:root {
    color-scheme: light;
    --gap: 24px;
    --content-gap: 20px;
    --nav-width: 1024px;
    --main-width: 720px;
    --header-height: 64px;
    --footer-height: 60px;
    --radius: 8px;
    --theme: #fff;
    --entry: #fff;
    --primary: #1e1e1e;
    --secondary: #6c6c6c;
    --tertiary: #d6d6d6;
    --content: #1f1f1f;
    --code-block-bg: #1c1d21;
    --code-bg: #f5f5f5;
    --border: #eee;
    --focus: #2563eb;
    --danger: #dc2626;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", Roboto, Helvetica, Arial, sans-serif;
    --mono: "SFMono-Regular", "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

html.dark {
    color-scheme: dark;
    --theme: #1d1e20;
    --entry: #2e2e33;
    --primary: #dadadb;
    --secondary: #9b9c9d;
    --tertiary: #414244;
    --content: #c4c4c5;
    --code-block-bg: #2e2e33;
    --code-bg: #37383e;
    --border: #333;
    --focus: #7ca7ff;
    --danger: #f87171;
}

*, *::before, *::after { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    margin: 0;
    color: var(--primary);
    background: var(--theme);
    font: 18px/1.6 var(--font);
    word-break: keep-all;
    overflow-wrap: anywhere;
    -webkit-font-smoothing: antialiased;
    -webkit-tap-highlight-color: transparent;
}

body.list { background: var(--code-bg); }
html.dark body.list { background: var(--theme); }

a { color: inherit; text-decoration: none; }
button, input, textarea { color: inherit; font: inherit; }
button { cursor: pointer; }
img { display: block; max-width: 100%; height: auto; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5, h6, p { margin-top: 0; }
table { width: 100%; border-collapse: collapse; }

:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 3px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.header { background: transparent; }

.nav {
    display: flex;
    max-width: calc(var(--nav-width) + var(--gap) * 2);
    margin: auto;
    flex-wrap: wrap;
    justify-content: space-between;
    line-height: var(--header-height);
}

.logo, #menu {
    display: flex;
    margin: auto var(--gap);
}

.logo { align-items: center; flex-wrap: inherit; }

.logo a {
    display: block;
    color: var(--primary);
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -.025em;
}

.logo-switches { display: inline-flex; margin: auto 4px; }

#menu {
    overflow-x: auto;
    white-space: nowrap;
    word-break: keep-all;
}

#menu li + li { margin-left: var(--gap); }

#menu a {
    display: block;
    color: var(--primary);
    font-size: 16px;
}

#menu a:hover { color: var(--secondary); }

#menu a[aria-current="page"] {
    font-weight: 500;
    border-bottom: 2px solid currentColor;
}

#theme-toggle {
    display: inline-flex;
    margin: auto 4px;
    padding: 0;
    align-items: center;
    color: var(--primary);
    background: transparent;
    border: 0;
    line-height: 0;
}

#theme-toggle svg { width: 24px; height: 18px; stroke-width: 2; }
html.dark #moon, html:not(.dark) #sun { display: none; }

.main {
    position: relative;
    width: min(100%, calc(var(--main-width) + var(--gap) * 2));
    min-height: calc(100vh - var(--header-height) - var(--footer-height));
    margin: auto;
    padding: var(--gap);
}

.page-header p {
    margin: 0;
    color: var(--secondary);
    font-size: 14px;
}

.post-entry {
    position: relative;
    margin-bottom: var(--gap);
    padding: var(--gap);
    background: var(--entry);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color .15s, box-shadow .15s, transform .15s;
}

.first-entry {
    position: relative;
    display: flex;
    min-height: 280px;
    margin: var(--gap) 0 calc(var(--gap) * 2);
    flex-direction: column;
    justify-content: center;
}

.first-entry .entry-header h2 { transition: color .18s, transform .18s; }

.first-entry .entry-header h2 {
    font-size: 24px;
    line-height: 1.3;
}

.first-entry .entry-content {
    margin: 14px 0;
    font-size: 16px;
    -webkit-line-clamp: 3;
}

.first-entry .entry-footer { font-size: 14px; }

.entry-header h2 {
    margin: 0;
    font-size: 24px;
    line-height: 1.3;
    letter-spacing: -.02em;
}

