/* === TOKEN SYSTEM === */
:root {
  --bg: #EEECEA;
  --bg-panel: #F9F8F6;
  --bg-cli: #F3F2F0;
  --grid-dot: rgba(155, 150, 142, 0.20);
  --border: #D4D1CB;
  --border-subtle: #E0DDDA;
  --text: #1C1B19;
  --text-bright: #0C0B0A;
  /* Slightly darker dim for AA+ on warm paper bg (was #6E6A65 ≈4.56). */
  --text-dim: #5C5854;
  --text-mid: #4A4744;
  --accent: #4A6B8A;
  --accent-hover: #385572;
  --link: #4A6B8A;
  --link-hover: #385572;
  --node-fill: #1C1B19;
  --node-stroke: #1C1B19;
  --node-open-fill: #FFFFFF;
  /* Match essay --edge-stroke / --faded-opacity (iso+sammy graph standard). */
  --edge-stroke: #6E6A65;
  --hl-border: rgba(28, 27, 25, 0.15);
  --hl-bg: rgba(28, 27, 25, 0.04);
  --faded-opacity: 0.14;
  --scrollbar-thumb: rgba(28, 27, 25, 0.12);
  --prompt-color: #4A6B8A;
  --cmd-bg: #EEECEA;
  --input-color: #1C1B19;
  --legend-bg: rgba(249, 248, 246, 0.92);
  --legend-border: #D4D1CB;
  --info-color: #5C5854;
  --origin-aw: #4A6B8A;
  --origin-kg: #5C5854;
  --focus-ring: #4A6B8A;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #2A2520;
    --bg-panel: #252019;
    --bg-cli: #2E2822;
    --grid-dot: rgba(68, 60, 50, 0.55);
    --border: #3E372E;
    --border-subtle: #352F28;
    --text: #D4CCC0;
    --text-bright: #E8E0D4;
    /* Was #8A8278 (~4.0:1 on bg) — below WCAG AA for normal text. */
    --text-dim: #A09890;
    --text-mid: #A8A098;
    --accent: #7DB8A6;
    --accent-hover: #9ECEBE;
    --link: #7DB8A6;
    --link-hover: #9ECEBE;
    --node-fill: #B0A898;
    --node-stroke: #B0A898;
    --node-open-fill: #252019;
    --edge-stroke: #7A7268;
    --hl-border: rgba(232, 224, 212, 0.15);
    --hl-bg: rgba(232, 224, 212, 0.04);
    --faded-opacity: 0.12;
    --scrollbar-thumb: rgba(232, 224, 212, 0.10);
    --prompt-color: #7DB8A6;
    --cmd-bg: #2A2520;
    --input-color: #E8E0D4;
    --legend-bg: rgba(37, 32, 25, 0.92);
    --legend-border: #3E372E;
    --info-color: #A09890;
    --origin-aw: #7DB8A6;
    --origin-kg: #A09890;
    --focus-ring: #7DB8A6;
  }
}

:root[data-theme="dark"] {
  --bg: #2A2520;
  --bg-panel: #252019;
  --bg-cli: #2E2822;
  --grid-dot: rgba(68, 60, 50, 0.55);
  --border: #3E372E;
  --border-subtle: #352F28;
  --text: #D4CCC0;
  --text-bright: #E8E0D4;
  --text-dim: #A09890;
  --text-mid: #A8A098;
  --accent: #7DB8A6;
  --accent-hover: #9ECEBE;
  --link: #7DB8A6;
  --link-hover: #9ECEBE;
  --node-fill: #B0A898;
  --node-stroke: #B0A898;
  --node-open-fill: #252019;
  --edge-stroke: #7A7268;
  --hl-border: rgba(232, 224, 212, 0.15);
  --hl-bg: rgba(232, 224, 212, 0.04);
  --faded-opacity: 0.12;
  --scrollbar-thumb: rgba(232, 224, 212, 0.10);
  --prompt-color: #7DB8A6;
  --cmd-bg: #2A2520;
  --input-color: #E8E0D4;
  --legend-bg: rgba(37, 32, 25, 0.92);
  --legend-border: #3E372E;
  --info-color: #A09890;
  --origin-aw: #7DB8A6;
  --origin-kg: #A09890;
  --focus-ring: #7DB8A6;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'SF Mono', 'Consolas', 'Menlo', 'Courier New', monospace;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  /* 15px: elderly-friendlier than 13px while keeping explorer density. */
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* === TOP BAR === */
#top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  flex-shrink: 0;
}

