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

/* ===== VARIABLES CSS ===== */
:root {
    --primary-color: #333;
    --secondary-color: gold;
    --accent-color: #ffd700;
    --light-bg: #f8f9fa;
    --dark-bg: #222;
    --text-light: #fff;
    --text-dark: #333;
    --text-gray: #666;
    --card-bg: #fff;
    --card-shadow: rgba(0, 0, 0, 0.08);
    --border-color: transparent;
    
    /* Responsive sizes */
    --container-max: 1200px;
    --container-padding: 1rem;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    
    /* Typography */
    --font-base: 1rem;
    --font-sm: 0.875rem;
    --font-lg: 1.125rem;
    --font-xl: 1.5rem;
    --font-xxl: 2rem;
    --font-xxxl: 2.5rem;
}

/* Dark Mode Variables */
body.dark-mode {
    --primary-color: #1a1a1a;
    --secondary-color: #ffd700;
    --accent-color: #ffd700;
    --light-bg: #1a1a1a;
    --dark-bg: #0d0d0d;
    --text-light: #fff;
    --text-dark: #e0e0e0;
    --text-gray: #b0b0b0;
    --card-bg: #2a2a2a;
    --card-shadow: rgba(0, 0, 0, 0.3);
    --border-color: rgba(255, 215, 0, 0.1);
}

/* ===== BASE STYLES (Mobile First) ===== */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: var(--font-base);
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--light-bg);
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Smooth fade-in animation */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

body.loaded {
    animation: fadeIn 0.8s ease-out forwards;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* For fixed header offset */
}

/* ===== HEADER (Responsive) ===== */
header {
    background: var(--primary-color);
    color: var(--text-light);
    padding: var(--space-sm) var(--space-md);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
    max-width: var(--container-max);
    margin: 0 auto;
}

.header-top > div {
    flex: 1;
}

header h1 {
    font-size: var(--font-xl);
    font-weight: 600;
    margin-bottom: var(--space-xs);
    text-align: center;
}

/* ===== THEME TOGGLE BUTTON ===== */
.theme-toggle {
    background: none;
    border: 2px solid var(--secondary-color);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    color: var(--secondary-color);
    flex-shrink: 0;
}

.theme-toggle:hover {
    background: rgba(255, 215, 0, 0.1);
    transform: scale(1.1) rotate(20deg);
}

.theme-toggle:focus-visible {
    outline: 3px solid var(--secondary-color);
    outline-offset: 2px;
    text-align: center;
}


.tagline {
    color: var(--secondary-color);
    font-size: var(--font-sm);
    font-weight: 300;
    text-align: center;
    margin-bottom: var(--space-sm);
    opacity: 0.9;
}

/* ===== NAVIGATION (Responsive) ===== */
nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    padding: 0;
    margin: var(--space-sm) 0 0 0;
}

nav ul li a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    padding: var(--space-xs) var(--space-sm);
    border-radius: 4px;
    transition: all 0.3s ease;
    font-size: var(--font-sm);
    white-space: nowrap;
}

nav ul li a:hover,
nav ul li a:focus {
    color: var(--secondary-color);
    background-color: rgba(255, 215, 0, 0.1);
    transform: translateY(-2px);
    outline: 2px solid var(--secondary-color);
}

/* ===== MAIN CONTENT (Padding for fixed header) ===== */
main {
    padding-top: 160px; /* Adjusted for fixed header */
    min-height: calc(100vh - 200px);
}

/* ===== SECTIONS ===== */
section {
    padding: var(--space-xl) var(--space-md);
    max-width: var(--container-max);
    margin: 0 auto;
}

section h2 {
    font-size: var(--font-xxl);
    color: var(--primary-color);
    margin-bottom: var(--space-md);
    text-align: center;
    position: relative;
}

section h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--secondary-color);
    margin: var(--space-xs) auto var(--space-lg);
}

.section-subtitle {
    color: var(--text-gray);
    font-size: var(--font-lg);
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--space-xl);
    font-weight: 300;
    line-height: 1.5;
}

/* ===== ABOUT SECTION (Responsive) ===== */
.about-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    animation: fadeIn 1s ease-out;
}

.profile-pic {
    width: min(250px, 80vw);
    height: min(250px, 80vw);
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid var(--secondary-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.profile-pic:hover {
    transform: scale(1.05);
}

.about-text {
    text-align: center;
    max-width: 800px;
}

.about-text p {
    margin-bottom: var(--space-lg);
    font-size: var(--font-lg);
    line-height: 1.7;
    color: var(--text-gray);
}

