:root {
    --primary-color: #007AFF;
    /* iOS Blue-ish */
    --text-color: #1d1d1f;
    --secondary-text: #86868b;
    --background-color: #ffffff;
    --section-bg: #f5f5f7;
    --max-width: 980px;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    color: var(--text-color);
    background-color: var(--background-color);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    text-decoration: underline;
}

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

/* Header */
header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 20px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    /* Subtle border */
}

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

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-links a {
    margin-left: 20px;
    font-size: 0.9rem;
    color: var(--secondary-text);
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text-color);
    text-decoration: none;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 100px 20px 60px;
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.hero p.subtitle {
    font-size: 1.5rem;
    color: var(--secondary-text);
    max-width: 600px;
    margin: 0 auto 40px;
    font-weight: 400;
}

.app-screenshot {
    margin-top: 60px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    max-width: 100%;
    width: 300px;
    /* Mobile proportion */
    height: auto;
}

/* Features */
.features {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.5rem;
    letter-spacing: -0.015em;
    margin-bottom: 10px;
}

.section-title p {
    font-size: 1.2rem;
    color: var(--secondary-text);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    padding: 20px;
}

.feature-item {
    background: var(--section-bg);
    padding: 40px;
    border-radius: 24px;
    text-align: center;
    transition: transform 0.3s ease;
}

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

.feature-item h3 {
    margin: 20px 0 10px;
    font-size: 1.5rem;
}

.feature-item p {
    color: var(--secondary-text);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

/* Download / CTA */
.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 30px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--text-color);
    color: white;
    border-radius: 30px;
    font-weight: 500;
    transition: opacity 0.2s;
    text-decoration: none;
}

.btn:hover {
    opacity: 0.8;
    text-decoration: none;
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

/* Footer */
footer {
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    padding: 60px 0;
    margin-top: 60px;
    color: var(--secondary-text);
    font-size: 0.9rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

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

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

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p.subtitle {
        font-size: 1.2rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links a {
        margin: 0 10px;
    }
}