:root {
  --bg: #02040c;
  --surface: rgba(10, 18, 40, 0.88);
  --border: rgba(120, 190, 255, 0.35);
  --text: #e8f1ff;
  --text-dim: #8ea6c8;
  --accent: #7fd6ff;
  --header-shadow: 0 0 12px rgba(0, 0, 0, 0.8);
  --tooltip-glow: 0 0 24px rgba(80, 160, 255, 0.25);
  --panel-glow: 0 0 40px rgba(80, 160, 255, 0.25);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}

#scene {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  cursor: default;
  touch-action: none;
}
#scene.is-hovering { cursor: pointer; }

.header {
  position: fixed;
  top: 0; left: 0;
  padding: 24px 32px;
  pointer-events: none;
  text-shadow: var(--header-shadow);
}
.header__title {
  margin: 0 0 4px;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.header__subtitle { margin: 0; color: var(--text-dim); font-size: 0.9rem; }

/* viewer-facing photo/color switch — only shown when the skin opts in
   (nodes.imageToggle) and at least one node actually has an image */
.image-toggle {
  position: fixed;
  top: 24px;
  right: 32px;
  padding: 8px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  backdrop-filter: blur(8px);
  z-index: 7;
}
.image-toggle:hover { border-color: var(--accent); color: var(--accent); }
.image-toggle[hidden] { display: none; }

.legend {
  position: fixed;
  left: 32px; bottom: 24px;
  display: flex; gap: 16px; flex-wrap: wrap;
  padding: 8px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--text-dim);
}
.legend[hidden] { display: none; }
.legend__item { display: inline-flex; align-items: center; gap: 6px; }
.legend__swatch { width: 10px; height: 10px; border-radius: 50%; box-shadow: 0 0 8px currentColor; }

/* hover preview */
.tooltip {
  position: fixed;
  top: 0; left: 0;
  width: 220px;
  padding: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--tooltip-glow);
  pointer-events: none;
  z-index: 5;
}
.tooltip[hidden] { display: none; }
.tooltip__image {
  height: 110px;
  margin-bottom: 8px;
  border-radius: 4px;
  background-size: cover;
  background-position: center;
}
.tooltip__image[hidden] { display: none; }
.tooltip__date { font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }
.tooltip__title { font-size: 0.95rem; font-weight: 600; margin-top: 2px; }

/* click detail panel */
.panel {
  position: fixed;
  top: 50%; right: 32px;
  width: 360px;
  max-width: calc(100vw - 32px);
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  transform: translateY(-50%);
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--panel-glow);
  backdrop-filter: blur(8px);
  animation: panel-in 0.2s ease;
  z-index: 6;
}
.panel[hidden] { display: none; }
@keyframes panel-in {
  from { opacity: 0; transform: translate(16px, -50%); }
  to { opacity: 1; transform: translate(0, -50%); }
}
.panel__close {
  position: absolute; top: 10px; right: 12px;
  background: none; border: 0; color: var(--text-dim);
  font-size: 1.6rem; line-height: 1; cursor: pointer;
}
.panel__close:hover { color: var(--text); }
.panel__image-wrap { margin: -8px -8px 16px; border-radius: 8px; overflow: hidden; }
.panel__image-wrap[hidden] { display: none; }
.panel__image { display: block; width: 100%; height: auto; }
.panel__date { font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }
.panel__title { margin: 4px 0 10px; font-size: 1.3rem; }
.panel__category { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; font-size: 0.85rem; color: var(--text-dim); }
.panel__category[hidden] { display: none; }
.panel__category-swatch { width: 10px; height: 10px; border-radius: 50%; }
.panel__tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.panel__tag { padding: 2px 10px; border: 1px solid var(--border); border-radius: 999px; font-size: 0.75rem; color: var(--text-dim); }
.panel__description { margin: 0 0 16px; line-height: 1.55; font-size: 0.92rem; }
.panel__link { color: var(--accent); text-decoration: none; font-size: 0.9rem; }
.panel__link:hover { text-decoration: underline; }

.error { position: fixed; inset: auto 0 50% 0; text-align: center; color: var(--text-dim); }
.error[hidden] { display: none; }

@media (max-width: 640px) {
  .header { padding: 16px; }
  .image-toggle { top: 16px; right: 16px; padding: 6px 12px; font-size: 0.75rem; }
  .legend { left: 16px; bottom: 16px; }
  .panel { top: auto; bottom: 16px; right: 16px; left: 16px; width: auto; transform: none; animation: none; }
}