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

:root {
    /* Colors */
    --primary-color: #4F46E5;
    --primary-dark: #4338CA;
    --secondary-color: #06B6D4;
    --accent-color: #F59E0B;
    --text-dark: #1F2937;
    --text-light: #6B7280;
    --bg-light: #F9FAFB;
    --bg-white: #FFFFFF;
    --border-color: #E5E7EB;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-dark);
    background-color: var(--bg-white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Navigation */
.navbar {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.nav-links .investor-link {
    color: var(--primary-color);
    font-weight: 600;
}

/* Hero Section */
.hero {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

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

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.btn {
    padding: 0.875rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

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

.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
}

.stat {
    text-align: left;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* Phone Mockup */
.phone-mockup {
    position: relative;
    width: 300px;
    height: 600px;
    background: #1F2937;
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    margin: 0 auto;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 32px;
    overflow: hidden;
}

.app-preview {
    padding: var(--spacing-md);
}

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

.preview-header h3 {
    color: var(--text-dark);
    font-size: 1.25rem;
}

.health-score {
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 700;
    font-size: 1.5rem;
}

.preview-chart {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
    height: 200px;
    margin-bottom: var(--spacing-md);
}

.chart-bar {
    flex: 1;
    background: linear-gradient(to top, var(--primary-color), var(--secondary-color));
    border-radius: 8px 8px 0 0;
}

.preview-insight {
    background: var(--bg-light);
    padding: var(--spacing-sm);
    border-radius: 12px;
    color: var(--text-dark);
}

/* Who It's For Section */
.who-its-for {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.who-its-for .section-header h2,
.who-its-for .section-header p {
    color: white;
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.audience-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    border-radius: 16px;
    text-align: center;
    border: 2px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.audience-card:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.4);
}

.audience-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.audience-card h3 {
    color: white;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.audience-card p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
}

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

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

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.section-header p {
    font-size: 1.25rem;
    color: var(--text-light);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.problem-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: 16px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.problem-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.problem-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.problem-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

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

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

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

.feature-card {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 10px 25px rgba(79, 70, 229, 0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

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

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

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

.step {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    align-items: flex-start;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.step-content p {
    color: var(--text-light);
    line-height: 1.6;
}

/* Security Section */
.security {
    padding: var(--spacing-xl) 0;
}

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

.security-subtitle {
    font-size: 1.25rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

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

.security-feature {
    display: flex;
    gap: var(--spacing-sm);
}

.check-icon {
    width: 30px;
    height: 30px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.security-feature h4 {
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
    color: var(--text-dark);
}

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

.encryption-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-light);
    border-radius: 16px;
}

.diagram-step {
    text-align: center;
}

.diagram-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-xs);
}

.diagram-arrow {
    font-size: 2rem;
    color: var(--primary-color);
}

.diagram-caption {
    text-align: center;
    margin-top: var(--spacing-sm);
    color: var(--text-light);
    font-style: italic;
}

/* Social Proof */
.social-proof {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-light);
}

.proof-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.proof-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.proof-card h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.proof-card p {
    color: var(--text-light);
}

/* Waitlist Section */
.waitlist {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

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

.waitlist-content h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.waitlist-content p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
}

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

.waitlist-form input {
    flex: 1;
    padding: 1rem;
    border-radius: 8px;
    border: none;
    font-size: 1rem;
}

.waitlist-note {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Investors Section */
.investors {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-light);
}

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

.investor-content h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.investor-content p {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.investor-note {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: var(--spacing-sm);
}

/* Footer */
.footer {
    background-color: var(--text-dark);
    color: white;
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    margin-bottom: var(--spacing-xs);
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content,
    .security-content {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .nav-links {
        gap: var(--spacing-sm);
        font-size: 0.875rem;
    }
    
    .phone-mockup {
        width: 250px;
        height: 500px;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .waitlist-form {
        flex-direction: column;
    }
}