:root {
  --bg: #ebecee;
  --frame: #ffffff;
  --ink: #111111;
  --ink-soft: rgba(17, 17, 17, 0.55);
  --line: rgba(17, 17, 17, 0.15);
  --logo: #551622;
  --pad: clamp(16px, 2.8vw, 32px);
  --ease: cubic-bezier(0.65, 0.05, 0.2, 1);
  --font: "DM Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

button {
  color: inherit;
  background: none;
  border: 0;
  font: inherit;
  cursor: pointer;
}

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

.frame {
  position: relative;
  width: 100%;
  height: 100%;
  padding: var(--pad);
  background: var(--bg);
}

.chrome {
  position: absolute;
  z-index: 30;
  color: var(--ink);
}

.chrome--top {
  top: calc(var(--pad) * 0.28);
  left: var(--pad);
  right: var(--pad);
  height: 32px;
  display: grid;
  grid-template-columns: 40px 1fr 40px;
  align-items: center;
  pointer-events: none;
}

.chrome--top > * {
  pointer-events: auto;
}

.chrome--top .logo {
  justify-self: center;
  width: 28px;
  height: 28px;
  object-fit: contain;
}

.chrome--top .detail-btn {
  justify-self: end;
}

.chrome--left {
  left: calc(var(--pad) * 0.22);
  top: 50%;
  transform: translateY(-50%);
}

.chrome--right {
  right: calc(var(--pad) * 0.22);
  top: 50%;
  transform: translateY(-50%);
}

.chrome--meta {
  right: calc(var(--pad) * 0.18);
  bottom: calc(var(--pad) * 0.5);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  writing-mode: vertical-rl;
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  pointer-events: none;
}

.side-title {
  color: var(--ink);
  max-height: 45vh;
  overflow: hidden;
}

.icon-btn,
.nav-arrow {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  opacity: 0.7;
  transition: opacity 0.2s, background 0.2s;
}

.icon-btn:hover,
.nav-arrow:hover {
  opacity: 1;
}

.detail-btn.is-open {
  opacity: 1;
  background: rgba(17, 17, 17, 0.06);
}

.stage {
  position: absolute;
  inset: var(--pad);
  background: var(--frame);
  overflow: hidden;
  border: 1px solid var(--line);
}

.gallery-mask {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.gallery-track {
  display: flex;
  height: 100%;
  width: 100%;
  transition: transform 0.75s var(--ease);
  will-change: transform;
}

.slide {
  flex: 0 0 100%;
  height: 100%;
  position: relative;
  background: #d8dae0;
}

.slide img {
  transform: scale(1.03);
  transition: transform 1s var(--ease), opacity 0.4s ease;
  opacity: 0.96;
}

.slide.is-active img {
  transform: scale(1);
  opacity: 1;
}

.slide__empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 8px;
  color: var(--ink-soft);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: center;
  padding: 24px;
}

/* Detail panel: extends left from top-right */
.detail-panel {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 10;
  width: min(360px, 42vw);
  max-width: 100%;
  min-height: 140px;
  padding: 28px 28px 32px;
  background: rgba(255, 255, 255, 0.94);
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transform: translateX(100%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.45s var(--ease), opacity 0.35s ease;
  backdrop-filter: blur(8px);
}

.detail-panel.is-open {
  transform: translateX(0);
  opacity: 1;
  pointer-events: auto;
}

.detail-panel__album {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.detail-panel__caption {
  font-size: clamp(15px, 1.6vw, 18px);
  font-weight: 300;
  line-height: 1.55;
  letter-spacing: 0.01em;
  white-space: pre-wrap;
}

.detail-panel__caption:empty::before {
  content: "No caption.";
  color: var(--ink-soft);
  font-style: italic;
}

@media (max-width: 720px) {
  :root {
    --pad: 12px;
  }

  .detail-panel {
    width: min(100%, 320px);
    padding: 22px;
  }

  .chrome--meta {
    font-size: 9px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}