#top-bar h1 {
  font-family: -apple-system, 'Segoe UI', 'Gill Sans', 'Helvetica Neue', Arial, sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-bright);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

#top-bar .sub {
  font-family: -apple-system, 'Segoe UI', 'Gill Sans', 'Helvetica Neue', Arial, sans-serif;
  font-size: 12px;
  font-weight: 400;
  color: var(--text-dim);
  margin-left: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

#view-toggle {
  display: flex;
  gap: 2px;
  background: var(--bg);
  border-radius: 4px;
  padding: 2px;
  border: 1px solid var(--border-subtle);
}

#view-toggle button {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-family: -apple-system, 'Segoe UI', sans-serif;
  font-size: 13px;
  padding: 5px 12px;
  cursor: pointer;
  border-radius: 3px;
  transition: all 0.15s ease;
  letter-spacing: 0.02em;
}

#view-toggle button.active {
  background: var(--accent);
  color: #FFFFFF;
}

#view-toggle button:hover:not(.active) {
  color: var(--text-bright);
  background: var(--hl-bg);
}

#view-toggle button:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}

/* === COMMAND BAR === */
#command-bar {
  display: flex;
  align-items: center;
  padding: 8px 20px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--cmd-bg);
  flex-shrink: 0;
}

.prompt {
  color: var(--prompt-color);
  font-size: 14px;
  margin-right: 8px;
  user-select: none;
  font-weight: 600;
}

#cmd-input {
  background: transparent;
  border: none;
  color: var(--input-color);
  font-family: 'SF Mono', 'Consolas', 'Menlo', 'Courier New', monospace;
  font-size: 13px;
  flex: 1;
  outline: none;
}

#cmd-input::placeholder { color: var(--text-dim); opacity: 0.6; }

#cmd-input:focus { caret-color: var(--accent); }

/* === MAIN LAYOUT === */
#main { display: flex; flex: 1; overflow: hidden; }

#text-panel {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
  min-width: 120px;
  background: var(--bg-cli);
}

#splitter {
  width: 5px;
  cursor: col-resize;
  background: var(--border);
  flex-shrink: 0;
  position: relative;
  z-index: 10;
  transition: background 0.15s;
}
#splitter:hover, #splitter.dragging {
  background: var(--accent);
}
#splitter.hidden { display: none; }

#output {
  font-family: 'SF Mono', 'Consolas', 'Menlo', 'Courier New', monospace;
  font-size: 12px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-wrap: break-word;
  color: var(--text);
}

/* Links and interactive elements */
.nl {
  color: var(--text-bright);
  cursor: pointer;
  border-bottom: 1px dotted var(--border);
  font-weight: 500;
}
.nl:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.cl {
  color: var(--accent);
  cursor: pointer;
}
.cl:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.dim { color: var(--text-dim); }
.hdr { color: var(--text-bright); font-weight: 600; }
.origin-aw { color: var(--origin-aw); }
.origin-kg { color: var(--origin-kg); }

/* === GRAPH PANEL === */
#graph-panel {
  width: var(--graph-width, 45%);
  min-width: 200px;
  position: relative;
  flex-shrink: 0;
  background: var(--bg-panel);
}

#graph-panel.hidden { display: none; }

#cy { width: 100%; height: 100%; }

/* === BOX-SELECT ZOOM (Ctrl/Meta + drag, same as essay) === */
#box-select-rect {
  position: absolute;
  border: 1.5px dashed var(--accent);
  background: rgba(74, 107, 138, 0.08);
  pointer-events: none;
  z-index: 20;
}
:root[data-theme="dark"] #box-select-rect {
  background: rgba(125, 184, 166, 0.10);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) #box-select-rect {
    background: rgba(125, 184, 166, 0.10);
  }
}
#graph-panel.box-selecting {
  cursor: crosshair;
}
#graph-panel.box-selecting #cy {
  pointer-events: none;
}

