:root {
  --black: #050505;
  --obsidian: #111111;
  --silver: #c9c9c9;
  --chrome: #e7e7e2;
  --bronze: #8a5a37;
  --beige: #b6a38c;
  --ash: #5c5b58;
  --brown: #2a211b;
  --line: rgba(231, 231, 226, .18);
  --soft: rgba(231, 231, 226, .72);
  --serif: "Cormorant Garamond", Georgia, serif;
  --sans: "Space Grotesk", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--black); }
body {
  margin: 0;
  color: var(--chrome);
  background:
    radial-gradient(circle at 68% 18%, rgba(138, 90, 55, .18), transparent 26rem),
    radial-gradient(circle at 20% 42%, rgba(231, 231, 226, .06), transparent 22rem),
    linear-gradient(180deg, #050505 0%, #0a0908 52%, #050505 100%);
  font-family: var(--sans);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .23;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 120px 120px;
  mask-image: radial-gradient(circle at 60% 28%, black, transparent 75%);
  z-index: 1;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  height: 88px;
  display: grid;
  grid-template-columns: 120px 1fr 120px;
  align-items: center;
  padding: 0 clamp(22px, 4vw, 64px);
  border-bottom: 1px solid var(--line);
  background: rgba(5,5,5,.58);
  backdrop-filter: blur(18px);
  transition: transform .55s ease, background .35s ease;
}
.site-header.is-hidden { transform: translateY(-100%); }
.site-header.inner { position: sticky; }
.brand-mark, .brand-word { justify-self: start; }
.brand-mark {
  width: 48px;
  height: 48px;
  border: 1px solid var(--beige);
  border-radius: 50%;
  position: relative;
}
.brand-mark::before, .brand-mark::after {
  content: "";
  position: absolute;
  inset: 21px 7px auto;
  height: 1px;
  background: var(--beige);
  transform: rotate(-34deg);
}
.brand-mark::after { transform: rotate(24deg); opacity: .65; }
.brand-mark span {
  position: absolute;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--beige);
  right: 7px;
  top: 8px;
}
.brand-word {
  font-family: var(--serif);
  font-size: 22px;
  letter-spacing: .28em;
}
.primary-nav {
  display: flex;
  justify-content: center;
  gap: clamp(26px, 5vw, 78px);
  text-transform: uppercase;
  letter-spacing: .26em;
  font-size: 13px;
}
.primary-nav a, .cart-link {
  color: rgba(231,231,226,.82);
  transition: color .25s ease;
}
.primary-nav a:hover, .cart-link:hover { color: var(--beige); }
.cart-link {
  justify-self: end;
  text-transform: uppercase;
  letter-spacing: .18em;
  font-size: 12px;
}

.hero {
  min-height: 100svh;
  position: relative;
  display: grid;
  grid-template-columns: minmax(320px, 42%) minmax(0, 58%);
  align-items: center;
  padding: 116px clamp(22px, 5vw, 88px) 70px;
  isolation: isolate;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(5,5,5,.98) 0%, rgba(5,5,5,.86) 22%, rgba(5,5,5,.48) 44%, rgba(5,5,5,.1) 74%),
    radial-gradient(circle at 72% 48%, rgba(231,231,226,.1), transparent 34rem),
    radial-gradient(circle at 70% 63%, rgba(138,90,55,.2), transparent 23rem),
    linear-gradient(180deg, rgba(5,5,5,.9) 0%, transparent 20%, transparent 73%, rgba(5,5,5,.92) 100%);
}
.hero-copy {
  max-width: 560px;
  position: relative;
  z-index: 5;
  padding-top: 22px;
}
.eyebrow {
  margin: 0 0 22px;
  color: var(--beige);
  text-transform: uppercase;
  letter-spacing: .28em;
  font-size: 12px;
  font-weight: 600;
}
h1, h2, h3 { font-family: var(--serif); font-weight: 400; margin: 0; }
.hero h1 {
  font-size: clamp(96px, 11.2vw, 184px);
  line-height: .7;
  letter-spacing: .025em;
  color: rgba(241, 236, 225, .96);
  text-shadow: 0 0 40px rgba(231, 231, 226, .14), 0 28px 70px rgba(0,0,0,.52);
}
.rule-arrow {
  width: 58px;
  height: 1px;
  background: var(--beige);
  margin: 34px 0 28px;
  position: relative;
}
.rule-arrow::after {
  content: "->";
  position: absolute;
  right: -22px;
  top: -12px;
  color: var(--beige);
}
.hero-line {
  font-family: var(--serif);
  font-size: clamp(26px, 2.4vw, 42px);
  color: rgba(231,231,226,.82);
  margin: 0 0 42px;
}
.metal-button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  min-width: 260px;
  min-height: 66px;
  padding: 0 28px;
  border: 1px solid rgba(182,163,140,.86);
  color: rgba(241, 236, 225, .92);
  background: linear-gradient(90deg, rgba(182,163,140,.16), rgba(231,231,226,.035));
  text-transform: uppercase;
  letter-spacing: .22em;
  font-weight: 600;
  font-size: 13px;
  position: relative;
  overflow: hidden;
}
.metal-button::before {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-110%);
  background: linear-gradient(90deg, transparent, rgba(231,231,226,.24), transparent);
  transition: transform .7s ease;
}
.metal-button:hover::before { transform: translateX(110%); }
.metal-button.full { width: 100%; cursor: pointer; }

