/* Base */
* {
    box-sizing: border-box;
}
html,
body {
    margin: 0;
    padding: 0;
}
body {
    font-family: system-ui, -apple-system, Segoe UI, Roboto, "Noto Sans KR",
        Arial, sans-serif;
    color: #111827;
    background: #ffffff;
    line-height: 1.6;
}
a {
    color: inherit;
    text-decoration: none;
}
img {
    max-width: 100%;
    display: block;
}

/* Layout */
.container {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 16px;
}

.site-header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: saturate(180%) blur(10px);
    border-bottom: 1px solid #e5e7eb;
    z-index: 10;
}
.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.brand {
    font-weight: 700;
    letter-spacing: -0.2px;
}
.site-nav {
    display: flex;
    gap: 16px;
    align-items: center;
}
.site-nav a {
    padding: 8px 10px;
    border-radius: 8px;
    color: #374151;
}
.site-nav a.active {
    color: #111827;
    font-weight: 600;
}
.site-nav .cta {
    background: #111827;
    color: #fff;
    padding: 10px 14px;
}

.hero {
    padding: 72px 0;
    background: linear-gradient(180deg, #f9fafb, #ffffff);
}
.hero h1 {
    font-size: 40px;
    margin: 0 0 8px;
    letter-spacing: -0.5px;
}
.hero p {
    margin: 0 0 20px;
    color: #4b5563;
}
.hero-actions {
    display: flex;
    gap: 12px;
}

.btn {
    display: inline-block;
    padding: 10px 16px;
    border-radius: 10px;
    border: 1px solid #d1d5db;
    background: #fff;
    color: #111827;
}
.btn.primary {
    background: #111827;
    color: #fff;
    border-color: #111827;
}

.features {
    padding: 40px 0;
}
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}
.card {
    padding: 20px;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    background: #fff;
}
.card h3 {
    margin: 0 0 8px;
}
.card p {
    margin: 0;
    color: #4b5563;
}

.cta-section {
    padding: 48px 0;
    text-align: center;
    background: #f9fafb;
}
.cta-section h2 {
    margin: 0 0 8px;
}
.cta-section p {
    margin: 0 0 16px;
    color: #4b5563;
}

.page-hero {
    padding: 56px 0 24px;
    background: #f9fafb;
    border-bottom: 1px solid #e5e7eb;
}

.prose {
    padding: 24px 0 48px;
}
.prose h2 {
    margin-top: 28px;
    margin-bottom: 8px;
}
.prose p {
    margin: 0 0 8px;
    color: #374151;
}
.prose ol,
.prose ul {
    padding-left: 20px;
    color: #374151;
}
.tags {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 0;
}
.tags li {
    background: #eef2ff;
    color: #3730a3;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 14px;
}

.site-footer {
    border-top: 1px solid #e5e7eb;
    padding: 20px 0;
    background: #ffffff;
}
.footer-grid {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.footer-links {
    display: flex;
    gap: 12px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 28px;
    }
    .grid-3 {
        grid-template-columns: 1fr;
    }
    .site-header .container,
    .footer-grid {
        flex-direction: column;
        align-items: flex-start;
        height: auto;
        gap: 8px;
        padding: 12px 16px;
    }
}