.entry-content {
    display: -webkit-box;
    margin: 10px 0;
    overflow: hidden;
    color: var(--secondary);
    font-size: 14px;
    line-height: 1.6;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}

.entry-content p { margin: 0; }

.entry-footer {
    position: relative;
    z-index: 2;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 7px;
    color: var(--secondary);
    font-size: 13px;
}

.entry-tags { display: flex; flex-wrap: wrap; gap: 7px; }

.tag {
    padding: 1px 7px;
    background: var(--code-bg);
    border-radius: 5px;
    font-size: 12px;
}

.tag:hover { color: var(--primary); }

.entry-link {
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
}

.post-entry:active { transform: scale(.96); }

.post-entry:hover {
    border-color: var(--secondary);
    box-shadow: 0 8px 22px rgba(0, 0, 0, .08);
    transform: translateY(-3px);
}

.first-entry:hover .entry-header h2 {
    color: var(--secondary);
    transform: translateX(4px);
}

.page-header {
    display: flex;
    margin: 12px 0 var(--content-gap);
    align-items: baseline;
    justify-content: space-between;
}

.page-header h1 {
    margin: 0;
    font-size: 40px;
    line-height: 1.3;
    letter-spacing: -.03em;
}

.search-form {
    display: flex;
    margin-bottom: 18px;
    gap: 8px;
}

.search-form input {
    min-width: 0;
    width: 100%;
    padding: 12px 14px;
    color: var(--primary);
    background: var(--entry);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    outline: 0;
}

.search-form input:focus {
    border-color: var(--secondary);
    box-shadow: 0 0 0 2px var(--border);
}

.search-form button {
    flex: 0 0 auto;
    padding: 0 18px;
    color: var(--theme);
    background: var(--primary);
    border: 0;
    border-radius: var(--radius);
    font-size: 14px;
    white-space: nowrap;
}

.search-status {
    margin: 0 0 var(--gap);
    color: var(--secondary);
    font-size: 14px;
}

.archive-group {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: var(--gap);
    margin-bottom: 36px;
}

.archive-group h2 {
    margin: 4px 0 0;
    font-size: 24px;
}

.archive-group ol {
    margin: 0;
    padding: 0;
    list-style: none;
    border-top: 1px solid var(--border);
}

.archive-group li {
    display: grid;
    grid-template-columns: 105px 1fr;
    gap: 16px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.archive-group time {
    color: var(--secondary);
    font-size: 13px;
}

.archive-group a { line-height: 1.4; }
.archive-group a:hover { text-decoration: underline; text-underline-offset: 3px; }

.tag-list-page .post-entry { margin-bottom: 16px; }

.terms-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.terms-tags a {
    display: block;
    padding: 6px 12px;
    background: var(--tertiary);
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    transition: transform .1s;
}

.terms-tags a:hover { background: var(--border); }
.terms-tags a:active { transform: scale(.96); }

.back-link, .empty {
    margin-top: var(--gap);
    color: var(--secondary);
    font-size: 14px;
}

.back-link a { box-shadow: 0 1px 0 var(--secondary); }

.page-footer { margin-top: var(--gap); }

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.pagination > span {
    color: var(--secondary);
    font-size: 13px;
}

.pagination a {
    padding: 0 16px;
    color: var(--theme);
    background: var(--primary);
    border-radius: 18px;
    font-size: 13px;
    line-height: 36px;
}

.pagination .prev { margin-right: auto; }
.pagination .next { margin-left: auto; }

.reading-progress {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 100;
    height: 2px;
    background: var(--primary);
    transform: scaleX(0);
    transform-origin: left;
}

.post-header { margin: 24px 0 var(--content-gap); }

.breadcrumbs {
    display: flex;
    margin-bottom: 8px;
    gap: 6px;
    color: var(--secondary);
    font-size: 14px;
}

.breadcrumbs span:last-child {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.breadcrumbs a { box-shadow: 0 1px 0 var(--secondary); }

.post-title {
    margin: 0;
    font-size: 40px;
    line-height: 1.2;
    letter-spacing: -.035em;
}

.post-description {
    margin-top: 10px;
    color: var(--secondary);
    font-size: 16px;
}