/* ===== SKILLS TAGS (Responsive) ===== */
.skills h3 {
    font-size: var(--font-xl);
    margin-bottom: var(--space-md);
    color: var(--primary-color);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.skill-tags span {
    background: var(--primary-color);
    color: var(--secondary-color);
    padding: var(--space-xs) var(--space-md);
    border-radius: 25px;
    font-size: var(--font-sm);
    border: 1px solid var(--secondary-color);
    transition: all 0.3s ease;
    cursor: default;
    white-space: nowrap;
}

.skill-tags span:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 215, 0, 0.3);
}

/* ===== PROJECTS MASONRY (Responsive) ===== */
#project-section {
    padding: var(--space-xl) var(--space-md);
}

#project-title {
    margin-bottom: var(--space-sm);
}

/* ===== FILTER BUTTONS ===== */
.filter-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.filter-btn {
    padding: var(--space-xs) var(--space-md);
    background: var(--card-bg);
    color: var(--text-dark);
    border: 2px solid var(--text-gray);
    border-radius: 25px;
    font-size: var(--font-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.filter-btn.active {
    background: var(--secondary-color);
    color: var(--primary-color);
    border-color: var(--secondary-color);
    animation: slideIn 0.3s ease;
}

.projects-masonry {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    max-width: 1400px;
    margin: 0 auto;
    animation: fadeIn 0.8s ease-out;
}

/* ===== PROJECT CARDS (Responsive) ===== */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: var(--space-lg);
    box-shadow: 0 8px 25px var(--card-shadow);
    border: 2px solid var(--border-color);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    min-height: 380px;
    opacity: 1;
    max-height: 1000px;
}

.card.hidden {
    display: none;
    opacity: 0;
    max-height: 0;
}

.card:hover {
    transform: translateY(-8px);
    border-color: var(--secondary-color);
    box-shadow: 0 15px 35px rgba(255, 215, 0, 0.15);
}

.project-category {
    display: inline-block;
    background: rgba(255, 215, 0, 0.1);
    color: var(--secondary-color);
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    border: 1px solid var(--secondary-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    width: fit-content;
}

.card h3 {
    font-size: var(--font-lg);
    color: var(--primary-color);
    margin-bottom: var(--space-sm);
    line-height: 1.3;
    min-height: 3.5em;
}

.card p {
    color: var(--text-gray);
    line-height: 1.6;
    flex-grow: 1;
    margin-bottom: var(--space-lg);
    font-size: var(--font-base);
}

/* ===== TECH TAGS ===== */
.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.tech-tag {
    display: inline-block;
    background: rgba(255, 215, 0, 0.15);
    color: var(--secondary-color);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid rgba(255, 215, 0, 0.3);
    transition: all 0.3s ease;
}

.tech-tag:hover {
    background: rgba(255, 215, 0, 0.25);
    border-color: var(--secondary-color);
}

/* ===== PROJECT LINKS (Responsive) ===== */
.card-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: auto;
}

.card-links a {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: linear-gradient(135deg, var(--primary-color) 0%, #444 100%);
    color: var(--text-light);
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    font-size: var(--font-sm);
    transition: all 0.3s ease;
    border: 2px solid transparent;
    flex: 1;
    min-width: 120px;
    text-align: center;
    white-space: nowrap;
}

.card-links a:hover {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    color: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.card-links a:focus {
    outline: 3px solid var(--secondary-color);
    outline-offset: 2px;
}

/* ===== CONTACT SECTION (Responsive) ===== */
#contact {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 20px;
    margin: var(--space-xl) auto;
    padding: var(--space-xl) var(--space-md);
}

.contact-info {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
    max-width: 800px;
    margin: 0 auto var(--space-xl);
}

.contact-info p {
    background: white;
    padding: var(--space-md);
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    transition: transform 0.3s ease;
}

.contact-info p:hover {
    transform: translateY(-3px);
}

.contact-info strong {
    min-width: 100px;
    color: var(--primary-color);
    font-weight: 600;
}

.contact-info a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
    flex-grow: 1;
}

.contact-info a:hover {
    color: var(--secondary-color);
    border-bottom-color: var(--secondary-color);
}

.availability {
    font-style: italic;
    color: var(--text-gray);
    text-align: center;
    max-width: 600px;
    margin: var(--space-xl) auto 0;
    padding: var(--space-md);
    background: white;
    border-radius: 10px;
    border-left: 5px solid var(--secondary-color);
    font-size: var(--font-lg);
    line-height: 1.6;
}

