/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    color: #1e293b; background: #fff; line-height: 1.7; font-size: 16px;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ===== Layout ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(15, 23, 42, 0.95); backdrop-filter: blur(8px);
}
.header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}
.logo {
    font-size: 20px; font-weight: 700; color: #fff; letter-spacing: 2px;
}
.logo-icon {
    width: 28px; height: 28px; border-radius: 4px;
    display: inline; vertical-align: middle; margin-right: 8px;
}
.nav { display: flex; gap: 32px; }
.nav-link {
    color: #94a3b8; font-size: 14px; font-weight: 500;
    transition: color 0.2s; letter-spacing: 0.5px;
}
.nav-link:hover, .nav-link.active { color: #fff; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span {
    display: block; width: 20px; height: 2px; background: #fff;
    margin: 4px 0; transition: 0.3s;
}

/* ===== Hero ===== */
.hero {
    padding: 160px 0 100px;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%);
    color: #fff;
}
.hero h1 { font-size: 48px; font-weight: 700; line-height: 1.3; margin-bottom: 24px; }
.hero-sub { font-size: 18px; color: #94a3b8; max-width: 600px; margin-bottom: 40px; line-height: 1.8; }

/* ===== Buttons ===== */
.btn {
    display: inline-block; padding: 14px 32px;
    background: #2563eb; color: #fff; border-radius: 8px;
    font-size: 15px; font-weight: 500; transition: background 0.2s;
}
.btn:hover { background: #1d4ed8; }
.btn-outline {
    background: transparent; border: 1px solid #2563eb; color: #2563eb;
}
.btn-outline:hover { background: #2563eb; color: #fff; }

/* ===== Sections ===== */
.section { padding: 80px 0; }
.section-alt { background: #f8fafc; }
.section-title {
    font-size: 32px; font-weight: 700; margin-bottom: 8px;
    color: #0f172a;
}
.section-sub { color: #64748b; margin-bottom: 48px; font-size: 16px; }
.page-header {
    padding: 140px 0 40px;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%);
    color: #fff;
}
.page-header h1 { font-size: 36px; }
.page-header p { color: #94a3b8; margin-top: 8px; }

/* ===== Product Grid ===== */
.product-grid {
    display: grid; grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.product-card {
    background: #fff; border: 1px solid #e2e8f0; border-radius: 12px;
    padding: 32px; transition: box-shadow 0.2s;
}
.product-card:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.08); }
.product-card.featured { border-color: #2563eb; border-width: 2px; }
.product-icon { font-size: 36px; margin-bottom: 16px; }
.product-card h3 { font-size: 20px; margin-bottom: 4px; }
.product-card h3 .en { font-size: 13px; color: #64748b; font-weight: 400; margin-left: 6px; }
.product-desc { color: #64748b; font-size: 14px; margin-bottom: 16px; }
.product-card ul { margin-bottom: 20px; }
.product-card li {
    font-size: 14px; color: #475569; padding: 4px 0 4px 18px;
    position: relative;
}
.product-card li::before {
    content: ''; position: absolute; left: 0; top: 12px;
    width: 6px; height: 6px; background: #2563eb; border-radius: 50%;
}
.product-tags { display: flex; gap: 8px; margin-bottom: 20px; flex-wrap: wrap; }
.product-tags span {
    font-size: 12px; padding: 4px 12px; background: #f1f5f9;
    border-radius: 20px; color: #475569;
}

/* ===== About ===== */
.about-content { max-width: 700px; }
.about-content p { margin-bottom: 16px; color: #475569; }

/* ===== CTA ===== */
.cta-section {
    background: linear-gradient(135deg, #2563eb, #1d4ed8); color: #fff;
}
.cta-section h2 { margin-bottom: 12px; }
.cta-section p { margin-bottom: 24px; color: #bfdbfe; }
.cta-section .btn { background: #fff; color: #2563eb; }
.cta-section .btn:hover { background: #f1f5f9; }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.contact-card {
    background: #f8fafc; border-radius: 12px; padding: 32px;
}
.contact-card h3 { margin-bottom: 16px; font-size: 18px; }
.contact-card a { color: #2563eb; }
.info-table { width: 100%; }
.info-table th {
    text-align: left; padding: 8px 16px 8px 0; font-weight: 500;
    color: #64748b; font-size: 14px; white-space: nowrap;
}
.info-table td { padding: 8px 0; font-size: 14px; }

/* ===== Prose ===== */
.prose h3 { margin: 32px 0 12px; font-size: 18px; }
.prose p { margin-bottom: 12px; color: #475569; }
.prose ul { margin-bottom: 16px; padding-left: 20px; }
.prose li { list-style: disc; color: #475569; margin-bottom: 4px; font-size: 14px; }
.prose a { color: #2563eb; }

/* ===== Footer ===== */
.footer { background: #0f172a; color: #94a3b8; padding: 60px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 14px; }
.footer-links h4, .footer-contact h4, .footer-info h4 { color: #fff; font-size: 14px; margin-bottom: 16px; }
.footer-links a { display: block; font-size: 14px; margin-bottom: 8px; transition: color 0.2s; }
.footer-links a:hover { color: #fff; }
.footer-contact p { font-size: 14px; }
.footer-contact a { color: #94a3b8; transition: color 0.2s; }
.footer-contact a:hover { color: #fff; }
.footer-info p { font-size: 14px; margin-bottom: 4px; }
.footer-bottom { border-top: 1px solid #1e293b; padding-top: 24px; font-size: 13px; }

/* ===== Mobile ===== */
@media (max-width: 768px) {
    .hero h1 { font-size: 32px; }
    .hero-sub { font-size: 16px; }
    .product-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .nav {
        display: none; position: absolute; top: 64px; left: 0; right: 0;
        background: #0f172a; flex-direction: column; padding: 16px 24px;
    }
    .nav.open { display: flex; }
    .nav-toggle { display: block; }
    .section-title { font-size: 26px; }
}