.post-meta {
    display: flex;
    margin-top: 7px;
    gap: 8px;
    color: var(--secondary);
    font-size: 14px;
}

.toc {
    margin: 0 2px 40px;
    padding: 7px;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

html.dark .toc { background: var(--entry); }

.toc summary {
    margin-left: 10px;
    padding: 4px 0;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    user-select: none;
}

.toc .inner { margin: 5px 20px 0; padding: 0 10px 8px; }
.toc li { margin: 4px 0; color: var(--secondary); font-size: 14px; }
.toc-h3 { padding-left: var(--gap); }
.toc a:hover { color: var(--primary); text-decoration: underline; }
.toc a.current { color: var(--primary); font-weight: 600; }

.post-content { color: var(--content); }

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
    color: var(--primary);
    scroll-margin-top: 20px;
}

.post-content h1 { margin: 40px 0 32px; font-size: 34px; line-height: 1.25; }
.post-content h2 { margin: 40px 0 24px; font-size: 32px; line-height: 1.25; }
.post-content h3 { margin: 32px 0 20px; font-size: 26px; line-height: 1.3; }
.post-content h4 { margin: 24px 0 16px; font-size: 21px; }
.post-content h5 { margin: 20px 0 12px; font-size: 17px; }
.post-content h6 { margin: 16px 0 8px; font-size: 15px; }

.post-content p,
.post-content ul,
.post-content ol,
.post-content dl,
.post-content figure,
.post-content table,
.post-content blockquote { margin-bottom: var(--content-gap); }

.post-content ul, .post-content ol { padding-left: 22px; }
.post-content ul { list-style: disc; }
.post-content ol { list-style: decimal; }
.post-content li { margin-top: 5px; }
.post-content li > p { margin-bottom: 0; }

.post-content a {
    box-shadow: 0 1px 0;
    box-decoration-break: clone;
    -webkit-box-decoration-break: clone;
}

.post-content blockquote {
    margin-right: 0;
    margin-left: 0;
    padding: 0 14px;
    color: var(--secondary);
    border-left: 3px solid var(--primary);
}

.post-content hr { margin: 30px 0; border: 0; border-top: 2px solid var(--tertiary); }
.post-content img { margin: 1rem 0; border-radius: 4px; }

.post-content table { display: block; overflow-x: auto; }
.post-content th, .post-content td {
    min-width: 80px;
    padding: 8px 6px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    line-height: 1.5;
}

.post-content code {
    margin: 0 3px;
    padding: 3px 5px;
    background: var(--code-bg);
    border-radius: 3px;
    font: .8em/1.5 var(--mono);
}

.post-content pre, .post-content .highlight {
    position: relative;
    margin: 10px 0;
    direction: ltr;
}

.post-content pre code, .post-content .highlight pre code {
    display: block;
    margin: 0;
    padding: 12px;
    overflow-x: auto;
    color: #d5d5d6;
    background: var(--code-block-bg) !important;
    border-radius: var(--radius);
    font-size: 13px;
    line-height: 1.6;
    word-break: normal;
}

.copy-code {
    display: none;
    position: absolute;
    top: 4px;
    right: 4px;
    z-index: 2;
    padding: 2px 6px;
    color: #ddd;
    background: rgba(78, 78, 78, .85);
    border: 0;
    border-radius: 4px;
    font-size: 12px;
}

.post-content pre:hover .copy-code,
.post-content .highlight:hover .copy-code { display: block; }

.post-content .anchor {
    margin-left: 8px;
    color: var(--secondary);
    box-shadow: none;
    opacity: 0;
}

.post-content :is(h1, h2, h3, h4, h5, h6):hover .anchor { opacity: 1; }

.post-content .footnotes {
    margin-top: 32px;
    padding-top: 16px;
    color: var(--secondary);
    border-top: 1px solid var(--border);
    font-size: 14px;
}

.post-footer { margin-top: 56px; }
.post-footer > * { margin-bottom: 10px; }

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.post-tags a {
    display: block;
    padding: 0 14px;
    color: var(--secondary);
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    line-height: 34px;
}

html.dark .post-tags a { background: var(--entry); }
.post-tags a:hover { background: var(--border); }

