@charset "utf-8";

/* ---------------------------------------------------------------- tokens */

:root {
  --bg:          #ffffff;
  --bg-soft:     #faf9f8;
  --bg-code:     #f7f6f4;

  --fg:          #17161a;
  --fg-strong:   #000000;
  --fg-muted:    #6a6763;
  --fg-faint:    #a3a09b;

  --rule:        #e8e5e1;
  --rule-strong: #cfcbc5;

  /* --amber: 선·도형 전용 포인트. --amber-text: 글자에 쓰는 대체값(라이트는 회색조) */
  --amber:       #ffbf00;
  --amber-text:  #000000;
  --amber-soft:  rgba(255, 191, 0, 0.20);

  --sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
          "Apple SD Gothic Neo", "Segoe UI", Roboto, "Noto Sans KR", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", "JetBrains Mono", Menlo,
          Consolas, "D2Coding", monospace;

  --measure: 39rem;
  --gutter:  clamp(1.25rem, 5vw, 2.5rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #100f11;
    --bg-soft:     #161518;
    --bg-code:     #17161a;

    --fg:          #e6e3df;
    --fg-strong:   #ffffff;
    --fg-muted:    #928d87;
    --fg-faint:    #64605c;

    --rule:        #262428;
    --rule-strong: #3a373c;

    --amber:       #ffbf00;
    --amber-text:  #ffbf00;
    --amber-soft:  rgba(255, 191, 0, 0.15);
  }
}

/* ---------------------------------------------------------------- reset */

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  font-feature-settings: "kern" 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

::selection { background: var(--amber-soft); color: var(--fg-strong); }

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

img, video, svg, iframe { max-width: 100%; height: auto; }

/* ---------------------------------------------------------------- layout */

.wrap {
  width: 100%;
  max-width: calc(var(--measure) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.wide { max-width: calc(46rem + var(--gutter) * 2); }

/* ---------------------------------------------------------------- header */

.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
}

.site-header .bar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.35rem 0 1.25rem;
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5em;
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  color: var(--fg);
}

.wordmark::before {
  content: "";
  width: 5px;
  height: 5px;
  background: var(--amber);
  transform: translateY(-0.15em) rotate(45deg);
  transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.wordmark:hover::before { transform: translateY(-0.15em) rotate(135deg); }

.site-nav {
  display: flex;
  gap: 1.25rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
}

.site-nav a { padding-bottom: 2px; border-bottom: 1px solid transparent; }
.site-nav a:hover { color: var(--fg); border-bottom-color: var(--amber); }
.site-nav a[aria-current="page"] { color: var(--fg); }

/* ---------------------------------------------------------------- intro */

.intro {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  align-items: center;
  padding: 3.5rem 0 3rem;
}

.intro img {
  width: 76px;
  height: 76px;
  object-fit: cover;
  filter: grayscale(1) contrast(1.05);
  border: 1px solid var(--rule);
  border-radius: 50%;
}

.intro h1 {
  margin: 0 0 0.35rem;
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.intro p {
  margin: 0;
  color: var(--fg-muted);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.intro .links {
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--fg-faint);
}

.intro .links a { border-bottom: 1px solid var(--rule); padding-bottom: 1px; }
.intro .links a:hover { color: var(--amber-text); border-bottom-color: var(--amber); }

@media (max-width: 30rem) {
  .intro { grid-template-columns: 1fr; gap: 1.25rem; padding: 2.5rem 0 2rem; }
}

/* ---------------------------------------------------------------- index list */

.section-label {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin: 0 0 0.25rem;
}

.section-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
}

.post-list { list-style: none; margin: 0 0 4rem; padding: 0; }

.post-list li { border-bottom: 1px solid var(--rule); }

.post-list li:first-child { border-top: 1px solid var(--rule); }

.post-list a {
  display: grid;
  grid-template-columns: 4.75rem 1fr;
  gap: 0 1.25rem;
  padding: 1.15rem 0;
  position: relative;
}