.hero-object {
  position: absolute;
  inset: 96px 0 0 28%;
  z-index: 0;
  min-height: 0;
  display: block;
  margin-left: 0;
  overflow: hidden;
}
.hero-object::before,
.hero-object::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
}
.hero-object::before {
  background:
    linear-gradient(90deg, rgba(5,5,5,.98) 0%, rgba(5,5,5,.76) 13%, rgba(5,5,5,.18) 33%, transparent 61%),
    linear-gradient(180deg, rgba(5,5,5,.76) 0%, transparent 18%, transparent 77%, rgba(5,5,5,.88) 100%);
}
.hero-object::after {
  inset: auto 0 0;
  height: 28%;
  background: linear-gradient(180deg, transparent, rgba(42,33,27,.24) 42%, rgba(5,5,5,.9));
}
.hero-object img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 58% 50%;
  opacity: .98;
  filter: contrast(1.08) saturate(.9) drop-shadow(0 56px 90px rgba(0,0,0,.82));
  transform: translate3d(var(--px, 0), var(--py, 0), 0) scale(1.08);
  transition: transform .25s ease-out;
}
.shine {
  position: absolute;
  inset: 14% 10%;
  z-index: 3;
  pointer-events: none;
  background: radial-gradient(circle at var(--mx, 55%) var(--my, 42%), rgba(231,231,226,.2), transparent 18%);
  mix-blend-mode: screen;
  opacity: .55;
}
.side-rail {
  position: absolute;
  left: clamp(18px, 3vw, 54px);
  bottom: 66px;
  display: flex;
  align-items: center;
  gap: 18px;
  transform: rotate(-90deg);
  transform-origin: left bottom;
  color: rgba(231,231,226,.52);
  letter-spacing: .35em;
  text-transform: uppercase;
  font-size: 11px;
}
.side-rail i {
  width: 100px;
  height: 1px;
  background: var(--beige);
}
.hero-pagination {
  position: absolute;
  right: clamp(24px, 5vw, 86px);
  bottom: 54px;
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  letter-spacing: .2em;
}
.hero-pagination b {
  display: block;
  width: 140px;
  height: 1px;
  background: linear-gradient(90deg, var(--beige) 45%, rgba(231,231,226,.16) 45%);
}

.section-pad { padding: clamp(74px, 9vw, 144px) clamp(22px, 5vw, 88px); }
.intro-grid {
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: clamp(40px, 8vw, 130px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.statement h2, .section-title h2, .page-hero h1 {
  font-size: clamp(52px, 7vw, 118px);
  line-height: .9;
  max-width: 930px;
}
.statement-small {
  align-self: end;
  max-width: 410px;
  color: var(--soft);
  line-height: 1.7;
}
.statement-small a, .section-title a, .catalog-card a { color: var(--beige); text-transform: uppercase; letter-spacing: .18em; font-size: 12px; }

.section-title {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 28px;
  margin-bottom: 42px;
}
.section-title .eyebrow { grid-column: 1 / -1; margin-bottom: -8px; }
.section-title.compact { grid-template-columns: 1fr; max-width: 760px; }

