:root {
  /* Rack Inspector / OpenUSD palette */
  --ri-bg: #0b0d12;
  --ri-surface: #151820;
  --ri-surface-raised: #1d212b;
  --ri-border: #2a2e3a;
  --ri-border-strong: #3c4150;
  --ri-text: #e8eaf0;
  --ri-text-dim: #8b92a8;
  --ri-text-muted: #5b6275;
  --ri-accent: #00d4aa;
  --ri-accent-hover: #00b894;
  --ri-accent-soft: rgba(0, 212, 170, 0.12);
  --ri-accent-border: rgba(0, 212, 170, 0.35);
  --ri-accent-glow: rgba(0, 212, 170, 0.35);
  --ri-shadow: 0 4px 20px rgba(0, 0, 0, 0.45);

  /* Assistant accent (neutral indigo to avoid brand confusion) */
  --assistant-accent: #6d8cff;
  --assistant-accent-hover: #5a7aef;
  --assistant-accent-soft: rgba(109, 140, 255, 0.12);
  --assistant-accent-border: rgba(109, 140, 255, 0.35);
  --assistant-accent-glow: rgba(109, 140, 255, 0.35);

  /* functional aliases */
  --green: var(--ri-accent);
  --green-dim: var(--ri-accent-hover);
  --green-glow: var(--ri-accent-glow);
  --bg: var(--ri-bg);
  --panel: var(--ri-surface);
  --panel-solid: var(--ri-surface);
  --panel-border: var(--ri-border);
  --panel-border-strong: var(--ri-border-strong);
  --text: var(--ri-text);
  --text-dim: var(--ri-text-dim);

  --radius: 4px;
  --radius-lg: 6px;
  --radius-sm: 3px;
  --shadow: var(--ri-shadow);

  font-size: 14px;
}

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

html, body {
  width: 100%; height: 100%; overflow: hidden;
  background: var(--bg); color: var(--text);
  font-family: "Inter", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#scene {
  position: fixed; inset: 0; display: block;
  background:
    radial-gradient(ellipse 140% 90% at 50% 25%, #11141b 0%, var(--ri-surface) 35%, var(--ri-bg) 70%);
}

body.photoreal #scene {
  background:
    radial-gradient(ellipse 140% 90% at 50% 25%, #14171f 0%, #0d1016 35%, var(--ri-bg) 70%);
}

body.void #scene {
  background: var(--ri-bg);
}

#header { position: fixed; top: 18px; left: 20px; display: flex; align-items: center; gap: 10px; pointer-events: none; z-index: 20; }
.brand-square {
  width: 10px; height: 10px;
  background: var(--ri-accent);
  border-radius: 2px;
  box-shadow: 0 0 10px var(--ri-accent-glow);
  flex-shrink: 0;
}
#project-title {
  font-family: "JetBrains Mono", "Inter", monospace;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ri-text);
}
#level-subtitle {
  color: var(--ri-text-dim);
  font-size: 0.8rem;
  margin-top: 2px;
}

