/* CSS Custom Properties */
:root {
    --color-primary: #348BBE;
    --color-red: #E1181B;
    --color-green: #23A400;
    --color-blue: #348BBE;
    --color-text: #2C3E50;
    --color-text-light: #5A6C7D;
    --color-background: #FFFFFF;
    --color-background-alt: #F8F9FA;
    --color-border: #E1E8ED;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;

    --max-width: 1200px;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
}

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

/* Typography */
h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

/* Hero Section */
.hero {
    background-color: var(--color-background);
    color: var(--color-text);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.app-icon {
    max-width: 120px;
    margin: 0 auto var(--spacing-md);
}

.app-icon img {
    width: 100%;
    height: auto;
}

.hero h1 {
    color: var(--color-text);
}

.tagline {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.25rem);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    color: var(--color-text-light);
    line-height: 1.8;
}

.cta-button {
    display: inline-block;
    background-color: var(--color-primary);
    color: var(--color-background);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 50px;
    font-size: 1.125rem;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid var(--color-primary);
}

.cta-button:hover {
    background-color: var(--color-background);
    color: var(--color-primary);
}

.hero-image {
    margin-top: var(--spacing-xl);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.hero-image img {
    border-radius: var(--border-radius);
}

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

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

.feature-card {
    background-color: var(--color-background-alt);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
}

.feature-card h3 {
    color: var(--color-primary);
}

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

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

.screenshots-grid {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
    -webkit-overflow-scrolling: touch;
}

.screenshot-item {
    flex: 0 0 auto;
    text-align: center;
}

.screenshot-item img {
    border-radius: var(--border-radius);
    height: 500px;
    width: auto;
}

.screenshot-caption {
    margin-top: var(--spacing-sm);
    font-size: 1rem;
    color: var(--color-text-light);
    font-weight: 500;
}

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

.features-list {
    list-style: none;
    max-width: 800px;
    margin: 0 auto;
}

.features-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    font-size: 1.125rem;
    color: var(--color-text-light);
    line-height: 1.8;
}

.features-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
    font-size: 1.5rem;
}

/* CTA Section */
.cta-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-background-alt);
    text-align: center;
}

.cta-section h2 {
    color: var(--color-text);
}

.cta-section p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-light);
}

/* Footer */
footer {
    background-color: var(--color-text);
    color: white;
    padding: var(--spacing-md) 0;
    text-align: center;
}

footer .container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

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

.footer-links a {
    color: white;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    text-decoration: underline;
}

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

    footer .container {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* Responsive Design - Desktop */
@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .hero {
        padding: var(--spacing-xl) 0 calc(var(--spacing-xl) + var(--spacing-lg));
    }

    .hero-image {
        max-width: 450px;
    }
}