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

:root {
    /* Colors from the app */
    --primary-blue: #2C5282;
    --sky-blue: #3182CE;
    --dark-primary-blue: #4A90E2;
    --dark-sky-blue: #7ED3F7;
    --success: #38A169;
    --warning: #D69E2E;
    --error: #E53E3E;
    --text-primary: #1A202C;
    --text-secondary: #4A5568;
    --background: #F7FAFC;
    --surface: #FFFFFF;
    --border: #E2E8F0;
    
    /* Dark mode colors */
    --dark-background: #0F1419;
    --dark-surface: #1A2332;
    --dark-text-primary: #FFFFFF;
    --dark-text-secondary: #A0AEC0;
    --dark-border: #2D3748;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
    scroll-behavior: smooth;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-6);
    }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-4);
    padding-bottom: var(--spacing-4);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.logo {
    font-size: var(--font-size-2xl);
}

.nav-links {
    display: none;
    align-items: center;
    gap: var(--spacing-6);
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition-fast);
}

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

.cta-button {
    background: linear-gradient(135deg, var(--primary-blue), var(--sky-blue));
    color: white !important;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: var(--transition-fast);
}

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

.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-fast);
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: none;
    }
}

/* Hero Section */
.hero {
    padding: calc(80px + var(--spacing-20)) 0 var(--spacing-20);
    background: linear-gradient(135deg, var(--background) 0%, #E6F3FF 100%);
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-12);
    align-items: center;
}

.hero-text h1 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-6);
    background: linear-gradient(135deg, var(--text-primary), var(--primary-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-8);
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-10);
}

.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4) var(--spacing-8);
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-normal);
    font-size: var(--font-size-lg);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue), var(--sky-blue));
    color: white;
    box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

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

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

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-6);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-blue);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--spacing-1);
}

/* App Screenshot */
.app-screenshot {
    position: relative;
    max-width: 320px;
    margin: 0 auto;
    text-align: center;
}

.phone-image {
    width: 100%;
    height: auto;
    max-width: 320px;
    border-radius: 24px;
    box-shadow: var(--shadow-xl);
    transition: var(--transition-normal);
}

.phone-image:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

@media (min-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .hero-text h1 {
        font-size: var(--font-size-5xl);
    }
    
    .hero-buttons {
        flex-direction: row;
    }
}

/* Features Section */
.features {
    padding: var(--spacing-20) 0;
    background: var(--surface);
}

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

.section-header h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-4);
    color: var(--text-primary);
}

.section-header p {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-8);
}

.feature-card {
    background: var(--surface);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    text-align: center;
    transition: var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-4);
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* How It Works Section */
.how-it-works {
    padding: var(--spacing-20) 0;
    background: var(--background);
}

.steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-12);
}

.step {
    display: flex;
    align-items: center;
    gap: var(--spacing-6);
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-blue), var(--sky-blue));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    line-height: 1.7;
}

@media (min-width: 768px) {
    .steps {
        flex-direction: row;
        text-align: center;
    }
    
    .step {
        flex-direction: column;
        flex: 1;
    }
    
    .step-number {
        width: 80px;
        height: 80px;
        font-size: var(--font-size-2xl);
    }
}

/* Gamification Section */
.gamification {
    padding: var(--spacing-20) 0;
    background: var(--surface);
}

.gamification-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-12);
    align-items: center;
}

.gamification-text h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-6);
    color: var(--text-primary);
}

.gamification-text p {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-8);
}

.gamification-features {
    list-style: none;
}

.gamification-features li {
    padding: var(--spacing-3) 0;
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
}

.achievement-showcase {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.achievement-card {
    background: var(--surface);
    padding: var(--spacing-6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--border);
    text-align: center;
    transition: var(--transition-normal);
}

.achievement-card.unlocked {
    border-color: var(--success);
    background: linear-gradient(135deg, var(--surface), #f0fff4);
}

.achievement-card.locked {
    opacity: 0.6;
    border-color: var(--border);
}

.achievement-card:hover {
    transform: translateY(-3px);
}

.achievement-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-3);
}

.achievement-card h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    color: var(--text-primary);
}

.achievement-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-3);
}

.xp-reward {
    background: var(--warning);
    color: white;
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    display: inline-block;
}

@media (min-width: 768px) {
    .gamification-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .achievement-showcase {
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--spacing-4);
    }
    
    .achievement-card {
        flex: 1;
        min-width: 150px;
    }
}

/* App Showcase Section */
.app-showcase {
    padding: var(--spacing-20) 0;
    background: var(--background);
}

.app-features-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-16);
    max-width: 1200px;
    margin: 0 auto;
}

.app-feature {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-8);
    align-items: center;
}

.app-feature.reverse {
    direction: rtl;
}

.app-feature.reverse > * {
    direction: ltr;
}

.feature-content {
    text-align: left;
}

.feature-content h3 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-4);
    line-height: 1.2;
}

.feature-content p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-6);
    line-height: 1.6;
}

.feature-highlights {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-highlights li {
    padding: var(--spacing-2) 0;
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.feature-image {
    text-align: center;
}

.app-screen {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
}

.app-screen:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

@media (min-width: 768px) {
    .app-feature {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-12);
    }
    
    .app-feature.reverse {
        direction: ltr;
    }
    
    .app-feature.reverse .feature-content {
        order: 2;
    }
    
    .app-feature.reverse .feature-image {
        order: 1;
    }
}

/* Pricing Section */
.pricing {
    padding: var(--spacing-20) 0;
    background: var(--background);
}

