/* ==========================================================================
   style.css
   순서: base → layout → components → sections → detail page → utilities → media
   ========================================================================== */

/* ==========================================================================
   1. Base
   ========================================================================== */

body {
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-body);
  font-size: 16px;
}

::selection {
  background: var(--c-ink);
  color: var(--c-invert);
}

.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 10000;
  padding: 12px 18px;
  background: var(--c-ink);
  color: var(--c-invert);
  font: 700 var(--t-label) / 1 var(--font-display);
  letter-spacing: .06em;
  transform: translateY(-120%);
}

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

/* ==========================================================================
   2. Layout
   ========================================================================== */

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

.section {
  padding-top: var(--sec-pt);
  padding-bottom: var(--sec-pb);
  scroll-margin-top: var(--header-h);
}

/* 섹션 제목 행 — 제목 왼쪽, 보조 컨트롤 오른쪽 */
.section__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--sec-title-h);
  margin-bottom: 15px;   /* 제목 아래 여백 */
}

.section__title {
  font: 700 var(--t-sec-title) / 1 var(--font-display);
  letter-spacing: -.01em;
  text-transform: uppercase;
}

.section__more {
  flex: none;
  font: 700 var(--t-label) / 1 var(--font-display);
  letter-spacing: .06em;
  text-transform: uppercase;
}

/* ==========================================================================
   3. Components
   ========================================================================== */

/* --- 로고 락업 ------------------------------------------------------------ */
.logo {
  display: block;
  text-align: center;
}

.logo__name {
  display: block;
  font-family: var(--font-logo);
  font-optical-sizing: auto;   /* Didone 특유의 얇은 세로획을 살리는 핵심 */
  font-size: var(--t-logo-1);
  font-weight: 400;
  line-height: 1;
  letter-spacing: .02em;
}

.logo__sub {
  display: block;
  margin-top: .34em;
  font: 500 var(--t-logo-2) / 1 var(--font-display);
  letter-spacing: .34em;
  text-indent: .34em;   /* 자간 때문에 오른쪽으로 밀리는 만큼 보정 */
}

/* --- 헤더 ---------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  background: var(--c-bg);
  border-bottom: 1px solid transparent;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.site-header.is-pinned { border-bottom-color: var(--c-line); }
.site-header.is-hidden { transform: translateY(-100%); }

.site-header__inner {
  position: relative;
  height: var(--header-h);
  padding: 40px var(--gutter) 26px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
}

.site-header__aside {
  position: absolute;
  top: 40px;
  right: var(--gutter);
  display: flex;
  align-items: center;
  gap: 14px;
}

.btn-contact {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 14px;
  background: var(--c-ink);
  color: var(--c-invert);
  font: 600 var(--t-nav) / 1 var(--font-display);
  letter-spacing: .04em;
  text-transform: uppercase;
}

.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 0 6px;
}

.hamburger span {
  display: block;
  height: 1px;
  background: var(--c-ink);
}

.site-nav {
  display: flex;
  gap: clamp(20px, 3.4vw, 46px);
}

.site-nav__link {
  position: relative;
  padding-bottom: 4px;
  font: 700 var(--t-nav) / 1 var(--font-display);
  letter-spacing: .1em;
  text-transform: uppercase;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--c-ink);
  opacity: 0;
  transition: opacity .15s var(--ease);
}

.site-nav__link.is-active::after { opacity: 1; }

/* --- 전체화면 오버레이 ----------------------------------------------------- */
.gnb {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--c-ink);
  color: var(--c-invert);
  opacity: 0;
  visibility: hidden;
  overflow-y: auto;
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
}

.gnb.is-open {
  opacity: 1;
  visibility: visible;
}

.gnb__inner {
  position: relative;
  min-height: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: 40px var(--gutter) 56px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.gnb__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}

.gnb__top .logo { text-align: left; }
.gnb__top .logo__name { font-size: clamp(22px, 2.6vw, 34px); }
.gnb__top .logo__sub { font-size: clamp(11px, 1vw, 14px); }

.gnb__close {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  color: var(--c-invert);
}

.gnb__close svg { width: 20px; height: 20px; }

.gnb__body {
  position: relative;
  z-index: 1;
  flex: 1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-content: center;
  padding: clamp(40px, 7vw, 80px) 0;
}

