/* ===================================
   G360 DESIGN SYSTEM
   Palette: Parisian Tech Excellence
   Fonts: Inter (Google Fonts)
   =================================== */

/* ===== CSS VARIABLES ===== */
:root {
    /* Colors — Background */
    --bg-body: #0A0E1A;
    --bg-section: #151B2E;
    --bg-header: #0D1117;
    
    /* Colors — Text */
    --text-primary: #E8EDF4;
    --text-secondary: #A0AABF;
    --text-disabled: #6B7280;
    
    /* Colors — Accent */
    --color-primary: #3B82F6;
    --color-secondary: #C9A961;
    --color-tertiary: #60A5FA;
    
    /* Colors — Functional */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-link: #60A5FA;
    --color-link-hover: #C9A961;
    
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    
    /* Spacing (8px base) */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-2xl: 64px;
    --space-3xl: 96px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    /* Transitions */
    --transition-standard: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-body);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: #FFFFFF;
}

h1 {
    font-size: 48px;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

h2 {
    font-size: 36px;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: var(--space-md);
}

h3 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
}

h4 {
    font-size: 20px;
    font-weight: 500;
}

p {
    margin-bottom: var(--space-sm);
}

a {
    color: var(--color-link);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-link-hover);
    text-decoration-color: var(--color-link-hover);
}

strong {
    font-weight: 600;
}

/* ===== CONTAINER ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    font-family: var(--font-primary);
    font-size: 16px;
    font-weight: 600;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: var(--transition-standard);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--bg-body);
}

.btn-primary:hover {
    background-color: #2563EB;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-secondary);
    border: 2px solid var(--color-secondary);
    padding: 12px 28px;
}

.btn-secondary:hover {
    background-color: var(--color-secondary);
    color: var(--bg-body);
}

.btn-primary-header {
    background-color: var(--color-primary);
    color: var(--bg-body);
    padding: 10px 24px;
    font-size: 14px;
}

/* ===== HEADER ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--bg-header);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(12px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: #FFFFFF;
}

.nav {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

.nav-link.active {
    color: var(--color-secondary);
    border-bottom: 2px solid var(--color-secondary);
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
}

/* ===== HERO SECTION ===== */
.hero {
    padding: var(--space-3xl) 0;
    text-align: center;
}

.hero-title {
    margin-bottom: var(--space-md);
}

.hero-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--text-primary);
    max-width: 800px;
    margin: 0 auto var(--space-xl);
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== SECTIONS ===== */
section {
    padding: var(--space-2xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.section-intro {
    text-align: center;
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto var(--space-xl);
}

/* ===== PILLARS SECTION ===== */
.pillars {
    background-color: var(--bg-section);
}

.pillars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.pillar-card {
    background-color: var(--bg-body);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    text-align: center;
    text-decoration: none;
    transition: var(--transition-standard);
}

.pillar-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(59, 130, 246, 0.2);
}

.pillar-icon {
    width: 64px;
    height: 64px;
    margin-bottom: var(--space-md);
    filter: brightness(0) saturate(100%) invert(70%) sepia(12%) saturate(387%) hue-rotate(186deg) brightness(92%) contrast(88%);
    transition: filter 0.3s ease;
}

.pillar-card:hover .pillar-icon {
    filter: brightness(0) saturate(100%) invert(49%) sepia(96%) saturate(1676%) hue-rotate(200deg) brightness(101%) contrast(93%);
}

.pillar-title {
    font-size: 20px;
    margin-bottom: var(--space-sm);
    color: #FFFFFF;
}

.pillar-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===== WHY 360 SECTION ===== */
.why-360 {
    background-color: var(--bg-body);
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
}

.why-card {
    background-color: var(--bg-section);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    text-align: center;
}

.why-title {
    font-size: 20px;
    margin-bottom: var(--space-sm);
    color: var(--color-secondary);
}

