/* =====================================================================
   Anatomy Atlas — UI styles (original)
   Dark, clean, low-clutter. Three columns: tree · 3D · info.
   ===================================================================== */
:root {
  /* luminance-stacked dark surfaces */
  --bg:        #0b0e13;   /* app canvas */
  --bg-2:      #0f141b;   /* sidebar / info panel base */
  --panel:     #141922;   /* inputs, raised surfaces */
  --panel-2:   #1a2029;   /* hover / cards */
  --line:      rgba(255,255,255,0.07);   /* hairline borders */
  --line-2:    rgba(255,255,255,0.12);
  --edge:      rgba(255,255,255,0.05);    /* light top edge on floats */
  --text:      rgba(255,255,255,0.92);
  --text-dim:  rgba(255,255,255,0.60);
  --text-mute: rgba(255,255,255,0.40);
  --accent:    #3b82f6;
  --accent-2:  #5a97f7;
  --accent-muted: rgba(59,130,246,0.15);
  --radius:    10px;
  --shadow-float: 0 14px 36px -10px rgba(0,0,0,0.7), 0 2px 8px rgba(0,0,0,0.45), inset 0 1px 0 var(--edge);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  letter-spacing: -0.005em;
  color: var(--text);
  background: var(--bg);
  overflow: hidden;
}

/* ------------------------------- topbar ------------------------------- */
.topbar {
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: baseline; gap: 8px; }
.brand-mark { color: var(--accent-2); font-size: 18px; transform: translateY(2px); }
.brand-name { font-weight: 700; letter-spacing: 0.2px; font-size: 16px; }
.brand-sub { color: var(--text-mute); font-size: 12px; }
.topbar-right { display: flex; align-items: center; gap: 10px; min-width: 0; }

.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font);
  transition: background var(--ease) 140ms, border-color var(--ease) 140ms, color var(--ease) 140ms;
}
.btn:hover { background: var(--accent-2); }
.btn.ghost { background: var(--panel-2); color: var(--text-dim); border: 1px solid var(--line); }
.btn.ghost:hover { color: var(--text); border-color: #33414f; }
.btn.tiny { padding: 3px 9px; font-size: 12px; }
.file-btn { display: inline-flex; align-items: center; }
.chk { display: inline-flex; align-items: center; gap: 6px; color: var(--text-dim); font-size: 13px; cursor: pointer; }
.chk input { accent-color: var(--accent); }

/* ------------------------------- layout ------------------------------- */
.layout {
  display: grid;
  grid-template-columns: 280px 1fr 320px;
  height: calc(100vh - 52px);
}

/* ------------------------------ sidebar ------------------------------- */
.sidebar {
  background: var(--bg-2);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.search-wrap { position: relative; padding: 12px; border-bottom: 1px solid var(--line); }
#search {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  padding: 9px 30px 9px 11px;
  font-size: 13px;
  font-family: var(--font);
  outline: none;
}
#search:focus { border-color: var(--accent); }
#search::placeholder { color: var(--text-mute); }
#search-clear {
  position: absolute; right: 20px; top: 50%; transform: translateY(-50%);
  background: none; border: none; color: var(--text-mute); font-size: 18px; cursor: pointer; line-height: 1;
}

.tree { overflow-y: auto; flex: 1; padding: 6px 6px 24px; }
.tree-system { margin-bottom: 2px; }
.tree-system-head {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 8px; border-radius: 7px; cursor: pointer; user-select: none;
}
.tree-system-head:hover { background: var(--panel); }
.tree-system-name { font-weight: 600; font-size: 13px; flex: 1; }
.tree-count { color: var(--text-mute); font-size: 11px; }
.caret { color: var(--text-mute); font-size: 10px; transition: transform .15s; }
.tree-system.collapsed .caret { transform: rotate(-90deg); }
.tree-system.collapsed .tree-system-body { display: none; }
.dot { width: 9px; height: 9px; border-radius: 50%; flex: none; }

.tree-region {
  display: flex; align-items: center; gap: 7px; cursor: pointer; user-select: none;
  font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.6px;
  color: var(--text-dim); padding: 7px 10px 7px 22px; border-radius: 6px;
}
.tree-region:hover { background: var(--panel); color: var(--text); }
.tree-region .rcaret { color: var(--text-mute); font-size: 9px; transition: transform .15s; width: 8px; }
.tree-region-group.collapsed .rcaret { transform: rotate(-90deg); }
.tree-region-group.collapsed .tree-region-body { display: none; }
.tree-region-name { flex: 1; }
.tree-region-count { color: var(--text-mute); font-size: 10px; letter-spacing: 0; }
.tree-row {
  padding: 6px 10px 6px 26px; border-radius: 6px; cursor: pointer;
  font-size: 12.5px; color: var(--text-dim);
  transition: background var(--ease) 130ms, color var(--ease) 130ms;
}
.tree-row:hover { background: var(--panel); color: var(--text); }
.tree-row.active { background: rgba(47,109,242,0.16); color: var(--text); box-shadow: inset 2px 0 0 var(--accent); }

