/* Reset et variables CSS */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Mode clair */
    --primary-light: #2c3e50;
    --secondary-light: #3498db;
    --accent-light: #e74c3c;
    --success-light: #27ae60;
    --warning-light: #f39c12;
    --bg-light: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-bg-light: rgba(255, 255, 255, 0.95);
    --text-light: #333;
    --text-secondary-light: #555;
    
    /* Mode sombre */
    --primary-dark: #1a252f;
    --secondary-dark: #00d4ff;
    --accent-dark: #ff6b6b;
    --success-dark: #51cf66;
    --warning-dark: #ffd43b;
    --bg-dark: linear-gradient(135deg, #0c0c0c 0%, #1a1a2e 50%, #16213e 100%);
    --card-bg-dark: rgba(26, 32, 44, 0.95);
    --text-dark: #e2e8f0;
    --text-secondary-dark: #a0aec0;
    
    /* Variables actives (par défaut mode sombre) */
    --primary-color: var(--primary-dark);
    --secondary-color: var(--secondary-dark);
    --accent-color: var(--accent-dark);
    --success-color: var(--success-dark);
    --warning-color: var(--warning-dark);
    --bg-gradient: var(--bg-dark);
    --card-bg: var(--card-bg-dark);
    --text-color: var(--text-dark);
    --text-secondary: var(--text-secondary-dark);
    
    /* Autres variables */
    --white: #ffffff;
    --black: #000000;
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --shadow-color: rgba(0, 0, 0, 0.3);
    --glow-primary: rgba(0, 212, 255, 0.5);
    --glow-accent: rgba(255, 107, 107, 0.5);
    --border-radius: 20px;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s ease;
    --transition-bounce: all 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Toggle pour mode clair */
.light-mode {
    --primary-color: var(--primary-light);
    --secondary-color: var(--secondary-light);
    --accent-color: var(--accent-light);
    --success-color: var(--success-light);
    --warning-color: var(--warning-light);
    --bg-gradient: var(--bg-light);
    --card-bg: var(--card-bg-light);
    --text-color: var(--text-light);
    --text-secondary: var(--text-secondary-light);
    --glass-border: rgba(0, 0, 0, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.1);
}

/* Styles globaux avec animations premium */
html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-gradient);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    font-weight: 400;
    letter-spacing: -0.01em;
}

/* Particules flottantes animées */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 15% 85%, var(--glow-primary) 0%, transparent 50%),
        radial-gradient(circle at 85% 15%, var(--glow-accent) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 30%);
    z-index: -2;
    animation: particleFloat 15s ease-in-out infinite alternate;
    opacity: 0.6;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="1" fill="rgba(0,212,255,0.2)"/><circle cx="40" cy="80" r="1" fill="rgba(255,107,107,0.2)"/><circle cx="70" cy="70" r="1" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
    z-index: -1;
    animation: starField 30s linear infinite;
}

@keyframes particleFloat {
    0% {
        transform: translateX(-10px) translateY(-10px) scale(1);
        opacity: 0.6;
    }
    50% {
        transform: translateX(20px) translateY(-20px) scale(1.1);
        opacity: 0.8;
    }
    100% {
        transform: translateX(-5px) translateY(10px) scale(0.9);
        opacity: 0.4;
    }
}

@keyframes starField {
    from { transform: translateY(0); }
    to { transform: translateY(-100px); }
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    padding: 12px 20px;
    cursor: pointer;
    z-index: 10000;
    transition: var(--transition);
    box-shadow: 0 8px 32px var(--shadow-color);
}

.theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px var(--shadow-color);
}

.theme-toggle::before {
    content: '🌙';
    font-size: 1.2rem;
    transition: var(--transition);
}

.light-mode .theme-toggle::before {
    content: '☀️';
}

header {
    background: var(--glass-bg);
    backdrop-filter: blur(30px);
    border: 1px solid var(--glass-border);
    padding: 3rem 0;
    text-align: center;
    margin: 20px 20px 2rem 20px;
    border-radius: var(--border-radius);
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 60px var(--shadow-color);
    animation: slideDown 1s ease-out;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    50% { left: 100%; }
    100% { left: 100%; }
}