.why-text {
    font-size: 16px;
    color: var(--text-secondary);
}

/* ===== WHY G360 SECTION ===== */
.why-g360 {
    background-color: var(--bg-section);
}

.expertise-content {
    margin-bottom: var(--space-xl);
}

.expertise-title {
    font-size: 24px;
    margin-bottom: var(--space-md);
    color: var(--color-primary);
}

.expertise-text {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
}

.expertise-footer {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.expertise-links {
    text-align: center;
    margin-top: var(--space-xl);
    font-size: 16px;
}

/* ===== FAQ SECTION ===== */
.faq {
    background-color: var(--bg-body);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
    gap: var(--space-md);
}

@media (max-width: 768px) {
    .faq-grid {
        grid-template-columns: 1fr;
    }
}

.faq-item {
    background-color: var(--bg-section);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
}

.faq-question {
    font-size: 18px;
    margin-bottom: var(--space-sm);
    color: var(--color-secondary);
}

.faq-answer {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* ===== FINAL CTA ===== */
.cta-final {
    background-color: var(--bg-section);
    text-align: center;
    padding: var(--space-3xl) 0;
}

.cta-title {
    margin-bottom: var(--space-md);
}

.cta-text {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--space-xl);
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--bg-header);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: var(--space-xl) 0 var(--space-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-xl);
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
    }
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-logo {
    height: 200px;
    width: 200px;
}

.footer-tagline {
    font-size: 14px;
    color: var(--text-secondary);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

@media (max-width: 768px) {
    .footer-links {
        grid-template-columns: 1fr;
    }
}

.footer-heading {
    font-size: 16px;
    font-weight: 600;
    color: #FFFFFF;
    margin-bottom: var(--space-sm);
}

.footer-list {
    list-style: none;
}

.footer-list li {
    margin-bottom: var(--space-xs);
}

.footer-list a {
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-list a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: var(--space-md);
}

.footer-copyright {
    text-align: center;
    font-size: 14px;
    color: var(--text-disabled);
}

/* ============================================
   AJOUTS POUR VIDÉO YOUTUBE CENTRÉE
   (Cas d'usage #06 - Production vidéo IA)
   ============================================ */

/* Wrapper global pour la vidéo */
.video-wrapper {
    margin: var(--space-2xl) 0;
}

/* Container pour centrer la vidéo */
.video-container {
    display: flex;
    justify-content: center;
    margin: 0 auto;
    max-width: 800px;
}

/* Iframe YouTube avec ombre */
.video-container iframe {
    width: 100%;
    max-width: 560px;
    height: 315px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* Légende sous la vidéo */
.video-caption {
    text-align: center;
    margin-top: var(--space-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-style: italic;
}

/* Responsive mobile pour la vidéo */
@media (max-width: 768px) {
    .video-container iframe {
        height: auto;
        aspect-ratio: 16 / 9;
    }
}

/* ============================================
   STYLES POUR CAS D'USAGES
   ============================================ */

/* Navigation cas précédent/suivant */
.case-navigation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin: var(--space-xl) 0;
}

.case-nav-card {
    background: var(--bg-section);
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.08));
    border-radius: 12px;
    padding: var(--space-lg);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.case-nav-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.case-nav-arrow {
    font-size: 2rem;
    color: var(--color-primary);
    flex-shrink: 0;
}

.case-nav-content h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.case-nav-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.case-nav-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

.case-nav-card.next {
    flex-direction: row-reverse;
}

/* Badge numéro de cas */
.case-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-tertiary, #60A5FA) 100%);
    color: #fff;
    padding: var(--space-xs) var(--space-md);
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: var(--space-md);
}

/* Fiche technique */
.case-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin: var(--space-lg) 0;
    padding: var(--space-lg);
    background: var(--bg-section);
    border-radius: 12px;
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.08));
}

.case-info-item h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.case-info-item p {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

/* ============================================
   STYLES POUR VIDÉO YOUTUBE
   (Cas d'usage #06 - Production vidéo IA)
   ============================================ */

