:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --surface: #f9f9f9;
  --text: #242424;
  --muted: #6b6b6b;
  --line: #ebebeb;
  --accent: #1a8917;
  --accent-strong: #0f730c;
  --accent-soft: #f2f2f2;
  --code-bg: #f9f9f9;
  --code-text: #242424;
  --syntax-keyword: #b5185e;
  --syntax-string: #0b7a3e;
  --syntax-comment: #8a8a8a;
  --syntax-number: #6f42c1;
  --max-width: 68rem;
  --reading-width: 42.5rem;
  --font-sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Apple SD Gothic Neo", Pretendard, "Segoe UI", sans-serif;
  --font-serif: Charter, "Iowan Old Style", "Noto Serif KR", Georgia, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-family: var(--font-sans);
  font-synthesis: none;
}

:root[data-theme="dark"] {
  --bg: #121212;
  --surface: #1b1b1b;
  --text: #e6e6e6;
  --muted: #a3a3a3;
  --line: #2b2b2b;
  --accent: #4cc35a;
  --accent-strong: #79d983;
  --accent-soft: #242424;
  --code-bg: #1b1b1b;
  --code-text: #e6e6e6;
  --syntax-keyword: #ff8db3;
  --syntax-string: #a8df95;
  --syntax-comment: #8f8f8f;
  --syntax-number: #c3a6ff;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121212;
    --surface: #1b1b1b;
    --text: #e6e6e6;
    --muted: #a3a3a3;
    --line: #2b2b2b;
    --accent: #4cc35a;
    --accent-strong: #79d983;
    --accent-soft: #242424;
    --code-bg: #1b1b1b;
    --code-text: #e6e6e6;
    --syntax-keyword: #ff8db3;
    --syntax-string: #a8df95;
    --syntax-comment: #8f8f8f;
    --syntax-number: #c3a6ff;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font-size: 1rem; line-height: 1.6; word-break: keep-all; overflow-wrap: break-word; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration-thickness: .06em; text-underline-offset: .2em; }
a:hover { color: var(--text); }
img { display: block; max-width: 100%; height: auto; }
button, input { font: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.container { width: min(calc(100% - 3rem), var(--max-width)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 100; top: .75rem; left: .75rem; padding: .65rem 1rem; background: var(--text); color: var(--bg); transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }

/* Header */
.site-header { position: sticky; z-index: 20; top: 0; border-bottom: 1px solid var(--line); background: var(--bg); }
.header-inner { min-height: 3.6rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { color: var(--text); font-family: var(--font-serif); font-size: 1.6rem; font-weight: 700; letter-spacing: -.03em; text-decoration: none; }
.site-header nav { display: flex; align-items: center; gap: 1.5rem; }
.site-header nav a { color: var(--muted); font-size: .92rem; text-decoration: none; }
.site-header nav a[aria-current="page"], .site-header nav a:hover { color: var(--text); }
.theme-toggle { width: 2.1rem; height: 2.1rem; border: 0; border-radius: 999px; color: var(--muted); background: transparent; cursor: pointer; font-size: 1.05rem; }
.theme-toggle:hover { color: var(--text); background: var(--accent-soft); }
.site-main { min-height: calc(100vh - 10rem); }

/* Home hero */
.hero { padding-block: clamp(4rem, 10vw, 7.5rem); border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0 0 1rem; color: var(--muted); font-size: .78rem; font-weight: 600; letter-spacing: .12em; }
.eyebrow a { color: inherit; text-decoration: none; }
.eyebrow a:hover { color: var(--text); }
.hero h1 { max-width: 13ch; margin: 0; font-family: var(--font-serif); font-size: clamp(2.8rem, 7.5vw, 6rem); font-weight: 400; line-height: 1.08; letter-spacing: -.045em; word-break: keep-all; }
.hero__description { max-width: 34rem; margin: 2rem 0 2.5rem; color: var(--muted); font-size: clamp(1.1rem, 2vw, 1.35rem); line-height: 1.5; }
.button-link { display: inline-flex; padding: .6rem 1.4rem; border-radius: 999px; background: var(--text); color: var(--bg); font-size: 1rem; text-decoration: none; }
.button-link:hover { background: var(--accent); color: #fff; }