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

header h1 {
    font-size: 4rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color), var(--success-color));
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    animation: gradientShift 4s ease-in-out infinite, titlePulse 2s ease-in-out infinite alternate;
    text-shadow: 0 0 30px var(--glow-primary);
    letter-spacing: -0.02em;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes titlePulse {
    from {
        filter: drop-shadow(0 0 10px var(--glow-primary)) brightness(1);
    }
    to {
        filter: drop-shadow(0 0 20px var(--glow-primary)) brightness(1.2);
    }
}

#header nav {
    background: var(--glass-bg);
    backdrop-filter: blur(25px);
    border: 1px solid var(--glass-border);
    border-radius: 30px;
    margin: 0 2rem;
    padding: 1.5rem 2rem;
    position: sticky;
    top: 30px;
    z-index: 1000;
    box-shadow: 0 15px 35px var(--shadow-color);
    animation: navSlideIn 1.2s ease-out;
    transition: var(--transition);
}

@keyframes navSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

#header nav:hover {
    transform: translateY(-3px);
    box-shadow: 0 25px 50px var(--shadow-color);
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

nav li {
    margin: 0.3rem;
    position: relative;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    padding: 1rem 2rem;
    border-radius: 25px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition-bounce);
    position: relative;
    overflow: hidden;
    display: inline-block;
    letter-spacing: 0.5px;
    background: transparent;
    border: 1px solid transparent;
}

nav a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition);
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    transition: var(--transition);
    transform: translateX(-50%);
}

nav a:hover::before {
    left: 100%;
}

nav a:hover::after {
    width: 80%;
}

nav a:hover,
nav a.active {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: var(--white);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 10px 25px var(--glow-primary);
    border: 1px solid var(--secondary-color);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

/* Contenu principal avec animations premium */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
}

section {
    background: var(--card-bg);
    backdrop-filter: blur(25px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 3rem;
    margin-bottom: 2.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 60px var(--shadow-color);
    animation: sectionReveal 0.8s ease-out both;
}

@keyframes sectionReveal {
    from {
        opacity: 0;
        transform: translateY(50px) scale(0.95);
        filter: blur(5px);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0);
    }
}

section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--secondary-color), transparent);
    animation: topLineGlow 3s ease-in-out infinite;
}

@keyframes topLineGlow {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

section:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 30px 80px var(--shadow-color);
    border-color: var(--secondary-color);
}

section:hover::before {
    height: 3px;
    box-shadow: 0 0 20px var(--secondary-color);
}

/* Titres avec effets premium */
h2 {
    font-size: 2.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 2rem;
    position: relative;
    padding-bottom: 1rem;
    letter-spacing: -0.02em;
    animation: titleEntrance 1s ease-out both;
}

@keyframes titleEntrance {
    from {
        opacity: 0;
        transform: translateX(-30px);
        filter: blur(3px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
        filter: blur(0);
    }
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color), var(--success-color));
    border-radius: 2px;
    animation: lineExpand 1.2s ease-out both;
    box-shadow: 0 2px 15px var(--glow-primary);
}

@keyframes lineExpand {
    from { 
        width: 0; 
        opacity: 0;
    }
    to { 
        width: 100px; 
        opacity: 1;
    }
}

h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    position: relative;
    animation: fadeInLeft 0.8s ease-out both;
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Paragraphes améliorés */
p {
    font-size: 1.15rem;
    line-height: 1.8;
    margin-bottom: 1.2rem;
    color: var(--text-secondary);
    font-weight: 400;
    animation: fadeInUp 0.6s ease-out both;
}

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

/* Grille de projets ultra-premium */
#projects div[style*="grid"] {
    display: grid !important;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)) !important;
    gap: 2.5rem !important;
    margin: 3rem 0 !important;
}

