/* Reset and base styles */
:root {
    --primary-color: #000;
    --secondary-color: #86868b;
    --background-color: #fff;
    --accent-color: #0071e3;
    --section-spacing: 120px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    line-height: 1.5;
    color: var(--primary-color);
    background-color: var(--background-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1 {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 20px;
}

h2 {
    font-size: 48px;
    font-weight: 600;
    margin-bottom: 30px;
}

h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 15px;
}

p {
    font-size: 17px;
    color: var(--secondary-color);
}

/* Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
}

nav {
    height: 44px;
    display: flex;
    align-items: center;
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
    padding-top: calc(44px + var(--section-spacing));
    padding-bottom: var(--section-spacing);
    text-align: center;
    background: linear-gradient(to bottom, #f5f5f7 0%, #fff 100%);
}

.hero .subtitle {
    font-size: 28px;
    margin-bottom: 40px;
}

.app-store-button img {
    height: 44px;
    transition: transform 0.3s ease;
}

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

/* Product Section */
.product-section {
    padding: var(--section-spacing) 0;
    text-align: center;
}

.product-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 60px;
}

.feature {
    padding: 30px;
    background: #f5f5f7;
    border-radius: 18px;
    transition: transform 0.3s ease;
}

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

/* About Section */
.about-section {
    padding: var(--section-spacing) 0;
    background-color: #f5f5f7;
}

/* Vision Section */
.vision-section {
    padding: var(--section-spacing) 0;
    text-align: center;
}

/* Footer */
footer {
    padding: 40px 0;
    background-color: #f5f5f7;
}

.company-info {
    text-align: center;
}

.company-info p {
    margin-bottom: 10px;
    font-size: 14px;
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 40px;
    }

    h2 {
        font-size: 32px;
    }

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

    .nav-links {
        gap: 15px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 32px;
    }

    .hero .subtitle {
        font-size: 20px;
    }

    .nav-links a {
        font-size: 12px;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero, .product-section, .about-section, .vision-section {
    animation: fadeIn 1s ease-out;
}