.paginav {
    display: flex;
    margin-top: 24px;
    line-height: 1.5;
}

.paginav a {
    width: 50%;
    padding: 12px 14px;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

html.dark .paginav a { background: var(--entry); }
.paginav .next { margin-left: auto; text-align: right; }
.paginav .title { display: block; margin-bottom: 4px; color: var(--secondary); font-size: 12px; }
.paginav a:hover span:last-child { box-shadow: 0 1px 0; }

.footer {
    display: flex;
    width: min(100%, calc(var(--main-width) + var(--gap) * 2));
    margin: auto;
    padding: 18px var(--gap);
    justify-content: center;
    gap: 6px;
    color: var(--secondary);
    font-size: 12px;
    line-height: 24px;
}

.footer a { border-bottom: 1px solid var(--secondary); }

.top-link {
    visibility: hidden;
    position: fixed;
    right: 30px;
    bottom: 30px;
    z-index: 30;
    width: 42px;
    height: 42px;
    padding: 12px;
    color: var(--primary);
    background: var(--tertiary);
    border-radius: 50%;
    opacity: 0;
    transition: opacity .2s;
}

.top-link svg { display: block; width: 100%; height: 100%; }

.not-found { padding: 80px 0; text-align: center; }
.not-found h1 { margin: 0 0 8px; color: var(--secondary); font-size: 72px; line-height: 1; }
.not-found p { margin-bottom: 24px; color: var(--secondary); }

body.admin .main { width: min(100%, calc(1040px + var(--gap) * 2)); }
body.admin { background: var(--theme); }

.admin-header {
    display: flex;
    margin-bottom: var(--gap);
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.admin-header h1 { margin: 0; font-size: 32px; }
.admin-actions, .form-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }
.inline-form { margin: 0; }

.btn {
    display: inline-flex;
    padding: 8px 14px;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    background: var(--entry);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    line-height: 1.2;
}

.btn:hover { background: var(--code-bg); }
.btn.primary { color: var(--theme); background: var(--primary); border-color: var(--primary); }
.btn.primary:hover { opacity: .9; }
.btn.danger { color: var(--danger); border-color: var(--danger); }
.btn.danger:hover { color: #fff; background: var(--danger); }

.admin-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
.admin-table { min-width: 720px; background: var(--entry); font-size: 14px; }
.admin-table th, .admin-table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); }
.admin-table th { color: var(--secondary); background: var(--code-bg); font-weight: 500; }
.admin-table tr:last-child td { border-bottom: 0; }
.admin-table code { padding: 2px 5px; background: var(--code-bg); border-radius: 3px; font: .85em var(--mono); }
.admin-table .actions { white-space: nowrap; }
.admin-table .actions a { margin-right: 12px; box-shadow: 0 1px 0 var(--secondary); font-size: 13px; }

.badge { display: inline-block; padding: 2px 8px; border-radius: 6px; font-size: 12px; }
.badge.draft { color: #92400e; background: #fef3c7; }
.badge.published { color: #065f46; background: #d1fae5; }
html.dark .badge.draft { color: #fef3c7; background: #78350f; }
html.dark .badge.published { color: #d1fae5; background: #064e3b; }

.flash { margin-bottom: var(--gap); padding: 12px 16px; border-radius: var(--radius); font-size: 14px; }
.flash.success { color: #065f46; background: #d1fae5; }
.flash.error { color: #991b1b; background: #fee2e2; }
html.dark .flash.success { color: #d1fae5; background: #064e3b; }
html.dark .flash.error { color: #fee2e2; background: #7f1d1d; }

.login-box {
    max-width: 400px;
    margin: 48px auto;
    padding: var(--gap);
    background: var(--entry);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.login-box h1 { margin-bottom: 20px; font-size: 28px; }
.login-box form { display: grid; gap: 12px; }
.post-form .form-row { margin-bottom: 16px; }
.post-form label, .login-box label { display: block; margin-bottom: 6px; color: var(--secondary); font-size: 14px; }

.form-section {
    min-width: 0;
    margin: 0 0 var(--gap);
    padding: var(--gap);
    background: var(--entry);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.form-section legend {
    padding: 0 8px;
    color: var(--primary);
    font-size: 15px;
    font-weight: 600;
}