/* Bottom-left stack: zoom hint above legend (no overlap). */
#graph-chrome-bl {
  position: absolute;
  bottom: 10px;
  left: 10px;
  z-index: 11;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  max-width: min(280px, calc(100% - 20px));
  pointer-events: none;
}

.graph-hint {
  font-family: -apple-system, 'Segoe UI', 'Gill Sans', 'Helvetica Neue', Arial, sans-serif;
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--text-mid);
  pointer-events: none;
}
.graph-hint kbd {
  display: inline-block;
  padding: 0.1em 0.4em;
  font-family: inherit;
  font-size: inherit;
  font-weight: 600;
  line-height: 1;
  color: var(--text-mid);
  background: var(--legend-bg);
  border: 1px solid var(--legend-border);
  border-radius: 2px;
}

#graph-legend {
  background: var(--legend-bg);
  border: 1px solid var(--legend-border);
  border-radius: 4px;
  padding: 10px 16px;
  font-size: 14px;
  max-height: 40vh;
  overflow-y: auto;
  font-family: -apple-system, 'Segoe UI', 'Gill Sans', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  pointer-events: auto;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 2px 0;
}

.ldot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.ldot-open {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
  background: var(--node-open-fill);
  border: 2px solid var(--node-stroke);
}

#graph-info {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--legend-bg);
  border: 1px solid var(--legend-border);
  border-radius: 4px;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--text);
  z-index: 5;
  font-family: -apple-system, 'Segoe UI', sans-serif;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* === SCROLLBAR === */
#text-panel::-webkit-scrollbar { width: 6px; }
#text-panel::-webkit-scrollbar-track { background: transparent; }
#text-panel::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 3px; }

/* === RESPONSIVE === */
@media (max-width: 900px) {
  #main { flex-direction: column; }
  #graph-panel { width: 100%; height: 40vh; border-left: none; border-top: 1px solid var(--border); }
  #text-panel { flex: 1; }
}

/* === IMMERSIVE (GRAPH-ONLY) MODE === */
body.immersive #top-bar,
body.immersive #command-bar,
body.immersive #text-panel { display: none; }

body.immersive #main { flex: 1; }

body.immersive #graph-panel {
  width: 100%;
  border-left: none;
  flex: 1;
}

#immersive-back {
  display: none;
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 20;
  background: var(--legend-bg);
  border: 1px solid var(--legend-border);
  border-radius: 4px;
  padding: 8px 18px;
  font-family: -apple-system, 'Segoe UI', 'Gill Sans', 'Helvetica Neue', Arial, sans-serif;
  font-size: 14px;
  color: var(--text);
  cursor: pointer;
  letter-spacing: 0.03em;
  transition: color 0.15s ease, border-color 0.15s ease;
}
#immersive-back:hover {
  color: var(--text-bright);
  border-color: var(--accent);
}
#immersive-back:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}
body.immersive #immersive-back { display: block; }

#immersive-title {
  display: none;
  position: absolute;
  top: 48px;
  left: 12px;
  z-index: 20;
  font-family: -apple-system, 'Segoe UI', 'Gill Sans', 'Helvetica Neue', Arial, sans-serif;
  font-size: 20px;
  font-weight: 600;
  color: var(--text-bright);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}
#immersive-title .title-sym {
  color: var(--accent);
  margin: 0 6px;
  font-weight: 400;
}
body.immersive #immersive-title { display: block; }

#hop-toggle {
  display: none;
  position: absolute;
  bottom: 12px;
  right: 12px;
  z-index: 20;
  background: var(--legend-bg);
  border: 1px solid var(--legend-border);
  border-radius: 4px;
  padding: 2px;
  gap: 2px;
}
#hop-toggle button {
  background: transparent;
  border: none;
  color: var(--text);
  font-family: -apple-system, 'Segoe UI', sans-serif;
  font-size: 14px;
  padding: 6px 16px;
  cursor: pointer;
  border-radius: 3px;
  transition: all 0.15s ease;
  letter-spacing: 0.02em;
}
#hop-toggle button.active {
  background: var(--accent);
  color: #FFFFFF;
}
#hop-toggle button:hover:not(.active) {
  color: var(--text-bright);
  background: var(--hl-bg);
}
body.immersive #hop-toggle { display: flex; }