/* ------------------------------ viewport ------------------------------ */
.viewport { position: relative; background: radial-gradient(circle at 50% 38%, #16202c 0%, #0d1117 70%); overflow: hidden; }
.viewport canvas { display: block; }

.floating-label {
  position: absolute; transform: translate(-50%, -130%);
  background: rgba(13,17,23,0.85); border: 1px solid var(--accent);
  color: var(--text); padding: 3px 9px; border-radius: 14px;
  font-size: 12px; font-weight: 600; pointer-events: none; white-space: nowrap;
  backdrop-filter: blur(4px);
}
.floating-label::after {
  content: ""; position: absolute; left: 50%; bottom: -5px; transform: translateX(-50%);
  border-left: 5px solid transparent; border-right: 5px solid transparent; border-top: 5px solid var(--accent);
}

/* anatomical view cube (orientation presets), top-right of the viewport */
.view-cube {
  position: absolute; top: 14px; right: 14px; z-index: 12;
  display: flex; align-items: center; gap: 3px;
  background: rgba(15,19,26,0.82); border: 1px solid var(--line); border-radius: 11px;
  padding: 4px; box-shadow: var(--shadow-float);
  backdrop-filter: blur(16px) saturate(1.25);
}
.view-cube button {
  background: transparent; border: 1px solid transparent; border-radius: 7px;
  color: var(--text-dim); font-family: var(--font); font-size: 11px; font-weight: 600;
  letter-spacing: 0.4px; padding: 6px 8px; cursor: pointer; min-width: 34px;
  transition: background var(--ease) 140ms, color var(--ease) 140ms, border-color var(--ease) 140ms;
}
.view-cube button:hover { background: var(--panel-2); color: var(--text); }
.view-cube button:active { background: var(--accent-muted); border-color: var(--accent); color: var(--text); }
.view-cube .vc-recenter { font-size: 16px; padding: 4px 7px; color: var(--accent-2); border-right: 1px solid var(--line); border-radius: 7px 4px 4px 7px; margin-right: 2px; }

.isolate-banner {
  position: absolute; top: 14px; left: 50%; transform: translateX(-50%);
  display: flex; align-items: center; gap: 12px;
  background: rgba(47,109,242,0.16); border: 1px solid var(--accent);
  padding: 7px 8px 7px 14px; border-radius: 20px; font-size: 13px;
  backdrop-filter: blur(6px);
}

.layers-panel {
  position: absolute; left: 16px; bottom: 16px;
  background: rgba(16,20,27,0.78); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 12px 14px; min-width: 176px;
  backdrop-filter: blur(14px) saturate(1.2);
  box-shadow: var(--shadow-float);
}
.panel-title { font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.7px; color: var(--text-mute); margin-bottom: 7px; }
.layer { display: flex; align-items: center; gap: 8px; padding: 3px 0; font-size: 12.5px; color: var(--text-dim); cursor: pointer; }
.layer:hover { color: var(--text); }
.layer input { accent-color: var(--accent); pointer-events: none; } /* row label handles the toggle (one clean fire) */
.layer-name { white-space: nowrap; }
.layer-spinner { width: 11px; height: 11px; border: 2px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.7s linear infinite; margin-left: auto; }
.chk input { pointer-events: none; }

/* X-ray / ghost control */
.xray-row { display: flex; align-items: center; gap: 8px; margin-top: 9px; padding-top: 9px; border-top: 1px solid var(--line); font-size: 11.5px; color: var(--text-dim); }
.xray-row input[type="range"] { flex: 1; accent-color: var(--accent); }

/* Loading overlay */
.loading { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; background: rgba(13,17,23,0.97); backdrop-filter: blur(3px); z-index: 30; }
.loading.hidden { display: none; }
.loading .spinner { width: 38px; height: 38px; border: 3px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
.loading .loading-text { font-size: 13px; color: var(--text-dim); }
@keyframes spin { to { transform: rotate(360deg); } }

/* status text now lives muted in the top bar */
.glb-status {
  font-size: 12px; color: var(--text-mute);
  max-width: 46vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.glb-status:empty { display: none; }

