/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-navy: #1e293b;
    --color-charcoal: #334155;
    --color-off-white: #f8fafc;
    --color-white: #ffffff;
    --color-text-primary: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-tertiary: #94a3b8;
    --color-border: #e2e8f0;
    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    --max-width: 1200px;
    --border-radius: 0.5rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Header */
.header {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-navy);
    letter-spacing: -0.02em;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    text-align: center;
    line-height: 1.5;
}

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

.btn-primary:hover {
    background: var(--color-charcoal);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(30, 41, 59, 0.15);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-navy);
    border: 1.5px solid var(--color-navy);
}

.btn-secondary:hover {
    background: var(--color-off-white);
    border-color: var(--color-charcoal);
}

.btn-large {
    padding: 1rem 2.25rem;
    font-size: 1.125rem;
}

/* Hero Section */
.hero {
    padding: var(--spacing-xl) 0;
    text-align: center;
    background: var(--color-off-white);
    border-bottom: 1px solid var(--color-border);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
    color: var(--color-navy);
    letter-spacing: -0.03em;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.hero-subtitle {
    font-size: 1.375rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
    line-height: 1.6;
}

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

/* Problem Section */
.problem {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

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

.problem-item h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-navy);
}

.problem-item p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 1.0625rem;
}

/* How It Works Section */
.how-it-works {
    padding: var(--spacing-xl) 0;
    background: var(--color-off-white);
}

.section-title {
    font-size: 2.75rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    color: var(--color-navy);
    letter-spacing: -0.02em;
}

.section-subtitle {
    text-align: center;
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.step {
    text-align: center;
    padding: var(--spacing-md);
}

.step-number {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    background: var(--color-navy);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0 auto var(--spacing-md);
}

.step h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-navy);
}

.step p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 1.0625rem;
}

/* Audio Demo Section */
.audio-demo {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

.audio-wrapper {
    max-width: 700px;
    margin: var(--spacing-lg) auto;
    padding: var(--spacing-md);
    background: var(--color-off-white);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.audio-player {
    width: 100%;
    height: 3.5rem;
    outline: none;
}

.audio-player::-webkit-media-controls-panel {
    background-color: var(--color-white);
}

.transcript {
    max-width: 800px;
    margin: var(--spacing-lg) auto 0;
    padding: var(--spacing-md);
    background: var(--color-off-white);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.transcript h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-navy);
}

.transcript-content {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.transcript-content p {
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

.transcript-content p.active {
    background-color: rgba(59, 130, 246, 0.1);
    border-left: 3px solid var(--color-accent);
    color: var(--color-text-primary);
    font-weight: 500;
}

.transcript-content strong {
    color: var(--color-navy);
    font-weight: 600;
}

/* Benefits Section */
.benefits {
    padding: var(--spacing-xl) 0;
    background: var(--color-off-white);
}

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

.benefit-item {
    padding: var(--spacing-md);
}

.benefit-item h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-navy);
}

.benefit-item p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 1.0625rem;
}

/* FAQ Section */
.faq {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

.faq-list {
    max-width: 800px;
    margin: var(--spacing-lg) auto 0;
}

.faq-item {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-navy);
}

.faq-item p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 1.0625rem;
}

/* Final CTA Section */
.final-cta {
    padding: var(--spacing-xl) 0;
    text-align: center;
    background: var(--color-navy);
    color: var(--color-white);
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.cta-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.final-cta .btn-primary {
    background: var(--color-white);
    color: var(--color-navy);
}

.final-cta .btn-primary:hover {
    background: var(--color-off-white);
    color: var(--color-navy);
}

/* Footer */
.footer {
    padding: var(--spacing-lg) 0 var(--spacing-md);
    background: var(--color-off-white);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.footer-section h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-navy);
}

.footer-section p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.footer-section a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-section a:hover {
    color: var(--color-navy);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 4rem;
        --spacing-lg: 3rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .section-subtitle {
        font-size: 1.125rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-cta .btn {
        width: 100%;
        max-width: 100%;
    }

    .problem-grid,
    .benefits-grid {
        grid-template-columns: 1fr;
    }

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

    .cta-title {
        font-size: 2rem;
    }

    .cta-subtitle {
        font-size: 1.125rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-title {
        font-size: 2rem;
    }

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