/* Cartes de projet premium */
#projects div[style*="border"] {
    border: none !important;
    background: var(--glass-bg) !important;
    backdrop-filter: blur(20px) !important;
    border: 1px solid var(--glass-border) !important;
    border-radius: var(--border-radius) !important;
    padding: 2.5rem !important;
    transition: var(--transition-bounce) !important;
    position: relative !important;
    overflow: hidden !important;
    animation: cardSlideIn 0.8s ease-out both !important;
}

@keyframes cardSlideIn {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

#projects div[style*="border"]::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color), var(--success-color));
    transition: var(--transition);
}

#projects div[style*="border"]::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, var(--glow-primary), transparent);
    transition: var(--transition);
    transform: translate(-50%, -50%);
    border-radius: 50%;
    opacity: 0;
}

#projects div[style*="border"]:hover {
    transform: translateY(-15px) scale(1.03) !important;
    box-shadow: 0 25px 60px var(--shadow-color) !important;
    border-color: var(--secondary-color) !important;
}

#projects div[style*="border"]:hover::before {
    height: 5px;
    box-shadow: 0 0 25px var(--secondary-color);
}

#projects div[style*="border"]:hover::after {
    width: 100px;
    height: 100px;
    opacity: 0.1;
}

#projects div[style*="border"] h3 {
    font-size: 1.6rem;
    margin-bottom: 1.2rem;
    color: var(--secondary-color);
    position: relative;
}

#projects div[style*="border"] p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

#projects div[style*="border"] a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.05rem;
    transition: var(--transition);
    position: relative;
    display: inline-block;
    padding: 8px 16px;
    border-radius: 10px;
    background: transparent;
    border: 1px solid var(--secondary-color);
}

#projects div[style*="border"] a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: var(--secondary-color);
    transition: var(--transition);
    z-index: -1;
    border-radius: 10px;
}

#projects div[style*="border"] a:hover {
    color: var(--white);
    transform: translateX(5px);
    box-shadow: 0 5px 20px var(--glow-primary);
}

#projects div[style*="border"] a:hover::before {
    width: 100%;
}

/* Section chatbot ultra-premium */
main section div[style*="gradient"] {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color)) !important;
    background-size: 400% 400% !important;
    border-radius: var(--border-radius) !important;
    padding: 3rem !important;
    margin: 3rem 0 !important;
    text-align: center !important;
    position: relative !important;
    overflow: hidden !important;
    border: 2px solid transparent !important;
    animation: gradientAnimation 8s ease infinite, megaPulse 4s ease-in-out infinite !important;
    box-shadow: 0 20px 60px var(--shadow-color), inset 0 1px 0 rgba(255, 255, 255, 0.1) !important;
}

@keyframes gradientAnimation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes megaPulse {
    0%, 100% {
        box-shadow: 0 20px 60px var(--shadow-color), 0 0 0 0 var(--glow-primary);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 25px 80px var(--shadow-color), 0 0 40px 10px transparent;
        transform: scale(1.02);
    }
}

main section div[style*="gradient"]::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(transparent, var(--secondary-color), transparent);
    animation: rotate 4s linear infinite;
    z-index: -1;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

main section div[style*="gradient"] h3 {
    color: var(--white) !important;
    font-size: 2.2rem !important;
    font-weight: 800 !important;
    margin-bottom: 1.5rem !important;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3) !important;
    animation: textGlow 2s ease-in-out infinite alternate !important;
}

