:root {
    --color-bg: #ffffff;
    --color-surface: #f4f6fa;
    --color-border: #e3e7ee;
    --color-text: #16181d;
    --color-text-muted: #666d7a;
    --color-primary: #5b5bf0;
    --color-primary-dark: #4342c9;
    --color-accent: #22c3a6;
    --color-ink: #0d1117;
    --color-ink-soft: #161b22;
    --color-ink-border: #262c36;
    --font-sans: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Noto Sans KR", "Malgun Gothic", sans-serif;
    --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
    --radius: 12px;
    --max-width: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; text-decoration: none; }

.wrap {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.screen-reader-text {
    position: absolute;
    clip: rect(1px, 1px, 1px, 1px);
    overflow: hidden;
    height: 1px; width: 1px;
}

.skip-link:focus {
    position: fixed;
    top: 10px; left: 10px;
    background: var(--color-primary);
    color: #fff;
    padding: 10px 16px;
    border-radius: 8px;
    z-index: 1000;
    height: auto; width: auto; clip: auto;
}

/* Header — dark, terminal-adjacent */
.site-header {
    position: sticky;
    top: 0;
    background: var(--color-ink);
    border-bottom: 1px solid var(--color-ink-border);
    z-index: 100;
}

.site-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 16px 20px;
    flex-wrap: wrap;
}

.site-branding .site-title {
    display: inline-flex;
    align-items: baseline;
    gap: 8px;
    font-size: 1.35rem;
    font-weight: 800;
    color: #fff;
}

.site-title-mark {
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--color-accent);
    font-size: 1rem;
}

.site-branding .site-description {
    margin: 2px 0 0;
    font-size: 0.78rem;
    color: #9aa4b2;
    font-family: var(--font-mono);
}

.primary-nav {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

.primary-nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

.primary-nav a {
    font-weight: 600;
    font-size: 0.92rem;
    color: #c4cad4;
}

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

.header-search {
    display: flex;
    align-items: center;
    background: var(--color-ink-soft);
    border: 1px solid var(--color-ink-border);
    border-radius: 999px;
    padding: 6px 6px 6px 14px;
}

.header-search input {
    border: none;
    background: transparent;
    outline: none;
    font-size: 0.88rem;
    width: 160px;
    color: #fff;
}

.header-search input::placeholder { color: #6b7280; }

.header-search button {
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 0.9rem;
    padding: 4px 8px;
    filter: grayscale(1) brightness(1.6);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}

.nav-toggle span {
    width: 22px; height: 2px;
    background: #fff;
    border-radius: 2px;
}

/* Hero */
.hero-post {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 32px;
    align-items: center;
    margin: 32px 0 48px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--color-border);
}

.hero-post-media img {
    border-radius: var(--radius);
    aspect-ratio: 16/10;
    object-fit: cover;
}

.hero-post-title {
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    line-height: 1.3;
    margin: 12px 0;
}

.hero-post-excerpt {
    color: var(--color-text-muted);
    margin: 0 0 12px;
}

.section-title {
    font-family: var(--font-mono);
    font-size: 1.05rem;
    font-weight: 700;
    margin: 40px 0 20px;
    padding-left: 14px;
    border-left: 3px solid var(--color-primary);
    color: var(--color-text-muted);
}

.section-title::before {
    content: "// ";
    color: var(--color-primary);
}

/* Post grid */
.post-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
    margin: 20px 0 40px;
}

.post-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
    background: var(--color-bg);
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(20, 30, 60, 0.08);
    border-color: var(--color-primary);
}

.post-card-media img {
    aspect-ratio: 16/10;
    object-fit: cover;
}

.post-card-body { padding: 18px; }

.post-card-title {
    font-size: 1.05rem;
    margin: 8px 0;
    line-height: 1.45;
}

.post-card-excerpt {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin: 0 0 10px;
}

.category-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: color-mix(in srgb, var(--color-primary) 10%, white);
    color: var(--color-primary-dark);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 6px;
}

