/* ==========================================================================
   regx64 — 공용 스타일
   홈(.home), 프로젝트 상세(.detail), 노트(astro)가 함께 씁니다.
   ========================================================================== */

:root {
  --bg: #FFFFFF;
  --bg-alt: #F5F5F7;
  --ink: #1D1D1F;
  --muted: #6E6E73;
  --faint: #86868B;
  --line: rgba(0, 0, 0, 0.1);
  --line-strong: rgba(0, 0, 0, 0.2);
  --link: #0066CC;

  /* 층별 색. 3D 모형(main.js의 C)과 같은 계열이고, 글자로 쓸 때 대비를 맞춘 값 */
  --c-arch: #2F5FC4;
  --c-sec: #C23B5A;
  --c-os: #176E6E;
  --c-lang: #8A6206;
  --c-app: #7A5BC7;
  --c-arch-on-dark: #6E9BFF;
  --c-os-on-dark: #4FC7C7;
  --accent: var(--ink);

  --sans: "Pretendard Variable", "Pretendard", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, "D2Coding", monospace;

  --gutter: max(1.375rem, calc((100vw - 68rem) / 2));
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  /* 예전 이름을 쓰는 상세 페이지 인라인 SVG/스크립트용 */
  --tone-a: var(--bg-alt);
  --tone-b: var(--bg-alt);
  --tone-dark: #000000;

  --nav-bg: rgba(255, 255, 255, 0.72);
  --hover: #EBEBF0;
  --on-ink: #FFFFFF;          /* var(--ink) 배경 위의 글자 */
  --hero-grad: linear-gradient(180deg, #1D1D1F 30%, #4A4A50 100%);
  color-scheme: light;
}

/* 다크 모드: 기기 설정을 따름 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-alt: #161617;
    --ink: #F5F5F7;
    --muted: #A1A1A6;
    --faint: #6E6E73;
    --line: rgba(255, 255, 255, 0.14);
    --line-strong: rgba(255, 255, 255, 0.26);
    --link: #2997FF;
    --c-arch: #6E9BFF;
    --c-sec: #FF6B8A;
    --c-os: #4FC7C7;
    --c-lang: #E0A82E;
    --c-app: #A78BFA;
    --nav-bg: rgba(22, 22, 23, 0.72);
    --hover: #2C2C2E;
    --on-ink: #000000;
    --hero-grad: linear-gradient(180deg, #F5F5F7 30%, #A1A1A6 100%);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 3.5rem; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  letter-spacing: -0.012em;
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-underline-offset: 0.22em; }
:focus-visible { outline: 2px solid var(--link); outline-offset: 3px; border-radius: 4px; }
::selection { background: rgba(0, 113, 227, 0.18); }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 1rem; top: 0.5rem; z-index: 40; background: var(--bg); color: var(--ink); padding: 0.5rem 0.9rem; border-radius: 999px; box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15); }

.nowrap { white-space: nowrap; }
.muted { color: var(--muted); }

/* 3D 캔버스: 문서 위에 얹고 매 프레임 현재 스크롤 위치로 옮김.
   스크롤이 먼저 일어나도 캔버스가 본문과 같이 움직여서 오브젝트가 뒤처지지 않음 */
#gl {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: 1;
  pointer-events: none;
  will-change: transform;
}

/* ==========================================================================
   상단 바
   ========================================================================== */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 30;
  height: 3rem;
  background: var(--nav-bg);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
  font-size: 0.8125rem;
  letter-spacing: -0.01em;
}
.nav.is-scrolled { border-bottom-color: rgba(0, 0, 0, 0.08); }
.nav.on-dark { background: rgba(22, 22, 23, 0.72); color: #F5F5F7; border-bottom-color: rgba(255, 255, 255, 0.08); }

.nav-inner, .nav:not(:has(.nav-inner)) {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-inner { height: 100%; padding: 0 var(--gutter); }
.nav:not(:has(.nav-inner)) { padding: 0 var(--gutter); }

.nav a { text-decoration: none; opacity: 0.8; transition: opacity 0.2s var(--ease); }
.nav a:hover { opacity: 1; }
.nav .brand { font-weight: 700; font-size: 1.0625rem; letter-spacing: -0.03em; opacity: 1; }
.nav-links { display: flex; align-items: center; gap: 1.75rem; }

/* ==========================================================================
   공용 조각
   ========================================================================== */

.wrap { position: relative; z-index: 2; padding: 0 var(--gutter); }

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 1.1875rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--accent);
}

.section-title {
  margin: 0 0 1.5rem;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.045em;
}
.section-title .dim, .ch-display .dim { color: var(--faint); }

.section-lede {
  max-width: 40rem;
  margin: 0;
  font-size: clamp(1.125rem, 1.6vw, 1.3125rem);
  line-height: 1.5;
  color: var(--muted);
}