/* Sections and lists */
.section { padding-block: 3rem 5rem; }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; margin-bottom: .5rem; padding-bottom: .9rem; border-bottom: 1px solid var(--line); }
.section-heading h2, .tag-section > h2 { margin: 0; font-size: 1rem; font-weight: 600; letter-spacing: 0; }
.section-heading a { color: var(--accent); font-size: .9rem; text-decoration: none; }
.tag-section h2 { margin-bottom: 1.25rem; }
.post-grid, .post-list, .part-list { display: grid; max-width: var(--reading-width); margin: 0; padding: 0; list-style: none; }
.post-card { display: flex; align-items: center; gap: 2rem; padding-block: 2rem; border-bottom: 1px solid var(--line); }
.post-card__body { flex: 1; min-width: 0; }
.post-card__title { margin: 0 0 .4rem; font-size: clamp(1.25rem, 2.5vw, 1.5rem); font-weight: 700; line-height: 1.3; letter-spacing: -.02em; }
.post-card__title a { color: var(--text); text-decoration: none; }
.post-card__title a:hover { text-decoration: underline; }
.post-card__summary { display: -webkit-box; overflow: hidden; margin: 0 0 1rem; color: var(--muted); font-size: 1rem; line-height: 1.5; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.post-card__meta, .post-meta { color: var(--muted); font-size: .85rem; }
.post-card__meta { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; }
.post-card__meta .tag { margin-left: .25rem; }
.post-card__thumb { flex: none; width: 8.5rem; aspect-ratio: 4 / 3; object-fit: cover; }
.series-card .post-card__summary { margin-bottom: 0; }
.series-card .post-card__meta { margin-bottom: .5rem; }

.tag-cloud { display: flex; flex-wrap: wrap; gap: .5rem; }
.tag { display: inline-flex; padding: .3rem .8rem; border-radius: 999px; color: var(--text); background: var(--accent-soft); font-size: .85rem; text-decoration: none; }
.tag:hover { color: var(--text); background: var(--line); }
.tag--count { padding: .5rem 1rem; }
.empty-state { max-width: var(--reading-width); padding: 3rem 0; color: var(--muted); }

/* Pages */
.page { padding-block: clamp(3rem, 7vw, 5.5rem); }
.page-header { max-width: var(--reading-width); margin-bottom: 1.5rem; }
.page-header h1, .post-header h1, .not-found h1 { margin: 0; font-size: clamp(2.2rem, 5vw, 2.75rem); font-weight: 700; line-height: 1.18; letter-spacing: -.025em; }
.page-header p:last-child { margin-bottom: 0; color: var(--muted); font-size: 1.1rem; }
.series-intro { max-width: var(--reading-width); margin-bottom: 1.5rem; }

/* Article */
.post { max-width: calc(var(--reading-width) + 3rem); padding-block: clamp(2.5rem, 6vw, 4.5rem) 5rem; }
.post-header { margin-bottom: 2.5rem; }
.post-header h1 { margin-block: 0 .75rem; }
.post-lede, .lead { margin: 0 0 2rem; color: var(--muted); font-size: 1.35rem; line-height: 1.4; }
.byline { display: flex; align-items: center; gap: .75rem; padding-block: 1rem; border-block: 1px solid var(--line); }
.byline__avatar { display: grid; place-items: center; width: 2.75rem; height: 2.75rem; border-radius: 999px; background: var(--text); color: var(--bg); font-family: var(--font-serif); font-size: 1.2rem; font-weight: 700; }
.byline__text { display: grid; gap: .1rem; }
.byline__name { font-size: .95rem; font-weight: 500; }
.post-cover { width: 100%; margin-top: 2.5rem; aspect-ratio: 16 / 9; object-fit: cover; }