.post-form input[type="text"],
.post-form input[type="password"],
.post-form input[type="datetime-local"],
.post-form textarea,
.login-box input[type="password"] {
    width: 100%;
    padding: 10px 12px;
    color: var(--primary);
    background: var(--theme);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    outline: 0;
    font-size: 15px;
}

.post-form input:focus, .post-form textarea:focus, .login-box input:focus {
    border-color: var(--secondary);
    box-shadow: 0 0 0 2px var(--border);
}

.post-form textarea { min-height: 520px; resize: vertical; font: 14px/1.6 var(--mono); }
.post-form .two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.post-form .checkbox { display: flex; align-items: center; gap: 8px; }
.post-form .hint { margin-bottom: 16px; color: var(--secondary); font-size: 14px; }
.post-form .checkbox input { accent-color: var(--primary); }

.editor-toolbar {
    position: sticky;
    top: 8px;
    z-index: 20;
    margin: 0 0 var(--gap);
    padding: 10px;
    background: color-mix(in srgb, var(--theme) 92%, transparent);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(8px);
}

.editor-toolbar .delete-action { margin-left: auto; }

.draft-status {
    margin-left: auto;
    color: var(--secondary);
    font-size: 12px;
}

.editor-toolbar .delete-action + .draft-status { margin-left: 0; }

.draft-notice {
    display: flex;
    margin-bottom: var(--gap);
    padding: 10px 12px;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    color: var(--primary);
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 13px;
}

.draft-notice[hidden] { display: none; }
.draft-notice span { margin-right: auto; }

.editor-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 16px;
}

.editor-pane, .preview-pane { min-width: 0; }

.preview-label {
    display: block;
    margin-bottom: 6px;
    color: var(--secondary);
    font-size: 14px;
}

.preview-pane iframe {
    display: block;
    width: 100%;
    min-height: 520px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

@media (max-width: 768px) {
    :root { --gap: 14px; }
    body { font-size: 16px; }
    .logo a { font-size: 20px; }
    #menu a { font-size: 14px; }
    #menu li + li { margin-left: var(--gap); }
    .first-entry { min-height: 0; margin: var(--gap) 0; padding: 40px 0; }
    .page-header h1, .post-title { font-size: 32px; }
    .entry-header h2 { font-size: 21px; }
    .post-content h1 { font-size: 32px; }
    .post-content h2 { font-size: 27px; }
    .post-content h3 { font-size: 22px; }
    .paginav { flex-direction: column; gap: 8px; }
    .paginav a { width: 100%; }
    .post-form .two-col { grid-template-columns: 1fr; }
    .top-link { right: 16px; bottom: 20px; }
    .archive-group { grid-template-columns: 1fr; gap: 8px; }
    .archive-group li { grid-template-columns: 90px 1fr; gap: 10px; }

    .admin-table-wrap { overflow: visible; border: 0; }
    .admin-table { min-width: 0; background: transparent; }
    .admin-table thead { display: none; }
    .admin-table, .admin-table tbody, .admin-table tr, .admin-table td { display: block; width: 100%; }
    .admin-table tr {
        margin-bottom: 12px;
        padding: 10px 12px;
        background: var(--entry);
        border: 1px solid var(--border);
        border-radius: var(--radius);
    }
    .admin-table td {
        display: grid;
        grid-template-columns: 64px minmax(0, 1fr);
        padding: 5px 0;
        border: 0;
        gap: 8px;
    }
    .admin-table td::before {
        color: var(--secondary);
        content: attr(data-label);
        font-size: 12px;
    }
    .admin-table .actions { white-space: normal; }
    .admin-table td.actions { display: flex; align-items: center; gap: 12px; }
    .admin-table td.actions::before { width: 52px; flex: 0 0 52px; }
    .admin-table .actions a { margin: 0; }
    .form-section { padding: 16px; }
    .editor-grid { grid-template-columns: 1fr; }
    .editor-toolbar { top: 4px; }
    .editor-toolbar .delete-action { margin-left: 0; }
    .draft-status { width: 100%; margin-left: 0; }
}

@media (max-width: 480px) {
    #menu li + li { margin-left: 12px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .post-entry, .terms-tags a { transition: none; }
    .post-entry:active, .terms-tags a:active { transform: none; }
}