/* "자세히 보기 >" */
.more {
  display: inline-flex;
  align-items: center;
  gap: 0.25em;
  color: var(--link);
  text-decoration: none;
  font-size: 1.0625rem;
}
.more::after {
  content: "";
  width: 0.42em;
  height: 0.42em;
  border-right: 1.5px solid currentColor;
  border-top: 1.5px solid currentColor;
  transform: rotate(45deg);
  margin-left: 0.1em;
  transition: transform 0.2s var(--ease);
}
.more:hover { text-decoration: underline; }
.more:hover::after { transform: translateX(2px) rotate(45deg); }

.ch-links { display: flex; flex-wrap: wrap; gap: 0.5rem 2rem; margin: 1.5rem 0 0; }

.btn {
  display: inline-block;
  padding: 0.6rem 1.35rem;
  border-radius: 999px;
  background: #0071E3;
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  transition: background-color 0.2s var(--ease);
}
.btn:hover { background: #0077ED; }

/* 스크롤하면 떠오르는 요소. JS가 없으면 그냥 보임 */
.js .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 1s var(--ease-out), transform 1s var(--ease-out);
}
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
}

/* 어두운 구간 */
.dark {
  --ink: #F5F5F7;
  --muted: #A1A1A6;
  --faint: #6E6E73;
  --line: rgba(255, 255, 255, 0.14);
  --line-strong: rgba(255, 255, 255, 0.28);
  --link: #2997FF;
  background: #000000;
  color: var(--ink);
}
.alt { background: var(--bg-alt); }

/* ==========================================================================
   홈: 첫 화면
   ========================================================================== */

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  padding: 7rem var(--gutter) 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  overflow: hidden;
}
.hero-copy { position: relative; z-index: 2; }
.hero-eyebrow {
  margin: 0 0 1rem;
  font-size: 1.1875rem;
  font-weight: 600;
  color: var(--muted);
}
.hero-title {
  margin: 0;
  font-size: clamp(3rem, 9.5vw, 7.5rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.055em;
  background: var(--hero-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  max-width: 34rem;
  margin: 1.5rem auto 0;
  font-size: clamp(1.125rem, 1.8vw, 1.375rem);
  line-height: 1.45;
  color: var(--muted);
}
.js .hero .reveal:nth-child(2) { transition-delay: 0.08s; }
.js .hero .reveal:nth-child(3) { transition-delay: 0.16s; }

.hero .stage-hero {
  width: 100%;
  flex: 1 1 0;
  height: auto;
  min-height: 17rem;
  max-height: 40rem;
  margin-top: 0.5rem;
}
.scroll-cue {
  position: relative;
  z-index: 2;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8125rem;
  color: var(--muted);
  text-decoration: none;
}
.scroll-cue::after {
  content: "";
  width: 0.55rem;
  height: 0.55rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  animation: cue 2.4s var(--ease) infinite;
}
@keyframes cue { 0%, 100% { transform: translateY(0) rotate(45deg); opacity: 0.5; } 50% { transform: translateY(5px) rotate(45deg); opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .scroll-cue::after { animation: none; } }

/* ==========================================================================
   홈: 층별 목차
   ========================================================================== */

.index { position: relative; background: var(--bg-alt); padding: 8rem 0 7rem; }
.index .eyebrow { --accent: var(--muted); }

.layers {
  list-style: none;
  margin: 4rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.layer {
  display: grid;
  grid-template-columns: 3.5rem 10rem minmax(0, 1fr);
  align-items: baseline;
  gap: 1rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}
.layer-no {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}
.layer-no::before {
  content: "";
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 3px;
  background: var(--accent);
  transform: translateY(-1px);
}
.layer-name { font-size: 1.1875rem; font-weight: 600; letter-spacing: -0.02em; }
.layer-items { display: flex; flex-wrap: wrap; gap: 0.25rem 1.5rem; }
.layer-items a {
  font-size: clamp(1.25rem, 2.2vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  text-decoration: none;
  color: var(--ink);
  transition: color 0.2s var(--ease);
}
.layer-items a:hover { color: var(--accent); }
.js .layers .layer:nth-child(2) { transition-delay: 0.04s; }
.js .layers .layer:nth-child(3) { transition-delay: 0.08s; }
.js .layers .layer:nth-child(4) { transition-delay: 0.12s; }
.js .layers .layer:nth-child(5) { transition-delay: 0.16s; }
.js .layers .layer:nth-child(6) { transition-delay: 0.2s; }

/* ==========================================================================
   홈: 프로젝트 장(chapter)
   ========================================================================== */

.chapter {
  position: relative;
  padding: 9rem 0 7rem;
}
.chapter:not(.alt):not(.dark) { background: var(--bg); }