/* ===== FOOTER (Responsive) ===== */
footer {
    background: var(--dark-bg);
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
    padding: var(--space-xl) var(--space-md);
    margin-top: var(--space-xl);
    border-top: 3px solid var(--secondary-color);
}

footer p {
    margin: var(--space-sm) 0;
    font-size: var(--font-sm);
    line-height: 1.5;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin: var(--space-lg) 0;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
}

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

/* ===== MEDIA QUERIES ===== */

/* Small phones (up to 375px) */
@media (max-width: 375px) {
    :root {
        --font-base: 0.875rem;
        --font-lg: 1rem;
        --font-xl: 1.25rem;
        --font-xxl: 1.5rem;
    }
    
    header h1 {
        font-size: var(--font-lg);
    }
    
    .tagline {
        font-size: 0.75rem;
    }
    
    nav ul {
        gap: var(--space-sm);
    }
    
    nav ul li a {
        padding: 4px 8px;
        font-size: 0.75rem;
    }
    
    main {
        padding-top: 140px;
    }
    
    .card {
        width: 280px;
        min-height: 350px;
    }
    
    .arrow {
        width: 40px;
        height: 40px;
    }
    
    .carousel-container {
        padding: 0 var(--space-sm);
        gap: var(--space-sm);
    }
}

/* Tablets (768px and up) */
@media (min-width: 768px) {
    :root {
        --font-base: 1rem;
        --font-lg: 1.125rem;
        --font-xl: 1.5rem;
        --font-xxl: 2rem;
        --font-xxxl: 2.5rem;
    }
    
    header h1 {
        font-size: var(--font-xxl);
    }
    
    .tagline {
        font-size: var(--font-lg);
    }
    
    nav ul li a {
        font-size: var(--font-base);
        padding: var(--space-xs) var(--space-md);
    }
    
    .about-content {
        flex-direction: row;
        text-align: left;
    }
    
    .about-text {
        text-align: left;
        padding-left: var(--space-xl);
    }
    
    .skill-tags {
        justify-content: flex-start;
    }
    
    .carousel-container {
        padding: 0 var(--space-lg);
    }
    
    .arrow {
        width: 60px;
        height: 60px;
    }
    
    .contact-info {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop (1024px and up) */
@media (min-width: 1024px) {
    section {
        padding: var(--space-xl) var(--space-lg);
    }
    
    .projects-wrapper {
        max-width: 1400px;
        padding: 0 var(--space-xxl);
    }
    
    .card {
        width: 350px;
        min-height: 400px;
    }
    
    .card.active {
        width: 380px;
    }
    
    .contact-info {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }
    
    .contact-info p {
        padding: var(--space-lg);
    }
}

/* Large Desktop (1200px and up) */
@media (min-width: 1200px) {
    .projects {
        gap: var(--space-xl);
    }
    
    .card {
        width: 380px;
    }
    
    .card.active {
        width: 420px;
    }
}

/* ===== UTILITY CLASSES ===== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

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

.mt-1 { margin-top: var(--space-xs); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }
.mt-5 { margin-top: var(--space-xl); }

.mb-1 { margin-bottom: var(--space-xs); }
.mb-2 { margin-bottom: var(--space-sm); }
.mb-3 { margin-bottom: var(--space-md); }
.mb-4 { margin-bottom: var(--space-lg); }
.mb-5 { margin-bottom: var(--space-xl); }

/* ===== PRINT STYLES ===== */
@media print {
    .arrow, 
    .projects::-webkit-scrollbar,
    nav ul,
    .tagline {
        display: none;
    }
    
    .projects {
        overflow: visible;
        flex-wrap: wrap;
        gap: 20px;
    }
    
    .card {
        width: 48%;
        opacity: 1;
        transform: none;
        break-inside: avoid;
    }
    
    body {
        font-size: 12pt;
        background: white;
    }
    
    a {
        color: black;
        text-decoration: underline;
    }
}

/* ===== STYLES POUR LES FLÈCHES DÉSACTIVÉES ===== */
.arrow:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.arrow:disabled {
    background-color: #666;
}

.arrow:disabled:hover {
    background-color: #666;
    transform: none;
}

.arrow:disabled img {
    filter: invert(0.5);
}

.arrow:disabled:hover img {
    transform: none;
}