#top-controls {
  position: fixed; top: 14px; right: 18px; z-index: 30;
  display: flex; gap: 10px; align-items: center;
  pointer-events: none;
}
#top-controls > * { pointer-events: auto; }
#stage-path {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  color: var(--ri-accent);
  background: var(--ri-surface);
  border: 1px solid var(--ri-border);
  border-radius: var(--radius);
  padding: 6px 10px;
  box-shadow: var(--ri-shadow);
}
#controls-menu-toggle {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--ri-surface);
  color: var(--ri-text);
  border: 1px solid var(--ri-border);
  border-radius: var(--radius);
  padding: 6px 12px;
  font-size: 0.8rem;
  font-family: "Inter", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  font-weight: 500;
  cursor: pointer;
  box-shadow: var(--ri-shadow);
  transition: border-color 0.15s, background 0.15s;
}
#controls-menu-toggle:hover,
#controls-menu-toggle[aria-expanded="true"] {
  border-color: var(--ri-accent-border);
  background: var(--ri-surface-raised);
}
.controls-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 240px;
  background: var(--ri-surface);
  border: 1px solid var(--ri-border);
  border-radius: var(--radius-lg);
  padding: 10px;
  box-shadow: var(--ri-shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.controls-menu[hidden] { display: none; }
.control-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.control-row label,
.control-row > span {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ri-text-dim);
  font-family: "JetBrains Mono", monospace;
}
#top-controls select,
#top-controls button,
#top-controls .segmented button {
  background: var(--ri-surface-raised);
  color: var(--ri-text);
  border: 1px solid var(--ri-border);
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 0.8rem;
  cursor: pointer;
  white-space: nowrap;
  font-family: inherit;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
  text-align: left;
}
#top-controls select:hover,
#top-controls button:hover,
#top-controls .segmented button:hover {
  border-color: var(--ri-border-strong);
  background: #252a36;
}
#top-controls button[aria-pressed="true"],
#top-controls .segmented button[aria-pressed="true"] {
  background: var(--ri-accent-soft);
  color: var(--ri-accent);
  border-color: var(--ri-accent-border);
  box-shadow: 0 0 10px var(--ri-accent-glow);
}
#top-controls button:active,
#top-controls .segmented button:active { transform: translateY(1px); }

.segmented {
  display: flex;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--ri-border);
  background: var(--ri-surface-raised);
}
.segmented button {
  flex: 1;
  border: none !important;
  border-radius: 0 !important;
  background: transparent !important;
  box-shadow: none !important;
  text-align: center;
}
.segmented button[aria-pressed="true"] {
  background: var(--ri-accent-soft) !important;
  color: var(--ri-accent) !important;
  box-shadow: 0 0 10px var(--ri-accent-glow) !important;
}

#breadcrumb { position: fixed; top: 58px; left: 20px; z-index: 20; display: flex; gap: 6px; align-items: center; }

#arch-switcher {
  display: flex; gap: 6px;
  background: var(--ri-surface);
  border: 1px solid var(--ri-border);
  border-radius: var(--radius);
  padding: 4px;
  box-shadow: var(--ri-shadow);
}
#arch-switcher button {
  background: transparent;
  color: var(--ri-text-dim);
  border: none;
  border-radius: var(--radius-sm);
  padding: 5px 10px;
  font-size: 0.75rem;
  font-family: "JetBrains Mono", monospace;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}
#arch-switcher button:hover { color: var(--ri-text); background: rgba(255,255,255,0.04); }
#arch-switcher button[aria-pressed="true"] {
  background: var(--ri-accent-soft);
  color: var(--ri-accent);
  box-shadow: 0 0 8px var(--ri-accent-glow);
}
#breadcrumb button {
  background: var(--ri-surface); color: var(--ri-text-dim); border: 1px solid var(--ri-border);
  border-radius: 999px; cursor: pointer; font-size: 0.75rem; padding: 4px 10px;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
#breadcrumb button.active { color: var(--ri-text); font-weight: 600; cursor: default; border-color: var(--ri-accent); background: var(--ri-accent-soft); }
#breadcrumb button:not(.active):hover { color: var(--ri-accent); border-color: var(--ri-accent-border); }
#breadcrumb button:disabled { opacity: 0.6; cursor: not-allowed; }
#breadcrumb .crumb-sep { color: var(--ri-text-dim); font-size: 0.7rem; }

