/* =====================================================================
   shared/site.css — 전시 페이지 공통 크롬 (갤러리 톤 통일)
   theme.css 토큰 위에서 동작. 무채색.
   · .dtg-topbar         — 글래스 상단바 (기본: 풀폭 sticky / --float: 떠있는 알약)
   · .dtg-loader         — 풀스크린 로딩 오버레이 (진행률)
   · .dtg-panel          — 글래스 컨트롤 패널
   · .dtg-credit         — 떠있는 크레딧
   ===================================================================== */

/* ---------- 상단바 ---------- */
.dtg-topbar {
  position: sticky;
  top: 0;
  z-index: 120;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px clamp(16px, 3.5vw, 34px);
  background: rgba(250, 250, 250, .72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
}
.dtg-topbar--float {
  position: fixed;
  top: calc(14px + env(safe-area-inset-top));
  left: calc(14px + env(safe-area-inset-left));
  right: calc(14px + env(safe-area-inset-right));
  border: 1px solid var(--border-soft);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
  padding: 12px clamp(16px, 3vw, 26px);
}

.dtg-brand {
  display: inline-flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--brand);
  line-height: 1.05;
}
.dtg-brand__mark {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: .8px;
  font-size: clamp(1.1rem, 2.6vw, 1.6rem);
}
.dtg-brand__sub {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: .68rem;
  letter-spacing: .3px;
  color: var(--text-mute);
  margin-top: 2px;
}

.dtg-topbar__right { display: flex; align-items: center; gap: 10px; }
.dtg-hint {
  font-size: .82rem;
  color: var(--text-dim);
  opacity: .9;
}
.dtg-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  font-weight: 700;
  font-size: .82rem;
  color: var(--brand);
  padding: .5rem 1rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--border-mid);
  background: var(--fill-soft);
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}
.dtg-back:hover { background: var(--accent); border-color: var(--accent); color: var(--accent-contrast); transform: translateY(-1px); }

@media (max-width: 640px) { .dtg-hint { display: none; } }

/* ---------- 로딩 오버레이 ---------- */
.dtg-loader {
  position: fixed;
  inset: 0;
  z-index: 4000;
  display: grid;
  place-items: center;
  background:
    radial-gradient(120% 120% at 50% 0%, #ffffff 0%, rgba(255,255,255,0) 60%),
    linear-gradient(160deg, var(--bg-2) 0%, var(--bg-1) 55%, var(--bg-0) 100%);
  transition: opacity .55s ease, visibility .55s ease;
}
.dtg-loader::before { /* 청사진 격자 */
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(18,19,22,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18,19,22,.05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(80% 80% at 50% 45%, #000 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(80% 80% at 50% 45%, #000 20%, transparent 80%);
}
.dtg-loader.is-done { opacity: 0; visibility: hidden; pointer-events: none; }

.dtg-loader__card {
  position: relative;
  width: min(86vw, 340px);
  padding: 30px 28px 26px;
  border-radius: var(--r-lg);
  background: var(--glass-solid);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-1);
  text-align: center;
}
.dtg-loader__mark {
  font-family: var(--font-display);
  font-size: 2.6rem;
  letter-spacing: 1px;
  color: var(--brand);
  line-height: 1;
  animation: dtg-pulse 1.5s ease-in-out infinite;
}
@keyframes dtg-pulse { 0%,100% { opacity: 1; transform: translateY(0); } 50% { opacity: .45; transform: translateY(-2px); } }

.dtg-loader__bar {
  position: relative;
  height: 6px;
  margin: 18px 0 10px;
  border-radius: var(--r-pill);
  background: var(--fill-mid);
  overflow: hidden;
}
.dtg-loader__bar > span {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  border-radius: var(--r-pill);
  background: var(--accent);
  transition: width .25s ease;
}
.dtg-loader__bar::after { /* 진행 중 셔머 */
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.6), transparent);
  transform: translateX(-100%);
  animation: dtg-shimmer 1.4s linear infinite;
}
@keyframes dtg-shimmer { to { transform: translateX(100%); } }

.dtg-loader__pct {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--text);
  letter-spacing: .5px;
}
.dtg-loader__label {
  margin-top: 4px;
  font-size: .8rem;
  color: var(--text-mute);
}

/* ---------- 글래스 컨트롤 패널 ---------- */
.dtg-panel {
  border-radius: var(--r-lg);
  background: var(--glass-solid);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-1);
  padding: 20px;
}
.dtg-panel__title {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: .6px;
  font-size: 1.25rem;
  color: var(--brand);
  margin: 0 0 4px;
}
.dtg-panel__hint { margin: 0 0 14px; font-size: .85rem; color: var(--text-mute); line-height: 1.5; }
.dtg-panel__group { margin-top: 14px; }
.dtg-panel__group h5 {
  margin: 0 0 8px;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-mute);
}

/* ---------- 떠있는 크레딧 ---------- */
.dtg-credit {
  position: fixed;
  bottom: calc(14px + env(safe-area-inset-bottom));
  right: calc(14px + env(safe-area-inset-right));
  z-index: 110;
  font-size: .74rem;
  color: var(--text-mute);
  text-decoration: none;
  padding: .45rem .8rem;
  border-radius: var(--r-pill);
  background: var(--glass-solid);
  border: 1px solid var(--border-soft);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: color .2s ease, border-color .2s ease;
}
.dtg-credit:hover { color: var(--brand); border-color: var(--border-mid); }