.post-list a::before {
  content: "";
  position: absolute;
  left: calc(var(--gutter) * -1);
  top: -1px;
  bottom: -1px;
  width: 2px;
  background: var(--amber);
  transform: scaleY(0);
  transition: transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.post-list a:hover::before { transform: scaleY(1); }

.post-list time {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--fg-faint);
  padding-top: 0.42em;
  font-variant-numeric: tabular-nums;
}

.post-list h2 {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.5;
  transition: color 0.2s ease;
}

.post-list a:hover h2 { color: var(--amber-text); }

.post-list p {
  grid-column: 2;
  margin: 0.25rem 0 0;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--fg-muted);
}

.post-list .tags { grid-column: 2; margin-top: 0.5rem; }

@media (max-width: 30rem) {
  .post-list a { grid-template-columns: 1fr; gap: 0.3rem; }
  .post-list time { padding-top: 0; order: -1; }
  .post-list p, .post-list .tags { grid-column: 1; }
}

/* ---------------------------------------------------------------- tags */

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--fg-faint);
}

.tags span, .tags a {
  border: 1px solid var(--rule);
  padding: 0.1rem 0.45rem;
  line-height: 1.6;
}

.tags a:hover { color: var(--amber-text); border-color: var(--amber); }

/* ---------------------------------------------------------------- article */

.post-header { padding: 4rem 0 0; }

.post-header .kicker {
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-faint);
}

.post-header h1 {
  margin: 0.9rem 0 0;
  font-size: clamp(1.75rem, 5.5vw, 2.25rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.028em;
  color: var(--fg-strong);
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin: 1.1rem 0 0;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--fg-faint);
}

.post-meta .sep { color: var(--rule-strong); }

.tag-header { padding-bottom: 2.5rem; }

.tag-header .count {
  margin: 1.1rem 0 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--fg-faint);
}

.tag-back { margin: 2.5rem 0 0; }

.prose { padding: 2.5rem 0 1rem; }

.prose > * { margin: 0 0 1.35em; }
.prose > *:last-child { margin-bottom: 0; }

.prose h2, .prose h3, .prose h4 {
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.4;
  color: var(--fg-strong);
  scroll-margin-top: 2rem;
}

.prose h2 { font-size: 1.3125rem; margin: 3.2em 0 1em; }
.prose h3 { font-size: 1.0625rem; margin: 2.6em 0 0.8em; }
.prose h4 { font-size: 0.9375rem; margin: 2.2em 0 0.7em; color: var(--fg-muted); }

.prose h2 .anchor,
.prose h3 .anchor {
  margin-left: 0.4em;
  color: var(--amber-text);
  opacity: 0;
  font-weight: 400;
  transition: opacity 0.2s ease;
}

.prose h2:hover .anchor,
.prose h3:hover .anchor { opacity: 1; }

.prose a {
  color: var(--fg);
  border-bottom: 1px solid var(--rule-strong);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.prose a:hover { color: var(--amber-text); border-bottom-color: var(--amber); }

.prose strong { font-weight: 650; color: var(--fg-strong); }

.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: 0.35em 0; }
.prose li::marker { color: var(--fg-faint); }

.prose blockquote {
  margin-left: 0;
  margin-right: 0;
  padding: 0.1em 0 0.1em 1.35em;
  border-left: 1px solid var(--amber);
  color: var(--fg-muted);
}

.prose blockquote > *:last-child { margin-bottom: 0; }

.prose hr {
  border: 0;
  height: 1px;
  background: var(--rule);
  margin: 3em 0;
  position: relative;
  overflow: visible;
}

.prose hr::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 5px;
  height: 5px;
  background: var(--amber);
  transform: translate(-50%, -50%) rotate(45deg);
}

.prose img { display: block; border: 1px solid var(--rule); }

.prose figure { margin: 2em 0; }

.prose figcaption {
  margin-top: 0.7em;
  font-size: 0.8125rem;
  color: var(--fg-faint);
  text-align: center;
}

