:root {
  --paper: #fafaf6;
  --ink: #333f37;
  --muted: #73796f;
  --green: #667b63;
  --line: #e1e4d9;
  --serif: "Noto Serif KR", "Batang", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --mono: "Source Code Pro", ui-monospace, "SF Mono", Menlo, "Apple SD Gothic Neo", monospace;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
/* 종이 결: 아주 옅은 노이즈만 깐다 */
body { margin: 0; color: var(--ink); background-color: var(--paper); font-family: var(--sans); font-size: 15px; -webkit-font-smoothing: antialiased;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='260' height='260'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.75' numOctaves='2' seed='3'/%3E%3CfeColorMatrix values='0 0 0 0 .45 0 0 0 0 .42 0 0 0 0 .35 0 0 0 .16 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E"); }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible { outline: 2px solid var(--green); outline-offset: 4px; border-radius: 3px; }
main:focus { outline: none; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3 { font-family: var(--serif); font-weight: 400; word-break: keep-all; overflow-wrap: anywhere; }
.shell { width: min(100% - 96px, 1000px); margin-inline: auto; }
.skip-link { position: absolute; top: -80px; left: 24px; z-index: 2; padding: 12px 20px; background: var(--ink); color: var(--paper); }
.skip-link:focus { top: 12px; }

.site-header { display: flex; align-items: center; justify-content: space-between; min-height: 100px; }
.brand { display: inline-flex; align-items: center; gap: 9px; white-space: nowrap; font-family: var(--serif); font-size: 22px; font-weight: 500; }
.site-header nav { display: flex; gap: 28px; font-size: 14px; }
.site-header nav a { padding: 8px 0; color: var(--muted); white-space: nowrap; }
.site-header nav a:hover { color: var(--ink); }
.site-header nav a[aria-current] { color: var(--ink); text-decoration: underline; text-underline-offset: 8px; }

.intro { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 16px; padding: 48px 0 64px; }
.intro h1 { margin: 0; font-size: clamp(26px, 3.2vw, 36px); letter-spacing: -.04em; line-height: 1.6; }
.intro-description { margin: 20px 0 0; color: var(--muted); font-size: 15px; line-height: 1.9; word-break: keep-all; }
.intro-landscape { width: 108%; max-width: none; margin-left: -2%; mix-blend-mode: multiply; }

.collection { border-top: 1px solid var(--line); padding-top: 32px; }
.collection-heading { display: flex; justify-content: space-between; align-items: baseline; }
.collection-heading h2 { margin: 0; font-size: 22px; letter-spacing: -.03em; }
.collection-heading p { margin: 0; font-size: 12px; color: var(--muted); }
.filters { display: flex; flex-wrap: wrap; gap: 4px 20px; margin: 16px 0 4px; }
.filters button { padding: 8px 0; border: 0; border-bottom: 1px solid transparent; background: none; color: var(--muted); font-size: 14px; cursor: pointer; }
.filters button:hover { color: var(--ink); }
.filters button[aria-pressed="true"] { color: var(--ink); border-bottom-color: var(--ink); }

.writing-grid { display: grid; grid-template-columns: 1fr 1fr; column-gap: 60px; }
.writing-card { min-width: 0; border-bottom: 1px solid var(--line); }
.writing-card-link { display: flex; flex-direction: column; align-items: flex-start; height: 100%; padding: 28px 0 28px; }
.topic { color: var(--muted); font-size: 12px; }
.writing-card h3 { margin: 6px 0 8px; font-size: 20px; line-height: 1.6; letter-spacing: -.03em; transition: color .15s; }
.writing-card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; word-break: keep-all; }
.writing-card-link:hover h3 { color: var(--green); }
.collection-note { margin: 32px 0 0; color: var(--muted); font-size: 12px; }

/* 썸네일: 종이색 배경 위에 그려 multiply로 섞고, 가장자리는 종이로 스며들게 */
.thumb { width: 100%; height: auto; aspect-ratio: 3 / 2; object-fit: cover; mix-blend-mode: multiply;
  -webkit-mask-image: radial-gradient(closest-side, #000 62%, transparent 100%); mask-image: radial-gradient(closest-side, #000 62%, transparent 100%); }
.writing-card .thumb { margin-bottom: 8px; }
.reading-page > .thumb { aspect-ratio: 2 / 1; margin: -6px 0 10px; }

