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

:root {
    /* Palette BrableLearn basée sur l'image de référence */
    --primary-blue: #1e40af;        /* Bleu foncé principal */
    --secondary-blue: #3b82f6;      /* Bleu moyen */
    --light-blue: #60a5fa;          /* Bleu clair */
    --accent-blue: #93c5fd;         /* Bleu très clair */
    --cream: #fef3c7;               /* Crème/beige des yeux de la mascotte */
    --dark-blue: #1e3a8a;          /* Bleu très foncé */
    
    /* Couleurs système */
    --background: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --border-color: #e5e7eb;
    --card-bg: #ffffff;
    --shadow: 0 4px 6px -1px rgba(30, 64, 175, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(30, 64, 175, 0.15);
    --radius: 0.5rem;
    --radius-lg: 1rem;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-blue);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link.cta-button {
    background: var(--secondary-blue);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    transition: all 0.3s ease;
}

.nav-link.cta-button:hover {
    background: var(--primary-blue);
    color: white;
    transform: translateY(-1px);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 0.25rem;
}

.hamburger span {
    width: 1.5rem;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    padding: 8rem 2rem 4rem;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.05);
    z-index: 1;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.highlight {
    background: linear-gradient(135deg, var(--light-blue), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 0;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-primary {
    background: var(--light-blue);
    color: white;
}

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

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn.large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.btn-outline {
    background: transparent;
    color: var(--secondary-blue);
    border: 2px solid var(--secondary-blue);
}

.btn-outline:hover {
    background: var(--secondary-blue);
    color: white;
}

.play-icon {
    width: 1rem;
    height: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* App Mockup */
.app-mockup {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-screen {
    width: 300px;
    height: 500px;
    object-fit: cover;
    border-radius: 2rem;
    box-shadow: 0 20px 40px rgba(30, 64, 175, 0.3);
    position: relative;
    z-index: 2;
}

.floating-card {
    position: absolute;
    background: white;
    border-radius: var(--radius);
    padding: 1rem;
    box-shadow: 0 10px 30px rgba(30, 64, 175, 0.2);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
    animation: float 6s ease-in-out infinite;
    border: 1px solid var(--accent-blue);
}

.card-1 {
    top: 10%;
    left: -20%;
    animation-delay: 0s;
}

.card-2 {
    bottom: 30%;
    right: -25%;
    animation-delay: 2s;
}

.card-3 {
    top: 60%;
    left: -25%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.card-icon {
    font-size: 1.5rem;
}

.card-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--primary-blue);
}

.card-progress {
    font-size: 0.75rem;
    color: var(--secondary-blue);
}

/* Countdown Section */
.countdown-section {
    padding: 4rem 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.countdown-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="countdown-pattern" width="50" height="50" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(59,130,246,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23countdown-pattern)"/></svg>');
    opacity: 0.7;
}

.countdown-container {
    text-align: center;
    position: relative;
    z-index: 2;
}

.countdown-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, var(--secondary-blue), var(--light-blue));
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 2rem;
    font-weight: 600;
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { 
        box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
        transform: scale(1);
    }
    50% { 
        box-shadow: 0 15px 40px rgba(59, 130, 246, 0.4);
        transform: scale(1.05);
    }
}

.badge-icon {
    font-size: 1.2rem;
    animation: rocket-float 3s ease-in-out infinite;
}

@keyframes rocket-float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-3px) rotate(2deg); }
    75% { transform: translateY(3px) rotate(-2deg); }
}

.countdown-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-blue);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.countdown-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.countdown-timer {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.timer-unit {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem 1rem;
    box-shadow: 0 15px 35px rgba(30, 64, 175, 0.1);
    border: 2px solid var(--accent-blue);
    position: relative;
    overflow: hidden;
    min-width: 120px;
    transition: all 0.3s ease;
}

.timer-unit::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
    transition: left 0.5s;
}

.timer-unit:hover::before {
    left: 100%;
}

.timer-unit:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 45px rgba(30, 64, 175, 0.15);
    border-color: var(--secondary-blue);
}

