/* 공통 스타일 — 색·간격 변수, 헤더, 푸터, 유틸리티 (모든 페이지) */

/* ==========================================================================
   디자인 변수 & 기본 초기화
   ========================================================================== */

:root {
  --bg: #fff;
  --paper: #f7f7f7;
  --ink: #080808;
  --muted: #606060;
  --line: #dedede;
  --accent: #080808;
  --dark: #050505;
  --pad: clamp(1.25rem, 4vw, 4.5rem);
  --page-gutter: max(var(--pad), calc((var(--viewport-width, 100vw) - 1120px) / 2));
  --sans: "DM Sans", "Noto Sans KR", sans-serif;
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-gentle: cubic-bezier(0.33, 1, 0.68, 1);
  --duration-fast: 0.45s;
  --duration-base: 0.7s;
  --duration-slow: 1.05s;
  --header-height: 72px;
  --header-gutter: clamp(2rem, 6vw, 6.5rem);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
}

body.menu-open {
  overflow: hidden;
}

img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

button {
  font: inherit;
}

.sr-only,
.skip-link {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link:focus {
  clip: auto;
  width: auto;
  height: auto;
  margin: 1rem;
  padding: 0.7rem 1rem;
  z-index: 200;
  background: #fff;
}

/* ==========================================================================
   공통 UI — 스크롤 진행 바, 커스텀 커서
   ========================================================================== */

.page-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 300;
  pointer-events: none;
}

.page-progress i {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
  transition: transform 0.18s var(--ease-gentle);
}

.cursor {
  position: fixed;
  z-index: 250;
  width: 18px;
  height: 18px;
  left: 0;
  top: 0;
  border-radius: 50%;
  background: #fff;
  mix-blend-mode: difference;
  pointer-events: none;
  opacity: 0;
  transform: translate3d(-50%, -50%, 0);
  transition:
    width var(--duration-fast) var(--ease-smooth),
    height var(--duration-fast) var(--ease-smooth),
    opacity 0.2s var(--ease-gentle),
    background var(--duration-fast) var(--ease-gentle);
}

html.custom-cursor,
html.custom-cursor * {
  cursor: none !important;
}

.cursor span {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 0;
  color: #000;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.cursor.active {
  width: 76px;
  height: 76px;
  mix-blend-mode: normal;
}

.cursor.active span {
  font-size: 0.58rem;
}

/* ==========================================================================
   사이트 헤더 & 내비게이션
   ========================================================================== */

.site-header {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  z-index: 100;
  height: 82px;
  padding: 0 var(--pad);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
  transition:
    background var(--duration-base) var(--ease-gentle),
    color var(--duration-base) var(--ease-gentle),
    height var(--duration-base) var(--ease-smooth),
    border-color var(--duration-base) var(--ease-gentle),
    backdrop-filter var(--duration-base) var(--ease-gentle);
}

.site-header.scrolled {
  height: 68px;
  color: var(--ink);
  background: rgba(244, 243, 239, 0.92);
  border-color: var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  width: max-content;
  line-height: 1;
}

.brand span {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.13em;
}

.brand-logo {
  display: block;
  width: 5.75rem;
  height: auto;
  object-fit: contain;
  filter: none !important;
}

.brand-logo-white {
  display: none;
}

.desktop-nav {
  display: flex;
  gap: 2.3rem;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
}

.desktop-nav a,
.header-contact {
  position: relative;
}

.desktop-nav a:after,
.header-contact:after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -5px;
  height: 1px;
  background: currentColor;
  transition: right var(--duration-base) var(--ease-smooth);
}

.desktop-nav a:hover:after,
.header-contact:hover:after {
  right: 0;
}

.header-contact {
  justify-self: end;
  font-size: 0.8rem;
}

.menu-button,
.mobile-menu {
  display: none;
}

.eyebrow {
  margin: 0 0 2rem;
  font-size: 0.65rem;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.eyebrow.light {
  color: rgba(255, 255, 255, 0.72);
}

