:root {
            --bg-dark: #050505; /* Noir profond */
            --bg-surface: rgba(255, 255, 255, 0.03);
            --bg-surface-hover: rgba(255, 255, 255, 0.06);
            --border-color: rgba(255, 255, 255, 0.08);
            --border-highlight: rgba(255, 255, 255, 0.2);
            
            --text-main: #ffffff;
            --text-muted: #a1a1aa; /* Zinc 400 */
            
            /* Dégradés premium Linear/Stripe style */
            --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
            --accent-glow: rgba(168, 85, 247, 0.4);
            
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-full: 9999px;
            
            --transition-slow: all 0.7s cubic-bezier(0.16, 1, 0.3, 1);
            --transition-fast: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', sans-serif;
        }

        body {
            background-color: var(--bg-dark);
            color: var(--text-main);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        ::selection {
            background: rgba(168, 85, 247, 0.3);
            color: white;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        h1, h2, h3, h4 {
            font-weight: 700;
            letter-spacing: -0.04em; /* Look SaaS très moderne */
        }

        .text-gradient {
            background: var(--accent-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            color: transparent;
        }

        /* Effet de lueur d'arrière-plan (Ambient Glow) */
        .ambient-glow {
            position: absolute;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
            border-radius: 50%;
            filter: blur(80px);
            opacity: 0.5;
            z-index: -1;
            pointer-events: none;
        }

        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(5, 5, 5, 0.5);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            transition: var(--transition-fast);
        }

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

        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-main);
            display: flex;
            align-items: center;
            gap: 12px;
            letter-spacing: -0.05em;
        }

        .logo i {
            background: var(--accent-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        nav {
            display: flex;
            align-items: center;
            gap: 40px;
        }

        nav a {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition-fast);
        }

        nav a:hover {
            color: var(--text-main);
        }

        .btn-premium {
            position: relative;
            background: var(--bg-surface);
            color: var(--text-main);
            padding: 12px 28px;
            border-radius: var(--radius-full);
            text-decoration: none;
            font-weight: 500;
            font-size: 0.95rem;
            border: 1px solid var(--border-highlight);
            overflow: hidden;
            transition: var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: 10px;
            cursor: pointer;
        }

        .btn-premium::before {
            content: '';
            position: absolute;
            top: 0; left: 0; width: 100%; height: 100%;
            background: var(--accent-gradient);
            opacity: 0;
            transition: var(--transition-fast);
            z-index: -1;
        }

        .btn-premium:hover {
            border-color: transparent;
            box-shadow: 0 0 20px var(--accent-glow);
            transform: translateY(-2px);
        }

        .btn-premium:hover::before {
            opacity: 1;
        }

        .hero {
            position: relative;
            padding: 200px 0 120px;
            min-height: 100vh;
            display: flex;
            align-items: center;
            overflow: hidden;
        }

        .hero-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 80px;
            position: relative;
            z-index: 1;
        }

        .hero-text {
            flex: 1;
        }

        .badge {
            display: inline-block;
            padding: 6px 16px;
            background: var(--bg-surface);
            border: 1px solid var(--border-highlight);
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--text-muted);
            margin-bottom: 30px;
            box-shadow: inset 0 0 20px rgba(255,255,255,0.02);
        }

        .badge span {
            color: #ec4899;
            margin-right: 8px;
        }

        .hero h1 {
            font-size: 4.5rem;
            line-height: 1.05;
            margin-bottom: 24px;
        }

        .hero p {
            font-size: 1.25rem;
            color: var(--text-muted);
            margin-bottom: 40px;
            max-width: 90%;
            font-weight: 400;
        }

        .hero-cta {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .hero-mockup {
            flex: 1;
            display: flex;
            justify-content: center;
            position: relative;
            perspective: 1000px;
        }

        .phone-frame {
            width: 340px;
            height: 700px;
            background: #000;
            border-radius: 50px;
            padding: 12px;
            border: 1px solid rgba(255,255,255,0.15);
            box-shadow: 
                0 0 0 2px #111,
                0 0 0 4px #333,
                0 30px 60px -10px rgba(0,0,0,0.8),
                0 0 80px rgba(168, 85, 247, 0.15);
            position: relative;
            transform: rotateY(-15deg) rotateX(5deg);
            transition: transform 0.5s ease;
        }

        .phone-frame:hover {
            transform: rotateY(-5deg) rotateX(2deg) translateY(-10px);
        }