.prose { font-family: var(--font-serif); font-size: 1.25rem; line-height: 1.6; letter-spacing: -.003em; word-break: keep-all; overflow-wrap: break-word; }
.prose > *:first-child { margin-top: 0; }
.prose p, .prose ul, .prose ol { margin-block: 2rem 0; }
.prose li { margin-top: .9rem; padding-left: .25rem; }
.prose li > p, .prose li > ul, .prose li > ol { margin-top: 0; }
.prose a { text-decoration: underline; }
.prose h2, .prose h3 { scroll-margin-top: 5rem; font-family: var(--font-sans); font-weight: 700; line-height: 1.25; letter-spacing: -.02em; }
.prose h2 { margin: 3.5rem 0 0; font-size: 1.6rem; }
.prose h3 { margin: 2.5rem 0 0; font-size: 1.3rem; }
.prose h2 + p, .prose h3 + p { margin-top: .75rem; }
.prose blockquote { margin: 2rem 0 0; padding-left: 1.4rem; border-left: 3px solid var(--text); font-style: italic; }
.prose blockquote p { margin-top: 0; }
.prose hr { margin: 3rem auto; border: 0; text-align: center; }
.prose hr::before { content: "···"; color: var(--muted); font-size: 1.6rem; letter-spacing: 1em; }
.prose img { margin: 2.5rem auto 0; }
.prose :not(pre) > code { padding: .12rem .35rem; border-radius: .25rem; background: var(--accent-soft); font-family: var(--font-mono); font-size: .8em; }
.prose pre { overflow-x: auto; margin: 2rem 0 0; padding: 1.5rem; border-radius: .25rem; background: var(--code-bg); color: var(--code-text); font-size: .85rem; line-height: 1.7; tab-size: 2; }
.prose pre code { font-family: var(--font-mono); }
.syntax-keyword { color: var(--syntax-keyword); }
.syntax-string { color: var(--syntax-string); }
.syntax-comment { color: var(--syntax-comment); font-style: italic; }
.syntax-number { color: var(--syntax-number); }
.table-scroll { overflow-x: auto; margin: 2rem 0 0; }
.prose table { width: 100%; border-collapse: collapse; font-family: var(--font-sans); font-size: .95rem; }
.prose th, .prose td { padding: .7rem .85rem; border-bottom: 1px solid var(--line); text-align: left; }
.prose th { font-weight: 600; }
.post-tags { margin-top: 3rem; }

/* Series */
.series-trail { display: block; margin-bottom: 1.25rem; color: var(--muted); font-size: .9rem; }
.series-trail a { color: var(--accent); text-decoration: none; }
.series-trail a:hover { text-decoration: underline; }
.part-nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 3.5rem; }
.part-nav__link { display: grid; gap: .25rem; padding: 1.1rem 1.25rem; border: 1px solid var(--line); border-radius: .25rem; color: var(--text); text-decoration: none; }
.part-nav__link:hover { border-color: var(--muted); }
.part-nav__link small { color: var(--muted); font-size: .8rem; }
.part-nav__link span { font-weight: 600; line-height: 1.35; }
.part-nav__link--next { grid-column: 2; text-align: right; }

/* Footer, comments, misc */
.post-footer { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--line); font-size: .9rem; }
.post-footer a { color: var(--muted); }
.comments { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.comments h2 { font-size: 1.25rem; }
.comments--setup { padding: 1.5rem; border: 1px solid var(--line); border-radius: .25rem; color: var(--muted); }
.comments--setup h2 { margin-top: 0; color: var(--text); }
.comments--setup a { color: var(--accent); }
.about { max-width: calc(var(--reading-width) + 3rem); }
.about h1 { margin: 0 0 1rem; font-family: var(--font-sans); font-size: clamp(2.2rem, 5vw, 2.75rem); line-height: 1.18; letter-spacing: -.025em; }
.not-found { padding-block: 8rem; text-align: center; }
.not-found p:not(.eyebrow) { margin-bottom: 2rem; color: var(--muted); }

.site-footer { border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; }
.footer-inner { min-height: 6rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.footer-links { display: flex; gap: 1.25rem; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--text); }

@media (max-width: 44rem) {
  .container { width: min(calc(100% - 2rem), var(--max-width)); }
  .brand { font-size: 1.35rem; }
  .site-header nav { gap: 1rem; }
  .hero { padding-block: 3.5rem; }
  .post-card { gap: 1rem; padding-block: 1.5rem; }
  .post-card__thumb { width: 5rem; aspect-ratio: 1; }
  .prose { font-size: 1.125rem; }
  .prose p, .prose ul, .prose ol { margin-top: 1.6rem; }
  .post-lede, .lead { font-size: 1.15rem; }
  .part-nav { grid-template-columns: 1fr; }
  .part-nav__link--next { grid-column: auto; }
  .part-nav__empty { display: none; }
  .footer-inner { align-items: flex-start; flex-direction: column; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}