/* ============================================
   ZenFlow Landing Page - CSS Principal
   Design moderne, animations fluides, responsive
   ============================================ */

/* === Variables CSS === */
:root {
    /* Couleurs principales */
    --primary-blue: #0066FF;
    --primary-green: #00D4AA;
    --dark-blue: #0A1628;
    --light-bg: #F8FAFB;
    --white: #FFFFFF;
    
    /* Couleurs de texte */
    --text-primary: #1A1A1A;
    --text-secondary: #6B7280;
    --text-light: #9CA3AF;
    
    /* Couleurs système */
    --success: #10B981;
    --error: #EF4444;
    --warning: #F59E0B;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0066FF 0%, #00D4AA 100%);
    --gradient-soft: linear-gradient(180deg, rgba(0, 102, 255, 0.05) 0%, rgba(0, 212, 170, 0.05) 100%);
    
    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Espacements */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

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

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

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

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* === Typographie === */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

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

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

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.logo i {
    font-size: 1.8rem;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.btn-nav {
    padding: 0.75rem 1.5rem;
    background: var(--gradient-primary);
    color: var(--white) !important;
    border-radius: var(--radius-full);
    font-weight: 600;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-nav:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
}

/* === Hero Section === */
.hero {
    position: relative;
    padding: 140px 0 80px;
    background: var(--gradient-soft);
    overflow: hidden;
}

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

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(0, 102, 255, 0.1);
    color: var(--primary-blue);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

/* === Email Capture Form === */
.email-capture {
    margin-bottom: var(--spacing-xl);
}

.waitlist-form {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.input-group {
    position: relative;
    flex: 1;
}

.input-group i {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    font-size: 1.125rem;
}

.input-group input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid #E5E7EB;
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all var(--transition-base);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    white-space: nowrap;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-primary i {
    font-size: 1.125rem;
}

.form-note {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.form-note i {
    color: var(--success);
}

/* === Social Proof === */
.social-proof {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-md) 0;
}

.proof-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.proof-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.proof-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.proof-divider {
    width: 1px;
    height: 40px;
    background: #E5E7EB;
}

.proof-stars {
    display: flex;
    gap: 0.25rem;
    color: #FBBF24;
    font-size: 1.125rem;
}

/* === Hero Visual === */
.hero-visual {
    position: relative;
}

.dashboard-mockup {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
}

.dashboard-img {
    width: 100%;
    height: auto;
    border-radius: 1.5rem;
    box-shadow: var(--shadow-xl);
    display: block;
}

.floating-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    font-weight: 600;
    animation: float 3s ease-in-out infinite;
}

.floating-card i {
    font-size: 1.5rem;
    color: var(--primary-blue);
}

.card-1 {
    top: 10%;
    left: -10%;
    animation-delay: 0s;
}

.card-2 {
    top: 50%;
    right: -10%;
    animation-delay: 1s;
}

.card-3 {
    bottom: 15%;
    left: -15%;
    animation-delay: 2s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* === Scroll Indicator === */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

/* === Stats Bar === */
.stats-bar {
    background: var(--dark-blue);
    padding: var(--spacing-xl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    text-align: center;
}

.stat-item {
    color: var(--white);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-green);
    margin-bottom: 0.5rem;
}

.stat-number::after {
    content: '%';
}

.stat-item:last-child .stat-number::after {
    content: '';
}

.stat-label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.8);
}

/* === Problem Section === */
.problem-section {
    padding: var(--spacing-2xl) 0;
}

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

.section-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(0, 102, 255, 0.1);
    color: var(--primary-blue);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.problem-card {
    padding: var(--spacing-lg);
    background: var(--white);
    border: 2px solid #E5E7EB;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.problem-card:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.problem-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(239, 68, 68, 0.1);
    border-radius: var(--radius-md);
    color: var(--error);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.problem-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.problem-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.quote-block {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    background: var(--gradient-soft);
    border-left: 4px solid var(--primary-blue);
    border-radius: var(--radius-md);
    position: relative;
}

.quote-block i {
    font-size: 2rem;
    color: var(--primary-blue);
    opacity: 0.3;
    margin-bottom: var(--spacing-sm);
}

.quote-block blockquote {
    font-size: 1.125rem;
    font-style: italic;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

.quote-block cite {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-style: normal;
}

