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

:root {
    /* Color Palette */
    --primary-purple: #8B5CF6;
    --primary-violet: #A78BFA;
    --primary-indigo: #6366F1;
    --secondary-purple: #7C3AED;
    --accent-green: #10B981;
    --accent-blue: #3B82F6;
    --accent-orange: #F59E0B;
    --accent-red: #EF4444;
    
    /* Neutral Colors */
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-light: #9CA3AF;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --border-color: #E5E7EB;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 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;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

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

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

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

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-purple);
    transition: width var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-purple);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        transition: left var(--transition-base);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    padding-bottom: var(--spacing-2xl);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
}

.gradient-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.05) 0%, rgba(167, 139, 250, 0.05) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-text {
    z-index: 1;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-violet) 100%);
    -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-xl);
    line-height: 1.7;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-base);
    text-decoration: none;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-violet) 100%);
    color: white;
    box-shadow: 0 4px 14px rgba(139, 92, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.5);
}

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

.btn-secondary:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--primary-purple);
    color: var(--primary-purple);
}

.btn-icon {
    font-size: 1.25rem;
}

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

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--primary-purple);
}

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

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

.phone-mockup {
    width: 320px;
    height: 640px;
    background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-violet) 100%);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 20px 60px rgba(139, 92, 246, 0.3);
    position: relative;
}

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

.app-preview {
    height: 100%;
    display: flex;
    flex-direction: column;
    background: linear-gradient(180deg, #F9FAFB 0%, #FFFFFF 100%);
}

.app-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background-color: white;
    border-bottom: 1px solid var(--border-color);
}

.app-icon {
    font-size: 1.5rem;
}

.app-title {
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--text-primary);
}

.app-content {
    flex: 1;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.preview-card {
    background-color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.card-header {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.wellness-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-violet) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.score {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: white;
}

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

.stat-badge {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    text-align: center;
    color: var(--text-primary);
}

@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .phone-mockup {
        width: 280px;
        height: 560px;
        margin: 0 auto;
    }
}

/* Section Header */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Features Section */
.features {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-secondary);
}

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

.feature-card {
    background-color: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

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

.feature-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.feature-list li {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    padding-left: var(--spacing-md);
    position: relative;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-green);
    font-weight: 700;
}

/* How It Works Section */
.how-it-works {
    padding: var(--spacing-3xl) 0;
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

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

.step-number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-violet) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    font-weight: 800;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

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

/* Benefits Section */
.benefits {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-secondary);
}

.benefits-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.benefit-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.benefit-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.benefit-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-green) 0%, #059669 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    font-weight: 700;
    flex-shrink: 0;
}

.benefit-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

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

.visual-card {
    background-color: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.card-icon {
    font-size: 1.5rem;
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
}

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

.chart-bar {
    flex: 1;
    background: linear-gradient(180deg, var(--primary-purple) 0%, var(--primary-violet) 100%);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    min-height: 50px;
}

.card-footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

@media (max-width: 968px) {
    .benefits-content {
        grid-template-columns: 1fr;
    }
}

/* Download Section */
.download {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-violet) 100%);
    color: white;
    text-align: center;
}

.download-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
}

.download-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

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

.download-btn {
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    text-decoration: none;
    transition: all var(--transition-base);
}

.download-btn:hover {
    background-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.download-btn-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.download-btn-icon {
    font-size: 2rem;
}

.download-btn-label {
    font-size: var(--font-size-xs);
    opacity: 0.9;
}

.download-btn-name {
    font-size: var(--font-size-lg);
    font-weight: 700;
}

.download-note {
    font-size: var(--font-size-sm);
    opacity: 0.85;
}

/* Footer */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

.footer-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

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

/* Responsive Typography */
@media (max-width: 768px) {
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .download-title {
        font-size: var(--font-size-3xl);
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}