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

:root {
    /* Colors from Design Guide */
    --primary-teal: #00BFA6;
    --secondary-lavender: #B18BE4;
    --bg-light-gray: #FAFAFC;
    --bg-white: #FFFFFF;
    --text-primary: #212529;
    --text-secondary: #6C757D;
    --success-green: #1BC47D;
    --error-red: #F76C6C;
    --info-blue: #74C0FC;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'SF Pro', 'Open Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    
    /* Border Radius */
    --radius: 16px;
    --radius-sm: 8px;
    --radius-lg: 24px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-light-gray);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Header */
.header {
    background-color: var(--bg-white);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: var(--spacing-md) 0;
}

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

.logo-img {
    height: 40px;
    width: auto;
}

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

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-teal);
}

.nav-link.download-btn {
    background-color: var(--primary-teal);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.nav-link.download-btn:hover {
    background-color: #009688;
}

/* Hero Section */
.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--bg-light-gray) 0%, #E8F5F3 100%);
}

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

.hero-content {
    text-align: center;
}

.hero-title {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.btn-download {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    background-color: var(--text-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

.btn-download svg {
    width: 28px;
    height: 28px;
}

.btn-appstore {
    background-color: #000000;
}

.btn-playstore {
    background-color: #000000;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    max-width: 280px;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.15));
}

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

.section-title {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-primary);
}

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

.feature-card {
    background-color: var(--bg-light-gray);
    padding: var(--spacing-xl);
    border-radius: var(--radius);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 191, 166, 0.15);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-text {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Screenshots Section */
.screenshots {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-light-gray);
}

.screenshot-slider {
    overflow: hidden;
    border-radius: var(--radius);
    margin-bottom: var(--spacing-lg);
}

.screenshot-track {
    display: flex;
    gap: var(--spacing-md);
    transition: transform 0.4s ease;
}

.screenshot-item {
    flex: 0 0 100%;
    display: flex;
    justify-content: center;
}

.screenshot-item img {
    max-width: 320px;
    width: 100%;
    height: auto;
    border-radius: var(--radius);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.slider-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.slider-btn {
    width: 48px;
    height: 48px;
    border: none;
    background-color: var(--primary-teal);
    color: white;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slider-btn:hover {
    background-color: #009688;
    transform: scale(1.05);
}

/* About Section */
.about {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-white);
}

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

.about-text {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.about-list {
    list-style: none;
    margin-bottom: var(--spacing-xl);
}

.about-list li {
    font-size: 16px;
    color: var(--text-secondary);
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-xl);
    position: relative;
}

.about-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-teal);
    font-weight: 700;
    font-size: 20px;
}

.about-text.highlight {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 20px;
}

/* How to Use Section */
.how-to-use {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--primary-teal) 0%, var(--secondary-lavender) 100%);
    color: white;
}

.how-to-use .section-title {
    color: white;
}

.steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.step {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.step-number {
    width: 48px;
    height: 48px;
    background-color: white;
    color: var(--primary-teal);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    flex-shrink: 0;
}

.step p {
    font-size: 16px;
    line-height: 1.5;
}

/* Download CTA Section */
.download-cta {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-light-gray);
    text-align: center;
}

.cta-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.cta-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* Disclaimer Section */
.disclaimer {
    padding: var(--spacing-xl) 0;
    background-color: #FFF9E6;
    border-top: 2px solid #FFE066;
    border-bottom: 2px solid #FFE066;
}

.disclaimer-text {
    text-align: center;
    color: #856404;
    font-size: 14px;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
}

/* Footer */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-logo {
    height: 50px;
    width: auto;
    margin-bottom: var(--spacing-sm);
}

.footer-tagline {
    color: var(--text-secondary);
    font-size: 14px;
}

.footer-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: white;
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.social-link:hover {
    color: var(--primary-teal);
}

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

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 14px;
}

.footer-link:hover {
    color: var(--primary-teal);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    font-size: 14px;
}

/* Responsive Design - Tablet */
@media (min-width: 768px) {
    .nav-link {
        font-size: 15px;
    }
    
    .hero-title {
        font-size: 48px;
    }
    
    .hero-subtitle {
        font-size: 20px;
    }
    
    .phone-mockup {
        max-width: 320px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .screenshot-item {
        flex: 0 0 50%;
    }
    
    .screenshot-item img {
        max-width: 280px;
    }
    
    .steps {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Responsive Design - Desktop */
@media (min-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr 1fr;
    }
    
    .hero-content {
        text-align: left;
    }
    
    .download-buttons {
        justify-content: flex-start;
    }
    
    .hero-title {
        font-size: 56px;
    }
    
    .hero-subtitle {
        font-size: 20px;
        margin-left: 0;
    }
    
    .phone-mockup {
        max-width: 400px;
    }
    
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .screenshot-item {
        flex: 0 0 33.333%;
    }
    
    .screenshot-item img {
        max-width: 300px;
    }
    
    .steps {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (min-width: 1200px) {
    .screenshot-item {
        flex: 0 0 25%;
    }
}

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

.feature-card,
.step {
    animation: fadeInUp 0.6s ease-out;
}

/* Print Styles */
@media print {
    .header,
    .download-buttons,
    .slider-controls,
    .footer {
        display: none;
    }
}