(--spacing-lg) 0;
}

.price-currency {
    font-size: 1.5rem;
    vertical-align: super;
}

.price-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.price-period {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.pricing-features {
    list-style: none;
    margin: var(--spacing-lg) 0;
}

.pricing-features li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
}

/* ============================================
   PROCESS SECTION
   ============================================ */

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    align-items: center;
}

.step-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.process-step {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-base);
}

.process-step:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    transform: translateY(-5px);
}

.step-arrow {
    text-align: center;
    font-size: 1.5rem;
    color: var(--primary-color);
    display: none;
}

.process-step h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
}

.contact-info h2 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.contact-item {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.contact-icon {
    font-size: 2rem;
    min-width: 50px;
    display: flex;
    align-items: center;
}

.contact-details h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.contact-details a,
.contact-details p {
    color: var(--text-secondary);
    margin: 0;
}

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

.social-link-large {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.social-link-large:hover {
    transform: translateX(10px);
}

/* ============================================
   FORM STYLES
   ============================================ */

.contact-form {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
}

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

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

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-family-sans);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group input[type="tel"]:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-group.checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.form-group.checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.form-group.checkbox label {
    margin: 0;
    cursor: pointer;
}

.error-message {
    color: var(--error-color);
    font-size: 0.85rem;
    margin-top: var(--spacing-xs);
    display: none;
}

.form-group.error .error-message {
    display: block;
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: var(--error-color);
}

.form-status {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    display: none;
}

.form-status.success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    display: block;
}

.form-status.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    display: block;
}

/* ============================================
   FAQ SECTION
   ============================================ */

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.faq-item {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.faq-question:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
}

.faq-question h4 {
    margin: 0;
    color: var(--text-primary);
    flex: 1;
}

.faq-toggle {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: bold;
    transition: transform var(--transition-fast);
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
    padding: 0 var(--spacing-lg);
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: var(--spacing-lg);
}

.faq-answer p {
    margin: 0;
    color: var(--text-secondary);
}

/* ============================================
   CTA SECTION
   ============================================ */

.cta {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.cta h2 {
    color: white;
    margin-bottom: var(--spacing-md);
}

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

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

.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

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

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0;
}

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

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

.footer-section ul li a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

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

.social-link {
    color: var(--text-secondary);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.social-link:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

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

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .nav-list {
        gap: var(--spacing-md);
    }

    .menu-toggle {
        display: flex;
    }

    .nav-main {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-primary);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: var(--spacing-lg) 0;
        margin: 0;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
    }

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

    .nav-list {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

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

    .hero-visual {
        height: 300px;
    }

    .geometric-shape {
        opacity: 0.05;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    .avatar-placeholder {
        width: 200px;
        height: 200px;
        font-size: 5rem;
    }

    .profile-photo {
        width: 200px;
        height: 200px;
    }

    .timeline::before {
        left: 10px;
    }

    .timeline-item {
        grid-template-columns: 1fr;
        margin-bottom: var(--spacing-lg);
    }

    .timeline-date {
        text-align: left;
        padding-right: 0;
    }

    .timeline-date::after {
        left: -37px;
        right: auto;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .project-card-large {
        grid-template-columns: 1fr;
    }

    .project-card-large:nth-child(even) {
        direction: ltr;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .process-steps {
        grid-template-columns: 1fr;
    }

    .step-arrow {
        display: block;
        transform: rotate(90deg);
    }

    .faq-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    section {
        padding: var(--spacing-lg) 0;
    }

    .hero-buttons {
        gap: var(--spacing-sm);
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }

    .project-actions {
        flex-direction: column;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .pricing-card.featured {
        transform: scale(1);
    }

    .filter-buttons {
        flex-direction: column;
    }

    .filter-btn {
        width: 100%;
    }
}

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

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

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

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

.hidden {
    display: none !important;
}

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