/* ─────────────────────────────────────────────
   layout.css — App shell, sidebar, canvas area
   ───────────────────────────────────────────── */

#app {
  display: flex;
  height: 100dvh;
  overflow: hidden;
}

/* ── Sidebar ── */
#sidebar {
  width: 300px;
  min-width: 300px;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 10;
}

#sidebar-header {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.logo-mark {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.logo-name {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1;
}
.logo-name span { color: var(--color-primary); }

#sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
#sidebar-scroll::-webkit-scrollbar { width: 3px; }
#sidebar-scroll::-webkit-scrollbar-track { background: transparent; }
#sidebar-scroll::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

.sidebar-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.divider {
  height: 1px;
  background: var(--color-divider);
  margin: 0 calc(-1 * var(--space-4));
}

/* ── Canvas area ── */
#canvas-wrap {
  flex: 1;
  position: relative;
  overflow: hidden;
}

#canvas-wrap canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

/* ── Canvas overlays ── */
#canvas-controls {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

#axes-labels {
  position: absolute;
  bottom: var(--space-4);
  left: var(--space-4);
  display: flex;
  gap: var(--space-2);
  pointer-events: none;
}

#info-panel {
  position: absolute;
  bottom: var(--space-4);
  right: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  box-shadow: var(--shadow-md);
  max-width: 190px;
  line-height: 1.7;
}
#info-panel strong {
  color: var(--color-text);
  display: block;
  margin-bottom: 2px;
  font-weight: 600;
}

/* ── Analysis panel (printed near graph) ── */
#analysis-panel {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text);
  box-shadow: var(--shadow-md);
  max-width: 290px;
  display: none;
  line-height: 1.8;
  pointer-events: none;
}
#analysis-panel.visible {
  display: block;
}
#analysis-panel .analysis-title {
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-divider);
  padding-bottom: var(--space-1);
  font-family: var(--font-mono);
  word-break: break-all;
}
#analysis-panel .analysis-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
}
#analysis-panel .analysis-label {
  color: var(--color-text-muted);
}
#analysis-panel .analysis-value {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text);
}

/* ── Mobile ── */
#mobile-toggle {
  display: none;
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 50;
  width: 38px;
  height: 38px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
}

@media (max-width: 768px) {
  #mobile-toggle { display: flex; }

  #sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    width: 280px;
    transform: translateX(-100%);
    transition: transform 280ms cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 100;
    box-shadow: var(--shadow-lg);
  }
  #sidebar.open { transform: translateX(0); }

  #canvas-wrap { width: 100%; }
}