.product-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.product-card {
  min-height: 520px;
  padding: 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,.025), rgba(255,255,255,.005));
  transition: transform .35s ease, background .35s ease;
}
.product-card:hover {
  transform: translateY(-8px);
  background: linear-gradient(180deg, rgba(182,163,140,.08), rgba(255,255,255,.012));
}
.product-card img {
  width: 100%;
  aspect-ratio: 1 / 1.08;
  object-fit: cover;
  margin-bottom: 24px;
  filter: saturate(.92) contrast(1.04);
  transition: transform .45s ease, filter .45s ease;
}
.product-card:hover img { transform: scale(1.035); filter: saturate(1) contrast(1.08); }
.product-card p, .catalog-card span, .lab-card span { color: var(--beige); margin: 0 0 12px; letter-spacing: .18em; }
.product-card h3 { font-size: 29px; line-height: .95; }
.product-card span { display: block; color: rgba(231,231,226,.55); margin: 10px 0 16px; min-height: 38px; }
.product-card strong { color: var(--chrome); font-weight: 500; }

.material-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.material-card {
  min-height: 470px;
  padding: 24px;
  display: flex;
  align-items: end;
  border: 1px solid var(--line);
  background-image: linear-gradient(180deg, transparent, rgba(0,0,0,.72)), var(--img);
  background-size: cover;
  background-position: center;
  overflow: hidden;
  position: relative;
}
.material-card::after, .lab-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--mx, 50%) var(--my, 45%), rgba(231,231,226,.22), transparent 26%);
  opacity: 0;
  transition: opacity .35s ease;
  mix-blend-mode: screen;
}
.material-card:hover::after, .lab-card:hover::after { opacity: 1; }
.material-card span {
  position: relative;
  z-index: 2;
  font-family: var(--serif);
  font-size: 32px;
}

.editorial {
  display: grid;
  grid-template-columns: .74fr 1.26fr;
  gap: clamp(36px, 6vw, 90px);
  border-top: 1px solid var(--line);
}
.editorial-copy h2 { font-size: clamp(50px, 6vw, 96px); line-height: .9; }
.editorial-copy p:not(.eyebrow) { color: var(--soft); max-width: 420px; line-height: 1.8; }
.editorial-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.editorial-grid img {
  width: 100%;
  height: 360px;
  object-fit: cover;
  border: 1px solid var(--line);
}
.editorial-grid .wide {
  grid-column: 1 / -1;
  height: 460px;
}

.site-footer {
  min-height: 180px;
  padding: 44px clamp(22px, 5vw, 88px);
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 24px;
  align-items: center;
  color: rgba(231,231,226,.62);
}
.site-footer strong { font-family: var(--serif); font-size: 24px; letter-spacing: .28em; color: var(--chrome); }
.site-footer nav { display: flex; gap: 24px; text-transform: uppercase; letter-spacing: .16em; font-size: 12px; }

.page-shell { padding: 120px clamp(22px, 5vw, 88px) 80px; }
.page-hero {
  min-height: 52vh;
  display: grid;
  align-content: center;
  border-bottom: 1px solid var(--line);
  margin-bottom: 52px;
}
.page-hero.narrow { max-width: 980px; }
.page-hero p:not(.eyebrow) { max-width: 560px; color: var(--soft); line-height: 1.8; }

.collection-matrix {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 18px;
}
.catalog-card {
  grid-column: span 4;
  min-height: 620px;
  border: 1px solid var(--line);
  display: grid;
  grid-template-rows: 1fr auto;
  background: rgba(255,255,255,.025);
  overflow: hidden;
}
.catalog-card.wide { grid-column: span 8; }
.catalog-card.tall { min-height: 760px; }
.catalog-card img {
  width: 100%;
  height: 100%;
  min-height: 360px;
  object-fit: cover;
  transition: transform .5s ease;
}
.catalog-card:hover img { transform: scale(1.035); }
.catalog-card div { padding: 28px; }
.catalog-card h2 { font-size: 42px; line-height: .95; }
.catalog-card p { color: var(--soft); line-height: 1.6; }

