/* ==========================================
   VARIABLES & RESET
   ========================================== */

:root {
    /* Colors - Dark theme */
    --bg-white: #000000;
    --bg-gray: #000000;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-tertiary: #999999;
    --accent-blue: #007AFF;
    --border-light: rgba(255, 255, 255, 0.1);

    /* Dark Shadow System (multicouches) */
    --shadow-card:
        0px 0px 0px 1px rgba(255, 255, 255, 0.1),
        0px 1px 1px 0.5px rgba(255, 255, 255, 0.05),
        0px 3px 3px 1.5px rgba(255, 255, 255, 0.05),
        0px 6px 6px -3px rgba(255, 255, 255, 0.05),
        0px 12px 12px -6px rgba(255, 255, 255, 0.05),
        0px 24px 24px -12px rgba(255, 255, 255, 0.05);

    /* Border Radius */
    --radius-card: 12px;
    --radius-avatar: 999px;
    --radius-button: 8px;

    /* Spacing */
    --spacing-section: 120px;
    --spacing-section-mobile: 80px;
    --max-width: 1000px;

    /* Transitions */
    --transition: all 0.2s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ==========================================
   NAVIGATION - VERSION OPTIMALE
   ========================================== */

.nav {
    position: sticky;
    top: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    position: relative;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: inherit;
}

.logo-image {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.logo-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-links {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 32px;
}

.nav-spacer {
    width: 120px;
}

.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

/* ==========================================
   HERO SECTION
   ========================================== */

.hero {
    padding: 80px 24px 120px;
    background: var(--bg-white);
    text-align: center;
}

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

.hero-title {
    font-size: 60px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.hero-subtitle {
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.hero-cta {
    display: inline-block;
    background: var(--accent-blue);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    margin-top: 16px;
}

.hero-cta:hover {
    background: #0056b3;
    transform: translateY(-2px);
}

.hero-video {
    width: 100%;
    margin-top: 0;
    overflow: hidden;
}

.hero-video video {
    width: 100%;
    height: auto;
    display: block;
    max-width: 100%;
}

/* ==========================================
   NEW SECTIONS FOR HEC
   ========================================== */

/* Problem/Solution Section */
.problem-section {
    padding: var(--spacing-section) 0;
    background: var(--bg-white);
}

.problem-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    text-align: center;
}

.problem-stats {
    margin-bottom: 40px;
}

.stat-highlight {
    display: inline-block;
    background: var(--accent-blue);
    color: white;
    padding: 20px 40px;
    border-radius: 12px;
    margin-bottom: 32px;
}

.stat-highlight .stat-number {
    font-size: 48px;
    font-weight: 800;
    display: block;
    margin-bottom: 8px;
}

.stat-highlight .stat-text {
    font-size: 18px;
    font-weight: 500;
}

.problem-description {
    font-size: 20px;
    line-height: 1.6;
    color: var(--text-primary);
    max-width: 800px;
    margin: 0 auto;
}

/* Technical Traction Section */
.tech-section {
    padding: var(--spacing-section) 0;
    background: var(--bg-gray);
}

.tech-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.tech-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.metric-card {
    background: var(--bg-white);
    padding: 32px 24px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-light);
}

.metric-number {
    font-size: 36px;
    font-weight: 800;
    color: var(--accent-blue);
    display: block;
    margin-bottom: 8px;
}

.metric-label {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    display: block;
    margin-bottom: 8px;
}

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

/* Validation Section */
.validation-section {
    padding: var(--spacing-section) 0;
    background: var(--bg-white);
}

.validation-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.validation-content {
    margin-top: 40px;
}

.validation-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
    margin-bottom: 40px;
}

.validation-stat {
    text-align: center;
    padding: 24px;
    background: var(--bg-gray);
    border-radius: 12px;
    border: 1px solid var(--border-light);
}

.validation-number {
    font-size: 32px;
    font-weight: 800;
    color: var(--accent-blue);
    display: block;
    margin-bottom: 8px;
}

.validation-text {
    font-size: 16px;
    color: var(--text-primary);
    font-weight: 500;
}

.validation-note {
    background: var(--bg-gray);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-light);
    max-width: 600px;
    margin: 0 auto;
}

.validation-note p {
    margin-bottom: 8px;
    color: var(--text-primary);
}

/* Business Model Section */
.business-section {
    padding: var(--spacing-section) 0;
    background: var(--bg-gray);
}

.business-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.business-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    margin-top: 40px;
    align-items: start;
}

.business-model h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.model-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.model-tier {
    background: var(--bg-white);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-light);
}

.model-tier h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.model-tier ul {
    list-style: none;
    padding: 0;
}

.model-tier li {
    padding: 8px 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-light);
}

.model-tier li:last-child {
    border-bottom: none;
}

.market-info h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.market-stats {
    text-align: center;
    background: var(--bg-white);
    padding: 32px;
    border-radius: 12px;
    border: 1px solid var(--border-light);
}

.market-size {
    font-size: 36px;
    font-weight: 800;
    color: var(--accent-blue);
    display: block;
    margin-bottom: 8px;
}

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

/* Roadmap Section */
.roadmap-section {
    padding: var(--spacing-section) 0;
    background: var(--bg-white);
}

.roadmap-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.roadmap-timeline {
    margin-top: 40px;
    display: flex;
    gap: 48px;
    justify-content: center;
}

