/* ============================================
   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;
}

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

* { 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);
}

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 { max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-lg); }
section { padding: var(--spacing-2xl) 0; }

.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 { 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; }

.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; position: relative; overflow: hidden; }
.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 { 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; }
.feature-card h3 { color: var(--text-primary); margin-bottom: var(--spacing-sm); }
.feature-card p { color: var(--text-secondary); font-size: 0.95rem; }

.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-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 { 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; }

.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; }
.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; }
@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); } }

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

.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; }

.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); }

.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; }
.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; }

.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 { 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); }

@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); }
    .about-grid { grid-template-columns: 1fr; }
    .profile-photo { width: 200px; height: 200px; }
    .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; }
    .services-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; }
    .btn { padding: var(--spacing-sm) var(--spacing-md); font-size: 0.9rem; }
    .project-actions { flex-direction: column; }
    .filter-buttons { flex-direction: column; }
    .filter-btn { width: 100%; }
}