#info-panel {
  position: fixed; top: 90px; right: 20px; left: auto; width: 300px; max-height: calc(100vh - 180px);
  background: var(--ri-surface); border: 1px solid var(--ri-border); border-radius: var(--radius-lg);
  padding: 0; z-index: 12; overflow-y: auto;
  box-shadow: var(--ri-shadow);
  transform: translateX(0); transition: opacity 0.2s, transform 0.2s;
}
#info-panel.hidden { opacity: 0; pointer-events: none; transform: translateX(16px); }
#info-name { cursor: move; }
#info-name::before {
  content: "⋮⋮";
  display: inline-block;
  margin-right: 8px;
  color: var(--ri-text-muted);
  font-size: 0.7rem;
  letter-spacing: -1px;
}
#info-close { position: absolute; top: 10px; right: 12px; background: transparent; border: none; color: var(--ri-text-dim); font-size: 1.3rem; cursor: pointer; line-height: 1; border-radius: 4px; }
#info-close:hover { color: var(--ri-text); }
#info-tag { display: inline-block; background: var(--ri-accent-soft); color: var(--ri-accent); border: 1px solid var(--ri-accent-border); font-family: "JetBrains Mono", monospace; font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.08em; padding: 2px 6px; border-radius: 3px; margin: 16px 16px 8px; }
#info-name { font-family: "JetBrains Mono", "Inter", monospace; font-size: 1.1rem; margin: 0 16px 10px; font-weight: 600; }
#info-blurb { color: var(--ri-text-dim); font-size: 0.85rem; line-height: 1.55; margin: 0 16px 16px; }
#info-specs { width: calc(100% - 32px); margin: 0 16px 16px; border-collapse: collapse; font-size: 0.8rem; }
#info-specs td { padding: 5px 0; border-bottom: 1px solid var(--ri-border); }
#info-specs td:first-child { color: var(--ri-text-dim); width: 45%; font-family: "JetBrains Mono", monospace; }
#info-specs tr:last-child td { border-bottom: none; }
#info-drill { margin: 0 16px 16px; background: var(--ri-accent); color: var(--ri-bg); border: none; border-radius: var(--radius); padding: 8px 14px; cursor: pointer; font-weight: 600; font-family: inherit; }
#info-drill:hover { filter: brightness(1.1); }
#info-drill.hidden { display: none; }

.info-section { border-top: 1px solid var(--ri-border); }
.info-section-toggle {
  width: 100%; background: transparent; border: none; color: var(--ri-text);
  font-family: "JetBrains Mono", monospace; font-size: 0.75rem;
  text-transform: uppercase; letter-spacing: 0.05em;
  padding: 10px 16px; text-align: left; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
}
.info-section-toggle:hover { background: rgba(255,255,255,0.03); }
.info-section-toggle::after { content: "−"; color: var(--ri-text-dim); }
.info-section.collapsed .info-section-toggle::after { content: "+"; }
.info-section-body { padding: 0 16px 14px; }
.info-section.collapsed .info-section-body { display: none; }
.info-section-body ul { list-style: none; padding: 0; margin: 0; font-size: 0.8rem; color: var(--ri-text-dim); line-height: 1.6; }
.info-section-body li { padding: 3px 0; border-bottom: 1px solid var(--ri-border); }
.info-section-body li:last-child { border-bottom: none; }
.info-section-body a { color: var(--ri-accent); text-decoration: none; }
.info-section-body a:hover { text-decoration: underline; }

#tooltip {
  position: fixed; pointer-events: none; background: var(--ri-surface); color: var(--ri-text);
  border: 1px solid var(--ri-border); border-radius: var(--radius); padding: 6px 10px; font-size: 0.8rem; z-index: 20;
  box-shadow: var(--ri-shadow);
}
#tooltip.hidden { display: none; }

