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

:root {
    --color-primary: #2d3748;
    --color-secondary: #4a5568;
    --color-accent: #3182ce;
    --color-accent-hover: #2c5282;
    --color-background: #ffffff;
    --color-surface: #f7fafc;
    --color-text: #1a202c;
    --color-text-light: #718096;
    --color-border: #e2e8f0;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-accent-hover);
}

/* Header & Navigation */
.header {
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

.logo:hover {
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--color-secondary);
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* Main Content */
main {
    flex: 1;
}

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

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.hero p {
    font-size: 1.25rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* Apps Section */
.apps-section {
    padding: var(--spacing-xl) var(--spacing-md);
    max-width: var(--max-width);
    margin: 0 auto;
}

.apps-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-primary);
}

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

.app-card {
    display: block;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-md);
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    color: var(--color-text);
}

.app-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
    color: var(--color-text);
}

.app-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.app-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* Placeholder Icons */
.placeholder-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    color: white;
    margin: 0 auto var(--spacing-sm);
}

.app-icon-large {
    width: 120px;
    height: 120px;
    font-size: 3rem;
    border-radius: 28px;
}

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

.app-hero-content {
    max-width: 600px;
    margin: 0 auto;
}

.app-hero h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.tagline {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

/* Store Buttons */
.store-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.store-button {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 8px;
    transition: background-color 0.2s ease;
}

.store-button:hover {
    background-color: var(--color-secondary);
    color: white;
}

.store-button span {
    font-size: 0.75rem;
}

.store-button strong {
    font-size: 1.1rem;
}

/* Features Section */
.features-section {
    padding: var(--spacing-xl) var(--spacing-md);
    max-width: var(--max-width);
    margin: 0 auto;
}

.features-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-md);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background-color: var(--color-accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto var(--spacing-sm);
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.feature-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* Screenshots Section */
.screenshots-section {
    padding: var(--spacing-xl) var(--spacing-md);
    background-color: var(--color-surface);
}

.screenshots-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-primary);
}

.screenshots-grid {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    max-width: var(--max-width);
    margin: 0 auto;
}

.screenshot {
    width: 200px;
    height: 400px;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.placeholder-screenshot {
    background: linear-gradient(180deg, var(--color-border) 0%, var(--color-surface) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
    font-size: 0.9rem;
    border: 1px solid var(--color-border);
}

/* Contact Section */
.contact-section {
    padding: var(--spacing-xl) var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

.contact-section h1 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.contact-intro {
    text-align: center;
    color: var(--color-text-light);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
}

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

.contact-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-md);
}

.contact-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.contact-card p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.support-links {
    list-style: none;
}

.support-links li {
    margin-bottom: var(--spacing-xs);
}

/* Footer */
.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-md);
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        justify-content: center;
        text-align: center;
    }

    .nav-links {
        justify-content: center;
        gap: var(--spacing-sm);
    }

    .hero h1,
    .app-hero h1,
    .contact-section h1 {
        font-size: 2rem;
    }

    .hero p,
    .tagline {
        font-size: 1.1rem;
    }

    .screenshot {
        width: 160px;
        height: 320px;
    }
}