/* ---------------------------------------------------------------- code */

.prose code {
  font-family: var(--mono);
  font-size: 0.855em;
  background: var(--bg-code);
  border: 1px solid var(--rule);
  padding: 0.1em 0.35em;
  color: var(--fg);
}

.prose pre {
  background: var(--bg-code);
  border: 1px solid var(--rule);
  padding: 1.05rem 1.15rem;
  overflow-x: auto;
  font-size: 0.8125rem;
  line-height: 1.7;
  tab-size: 2;
}

.prose pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: inherit;
}

.prose pre[data-lang]::before {
  content: attr(data-lang);
  display: block;
  margin: -0.35rem 0 0.85rem;
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-faint);
}

/* greyscale syntax palette — amber reserved for keywords */
.hljs-comment, .hljs-quote { color: var(--fg-faint); font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-literal,
.hljs-doctag, .hljs-name, .hljs-meta .hljs-keyword { color: var(--amber-text); }
.hljs-string, .hljs-regexp, .hljs-addition, .hljs-attribute,
.hljs-meta .hljs-string { color: var(--fg-muted); }
.hljs-number, .hljs-symbol, .hljs-bullet, .hljs-link,
.hljs-selector-attr, .hljs-selector-pseudo { color: var(--fg-muted); }
.hljs-title, .hljs-section, .hljs-title.function_,
.hljs-title.class_ { color: var(--fg-strong); font-weight: 600; }
.hljs-attr, .hljs-variable, .hljs-template-variable,
.hljs-type, .hljs-selector-class, .hljs-selector-id { color: var(--fg); }
.hljs-built_in, .hljs-class .hljs-title { color: var(--fg); font-weight: 600; }
.hljs-meta, .hljs-punctuation, .hljs-operator { color: var(--fg-faint); }
.hljs-deletion { color: var(--amber-text); }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 700; }

/* ---------------------------------------------------------------- table */

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.prose th, .prose td {
  border-bottom: 1px solid var(--rule);
  padding: 0.6em 0.8em 0.6em 0;
  text-align: left;
  vertical-align: top;
}

.prose thead th {
  border-bottom: 1px solid var(--rule-strong);
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
  font-weight: 500;
}

.table-scroll { overflow-x: auto; }

/* ---------------------------------------------------------------- post foot */

.post-foot {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

.post-foot .tags { margin-bottom: 2rem; }

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.post-nav a {
  display: block;
  padding: 1rem 0;
  border-top: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.post-nav a:hover { border-top-color: var(--amber); }

.post-nav .dir {
  display: block;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 0.35rem;
}

.post-nav .t { font-size: 0.9375rem; font-weight: 500; line-height: 1.45; }
.post-nav a:hover .t { color: var(--amber-text); }
.post-nav .next { text-align: right; }

@media (max-width: 30rem) {
  .post-nav { grid-template-columns: 1fr; gap: 0; }
  .post-nav .next { text-align: left; }
}

/* ---------------------------------------------------------------- footer */

.site-footer {
  margin-top: 5rem;
  border-top: 1px solid var(--rule);
  padding: 1.75rem 0 3.5rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--fg-faint);
}

.site-footer .bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
}

.site-footer a:hover { color: var(--amber-text); }

/* ---------------------------------------------------------------- misc */

.empty {
  padding: 4rem 0;
  color: var(--fg-faint);
  font-family: var(--mono);
  font-size: 0.8125rem;
}

.notfound {
  padding: 7rem 0 6rem;
  text-align: center;
}

.notfound .code {
  font-family: var(--mono);
  font-size: 3rem;
  letter-spacing: 0.1em;
  color: var(--amber-text);
}

.notfound p { color: var(--fg-muted); margin: 1rem 0 2rem; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
}

.back-link:hover { color: var(--amber-text); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; scroll-behavior: auto; }
}