:root {
  --surface-page: #cdccc5;
  --surface-panel: #d7d6cf;
  --surface-muted: #c1c0b8;
  --text-primary: #1a1a18;
  --text-secondary: #47463f;
  --text-tertiary: #55544c;
  --border-subtle: #b2b1a8;
  --border-strong: #98978e;
  --accent-primary: #1a1a18;
  --accent-hover: #000000;
  --accent-warm: #5d5c54;
  --accent-warm-hover: #3e3d36;

  --font-mono: "JetBrains Mono", "SF Mono", Monaco, Consolas, "Liberation Mono", monospace;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  --content: 880px;
  --reading: 700px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --surface-page: #161615;
  --surface-panel: #201f1e;
  --surface-muted: #292827;
  --text-primary: #ecebe6;
  --text-secondary: #b4b3ac;
  --text-tertiary: #8f8e86;
  --border-subtle: #33322f;
  --border-strong: #55544e;
  --accent-primary: #e6e5df;
  --accent-hover: #ffffff;
  --accent-warm: #9a998f;
  --accent-warm-hover: #c2c1b6;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --surface-page: #161615;
    --surface-panel: #201f1e;
    --surface-muted: #292827;
    --text-primary: #ecebe6;
    --text-secondary: #b4b3ac;
    --text-tertiary: #8f8e86;
    --border-subtle: #33322f;
    --border-strong: #55544e;
    --accent-primary: #e6e5df;
    --accent-hover: #ffffff;
    --accent-warm: #9a998f;
    --accent-warm-hover: #c2c1b6;
  }
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/assets/jetbrains-mono-400.woff2") format("woff2");
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("/assets/jetbrains-mono-600.woff2") format("woff2");
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR",
    "Segoe UI", system-ui, sans-serif;
  line-height: 1.5;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--surface-page);
  color: var(--text-primary);
  font-size: 16px;
}

body,
h1,
h2,
h3,
p,
ol,
ul,
pre {
  margin: 0;
}

a {
  color: inherit;
  text-decoration-color: var(--border-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color 140ms ease-out, text-decoration-color 140ms ease-out;
}

a:hover {
  color: var(--accent-primary);
  text-decoration-color: var(--accent-primary);
}

a:focus-visible {
  border-radius: 4px;
  outline: 3px solid color-mix(in srgb, var(--accent-primary) 35%, transparent);
  outline-offset: 4px;
}

img {
  display: block;
  max-width: 100%;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: var(--space-4);
  z-index: 10;
  transform: translateY(-160%);
  border: 1px solid var(--border-strong);
  background: var(--surface-panel);
  color: var(--text-primary);
  padding: var(--space-3) var(--space-4);
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  width: min(100% - var(--space-8), var(--content));
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid var(--border-subtle);
  background: color-mix(in srgb, var(--surface-page) 92%, white);
}

:root[data-theme="dark"] .site-header {
  background: color-mix(in srgb, var(--surface-page) 92%, black);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .site-header {
    background: color-mix(in srgb, var(--surface-page) 92%, black);
  }
}

.masthead {
  display: flex;
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  padding-block: var(--space-3);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 650;
  text-decoration: none;
}

.nav-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-5);
}

.site-nav,
.footer-grid nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  background: var(--surface-panel);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.4;
  padding: var(--space-1) var(--space-3);
  cursor: pointer;
  transition: color 140ms ease-out, border-color 140ms ease-out;
}

.theme-toggle:hover {
  border-color: var(--border-strong);
  color: var(--accent-warm);
}

.theme-toggle:focus-visible {
  border-radius: 4px;
  outline: 3px solid color-mix(in srgb, var(--accent-primary) 35%, transparent);
  outline-offset: 2px;
}

.theme-toggle-icon {
  font-size: 0.85rem;
}

.memo-intro {
  max-width: var(--reading);
  padding-block: var(--space-16) var(--space-10);
}

.eyebrow,
.status-line,
.note-meta,
.note-tags,
.footer-grid p {
  font-family: var(--font-mono);
}

.eyebrow {
  color: var(--text-tertiary);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.45;
  text-transform: uppercase;
}

.memo-intro h1 {
  margin-top: var(--space-3);
  font-size: clamp(2.3rem, 6vw, 3.5rem);
  font-weight: 750;
  letter-spacing: 0;
  line-height: 1.08;
  text-wrap: balance;
  word-break: keep-all;
}

.lead {
  max-width: var(--reading);
  margin-top: var(--space-5);
  color: var(--text-secondary);
  font-size: 1.125rem;
  line-height: 1.75;
  overflow-wrap: break-word;
  text-wrap: pretty;
  word-break: keep-all;
}