.gnb__menu {
  display: flex;
  flex-direction: column;
  gap: clamp(8px, 1.4vw, 18px);
}

.gnb__menu a {
  display: inline-block;
  width: fit-content;
  color: var(--c-muted);
  font: 700 var(--t-gnb) / 1 var(--font-display);
  letter-spacing: .1em;
  transition: color .2s var(--ease);
}

.gnb__side {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  min-width: 200px;
}

.gnb__links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font: 400 16px / 1.4 var(--font-body);
}

.gnb__links a { transition: opacity .2s var(--ease); }

.gnb__rule {
  width: 100%;
  height: 1px;
  margin: 10px 0;
  border: 0;
  background: rgba(255, 255, 255, .25);
}

.gnb__based {
  font: 500 var(--t-label) / 1.4 var(--font-display);
  letter-spacing: .08em;
  color: var(--c-muted);
  text-transform: uppercase;
}

.gnb__ghost {
  position: absolute;
  left: 50%;
  bottom: -15%;
  transform: translateX(-50%);
  z-index: 0;
  font-family: var(--font-logo);
  font-optical-sizing: auto;
  font-size: 60vh;
  line-height: 1;
  color: rgba(255, 255, 255, .06);
  pointer-events: none;
  user-select: none;
}

/* --- 원형 소셜 아이콘 ------------------------------------------------------ */
.social {
  display: flex;
  gap: 10px;
}

.social a {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(255, 255, 255, .35);
  border-radius: 50%;   /* 소셜 아이콘만 원형 허용 */
  transition: background-color .2s var(--ease), color .2s var(--ease);
}

.social svg {
  width: 17px;
  height: 17px;
  fill: currentColor;
}

/* --- TOP 버튼 ------------------------------------------------------------- */
.to-top {
  position: fixed;
  right: clamp(16px, 3vw, 40px);
  bottom: clamp(16px, 3vw, 40px);
  z-index: 800;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 8px;
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease);
}

.to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.to-top svg { width: 14px; height: 14px; }

.to-top span {
  font: 700 12px / 1 var(--font-display);
  letter-spacing: .1em;
}

/* --- 카드 공통 ------------------------------------------------------------ */
.card { display: block; }

.card__media {
  background: var(--c-band);
  overflow: hidden;
}

.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card__tag {
  margin-top: 12px;
  font: 500 var(--t-label) / 1.4 var(--font-display);
  color: var(--c-ink);
}

.card__title {
  margin-top: 6px;
  font-family: var(--font-body);
  font-weight: 600;
  line-height: 1.37;
  letter-spacing: -.002em;
}

.card__desc {
  margin-top: 8px;
  font-size: 16px;
  line-height: 1.55;
  color: var(--c-meta);
}

.card__meta {
  margin-top: 10px;
  font: 400 var(--t-meta) / 1.4 var(--font-body);
  color: var(--c-meta);
}

.card__meta .sep { padding: 0 8px; }

/* ==========================================================================
   4. Sections
   ========================================================================== */

/* --- HERO ---------------------------------------------------------------- */
.hero {
  position: relative;
  margin-top: var(--header-h);
  height: min(calc(100vh - var(--header-h)), 720px);   /* svh 미지원 폴백 */
  height: min(calc(100svh - var(--header-h)), 720px);
  min-height: 420px;
  background: #141414;
  overflow: hidden;
  scroll-margin-top: var(--header-h);
}

.hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* 위를 기준으로 잘라야 목업 창의 상단 탭이 반쯤 잘리지 않는다 */
  object-position: center top;
}

/* 목업이 칼라 코드 화면이라 글자 뒤가 복잡하다. 아래쪽을 더 눌러 제목을
   읽히게 하되, 위쪽 창 상단 바는 그대로 보이게 둔다. */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top,
    rgba(0, 0, 0, .78) 0%, rgba(0, 0, 0, .5) 30%, rgba(0, 0, 0, 0) 62%);
  pointer-events: none;
}

.hero__copy {
  position: absolute;
  left: 50%;
  bottom: 22%;
  z-index: 1;
  width: min(100%, var(--container));
  padding-inline: var(--gutter);
  transform: translateX(-50%);
  text-align: center;
  color: var(--c-invert);
}