.timer-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-blue);
    line-height: 1;
    margin-bottom: 0.5rem;
    font-family: 'Inter', monospace;
    position: relative;
    z-index: 2;
    animation: number-flip 1s ease-in-out;
}

@keyframes number-flip {
    0% { transform: rotateY(0deg); }
    50% { transform: rotateY(180deg); }
    100% { transform: rotateY(360deg); }
}

.timer-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    z-index: 2;
}

.timer-separator {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--secondary-blue);
    animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
    0%, 50%, 100% { opacity: 1; }
    25%, 75% { opacity: 0.3; }
}

.countdown-cta {
    text-align: center;
}

.countdown-btn {
    background: linear-gradient(135deg, var(--secondary-blue), var(--light-blue));
    margin-bottom: 1rem;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.countdown-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.countdown-btn:hover::before {
    left: 100%;
}

.countdown-btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 20px 40px rgba(59, 130, 246, 0.3);
}

/* Sections communes */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

/* Features Section */
.features {
    padding: 6rem 0;
    background: #f8fafc;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(30, 64, 175, 0.1);
    border-color: var(--accent-blue);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--primary-blue);
}

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

/* Statistics Section */
.statistics {
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.statistics::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="rgba(147,197,253,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.8;
}

.statistics .container {
    position: relative;
    z-index: 2;
}

.statistics .section-header h2 {
    color: white;
}

.statistics .section-header p {
    color: rgba(255, 255, 255, 0.8);
}

.stats-container {
    display: grid;
    gap: 4rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.stat-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(147, 197, 253, 0.2);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(147, 197, 253, 0.2), transparent);
    transition: left 0.5s;
}

.stat-card:hover::before {
    left: 100%;
}

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

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.stat-big-number {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--cream);
    line-height: 1;
    display: inline-block;
}

.stat-unit {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--cream);
    margin-left: 0.25rem;
}

.stat-description {
    font-size: 1rem;
    margin-top: 1rem;
    opacity: 0.9;
    line-height: 1.4;
}

.stats-insights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.insight-card {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(147, 197, 253, 0.15);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all 0.3s ease;
}

.insight-card:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-3px);
    border-color: var(--accent-blue);
}

.insight-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: white;
}

.insight-card p {
    opacity: 0.9;
    line-height: 1.6;
}

/* How It Works Section */
.how-it-works {
    padding: 6rem 0;
    background: #f8fafc;
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.step-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
    position: relative;
    overflow: hidden;
}

.step-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-blue), var(--light-blue));
    transform: scaleX(0);
    transition: transform 0.3s ease;
    transform-origin: left;
}

.step-card:hover::before {
    transform: scaleX(1);
}

.step-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 25px 50px rgba(30, 64, 175, 0.15);
    border-color: var(--accent-blue);
}

.step-number {
    display: inline-block;
    width: 3rem;
    height: 3rem;
    line-height: 3rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--secondary-blue), var(--light-blue));
    color: white;
    font-weight: 800;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.step-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: block;
}

.step-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--primary-blue);
}

.step-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.step-features {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.feature-tag {
    background: rgba(59, 130, 246, 0.1);
    color: var(--secondary-blue);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.learning-paths {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.path-card {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: white;
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.path-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="dots" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23dots)"/></svg>');
}

.path-card .path-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
    position: relative;
    z-index: 2;
}

.path-card h4 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    position: relative;
    z-index: 2;
}

.path-card p {
    opacity: 0.9;
    line-height: 1.6;
    position: relative;
    z-index: 2;
    font-size: 0.95rem;
}

/* CTA Section */
.cta-section {
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--secondary-blue), var(--primary-blue));
    color: white;
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.app-badges {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.app-badge {
    height: 60px;
    transition: transform 0.3s ease;
    border-radius: 8px;
}

.app-badge:hover {
    transform: scale(1.05);
}

/* Footer */
.footer {
    padding: 4rem 0 2rem;
    background: var(--dark-blue);
    color: white;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--cream);
}

.footer-section h4 {
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--accent-blue);
}