.status-line {
  margin-top: var(--space-5);
  color: var(--text-tertiary);
  font-size: 0.75rem;
  line-height: 1.55;
}

.nowrap {
  white-space: nowrap;
}

.section-block {
  border-top: 1px solid var(--border-subtle);
  padding-block: var(--space-8);
}

.compact-section {
  max-width: var(--reading);
}

.section-heading {
  display: grid;
  gap: var(--space-1);
  margin-bottom: var(--space-5);
}

.section-heading h2 {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  line-height: 1.25;
  word-break: keep-all;
}

.note-list {
  border-bottom: 1px solid var(--border-subtle);
}

.note-row {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: var(--space-6);
  border-top: 1px solid var(--border-subtle);
  padding-block: var(--space-6);
}

.note-row-muted {
  color: var(--text-secondary);
}

.note-meta {
  display: grid;
  align-content: start;
  gap: var(--space-2);
  color: var(--text-tertiary);
  font-size: 0.75rem;
  line-height: 1.45;
  text-transform: lowercase;
}

.note-body {
  min-width: 0;
}

.note-body h3 {
  font-size: 1.25rem;
  font-weight: 650;
  line-height: 1.35;
  text-wrap: pretty;
  word-break: keep-all;
}

.note-body h3 a {
  text-decoration: none;
}

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

.note-body p,
.section-copy,
.term-description {
  margin-top: var(--space-3);
  color: var(--text-secondary);
  line-height: 1.75;
  overflow-wrap: break-word;
  text-wrap: pretty;
  word-break: keep-all;
}

.note-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.note-tags span,
.note-tags a {
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  background: var(--surface-muted);
  color: var(--text-secondary);
  font-size: 0.75rem;
  line-height: 1.4;
  padding: var(--space-1) var(--space-2);
  transition: border-color 140ms ease-out, background-color 140ms ease-out, color 140ms ease-out;
}

.note-tags a {
  text-decoration: none;
}

.note-tags a:hover {
  border-color: var(--accent-warm);
  background: color-mix(in srgb, var(--accent-warm) 12%, var(--surface-muted));
  color: var(--accent-warm-hover);
}

.section-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
}

.check-list {
  display: grid;
  gap: var(--space-3);
  padding-left: 1.35rem;
  color: var(--text-secondary);
  line-height: 1.7;
  word-break: keep-all;
}

.article-shell {
  padding-block: var(--space-12) var(--space-16);
}

.archive-shell {
  padding-block: var(--space-12) var(--space-16);
}

.archive-header {
  max-width: var(--reading);
  padding-bottom: var(--space-8);
}

.article {
  max-width: var(--reading);
}

.article-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: var(--space-8);
}

.article h1,
.archive-header h1 {
  margin-top: var(--space-3);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 750;
  line-height: 1.14;
  text-wrap: balance;
  word-break: keep-all;
}

.article section {
  border-top: 1px solid var(--border-subtle);
  margin-top: var(--space-8);
  padding-top: var(--space-8);
}

.article h2 {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  line-height: 1.25;
  text-wrap: balance;
  word-break: keep-all;
}

.article p {
  margin-top: var(--space-4);
  color: var(--text-primary);
  font-size: 1.03125rem;
  line-height: 1.8;
  overflow-wrap: break-word;
  text-wrap: pretty;
  word-break: keep-all;
}

.article code {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

/* 줄바꿈 지점이 없는 긴 식별자 하나가 본문 칼럼을 넘겨 페이지를 가로로 늘린다.
   pre 안의 코드는 pre가 스크롤하므로 제외한다. */
.article :not(pre) > code {
  overflow-wrap: break-word;
}

.article p code {
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  background: var(--surface-muted);
  padding: 0 var(--space-1);
}

.article pre {
  position: relative;
  margin-top: var(--space-5);
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  background: var(--surface-muted);
  padding: var(--space-8) var(--space-5) var(--space-5);
}

.article pre code {
  display: block;
  min-width: max-content;
  line-height: 1.7;
}

/* mermaid 도식 - 렌더링이 끝날 때까지 원본 텍스트를 감춘다.
   mermaid-init.js가 끝나면(실패해도) mermaid-pending이 벗겨진다. */
.mermaid-pending .article pre.mermaid {
  visibility: hidden;
}
.article pre.mermaid {
  padding: var(--space-5);
  text-align: center;
}
.article pre.mermaid svg {
  max-width: 100%;
  height: auto;
}

.code-copy {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  background: var(--surface-panel);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.4;
  padding: var(--space-1) var(--space-2);
  cursor: pointer;
  transition: border-color 140ms ease-out, color 140ms ease-out;
}