.ch-head {
  position: relative;
  z-index: 2;
  padding: 0 var(--gutter);
  text-align: center;
}
.ch-layer {
  display: inline-block;
  margin: 0 0 1.25rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  padding: 0.3rem 0.7rem;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 999px;
}
.ch-name {
  margin: 0 0 0.6rem;
  font-size: clamp(1.1875rem, 2vw, 1.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--accent);
}
.ch-display {
  margin: 0;
  font-size: clamp(2.75rem, 7vw, 5.5rem);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.05em;
}
.js .ch-head .reveal:nth-child(2) { transition-delay: 0.06s; }
.js .ch-head .reveal:nth-child(3) { transition-delay: 0.12s; }

.chapter .stage {
  height: min(72vh, 42rem);
  margin: 1.5rem var(--gutter) 0;
}

.ch-body {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 3rem 5rem;
  align-items: start;
  padding: 0 var(--gutter);
  margin-top: 2rem;
}
.ch-lede {
  margin: 0;
  font-size: clamp(1.1875rem, 1.75vw, 1.375rem);
  line-height: 1.5;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--muted);
}
.ch-lede strong { color: var(--ink); font-weight: 600; }

/* 사양 블록: 계측기 느낌의 고정폭 글꼴 */
.spec {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.45;
  border-top: 1px solid var(--line-strong);
}
.spec > div {
  display: grid;
  grid-template-columns: 8.5rem minmax(0, 1fr);
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
}
.spec dt { color: var(--muted); }
.spec dd { margin: 0; color: var(--ink); }
.js .spec.reveal { transition-delay: 0.1s; }

/* 분해 흐름: SYSTEM → SUBSYSTEM → … 모티프 */
.decomp {
  position: relative;
  z-index: 2;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 0.75rem 0;
  margin: 4rem var(--gutter) 0;
  padding: 0;
}
.decomp li > span, .decomp li > small { display: block; }
.decomp li {
  display: flex;
  flex: 1 1 0;
  min-width: 8.5rem;
  flex-direction: column;
  align-items: flex-start;
  position: relative;
  padding: 1rem 1.5rem 0 0;
  border-top: 2px solid var(--line);
}
.decomp li:first-child { border-top-color: var(--accent); }
.decomp li::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.chapter.alt .decomp li::before { background: var(--bg-alt); }
.dark .decomp li::before { background: #000; }
.decomp li > span { font-size: 1.0625rem; font-weight: 600; letter-spacing: -0.02em; }
.decomp li > small { margin-top: 0.2rem; font-family: var(--mono); font-size: 0.75rem; color: var(--muted); }

/* 스크롤에 맞춰 흐름이 왼쪽부터 채워짐 */
.js .decomp li { transition: border-color 0.6s var(--ease); }
.js .decomp.in li { border-top-color: var(--accent); }
.js .decomp.in li:nth-child(2) { transition-delay: 0.15s; }
.js .decomp.in li:nth-child(3) { transition-delay: 0.3s; }
.js .decomp.in li:nth-child(4) { transition-delay: 0.45s; }
.js .decomp.in li:nth-child(5) { transition-delay: 0.6s; }
.js .decomp.in li:nth-child(6) { transition-delay: 0.75s; }

/* ==========================================================================
   홈: 측정 결과
   ========================================================================== */

.results { position: relative; padding: 9rem 0 8rem; }
.results .eyebrow { color: var(--accent); }

.figures {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.5fr) minmax(0, 0.9fr) minmax(0, 0.9fr);
  gap: 3rem 2rem;
  margin: 5rem 0 0;
}
.figures > div { border-top: 1px solid var(--line-strong); padding-top: 1.5rem; }
.figures dt {
  display: flex;
  align-items: baseline;
  gap: 0.1em;
  font-size: clamp(2.75rem, 4.8vw, 4.5rem);
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  letter-spacing: -0.05em;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}
.figures dt .unit { font-size: 0.5em; font-weight: 600; letter-spacing: -0.02em; }
.figures dd { max-width: 14rem; margin: 1rem 0 0; font-size: 1rem; line-height: 1.5; color: var(--muted); }
.js .figures > div:nth-child(2) { transition-delay: 0.08s; }
.js .figures > div:nth-child(3) { transition-delay: 0.16s; }
.js .figures > div:nth-child(4) { transition-delay: 0.24s; }

.breakdown { margin: 6rem 0 0; }
.breakdown figcaption {
  margin: 0 0 1.25rem;
  font-size: 1.1875rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.bd-bar {
  display: flex;
  gap: 3px;
  height: 3.5rem;
  border-radius: 0.875rem;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.06);
}
.bd-seg { display: block; width: var(--w); min-width: 4px; }
.js .bd-seg { width: 0; transition: width 1.4s var(--ease-out); }
.js .breakdown.in .bd-seg { width: var(--w); }
.js .breakdown.in .bd-skew { transition-delay: 0.25s; }
.js .breakdown.in .bd-mac { transition-delay: 0.5s; }
@media (prefers-reduced-motion: reduce) { .js .bd-seg { width: var(--w); transition: none; } }

