/* ========================================
   VARIABLES CSS
   ======================================== */
:root {
    /* Couleurs principales */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;
    
    /* Couleurs neutres */
    --color-dark: #0f172a;
    --color-dark-light: #1e293b;
    --color-gray: #475569;
    --color-gray-light: #64748b;
    --color-light: #f1f5f9;
    --color-white: #ffffff;
    
    /* Couleurs d'accent */
    --color-accent: #06b6d4;
    
    /* Typographie */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* Espacements */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Bordures */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Ombres */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Conteneurs */
    --container-width: 1200px;
    --container-narrow: 800px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-main);
    font-weight: var(--font-weight-normal);
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img, video {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: all var(--transition-fast);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul {
    list-style: none;
}

/* ========================================
   CONTENEURS
   ======================================== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

/* ========================================
   NAVIGATION
   ======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-normal);
}

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

.nav-brand {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.brand-name {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
}

.brand-subtitle {
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.nav-links a {
    font-size: 0.95rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-gray);
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-primary);
}

.nav-cta {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-primary);
    color: var(--color-white) !important;
    border-radius: var(--radius-lg);
    font-weight: var(--font-weight-semibold);
}

.nav-cta:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.375rem;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 1.5rem;
    height: 2px;
    background: var(--color-dark);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ========================================
   HERO SECTION
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-light) 100%);
    padding: var(--spacing-3xl) var(--spacing-lg);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(37, 99, 235, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.3);
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 900px;
    text-align: center;
    color: var(--color-white);
}

.hero-title {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.hero-title-main {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: var(--font-weight-extrabold);
    line-height: 1.1;
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title-sub {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: var(--font-weight-medium);
    color: var(--color-light);
    opacity: 0.9;
}

.hero-text {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-light);
    margin-bottom: var(--spacing-xl);
    opacity: 0.85;
}

.hero-contacts {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.hero-contact-item {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    font-size: 1.05rem;
    transition: all var(--transition-fast);
}

.hero-contact-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-xl);
    font-size: 1.05rem;
    font-weight: var(--font-weight-semibold);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

.hero-cta:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    overflow: hidden;
}

.scroll-line {
    width: 100%;
    height: 30%;
    background: var(--color-white);
    animation: scroll 2s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% { transform: translateY(-100%); }
    50% { transform: translateY(300%); }
}

/* ========================================
   SECTIONS
   ======================================== */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-light {
    background: var(--color-white);
}

.section-dark {
    background: linear-gradient(180deg, var(--color-light) 0%, #e2e8f0 100%);
}

.section-contact {
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-light) 100%);
    color: var(--color-white);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: var(--font-weight-extrabold);
    margin-bottom: var(--spacing-md);
    color: inherit;
}

.section-divider {
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
    margin: 0 auto;
    border-radius: 2px;
}

.section-intro {
    font-size: 1.15rem;
    color: var(--color-gray);
    margin-top: var(--spacing-md);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ========================================
   PRÉSENTATION
   ======================================== */
.presentation-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.presentation-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.content-subtitle {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    margin-bottom: var(--spacing-xs);
}

.text-content {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--color-gray);
}

.editable-zone {
    padding: var(--spacing-md);
    background: var(--color-light);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-sm);
    margin: var(--spacing-md) 0;
}

.presentation-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.presentation-video {
    display: flex;
    justify-content: center;
}

.video-container {
    position: relative;
    width: 100%;
    overflow: hidden;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    background: var(--color-dark);
}

.video-container video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-portrait {
    max-width: 450px;
    aspect-ratio: 9 / 16;
}

/* ========================================
   BOUTONS
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.95rem;
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-dark);
    border: 2px solid var(--color-light);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
}

/* ========================================
   EXPERTISES
   ======================================== */
.expertise-block {
    margin-bottom: var(--spacing-3xl);
}

.expertise-block:last-child {
    margin-bottom: 0;
}

.expertise-title {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.cards-grid {
    display: grid;
    gap: var(--spacing-lg);
}

.cards-grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

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

.card-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.card-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--color-white);
}

.card-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    margin-bottom: var(--spacing-xs);
}

.card-text {
    font-size: 1rem;
    color: var(--color-gray);
    line-height: 1.6;
}

