/* ============================================
   Variables CSS et Reset
   ============================================ */

:root {
    /* Couleurs - Mode Light (par défaut) - Thème B2B */
    --color-primary: #3B82F6; /* Bleu discret pour accent */
    --color-accent: #2563EB; /* Bleu plus foncé pour hover */
    --color-secondary: #1F2937; /* Anthracite */
    --color-background: #F9FAFB; /* Gris très clair (début dégradé) */
    --color-background-end: #F3F4F6; /* Gris très clair (fin dégradé) */
    --color-text: #1F2937; /* Anthracite - texte principal */
    --color-text-secondary: #4B5563; /* Texte secondaire */
    --color-text-light: #6B7280; /* Texte léger */
    --color-white: #FFFFFF;
    --color-border: #E5E7EB; /* Bordures/séparateurs */
    --color-shadow: rgba(0, 0, 0, 0.05);
    --color-shadow-hover: rgba(0, 0, 0, 0.1);
    --color-surface: #FFFFFF; /* Fond blanc pour sections alternées */
    --color-footer-bg: #1F2937;
    
    /* Typographie */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    --font-size-h1: 2.5rem;
    --font-size-h2: 2rem;
    --font-size-h3: 1.5rem;
    
    /* Espacements */
    --spacing-xs: 0.375rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 2.5rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Container */
    --container-max-width: 1200px;
    --container-padding: 1.5rem;
}

/* Mode Dark */
body.dark-mode {
    --color-primary: #3B82F6; /* Bleu identique en dark mode */
    --color-accent: #2563EB; /* Bleu accent identique en dark mode */
    --color-secondary: #E5E7EB;
    --color-background: #111827;
    --color-background-end: #111827; /* Pas de dégradé */
    --color-text: #F9FAFB;
    --color-text-secondary: #D1D5DB;
    --color-text-light: #9CA3AF;
    --color-white: #1F2937;
    --color-border: #374151;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-hover: rgba(0, 0, 0, 0.4);
    --color-surface: #1F2937;
    --color-footer-bg: #111827;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    box-shadow: 0 2px 8px var(--color-shadow);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--container-padding);
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    padding: var(--spacing-xs) 0;
    position: relative;
}

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

.nav-link:hover,
.nav-link:focus {
    color: var(--color-primary);
    outline: none;
}

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

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

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

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

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: none;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--color-text);
    font-size: 1.2rem;
    transition: var(--transition-normal);
    padding: 0;
}

.theme-toggle:hover,
.theme-toggle:focus {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: #FFFFFF;
    transform: scale(1.05);
    outline: none;
}

.theme-toggle:active {
    transform: scale(0.95);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition-fast);
}

/* ============================================
   Container
   ============================================ */

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

/* ============================================
   Hero Section
   ============================================ */

.hero {
    padding: calc(70px + var(--spacing-lg)) var(--container-padding) var(--spacing-lg);
    text-align: center;
    background-color: var(--color-background);
    transition: background-color var(--transition-normal);
}

.hero-profile {
    margin-bottom: var(--spacing-sm);
    display: flex;
    justify-content: center;
}

.hero-photo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-primary);
    box-shadow: 0 4px 12px var(--color-shadow);
    transition: var(--transition-normal);
}

.hero-photo:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 16px var(--color-shadow-hover);
}

.hero-name {
    font-size: var(--font-size-h1);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.hero-title {
    font-size: var(--font-size-h2);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: var(--font-size-large);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.hero-description {
    font-size: var(--font-size-base);
    color: var(--color-text);
    max-width: 700px;
    margin: 0 auto var(--spacing-md);
    line-height: 1.7;
    font-weight: 400;
}

/* ============================================
   Boutons
   ============================================ */

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    font-family: var(--font-family);
}

.btn-primary {
    background-color: var(--color-primary);
    color: #FFFFFF;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
    font-weight: 500;
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--color-accent);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.3);
    transform: translateY(-2px);
    outline: none;
}

.btn-primary:active {
    transform: translateY(0);
}

/* ============================================
   Sections communes
   ============================================ */

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

.section-title {
    font-size: var(--font-size-h2);
    font-weight: 600;
    color: var(--color-secondary);
    text-align: center;
    margin-bottom: var(--spacing-md);
    position: relative;
    padding-bottom: var(--spacing-xs);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--color-primary);
    border-radius: 2px;
}