/* === Solution Section === */
.solution-section {
    padding: var(--spacing-2xl) 0;
    background: var(--light-bg);
}

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

.solution-intro {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.solution-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.feature-item {
    display: flex;
    gap: var(--spacing-md);
}

.feature-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(16, 185, 129, 0.1);
    border-radius: var(--radius-sm);
    color: var(--success);
    font-size: 1.25rem;
}

.feature-text h4 {
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.feature-text p {
    color: var(--text-secondary);
}

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

.comparison-card {
    padding: var(--spacing-lg);
    background: var(--white);
    border: 2px solid #E5E7EB;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.comparison-card.active {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-lg);
}

.comparison-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.comparison-header h3 {
    font-size: 1.25rem;
}

.badge-new {
    padding: 0.25rem 0.75rem;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.comparison-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.comparison-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9375rem;
}

.comparison-item i {
    font-size: 1.125rem;
}

.comparison-item.negative i {
    color: var(--error);
}

.comparison-item.positive i {
    color: var(--success);
}

/* === Features Section === */
.features-section {
    padding: var(--spacing-2xl) 0;
}

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

.feature-card {
    padding: var(--spacing-xl);
    background: var(--white);
    border: 2px solid #E5E7EB;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.feature-card-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-soft);
    border-radius: var(--radius-md);
    color: var(--primary-blue);
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* === CTA Section === */
.cta-section {
    padding: var(--spacing-2xl) 0;
    background: var(--dark-blue);
    color: var(--white);
    text-align: center;
}

.cta-title {
    font-size: 2.5rem;
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.cta-subtitle {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.cta-section .email-capture {
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.cta-benefits {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

.benefit-item i {
    color: var(--primary-green);
    font-size: 1.25rem;
}

/* === Footer === */
.footer {
    background: var(--dark-blue);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-brand .logo {
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.footer-tagline {
    font-size: 0.9375rem;
    line-height: 1.6;
}

.footer-column h4 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

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

.footer-column ul li {
    margin-bottom: 0.75rem;
}

.footer-column a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--white);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    color: var(--white);
    font-size: 1.125rem;
    transition: all var(--transition-base);
}

.footer-social a:hover {
    background: var(--primary-blue);
    transform: translateY(-2px);
}

/* === Modal === */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 100%;
    text-align: center;
    animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(16, 185, 129, 0.1);
    border-radius: var(--radius-full);
    color: var(--success);
    font-size: 3rem;
    margin: 0 auto var(--spacing-md);
}

.modal-content h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* === Responsive Design === */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-content,
    .solution-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .hero-visual {
        order: -1;
    }
    
    .problem-grid,
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

/* ── MOBILE MENU OPEN STATE ─────────────────────────────── */
.nav-links.open {
    display: flex !important;
    flex-direction: column;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1.5rem 1.25rem 2rem;
    gap: 0;
    z-index: 999;
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    border-bottom: 1px solid rgba(0,102,255,0.1);
    animation: slideDownMenu 0.25s ease;
}

.nav-links.open a {
    display: block;
    padding: 0.85rem 1rem;
    font-size: 1rem;
    font-weight: 600;
    border-bottom: 1px solid rgba(0,0,0,0.06);
    color: #1A1A1A;
    text-align: left;
    transition: background 0.15s;
}

.nav-links.open a:last-child {
    border-bottom: none;
}

.nav-links.open a:hover,
.nav-links.open a:active {
    background: rgba(0,102,255,0.06);
    border-radius: 8px;
    color: #0066FF;
}

.nav-links.open .btn-nav {
    margin-top: 1rem;
    text-align: center;
    border-radius: 12px;
    padding: 0.9rem 1rem;
}

@keyframes slideDownMenu {
    from { opacity: 0; transform: translateY(-10px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── MENU OVERLAY (close on bg tap) ─────────────────────── */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.35);
    z-index: 998;
}

.mobile-menu-overlay.visible {
    display: block;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .waitlist-form {
        flex-direction: column;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .problem-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard-mockup {
        max-width: 100%;
    }
    
    .floating-card {
        font-size: 0.75rem;
        padding: 0.75rem 1rem;
    }
    
    .card-1,
    .card-2,
    .card-3 {
        position: static;
        margin: var(--spacing-sm) 0;
    }
    
    .cta-title {
        font-size: 1.75rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

/* === Utilitaires === */
.text-center {
    text-align: center;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }