/* Notebook — Jupyter 셀 구조(In/Out)를 따르는 레이아웃 */

:root {
  --bg: #f4f5f7;
  --cell: #ffffff;
  --line: #d9dce1;
  --in: #307fc1;
  --out: #bf5b3d;
  --code: #f6f8fa;
  --ink: #1f2328;
  --dim: #6b7280;
  --chip: #ddf4ff;
  --chip-ink: #0969da;
  --g0: #ebedf0;
  --g1: #b7dcf5;
  --g2: #6fb3e8;
  --g3: #307fc1;
  --g4: #1b4f82;
  --font-serif: "Source Serif 4", "Noto Serif KR", Georgia, "Times New Roman", serif;
  --font-sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  --font-mono: "Source Code Pro", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* default.css 의 markdown 변수를 노트북 팔레트로 덮어쓴다 */
  --color-primary: var(--ink);
  --color-text-secondary: var(--dim);
  --color-background: var(--cell);
  --color-bg-secondary: var(--code);
  --color-border: var(--line);
  --color-link: var(--in);
  --color-accent: var(--in);
  --color-code-bg: #eff1f3;
  --color-blockquote-border: var(--in);
  --color-gray-200: #e3e6ea;
  --border-radius: 4px;
}

html {
  color-scheme: light;
}

html,
body {
  height: auto;
  min-height: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: #cfe6f8;
}

a {
  color: inherit;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 10;
  padding: 0.4rem 0.7rem;
  background: var(--ink);
  color: #fff;
  font-size: 0.8rem;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

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

/* Top bar --------------------------------------------------------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0.65rem 1.5rem;
  background: #fff;
  border-bottom: 1px solid var(--line);
  font-size: 0.875rem;
}

.brand {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.kernel {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--dim);
  white-space: nowrap;
}

.site-nav {
  margin-left: auto;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--in);
}

.site-nav a.is-active {
  font-weight: 600;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--in);
  outline-offset: 2px;
}

/* Notebook & cells ------------------------------------------------------ */

.nb {
  flex: 1;
  width: 100%;
  max-width: 960px;
  margin: 2rem auto 3rem;
  padding: 0 1rem;
  box-sizing: border-box;
}

.nb-wide {
  max-width: 1120px;
}

.row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 10px;
  margin-bottom: 1rem;
}

.lab {
  padding-top: 14px;
  font: 12px/1.2 var(--font-mono);
  text-align: right;
}

.in .lab {
  color: var(--in);
}

.out .lab {
  color: var(--out);
}

.cell {
  min-width: 0;
  padding: 14px 18px;
  background: var(--cell);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.row:hover > .cell {
  border-color: var(--in);
  box-shadow: -3px 0 0 var(--in);
}

.cell.code {
  background: var(--code);
  font: 14px/1.6 var(--font-mono);
}

.kw { color: #cf222e; }
.st { color: #0a3069; }
.fn { color: #8250df; }
.cm { color: #6e7781; }
.nu { color: #0550ae; }

.cell.md h1 {
  margin: 0 0 6px;
  font: 600 2.125rem/1.2 var(--font-serif);
  letter-spacing: -0.01em;
}

.cell.md p {
  margin: 4px 0;
  color: var(--dim);
}

.meta {
  font: 12px var(--font-mono);
  color: var(--dim);
}

.empty-note {
  margin: 0;
  color: var(--dim);
}

/* Summary --------------------------------------------------------------- */

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.stat {
  padding: 10px 14px;
  background: var(--code);
  border-radius: 4px;
}

.stat b {
  display: block;
  font: 600 1.5rem var(--font-mono);
  color: var(--in);
}

.stat span {
  font-size: 0.8rem;
  color: var(--dim);
}

/* Activity heatmap ------------------------------------------------------ */

.activity-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.years {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.years button {
  padding: 2px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  color: var(--dim);
  font: 12px var(--font-mono);
  cursor: pointer;
}

.years button:hover {
  border-color: var(--in);
  color: var(--in);
}

.years button[aria-pressed="true"] {
  border-color: var(--in);
  background: var(--in);
  color: #fff;
}

.hm {
  overflow-x: auto;
  padding-bottom: 4px;
}

.hm-inner {
  display: inline-block;
  min-width: 100%;
}

.hm-body {
  display: flex;
  gap: 6px;
}

.hm-days {
  display: grid;
  grid-template-rows: repeat(7, 11px);
  gap: 3px;
  width: 26px;
  margin-top: 18px;
  font: 10px/11px var(--font-mono);
  color: var(--dim);
}

.hm-days span:nth-child(odd) {
  visibility: hidden;
}

.hm-main {
  position: relative;
}

.hm-months {
  position: relative;
  height: 18px;
  font: 11px var(--font-mono);
  color: var(--dim);
}

.hm-months span {
  position: absolute;
  top: 0;
  white-space: nowrap;
}

.hm-grid {
  display: grid;
  grid-template-rows: repeat(7, 11px);
  grid-auto-flow: column;
  grid-auto-columns: 11px;
  gap: 3px;
}

.hm-grid i,
.hm-grid a {
  display: block;
  border-radius: 2px;
  background: var(--g0);
}

.hm-grid .future {
  opacity: 0.45;
}

.hm-grid .l1 { background: var(--g1); }
.hm-grid .l2 { background: var(--g2); }
.hm-grid .l3 { background: var(--g3); }
.hm-grid .l4 { background: var(--g4); }

.hm-grid i:hover,
.hm-grid a:hover {
  outline: 2px solid var(--ink);
  outline-offset: 0;
}

.hm-legend {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.7rem;
  font: 11px var(--font-mono);
  color: var(--dim);
}

.hm-scale {
  display: flex;
  align-items: center;
  gap: 3px;
}

.hm-scale i {
  display: inline-block;
  width: 11px;
  height: 11px;
  border-radius: 2px;
}

.hm-tip {
  position: fixed;
  z-index: 20;
  display: none;
  padding: 6px 10px;
  background: #1f2328;
  border-radius: 6px;
  color: #fff;
  font: 12px var(--font-sans);
  pointer-events: none;
  white-space: nowrap;
}

/* Post list ------------------------------------------------------------- */

.post {
  padding: 14px 0;
  border-bottom: 1px solid #eceef1;
}

.post:first-child {
  padding-top: 2px;
}

.post:last-child {
  border-bottom: 0;
  padding-bottom: 2px;
}

.post h3 {
  margin: 0;
  font: 600 1.2rem/1.35 var(--font-serif);
}

.post h3 a {
  color: var(--in);
  text-decoration: none;
}

.post h3 a:hover {
  text-decoration: underline;
}

.post p {
  margin: 3px 0 6px;
  color: var(--dim);
  font-size: 0.9rem;
}

.post .meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
}

.tag {
  padding: 1px 8px;
  border-radius: 10px;
  background: var(--chip);
  color: var(--chip-ink);
  font: 12px var(--font-mono);
  text-decoration: none;
}

.tag:hover {
  background: #c5e8fb;
}

.more {
  display: inline-block;
  margin-top: 0.5rem;
  color: var(--in);
  font: 13px var(--font-mono);
  text-decoration: none;
}

.more:hover {
  text-decoration: underline;
}

/* Tags ------------------------------------------------------------------ */

.tag-index {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tag-index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 3px 12px;
  border-radius: 14px;
  background: var(--chip);
  color: var(--chip-ink);
  font-size: 0.9rem;
  text-decoration: none;
}

.tag-index a:hover {
  background: #c5e8fb;
}

.tag-count {
  padding: 0 7px;
  border-radius: 10px;
  background: #fff;
  font: 600 12px var(--font-mono);
}

/* Search ---------------------------------------------------------------- */

.search input {
  width: 100%;
  box-sizing: border-box;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
  color: var(--ink);
  font: 14px var(--font-mono);
}

.search input:focus {
  outline: 2px solid var(--in);
  border-color: transparent;
}

.search input::placeholder {
  color: #9aa1ab;
}

.search #results-container {
  margin: 0;
  padding: 0;
  list-style: none;
}

.search #results-container li {
  padding: 0.75rem 0;
  border-bottom: 1px solid #eceef1;
}

.search #results-container li:last-child {
  border-bottom: 0;
}

.search #results-container a {
  color: var(--in);
  font: 600 1.05rem var(--font-serif);
  text-decoration: none;
}

.search #results-container a:hover {
  text-decoration: underline;
}

.search .search-result-content {
  margin: 0.2rem 0 0;
  color: var(--dim);
  font-size: 0.875rem;
}

/* Pagination ------------------------------------------------------------ */

.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font: 13px var(--font-mono);
}