.floating-tour-btn {
  position: fixed;
  top: 14px;
  right: 130px;
  z-index: 30;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--ri-surface);
  color: var(--ri-text);
  border: 1px solid var(--ri-border);
  border-radius: var(--radius);
  padding: 6px 12px;
  font-size: 0.8rem;
  font-family: "Inter", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: var(--ri-shadow);
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s, transform 0.15s;
}
.floating-tour-btn:hover,
.floating-tour-btn:focus-visible {
  border-color: var(--ri-accent-border);
  background: var(--ri-surface-raised);
}
.floating-tour-btn:focus-visible {
  outline: 2px solid var(--ri-accent);
  outline-offset: 2px;
}
.floating-tour-btn.hidden { display: none; }
#tour-bar { position: fixed; bottom: 62px; left: 50%; transform: translateX(-50%); z-index: 20; background: var(--ri-surface); border: 1px solid var(--ri-border); border-radius: var(--radius-lg); padding: 12px 16px; display: flex; align-items: center; gap: 14px; min-width: 380px; box-shadow: var(--ri-shadow); }
#tour-bar.hidden { display: none; }
.tour-body { flex: 1; }
#tour-step { color: var(--ri-accent); font-family: "JetBrains Mono", monospace; font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }
#tour-text { margin-top: 4px; font-size: 0.85rem; color: var(--ri-text); }
.tour-nav { background: transparent; color: var(--ri-text); border: 1px solid var(--ri-border); border-radius: var(--radius); padding: 6px 12px; cursor: pointer; font-family: inherit; font-size: 0.8rem; transition: border-color 0.15s, background 0.15s; }
.tour-nav:hover { border-color: var(--ri-border-strong); background: #252a36; }
#tour-prev:disabled { opacity: 0.4; cursor: not-allowed; }
.tour-nav.primary { background: var(--ri-accent); color: var(--ri-bg); border-color: var(--ri-accent); font-weight: 600; }
#tour-exit { background: transparent; border: none; color: var(--ri-text-dim); font-size: 1.2rem; cursor: pointer; line-height: 1; border-radius: 4px; }
#tour-exit:hover { color: var(--ri-text); background: rgba(255,255,255,0.06); }

#hint {
  position: fixed;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--ri-surface);
  border: 1px solid var(--ri-border);
  border-radius: var(--radius-lg);
  padding: 8px 14px;
  box-shadow: var(--ri-shadow);
  font-size: 0.72rem;
  color: var(--ri-text-dim);
}
.hint-group { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.hint-item { display: inline-flex; align-items: center; gap: 4px; }
#hint kbd {
  color: var(--ri-text);
  font-weight: 500;
  font-family: "JetBrains Mono", monospace;
  background: var(--ri-surface-raised);
  border: 1px solid var(--ri-border-strong);
  border-radius: var(--radius-sm);
  padding: 1px 5px;
  font-size: 0.65rem;
}
.hint-legal {
  color: var(--ri-text-muted);
  font-size: 0.65rem;
  max-width: 240px;
  text-align: right;
  line-height: 1.3;
  border-left: 1px solid var(--ri-border);
  padding-left: 14px;
}

#fade {
  position: fixed; inset: 0; z-index: 15;
  background: var(--bg);
  opacity: 0; pointer-events: none;
  transition: opacity 0.28s ease;
}
#fade.on { opacity: 1; pointer-events: auto; }

.status-message {
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  z-index: 40;
  background: var(--ri-surface);
  border: 1px solid var(--ri-accent-border);
  border-radius: var(--radius-lg);
  padding: 16px 22px;
  color: var(--ri-text);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  box-shadow: var(--ri-shadow);
  opacity: 0; pointer-events: none;
  transition: opacity 0.2s;
  max-width: 420px;
  text-align: center;
}
.status-message.visible { opacity: 1; pointer-events: auto; }
.status-message.error { border-color: #ff6b6b; color: #ff9f9f; }
.status-message.success { border-color: var(--ri-accent-border); color: var(--ri-accent); }