.footer-section p {
    color: #cbd5e1;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--accent-blue);
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    font-size: 1.5rem;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.social-links a:hover {
    transform: scale(1.2);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(147, 197, 253, 0.2);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: #cbd5e1;
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--accent-blue);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .app-mockup {
        order: -1;
    }
    
    .floating-card {
        position: relative;
        display: none;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }

    .stats-insights {
        grid-template-columns: 1fr;
    }

    .learning-paths {
        grid-template-columns: 1fr;
    }

    .steps-container {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }

    .countdown-timer {
        gap: 0.5rem;
    }
    
    .timer-unit {
        min-width: 100px;
        padding: 1rem 0.75rem;
    }
    
    .countdown-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hero {
        padding: 6rem 1rem 3rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1.125rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .app-screen {
        width: 250px;
        height: 400px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .stat-big-number {
        font-size: 2.5rem;
    }

    .insight-card {
        padding: 1.5rem;
    }

    .steps-container {
        grid-template-columns: 1fr;
    }

    .step-card {
        padding: 2rem;
    }

    .learning-paths {
        grid-template-columns: 1fr;
    }

    .countdown-section {
        padding: 3rem 0;
    }

    .countdown-timer {
        flex-direction: column;
        gap: 1rem;
    }

    .timer-unit {
        min-width: 150px;
    }

    .timer-separator {
        display: none;
    }

    .countdown-title {
        font-size: 1.75rem;
    }

    .timer-number {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }
    
    .app-screen {
        width: 200px;
        height: 350px;
    }

    .stat-big-number {
        font-size: 2rem;
    }

    .stat-card {
        padding: 1.5rem;
    }

    .step-card {
        padding: 1.5rem;
    }

    .path-card {
        padding: 2rem;
    }

    .countdown-title {
        font-size: 1.5rem;
    }

    .timer-number {
        font-size: 2rem;
    }

    .timer-unit {
        min-width: 120px;
        padding: 1rem 0.5rem;
    }
}

/* Animations et transitions */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes stepReveal {
    0% {
        opacity: 0;
        transform: translateY(30px) scale(0.9);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.hero-content > * {
    animation: fadeInUp 0.8s ease-out forwards;
}

.hero-title {
    animation-delay: 0.2s;
}

.hero-description {
    animation-delay: 0.4s;
}

.hero-buttons {
    animation-delay: 0.6s;
}

.stat-big-number {
    animation: countUp 0.8s ease-out forwards;
}

.step-card {
    animation: stepReveal 0.6s ease-out forwards;
}

.step-card:nth-child(1) { animation-delay: 0.1s; }
.step-card:nth-child(2) { animation-delay: 0.2s; }
.step-card:nth-child(3) { animation-delay: 0.3s; }
.step-card:nth-child(4) { animation-delay: 0.4s; }

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}

/* Focus states pour l'accessibilité */
.btn:focus,
.nav-link:focus {
    outline: 2px solid var(--light-blue);
    outline-offset: 2px;
}

/* Transitions globales */
* {
    transition: color 0.3s ease, background-color 0.3s ease, border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

/* Effet de lueur pour les éléments importants */
.btn-primary:hover,
.stat-card:hover,
.step-card:hover {
    box-shadow: 0 0 30px rgba(59, 130, 246, 0.3);
}

/* Animation de particules pour la mascotte (optionnel) */
@keyframes mascotFloat {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33% { transform: translateY(-10px) rotate(2deg); }
    66% { transform: translateY(-5px) rotate(-1deg); }
}

.mascot-animation {
    animation: mascotFloat 4s ease-in-out infinite;
}

/* Animation des lignes de connexion entre les étapes */
@keyframes drawLine {
    from {
        stroke-dasharray: 1000;
        stroke-dashoffset: 1000;
    }
    to {
        stroke-dasharray: 1000;
        stroke-dashoffset: 0;
    }
}

/* Effet de pulsation pour les éléments importants */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.pulse-animation {
    animation: pulse 2s ease-in-out infinite;
}