/* =============================================
   Oak Theme v2.0 — Apple Newsroom Style
   ============================================= */

/* ----- 1. CSS Variables ----- */
:root {
    --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

    --color-bg: #ffffff;
    --color-text: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-text-tertiary: #86868b;
    --color-border: #d2d2d7;
    --color-surface: #f5f5f7;
    --color-surface-hover: #e8e8ed;
    --color-accent: #0071e3;
    --color-code-bg: #f5f5f7;

    --max-width: 1200px;
    --content-width: 720px;
    --grid-gap: 32px;
    --section-padding: 64px;
    --header-height: 52px;
    --radius-card: 12px;
    --radius-img: 12px;
}

/* ----- 2. Reset & Base ----- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font-sans);
    font-weight: 400;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; }

/* ----- 3. Header ----- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(210, 210, 215, 0.5);
}

.site-header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.site-logo {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
    white-space: nowrap;
    flex-shrink: 0;
}

.site-logo img { height: 28px; width: auto; }

.site-nav {
    overflow-x: auto;
    flex-shrink: 1;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.site-nav::-webkit-scrollbar { display: none; }

.site-nav .nav {
    display: flex;
    list-style: none;
    gap: 4px;
    white-space: nowrap;
    flex-wrap: nowrap;
}

.site-nav .nav li { list-style: none; }

.site-nav .nav a {
    font-size: 0.8125rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    padding: 6px 10px;
    border-radius: 6px;
    transition: color 0.15s, background 0.15s;
    display: block;
}

.site-nav .nav a:hover {
    color: var(--color-text);
    background: var(--color-surface);
}

/* ----- 4. Tag Navigation (카테고리 탭) ----- */
.tag-nav {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    position: sticky;
    top: var(--header-height);
    z-index: 90;
}

.tag-nav-scroll {
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}

.tag-nav-scroll::-webkit-scrollbar { display: none; }

.tag-nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    gap: 4px;
    overflow: visible;
    white-space: nowrap;
    flex-wrap: nowrap;
}

.tag-nav-item {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    padding: 12px 14px;
    border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
    white-space: nowrap;
    flex-shrink: 0;
}

.tag-nav-item:hover {
    color: var(--color-text);
}

.tag-nav-item.active {
    color: var(--color-text);
    font-weight: 600;
    border-bottom-color: var(--color-text);
}


/* ----- 4-1. Dropdown Tag Nav ----- */
.tag-nav-dropdown {
    position: relative;
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
}

.tag-nav-parent {
    cursor: pointer;
    user-select: none;
}

.tag-nav-submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    z-index: 200;
    min-width: 140px;
    padding: 6px 0;
}

.tag-nav-dropdown:hover .tag-nav-submenu {
    display: block;
}

.tag-nav-subitem {
    display: block;
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    padding: 8px 16px;
    white-space: nowrap;
    transition: color 0.15s, background 0.15s;
}

.tag-nav-subitem:hover {
    color: var(--color-text);
    background: var(--color-surface);
}

.tag-nav-subitem.active {
    color: var(--color-text);
    font-weight: 600;
}

/* ----- 5. Site Container ----- */
.site-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.site-main { min-height: 60vh; }

/* ----- 5. Hero Card ----- */
.hero-section {
    padding: var(--section-padding) 0 0;
    max-width: var(--max-width);
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
}

.hero-card { border-radius: var(--radius-card); overflow: hidden; }

.hero-card-link {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    align-items: stretch;
    color: var(--color-text);
    background: var(--color-surface);
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: box-shadow 0.3s;
}

.hero-card-link:hover {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

.hero-card-image {
    aspect-ratio: 4 / 3;
    overflow: hidden;
}

.hero-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.hero-card-link:hover .hero-card-image img {
    transform: scale(1.03);
}

.hero-card-image--no-image {
    width: 100%;
    height: 100%;
    background: var(--color-surface-hover);
    min-height: 360px;
}

.hero-card-content {
    padding: 48px 48px 48px 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 16px;
}

.hero-card-image--no-image ~ .hero-card-content .hero-card-title {
    font-size: 2.5rem;
}

.hero-card-tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.hero-card-title {
    font-size: 1.875rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.03em;
    color: var(--color-text);
}

.hero-card-excerpt {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.hero-card-meta {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: auto;
    padding-top: 8px;
}

.hero-card-meta-dot { opacity: 0.5; }

/* ----- 6. Post Grid ----- */
.post-grid-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--section-padding) 24px;
}

.post-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--grid-gap);
}

/* ----- 7. Grid Cards ----- */
.grid-card { border-radius: var(--radius-card); overflow: hidden; }

.grid-card-link {
    display: flex;
    flex-direction: column;
    height: 100%;
    color: var(--color-text);
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: box-shadow 0.3s;
}

.grid-card-link:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.grid-card-image {
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--color-surface);
    border-radius: var(--radius-img) var(--radius-img) 0 0;
}

