/* 한국어 장문 읽기를 위한 타이포그래피 중심 스타일.
   색은 custom properties 두 벌로 정의하고 다크 모드는 prefers-color-scheme만 따른다 (PLAN §9-9). */

:root {
  --bg: #ffffff;
  --fg: #24292f;
  --muted: #6e7781;
  --link: #0b5cad;
  --border: #d8dce1;
  --code-bg: #f4f5f7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1b1e;
    --fg: #e8e9eb;
    --muted: #9ba1a8;
    --link: #8ab4f8;
    --border: #33363b;
    --code-bg: #26282d;
  }
}

* {
  box-sizing: border-box;
}

html {
  /* 본문 세리프 — Literata(라틴) + Noto Serif KR(한글), self-host(/fonts.css).
     웹폰트가 로드되기 전/실패 시 시스템 세리프로 폴백한다(font-display: swap). */
  font-family:
    "Literata", "Noto Serif KR", Georgia, "Nanum Myeongjo", "Apple SD Gothic Neo", serif;
}

body {
  margin: 0 auto;
  max-width: 40rem;
  padding: 0 1.25rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font-size: 1.0625rem;
  line-height: 1.75;
  letter-spacing: -0.01em;
  word-break: keep-all;
}

::selection {
  background: color-mix(in srgb, var(--link) 22%, transparent);
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---- 사이트 골격 ---- */

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.site-title {
  font-weight: 700;
  text-decoration: none;
  color: var(--fg);
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-header nav a:hover {
  color: var(--link);
  text-decoration: underline;
}

.site-footer {
  margin-top: 4rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.875rem;
}

/* ---- 홈: 최신 글 목록 ---- */

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-list li {
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--border);
}

.post-list a {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  text-decoration: none;
  color: var(--fg);
}

.post-list a:hover {
  color: var(--link);
  text-decoration: underline;
}

.post-list time,
.post-meta {
  display: block;
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.875rem;
  letter-spacing: 0;
}

.post-list p {
  margin: 0.5rem 0 0;
  color: var(--muted);
  line-height: 1.65;
}

/* ---- 본문 타이포그래피 ---- */

.post-body {
  overflow-wrap: break-word;
}

.post-body p {
  margin: 1.4em 0;
}

.post-body h1,
.post-body h2,
.post-body h3,
.post-body h4 {
  line-height: 1.4;
  letter-spacing: -0.02em;
}

.post-body h1 {
  font-size: 1.7rem;
  margin: 2.2em 0 0.7em;
}

.post-body h2 {
  font-size: 1.375rem;
  margin: 2.4em 0 0.8em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
}

.post-body h3 {
  font-size: 1.18rem;
  margin: 1.9em 0 0.6em;
}

.post-body h4 {
  font-size: 1.05rem;
  margin: 1.7em 0 0.5em;
}

/* 제목 바로 뒤 제목은 위 간격을 줄인다 */
.post-body h1 + h2,
.post-body h2 + h3,
.post-body h3 + h4 {
  margin-top: 1.2em;
}

.post-body ul,
.post-body ol {
  margin: 1.4em 0;
  padding-left: 1.4em;
}

.post-body li {
  margin: 0.35em 0;
}

.post-body li > ul,
.post-body li > ol {
  margin: 0.35em 0;
}

.post-body blockquote {
  margin: 1.8em 0;
  padding: 0.2em 0 0.2em 1.1em;
  border-left: 3px solid var(--border);
  color: var(--muted);
}

.post-body hr {
  margin: 2.8em 0;
  border: none;
  border-top: 1px solid var(--border);
}

.post-body img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

/* 표: 좁은 화면에서는 가로 스크롤 */
.post-body table {
  display: block;
  width: max-content;
  max-width: 100%;
  overflow-x: auto;
  margin: 1.8em 0;
  border-collapse: collapse;
  font-size: 0.95em;
  line-height: 1.6;
}

.post-body th,
.post-body td {
  padding: 0.5em 1em;
  border: 1px solid var(--border);
  text-align: left;
}

.post-body th {
  background: var(--code-bg);
  font-weight: 600;
}

/* 코드 */
.post-body code {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
  letter-spacing: 0;
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.post-body pre {
  margin: 1.8em 0;
  padding: 1rem 1.2rem;
  background: var(--code-bg);
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.65;
}

.post-body pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

/* 각주 (markdown-it-footnote) */
.post-body sup a {
  text-decoration: none;
  padding: 0 0.1em;
}

.post-body .footnotes {
  margin-top: 3em;
  font-size: 0.875em;
  line-height: 1.7;
  color: var(--muted);
}

.post-body .footnotes-sep {
  margin: 0 0 1em;
}

.post-body .footnote-backref {
  text-decoration: none;
}

article footer {
  margin-top: 3rem;
  font-size: 0.9rem;
}

/* ---- 아카이브: 연 → 월 → 일 트리 (데스크톱·모바일 공용) ---- */

.archive details {
  margin-left: 1rem;
}

.archive > details {
  margin-left: 0;
}

.archive summary {
  cursor: pointer;
  padding: 0.3rem 0.4rem;
  margin-left: -0.4rem;
  border-radius: 4px;
}

.archive summary:hover {
  background: var(--code-bg);
}

.archive summary a {
  color: var(--fg);
  font-weight: 600;
  text-decoration: none;
}

.archive summary a:hover {
  color: var(--link);
  text-decoration: underline;
}

.archive .count {
  color: var(--muted);
  font-size: 0.85em;
}

.archive ul {
  list-style: none;
  margin: 0.2rem 0 0.6rem;
  padding-left: 1.6rem;
}

.archive li {
  padding: 0.15rem 0;
}

.breadcrumb {
  margin-bottom: 0.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ---- 콜아웃: > [!note] 블록 ---- */

.callout {
  --callout-color: #539bf5;
  margin: 1.8em 0;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--callout-color);
  border-radius: 6px;
  background: color-mix(in srgb, var(--callout-color) 8%, transparent);
  line-height: 1.7;
}

.callout-title {
  margin: 0 0 0.3rem;
  font-weight: 700;
  color: var(--callout-color);
}

.callout-content > :first-child {
  margin-top: 0;
}

.callout-content > :last-child {
  margin-bottom: 0;
}

.callout[data-callout="note"],
.callout[data-callout="info"] {
  --callout-color: #3b82f6;
}

.callout[data-callout="abstract"],
.callout[data-callout="question"] {
  --callout-color: #8b5cf6;
}

.callout[data-callout="tip"],
.callout[data-callout="success"] {
  --callout-color: #22a35b;
}

.callout[data-callout="warning"],
.callout[data-callout="todo"] {
  --callout-color: #c08a00;
}

.callout[data-callout="failure"],
.callout[data-callout="danger"],
.callout[data-callout="bug"] {
  --callout-color: #dc4444;
}

.callout[data-callout="example"],
.callout[data-callout="quote"] {
  --callout-color: #6a737d;
}

/* ---- 모바일 ---- */

@media (max-width: 640px) {
  body {
    padding: 0 1rem 3rem;
  }

  .site-header {
    margin-bottom: 1.8rem;
  }

  /* 터치 대상을 넉넉히 */
  .post-list li {
    padding: 1.15rem 0;
  }

  .archive details {
    margin-left: 0.55rem;
  }

  .archive summary {
    padding: 0.45rem 0.4rem;
  }

  .archive ul {
    padding-left: 1.1rem;
  }

  .post-body h1 {
    font-size: 1.5rem;
  }

  .post-body h2 {
    font-size: 1.25rem;
  }
}