/* ==========================================
   VARIABLES CSS - THÈMES
   ========================================== */
:root {
    /* Dark Mode Colors */
    --bg-primary: #1C1C1C;
    --bg-secondary: #2C2C2C;
    --text-primary: #FFFFFF;
    --text-secondary: #CCCCCC;
    --accent-primary: #00CCFF;
    --accent-secondary: #FF7722;

    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);

    /* Transitions */
    --transition: all 0.3s ease;
}

[data-theme="light"] {
    /* Light Mode Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F5F5F5;
    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --accent-primary: #00B4D8;
    --accent-secondary: #FF6600;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* ==========================================
   RESET & BASE STYLES
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ==========================================
   TYPOGRAPHY
   ========================================== */
h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    line-height: 1.3;
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 600;
    line-height: 1.4;
}

p {
    font-size: 1rem;
    line-height: 1.6;
}

/* ==========================================
   THEME TOGGLE BUTTON
   ========================================== */
.theme-toggle {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 1000;
    background: var(--accent-primary);
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.25rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    filter: brightness(1.1);
}

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

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

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

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

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    position: relative;
}

.hero-title {
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 750px;
    margin-left: auto;
    margin-right: auto;
}

/* ==========================================
   SECTIONS
   ========================================== */
.section {
    padding: 5rem 0;
    background: var(--bg-primary);
}

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

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--accent-primary);
    margin: 1rem auto 0;
    border-radius: 2px;
}

/* ==========================================
   FILTERS (Projects)
   ========================================== */
.filters {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid transparent;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--accent-primary);
}

.filter-btn.active {
    background: var(--accent-primary);
    color: white;
}

/* ==========================================
   PROJECTS GRID
   ========================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-primary);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.project-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--bg-secondary);
    position: relative;
}

.placeholder {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-secondary);
    font-weight: 500;
}

.project-content {
    padding: 1.5rem;
}

.project-title {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.project-date {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.project-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.tag {
    padding: 0.25rem 0.75rem;
    background: var(--accent-primary);
    color: white;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 500;
}

/* ==========================================
   SKILLS GRID
   ========================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.skill-icon {
    font-size: 2.5rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.skill-category h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.skill-category li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* ==========================================
   CERTIFICATIONS GRID
   ========================================== */
.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.certification-card {
    background: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.cert-badge {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.certification-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.cert-date {
    font-size: 0.875rem;
    color: var(--accent-primary);
    font-weight: 600;
    margin-bottom: 1rem;
}

.cert-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==========================================
   TESTIMONIALS CAROUSEL
   ========================================== */
.testimonials-carousel {
    position: relative;
    max-width: 800px;
    margin: 0 auto 2rem;
    padding: 0 3rem;
}

.testimonials-wrapper {
    position: relative;
    overflow: hidden;
}

.testimonial {
    display: none;
    text-align: center;
    padding: 2rem;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.testimonial.active {
    display: block;
    opacity: 1;
}

.testimonial-avatar {
    margin-bottom: 1.5rem;
}

.avatar-placeholder {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--accent-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto;
}

.testimonial-quote {
    font-size: 1.125rem;
    font-style: italic;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.testimonial-author {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.testimonial-position {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--accent-primary);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    z-index: 10;
}

.carousel-btn:hover {
    background: var(--accent-secondary);
}

.carousel-btn.prev {
    left: 0;
}

.carousel-btn.next {
    right: 0;
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--accent-primary);
    transform: scale(1.2);
}

/* ==========================================
   CONTACT SECTION
   ========================================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.contact-info h3,
.pricing h3 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.contact-item i {
    color: var(--accent-primary);
    font-size: 1.25rem;
    width: 30px;
}

.contact-item a, .footer-small a, .hero-subtitle a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.contact-item a:hover, .footer-small a:hover, .hero-subtitle a:hover {
    color: var(--accent-primary);
}

.availability {
    margin-top: 1rem;
}

.availability p {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.availability i {
    color: var(--accent-primary);
}

.price-card {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    text-align: center;
}

.price-card h4 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.pricing .btn {
    margin-top: 1rem;
    width: 100%;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    background: var(--bg-secondary);
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    align-items: center;
}

.footer-left {
    color: var(--text-secondary);
}

.footer-small {
    font-size: 0.75rem;
    margin-top: 0.5rem;
}

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

.footer-right {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.footer-right a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: var(--transition);
}

.footer-right a:hover {
    background: var(--accent-secondary);
    transform: scale(1.1);
}

/* ==========================================
   MODAL
   ========================================== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    overflow-y: auto;
}

.modal-content {
    background-color: var(--bg-primary);
    margin: 5% auto;
    padding: 2rem;
    border-radius: 12px;
    max-width: 800px;
    position: relative;
    box-shadow: var(--shadow-lg);
}

.modal-close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 2rem;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--bg-secondary);
}

/* ==========================================
   ANIMATIONS
   ========================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.8s ease-out forwards;
}

.fade-in:nth-child(2) {
    animation-delay: 0.2s;
}

.fade-in:nth-child(3) {
    animation-delay: 0.4s;
}

/* Intersection Observer animations */
.observe-fade {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.observe-fade.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */
@media (max-width: 768px) {
    .theme-toggle {
        top: 1rem;
        right: 1rem;
        width: 45px;
        height: 45px;
    }

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

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

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

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

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 1.5rem;
    }

    .footer-right {
        justify-content: center;
    }

    .testimonials-carousel {
        padding: 0 2rem;
    }

    .carousel-btn {
        width: 35px;
        height: 35px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .section {
        padding: 3rem 0;
    }

    .filters {
        gap: 0.5rem;
    }

    .filter-btn {
        padding: 0.4rem 1rem;
        font-size: 0.875rem;
    }
}