/* Wrapper global pour la vidéo */
.video-wrapper {
    margin: var(--space-2xl) 0;
}

/* Container pour centrer la vidéo */
.video-container {
    display: flex;
    justify-content: center;
    margin: 0 auto;
    max-width: 800px;
}

/* Iframe YouTube avec ombre */
.video-container iframe {
    width: 100%;
    max-width: 560px;
    height: 315px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* Légende sous la vidéo */
.video-caption {
    text-align: center;
    margin-top: var(--space-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-style: italic;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    /* Navigation cas */
    .case-navigation {
        grid-template-columns: 1fr;
    }
    
    /* Vidéo YouTube responsive */
    .video-container iframe {
        height: auto;
        aspect-ratio: 16 / 9;
    }
}

/* ============================================
   STYLES POUR PAGE INDEX CAS D'USAGES
   ============================================ */

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.use-case-card {
    background: var(--bg-section);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.use-case-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(59, 130, 246, 0.2);
}

.use-case-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-tertiary, #60A5FA) 100%);
    color: #fff;
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
}

.use-case-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: var(--space-sm);
}

.use-case-meta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.use-case-meta span {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.use-case-description {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    flex-grow: 1;
}

.use-case-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-top: auto;
}

.use-case-tag {
    background: rgba(59, 130, 246, 0.1);
    color: var(--color-primary);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
}

@media (max-width: 768px) {
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   FORMULAIRE CONTACT ÉLÉGANT
   ============================================ */

.contact-form-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.contact-form-elegant {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(99, 102, 241, 0.05) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.3px;
}

.required {
    color: #ef4444;
    margin-left: 2px;
}

.form-group input,
.form-group select,
.form-group textarea {
    background: rgba(0, 0, 0, 0.3);
    border: 1.5px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    font-size: 1rem;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    transition: all 0.3s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    background: rgba(0, 0, 0, 0.4);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
    line-height: 1.6;
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='rgba(255,255,255,0.6)' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
    padding-right: 45px;
}

.form-required-note {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    font-style: italic;
}

.btn-submit {
    width: 100%;
    padding: 16px 32px;
    font-size: 1.05rem;
    font-weight: 600;
    position: relative;
    overflow: hidden;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
}

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

.form-message {
    display: none;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    gap: var(--space-md);
}

.form-message svg {
    width: 64px;
    height: 64px;
    margin-bottom: var(--space-sm);
}

.form-message h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.form-message p {
    font-size: 1rem;
    line-height: 1.6;
    margin: 0;
    max-width: 500px;
}

.form-message.success {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1) 0%, rgba(16, 185, 129, 0.1) 100%);
    border: 2px solid rgba(34, 197, 94, 0.3);
    color: #4ade80;
}

.form-message.success svg {
    stroke: #4ade80;
}

.form-message.error {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(220, 38, 38, 0.1) 100%);
    border: 2px solid rgba(239, 68, 68, 0.3);
    color: #f87171;
}

.form-message.error svg {
    stroke: #f87171;
}

.form-message a {
    color: inherit;
    text-decoration: underline;
    font-weight: 600;
}

.form-message a:hover {
    opacity: 0.8;
}

@media (max-width: 768px) {
    .contact-form-elegant {
        padding: var(--space-lg);
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
        margin-bottom: 0;
    }
    
    .form-group {
        margin-bottom: var(--space-md);
    }
    
    .form-message {
        padding: var(--space-lg);
    }
    
    .form-message svg {
        width: 48px;
        height: 48px;
    }
    
    .form-message h3 {
        font-size: 1.25rem;
    }
}

/* Notice reCAPTCHA */
.recaptcha-notice {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    line-height: 1.5;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.recaptcha-notice svg {
    flex-shrink: 0;
    margin-top: 2px;
    opacity: 0.6;
}

.recaptcha-notice a {
    color: var(--color-primary);
    text-decoration: none;
}

.recaptcha-notice a:hover {
    text-decoration: underline;
}