.bd-comm { background: var(--accent); }
.bd-skew { background: repeating-linear-gradient(135deg, #3A3A3C 0 6px, #2C2C2E 6px 12px); }
.bd-mac { background: #F5F5F7; }

.bd-legend {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem 2rem;
  font-size: 0.9375rem;
}
.bd-legend li { display: grid; grid-template-columns: auto 1fr; gap: 0.2rem 0.6rem; align-items: center; }
.bd-legend i { width: 0.75rem; height: 0.75rem; border-radius: 3px; }
.bd-legend span { color: var(--ink); }
.bd-legend b { grid-column: 2; font-family: var(--mono); font-size: 0.8125rem; font-weight: 400; color: var(--muted); }

.results-note {
  max-width: 44rem;
  margin: 5rem 0 0;
  font-size: clamp(1.1875rem, 1.75vw, 1.375rem);
  line-height: 1.5;
  font-weight: 500;
  color: var(--muted);
}
.results-note strong { color: var(--ink); font-weight: 600; }

/* ==========================================================================
   홈: 그 밖의 프로젝트
   ========================================================================== */

.more-work { position: relative; padding: 9rem 0 8rem; background: var(--bg); }
.more-work .eyebrow { --accent: var(--muted); }

.tiles {
  list-style: none;
  margin: 4rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}
.tile {
  display: flex;
  flex-direction: column;
  padding: 2rem 1.75rem 1.75rem;
  border-radius: 1.5rem;
  background: var(--bg-alt);
}
.tile-layer { margin: 0 0 1rem; font-family: var(--mono); font-size: 0.75rem; color: var(--accent); }
.tile-name { margin: 0 0 0.75rem; font-size: 1.75rem; font-weight: 700; letter-spacing: -0.04em; line-height: 1.15; }
.tile-desc { margin: 0 0 1.5rem; font-size: 1rem; line-height: 1.55; color: var(--muted); }
.tile-spec { margin: auto 0 1.25rem; font-family: var(--mono); font-size: 0.75rem; border-top: 1px solid var(--line); }
.tile-spec > div { display: grid; grid-template-columns: 4rem minmax(0, 1fr); gap: 0.75rem; padding: 0.55rem 0; border-bottom: 1px solid var(--line); }
.tile-spec dt { color: var(--muted); }
.tile-spec dd { margin: 0; }
.tile .more { font-size: 1rem; }
.js .tiles .tile:nth-child(3n+2) { transition-delay: 0.06s; }
.js .tiles .tile:nth-child(3n) { transition-delay: 0.12s; }

/* ==========================================================================
   홈: 노트, 소개
   ========================================================================== */

.notes-teaser { position: relative; padding: 9rem 0 8rem; }
.notes-teaser .eyebrow { --accent: var(--muted); }

.note-rows { list-style: none; margin: 4rem 0 0; padding: 0; border-top: 1px solid var(--line); }
.note-rows a {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}
.note-rows time { font-family: var(--mono); font-size: 0.8125rem; color: var(--muted); }
.nr-title { font-size: clamp(1.125rem, 1.8vw, 1.375rem); font-weight: 600; letter-spacing: -0.025em; line-height: 1.35; transition: color 0.2s var(--ease); }
.note-rows a:hover .nr-title { color: var(--link); }
.nr-tag { font-family: var(--mono); font-size: 0.75rem; color: var(--muted); }
.notes-teaser .ch-links { margin-top: 2rem; }

.about { position: relative; padding: 8rem 0; background: var(--bg); }
.about .eyebrow { --accent: var(--muted); }
.about-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 2rem 5rem; }
.about-text { padding-top: 2.5rem; }
.about-text p { margin: 0 0 1.25rem; font-size: 1.1875rem; line-height: 1.6; }
.about-text .muted { font-size: 1rem; }
.about-text a { color: var(--link); text-decoration: none; }
.about-text a:hover { text-decoration: underline; }
.awards { list-style: none; margin: 1.75rem 0 0; padding: 0; border-top: 1px solid var(--line); }
.awards li { display: grid; grid-template-columns: 6.5rem minmax(0, 1fr); gap: 1rem; padding: 0.7rem 0; border-bottom: 1px solid var(--line); font-size: 0.9375rem; }
.awards time { font-family: var(--mono); font-size: 0.75rem; color: var(--muted); padding-top: 0.15rem; }
.tools { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 2rem !important; }
.tools span {
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--bg);
  color: var(--muted);
  border: 1px solid var(--line);
}

/* ==========================================================================
   바닥
   ========================================================================== */

.foot {
  position: relative;
  z-index: 2;
  background: var(--bg-alt);
  color: var(--muted);
  font-size: 0.75rem;
}
.foot-inner, .foot:not(:has(.foot-inner)) {
  padding: 1.5rem var(--gutter) 2rem;
}
.foot-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem 2rem;
  border-top: 1px solid var(--line);
  margin: 0 var(--gutter);
  padding-left: 0;
  padding-right: 0;
}
.foot:not(:has(.foot-inner)) { border-top: 1px solid var(--line); }
.foot p { margin: 0 0 0.35rem; }
.foot-tag { margin: 0 !important; }
.foot-links { display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; }
.foot a { color: var(--ink); text-decoration: none; opacity: 0.8; }
.foot a:hover { opacity: 1; text-decoration: underline; }