.lab-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.lab-card {
  min-height: 560px;
  position: relative;
  border: 1px solid var(--line);
  overflow: hidden;
  display: grid;
  align-items: end;
}
.lab-card.large { grid-column: 1 / -1; min-height: 520px; }
.lab-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}
.lab-card:hover img { transform: scale(1.06); }
.lab-card div {
  position: relative;
  z-index: 2;
  padding: 28px;
  background: linear-gradient(180deg, transparent, rgba(0,0,0,.78));
}
.lab-card h2 { font-size: 46px; line-height: .95; }
.lab-card p { max-width: 460px; color: var(--soft); line-height: 1.7; }

.detail-layout {
  min-height: 100svh;
  padding: 118px clamp(22px, 5vw, 88px) 70px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, .9fr);
  gap: clamp(32px, 6vw, 86px);
  align-items: center;
}
.main-detail {
  width: 100%;
  max-height: 650px;
  object-fit: cover;
  border: 1px solid var(--line);
}
.detail-thumbs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 14px;
}
.detail-thumbs img {
  height: 220px;
  width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
}
.detail-info h1 { font-size: clamp(72px, 8vw, 124px); line-height: .82; }
.price { font-family: var(--serif); font-size: 34px; color: var(--beige); }
.detail-info > p:not(.eyebrow):not(.price) { color: var(--soft); line-height: 1.8; max-width: 560px; }
dl { margin: 34px 0; border-top: 1px solid var(--line); }
dl div {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
dt { color: var(--beige); text-transform: uppercase; letter-spacing: .16em; font-size: 12px; }
dd { margin: 0; color: rgba(231,231,226,.76); }

.archive-hero {
  min-height: 78vh;
  display: grid;
  grid-template-columns: .82fr 1.18fr;
  gap: clamp(32px, 5vw, 80px);
  align-items: center;
  border-bottom: 1px solid var(--line);
  padding-bottom: 70px;
}
.archive-hero h1 { font-size: clamp(72px, 9vw, 150px); line-height: .82; }
.archive-hero p:not(.eyebrow) { color: var(--soft); line-height: 1.8; max-width: 540px; }
.archive-hero img { width: 100%; max-height: 640px; object-fit: cover; border: 1px solid var(--line); }
.archive-notes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  margin-top: 52px;
}
.archive-notes article {
  min-height: 380px;
  background: #070707;
  padding: 34px;
}
.archive-notes span { color: var(--beige); letter-spacing: .2em; }
.archive-notes h2 { margin-top: 64px; font-size: 44px; line-height: .95; }
.archive-notes p { color: var(--soft); line-height: 1.8; }

.reveal {
  opacity: .001;
  transform: translateY(22px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1180px) {
  .site-header { grid-template-columns: 1fr auto; height: 74px; }
  .primary-nav { display: none; }
  .hero {
    grid-template-columns: 1fr;
    min-height: 760px;
    padding-top: 96px;
  }
  .hero-object {
    inset: 74px 0 0 18%;
    opacity: .92;
  }
  .hero-object img {
    object-position: 64% 48%;
    transform: translate3d(var(--px, 0), var(--py, 0), 0) scale(1.12);
  }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .product-card { min-height: auto; }
  .material-row { grid-template-columns: repeat(2, 1fr); }
  .editorial { grid-template-columns: 1fr; }
  .catalog-card, .catalog-card.wide { grid-column: span 6; }
  .detail-layout, .archive-hero { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .site-header { padding: 0 18px; }
  .brand-mark { width: 40px; height: 40px; }
  .cart-link { font-size: 11px; }
  .hero {
    min-height: 530px;
    padding: 88px 18px 50px;
  }
  .hero-copy { max-width: 100%; padding-top: 0; }
  .hero-object {
    inset: 74px 0 0 18%;
  }
  .hero h1 { font-size: clamp(66px, 22vw, 94px); }
  .hero-line { font-size: 26px; }
  .metal-button { min-width: 0; width: 100%; min-height: 66px; }
  .side-rail, .hero-pagination { display: none; }
  .intro-grid, .section-title, .site-footer { grid-template-columns: 1fr; }
  .section-pad, .page-shell, .detail-layout { padding-left: 18px; padding-right: 18px; }
  .statement h2, .section-title h2, .page-hero h1 { font-size: clamp(44px, 16vw, 76px); }
  .product-grid, .material-row, .lab-grid, .archive-notes { grid-template-columns: 1fr; }
  .material-card, .lab-card, .lab-card.large { min-height: 380px; grid-column: auto; }
  .editorial-grid { grid-template-columns: 1fr; }
  .editorial-grid .wide, .editorial-grid img { grid-column: auto; height: 300px; }
  .catalog-card, .catalog-card.wide, .catalog-card.tall { grid-column: 1 / -1; min-height: auto; }
  .catalog-card img { min-height: 300px; }
  dl div { grid-template-columns: 1fr; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}