.intro-overlay {
  position: fixed; inset: 0; z-index: 50;
  background: rgba(11, 13, 18, 0.82);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity 0.25s ease;
  backdrop-filter: blur(6px);
}
.intro-overlay.open { opacity: 1; pointer-events: auto; }
.intro-overlay[hidden] { display: none; }
.intro-card {
  background: var(--ri-surface);
  border: 1px solid var(--ri-border);
  border-radius: var(--radius-lg);
  width: min(560px, calc(100vw - 40px));
  max-height: calc(100vh - 60px);
  overflow-y: auto;
  padding: 24px;
  box-shadow: var(--ri-shadow);
  position: relative;
}
.intro-close {
  position: absolute; top: 14px; right: 14px;
  background: transparent; border: none; color: var(--ri-text-dim);
  font-size: 1.5rem; cursor: pointer; line-height: 1; border-radius: 4px;
}
.intro-close:hover { color: var(--ri-text); }
.intro-card h2 {
  font-family: "JetBrains Mono", monospace; font-size: 1.4rem; margin: 0 0 6px;
}
.intro-subtitle { color: var(--ri-text-dim); font-size: 0.9rem; margin: 0 0 20px; }
.intro-section { margin-bottom: 20px; }
.intro-section h3 {
  font-family: "JetBrains Mono", monospace; font-size: 0.8rem;
  text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--ri-accent); margin: 0 0 8px;
}
.intro-section p { color: var(--ri-text-dim); font-size: 0.85rem; line-height: 1.55; margin: 0; }
.intro-products { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.product-card {
  position: relative;
  background: var(--ri-surface-raised);
  border: 1px solid var(--ri-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.15s, box-shadow 0.15s;
  display: flex; flex-direction: column;
  gap: 8px;
  overflow: hidden;
}
.product-card::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--ri-accent);
  opacity: 0;
  transition: opacity 0.15s;
}
.product-card:hover {
  border-color: var(--ri-accent-border);
  background: #252a36;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}
.product-card:hover::before { opacity: 1; }
.product-badge {
  align-self: flex-start;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ri-accent);
  background: var(--ri-accent-soft);
  border: 1px solid var(--ri-accent-border);
  border-radius: 999px;
  padding: 3px 8px;
}
.product-name { font-family: "JetBrains Mono", monospace; font-size: 0.9rem; font-weight: 600; color: var(--ri-text); }
.product-desc { font-size: 0.78rem; color: var(--ri-text-dim); line-height: 1.45; flex: 1; }
.product-action { font-size: 0.75rem; color: var(--ri-accent); font-weight: 600; margin-top: 6px; }
.intro-remember {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.8rem; color: var(--ri-text-dim); cursor: pointer;
}
.intro-remember input { accent-color: var(--ri-accent); }
@media (max-width: 720px) {
  .intro-products { grid-template-columns: 1fr; }
}

body.photoreal #top-controls,
body.photoreal #breadcrumb button,
body.photoreal #info-panel,
body.photoreal #tour-bar {
  background: rgba(21, 24, 32, 0.92);
}

.chat-widget {
  position: fixed;
  bottom: 22px;
  right: 26px;
  z-index: 30;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
}
.chat-toggle {
  height: 36px;
  border-radius: var(--radius);
  border: 1px solid var(--assistant-accent-border);
  background: var(--assistant-accent);
  color: var(--ri-bg);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 14px 0 12px;
  box-shadow: 0 0 16px var(--assistant-accent-glow);
  transition: transform 0.15s, background 0.15s, box-shadow 0.15s;
  font-family: "Inter", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
}
.chat-toggle:hover { transform: translateY(-1px); background: var(--assistant-accent-hover); }
.chat-toggle:focus-visible { outline: 2px solid var(--assistant-accent); outline-offset: 3px; }
.chat-toggle-icon { transition: transform 0.2s; flex-shrink: 0; }
.chat-toggle-label { white-space: nowrap; }
.chat-toggle[aria-expanded="true"] .chat-toggle-icon { transform: rotate(90deg); }

.chat-panel {
  position: absolute;
  bottom: calc(100% + 12px);
  right: 0;
  width: 340px;
  max-height: min(520px, calc(100vh - 130px));
  display: flex;
  flex-direction: column;
  background: var(--ri-surface);
  border: 1px solid var(--ri-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--ri-shadow);
  overflow: hidden;
  opacity: 0;
  transform: translateY(12px) scale(0.96);
  transform-origin: bottom right;
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
}
.chat-panel.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}
.chat-panel[hidden] { display: none; }