/* ==========================================================================
   프로젝트 상세 페이지
   ========================================================================== */

.panel {
  position: relative;
  min-height: 88vh;
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  align-items: center;
  gap: 2rem;
  padding: 7rem var(--gutter) 4rem;
}
.panel.tone-a, .panel.tone-b { background: var(--bg-alt); }
.panel.tone-dark { background: #000; color: #F5F5F7; --ink: #F5F5F7; --muted: #A1A1A6; }

.copy { position: relative; z-index: 2; max-width: 32rem; }
.name {
  margin: 0 0 0.9rem;
  font-size: 1.1875rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--muted);
}
.detail h1.name { font-size: 1.25rem; }
.headline {
  margin: 0 0 1.5rem;
  font-size: clamp(2.5rem, 5.2vw, 4.25rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.05em;
}
.body { margin: 0 0 1.25rem; font-size: 1.1875rem; line-height: 1.55; color: var(--muted); }
.meta { margin: 0; font-size: 0.875rem; line-height: 1.55; color: var(--faint); }
.meta a { color: var(--ink); }

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.75rem;
  margin-top: 2rem;
}
.actions a:not(.btn) { color: var(--link); text-decoration: none; font-size: 1rem; }
.actions a:not(.btn):hover { text-decoration: underline; }
.tone-dark .actions a:not(.btn) { color: #2997FF; }

.stage { height: min(78vh, 46rem); }

.doc {
  position: relative;
  z-index: 2;
  padding: 2rem var(--gutter) 6rem;
  background: var(--bg);
}
.doc.tone-a { background: var(--bg); }

.doc-sec {
  display: grid;
  grid-template-columns: 14rem minmax(0, 42rem);
  gap: 2.5rem;
  padding: 3.5rem 0;
  border-top: 1px solid var(--line);
}
.doc-sec:first-child { border-top: 0; }
.doc-sec > h2 {
  margin: 0;
  font-size: 1.3125rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.025em;
  align-self: start;
  position: sticky;
  top: 4.5rem;
}
.doc-sec p { margin: 0 0 1rem; line-height: 1.75; }
.doc-sec > div > :last-child { margin-bottom: 0; }
.doc-sec h3 { margin: 2.5rem 0 0.75rem; font-size: 1.0625rem; font-weight: 700; letter-spacing: -0.02em; }
.doc-sec h3:first-child { margin-top: 0; }
.doc-sec a { color: var(--link); text-decoration: none; }
.doc-sec a:hover { text-decoration: underline; }

.plain { margin: 0 0 1rem; padding-left: 1.2rem; line-height: 1.75; }
.plain li { margin-bottom: 0.35rem; }

.pairs { margin: 0; }
.pairs dt { font-weight: 600; }
.pairs dd { margin: 0 0 1rem; color: var(--muted); }
.pairs dd:last-child { margin-bottom: 0; }

.steps { list-style: none; margin: 0; padding: 0; }
.steps li {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--line);
}
.steps li::before {
  content: "";
  flex: none;
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 50%;
  border: 1.5px solid var(--ink);
  transform: translateY(0.05rem);
}
.steps li.done::before { background: var(--ink); }
.steps li.part::before { background: linear-gradient(90deg, var(--ink) 50%, transparent 50%); }
.steps li.plan::before { border-style: dashed; }
.steps .state { margin-left: auto; font-family: var(--mono); font-size: 0.75rem; color: var(--muted); white-space: nowrap; }

figure { margin: 1.5rem 0; }
figure img { display: block; max-width: 100%; height: auto; border-radius: 1rem; }
figcaption { margin-top: 0.6rem; font-size: 0.875rem; color: var(--muted); }

/* 요약 숫자 */
.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2.5rem 2.5rem;
  margin: 0;
}
.stats div { border-top: 1px solid var(--line-strong); padding-top: 1rem; }
.stats dt { font-size: clamp(2rem, 3.6vw, 2.875rem); font-weight: 700; letter-spacing: -0.045em; line-height: 1.1; font-variant-numeric: tabular-nums; }
.stats dd { margin: 0.5rem 0 0; font-size: 0.9375rem; line-height: 1.5; color: var(--muted); }