/* ----------------------- consolidated control bar --------------------- */
.toolbar-bar {
  position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%);
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: center;
  max-width: calc(100% - 36px);
  background: rgba(15,19,26,0.82); border: 1px solid var(--line); border-radius: 14px;
  padding: 8px 12px; box-shadow: var(--shadow-float);
  backdrop-filter: blur(16px) saturate(1.25);
  z-index: 12;
}
.tb-group { display: flex; align-items: center; gap: 6px; }
.tb-sep { width: 1px; align-self: stretch; min-height: 22px; background: var(--line); margin: 0 2px; }
.tb-label { font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--text-mute); }
.tb-xray input[type="range"] { width: 92px; accent-color: var(--accent); }
.tb-actions .btn { padding: 6px 11px; font-size: 12.5px; }
.tb-actions .chk { margin-right: 2px; }

.layer-pill {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
  background: transparent; border: 1px solid transparent; border-radius: 999px;
  padding: 5px 11px; font-size: 12.5px; color: var(--text-mute); font-family: var(--font);
  transition: background var(--ease) 140ms, color var(--ease) 140ms, border-color var(--ease) 140ms;
}
.layer-pill:hover { color: var(--text); background: var(--panel); }
.layer-pill.on { color: var(--text); background: var(--panel-2); border-color: var(--line-2); }
.layer-pill .dot { width: 9px; height: 9px; border-radius: 50%; opacity: 0.45; }
.layer-pill.on .dot { opacity: 1; }
.lp-count { font-size: 10.5px; color: var(--text-mute); }
.layer-pill .layer-spinner { margin-left: 0; }

/* ------------------------------ info panel ---------------------------- */
.infopanel {
  background: var(--bg-2); border-left: 1px solid var(--line);
  padding: 22px 20px; overflow-y: auto;
}
.info-empty { color: var(--text-mute); font-size: 13px; }
.info-system {
  display: inline-flex; align-items: center; font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.5px; color: var(--syscol, var(--accent-2));
  padding-left: 14px; position: relative; margin-bottom: 10px;
}
.info-system::before {
  content: ""; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 9px; height: 9px; border-radius: 50%; background: var(--syscol, var(--accent));
}
.info-title { font-size: 21px; font-weight: 600; letter-spacing: -0.02em; margin: 0 0 2px; line-height: 1.22; }
.info-latin { font-style: italic; color: var(--text-dim); font-size: 13px; margin-bottom: 14px; }
.info-desc { font-size: 14px; line-height: 1.6; color: #cdd7e2; margin: 6px 0 18px; white-space: pre-line; }
.info-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.info-actions .btn { background: var(--panel-2); color: var(--text-dim); border: 1px solid var(--line); }
.info-actions .btn:hover { color: var(--text); border-color: var(--accent); }
code { background: var(--panel); padding: 1px 5px; border-radius: 4px; font-size: 12px; color: var(--accent-2); }

/* clickable breadcrumb */
.info-system .crumb { cursor: pointer; transition: color var(--ease) 130ms; }
.info-system .crumb:hover { color: var(--text); text-decoration: underline; text-underline-offset: 2px; }
.crumb-sep { margin: 0 5px; opacity: 0.6; }

/* title row + favorite star */
.info-titlerow { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.fav-btn {
  background: none; border: none; cursor: pointer; font-size: 19px; line-height: 1;
  color: var(--text-mute); padding: 2px 2px 0; transition: color var(--ease) 140ms, transform var(--ease) 140ms;
}
.fav-btn:hover { color: #f5c84b; transform: scale(1.12); }
.fav-btn.on { color: #f5c84b; }

/* see also */
.see-also { margin-top: 22px; border-top: 1px solid var(--line); padding-top: 14px; }
.see-also-head { font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.7px; color: var(--text-mute); margin-bottom: 9px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  background: var(--panel); border: 1px solid var(--line); color: var(--text-dim);
  border-radius: 999px; padding: 5px 11px; font-size: 12px; cursor: pointer; font-family: var(--font);
  transition: background var(--ease) 140ms, color var(--ease) 140ms, border-color var(--ease) 140ms;
}
.chip:hover { background: var(--accent-muted); color: var(--text); border-color: var(--accent); }

/* sidebar quick lists (Favorites / Recent) */
#quicklists { padding: 6px 6px 0; }
.ql-section { margin-bottom: 6px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.ql-head { font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--text-mute); padding: 6px 10px 4px; }
.ql-row {
  padding: 5px 10px 5px 14px; border-radius: 6px; cursor: pointer; font-size: 12.5px; color: var(--text-dim);
  transition: background var(--ease) 130ms, color var(--ease) 130ms;
}
.ql-row:hover { background: var(--panel); color: var(--text); }

/* keyboard-highlighted search row */
.tree-row.kbd { background: var(--accent-muted); color: var(--text); box-shadow: inset 2px 0 0 var(--accent); }
.tree-row .sysdot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 7px; vertical-align: middle; }

