:root {
  --bg: #ede7da;
  --ink: #2e241b;
  --muted: #665746;
  --card: #f8f4ea;
  --line: #c9bcaa;
  --accent: #7c2e18;
  --left: #d63a3a;
  --right: #28b7c8;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Cormorant Garamond", Georgia, serif;
  color: var(--ink);
  background: radial-gradient(circle at 20% 20%, rgba(255, 250, 242, 0.7), rgba(255, 250, 242, 0) 42%),
    linear-gradient(140deg, #e6decd, #f0eadd);
}

.viewer-topbar {
  padding: 0.9rem 1rem 0.7rem;
  border-bottom: 1px solid var(--line);
  background: rgba(252, 248, 240, 0.95);
}

.viewer-topbar-main {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
}

.viewer-topbar h1 {
  margin: 0;
  font-size: 1.55rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #6a2815;
  text-decoration: none;
  border: 1px solid rgba(122, 95, 66, 0.35);
  border-radius: 999px;
  padding: 0.38rem 0.78rem;
  background: rgba(255, 255, 255, 0.62);
  font-weight: 700;
  white-space: nowrap;
}

.back-link:hover,
.back-link:focus-visible {
  background: rgba(255, 255, 255, 0.82);
}

.viewer-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 320px);
  gap: 0.9rem;
  padding: 0.9rem;
}

.viewer-stage-wrap,
.viewer-controls {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  padding: 0.8rem;
  position: relative;
}

.viewer-viewport {
  position: relative;
  width: 100%;
  min-height: 68vh;
  border: 1px dashed rgba(110, 93, 70, 0.45);
  border-radius: 8px;
  overflow: hidden;
  touch-action: none;
  cursor: grab;
  background: linear-gradient(145deg, #f3ece0, #e6dcc8);
}

.viewer-overlay {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 0.55rem;
  text-align: center;
  padding: 1rem;
  background: rgba(246, 239, 226, 0.86);
  color: #4f3f2f;
}

.viewer-overlay.is-error {
  background: rgba(249, 233, 233, 0.92);
  color: #7a1e1e;
}

.viewer-overlay-text {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.viewer-overlay-help {
  margin: 0;
  font-size: 0.95rem;
}

.viewer-overlay-help a {
  color: var(--accent);
  font-weight: 700;
}

.viewer-spinner {
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  border: 3px solid rgba(108, 84, 56, 0.35);
  border-top-color: #7c2e18;
  animation: viewer-spin 0.75s linear infinite;
}

.viewer-viewport.dragging {
  cursor: grabbing;
}

.viewer-stage {
  --ratio: 1 / 1;
  position: absolute;
  inset: 0;
  margin: auto;
  width: min(92vw, 920px);
  max-width: 100%;
  aspect-ratio: var(--ratio);
  transform-origin: center;
}

.viewer-layer {
  position: absolute;
  inset: 0;
  border-radius: 10px;
  background-repeat: no-repeat;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.16);
}

.viewer-layer.left {
  border: 2px solid rgba(214, 58, 58, 0.75);
  background-color: rgba(214, 58, 58, 0.18);
}

.viewer-layer.right {
  border: 2px solid rgba(40, 183, 200, 0.75);
  background-color: rgba(40, 183, 200, 0.18);
}

.viewer-controls {
  display: grid;
  align-content: start;
  gap: 0.65rem;
  position: relative;
  padding-top: 3.2rem;
}

.viewer-controls label {
  font-weight: 700;
}

.control-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.45rem;
}

.control-row-flicker {
  grid-template-columns: auto minmax(0, 1fr) auto;
}

.control-row-flicker label,
.control-row-zoom label {
  margin: 0;
  white-space: nowrap;
}

.control-row-zoom {
  grid-template-columns: auto minmax(0, 1fr);
}

.control-row input[type="range"] {
  width: 100%;
}

.button-row {
  display: flex;
  gap: 0.45rem;
  margin: 0.2rem 0 0.45rem;
}

.fab-toggle {
  position: absolute;
  top: 1.2rem;
  right: 1.2rem;
  z-index: 2;
  width: clamp(2.35rem, 10vw, 4rem);
  height: clamp(2.35rem, 10vw, 4rem);
  font-size: 1.6rem;
  border: 1px solid #fff;
  min-width: 2.35rem;
  padding: 0.4rem 0;
  line-height: 1;
  border-radius: 999px;
  box-shadow: -0.2rem 0.2rem 0.5rem rgba(0, 0, 0, 0.48);
}

.fab-toggle[aria-pressed="true"] {
  background: #7f2711;
  border-color: #7f2711;
}

button {
  border: 1px solid #6c210f;
  background: linear-gradient(180deg, #8a3319, #6b210e);
  color: #fff;
  border-radius: 6px;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  font-family: inherit;
  font-weight: 700;
}

.mini-btn {
  width: 2rem;
  padding: 0.25rem 0;
}

@media (max-width: 900px) {
  .viewer-layout {
    grid-template-columns: 1fr;
  }

  .viewer-viewport {
    min-height: 56vh;
  }

  .viewer-stage {
    width: min(94vw, 680px);
  }

  .viewer-controls {
    padding-top: 0.8rem;
    padding-bottom: 3.4rem;
  }

  .fab-toggle {
    top: auto;
    right: auto;
    left: 1.2rem;
    bottom: 1.2rem;
  }
}

@media (max-width: 520px) {
  .viewer-topbar h1 {
    font-size: 1.2rem;
    line-height: 1.1;
  }
}

@keyframes viewer-spin {
  to {
    transform: rotate(360deg);
  }
}