/* 표 */
.table-wrap { overflow-x: auto; margin: 0 0 1rem; }
.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.data caption { text-align: left; font-weight: 600; font-size: 0.9375rem; padding-bottom: 0.75rem; }
.data th, .data td { padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--line); }
.data thead th { border-bottom: 1px solid var(--line-strong); font-weight: 600; font-size: 0.8125rem; color: var(--muted); text-align: right; }
.data thead th:first-child, .data tbody th { text-align: left; }
.data th:first-child, .data td:first-child { padding-left: 0; }
.data tbody th { font-weight: 500; }
.data td { text-align: right; font-family: var(--mono); font-size: 0.8125rem; }
.data.left td { text-align: left; font-family: inherit; font-size: 0.875rem; white-space: normal; }
.data td.strong { font-weight: 700; }
.data tbody tr.split th, .data tbody tr.split td { border-top: 1px solid var(--line-strong); }

.chart { margin: 2rem 0; padding: 1.5rem; background: var(--bg-alt); border-radius: 1.25rem; }
.chart svg { display: block; width: 100%; height: auto; }
svg .flow { stroke-dasharray: 6 5; animation: flowdash 1.2s linear infinite; }
@keyframes flowdash { to { stroke-dashoffset: -22; } }
@media (prefers-reduced-motion: reduce) { svg .flow { animation: none; } }

.formula {
  margin: 1.25rem 0;
  padding: 1.1rem 1.25rem;
  background: var(--bg-alt);
  border-radius: 1rem;
  font-size: 1.0625rem;
  text-align: center;
}

.code {
  margin: 1.25rem 0;
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  background: #1D1D1F;
  color: #E8E8ED;
  border-radius: 1rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.65;
}

.numbered { margin: 0 0 1rem; padding-left: 1.4rem; }
.numbered li { margin-bottom: 0.6rem; line-height: 1.7; }
.numbered li:last-child { margin-bottom: 0; }

.refs { margin: 0; padding-left: 1.4rem; font-size: 0.9375rem; }
.refs li { margin-bottom: 0.4rem; }

.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
}
.timeline time { color: var(--muted); font-family: var(--mono); font-size: 0.75rem; padding-top: 0.2rem; }

.note { font-size: 0.875rem; color: var(--muted); }

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding-top: 3rem;
  border-top: 1px solid var(--line);
}
.pager a {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.5rem 1.75rem;
  border-radius: 1.25rem;
  background: var(--bg-alt);
  font-size: 1.1875rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  text-decoration: none;
  transition: background-color 0.2s var(--ease);
}
.pager a:hover { background: var(--hover); }
.pager a span { font-size: 0.8125rem; font-weight: 500; letter-spacing: 0; color: var(--muted); }
.pager .next { grid-column: 2; text-align: right; }

/* WebGL을 못 쓰면 빈 자리를 줄임 */
.no-webgl .stage { height: 0 !important; margin: 0 !important; }
.no-webgl .panel { min-height: 0; grid-template-columns: 1fr; }
.no-webgl .hero { min-height: 0; padding-bottom: 5rem; }
.no-webgl .scroll-cue { display: none; }

/* ==========================================================================
   작은 화면
   ========================================================================== */

@media (max-width: 1068px) {
  .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .figures { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .figures dt { font-size: clamp(2.5rem, 8vw, 4.5rem); }
  .ch-body { gap: 2.5rem 3rem; }
}

@media (max-width: 834px) {
  .nav-links { gap: 1.1rem; }

  .hero { padding-top: 6rem; }
  .br-wide { display: none; }
  .hero .stage-hero { flex: none; height: 95vw; min-height: 0; max-height: 30rem; }

  .index { padding: 6rem 0 5rem; }
  .layers { margin-top: 3rem; }
  .layer { grid-template-columns: 3rem minmax(0, 1fr); gap: 0.35rem 0.75rem; }
  .layer-items { grid-column: 2; }

  .chapter { padding: 6.5rem 0 5rem; }
  .ch-head { text-align: left; }
  .chapter .stage { height: 92vw; max-height: 32rem; margin: 1rem 0 0; }
  .ch-body { grid-template-columns: 1fr; margin-top: 1rem; }
  .spec > div { grid-template-columns: 7.5rem minmax(0, 1fr); }

  /* 분해 흐름은 세로로 */
  .decomp { flex-direction: column; gap: 0; margin-top: 3rem; }
  .decomp li {
    flex: none;
    min-width: 0;
    flex-direction: row;
    align-items: baseline;
    gap: 0.75rem;
    padding: 0 0 1.1rem 1.5rem;
    border-top: 0;
    border-left: 2px solid var(--line);
  }
  .decomp li:last-child { padding-bottom: 0; }
  .decomp li:first-child { border-left-color: var(--accent); }
  .decomp li::before { top: 0.35rem; left: -5px; }
  .decomp li > small { margin-top: 0; }
  .js .decomp.in li { border-left-color: var(--accent); }

  .results { padding: 6.5rem 0 5.5rem; }
  .figures { gap: 2.5rem 1.25rem; margin-top: 3.5rem; }
  .breakdown { margin-top: 4rem; }
  .bd-bar { height: 2.75rem; border-radius: 0.625rem; }
  .bd-legend { grid-template-columns: 1fr; }
  .results-note { margin-top: 3.5rem; }

