/**
 * Strata-Graph Core Styles
 * Framework-agnostic CSS custom properties and layout rules.
 */

:root {
  /* Canvas & Viewport */
  --sg-canvas-bg: #EAEBD7;
  --sg-canvas-height: 620px;
  --sg-canvas-border: 2px solid #1A1A1A;
  --sg-canvas-shadow: 2px 2px 5px rgba(0, 0, 0, 0.1);

  /* Nodes */
  --sg-node-folder-radius: 42px;
  --sg-node-article-radius: 34px;
  --sg-node-border-color: #1A1A1A;
  --sg-node-border-width: 2px;
  --sg-node-folder-border-color: #8EA8B5;
  --sg-node-folder-border-width: 3px;
  --sg-node-hover-ring: rgba(140, 166, 142, 0.6);
  --sg-node-bg-fallback: #D8D9C5;

  /* Badges & Pills */
  --sg-badge-bg: #8CA68E;
  --sg-badge-text: #FFFFFF;
  --sg-badge-font: 'JetBrains Mono', monospace;
  --sg-badge-size: 10px;

  /* Links & Connections */
  --sg-link-color: rgba(26, 26, 26, 0.25);
  --sg-link-active-color: #8EA8B5;
  --sg-link-width: 1.5px;

  /* Typography & Labels */
  --sg-label-font: 'JetBrains Mono', monospace, sans-serif;
  --sg-label-color: #1A1A1A;
  --sg-label-size: 11px;
  --sg-label-bg: rgba(234, 235, 215, 0.92);
  --sg-label-border: 1px solid rgba(26, 26, 26, 0.2);

  /* Breadcrumb Navigation */
  --sg-breadcrumb-bg: #EAEBD7;
  --sg-breadcrumb-border: 1px solid #1A1A1A;
  --sg-breadcrumb-text: #1A1A1A;
  --sg-breadcrumb-active: #8CA68E;
  --sg-breadcrumb-hover: #8EA8B5;

  /* Controls UI */
  --sg-control-bg: #EAEBD7;
  --sg-control-text: #1A1A1A;
  --sg-control-border: 1px solid #1A1A1A;
  --sg-control-hover-bg: #D8D9C5;
}

/* Container */
.strata-graph-wrapper {
  position: relative;
  width: 100%;
  box-sizing: border-box;
  font-family: var(--sg-label-font);
  user-select: none;
}

/* Header & Breadcrumb Bar */
.strata-graph-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 0.75rem;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--sg-node-border-color);
  background: var(--sg-breadcrumb-bg);
}

.strata-graph-breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.strata-graph-crumb {
  background: transparent;
  border: 1px solid var(--sg-breadcrumb-text);
  color: var(--sg-breadcrumb-text);
  padding: 0.25rem 0.6rem;
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  text-transform: uppercase;
}

.strata-graph-crumb:hover {
  background: var(--sg-breadcrumb-hover);
  color: #FFFFFF;
  border-color: var(--sg-breadcrumb-hover);
}

.strata-graph-crumb.active {
  background: var(--sg-breadcrumb-active);
  color: #FFFFFF;
  border-color: var(--sg-breadcrumb-active);
  cursor: default;
}

.strata-graph-separator {
  color: var(--sg-breadcrumb-text);
  opacity: 0.6;
}

.strata-graph-level-meta {
  font-size: 0.75rem;
  color: #4A4A4A;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.strata-graph-count-pill {
  background: #1A1A1A;
  color: #EAEBD7;
  padding: 0.15rem 0.45rem;
  font-size: 0.7rem;
  font-weight: 700;
}

/* Viewport & Canvas */
.strata-graph-viewport {
  position: relative;
  width: 100%;
  height: var(--sg-canvas-height);
  border: var(--sg-canvas-border);
  background: var(--sg-canvas-bg);
  box-shadow: var(--sg-canvas-shadow);
  overflow: hidden;
}

.strata-graph-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
}

.strata-graph-canvas.is-dragging {
  cursor: grabbing;
}

.strata-graph-canvas.is-hovering {
  cursor: pointer;
}

/* Floating Controls Overlay */
.strata-graph-controls {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  z-index: 10;
}

.strata-graph-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--sg-control-bg);
  border: var(--sg-control-border);
  color: var(--sg-control-text);
  font-family: inherit;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
  transition: all 0.15s ease;
}

.strata-graph-btn:hover {
  background: var(--sg-control-hover-bg);
  transform: translateY(-1px);
}

.strata-graph-btn:active {
  transform: translateY(0);
}

/* Floating Legend / Hint */
.strata-graph-hint {
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  background: rgba(234, 235, 215, 0.9);
  border: 1px solid rgba(26, 26, 26, 0.3);
  padding: 0.3rem 0.6rem;
  font-size: 0.7rem;
  color: #4A4A4A;
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.strata-graph-hint-item {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.strata-graph-hint-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.strata-graph-hint-dot.folder {
  background: var(--sg-node-folder-color, #3D7068);
  border: 1px solid #1A1A1A;
  border-radius: 2px;
  width: 9px;
  height: 8px;
}

.strata-graph-hint-dot.article {
  background: var(--sg-node-polaroid-bg, #FAF7F0);
  border: 1.2px solid #1A1A1A;
  border-radius: 1px;
  width: 8px;
  height: 10px;
}