/* tree mode toggle (By system / By region) */
.tree-mode { display: flex; gap: 4px; padding: 8px 12px 4px; }
.tree-mode button {
  flex: 1; background: var(--panel); border: 1px solid var(--line); color: var(--text-dim);
  border-radius: 7px; padding: 6px 8px; font-size: 11.5px; font-weight: 500; cursor: pointer; font-family: var(--font);
  transition: background var(--ease) 140ms, color var(--ease) 140ms, border-color var(--ease) 140ms;
}
.tree-mode button:hover { color: var(--text); }
.tree-mode button.on { background: var(--accent-muted); color: var(--text); border-color: var(--accent); }

/* accessibility */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; border-radius: 4px; }
.viewport:focus-visible { outline: 2px solid var(--accent-2); outline-offset: -2px; }

/* mobile chrome (hamburger + panel close) — hidden on desktop */
.nav-toggle, .panel-close { display: none; }

/* scrollbars */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-thumb { background: #222c38; border-radius: 6px; border: 2px solid var(--bg-2); }
::-webkit-scrollbar-thumb:hover { background: #2c3848; }

/* ----------------------------- responsive ----------------------------- */
/* scrim behind mobile drawers (hidden on desktop) */
.scrim { display: none; }

@media (max-width: 820px) {
  .topbar { padding: 0 10px; height: 50px; }
  .brand-sub, .glb-status { display: none; }
  .brand-name { font-size: 15px; }
  .nav-toggle {
    display: inline-flex; align-items: center; justify-content: center;
    width: 38px; height: 38px; margin-right: 8px; font-size: 18px; cursor: pointer; flex: none;
    background: var(--panel); border: 1px solid var(--line); border-radius: 9px; color: var(--text);
  }
  .layout { display: block; position: relative; height: calc(100dvh - 50px); }
  .viewport { position: absolute; inset: 0; }
  #viewport canvas { touch-action: none; } /* let OrbitControls own touch gestures */

  /* dim backdrop when a drawer is open */
  .scrim {
    display: block; position: absolute; inset: 0; z-index: 44;
    background: rgba(0,0,0,0.5); opacity: 0; pointer-events: none; transition: opacity 280ms var(--ease);
  }
  body.nav-open .scrim, body.has-selection .scrim { opacity: 1; pointer-events: auto; }

  /* sidebar = left drawer */
  .sidebar {
    position: absolute; top: 0; left: 0; bottom: 0; width: 85%; max-width: 320px; z-index: 48;
    transform: translateX(-100%); transition: transform 300ms var(--ease); box-shadow: var(--shadow-float);
  }
  body.nav-open .sidebar { transform: none; }

  /* info = right drawer, opens on selection */
  .infopanel {
    position: absolute; top: 0; right: 0; bottom: 0; width: 92%; max-width: 380px; z-index: 49;
    border-left: 1px solid var(--line); transform: translateX(100%);
    transition: transform 300ms var(--ease); box-shadow: var(--shadow-float); padding-top: 30px;
  }
  body.has-selection .infopanel { transform: none; }
  .panel-close {
    display: inline-flex; align-items: center; justify-content: center; position: absolute; top: 10px; right: 10px;
    width: 34px; height: 34px; font-size: 22px; cursor: pointer; z-index: 2;
    background: var(--panel); border: 1px solid var(--line); border-radius: 9px; color: var(--text-dim);
  }

  /* control bar: one horizontally-scrollable row, essentials only */
  .toolbar-bar {
    left: 8px; right: 8px; bottom: 10px; transform: none; max-width: none;
    flex-wrap: nowrap; gap: 8px; padding: 7px 9px; overflow-x: auto; overflow-y: hidden;
    -webkit-overflow-scrolling: touch; scrollbar-width: none; justify-content: flex-start;
  }
  .toolbar-bar::-webkit-scrollbar { display: none; }
  .toolbar-bar .tb-sep { display: none; }
  #layers { flex-wrap: nowrap; gap: 5px; }
  .layer-pill { flex: 0 0 auto; padding: 7px 11px; }
  .tb-group { flex: 0 0 auto; }
  .tb-xray { gap: 5px; }
  .tb-xray input[type="range"] { width: 70px; }
  .tb-actions .chk span { display: none; }       /* Labels: show just the box */
  .tb-actions #btn-show-all, .tb-actions .file-btn { display: none; } /* power features off the mobile bar */
  .tb-actions .btn { padding: 7px 11px; }

  /* bigger touch targets in the tree */
  .tree-row { padding: 9px 10px 9px 24px; }
  .tree-system-head, .tree-region { padding-top: 10px; padding-bottom: 10px; }
  .ql-row { padding: 9px 10px; }
}