.pricing-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-8);
    max-width: 800px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--surface);
    padding: var(--spacing-10);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--border);
    text-align: center;
    position: relative;
    transition: var(--transition-normal);
}

.pricing-card:hover {
    transform: translateY(-5px);
}

.pricing-card.featured {
    border-color: var(--primary-blue);
    transform: scale(1.05);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-blue);
    color: white;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.plan-name {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--text-primary);
}

.plan-price {
    margin-bottom: var(--spacing-6);
}

.price {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--primary-blue);
}

.period {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}

.plan-features {
    list-style: none;
    margin-bottom: var(--spacing-8);
    text-align: left;
}

.plan-features li {
    padding: var(--spacing-2) 0;
    color: var(--text-secondary);
}

.plan-button {
    width: 100%;
    padding: var(--spacing-4) var(--spacing-6);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
}

.plan-button.primary {
    background: linear-gradient(135deg, var(--primary-blue), var(--sky-blue));
    color: white;
}

.plan-button.secondary {
    background: var(--surface);
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

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

.yearly-pricing {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: linear-gradient(135deg, #E6F3FF, #F0F8FF);
    border-radius: 0.75rem;
    border: 2px solid var(--primary-blue);
    text-align: center;
    box-sizing: border-box;
}

.yearly-deal {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 0.75rem;
}

.yearly-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.price-comparison {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    gap: 0.5rem;
}

.original-price {
    font-size: 1rem;
    color: var(--text-secondary);
    text-decoration: line-through;
    opacity: 0.8;
    margin: 0;
    line-height: 1.2;
}

.discount-badge {
    background: linear-gradient(135deg, var(--success), #48BB78);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    -webkit-animation: pulse 2s infinite;
    animation: pulse 2s infinite;
    display: inline-block;
    margin: 0;
    white-space: nowrap;
}

@-webkit-keyframes pulse {
    0%, 100% {
        -webkit-transform: scale(1);
        transform: scale(1);
        -webkit-box-shadow: 0 0 0 0 rgba(56, 161, 105, 0.7);
        box-shadow: 0 0 0 0 rgba(56, 161, 105, 0.7);
    }
    50% {
        -webkit-transform: scale(1.05);
        transform: scale(1.05);
        -webkit-box-shadow: 0 0 0 10px rgba(56, 161, 105, 0);
        box-shadow: 0 0 0 10px rgba(56, 161, 105, 0);
    }
}

@keyframes pulse {
    0%, 100% {
        -webkit-transform: scale(1);
        transform: scale(1);
        -webkit-box-shadow: 0 0 0 0 rgba(56, 161, 105, 0.7);
        box-shadow: 0 0 0 0 rgba(56, 161, 105, 0.7);
    }
    50% {
        -webkit-transform: scale(1.05);
        transform: scale(1.05);
        -webkit-box-shadow: 0 0 0 10px rgba(56, 161, 105, 0);
        box-shadow: 0 0 0 10px rgba(56, 161, 105, 0);
    }
}

@media (min-width: 768px) {
    .pricing-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .price-comparison {
        -webkit-box-orient: horizontal;
        -webkit-box-direction: normal;
        -ms-flex-direction: row;
        flex-direction: row;
        -webkit-box-pack: center;
        -ms-flex-pack: center;
        justify-content: center;
        -webkit-box-align: center;
        -ms-flex-align: center;
        align-items: center;
        gap: 1rem;
    }
}

/* Download Section */
.download {
    padding: var(--spacing-20) 0;
    background: linear-gradient(135deg, var(--primary-blue), var(--sky-blue));
    color: white;
    text-align: center;
}

.download-content h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-4);
}

.download-content p {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-10);
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-8);
}

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: var(--spacing-4) var(--spacing-6);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: white;
    transition: var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

.download-btn img {
    width: 24px;
    height: 24px;
}

.download-text {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

.download-store {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.download-note {
    opacity: 0.8;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-16) 0 var(--spacing-8);
}

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

.footer-brand {
    margin-bottom: var(--spacing-6);
}

.footer-brand .logo {
    margin-bottom: var(--spacing-3);
}

.footer-brand .brand-name {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
}

.footer-brand p {
    opacity: 0.8;
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-6);
}

.link-group h4 {
    font-weight: 600;
    margin-bottom: var(--spacing-4);
}

.link-group a {
    display: block;
    color: white;
    text-decoration: none;
    opacity: 0.8;
    margin-bottom: var(--spacing-2);
    transition: var(--transition-fast);
}

.link-group a:hover {
    opacity: 1;
    color: var(--sky-blue);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-6);
    text-align: center;
    opacity: 0.6;
}

@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: 2fr 3fr;
    }
}

/* Responsive Design */
@media (max-width: 767px) {
    .hero-text h1 {
        font-size: var(--font-size-3xl);
    }
    
    .section-header h2 {
        font-size: var(--font-size-3xl);
    }
    
    .phone-mockup {
        width: 240px;
        height: 480px;
    }
}

/* Smooth scrolling for anchor links */
html {
    scroll-behavior: smooth;
}

/* Loading animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.8s ease-out;
}

/* Hover effects */
.interactive:hover {
    transform: translateY(-2px);
    transition: var(--transition-fast);
}

/* Focus styles for accessibility */
button:focus,
a:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .navbar,
    .mobile-menu-toggle,
    .hero-buttons,
    .download-buttons {
        display: none;
    }
}