.card-highlight {
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-light) 100%);
    border: 2px solid var(--color-primary);
}

.card-title-large {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
}

.list-checked {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.list-checked li {
    padding-left: 1.5rem;
    position: relative;
    font-size: 1rem;
    color: var(--color-gray);
    line-height: 1.6;
}

.list-checked li strong {
    display: inline;
    font-weight: var(--font-weight-semibold);
}

.list-checked li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
}

.card-note {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--color-light);
}

.card-note p {
    font-size: 0.95rem;
    color: var(--color-gray-light);
    font-style: italic;
}

/* IA Content */
.ia-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.video-title {
    font-size: 1.15rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

/* ========================================
   PÉDAGOGIE
   ======================================== */
.pedagogy-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

.pedagogy-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.pedagogy-item-reverse {
    direction: rtl;
}

.pedagogy-item-reverse > * {
    direction: ltr;
}

.pedagogy-image {
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.pedagogy-image img {
    width: 100%;
    height: auto;
    transition: transform var(--transition-slow);
}

.pedagogy-item:hover .pedagogy-image img {
    transform: scale(1.05);
}

.pedagogy-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.pedagogy-title {
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
}

.link-video {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
    margin-top: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.link-video:hover {
    color: var(--color-primary-dark);
    gap: var(--spacing-sm);
}

.pedagogy-highlight {
    text-align: center;
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-xl);
    color: var(--color-white);
}

.highlight-text {
    font-size: 1.35rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.highlight-text-small {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* ========================================
   CONTACT
   ======================================== */
.contact-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    transition: all var(--transition-normal);
}

.contact-card:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--color-primary);
    transform: translateY(-5px);
}

.contact-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    border-radius: var(--radius-lg);
}

.contact-icon svg {
    width: 32px;
    height: 32px;
    stroke: var(--color-white);
}

.contact-label {
    font-size: 0.9rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact-value {
    font-size: 1.15rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
}

.contact-note {
    text-align: center;
    font-size: 1.05rem;
    color: var(--color-light);
    opacity: 0.85;
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    background: var(--color-dark);
    padding: var(--spacing-lg) 0;
}

.footer-text {
    text-align: center;
    color: var(--color-gray-light);
    font-size: 0.95rem;
}

/* ========================================
   ICÔNES
   ======================================== */
.icon {
    width: 24px;
    height: 24px;
}

.icon-small {
    width: 18px;
    height: 18px;
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 1024px) {
    :root {
        --spacing-3xl: 4rem;
    }
    
    .presentation-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .ia-content {
        grid-template-columns: 1fr;
    }
    
    .pedagogy-item,
    .pedagogy-item-reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-2xl: 3rem;
        --spacing-3xl: 3rem;
    }
    
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        gap: 0;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        transition: transform var(--transition-normal);
    }
    
    .nav-links.active {
        transform: translateY(0);
    }
    
    .nav-links li {
        width: 100%;
    }
    
    .nav-links a {
        display: block;
        padding: var(--spacing-sm);
        text-align: center;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        min-height: 90vh;
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .hero-contacts {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .container,
    .container-narrow {
        padding: 0 var(--spacing-md);
    }
    
    .video-portrait {
        max-width: 350px;
    }
    
    .cards-grid-3 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title-main {
        font-size: 2rem;
    }
    
    .hero-title-sub {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .contact-cards {
        grid-template-columns: 1fr;
    }
}
/* ========================================
   STYLES ADDITIONNELS POUR MANIFESTE IA
   ======================================== */

.ia-manifesto {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.list-simple {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    list-style: none;
    margin-top: var(--spacing-sm);
}

.list-simple li {
    padding-left: var(--spacing-md);
    position: relative;
    font-size: 1rem;
    color: var(--color-gray);
    line-height: 1.7;
}

.list-simple li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
}

/* Lien sur les images de pédagogie */
.pedagogy-image a {
    display: block;
    cursor: pointer;
    transition: opacity 0.3s ease;
}

.pedagogy-image a:hover {
    opacity: 0.9;
}

.pedagogy-image a img {
    transition: transform 0.3s ease;
}

.pedagogy-image a:hover img {
    transform: scale(1.02);
}