        .phone-screen {
            width: 100%;
            height: 100%;
            background: #09090b; /* Zinc 950 */
            border-radius: 38px;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            position: relative;
        }

        .dynamic-island {
            position: absolute;
            top: 12px;
            left: 50%;
            transform: translateX(-50%);
            width: 120px;
            height: 35px;
            background: #000;
            border-radius: 20px;
            z-index: 10;
        }

        .app-status {
            display: flex;
            justify-content: space-between;
            padding: 20px 24px 10px;
            font-size: 0.8rem;
            font-weight: 600;
            color: #fff;
            position: relative;
            z-index: 5;
        }

        .app-ui {
            padding: 30px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .app-header {
            margin-bottom: 10px;
            margin-top: 20px;
        }

        .app-header h3 {
            font-size: 1.5rem;
            font-weight: 600;
            letter-spacing: -0.03em;
        }

        .app-header p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin: 0;
        }

        .app-card {
            background: rgba(255,255,255,0.05);
            border: 1px solid rgba(255,255,255,0.05);
            padding: 16px;
            border-radius: 20px;
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .app-card.gradient-border {
            position: relative;
            background: #09090b;
        }
        
        .app-card.gradient-border::before {
            content: "";
            position: absolute;
            inset: -1px;
            border-radius: 21px;
            padding: 1px;
            background: var(--accent-gradient);
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            z-index: -1;
        }

        .app-icon {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            background: rgba(255,255,255,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: #fff;
        }

        .app-icon.accent {
            background: rgba(168, 85, 247, 0.2);
            color: #d8b4fe;
        }

        .app-card-text strong {
            display: block;
            font-size: 0.95rem;
        }
        
        .app-card-text span {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .app-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }

        .app-mini-card {
            background: rgba(255,255,255,0.03);
            border: 1px solid rgba(255,255,255,0.05);
            padding: 16px;
            border-radius: 16px;
            text-align: center;
        }

        .app-mini-card i {
            font-size: 1.5rem;
            color: var(--text-muted);
            margin-bottom: 8px;
        }

        .section-header {
            text-align: center;
            margin-bottom: 80px;
        }

        .section-header h2 {
            font-size: 3rem;
            margin-bottom: 16px;
        }

        .section-header p {
            font-size: 1.2rem;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
        }

        .features {
            padding: 120px 0;
            position: relative;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .feature-card {
            background: var(--bg-surface);
            border: 1px solid var(--border-color);
            padding: 40px;
            border-radius: var(--radius-lg);
            transition: var(--transition-slow);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0; left: 0; width: 100%; height: 100%;
            background: radial-gradient(800px circle at var(--mouse-x) var(--mouse-y), rgba(255,255,255,0.06), transparent 40%);
            opacity: 0;
            transition: opacity 0.5s;
            z-index: 0;
            pointer-events: none;
        }

        .feature-card:hover {
            border-color: var(--border-highlight);
            transform: translateY(-5px);
            background: var(--bg-surface-hover);
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-content {
            position: relative;
            z-index: 1;
        }

        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: rgba(255,255,255,0.05);
            border: 1px solid rgba(255,255,255,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: #fff;
            margin-bottom: 24px;
        }

        .feature-card h3 {
            font-size: 1.3rem;
            margin-bottom: 12px;
        }

        .feature-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .roadmap {
            padding: 120px 0;
            background: rgba(255,255,255,0.01);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .timeline {
            max-width: 800px;
            margin: 0 auto;
            position: relative;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            top: 0;
            bottom: 0;
            width: 1px;
            background: linear-gradient(to bottom, transparent, var(--border-highlight), transparent);
        }

        .timeline-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 60px;
            position: relative;
            width: 100%;
        }

        .timeline-item:nth-child(even) {
            flex-direction: row-reverse;
        }

        .timeline-dot {
            width: 16px;
            height: 16px;
            background: var(--bg-dark);
            border: 2px solid #a855f7;
            border-radius: 50%;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            box-shadow: 0 0 15px rgba(168, 85, 247, 0.5);
            z-index: 2;
        }

        .timeline-item.past .timeline-dot {
            border-color: #6366f1;
            box-shadow: 0 0 15px rgba(99, 102, 241, 0.5);
            background: #6366f1;
        }

        .timeline-content {
            width: 45%;
            background: var(--bg-surface);
            padding: 30px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
        }