  .more-work { padding: 6.5rem 0 5.5rem; }
  .tiles { grid-template-columns: 1fr; margin-top: 3rem; }
  .notes-teaser { padding: 6.5rem 0 5.5rem; }
  .note-rows a { grid-template-columns: minmax(0, 1fr) auto; gap: 0.35rem 1rem; }
  .note-rows time { grid-column: 1 / -1; }

  .about { padding: 6rem 0; }
  .about-grid { grid-template-columns: 1fr; }
  .about-text { padding-top: 0; }

  .panel {
    grid-template-columns: 1fr;
    min-height: 0;
    padding-top: 6rem;
    padding-bottom: 2rem;
    gap: 0;
  }
  .stage { height: 88vw; max-height: 32rem; }

  .doc-sec { grid-template-columns: 1fr; gap: 1rem; padding: 2.75rem 0; }
  .doc-sec > h2 { position: static; }
  .stats dt { font-size: 1.875rem; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: auto; }
}

@media (max-width: 480px) {
  .nav-links a[href*="github.com"] { display: none; }
  .figures { grid-template-columns: 1fr; gap: 2rem; }
  .figures dt { font-size: 3.5rem; }
  .figures dd { max-width: none; }
}

/* 상단 바의 검색 아이콘과 언어 전환 */
.nav-icon { display: inline-flex; align-items: center; }
.nav-lang { font-weight: 600; font-size: 0.75rem; letter-spacing: 0.02em; }
.updated { margin: 0.6rem 0 0; font-family: var(--mono); font-size: 0.75rem; color: var(--faint); }

/* ==========================================================================
   이력(/cv/), 영어(/en/), 404
   ========================================================================== */

.cv { position: relative; z-index: 2; max-width: 68rem; margin: 0 auto; padding: 8rem var(--gutter) 6rem; }
.cv-head { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1.5rem 3rem; align-items: end; padding-bottom: 3rem; border-bottom: 1px solid var(--line); }
.cv-name { margin: 0 0 0.75rem; font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 800; letter-spacing: -0.05em; line-height: 1.05; }
.cv-name span { font-size: 0.45em; font-weight: 600; letter-spacing: -0.02em; color: var(--muted); margin-left: 0.4em; }
.cv-role { margin: 0 0 1rem; font-family: var(--mono); font-size: 0.8125rem; color: var(--muted); }
.cv-intro { margin: 0; max-width: 38rem; font-size: 1.1875rem; line-height: 1.55; color: var(--muted); }
.cv-links { list-style: none; margin: 0; padding: 0; font-size: 0.9375rem; line-height: 1.9; }
.cv-links a, .cv a { color: var(--link); text-decoration: none; }
.cv a:hover { text-decoration: underline; }
.cv-actions { grid-column: 1 / -1; margin: 0; }
.btn { border: 0; cursor: pointer; font-family: inherit; }

.cv-sec { display: grid; grid-template-columns: 12rem minmax(0, 1fr); gap: 2rem; padding: 3rem 0; border-bottom: 1px solid var(--line); }
.cv-sec > h2 { margin: 0; font-size: 1.1875rem; font-weight: 700; letter-spacing: -0.02em; }
.cv-item { display: grid; grid-template-columns: 7rem minmax(0, 1fr); gap: 1.25rem; }
.cv-item + .cv-item { margin-top: 2.5rem; }
.cv-when { margin: 0; font-family: var(--mono); font-size: 0.75rem; color: var(--muted); padding-top: 0.3rem; }
.cv-item h3 { margin: 0 0 0.4rem; font-size: 1.1875rem; letter-spacing: -0.025em; line-height: 1.4; }
.cv-item h3 a { color: var(--ink); }
.cv-meta { margin: 0 0 0.75rem; font-size: 0.875rem; color: var(--muted); line-height: 1.55; }
.cv-item ul { margin: 0; padding-left: 1.1rem; line-height: 1.7; }
.cv-item p { line-height: 1.7; }
.cv-projects { list-style: none; margin: 0; padding: 0; }
.cv-projects li { display: grid; grid-template-columns: 7rem 10rem minmax(0, 1fr); gap: 1.25rem; padding: 0.7rem 0; border-bottom: 1px solid var(--line); align-items: baseline; line-height: 1.55; }
.cv-projects li:first-child { padding-top: 0; }
.cv-projects li:last-child { border-bottom: 0; }
.cv-projects b a { color: var(--ink); }
.cv-projects span:last-child { color: var(--muted); font-size: 0.9375rem; }
.cv-skills { margin: 0; }
.cv-skills div { display: grid; grid-template-columns: 9rem minmax(0, 1fr); gap: 1rem; padding: 0.6rem 0; border-bottom: 1px solid var(--line); }
.cv-skills div:last-child { border-bottom: 0; }
.cv-skills dt { color: var(--muted); font-size: 0.9375rem; }
.cv-skills dd { margin: 0; }