.category-badge::before { content: "#"; opacity: 0.6; }

.post-meta {
    font-size: 0.78rem;
    font-family: var(--font-mono);
    color: var(--color-text-muted);
}

/* Single post */
.has-sidebar {
    display: grid;
    grid-template-columns: 2.4fr 1fr;
    gap: 48px;
    align-items: start;
}

.single-post-title {
    font-size: clamp(1.5rem, 3vw, 2.1rem);
    line-height: 1.35;
    margin: 14px 0;
}

.single-post-media img {
    border-radius: var(--radius);
    margin: 20px 0;
}

.single-post-content {
    font-size: 1.05rem;
}

.single-post-content h2,
.single-post-content h3 { margin-top: 2em; }

.single-post-content img { border-radius: var(--radius); }

.single-post-content blockquote {
    border-left: 3px solid var(--color-accent);
    margin: 24px 0;
    padding: 4px 20px;
    color: var(--color-text-muted);
    font-style: italic;
}

.single-post-content code {
    font-family: var(--font-mono);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

.single-post-content pre {
    background: var(--color-ink);
    border: 1px solid var(--color-ink-border);
    border-radius: var(--radius);
    padding: 18px 20px;
    overflow-x: auto;
    margin: 24px 0;
}

.single-post-content pre code {
    background: none;
    border: none;
    padding: 0;
    color: #e6edf3;
    font-size: 0.9rem;
    line-height: 1.6;
}

.single-post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 0.95rem;
}

.single-post-content th,
.single-post-content td {
    border: 1px solid var(--color-border);
    padding: 8px 12px;
    text-align: left;
}

.single-post-content th {
    background: var(--color-surface);
    font-family: var(--font-mono);
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 32px 0;
}

.tag-badge {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    padding: 6px 14px;
    font-size: 0.82rem;
    font-family: var(--font-mono);
}

.sidebar .widget {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
}

.widget-title {
    margin: 0 0 14px;
    font-size: 0.95rem;
    font-family: var(--font-mono);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 40px 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.pagination .page-numbers {
    padding: 8px 14px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.pagination .current {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

/* No results / 404 */
.no-results {
    text-align: center;
    padding: 60px 20px;
}

.no-results h1 {
    font-family: var(--font-mono);
    font-size: 3rem;
    color: var(--color-primary);
    margin: 0;
}

.button {
    display: inline-block;
    margin-top: 20px;
    background: var(--color-primary);
    color: #fff;
    padding: 10px 22px;
    border-radius: 999px;
    font-weight: 600;
}

.search-form {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 16px 0;
}

.search-form input {
    padding: 10px 16px;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    min-width: 240px;
}

.search-form button {
    padding: 10px 18px;
    border-radius: 999px;
    border: none;
    background: var(--color-primary);
    color: #fff;
    cursor: pointer;
}

/* Footer — dark to bookend the header */
.site-footer {
    background: var(--color-ink);
    margin-top: 60px;
    color: #9aa4b2;
}

.site-footer-inner {
    padding: 40px 20px;
    text-align: center;
}

.site-footer .site-title {
    font-weight: 800;
    font-size: 1.05rem;
    color: #fff;
}

.footer-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 18px;
    margin: 16px 0;
    padding: 0;
    font-size: 0.88rem;
}

.footer-nav a { color: #9aa4b2; }
.footer-nav a:hover { color: var(--color-accent); }

.site-copyright {
    font-size: 0.78rem;
    font-family: var(--font-mono);
    margin: 0;
    color: #6b7280;
}

/* Responsive */
@media (max-width: 860px) {
    .hero-post { grid-template-columns: 1fr; }
    .has-sidebar { grid-template-columns: 1fr; }

    .nav-toggle { display: flex; }

    .primary-nav {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        padding-top: 16px;
    }

    .primary-nav.is-open { display: flex; }

    .primary-nav ul {
        flex-direction: column;
        gap: 12px;
    }

    .header-search { width: 100%; }
    .header-search input { flex: 1; width: auto; }
}