.grid-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.grid-card-link:hover .grid-card-image img {
    transform: scale(1.05);
}

.grid-card-image--no-image {
    width: 100%;
    height: 100%;
    background: var(--color-surface-hover);
}

.grid-card-content {
    padding: 20px 0 8px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.grid-card-tag {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.grid-card-title {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.35;
    letter-spacing: -0.015em;
    color: var(--color-text);
    transition: color 0.15s;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.grid-card-link:hover .grid-card-title {
    color: var(--color-text-secondary);
}

.grid-card-meta {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    display: flex;
    align-items: center;
    gap: 5px;
    margin-top: auto;
}

.grid-card-meta-dot { opacity: 0.5; }

/* ----- 8. Pagination ----- */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    padding: 48px 0 0;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.pagination a {
    color: var(--color-text);
    border: 1px solid var(--color-border);
    padding: 8px 20px;
    border-radius: 20px;
    transition: border-color 0.15s, background 0.15s;
}

.pagination a:hover {
    border-color: var(--color-text);
    background: var(--color-surface);
}

.page-number { color: var(--color-text-tertiary); }

/* ----- 9. Post Full (Single Post) ----- */
.post-hero-image {
    width: 100%;
    max-height: 560px;
    overflow: hidden;
    background: var(--color-surface);
}

.post-hero-image img {
    width: 100%;
    height: 100%;
    max-height: 560px;
    object-fit: cover;
}

.post-full-container {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 56px 24px 80px;
}

.post-full-header {
    margin-bottom: 40px;
}

.post-full-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 16px;
}

.post-full-tag:hover { text-decoration: underline; }

.post-full-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.03em;
    color: var(--color-text);
    margin-bottom: 20px;
}

.post-full-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    flex-wrap: wrap;
}

.post-full-author {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text);
    font-weight: 500;
}

.post-full-author:hover { color: var(--color-text-secondary); }

.author-avatar-sm {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
}

.dot { color: var(--color-text-tertiary); opacity: 0.5; }

/* ----- 10. Post Content (gh-content) ----- */
.gh-content > * + * { margin-top: 1.5em; }

.gh-content h1,
.gh-content h2,
.gh-content h3,
.gh-content h4,
.gh-content h5,
.gh-content h6 {
    font-family: var(--font-sans);
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-text);
    letter-spacing: -0.02em;
    margin-top: 2.5em;
    margin-bottom: 0.6em;
}

.gh-content h2 { font-size: 1.75rem; }
.gh-content h3 { font-size: 1.375rem; }
.gh-content h4 { font-size: 1.125rem; }

.gh-content p {
    font-size: 1.0625rem;
    line-height: 1.85;
    color: var(--color-text);
}

.gh-content a {
    color: var(--color-accent);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
    transition: opacity 0.15s;
}

.gh-content a:hover { opacity: 0.75; }

.gh-content strong { font-weight: 700; }
.gh-content em { font-style: italic; }

.gh-content ul,
.gh-content ol {
    padding-left: 1.5em;
    line-height: 1.85;
    font-size: 1.0625rem;
}

.gh-content li { margin-bottom: 0.4em; }

.gh-content blockquote {
    border-left: 3px solid var(--color-text);
    padding: 4px 0 4px 20px;
    margin-left: 0;
    color: var(--color-text-secondary);
    font-style: italic;
}

.gh-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--color-text);
}

.gh-content pre {
    background: var(--color-code-bg);
    padding: 20px 24px;
    border-radius: 10px;
    overflow-x: auto;
    font-size: 0.875rem;
    border: 1px solid var(--color-border);
}

.gh-content pre code {
    background: none;
    padding: 0;
    font-size: inherit;
}

.gh-content figure { margin: 2.5em 0; }

.gh-content figcaption {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    text-align: center;
    margin-top: 10px;
    line-height: 1.5;
}

.gh-content img { border-radius: 10px; }

.gh-content hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 3em auto;
    width: 50%;
}

.gh-content table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

.gh-content th,
.gh-content td {
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    text-align: left;
}

.gh-content th {
    background: var(--color-surface);
    font-weight: 600;
}

/* ----- 11. Post Footer ----- */
.post-full-footer {
    margin-top: 56px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

.post-full-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 40px;
}

.tag-pill {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    padding: 5px 14px;
    border-radius: 20px;
    transition: border-color 0.15s, color 0.15s;
}

.tag-pill:hover {
    border-color: var(--color-text);
    color: var(--color-text);
}

/* ----- 12. Author Card ----- */
.author-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 24px 0;
}

.author-card-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.author-card-label {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    margin-bottom: 4px;
}

.author-card-name {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.author-card-name a { color: var(--color-text); }
.author-card-name a:hover { color: var(--color-text-secondary); }

.author-card-bio {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ----- 13. Post Navigation ----- */
.post-navigation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

.post-nav-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 16px 20px;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    transition: border-color 0.15s, background 0.15s;
}

.post-nav-item:hover {
    border-color: var(--color-text-secondary);
    background: var(--color-surface);
}

