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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: #1A1A1A;
    background-color: #FAFAFA;
    font-size: 17px;
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Nav */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(250, 250, 250, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid #E5E7EB;
    z-index: 100;
}

.nav-inner {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: 18px;
    font-weight: 700;
    color: #1A1A1A;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: #6B7280;
    text-decoration: none;
    font-size: 15px;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: #1A1A1A;
}

/* Hero */
.hero {
    padding: 160px 0 80px;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.hero-sub {
    margin-top: 16px;
    font-size: 19px;
    color: #6B7280;
    max-width: 500px;
}

/* Products */
.products {
    padding: 80px 0;
}

.products h2 {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #6B7280;
    margin-bottom: 32px;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.product-card {
    display: block;
    background: #FFFFFF;
    border: 1px solid #E5E7EB;
    border-radius: 12px;
    padding: 32px;
    text-decoration: none;
    color: inherit;
    transition: box-shadow 0.2s, transform 0.2s;
}

.product-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.product-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}

.product-card p {
    color: #6B7280;
    font-size: 15px;
    margin-bottom: 16px;
}

.product-link {
    font-size: 14px;
    color: #2563EB;
    font-weight: 500;
}

/* About */
.about {
    padding: 80px 0;
}

.about h2 {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #6B7280;
    margin-bottom: 16px;
}

.about p {
    font-size: 17px;
    color: #6B7280;
    max-width: 600px;
    line-height: 1.7;
}

/* Footer */
.footer {
    padding: 40px 0;
    border-top: 1px solid #E5E7EB;
}

.footer p {
    font-size: 13px;
    color: #9CA3AF;
    line-height: 1.8;
}

/* Desktop */
@media (min-width: 768px) {
    .hero {
        padding: 200px 0 120px;
    }

    .hero h1 {
        font-size: 64px;
    }
}