/* CSS Variables */
:root {
    --color-primary: #007AFF;
    --color-primary-dark: #0056CC;
    --color-text: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-background: #ffffff;
    --color-background-secondary: #f5f5f7;
    --color-border: #d2d2d7;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background: var(--color-background);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

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

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

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 600;
    font-size: 1.1rem;
}

.nav-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.9rem;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.1rem;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

/* Hero Section */
.hero {
    padding: calc(80px + var(--spacing-2xl)) 0 var(--spacing-2xl);
    background: linear-gradient(180deg, var(--color-background-secondary) 0%, var(--color-background) 100%);
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 500px;
}

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

.hero-platforms {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

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

.device-mockup {
    position: relative;
    width: 380px;
}

.device-mockup::before {
    content: '';
    position: absolute;
    inset: -20px;
    background: linear-gradient(135deg, var(--color-primary) 0%, #5856D6 100%);
    border-radius: 36px;
    opacity: 0.1;
    z-index: -1;
}

.device-mockup .screenshot {
    border-radius: 0;
    box-shadow: var(--shadow-lg);
    background: #000;
    aspect-ratio: 3/4;
    object-fit: cover;
}

/* Features Section */
.features {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-top: calc(var(--spacing-md) * -1);
    margin-bottom: var(--spacing-xl);
}

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

.feature-card {
    padding: var(--spacing-lg);
    background: var(--color-background);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: var(--color-background-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.feature-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

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

/* Screenshots Section */
.screenshots {
    padding: var(--spacing-2xl) 0;
    background: var(--color-background-secondary);
    overflow: hidden;
}

.screenshots-scroll {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.screenshots-scroll::-webkit-scrollbar {
    display: none;
}

.screenshot-item {
    flex: 0 0 auto;
    width: 240px;
    scroll-snap-align: center;
}

.screenshot-item img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    background: #f0f0f0;
    aspect-ratio: 9/19.5;
    object-fit: cover;
}

/* CTA Section */
.cta {
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.cta p {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Footer */
.footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 600;
}

.footer-icon {
    width: 28px;
    height: 28px;
    border-radius: 6px;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

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

.footer-copyright {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

/* Responsive */
@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

    .device-mockup {
        width: 300px;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .cta h2 {
        font-size: 2rem;
    }

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

/* Placeholder styles for missing images */
.device-mockup .screenshot,
.screenshot-item img {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.nav-icon,
.footer-icon {
    background: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
}