.post-nav-next { text-align: right; }

.post-nav-label {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

.post-nav-title {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ----- 14. Archive (Tag / Author) ----- */
.archive-header {
    padding: var(--section-padding) 0 48px;
    text-align: center;
}

.archive-header--author { padding-top: 56px; }

.archive-author-avatar {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 20px;
}

.archive-title {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--color-text);
    margin-bottom: 12px;
}

.archive-description {
    font-size: 1rem;
    color: var(--color-text-secondary);
    max-width: 540px;
    margin: 0 auto 12px;
    line-height: 1.6;
}

.archive-count {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

/* ----- 15. Footer ----- */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 32px 24px;
    margin-top: 80px;
}

.site-footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.site-footer-name {
    font-weight: 600;
    color: var(--color-text-secondary);
    transition: color 0.15s;
}

.site-footer-name:hover { color: var(--color-text); }

/* ----- 16. Ghost Koenig Card Classes (필수) ----- */
.kg-width-wide {
    width: 85vw;
    max-width: 1100px;
    margin-left: calc(50% - 42.5vw);
    margin-right: calc(50% - 42.5vw);
}

.kg-width-full {
    width: 100vw;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
}

.kg-image-card img { width: 100%; border-radius: 10px; }

.kg-gallery-container { display: flex; flex-direction: column; gap: 8px; }
.kg-gallery-row { display: flex; gap: 8px; }
.kg-gallery-image img { width: 100%; height: 100%; object-fit: cover; border-radius: 6px; }

.kg-bookmark-card {
    border: 1px solid var(--color-border);
    border-radius: 10px;
    overflow: hidden;
}

.kg-bookmark-container {
    display: flex;
    text-decoration: none;
    color: inherit;
}

.kg-bookmark-content { padding: 16px 20px; flex: 1; min-width: 0; }
.kg-bookmark-title { font-weight: 600; font-size: 0.9375rem; margin-bottom: 6px; line-height: 1.4; }
.kg-bookmark-description { font-size: 0.8125rem; color: var(--color-text-secondary); line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.kg-bookmark-thumbnail { flex-shrink: 0; }
.kg-bookmark-thumbnail img { width: 160px; height: 100%; object-fit: cover; }

.kg-video-card video { width: 100%; border-radius: 10px; }

.kg-callout-card {
    display: flex;
    gap: 14px;
    padding: 20px 24px;
    border-radius: 10px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
}

.kg-callout-emoji { font-size: 1.25rem; flex-shrink: 0; }

.kg-toggle-card {
    border: 1px solid var(--color-border);
    border-radius: 10px;
    overflow: hidden;
}

.kg-toggle-heading {
    font-weight: 600;
    cursor: pointer;
    padding: 14px 20px;
    user-select: none;
}

.kg-toggle-content { padding: 0 20px 16px; }

.kg-button-card { text-align: center; margin: 1.5em 0; }

.kg-button-card a {
    display: inline-block;
    padding: 12px 28px;
    background: var(--color-text);
    color: #fff;
    border-radius: 8px;
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    transition: opacity 0.15s;
}

.kg-button-card a:hover { opacity: 0.8; }

.kg-audio-card {
    border: 1px solid var(--color-border);
    border-radius: 10px;
    overflow: hidden;
    padding: 16px;
    background: var(--color-surface);
}

.kg-product-card {
    border: 1px solid var(--color-border);
    border-radius: 10px;
    overflow: hidden;
    padding: 20px;
}

/* ----- 17. Responsive ----- */
@media (max-width: 1024px) {
    :root {
        --section-padding: 48px;
        --grid-gap: 24px;
    }

    .post-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-card-content { padding: 36px 32px; }
    .hero-card-title { font-size: 1.625rem; }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 40px;
        --grid-gap: 20px;
    }

    .hero-card-link {
        grid-template-columns: 1fr;
    }

    .hero-card-image {
        aspect-ratio: 16 / 9;
    }

    .hero-card-content {
        padding: 24px 20px 28px;
        gap: 12px;
    }

    .hero-card-title { font-size: 1.5rem; }
    .hero-card-excerpt { -webkit-line-clamp: 2; }

    .post-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .post-full-title { font-size: 1.875rem; }

    .post-navigation { grid-template-columns: 1fr; }

    .archive-title { font-size: 1.75rem; }

    .site-footer-inner { flex-direction: column; gap: 6px; }
}

@media (max-width: 640px) {
    .site-container,
    .hero-section,
    .post-grid-section { padding-left: 16px; padding-right: 16px; }

    .post-grid {
        grid-template-columns: 1fr;
    }

    .post-full-container { padding: 40px 16px 60px; }

    .post-full-title { font-size: 1.625rem; }

    .kg-width-wide {
        width: 100vw;
        margin-left: calc(50% - 50vw);
        margin-right: calc(50% - 50vw);
    }

    .post-navigation { gap: 10px; }

    .site-footer { padding: 24px 16px; }
}