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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #1a1a1a;
    background-color: #fafafa;
    line-height: 1.7;
}

/* Layout */
.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Hero */
.hero {
    padding: 160px 0 120px;
    text-align: center;
}

.company-name {
    font-size: 3.2rem;
    font-weight: 600;
    letter-spacing: -0.03em;
    color: #1a1a1a;
    margin-bottom: 16px;
}

.tagline {
    font-size: 1.25rem;
    font-weight: 300;
    color: #555;
    letter-spacing: -0.01em;
}

/* About */
.about {
    padding: 80px 0;
    border-top: 1px solid #e5e5e5;
}

.about-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: #333;
    max-width: 600px;
}

/* Section Titles */
.section-title {
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: #999;
    margin-bottom: 32px;
}

/* Product */
.product {
    padding: 80px 0;
    border-top: 1px solid #e5e5e5;
}

.product-card {
    border: 1px solid #e5e5e5;
    border-radius: 12px;
    padding: 36px;
    background: #ffffff;
}

.product-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.product-name {
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: #1a1a1a;
}

.badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #3b82f6;
    background: #eff6ff;
    padding: 4px 10px;
    border-radius: 100px;
}

.product-description {
    font-size: 1rem;
    color: #555;
    margin-bottom: 24px;
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    font-size: 0.95rem;
    color: #444;
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
    border-bottom: 1px solid #f0f0f0;
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #3b82f6;
    opacity: 0.5;
}

/* Contact */
.contact {
    padding: 80px 0;
    border-top: 1px solid #e5e5e5;
}

.contact-text {
    font-size: 1.05rem;
    color: #333;
}

.contact-text a {
    color: #3b82f6;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.contact-text a:hover {
    border-bottom-color: #3b82f6;
}

/* Footer */
.footer {
    padding: 48px 0;
    border-top: 1px solid #e5e5e5;
}

.footer p {
    font-size: 0.85rem;
    color: #999;
}

/* Responsive */
@media (max-width: 640px) {
    .hero {
        padding: 100px 0 80px;
    }

    .company-name {
        font-size: 2.4rem;
    }

    .tagline {
        font-size: 1.1rem;
    }

    .about, .product, .contact {
        padding: 60px 0;
    }

    .product-card {
        padding: 24px;
    }

    .product-name {
        font-size: 1.2rem;
    }
}