.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 72px; padding: 24px 0 32px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.site-footer p { margin: 0; }

.reading-page { max-width: 660px; margin: 40px auto 90px; }
.back-link { display: inline-block; color: var(--muted); font-size: 13px; line-height: 2; }
.back-link:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 5px; }
.writing-header { margin: 44px 0 32px; }
.reading-page h1 { margin: 8px 0 12px; font-size: 32px; line-height: 1.6; letter-spacing: -.04em; }
.writing-description { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.8; word-break: keep-all; }

.prose { font-size: 16px; line-height: 2.1; overflow-wrap: anywhere; }
.prose p { margin: 0 0 24px; }
.prose h2 { margin: 44px 0 16px; font-size: 22px; line-height: 1.7; letter-spacing: -.03em; }
.prose h3 { margin-top: 32px; font-size: 19px; }
.prose a { color: var(--green); text-decoration: underline; text-underline-offset: 4px; }
.prose blockquote { margin: 28px 0; padding: 2px 20px; border-left: 2px solid var(--line); color: var(--muted); }
.prose blockquote p { margin: 0; }
.prose ul, .prose ol { padding-left: 24px; }
.prose img { margin: 24px auto; border-radius: 3px; }
.prose pre { padding: 18px; overflow-x: auto; background: #f0f1e9; border-radius: 4px; line-height: 1.7; font-size: 13px; font-family: var(--mono); }
.prose code { padding: .15em .4em; background: #f4f2ea; border: 1px solid #e6e3d6; border-radius: 4px; color: #a85a43; font-family: var(--mono); font-size: .85em; }
.prose pre code { padding: 0; background: none; border: 0; color: inherit; }
.prose table { display: block; max-width: 100%; overflow-x: auto; border-collapse: collapse; }
.prose th, .prose td { padding: 8px 14px; border: 1px solid var(--line); text-align: left; }

/* 코드 블록: 창 모양 (신호등 제목 막대 + 줄 번호 열). 위의 표 스타일보다 뒤에 둬야 덮어쓴다 */
.prose div.highlighter-rouge { position: relative; margin: 32px 0; overflow: hidden; border: 1px solid var(--line); border-radius: 8px; background: #fffefb; box-shadow: 0 5px 20px rgba(70, 80, 60, .1); }
.prose div.highlighter-rouge::before { content: attr(data-language); display: flex; align-items: center; height: 34px; padding: 0 12px 0 68px; border-bottom: 1px solid var(--line); background-color: #f6f5ee; color: #8a8f83; font: 11px/1 var(--mono); letter-spacing: .5px; text-transform: uppercase;
  background-image: radial-gradient(5px at 18px 50%, #e8a19a 5px, transparent 6px), radial-gradient(5px at 34px 50%, #ecc880 5px, transparent 6px), radial-gradient(5px at 50px 50%, #a0c79b 5px, transparent 6px); background-repeat: no-repeat; }
.prose div.highlighter-rouge .highlight { overflow-x: auto; }
.prose .rouge-table { display: table; width: 100%; margin: 0; border-collapse: collapse; }
.prose .rouge-table td { padding: .8em 0; border: 0; vertical-align: top; }
.prose div.highlighter-rouge pre { margin: 0; padding: 0; overflow: visible; background: none; border-radius: 0; font-size: 13px; line-height: 1.6; }
.prose .rouge-table .rouge-gutter { width: 1%; padding-inline: 1.2em 1em; border-right: 1px solid var(--line); text-align: right; user-select: none; }
.prose .rouge-gutter pre { color: #b3b6a9; }
.prose .rouge-table .rouge-code { padding-inline: 1.2em; }
.prose .highlight .gd, .prose .highlight .gi { display: block; margin-inline: -1.2em; padding-inline: 1.2em; }
.prose .copy-code { position: absolute; top: 6px; right: 8px; height: 22px; padding: 0 9px; border: 1px solid var(--line); border-radius: 5px; background: #fffefb; color: #8a8f83; font: 11px/1 var(--mono); cursor: pointer; }
.prose .copy-code:hover { color: var(--ink); }
/* 코드 색 (rouge) */
.highlight .c, .highlight .c1, .highlight .cm, .highlight .cp { color: #7d8471; font-style: italic; }
.highlight .k, .highlight .kd, .highlight .kn, .highlight .kr, .highlight .kc, .highlight .ow { color: #6e5a8c; }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sb, .highlight .sr { color: #5f7a45; }
.highlight .mi, .highlight .mf, .highlight .mh, .highlight .no, .highlight .kt { color: #9a6a4a; }
.highlight .nf, .highlight .nc, .highlight .nb, .highlight .nt, .highlight .na { color: #3f6f82; }
.highlight .o, .highlight .p { color: #73796f; }
.highlight .gd { background: rgba(196, 120, 108, .18); }
.highlight .gi { background: rgba(140, 170, 120, .22); }

