:root {
    --primary-color: #007AFF;
    --text-color: #1d1d1f;
    --bg-color: #ffffff;
    --secondary-bg: #f5f5f7;
    --footer-bg: #f5f5f7;
    --footer-text: #86868b;
    --max-width: 980px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: "SF Pro Text", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 44px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    z-index: 9999;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo {
    font-weight: 600;
    font-size: 20px;
    color: var(--text-color);
}

/* Hero Section */
.hero {
    padding-top: 120px;
    padding-bottom: 80px;
    text-align: center;
    background-color: var(--bg-color);
    overflow: hidden;
}

.hero-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.app-icon {
    width: 120px;
    height: 120px;
    border-radius: 24px;
    margin-bottom: 24px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    object-fit: cover;
}

.hero h1 {
    font-size: 48px;
    line-height: 1.08349;
    font-weight: 700;
    letter-spacing: -0.003em;
    margin-bottom: 12px;
}

.hero h2 {
    font-size: 24px;
    line-height: 1.16667;
    font-weight: 400;
    letter-spacing: .009em;
    color: #86868b;
    margin-bottom: 32px;
}

.cta-button img {
    height: 60px;
    transition: transform 0.2s ease;
}

.cta-button:hover img {
    transform: scale(1.05);
}

.hero-image-container {
    margin-top: 60px;
    position: relative;
    width: 100%;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.hero-screenshots {
    display: flex;
    justify-content: center;
    gap: 20px;
    overflow-x: auto;
    padding: 20px;
    scrollbar-width: none; /* Firefox */
}

.hero-screenshots::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

.screenshot {
    width: 280px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    transition: transform 0.3s ease;
}

.screenshot:hover {
    transform: translateY(-10px);
}

/* Features Section */
.features {
    background-color: var(--secondary-bg);
    padding: 100px 0;
}

.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section-title {
    font-size: 40px;
    line-height: 1.1;
    font-weight: 700;
    letter-spacing: 0em;
    margin-bottom: 60px;
    text-align: center;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    background: #fff;
    padding: 40px;
    border-radius: 24px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card h3 {
    font-size: 24px;
    line-height: 1.16667;
    font-weight: 600;
    letter-spacing: .009em;
    margin-bottom: 16px;
    color: var(--text-color);
}

.feature-card p {
    font-size: 17px;
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
    color: #86868b;
}

/* About Section */
.about {
    padding: 100px 0;
    background-color: var(--bg-color);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 19px;
    line-height: 1.4211;
    font-weight: 400;
    letter-spacing: .012em;
    color: var(--text-color);
}

.about-content p {
    margin-bottom: 24px;
}

/* Footer */
.footer {
    background-color: var(--footer-bg);
    padding: 40px 0;
    font-size: 12px;
    line-height: 1.33337;
    font-weight: 400;
    letter-spacing: -0.01em;
    color: var(--footer-text);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-links a {
    margin-left: 20px;
    color: var(--footer-text);
}

.footer-links a:hover {
    text-decoration: underline;
    color: var(--text-color);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 40px;
    }
    
    .hero h2 {
        font-size: 20px;
    }
    
    .screenshot {
        width: 220px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links a {
        margin: 0 10px;
    }
}