/* ============================================
   À propos
   ============================================ */

.about {
    background-color: var(--color-surface);
    /* Section blanche */
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text {
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    font-weight: 400;
}

.about-text:last-child {
    margin-bottom: 0;
}

/* ============================================
   Compétences
   ============================================ */

.skills {
    background-color: var(--color-background);
    /* Section avec fond gris */
}

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

.skill-card {
    background-color: var(--color-surface);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px var(--color-shadow);
    transition: var(--transition-normal);
    text-align: center;
}

.skill-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px var(--color-shadow-hover);
}

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

.skill-title {
    font-size: var(--font-size-h3);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.skill-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.6;
    font-weight: 400;
}

/* ============================================
   Façon de travailler
   ============================================ */

.work {
    background-color: var(--color-surface);
    /* Section blanche */
}

.work-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.work-item {
    text-align: center;
    padding: var(--spacing-sm);
}

.work-icon {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.work-item-title {
    font-size: var(--font-size-h3);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.work-item-text {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.6;
    font-weight: 400;
}

/* ============================================
   Contact
   ============================================ */

.contact {
    background-color: var(--color-background);
    /* Section avec fond gris */
}

.contact-intro {
    text-align: center;
    font-size: var(--font-size-large);
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.contact-email {
    text-align: center;
    margin-top: var(--spacing-md);
}

.email-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-large);
    font-weight: 500;
    color: var(--color-primary);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
}

.email-link:hover,
.email-link:focus {
    color: var(--color-accent);
    background-color: rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
    outline: none;
}

.email-link i {
    font-size: 1.5rem;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background-color: var(--color-footer-bg);
    color: #FFFFFF;
    padding: var(--spacing-lg) var(--container-padding);
    margin-top: var(--spacing-xl);
    transition: background-color var(--transition-normal);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-info,
.footer-legal {
    flex: 1;
    min-width: 200px;
}

.footer-company {
    font-weight: 600;
    font-size: var(--font-size-large);
    margin-bottom: var(--spacing-xs);
}

.footer-copyright {
    font-size: var(--font-size-small);
    color: rgba(255, 255, 255, 0.8);
}

.footer-legal p {
    font-size: var(--font-size-small);
    margin-bottom: var(--spacing-xs);
    color: rgba(255, 255, 255, 0.8);
}

.footer-placeholder {
    font-style: italic;
    opacity: 0.7;
}

/* ============================================
   Responsive - Tablet
   ============================================ */

@media (max-width: 1024px) {
    :root {
        --font-size-h1: 2rem;
        --font-size-h2: 1.75rem;
        --spacing-xl: 3rem;
    }
    
    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    .work-content {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    }
}

/* ============================================
   Responsive - Mobile
   ============================================ */

@media (max-width: 768px) {
    :root {
        --font-size-h1: 1.75rem;
        --font-size-h2: 1.5rem;
        --font-size-h3: 1.25rem;
        --container-padding: 1rem;
        --spacing-xl: 1.5rem;
        --spacing-lg: 1.5rem;
        --spacing-md: 1rem;
    }
    
    /* Navigation mobile */
    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background-color: var(--color-surface);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: 0 4px 12px var(--color-shadow);
        transform: translateX(-100%);
        transition: var(--transition-normal);
        gap: var(--spacing-sm);
    }
    
    .nav-actions {
        gap: var(--spacing-xs);
    }
    
    .theme-toggle {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-link {
        width: 100%;
        text-align: center;
        padding: var(--spacing-sm);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    /* Hero */
    .hero {
        padding: calc(60px + var(--spacing-md)) var(--container-padding) var(--spacing-md);
    }
    
    .hero-photo {
        width: 100px;
        height: 100px;
        border-width: 3px;
    }
    
    .hero-name {
        font-size: 1.75rem;
    }
    
    .hero-title {
        font-size: 1.5rem;
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
    }
    
    /* Sections */
    section {
        padding: var(--spacing-md) var(--container-padding);
    }
    
    /* Compétences */
    .skills-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    /* Façon de travailler */
    .work-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    /* Contact */
    .contact-form {
        padding: var(--spacing-md);
    }
    
    /* Footer */
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

/* ============================================
   Accessibilité
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Focus visible pour accessibilité clavier */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}