.en-hero { padding-bottom: 3rem; border-bottom: 1px solid var(--line); }
.eyebrow-en { margin: 0 0 1rem; font-size: 1.1875rem; font-weight: 600; color: var(--muted); }
.en-title { margin: 0 0 1.5rem; font-size: clamp(3rem, 8vw, 6rem); font-weight: 800; line-height: 1.02; letter-spacing: -0.055em; }
.en-lede { margin: 0 0 1.25rem; max-width: 42rem; font-size: clamp(1.1875rem, 1.8vw, 1.375rem); line-height: 1.5; color: var(--muted); }
.ko-tag { display: inline-block; margin-left: 0.2em; padding: 0 0.35em; border: 1px solid var(--line-strong); border-radius: 4px; font-family: var(--mono); font-size: 0.625rem; font-weight: 500; color: var(--muted); vertical-align: 0.2em; }
.en-figures { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1rem; margin: 1.5rem 0; }
.en-figures div { border-top: 1px solid var(--line-strong); padding-top: 0.75rem; }
.en-figures dt { font-size: 1.75rem; font-weight: 700; letter-spacing: -0.04em; color: var(--c-arch); }
.en-figures dd { margin: 0.25rem 0 0; font-size: 0.875rem; color: var(--muted); line-height: 1.45; }
.lang-en { word-break: normal; }

.lost { position: relative; z-index: 2; max-width: 44rem; margin: 0 auto; padding: 10rem var(--gutter) 8rem; min-height: 70vh; }
.lost-code { margin: 0 0 1rem; font-family: var(--mono); font-size: 0.875rem; color: var(--muted); }
.lost-title { margin: 0 0 1.25rem; font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 800; line-height: 1.08; letter-spacing: -0.05em; }
.lost-lede { margin: 0 0 2rem; font-size: 1.1875rem; color: var(--muted); }
.lost-search { display: flex; gap: 0.5rem; margin: 0 0 1rem; }
.lost-search input { flex: 1; min-width: 0; padding: 0.75rem 1rem; border: 1px solid var(--line-strong); border-radius: 12px; background: var(--bg); color: var(--ink); font: inherit; }
.lost-search button { padding: 0 1.25rem; border: 0; border-radius: 12px; background: var(--ink); color: var(--on-ink); font: inherit; font-weight: 600; cursor: pointer; }

@media (max-width: 834px) {
  .cv { padding-top: 6rem; }
  .cv-head { grid-template-columns: 1fr; }
  .cv-sec { grid-template-columns: 1fr; gap: 1.25rem; padding: 2.5rem 0; }
  .cv-item { grid-template-columns: 1fr; gap: 0.35rem; }
  .cv-projects li { grid-template-columns: 1fr; gap: 0.15rem; }
  .en-figures { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* 인쇄(PDF로 저장): 이력 페이지만 깔끔하게 */
@media print {
  @page { size: A4; margin: 14mm 14mm 16mm; }
  :root { --bg: #fff; --bg-alt: #fff; --ink: #000; --muted: #444; --faint: #666; --line: #ccc; --line-strong: #999; --link: #000; }
  body { background: #fff; color: #000; font-size: 10pt; }
  .nav, .foot, .skip, .no-print, #gl { display: none !important; }
  .cv { padding: 0; max-width: none; }
  .cv-head { padding-bottom: 1.2rem; }
  .cv-sec { padding: 1.1rem 0; grid-template-columns: 7rem minmax(0, 1fr); }
  .cv-sec > h2 { break-after: avoid; }
  .cv-item, .cv-projects li, .cv-skills div { break-inside: avoid; }
  .cv-item + .cv-item { margin-top: 1rem; }
  .cv-projects li { grid-template-columns: 5.5rem 8rem minmax(0, 1fr); padding: 0.3rem 0; }
  .cv-name { font-size: 26pt; }
  .cv-intro { font-size: 10.5pt; }
  a { text-decoration: none !important; }
}

.contact { list-style: none; margin: 1.5rem 0 0; padding: 0; border-top: 1px solid var(--line); }
.contact li { display: grid; grid-template-columns: 6.5rem minmax(0, 1fr); gap: 1rem; padding: 0.7rem 0; border-bottom: 1px solid var(--line); font-size: 0.9375rem; }
.contact span { font-family: var(--mono); font-size: 0.75rem; color: var(--muted); padding-top: 0.15rem; }

/* 다크 모드에서 덮어쓸 것 (앞의 기본 규칙보다 뒤에 있어야 함) */
@media (prefers-color-scheme: dark) {
  .nav.is-scrolled { border-bottom-color: rgba(255, 255, 255, 0.1); }
  /* 상세 페이지 도표는 밝은 색으로 그려져 있어서 밝은 판 위에 둠 */
  .chart { background: #F5F5F7; color-scheme: light; }
  .chart figcaption { color: #6E6E73; }
}