.hero__eyebrow {
  font: 500 15px / 1 var(--font-display);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.hero__eyebrow .sep { padding: 0 8px; }

.hero__title {
  margin-top: 16px;
  font-family: var(--font-body);
  font-size: var(--t-hero);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -.02em;
}

/* --- WORK ---------------------------------------------------------------- */
.work__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.work .card__media { aspect-ratio: 3 / 2; }
.work .card__title { font-size: var(--t-card-lg); }

/* --- LAB ----------------------------------------------------------------- */
.lab {
  position: relative;
  padding-top: var(--sec-pt);
  padding-bottom: var(--sec-pb);
  scroll-margin-top: var(--header-h);
}

/* 회색 밴드의 윗변이 카드 이미지 하단보다 35px 위에서 시작한다.
   left/right:0 은 body 폭 기준이므로 100vw 없이 풀블리드가 된다. */
.lab__band {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: calc(var(--sec-pt) + var(--sec-title-h) + 15px + var(--lab-img-h) - 35px);
  background: var(--c-band);
  z-index: -1;
}

.lab__arrows {
  display: flex;
  align-items: center;
  gap: 24px;   /* 화살표 양옆 라인 간격 */
}

.lab__arrow {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  transition: opacity .2s var(--ease);
}

.lab__arrow svg { width: 18px; height: 18px; }

.lab__arrow[disabled] {
  opacity: .3;
  pointer-events: none;
}

/* 트랙만 오른쪽으로 흘려 마지막 카드가 화면 끝에서 잘려 보이게 한다.
   왼쪽은 컨테이너 시작선에 맞추고, 오른쪽 패딩은 주지 않는다. */
.lab__scroller {
  padding-left: max(var(--gutter), calc((100% - var(--container)) / 2));
}

.lab__track {
  display: flex;
  gap: var(--gap);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.lab__track::-webkit-scrollbar { display: none; }

.lab__track > .card {
  flex: 0 0 var(--lab-card-w);
  width: var(--lab-card-w);
  scroll-snap-align: start;
}

.lab .card__media { aspect-ratio: 16 / 10; }
.lab .card__title { font-size: var(--t-card-sm); }

/* --- WRITING ------------------------------------------------------------- */
.writing__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

.writing .card__media { aspect-ratio: 1 / 1; }

.writing .card__title {
  font-size: var(--t-card-sm);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* --- CREDENTIALS --------------------------------------------------------- */
.cred {
  background: var(--c-band);
  padding-top: clamp(56px, 7vw, 96px);
  padding-bottom: clamp(56px, 7vw, 96px);
  scroll-margin-top: var(--header-h);
}

.cred__layout {
  display: grid;
  grid-template-columns: minmax(235px, max-content) 1fr;
  gap: 65px;
}

.cred__title {
  font: 700 var(--t-sec-title) / 1 var(--font-display);
  letter-spacing: -.01em;
  text-transform: uppercase;
}

.cred__title span { display: block; }

.cred__lead {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-meta);
}

.cred__cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

/* 수상 카드는 <button> 이다. 눌러서 상장 원본을 연다.
   브라우저 기본 버튼 모양을 지우고 카드와 같은 상자로 되돌린다. */
.cred__card {
  position: relative;
  display: block;
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  text-align: left;
  font: inherit;
  color: inherit;
  aspect-ratio: 2 / 3;
  background: var(--c-ink);
  overflow: hidden;
}

button.cred__card { cursor: pointer; }

.cred__card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cred__card::after {
  content: "";
  position: absolute;
  inset: 0;
  /* 목업이 흰 문서라 스크림을 진하게 잡아야 아래 흰 글자가 읽힌다 */
  background: linear-gradient(to top, rgba(0, 0, 0, .88) 0%, rgba(0, 0, 0, .72) 30%,
                              rgba(0, 0, 0, .3) 50%, transparent 70%);
}

.cred__card-body {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 20px;
  z-index: 1;
  color: var(--c-invert);
}

.cred__card-label {
  font: 500 var(--t-label) / 1.4 var(--font-display);
  letter-spacing: .06em;
}