.writing-end { margin-top: 48px; }
/* 이어서 읽기: 글 끝의 다른 글 세 편 */
.related { margin: 8px 0 28px; padding-top: 28px; border-top: 1px solid var(--line); }
.related h2 { margin: 0 0 16px; font-size: 18px; letter-spacing: -.03em; }
.related ul { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin: 0; padding: 0; list-style: none; }
.related a { display: flex; flex-direction: column; gap: 4px; }
.related .thumb { margin-bottom: 4px; }
.related strong { font-family: var(--serif); font-size: 15px; font-weight: 400; line-height: 1.6; word-break: keep-all; transition: color .15s; }
.related a:hover strong { color: var(--green); }
.sample-note { margin: 0 0 8px; color: var(--muted); font-size: 12px; }
.about-page h1 { margin-top: 0; }
.about-profile { float: right; width: 240px; margin: -8px -24px 12px 28px; mix-blend-mode: multiply;
  -webkit-mask-image: radial-gradient(closest-side, #000 78%, transparent 100%); mask-image: radial-gradient(closest-side, #000 78%, transparent 100%); }
.about-page .prose { display: flow-root; }
.about-page .back-link { margin-top: 24px; }
.not-found { padding: 48px 0; }
/* 404: 고양이 방과 같은 무대(assets/cats.js)에서 윗부분만 잘라 보여 준다. 무대 아래를 방 아래에 붙인다 */
.not-found .room { aspect-ratio: 960 / 300; margin: 8px 0 16px; }
.not-found .stage { top: auto; bottom: 0; transform-origin: 0 100%; }
.not-found p { color: var(--muted); }
.not-found .back-link { margin-top: 8px; }

/* 고양이 (assets/cats.js): 화면 아래를 돌아다니는 도트 스프라이트. 글 읽기를 방해하지 않도록 몸통 말고는 클릭이 통과한다 */
.cats { position: fixed; inset: auto 0 0; height: 0; z-index: 5; pointer-events: none; }
.cat { position: absolute; left: 0; bottom: 0; width: 72px; height: 64px; transform-origin: 50% 100%; }
.cat::before { content: ""; position: absolute; inset: auto 16px 0; height: 5px; background: radial-gradient(closest-side, rgba(80, 95, 75, .22), transparent); }
.sprite { position: absolute; inset: 0; background-size: 432px 768px; background-repeat: no-repeat; image-rendering: pixelated; pointer-events: none; }
.hit { position: absolute; left: 16px; right: 16px; bottom: 2px; height: 38px; pointer-events: auto; cursor: pointer; }
.bubble, .heart, .treat { position: absolute; z-index: 6; pointer-events: none; }
.bubble { padding: 3px 9px; border: 1px solid var(--line); border-radius: 10px; background: #fffefb; font-size: 12px; white-space: nowrap; animation: bubble 2.2s ease-out forwards; }
.heart { color: #e59a92; font-size: 14px; animation: heart 1.4s ease-out forwards; }
.treat { animation: drop .45s ease-in; transform: translateX(-50%); }
@keyframes bubble { 0% { opacity: 0; transform: translate(-50%, 6px); } 12%, 80% { opacity: 1; transform: translate(-50%, 0); } 100% { opacity: 0; transform: translate(-50%, -6px); } }
@keyframes heart { from { opacity: 1; transform: translate(-50%, 0); } to { opacity: 0; transform: translate(-50%, -34px); } }
@keyframes drop { from { opacity: 0; transform: translate(-50%, -140px); } to { opacity: 1; transform: translate(-50%, 0); } }
@media (prefers-reduced-motion: reduce), print { .cats { display: none; } }

