/* ═══════════════════════════════════════════════════════
   Canvas Area, Toolbar & HUD
   ═══════════════════════════════════════════════════════ */

/* ─── Canvas Layout ─────────────────────────────────── */
.canvas-wrap {
  flex: 1;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
canvas {
  width: 100%; height: 100%;
  cursor: grab;
  display: block;
}
canvas:active { cursor: grabbing; }

/* ─── Canvas Backgrounds ────────────────────────────── */
.canvas-wrap[data-bg="grid"] {
  background: var(--bg);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
    linear-gradient(180deg, rgba(255,255,255,0.014), transparent 26%, transparent 82%, rgba(255,255,255,0.012));
  background-size: 40px 40px, 40px 40px, 100% 100%;
}
.canvas-wrap[data-bg="gradient"] {
  background:
    radial-gradient(ellipse at 50% 40%, color-mix(in srgb, var(--surface2) 88%, transparent) 0%, transparent 62%),
    linear-gradient(180deg, var(--surface2) 0%, var(--bg) 82%);
}
.canvas-wrap[data-bg="plain"] {
  background:
    linear-gradient(180deg, var(--bg2) 0%, var(--bg) 100%);
}
.canvas-wrap[data-bg="dark"]  {
  background:
    radial-gradient(circle at 50% 40%, rgba(255,255,255,0.03) 0%, transparent 34%),
    #000;
}
.canvas-wrap::after{
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 50% 52%, transparent 42%, var(--scene-vignette) 100%);
  opacity: 0.88;
  z-index: 0;
}
canvas,
.empty-state,
.hud,
.canvas-info,
.toolbar,
#tooltip,
#measurePanel,
#atomListPanel,
#atomInspectorPanel,
#focusBar,
#snapshotStrip,
#trajectoryPlayer{
  position: relative;
  z-index: 1;
}

/* ─── Empty State ───────────────────────────────────── */
.empty-state {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 16px;
  pointer-events: none;
  animation: fadeIn 0.5s var(--ease-out);
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
.empty-hex {
  position: relative;
  width: 90px; height: 90px;
  display: flex; align-items: center; justify-content: center;
}
.empty-hex-ring {
  position: absolute; inset: 0;
  border: 1.5px solid var(--border);
  border-radius: 50%;
  animation: spin 14s linear infinite;
  border-top-color: var(--accent);
  opacity: 0.35;
}
.empty-hex-inner { font-size: 40px; opacity: 0.18; }
.empty-title {
  font-family: 'Playfair Display', serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: -0.3px;
}
.empty-sub {
  font-size: 11.5px;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.8;
  max-width: 380px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── HUD Chips ─────────────────────────────────────── */
.hud {
  position: absolute;
  top: 14px; right: 14px;
  display: none;
  flex-direction: column;
  gap: 6px;
  pointer-events: none;
}
.hud-chip {
  background: var(--glass-bg);
  border: 1px solid var(--border2);
  backdrop-filter: blur(var(--glass-blur));
  padding: 7px 12px;
  border-radius: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--text-dim);
  display: flex; align-items: center; gap: 6px;
  letter-spacing: 0.08em;
  box-shadow: 0 8px 14px rgba(0,0,0,0.10);
}
.hud-chip .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity:1; } 50% { opacity:0.3; } }

/* ─── Toolbar ───────────────────────────────────────── */
.toolbar {
  position: fixed;
  bottom: 14px; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 4px;
  background: var(--glass-bg);
  border: 1px solid var(--border2);
  backdrop-filter: blur(var(--glass-blur));
  padding: 6px;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  z-index: 10;
  max-width: calc(100vw - 28px);
}
.toolbar::before{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  pointer-events:none;
  background:linear-gradient(180deg, rgba(255,255,255,0.03), transparent 55%);
  opacity:0.6;
}
.toolbar .btn {
  transition: all var(--duration) var(--ease-out);
}
.toolbar .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.18);
}
.toolbar .btn:active {
  transform: translateY(0) scale(0.96);
}
.toolbar-chip{
  display:inline-flex;
  align-items:center;
  min-height:26px;
  padding:4px 9px;
  border:1px solid var(--border);
  border-radius:8px;
  background:rgba(12,18,28,0.82);
  color:var(--accent);
  font-family:'JetBrains Mono',monospace;
  font-size:9.5px;
  letter-spacing:0.04em;
  white-space:nowrap;
}