@keyframes textGlow {
    from { text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3); }
    to { text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3), 0 0 30px rgba(255, 255, 255, 0.5); }
}

main section div[style*="gradient"] p {
    color: rgba(255, 255, 255, 0.95) !important;
    font-size: 1.2rem !important;
    font-weight: 500 !important;
    text-shadow: 0 1px 10px rgba(0, 0, 0, 0.3) !important;
}

main section div[style*="gradient"] a {
    background: var(--accent-color) !important;
    color: var(--white) !important;
    padding: 16px 32px !important;
    border-radius: 30px !important;
    text-decoration: none !important;
    display: inline-block !important;
    margin-top: 1.5rem !important;
    font-weight: 700 !important;
    font-size: 1.1rem !important;
    transition: var(--transition-bounce) !important;
    position: relative !important;
    overflow: hidden !important;
    border: 2px solid transparent !important;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3) !important;
}

main section div[style*="gradient"] a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: var(--transition);
}

main section div[style*="gradient"] a::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transition: var(--transition);
    transform: translate(-50%, -50%);
}

main section div[style*="gradient"] a:hover::before {
    left: 100%;
}

main section div[style*="gradient"] a:hover::after {
    width: 300px;
    height: 300px;
}

main section div[style*="gradient"] a:hover {
    background: #c0392b !important;
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 15px 40px rgba(192, 57, 43, 0.6) !important;
    border-color: rgba(255, 255, 255, 0.3) !important;
}

/* Footer premium */
footer {
    background: var(--glass-bg);
    backdrop-filter: blur(30px);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    text-align: center;
    padding: 3rem 2rem;
    margin: 4rem 2rem 2rem 2rem;
    border-radius: var(--border-radius);
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 60px var(--shadow-color);
    animation: footerSlideUp 1s ease-out both;
}

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

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color), var(--success-color));
    animation: footerGlow 3s ease-in-out infinite;
}

@keyframes footerGlow {
    0%, 100% { 
        opacity: 0.5;
        box-shadow: none;
    }
    50% { 
        opacity: 1;
        box-shadow: 0 0 20px var(--secondary-color);
    }
}

footer p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Animations d'entrée séquentielles */
section:nth-child(1) { animation-delay: 0.1s; }
section:nth-child(2) { animation-delay: 0.3s; }
section:nth-child(3) { animation-delay: 0.5s; }
section:nth-child(4) { animation-delay: 0.7s; }

#projects div[style*="border"]:nth-child(1) { animation-delay: 0.2s; }
#projects div[style*="border"]:nth-child(2) { animation-delay: 0.4s; }

/* Responsive Design Premium */
@media (max-width: 768px) {
    .theme-toggle {
        top: 15px;
        right: 15px;
        padding: 10px 15px;
    }
    
    header {
        margin: 15px 15px 2rem 15px;
        padding: 2rem 1rem;
    }
    
    header h1 {
        font-size: 2.5rem;
    }
    
    #header nav {
        margin: 0 1rem;
        padding: 1rem 1.5rem;
        border-radius: 20px;
    }
    
    nav ul {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    nav a {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }
    
    main {
        padding: 0 1rem;
    }
    
    section {
        padding: 2rem;
        margin-bottom: 2rem;
    }
    
    h2 {
        font-size: 2.2rem;
    }
    
    #projects div[style*="grid"] {
        grid-template-columns: 1fr !important;
        gap: 2rem !important;
    }
    
    main section div[style*="gradient"] {
        padding: 2rem !important;
    }
    
    main section div[style*="gradient"] h3 {
        font-size: 1.8rem !important;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 2rem;
    }
    
        section {
            padding: 1.5rem;
        }
    }

    #contact {
    main section div[style*="gradient"] {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color)) !important;
        background-size: 400% 400% !important;
        border-radius: var(--border-radius) !important;
        padding: 3rem !important;
        margin: 3rem 0 !important;
        text-align: center !important;
        position: relative !important;
        overflow: hidden !important;
        border: 2px solid transparent !important;
        animation: gradientAnimation 8s ease infinite, megaPulse 4s ease-in-out infinite !important;
        box-shadow: 0 20px 60px var(--shadow-color), inset 0 1px 0 rgba(255, 255, 255, 0.1) !important;
    }

@keyframes gradientAnimation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes megaPulse {
    0%, 100% {
        box-shadow: 0 20px 60px var(--shadow-color), 0 0 0 0 var(--glow-primary);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 25px 80px var(--shadow-color), 0 0 40px 10px transparent;
        transform: scale(1.02);
    }
}  
    }