/* ==========================================================================
   COSMIC PUZZLE INTRO STYLES
   ========================================================================== */

/* 별빛 배경 Canvas */
#space-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

/* 인트로 락 상태일 때 스크롤 잠금 및 본문 요소 은폐 */
body.intro-locked {
  overflow: hidden !important;
  height: 100vh !important;
}

/* 인트로 잠금 상태 시 보이지 않을 컴포넌트 */
body.intro-locked .site-header,
body.intro-locked .hero-copy,
body.intro-locked .side-rail,
body.intro-locked .hero-pagination,
body.intro-locked .site-footer,
body.intro-locked main > section:not(.hero) {
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
}

/* 도킹 타겟인 히어로 이미지 자체는 인트로 도중 숨겨둠 */
body.intro-locked .hero-object img,
body.intro-locked .hero-object .shine {
  opacity: 0 !important;
}


/* 3D 뷰포트 레이어 */
#intro-puzzle-viewport {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  pointer-events: none;
  overflow: hidden;
  perspective: 1500px;
  perspective-origin: 50% 50%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transition: opacity 1.8s ease;
}

#intro-puzzle-board {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  pointer-events: auto;
}

/* 인트로 조각 카드 개별 스타일 */
.intro-card {
  position: absolute;
  background-image: url('public/assets/odd-metal/hero/hero-main-metal-ring.webp');
  background-repeat: no-repeat;
  border-radius: 3px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.85);
  cursor: pointer;
  transform-style: preserve-3d;
  transition: opacity 0.8s ease, box-shadow 0.3s ease;
  user-select: none;
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.intro-card:hover {
  filter: brightness(1.15) contrast(1.05);
  z-index: 10000 !important;
}
/* 앞면 테두리만 살짝 선명하게 */
.intro-card:hover .card-face.front {
  border-color: rgba(255, 255, 255, 0.8) !important;
  box-shadow: inset 0 0 15px rgba(255, 255, 255, 0.4), 0 0 12px rgba(255, 255, 255, 0.25);
}

/* 반짝이는 특이점 카드 (메탈릭 크롬 테마) */
.intro-card.shimmer {
  z-index: 9999 !important;
  animation: shimmer-pulse 2s infinite ease-in-out;
  border: 2px solid #ffffff;
  /* 카드 자체에 고대비 금속 필터를 얹어 링의 쇠 질감을 극대화 */
  filter: contrast(1.6) brightness(1.25) grayscale(0.2);
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.9), 
              0 0 35px rgba(255, 255, 255, 0.4), 
              inset 0 0 10px rgba(255, 255, 255, 0.6);
}


/* 조립 모션 진행 시 (CSS Transition) */
.intro-card.solving {
  transition: transform 2.2s cubic-bezier(0.16, 1, 0.3, 1), 
              opacity 2s ease, 
              border-color 1.5s ease, 
              box-shadow 2s ease;
  pointer-events: none;
}

/* 퍼즐 완성 시 페이드아웃 및 완전 은폐 */
.intro-card.solved {
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none;
  transition: opacity 1.8s ease, visibility 1.8s ease;
}
.intro-card.solved .card-face {
  opacity: 0 !important;
  transition: opacity 1.8s ease;
}

/* 인트로 가이드 UI 텍스트 */
#intro-guide-ui {
  position: absolute;
  bottom: 8vh;
  z-index: 10000;
  text-align: center;
  pointer-events: none;
  font-family: var(--sans);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0 20px;
}

.intro-guide-title {
  font-size: 1.4rem;
  letter-spacing: 0.4em;
  color: var(--chrome);
  font-weight: 500;
  text-shadow: 0 0 10px rgba(255,255,255,0.1);
}