/* ─── Sidebar Toggle ────────────────────────────────── */
.sidebar-toggle {
  position: absolute;
  top: 50%; left: -1px;
  transform: translateY(-50%);
  width: 20px; height: 52px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-left: none;
  border-radius: 0 var(--radius) var(--radius) 0;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 9px;
  color: var(--text-dim);
  transition: all var(--duration) var(--ease-out);
  z-index: 5;
}
.sidebar-toggle:hover {
  background: var(--surface3);
  color: var(--accent);
  width: 24px;
}

/* ─── Tooltip ───────────────────────────────────────── */
#tooltip {
  position: fixed;
  background: var(--glass-bg);
  border: 1px solid var(--accent);
  padding: 13px 16px;
  border-radius: 12px;
  font-size: 11px;
  pointer-events: none;
  display: none;
  z-index: 200;
  box-shadow: var(--shadow-lg);
  min-width: 170px;
  backdrop-filter: blur(var(--glass-blur));
  box-shadow: 0 12px 24px rgba(0,0,0,0.16), 0 0 0 1px rgba(255,255,255,0.03) inset;
}
.tt-sym {
  font-family: 'Playfair Display', serif;
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 4px;
}
.tt-name {
  color: var(--text-dim);
  font-size: 11px;
  margin-bottom: 8px;
}
.tt-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--text-dim);
  margin-top: 3px;
}
.tt-row span:last-child { color: var(--text); }
.tt-divider { border-top: 1px solid var(--border); margin: 7px 0; }

/* ─── Canvas Info Overlay ───────────────────────────── */
.canvas-info {
  position: absolute;
  top: 14px; left: 14px;
  background: var(--glass-bg);
  border: 1px solid var(--border);
  backdrop-filter: blur(var(--glass-blur));
  border-radius: 12px;
  padding: 11px 13px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--text-dim);
  display: none;
  line-height: 1.8;
  pointer-events: none;
  box-shadow: var(--shadow-md);
  min-width: 270px;
}
.canvas-info.visible { display: block; }
.canvas-info-title{
  color: var(--text);
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 8px;
  display:flex;
  align-items:center;
  gap:8px;
}
.canvas-info-title::before{
  content:"";
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 12px var(--glow-strong);
}
.canvas-info-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:6px;
}
.canvas-info-chip{
  border:1px solid var(--border);
  border-radius:10px;
  padding:6px 8px;
  background:rgba(255,255,255,0.026);
}
.canvas-info-chip strong{
  display:block;
  color:var(--text-muted);
  font-size:8px;
  letter-spacing:.12em;
  text-transform:uppercase;
  margin-bottom:3px;
}
.canvas-info-chip span{
  color:var(--text-dim);
  font-size:10px;
}
.canvas-info-foot{
  margin-top:8px;
  padding-top:8px;
  border-top:1px solid var(--border);
  color:var(--text-dim);
  font-size:9px;
  line-height:1.6;
}

/* ─── Raw Editor Panel ──────────────────────────────── */
.editor-panel {
  width: 310px;
  background: var(--surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width var(--duration-lg) var(--ease-out);
}
.editor-panel.hidden { width: 0; overflow: hidden; }
.editor-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.editor-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  flex: 1;
}
textarea.raw-editor {
  flex: 1;
  background: var(--bg2);
  border: none;
  color: #7dd3fc;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 16px;
  resize: none;
  outline: none;
  line-height: 1.65;
}
.editor-footer {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

/* ─── PI Grade Editor Tools ─────────────────────────── */
.editor-tools {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  background: var(--surface2);
  flex-shrink: 0;
}
.editor-tools .btn { padding: 5px 8px; }
.editor-tools .btn.active-soft {
  border-color: var(--accent2);
  color: var(--accent2);
  background: rgba(124,58,237,0.08);
}
.editor-meta {
  padding: 8px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  background: var(--surface);
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--text-dim);
  flex-shrink: 0;
}
.editor-chip {
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
}
.editor-chip.dirty { border-color: var(--yellow); color: var(--yellow); }
.editor-chip.good  { border-color: var(--green);  color: var(--green); }
.editor-chip.bad   { border-color: var(--red);    color: var(--red); }

/* ─── PubChem Bar ───────────────────────────────────── */
.pubchem-bar { display: flex; gap: 6px; flex-wrap: wrap; }