.project-wide {
  grid-column: 1/9;
}

.project-wide figure {
  aspect-ratio: 1.42;
}

.project-tall {
  grid-column: 9/13;
  margin-top: 16vw;
}

.project-tall figure {
  aspect-ratio: 0.72;
}

.project-square {
  grid-column: 2/7;
}

.project-square figure {
  aspect-ratio: 1;
}

.project-landscape {
  grid-column: 7/13;
  margin-top: 10vw;
}

.project-landscape figure {
  aspect-ratio: 1.35;
}

.project-offset {
  grid-column: 4/11;
}

.project-offset figure {
  aspect-ratio: 1.22;
}

.project-meta {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.15rem 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
  margin-top: 0.8rem;
}

.project-meta h3 {
  margin: 0;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  font-weight: 600;
  transition:
    letter-spacing var(--duration-slow) var(--ease-smooth),
    transform var(--duration-slow) var(--ease-smooth);
}

.project-meta p {
  margin: 0;
  color: var(--muted);
  font-size: 0.7rem;
  grid-row: 2;
}

.project-meta span {
  font-size: 0.65rem;
  grid-column: 2;
  grid-row: 1/3;
}

/* ==========================================================================
   스크롤 등장 애니메이션 & 키프레임
   ========================================================================== */

.reveal {
  opacity: 0;
  transform: translate3d(0, 28px, 0);
  transition:
    opacity var(--duration-slow) var(--ease-smooth),
    transform calc(var(--duration-slow) + 0.15s) var(--ease-smooth);
}

.reveal.is-revealed {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

.about-page .reveal {
  transition: none;
}

.reveal.visible {
  pointer-events: auto;
}

/* 내부 페이지 공통 — index·project 상단 여백, 푸터 */

.inner-page {
  background: var(--bg);
}

.inner-page .site-header,
.inner-page .site-header.scrolled,
.about-page .site-header,
.about-page .site-header.scrolled {
  padding-inline: var(--page-gutter);
}

.inner-page .site-footer,
.about-page .site-footer {
  padding-inline: var(--page-gutter);
}

.inner-header {
  color: var(--ink) !important;
  background: rgba(244, 243, 239, 0.94) !important;
  border-color: var(--line) !important;
}

.desktop-nav [aria-current="page"]:after {
  right: 0;
}

.inner-footer {
  padding: 2rem var(--page-gutter);
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  align-items: end;
}

.inner-footer p {
  margin: 0;
  text-align: center;
  font-size: 0.58rem;
  color: var(--muted);
}

.inner-footer > a:last-child {
  justify-self: end;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
}

.inner-footer--compact {
  grid-template-columns: 1fr 1fr;
}

.inner-footer--compact p {
  text-align: right;
}

.site-footer {
  padding: 2rem var(--page-gutter);
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  align-items: center;
}

.site-footer p {
  margin: 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
}

.site-footer--light .brand .brand-logo-black {
  opacity: 1;
}

.site-footer--light .brand .brand-logo-white {
  opacity: 0;
}

.site-footer--dark {
  border-top-color: rgba(255, 255, 255, 0.18);
}

.site-footer--dark p {
  color: rgba(255, 255, 255, 0.45);
}

.footer-social {
  justify-self: end;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: center;
  gap: 0.85rem;
}

.footer-social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  min-height: 0;
  padding: 0;
  opacity: 0.88;
  transition: opacity var(--duration-fast) var(--ease-gentle);
}

.footer-social-link:hover,
.footer-social-link:focus-visible {
  opacity: 1;
}

.footer-social-link img {
  display: block;
  width: 1.35rem;
  height: 1.35rem;
  filter: none;
  object-fit: contain;
}

/* 가독성 & 터치·클릭 영역 크기 */

:where(a, button):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.brand small {
  font-size: 0.6rem;
}

.desktop-nav {
  font-size: 0.8rem;
}

.desktop-nav a:not(.nav-link--contact-bar),
.header-contact {
  display: flex;
  align-items: center;
  min-height: 44px;
}

.eyebrow {
  font-size: 0.72rem;
  line-height: 1.45;
}

.project-meta p {
  font-size: 0.75rem;
}

.project-meta span {
  font-size: 0.72rem;
}

.inner-footer p {
  font-size: 0.68rem;
}

.inner-footer > a:last-child {
  font-size: 0.72rem;
  display: flex;
  align-items: center;
  min-height: 44px;
}