.pagination a,
.pagination span {
  color: var(--in);
  text-decoration: none;
}

.pagination a:hover {
  text-decoration: underline;
}

.pagination .is-disabled {
  color: #b4bac3;
}

.pagination .page-number {
  color: var(--dim);
}

/* Footer ---------------------------------------------------------------- */

.colophon {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.5rem 1rem 2rem;
  font: 12px var(--font-mono);
  color: var(--dim);
}

.colophon p {
  margin: 0;
}

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

.colophon a:hover {
  color: var(--in);
}

/* Article --------------------------------------------------------------- */

.markdown-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 15rem;
  gap: 1.5rem;
  align-items: start;
  width: 100%;
  background: transparent;
  color: var(--ink);
  font-family: var(--font-sans);
}

/* default.css 의 GitHub clearfix 가상 요소가 grid 아이템이 되어 본문을 밀어내는 것을 방지 */
.markdown-body::before,
.markdown-body::after {
  display: none;
}

.md-content {
  width: auto;
  min-height: 0;
  min-width: 0;
  padding: 1.75rem 2rem 1.25rem;
  background: var(--cell);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.md-index {
  position: sticky;
  top: 4.25rem;
  width: auto;
  max-height: calc(100vh - 5.5rem);
  padding: 14px 18px;
  overflow-y: auto;
  background: var(--cell);
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 0.85rem;
}

.markdown-body .md-index h2 {
  margin: 1.25rem 0 0.5rem;
  padding: 0;
  border: none;
  color: var(--dim);
  font: 600 12px var(--font-mono);
  letter-spacing: 0.04em;
}

.markdown-body .md-index h2:first-child {
  margin-top: 0;
}

.md-index ul,
.md-index ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.md-index li {
  margin: 0.4rem 0;
}

.md-index a {
  color: var(--ink);
  text-decoration: none;
}

.md-index a:hover {
  color: var(--in);
}

.md-index .toc-h3 {
  padding-left: 0.85rem;
}

.md-index p {
  margin: 0 0 0.5rem;
  padding: 0;
  border: none;
  font-size: 0.875rem;
  line-height: 1.45;
}

.side-empty {
  color: var(--dim);
}

.article-head {
  margin: 0 0 1.5rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--line);
}

.article-kicker {
  margin: 0 0 0.6rem;
  font: 12px var(--font-mono);
  color: var(--dim);
}

.article-kicker time {
  margin-right: 0.6rem;
}

.markdown-body .article-title {
  margin: 0;
  padding: 0;
  border: none;
  font: 600 2.25rem/1.25 var(--font-serif);
  letter-spacing: -0.01em;
  word-break: keep-all;
  text-wrap: balance;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.9rem 0 0;
}

.back-top {
  margin: 2rem 0 0;
  font: 12px var(--font-mono);
}

.back-top a {
  color: var(--in);
  text-decoration: none;
}

.back-top a:hover {
  text-decoration: underline;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.markdown-body h2 {
  font-size: 1.55rem;
}

.markdown-body a {
  color: var(--in);
  text-decoration: none;
}

.markdown-body a:hover {
  text-decoration: underline;
}

.markdown-body .tag {
  background: var(--chip);
  color: var(--chip-ink);
}

.markdown-body .tag:hover {
  background: #c5e8fb;
  text-decoration: none;
}

.markdown-body blockquote {
  border-left-width: 3px;
  background: var(--code);
}

.markdown-body pre {
  border: 1px solid #e3e6ea;
}

/* Responsive ------------------------------------------------------------ */

@media (max-width: 800px) {
  .topbar {
    flex-wrap: wrap;
    padding: 0.6rem 1rem;
  }

  .kernel {
    display: none;
  }

  .site-nav {
    width: 100%;
    margin-left: 0;
  }

  .nb {
    margin-top: 1.25rem;
  }

  .markdown-body {
    grid-template-columns: minmax(0, 1fr);
    gap: 1rem;
  }

  .md-content {
    padding: 1.25rem 1.1rem 1rem;
  }

  .md-index {
    position: static;
    max-height: none;
  }

  .markdown-body .article-title {
    font-size: 1.75rem;
  }
}

@media (max-width: 700px) {
  .row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .lab {
    padding: 0;
    text-align: left;
  }

  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cell.md h1 {
    font-size: 1.75rem;
  }
}