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

:root {
    /* Colors matching the app theme */
    --primary-red: #D32F2F;
    --primary-red-light: #EF5350;
    --primary-blue: #1976D2;
    --primary-blue-light: #42A5F5;
    --success-green: #4CAF50;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #D32F2F 0%, #1976D2 100%);
    --gradient-blue-red: linear-gradient(90deg, #1976D2 0%, #D32F2F 100%);
    --gradient-background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    
    /* Neutrals */
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-light: #ffffff;
    --bg-light: #ffffff;
    --bg-gray: #f5f5f5;
    --bg-dark: #1a1a1a;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-light);
    overflow-x: hidden;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
}

.text-gradient {
    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);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 800;
}

.logo-icon {
    font-size: 2rem;
}

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

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

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

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.gradient-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-background);
    opacity: 0.05;
    z-index: -1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
    padding: var(--spacing-xxl) 0;
}

.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);
    max-width: 600px;
}

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

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

.button-primary {
    background: var(--gradient-primary);
    color: var(--text-light);
    box-shadow: var(--shadow-md);
}

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

.button-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--primary-red);
}

.button-secondary:hover {
    background: var(--primary-red);
    color: var(--text-light);
}

.cta-button {
    padding: 0.75rem 1.5rem;
    background: var(--gradient-primary);
    color: var(--text-light);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Phone Mockup */
.phone-mockup {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-frame {
    position: relative;
    width: 300px;
    height: 600px;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.phone-notch {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 150px;
    height: 30px;
    background: #1a1a1a;
    border-radius: 0 0 20px 20px;
    z-index: 10;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--gradient-background);
    border-radius: 32px;
    overflow: hidden;
}

.app-screenshot {
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, 
        rgba(211, 47, 47, 0.1) 0%, 
        rgba(25, 118, 210, 0.1) 100%);
}

/* Section Styles */
section {
    padding: var(--spacing-xxl) 0;
}

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

.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;
}

/* Features Section */
.features {
    background: var(--bg-gray);
}

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

.feature-card {
    background: var(--bg-light);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

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

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

.feature-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

/* Languages Section */
.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.language-card {
    background: var(--bg-light);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.language-card:hover {
    border-color: var(--primary-red);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

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

.language-name {
    font-weight: 600;
    color: var(--text-primary);
}

/* Categories Section */
.categories {
    background: var(--bg-light);
    padding: var(--spacing-xxl) 0;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.category-card {
    background: linear-gradient(135deg, 
        rgba(211, 47, 47, 0.03) 0%, 
        rgba(25, 118, 210, 0.03) 100%);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-blue);
}

.category-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
}

.category-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.category-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.category-topics {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-topics li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--text-primary);
}

.category-topics li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-green);
    font-weight: bold;
}

/* Languages Section */
.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.language-card {
    background: var(--bg-light);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.language-card:hover {
    border-color: var(--primary-red);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

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

.language-name {
    font-weight: 600;
    color: var(--text-primary);
}

/* Premium Section */
.premium {
    background: linear-gradient(135deg, 
        rgba(211, 47, 47, 0.05) 0%, 
        rgba(25, 118, 210, 0.05) 100%);
    padding: var(--spacing-xxl) 0;
}

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

.premium-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gradient-primary);
    color: var(--text-light);
    border-radius: var(--radius-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

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

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

.premium-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: left;
}

.premium-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.125rem;
}

/* Download Section */
.download {
    background: var(--bg-gray);
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.store-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 1rem 2rem;
    background: var(--bg-dark);
    color: var(--text-light);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all 0.3s ease;
}

.store-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.store-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.store-label {
    font-size: 0.75rem;
    opacity: 0.8;
}

.store-name {
    font-size: 1.25rem;
    font-weight: 600;
}

/* FAQ Section */
.faq {
    background: var(--bg-light);
    padding: var(--spacing-xxl) 0;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-gray);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.faq-item:hover {
    border-left-color: var(--primary-red);
    box-shadow: var(--shadow-sm);
}

.faq-question {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-blue);
}

.faq-answer {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Testimonials Section */
.testimonials {
    background: linear-gradient(135deg, 
        rgba(211, 47, 47, 0.03) 0%, 
        rgba(25, 118, 210, 0.03) 100%);
    padding: var(--spacing-xxl) 0;
}

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

.testimonial-card {
    background: var(--bg-light);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

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

.testimonial-rating {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: #FFC107;
}

.testimonial-text {
    color: var(--text-secondary);
    line-height: 1.7;
    font-style: italic;
    margin-bottom: var(--spacing-lg);
}

.testimonial-author {
    border-top: 1px solid var(--bg-gray);
    padding-top: var(--spacing-md);
}

.author-name {
    font-weight: 600;
    color: var(--text-primary);
}

.author-location {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Download Section */
.download {
    background: var(--bg-gray);
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.store-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 1rem 2rem;
    background: var(--bg-dark);
    color: var(--text-light);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all 0.3s ease;
}

.store-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.store-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.store-label {
    font-size: 0.75rem;
    opacity: 0.8;
}

.store-name {
    font-size: 1.25rem;
    font-weight: 600;
}

/* Footer */
.footer {
    background: #1a1a1a;
    color: var(--text-light);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: var(--spacing-xxl);
    margin-bottom: var(--spacing-xl);
}

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

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

.footer-description {
    color: rgba(255, 255, 255, 0.6);
    margin-top: var(--spacing-md);
    max-width: 300px;
    line-height: 1.6;
}

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

.footer-title {
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-column a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.9375rem;
}

.footer-column a:hover {
    color: var(--primary-red-light);
}

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

.footer-bottom p {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.875rem;
}

.disclaimer {
    margin-top: var(--spacing-sm);
    font-size: 0.8125rem;
}

/* Responsive Design */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .phone-mockup {
        display: none;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-description {
        margin-left: auto;
        margin-right: auto;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .button {
        width: 100%;
        justify-content: center;
    }
}

/* N-400 Interview Questions Section */
.n400-section {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, rgba(25, 118, 210, 0.05) 0%, rgba(211, 47, 47, 0.05) 100%);
}

.n400-content {
    margin-top: var(--spacing-xl);
}

.n400-intro {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.n400-badge {
    display: inline-block;
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.n400-intro h3 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.n400-intro p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.n400-parts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.n400-part-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.n400-part-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue-light);
}

.part-number {
    display: inline-block;
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.part-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.part-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.n400-features {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-blue);
}

.n400-features h4 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.n400-features ul {
    list-style: none;
    padding: 0;
}

.n400-features li {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-sm);
    line-height: 1.6;
}

@media (max-width: 768px) {
    .n400-parts-grid {
        grid-template-columns: 1fr;
    }
    
    .n400-intro h3 {
        font-size: 1.5rem;
    }
    
    .n400-intro p {
        font-size: 1rem;
    }
}

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

.hero-content,
.feature-card,
.language-card,
.n400-part-card {
    animation: fadeInUp 0.6s ease-out;
}