.code-copy:hover {
  border-color: var(--border-strong);
  color: var(--accent-warm);
}

.code-copy:focus-visible {
  border-radius: 4px;
  outline: 3px solid color-mix(in srgb, var(--accent-primary) 35%, transparent);
  outline-offset: 2px;
}

.code-copy:disabled {
  color: var(--accent-primary);
  cursor: default;
}

.toc {
  margin-top: var(--space-6);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  background: var(--surface-muted);
  padding: var(--space-4) var(--space-5);
}

.toc .eyebrow {
  margin-bottom: var(--space-1);
}

.toc-list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  word-break: keep-all;
}

.toc-list a {
  text-decoration: none;
}

.toc-list a:hover {
  color: var(--accent-primary);
  text-decoration: underline;
}

.toc-list a[aria-current="true"] {
  color: var(--accent-warm-hover);
  font-weight: 650;
}

.manual-toc {
  margin: var(--space-8) 0;
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  background: var(--surface-muted);
  padding: var(--space-5) var(--space-6);
}

.manual-toc h3 {
  margin: 0 0 var(--space-4);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.manual-toc p {
  margin: var(--space-5) 0 var(--space-2);
  font-size: 0.9375rem;
  word-break: keep-all;
}

.manual-toc p:first-of-type {
  margin-top: 0;
}

.manual-toc ul {
  display: grid;
  gap: var(--space-1);
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  word-break: keep-all;
}

.manual-toc a {
  text-decoration: none;
}

.manual-toc a:hover {
  color: var(--accent-primary);
  text-decoration: underline;
}

.article .callout {
  margin: var(--space-8) 0;
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--border-strong);
  border-radius: 0 6px 6px 0;
  background: var(--surface-muted);
  padding: var(--space-4) var(--space-5);
}

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

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

.article .callout > .eyebrow {
  margin-bottom: var(--space-3);
}

.article .callout p,
.article .callout li {
  font-size: 0.9375rem;
}

.article figure {
  margin: var(--space-8) 0;
}

.article figure img {
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  background: var(--surface-panel);
}

.article figcaption {
  margin-top: var(--space-3);
  color: var(--text-tertiary);
  font-size: 0.8125rem;
  line-height: 1.7;
  word-break: keep-all;
}

.article-back {
  margin-top: var(--space-8);
}

.article-tags {
  margin-top: var(--space-5);
}

.term-list {
  border-bottom: 1px solid var(--border-subtle);
}

.term-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-6);
  align-items: start;
  border-top: 1px solid var(--border-subtle);
  padding-block: var(--space-5);
  text-decoration: none;
}

.term-row:hover .term-name {
  text-decoration: underline;
  text-decoration-color: var(--text-primary);
  text-underline-offset: 0.18em;
}

.term-main {
  display: block;
  min-width: 0;
}

.term-name {
  display: block;
  color: var(--text-primary);
  font-size: 1.125rem;
  font-weight: 650;
  line-height: 1.35;
  text-wrap: pretty;
  word-break: keep-all;
}

.term-description {
  display: block;
}

.term-count {
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.45;
  white-space: nowrap;
}

.not-found {
  min-height: 45vh;
}

.site-footer {
  border-top: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.footer-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  padding-block: var(--space-8);
}

.footer-grid p {
  color: var(--text-tertiary);
  font-size: 0.75rem;
  line-height: 1.55;
}

@media (max-width: 719px) {
  /* 좁은 화면에서 축소하면 글자가 읽을 수 없는 크기가 된다(실측 3.3px).
     코드블록과 같이 원래 크기로 두고 pre가 가로로 스크롤되게 한다. */
  .article pre.mermaid svg {
    max-width: none;
  }

  /* 칼럼보다 넓은 표가 페이지 자체를 가로로 넘쳐 화면이 통째로 축소된다.
     표를 블록으로 바꿔 표 안에서만 스크롤되게 한다. */
  .article table {
    display: block;
    width: 100%;
    overflow-x: auto;
  }

  .shell {
    width: min(100% - var(--space-6), var(--content));
  }

  .masthead,
  .footer-grid {
    align-items: flex-start;
    flex-direction: column;
  }

  .memo-intro {
    padding-block: var(--space-10) var(--space-8);
  }

  .note-row {
    grid-template-columns: 1fr;
    gap: var(--space-3);
    padding-block: var(--space-5);
  }

  .note-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .article-shell {
    padding-block: var(--space-10) var(--space-12);
  }

  .archive-shell {
    padding-block: var(--space-10) var(--space-12);
  }

  .term-row {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}