/* 고양이 방 (/cats/): 960x460 무대를 폭에 맞춰 줄인다. 뒤 그림 < 고양이 < 앞 그림(세탁기) */
.cat-page h1 { margin: 24px 0 8px; font-size: 32px; letter-spacing: -.04em; }
.cat-lead { margin: 0 0 20px; color: var(--muted); }
.room { position: relative; width: 100%; aspect-ratio: 960 / 460; }
.stage { position: absolute; left: 0; top: 0; width: 960px; height: 460px; transform-origin: 0 0; }
.stage > svg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.room-back { z-index: 1; }
.room-front { z-index: 3; }
.room-cats { position: absolute; z-index: 2; left: 0; bottom: 60px; width: 960px; height: 0; }
.cat-hint { margin: 8px 0 32px; color: var(--muted); font-size: 13px; text-align: center; }
.cat-profiles { max-width: 660px; margin: 0 auto; }
.cat-profile { display: grid; grid-template-columns: 216px 1fr; gap: 28px; align-items: center; padding: 28px 0; border-top: 1px solid var(--line); }
.cat-avatar { width: 216px; height: 192px; overflow: hidden; }
.cat-avatar i { display: block; width: 72px; height: 64px; transform: scale(3); transform-origin: 0 0; background-size: 432px 768px; background-position: 0 -256px; background-repeat: no-repeat; image-rendering: pixelated; }
.cat-profile h2 { margin: 0 0 8px; font-size: 22px; }
.cat-profile p { margin: 0 0 10px; line-height: 1.9; word-break: keep-all; }
.cat-profile .origin { color: var(--muted); }

@media (min-width: 1440px) {
  .intro { padding-block: 64px 80px; }
}
@media (max-width: 760px) {
  .shell { width: calc(100% - 48px); }
  .site-header { min-height: 84px; }
  .site-header nav { gap: 22px; font-size: 13px; }
  .intro { gap: 0; padding: 28px 0 40px; }
  .intro h1 { font-size: 26px; }
  .intro-landscape { width: 120%; margin-left: -12%; }
  .writing-grid { column-gap: 32px; }
  .writing-card h3 { font-size: 18px; }
  .writing-card p { font-size: 13px; }
  .reading-page { margin-top: 28px; }
}
@media (max-width: 540px) {
  .brand { font-size: 18px; }
  .brand img { display: none; }
  .cat-profile { grid-template-columns: 1fr; gap: 12px; }
  .cat-avatar { width: 144px; height: 128px; }
  .cat-avatar i { transform: scale(2); }
  .site-header nav { gap: 16px; }
  .intro { grid-template-columns: 1fr; padding-top: 24px; padding-bottom: 28px; }
  .intro h1 { font-size: 27px; }
  .intro-landscape { width: 88%; max-width: 330px; margin: -8px -8px -14px auto; }
  .collection { padding-top: 24px; }
  .filters { gap: 0 16px; }
  .filters button { min-height: 40px; }
  .writing-grid { grid-template-columns: 1fr; }
  .writing-card h3 { font-size: 20px; }
  .site-footer { flex-direction: column; align-items: flex-start; gap: 8px; margin-top: 48px; }
  .reading-page { margin-bottom: 55px; }
  .reading-page h1 { font-size: 27px; }
  .writing-header { margin-top: 32px; }
  .prose { font-size: 15px; line-height: 2.05; }
  .prose h2 { font-size: 20px; }
  .about-profile { float: none; width: 200px; margin: 0 auto 16px; }
  .related ul { grid-template-columns: 1fr; gap: 14px; }
  .related a { display: grid; grid-template-columns: auto 1fr; column-gap: 14px; align-content: center; }
  .related .thumb { grid-row: span 2; width: 96px; margin: 0; }
  .related a > span, .related a > strong { grid-column: 2; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}