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

:root {
    /* Colors - Apple-inspired palette */
    --primary: #007AFF;
    --primary-dark: #0051D5;
    --secondary: #5856D6;
    --accent: #FF3B30;
    --success: #34C759;
    --warning: #FF9500;
    
    /* Neutrals - Apple system colors */
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F2F2F7;
    --gray-200: #E5E5EA;
    --gray-300: #D1D1D6;
    --gray-400: #C7C7CC;
    --gray-500: #AEAEB2;
    --gray-600: #8E8E93;
    --gray-700: #636366;
    --gray-800: #48484A;
    --gray-900: #1C1C1E;
    
    /* Typography - SF Pro fonts */
    --font-display: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-text: 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing - Apple's 8pt grid */
    --spacing-1: 0.25rem;  /* 4px */
    --spacing-2: 0.5rem;   /* 8px */
    --spacing-3: 0.75rem;  /* 12px */
    --spacing-4: 1rem;     /* 16px */
    --spacing-5: 1.25rem;  /* 20px */
    --spacing-6: 1.5rem;   /* 24px */
    --spacing-8: 2rem;     /* 32px */
    --spacing-10: 2.5rem;  /* 40px */
    --spacing-12: 3rem;    /* 48px */
    --spacing-16: 4rem;    /* 64px */
    --spacing-20: 5rem;    /* 80px */
    --spacing-24: 6rem;    /* 96px */
    --spacing-32: 8rem;    /* 128px */
    
    /* Border Radius - Apple's rounded corners */
    --radius-sm: 0.375rem;   /* 6px */
    --radius-md: 0.5rem;     /* 8px */
    --radius-lg: 0.75rem;    /* 12px */
    --radius-xl: 1rem;       /* 16px */
    --radius-2xl: 1.5rem;    /* 24px */
    --radius-3xl: 2rem;      /* 32px */
    --radius-full: 9999px;
    
    /* Shadows - Apple's subtle shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);
    
    /* Transitions - Apple's smooth animations */
    --transition-fast: 150ms ease-out;
    --transition-normal: 300ms ease-out;
    --transition-slow: 500ms ease-out;
}

body {
    font-family: var(--font-text);
    font-size: 16px;
    line-height: 1.5;
    color: var(--gray-900);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition-normal);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-4) var(--spacing-6);
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo .logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
}

.nav-link {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 400;
    font-size: 0.9375rem;
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--gray-900);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-2);
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--gray-900);
    transition: var(--transition-fast);
}

/* Buttons */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3) var(--spacing-6);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-text);
    font-weight: 500;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    min-height: 44px; /* Apple's minimum touch target */
}

/* Ensure links with button classes work properly */
a.btn-primary, a.btn-secondary {
    border: none;
    text-decoration: none;
    color: inherit;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-50);
    color: var(--gray-900);
    border-color: var(--gray-400);
}

/* Ensure secondary button links work in dark sections */
.cta a.btn-secondary {
    color: var(--gray-300);
    border-color: var(--gray-600);
}

.cta a.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border-color: var(--gray-500);
}

/* Hero Section */
.hero {
    padding: var(--spacing-32) 0 var(--spacing-24);
    background: var(--white);
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 600;
    line-height: 1.1;
    color: var(--gray-900);
    margin-bottom: var(--spacing-6);
    letter-spacing: -0.02em;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-10);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-4);
    justify-content: center;
    margin-bottom: var(--spacing-16);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-12);
    justify-content: center;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-1);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* Features Section */
.features {
    padding: var(--spacing-24) 0;
    background: var(--gray-50);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-16);
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-4);
    letter-spacing: -0.02em;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-8);
}

.feature-card {
    background: var(--white);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-3);
}

.feature-description {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Download Section */
.download {
    padding: var(--spacing-24) 0;
    background: var(--white);
}

.download-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.download-buttons {
    display: flex;
    gap: var(--spacing-6);
    justify-content: center;
    margin: var(--spacing-12) 0;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4) var(--spacing-6);
    background: var(--gray-900);
    color: var(--white);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-text);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    min-height: 60px;
}

.download-btn:hover {
    background: var(--gray-800);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.download-btn.ios {
    background: var(--gray-900);
}

.download-btn.android {
    background: var(--primary);
}

.download-btn.android:hover {
    background: var(--primary-dark);
}

.download-label {
    display: block;
    font-size: 0.75rem;
    opacity: 0.8;
}

.download-platform {
    display: block;
    font-size: 1.125rem;
    font-weight: 600;
}

.app-features {
    display: flex;
    gap: var(--spacing-8);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-8);
}

.app-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--gray-600);
    font-size: 0.9375rem;
    font-weight: 500;
}

.app-feature svg {
    color: var(--success);
}

/* CTA Section */
.cta {
    padding: var(--spacing-24) 0;
    background: var(--gray-900);
    color: var(--white);
}

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

.cta-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    letter-spacing: -0.02em;
}

.cta-description {
    font-size: 1.125rem;
    color: var(--gray-300);
    margin-bottom: var(--spacing-8);
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-4);
    justify-content: center;
    margin-bottom: var(--spacing-6);
    flex-wrap: wrap;
}

.cta-note {
    font-size: 0.875rem;
    color: var(--gray-400);
}

/* Footer */
.footer {
    background: var(--gray-50);
    padding: var(--spacing-16) 0 var(--spacing-8);
    border-top: 1px solid var(--gray-200);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-16);
    margin-bottom: var(--spacing-8);
}

.footer-brand .logo-text {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-3);
    display: block;
}

.footer-description {
    color: var(--gray-600);
    font-size: 0.9375rem;
    line-height: 1.5;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-8);
}

.footer-column h4 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-4);
}

.footer-link {
    display: block;
    color: var(--gray-600);
    text-decoration: none;
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-2);
    transition: var(--transition-fast);
}

.footer-link:hover {
    color: var(--gray-900);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-8);
    border-top: 1px solid var(--gray-200);
}

.footer-copyright {
    color: var(--gray-500);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        padding: var(--spacing-24) 0 var(--spacing-16);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        gap: var(--spacing-8);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .privacy-features {
        grid-template-columns: 1fr;
    }
    
    .privacy-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-4);
    }
    
    .nav-container {
        padding: var(--spacing-3) var(--spacing-4);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .cta-title {
        font-size: 2rem;
    }
}