.intro-guide-desc {
  font-size: 0.9rem;
  font-weight: 300;
  color: rgba(231, 231, 226, 0.55);
  letter-spacing: 0.05em;
}

.intro-guide-desc .shimmer-text {
  color: #00f0ff;
  font-weight: 500;
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.6);
  animation: text-pulse 2s infinite ease-in-out;
}

/* 완성 후 사이트 릴리즈 페이드인 트랜지션 보완 */
.site-header,
.hero-copy,
.side-rail,
.hero-pagination {
  transition: opacity 1.8s cubic-bezier(0.16, 1, 0.3, 1), 
              transform 1.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-object img,
.hero-object .shine {
  transition: opacity 2s ease;
}

/* 애니메이션 키프레임들 */
@keyframes shimmer-pulse {
  0% {
    transform: scale3d(1, 1, 1);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.8), 0 0 20px rgba(255, 255, 255, 0.3);
  }
  50% {
    transform: scale3d(1.08, 1.08, 1.08);
    box-shadow: 0 0 25px rgba(255, 255, 255, 1.0), 0 0 45px rgba(255, 255, 255, 0.5);
  }
  100% {
    transform: scale3d(1, 1, 1);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.8), 0 0 20px rgba(255, 255, 255, 0.3);
  }
}

@keyframes shimmer-glare-effect {
  0% {
    left: -150%;
  }
  30% {
    left: 150%;
  }
  100% {
    left: 150%;
  }
}

@keyframes text-pulse {
  0%, 100% { opacity: 0.8; text-shadow: 0 0 8px rgba(0, 240, 255, 0.4); }
  50% { opacity: 1; text-shadow: 0 0 18px rgba(0, 240, 255, 0.8); }
}

main,
.site-footer {
  transition: opacity 2s ease;
}

/* 3D 유리 조각 (Glass Shard) 및 두께감 구현 스타일 */
.intro-card {
  position: absolute;
  transform-style: preserve-3d;
  background-image: none !important; /* 배경 이미지는 하위 .front에 적용하므로 차단 */
}

.card-face {
  position: absolute;
  box-sizing: border-box;
  backface-visibility: visible;
}

/* 앞면: 반지 텍스처와 반짝이는 실버 엣지 */
.card-face.front {
  width: 100%;
  height: 100%;
  background-repeat: no-repeat;
  border: 1px solid rgba(255, 255, 255, 0.45);
  box-shadow: inset 0 0 12px rgba(255, 255, 255, 0.25);
  transform: translateZ(6px); /* 12px 두께의 절반 */
}

/* 뒷면: 반투명 다크 유리 질감 */
.card-face.back {
  width: 100%;
  height: 100%;
  background: rgba(10, 10, 10, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transform: translateZ(-6px) rotateY(180deg);
}

/* 옆면 단면: 고대비 메탈릭 실버 크롬 질감 묘사 */
.card-face.left,
.card-face.right {
  width: 12px; /* 두께 depth */
  height: 100%;
  background: linear-gradient(to bottom, #666 0%, #e8e8e8 20%, #ffffff 30%, #3a3a3a 45%, #d8d8d8 65%, #ffffff 75%, #2a2a2a 90%, #888 100%);
  border: 0.5px solid rgba(255, 255, 255, 0.75);
  box-shadow: inset 0 0 3px rgba(255, 255, 255, 0.35);
  top: 0;
}
.card-face.left {
  left: -6px;
  transform: rotateY(-90deg);
}
.card-face.right {
  right: -6px;
  transform: rotateY(90deg);
}

.card-face.top,
.card-face.bottom {
  width: 100%;
  height: 12px; /* 두께 depth */
  background: linear-gradient(to right, #666 0%, #e8e8e8 20%, #ffffff 30%, #3a3a3a 45%, #d8d8d8 65%, #ffffff 75%, #2a2a2a 90%, #888 100%);
  border: 0.5px solid rgba(255, 255, 255, 0.75);
  box-shadow: inset 0 0 3px rgba(255, 255, 255, 0.35);
  left: 0;
}
.card-face.top {
  top: -6px;
  transform: rotateX(90deg);
}
.card-face.bottom {
  bottom: -6px;
  transform: rotateX(-90deg);
}