.timeline-phase {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    max-width: 400px;
}

.phase-number {
    background: var(--accent-blue);
    color: white;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    flex-shrink: 0;
}

.phase-content h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.phase-duration {
    font-size: 14px;
    color: var(--accent-blue);
    font-weight: 600;
    margin-bottom: 16px;
    display: block;
}

.phase-content ul {
    list-style: none;
    padding: 0;
}

.phase-content li {
    padding: 8px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 20px;
}

.phase-content li:before {
    content: "•";
    color: var(--accent-blue);
    position: absolute;
    left: 0;
}

/* ==========================================
   STORY SECTION
   ========================================== */

.story {
    padding: 0 0 var(--spacing-section) 0;
    background: var(--bg-white);
}

.story-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.story-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: left;
}

.story-content p {
    font-size: 20px;
    line-height: 1.8;
    color: #818085;
    /* Gris par défaut */
    margin-bottom: 32px;
    font-weight: 600;
    transition: color 0.3s ease;
}

.story-content p:last-child {
    margin-bottom: 0;
}

/* ==========================================
   ANIMATED EMOJIS
   ========================================== */

.animated-emoji {
    display: inline-block;
    font-size: 1.2em;
    margin: 0 4px;
}


.story-emoji {
    display: inline-block;
    width: 28px;
    height: 28px;
    margin: 0 4px;
    vertical-align: middle;
    filter: grayscale(100%);
    /* Gris par défaut */
    transition: filter 0.3s ease;
}

.animated-emoji.sparkle {
    animation: sparkle 2s ease-in-out infinite;
}

.animated-emoji.files {
    animation: files 3s ease-in-out infinite;
}

.animated-emoji.lock {
    animation: lock 2.5s ease-in-out infinite;
}

@keyframes sparkle {

    0%,
    100% {
        transform: scale(1) rotate(0deg);
        opacity: 1;
    }

    25% {
        transform: scale(1.1) rotate(90deg);
        opacity: 0.8;
    }

    50% {
        transform: scale(1.2) rotate(180deg);
        opacity: 1;
    }

    75% {
        transform: scale(1.1) rotate(270deg);
        opacity: 0.8;
    }
}

@keyframes files {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    25% {
        transform: translateY(-2px) rotate(-5deg);
    }

    50% {
        transform: translateY(-4px) rotate(0deg);
    }

    75% {
        transform: translateY(-2px) rotate(5deg);
    }
}

@keyframes lock {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

/* ==========================================
   FEATURES SECTION
   ========================================== */

.features {
    padding: var(--spacing-section) 0;
    background: var(--bg-gray);
}

.features-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--bg-white);
    padding: 32px;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow:
        0px 0px 0px 1px rgba(255, 255, 255, 0.15),
        0px 2px 2px 1px rgba(255, 255, 255, 0.08),
        0px 6px 6px 3px rgba(255, 255, 255, 0.08),
        0px 12px 12px -6px rgba(255, 255, 255, 0.08),
        0px 24px 24px -12px rgba(255, 255, 255, 0.08),
        0px 48px 48px -24px rgba(255, 255, 255, 0.08);
}

.feature-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

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

/* ==========================================
   VALIDATION SECTION
   ========================================== */

.validation {
    padding: var(--spacing-section) 0;
    background: var(--bg-white);
}

.validation-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.testimonial-card {
    background: var(--bg-gray);
    padding: 32px;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-2px);
}

.testimonial-header {
    margin-bottom: 16px;
}

.testimonial-source {
    font-size: 12px;
    font-weight: 500;
    color: var(--accent-blue);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.testimonial-text {
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    margin-bottom: 20px;
    font-style: italic;
}

.testimonial-author {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ==========================================
   STATS SECTION
   ========================================== */

.stats {
    padding: var(--spacing-section) 0;
    background: var(--bg-gray);
}

.stats-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 48px;
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 48px;
    font-weight: 800;
    color: var(--accent-blue);
    margin-bottom: 8px;
    line-height: 1;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ==========================================
   FOOTER
   ========================================== */

.footer {
    padding: 60px 0 40px;
    background: var(--bg-white);
    border-top: 1px solid var(--border-light);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    position: relative;
    align-items: center;
    margin-bottom: 32px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: var(--accent-blue);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 16px;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-light);
}

.footer-copyright {
    font-size: 12px;
    color: var(--text-tertiary);
}

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

@media (max-width: 768px) {
    .hero-title {
        font-size: 40px;
        white-space: normal;
    }

    .hero-subtitle {
        font-size: 14px;
    }

    .nav-links {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        gap: 24px;
    }

    .nav-link {
        font-size: 13px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    .stats-container {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-container {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 60px 16px 80px;
    }

    .nav-container {
        padding: 16px;
    }

    .nav-links {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        gap: 16px;
    }

    .story-content p {
        font-size: 18px;
    }

    .feature-card,
    .testimonial-card {
        padding: 24px;
    }

    /* Responsive for new sections */
    .business-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .model-features {
        grid-template-columns: 1fr;
    }

    .roadmap-timeline {
        flex-direction: column;
        gap: 32px;
    }

    .tech-metrics {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 16px;
    }

    .validation-stats {
        grid-template-columns: 1fr;
        gap: 16px;
    }
}