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  background: var(--ri-surface-raised);
  border-bottom: 1px solid var(--ri-border);
}
.chat-header-meta {
  display: flex;
  align-items: center;
  gap: 10px;
}
.chat-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius);
  background: var(--assistant-accent-soft);
  color: var(--assistant-accent);
  border: 1px solid var(--assistant-accent-border);
}
.chat-title {
  font-family: "JetBrains Mono", "Inter", monospace;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ri-text);
}
.chat-status {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.7rem;
  color: var(--ri-text-muted);
}
.chat-status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--assistant-accent);
}
.chat-close {
  background: transparent;
  border: none;
  color: var(--ri-text-dim);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s, background 0.15s;
}
.chat-close:hover,
.chat-close:focus-visible {
  color: var(--ri-text);
  background: rgba(255, 255, 255, 0.06);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  scroll-behavior: smooth;
}
.chat-messages::-webkit-scrollbar { width: 6px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb { background: var(--ri-border); border-radius: 3px; }

.chat-message {
  max-width: 90%;
  padding: 8px 12px;
  border-radius: var(--radius);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--ri-text);
  word-wrap: break-word;
}
.chat-message.user {
  align-self: flex-end;
  background: var(--ri-surface-raised);
  border: 1px solid var(--ri-border-strong);
}
.chat-message.bot {
  align-self: flex-start;
  background: var(--assistant-accent-soft);
  border-left: 3px solid var(--assistant-accent);
}
.chat-message.bot a {
  color: var(--assistant-accent);
  text-decoration: underline;
}

.chat-form {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: var(--ri-surface-raised);
  border-top: 1px solid var(--ri-border);
}
.chat-input {
  flex: 1;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--ri-border);
  border-radius: var(--radius);
  padding: 8px 10px;
  color: var(--ri-text);
  font-family: inherit;
  font-size: 0.8rem;
  outline: none;
}
.chat-input::placeholder { color: var(--ri-text-muted); }
.chat-input:focus {
  border-color: var(--assistant-accent-border);
  box-shadow: 0 0 0 2px var(--assistant-accent-soft);
}
.chat-send {
  width: 32px;
  height: 32px;
  border-radius: var(--radius);
  border: none;
  background: var(--assistant-accent);
  color: var(--ri-bg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, transform 0.15s;
  flex-shrink: 0;
}
.chat-send:hover { background: var(--assistant-accent-hover); transform: scale(1.05); }
.chat-send:focus-visible { outline: 2px solid var(--assistant-accent); outline-offset: 2px; }
.chat-send:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

@media (max-width: 720px) {
  #header { top: 14px; left: 14px; }
  #project-title { font-size: 1rem; }
  #top-controls { top: 14px; right: 14px; max-width: 180px; gap: 6px; }
  #top-controls select, #top-controls button, #top-controls .segmented button { padding: 5px 7px; font-size: 0.7rem; }
  #stage-path { display: none; }
  #breadcrumb { top: 54px; left: 14px; }
  #info-panel { right: 14px; width: calc(100% - 28px); top: 92px; max-height: calc(100vh - 120px); border-radius: var(--radius); }
  #tour-bar { min-width: auto; width: calc(100% - 28px); bottom: 60px; padding: 12px 14px; border-radius: var(--radius); }
  #hint { display: none; }
  .hint-legal { display: none; }
  .hint-group { display: none; }
  .chat-widget { bottom: 14px; right: 14px; }
  .chat-panel { width: calc(100vw - 28px); right: 0; max-height: calc(100vh - 100px); }
  .floating-tour-btn {
    top: auto;
    right: 14px;
    bottom: 62px;
    padding: 7px 12px;
    font-size: 0.75rem;
  }
  .floating-tour-btn span { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}