        .timeline-content h4 {
            font-size: 0.85rem;
            color: #a855f7;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            margin-bottom: 8px;
        }

        .timeline-content h3 {
            font-size: 1.25rem;
            margin-bottom: 12px;
        }

        .timeline-content p {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        .faq {
            padding: 120px 0;
        }

        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-color);
        }

        .faq-question {
            width: 100%;
            text-align: left;
            background: none;
            border: none;
            padding: 24px 0;
            font-size: 1.1rem;
            font-weight: 500;
            color: var(--text-main);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-question i {
            transition: transform 0.3s ease;
            color: var(--text-muted);
        }

        .faq-question.active i {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .faq-answer p {
            padding-bottom: 24px;
            color: var(--text-muted);
        }

        .waitlist {
            padding: 150px 0;
            text-align: center;
            position: relative;
        }

        .waitlist-container {
            max-width: 600px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .waitlist .ambient-glow {
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: radial-gradient(circle, rgba(99, 102, 241, 0.3) 0%, transparent 60%);
        }

        .waitlist h2 {
            font-size: 3.5rem;
            margin-bottom: 24px;
        }

        .waitlist p {
            font-size: 1.1rem;
            color: var(--text-muted);
            margin-bottom: 40px;
        }

        .form-group {
            display: flex;
            gap: 12px;
            background: rgba(255,255,255,0.03);
            padding: 8px;
            border-radius: var(--radius-full);
            border: 1px solid var(--border-highlight);
            position: relative;
            backdrop-filter: blur(10px);
            transition: var(--transition-fast);
        }

        .form-group:focus-within {
            border-color: rgba(168, 85, 247, 0.5);
            box-shadow: 0 0 20px rgba(168, 85, 247, 0.1);
        }

        .form-group input {
            flex: 1;
            background: transparent;
            border: none;
            padding: 0 24px;
            color: white;
            font-size: 1rem;
            outline: none;
        }

        .form-group input::placeholder {
            color: #52525b; /* Zinc 600 */
        }

        .btn-submit {
            background: var(--text-main);
            color: var(--bg-dark);
            border: none;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition-fast);
        }

        .btn-submit:hover {
            transform: scale(1.02);
            background: #e4e4e7;
        }

        #waitlist-success {
            display: none;
            margin-top: 24px;
            padding: 16px;
            background: rgba(16, 185, 129, 0.1);
            border: 1px solid rgba(16, 185, 129, 0.2);
            color: #34d399;
            border-radius: var(--radius-md);
            font-weight: 500;
        }

        footer {
            border-top: 1px solid var(--border-color);
            padding: 60px 0 40px;
            text-align: center;
        }

        .footer-logo {
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 20px;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 30px;
            margin-bottom: 40px;
        }

        .footer-links a {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 0.9rem;
            transition: var(--transition-fast);
        }

        .footer-links a:hover {
            color: var(--text-main);
        }

        .footer-copy {
            color: #52525b;
            font-size: 0.85rem;
        }

        .reveal {
            opacity: 0;
            transform: translateY(40px);
            transition: all 1s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .reveal.active {
            opacity: 1;
            transform: translateY(0);
        }

        .delay-100 { transition-delay: 100ms; }
        .delay-200 { transition-delay: 200ms; }
        .delay-300 { transition-delay: 300ms; }

        @media (max-width: 992px) {
            .hero-container { flex-direction: column; text-align: center; }
            .hero-text { margin-bottom: 60px; }
            .hero h1 { font-size: 3.5rem; }
            .hero p { margin: 0 auto 40px; }
            .hero-cta { justify-content: center; }
            .ambient-glow { top: 0; left: 50%; transform: translateX(-50%); }
            
            .timeline::before { left: 0; }
            .timeline-dot { left: 0; transform: translateX(-50%); }
            .timeline-item, .timeline-item:nth-child(even) { flex-direction: column; align-items: flex-start; padding-left: 40px; }
            .timeline-content { width: 100%; }
        }

        @media (max-width: 768px) {
            nav { display: none; }
            .hero h1 { font-size: 2.8rem; }
            .form-group { flex-direction: column; background: transparent; border: none; padding: 0; gap: 16px; }
            .form-group input { background: rgba(255,255,255,0.03); border: 1px solid var(--border-highlight); border-radius: var(--radius-full); padding: 16px 24px; }
        }