/* 헤더 배경 */

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.94);
}

.inner-header {
  background: rgba(255, 255, 255, 0.96) !important;
}

@keyframes heroIn {
  from {
    filter: brightness(0.82);
  }
  to {
    filter: none;
  }
}

/* 한글 줄바꿈 & 제목 균형 */

:where(h1, h2, h3) {
  text-wrap: balance;
  word-break: keep-all;
  overflow-wrap: normal;
}

:where(p, li, dd) {
  word-break: keep-all;
  overflow-wrap: break-word;
  text-wrap: pretty;
}

/* 부드러운 모션 — transition 이징 */

.brand {
  position: relative;
  width: 5.75rem;
  height: 1.21rem;
  flex: none;
}

.brand .brand-logo {
  display: block !important;
  position: absolute;
  inset: 0;
  width: 100%;
  height: auto;
  opacity: 1;
  transition: opacity var(--duration-base) var(--ease-gentle);
}

.brand .brand-logo-white {
  opacity: 0;
}

.site-header.scrolled .brand-logo-black,
.site-header.inner-header .brand-logo-black {
  opacity: 1;
}

.site-header.scrolled .brand-logo-white,
.site-header.inner-header .brand-logo-white {
  opacity: 0;
}

.desktop-nav a:after,
.header-contact:after {
  transition: right var(--duration-base) var(--ease-smooth);
}

/* 헤더 높이·좌우 여백 통일 (--header-height) */

.site-header,
.site-header.scrolled {
  height: var(--header-height);
  padding-inline: var(--header-gutter);
}

.portfolio-page,
.project-detail {
  padding-top: var(--header-height);
}

.desktop-nav [aria-current]:after {
  right: 0;
}

.desktop-nav a[aria-current] {
  font-weight: 600;
}

/* UI 마무리 — 문의하기 버튼, 포커스 스타일 */

.header-contact {
  min-height: 42px;
  padding: 0 1rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
  gap: 0.25rem;
  font-size: 0.84rem;
  background: var(--ink);
  color: #fff;
  transition:
    background var(--duration-fast) var(--ease-gentle),
    color var(--duration-fast) var(--ease-gentle),
    border-color var(--duration-fast) var(--ease-gentle),
    transform var(--duration-fast) var(--ease-smooth);
}

.header-contact:after {
  display: none;
}

.header-contact:hover,
.header-contact:focus-visible {
  transform: translateY(-1px);
  background: #fff;
  color: var(--ink);
  border-color: var(--line);
}

.menu-button:focus-visible {
  outline-width: 1px;
  outline-offset: 2px;
}

/* 맨 위로 버튼 */

.scroll-top {
  --scroll-top-duration: 0.7s;
  position: fixed;
  right: var(--pad);
  bottom: clamp(1.5rem, 4vw, 2.5rem);
  z-index: 115;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: rgba(255, 255, 255, 0.94);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  box-shadow: 0 8px 24px rgba(8, 8, 8, 0.14);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(12px);
  transition:
    opacity var(--scroll-top-duration) var(--ease-gentle),
    transform var(--scroll-top-duration) var(--ease-gentle),
    visibility 0s linear var(--scroll-top-duration),
    box-shadow var(--duration-fast) var(--ease-gentle),
    background var(--duration-fast) var(--ease-gentle);
}

.scroll-top span {
  font-size: 1.05rem;
  line-height: 1;
  transform: translateY(-1px);
}

.scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
  transition:
    opacity var(--scroll-top-duration) var(--ease-gentle),
    transform var(--scroll-top-duration) var(--ease-gentle),
    visibility 0s,
    box-shadow var(--duration-fast) var(--ease-gentle),
    background var(--duration-fast) var(--ease-gentle);
}

.scroll-top.is-visible.is-fading {
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  visibility: visible;
}

.scroll-top:hover,
.scroll-top:focus-visible {
  background: #fff;
  box-shadow: 0 10px 28px rgba(8, 8, 8, 0.18);
}