.cred__card-text {
  margin-top: 6px;
  font-size: var(--t-card-sm);
  font-weight: 600;
  line-height: 1.37;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 카드 hover 는 제목 밑줄만이다. 이미지 확대나 그림자를 넣지 않는다. */
button.cred__card:hover .cred__card-text,
button.cred__card:focus-visible .cred__card-text { text-decoration: underline; }

.cred__card-more {
  display: block;
  margin-top: 10px;
  font: 500 var(--t-label) / 1 var(--font-display);
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--c-invert);
  opacity: .72;
}

/* 목록 안에서 스캔본을 여는 작은 버튼 */
.cred__scan {
  margin-left: 8px;
  padding: 0;
  border: 0;
  border-bottom: 1px solid currentColor;
  background: none;
  font: inherit;
  font-size: inherit;
  color: var(--c-meta);
  cursor: pointer;
}

.cred__scan:hover,
.cred__scan:focus-visible { color: var(--c-ink); }

/* --- 상장 원본 보기 ------------------------------------------------------ */
/* display 를 지정하면 브라우저 기본 [hidden] 규칙을 이겨 버린다. 되돌려 준다. */
.lightbox[hidden] { display: none; }

.lightbox {
  position: fixed;
  inset: 0;
  /* 헤더(900)와 TOP 버튼(800) 위, 전체 메뉴 오버레이(9999) 아래 */
  z-index: 9500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(16px, 4vw, 56px);
  background: rgba(0, 0, 0, .92);
}

.lightbox__frame {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  max-width: min(100%, 960px);
  max-height: 100%;
  margin: 0;
}

.lightbox__frame img {
  min-height: 0;
  max-width: 100%;
  max-height: 72vh;
  object-fit: contain;
  background: var(--c-invert);
}

.lightbox__caption {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: baseline;
  justify-content: center;
  text-align: center;
  font-size: var(--t-meta);
  line-height: 1.5;
  color: var(--c-invert);
}

.lightbox__caption a {
  border-bottom: 1px solid currentColor;
  color: var(--c-invert);
}

.lightbox__close {
  position: absolute;
  top: clamp(12px, 3vw, 28px);
  right: clamp(12px, 3vw, 28px);
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, .4);
  background: none;
  color: var(--c-invert);
  cursor: pointer;
}

.lightbox__close svg { width: 16px; height: 16px; }

.lightbox__close:hover { border-color: var(--c-invert); }

.cred__list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px var(--gap);
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--c-line);
  font-size: var(--t-meta);
  line-height: 1.5;
}

.cred__list dt {
  display: inline;
  color: var(--c-meta);
}

.cred__list dd {
  display: inline;
  margin-left: 8px;
}

.cred__list > div { break-inside: avoid; }

/* --- CONTACT ------------------------------------------------------------- */
.contact {
  background: var(--c-ink);
  color: var(--c-invert);
  padding-top: clamp(72px, 9vw, 120px);
  padding-bottom: clamp(48px, 6vw, 72px);
  text-align: center;
  scroll-margin-top: var(--header-h);
}

.contact .logo__name { font-size: clamp(22px, 2.9vw, 41px); }   /* 헤더 로고의 약 70% */
.contact .logo__sub  { font-size: clamp(10px, 1vw, 16px); }

.contact__mail {
  display: inline-block;
  margin-top: 40px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 32px);
  font-weight: 500;
  letter-spacing: .01em;
}

.contact__actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 24px;
  font: 600 var(--t-nav) / 1 var(--font-display);
  letter-spacing: .04em;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}

.btn--solid {
  background: var(--c-invert);
  color: var(--c-ink);
}

.btn--ghost {
  border: 1px solid var(--c-invert);
  color: var(--c-invert);
}

.contact__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0;
  margin-top: 40px;
  font-size: var(--t-meta);
  letter-spacing: .02em;
}

.contact__links li + li::before {
  content: "|";
  padding: 0 14px;
  color: rgba(255, 255, 255, .4);
}

/* 링크가 없는 계정은 링크처럼 보이지 않게 둔다 (§14 — 동작하지 않는 UI 금지) */
.contact__handle {
  margin-top: 12px;
  font: 400 var(--t-meta) / 1.4 var(--font-display);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .6);
}

.contact__handle span {
  margin-left: 8px;
  font-family: var(--font-body);
  letter-spacing: 0;
  text-transform: none;
  color: var(--c-invert);
}

.contact .social {
  justify-content: center;
  margin-top: 32px;
}

.contact__copy {
  margin-top: 48px;
  font: 400 12px / 1.4 var(--font-display);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .6);
}

/* ==========================================================================
   5. 프로젝트 상세 페이지
   ========================================================================== */

.detail-hero {
  position: relative;
  margin-top: var(--header-h);
  height: clamp(360px, 52vh, 560px);
  background: #141414;
  overflow: hidden;
}

.detail-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* 위를 기준으로 잘라야 목업 창의 상단 바가 보인다 */
  object-position: center top;
}

.detail-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, .6) 0%, rgba(0, 0, 0, 0) 60%);
}

.detail-hero__copy {
  position: absolute;
  left: 50%;
  bottom: 40px;
  z-index: 1;
  width: min(100%, var(--container));
  padding-inline: var(--gutter);
  transform: translateX(-50%);
  color: var(--c-invert);
}

.detail-hero__label {
  font: 500 var(--t-label) / 1.4 var(--font-display);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.detail-hero__title {
  margin-top: 8px;
  font: 700 var(--t-sec-title) / 1.05 var(--font-display);
  letter-spacing: -.01em;
  text-transform: uppercase;
}

.detail { padding-bottom: clamp(64px, 8vw, 96px); }

.detail__read {
  width: 100%;
  max-width: calc(var(--container-rd) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.detail__overview {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 48px;
  padding-top: clamp(48px, 6vw, 80px);
}

.detail__summary {
  font-size: 18px;
  line-height: 1.8;
}

.detail__facts {
  font-size: var(--t-meta);
  line-height: 1.6;
}

.detail__facts > div {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--c-line);
}

.detail__facts > div:last-child { border-bottom: 1px solid var(--c-line); }

.detail__facts dt {
  font: 500 var(--t-label) / 1.6 var(--font-display);
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--c-meta);
}

.detail__facts a { text-decoration: underline; text-underline-offset: 3px; }

/* 저장소 링크. 옥토캣 마크를 앞에 붙여 다른 줄과 구분한다.
   밑줄은 글자에만 걸려야 해서 마크와 글자를 각각 감싼다. */
.repo-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.repo-link__mark {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
}

.repo-link span { text-decoration: underline; text-underline-offset: 3px; }

.repo-link:hover span,
.repo-link:focus-visible span { text-decoration-thickness: 2px; }

.detail__block { padding-top: clamp(40px, 5vw, 64px); }

.detail__h3 {
  margin-bottom: 14px;
  font: 700 24px / 1.2 var(--font-display);
  letter-spacing: .02em;
  text-transform: uppercase;
}

.detail__h4 {
  margin-bottom: 8px;
  font-size: var(--t-card-sm);
  font-weight: 600;
  line-height: 1.37;
}

.detail__block p {
  font-size: 17px;
  line-height: 1.8;
}

.detail__block p + p { margin-top: 14px; }

.detail__figure {
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-top: clamp(40px, 5vw, 64px);
}

.detail__figure img {
  width: 100%;
  background: var(--c-band);
}

.detail__figure figcaption {
  margin-top: 12px;
  font-size: var(--t-meta);
  color: var(--c-meta);
}

.detail__item + .detail__item { margin-top: 32px; }

.detail pre {
  margin-top: 14px;
  padding: 20px;
  background: var(--c-code-bg);
  border-left: 2px solid var(--c-ink);
  font: 13px / 1.7 var(--font-mono);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  word-break: normal;
  overflow-wrap: normal;
}

.detail__bullets {
  font-size: 17px;
  line-height: 1.8;
}

.detail__bullets li {
  position: relative;
  padding-left: 18px;
}

.detail__bullets li + li { margin-top: 10px; }

.detail__bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .8em;
  width: 6px;
  height: 1px;
  background: var(--c-ink);
}

.detail__nav {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  margin-top: clamp(48px, 6vw, 80px);
  padding: 24px var(--gutter) 0;
  border-top: 1px solid var(--c-line);
  font: 700 var(--t-label) / 1.4 var(--font-display);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.detail__nav span {
  display: block;
  margin-bottom: 4px;
  font-weight: 400;
  color: var(--c-meta);
}

.detail__nav a:last-child { text-align: right; }

/* ==========================================================================
   6. Utilities
   ========================================================================== */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ==========================================================================
   7. Hover — 터치 기기에는 적용하지 않는다
   ========================================================================== */

@media (hover: hover) {
  .card:hover .card__title,
  .card:focus-visible .card__title {
    text-decoration: underline;
    text-underline-offset: 4px;
    text-decoration-thickness: 1px;
    transition: text-decoration-color .15s var(--ease);
  }

  .section__more:hover,
  .detail__nav a:hover {
    text-decoration: underline;
    text-underline-offset: 4px;
    text-decoration-thickness: 1px;
  }

  .gnb__menu a:hover { color: var(--c-invert); }
  .gnb__links a:hover { opacity: .6; }

  .social a:hover {
    background: var(--c-invert);
    color: var(--c-ink);
  }

  .btn--solid:hover { background: rgba(255, 255, 255, .82); }

  .btn--ghost:hover {
    background: var(--c-invert);
    color: var(--c-ink);
  }

  .btn-contact:hover { background: #222222; }
}

/* ==========================================================================
   8. Media queries — 1280 → 1024 → 768 → 480
   ========================================================================== */

@media (max-width: 1279px) {
  .writing__grid { grid-template-columns: repeat(3, 1fr); }
  .detail__overview { grid-template-columns: 1fr 320px; }
}

@media (max-width: 1023px) {
  .site-header__inner {
    height: var(--header-h-sm);
    padding: 0 var(--gutter);
    justify-content: center;
  }

  .site-header__aside {
    top: 50%;
    transform: translateY(-50%);
  }

  .site-nav { display: none; }

  .work__grid { gap: 24px; }
  .writing__grid { grid-template-columns: repeat(2, 1fr); }

  .cred__layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .detail__overview {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 767px) {
  .work__grid { grid-template-columns: 1fr; }
  .writing__grid { grid-template-columns: 1fr; }

  /* 좁은 화면에서는 목업 창의 왼쪽(파일 트리·코드)이 보이도록 왼쪽을 기준으로 자른다 */
  .hero__img,
  .detail-hero img { object-position: left top; }

  .gnb__body {
    grid-template-columns: 1fr;
    gap: 40px;
    align-content: start;
  }

  .gnb__ghost { font-size: 40vh; }

  /* CREDENTIALS 카드를 가로 스크롤로 전환한다 */
  .cred__cards {
    display: flex;
    gap: var(--gap);
    overflow-x: auto;
    overscroll-behavior-x: contain;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }

  .cred__cards::-webkit-scrollbar { display: none; }

  .cred__card {
    flex: 0 0 72%;
    scroll-snap-align: start;
  }

  .cred__list { grid-template-columns: 1fr; }
}

/* 좁은 화면에서는 가운데 로고와 우측 CONTACT/햄버거가 겹친다.
   절대 배치를 풀어 두 번째 줄로 내리고 로고를 한 단계 줄인다. */
@media (max-width: 599px) {
  .site-header__inner {
    padding-top: 14px;
    padding-bottom: 14px;
    justify-content: space-between;
  }

  .site-header__aside {
    position: static;
    transform: none;
    align-self: flex-end;
  }

  .logo__name { font-size: clamp(22px, 6.4vw, 28px); }
}

@media (max-width: 479px) {
  :root { --gutter: 20px; }

  .hero__copy {
    bottom: 32px;
    text-align: left;
  }

  .contact__actions { flex-direction: column; }
  .btn { width: 100%; }

  /* 오버레이 상단 로고가 닫기 버튼에 밀려 두 줄로 접히는 것을 막는다 */
  .gnb__top .logo__name { font-size: clamp(18px, 5.4vw, 26px); }

  .lab__track > .card {
    flex-basis: 72vw;
    width: 72vw;
  }

  /* 카드 폭이 바뀌었으므로 밴드 오프셋도 같은 비율로 다시 계산한다 */
  .lab__band { top: calc(var(--sec-pt) + var(--sec-title-h) + 15px + (72vw * 10 / 16) - 35px); }

  .detail__facts > div { grid-template-columns: 80px 1fr; }
}