/* Top-bar theme (always on in dual-view / CLI); float copy for Graph Only. */
#theme-toggle,
#theme-toggle-float {
  display: flex;
  background: var(--bg);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 2px;
}
#theme-toggle-float {
  display: none;
  position: absolute;
  bottom: 12px;
  right: 180px;
  z-index: 20;
  background: var(--legend-bg);
  border-color: var(--legend-border);
}
.theme-btn {
  background: transparent;
  border: none;
  color: var(--text);
  font-family: -apple-system, 'Segoe UI', sans-serif;
  font-size: 13px;
  padding: 5px 12px;
  cursor: pointer;
  border-radius: 3px;
  transition: all 0.15s ease;
  letter-spacing: 0.02em;
}
.theme-btn:hover {
  color: var(--text-bright);
  background: var(--hl-bg);
}
.theme-btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}
body.immersive #theme-toggle-float { display: flex; }
@media (max-width: 900px) {
  .graph-hint { display: none; }
}

#immersive-search {
  display: none;
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 25;
  width: 280px;
}
body.immersive #immersive-search { display: block; }
#imm-search-input {
  width: 100%;
  padding: 8px 14px;
  font-family: -apple-system, 'Segoe UI', sans-serif;
  font-size: 14px;
  border: 1px solid var(--legend-border);
  border-radius: 4px;
  background: var(--legend-bg);
  color: var(--text);
  outline: none;
  backdrop-filter: blur(12px);
}
#imm-search-input::placeholder { color: var(--text-dim); opacity: 0.6; }
#imm-search-input:focus { border-color: var(--accent); }
#imm-search-results {
  display: none;
  margin-top: 2px;
  background: var(--legend-bg);
  border: 1px solid var(--legend-border);
  border-radius: 4px;
  max-height: 300px;
  overflow-y: auto;
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
#imm-search-results.visible { display: block; }
.imm-sr-item {
  padding: 8px 14px;
  font-family: -apple-system, 'Segoe UI', sans-serif;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  border-bottom: 1px solid var(--legend-border);
  line-height: 1.4;
}
.imm-sr-item:last-child { border-bottom: none; }
.imm-sr-item:hover, .imm-sr-item.focused { background: var(--hl-bg); }
.imm-sr-item .sr-origin {
  font-size: 12px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-left: 6px;
}

#node-panel {
  display: none;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  width: 340px;
  min-width: 220px;
  max-width: 60vw;
  overflow-y: auto;
  background: var(--legend-bg);
  border-left: 1px solid var(--legend-border);
  padding: 18px 20px 60px 20px;
  backdrop-filter: blur(12px);
  box-shadow: -4px 0 20px rgba(0,0,0,0.12);
  font-family: -apple-system, 'Segoe UI', 'Gill Sans', 'Helvetica Neue', Arial, sans-serif;
}
#node-panel .np-resize {
  position: absolute;
  top: 0;
  left: -4px;
  bottom: 0;
  width: 8px;
  cursor: col-resize;
  z-index: 25;
}
#node-panel .np-resize:hover,
#node-panel .np-resize.dragging {
  background: var(--accent);
  opacity: 0.3;
}

#node-panel .np-close {
  position: absolute;
  top: 8px;
  right: 12px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 16px;
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}
#node-panel .np-close:hover { color: var(--text-bright); }

#node-panel .np-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 4px;
  line-height: 1.3;
  padding-right: 24px;
}

#node-panel .np-type {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 10px;
  font-weight: 500;
}

#node-panel .np-summary {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  margin-bottom: 14px;
}

#node-panel .np-edges {
  font-size: 13px;
  line-height: 1.7;
  font-family: 'SF Mono', 'Consolas', 'Menlo', 'Courier New', monospace;
}

#node-panel .np-edges .np-pred {
  color: var(--accent);
  font-style: italic;
}

#node-panel .np-edges .np-target {
  color: var(--text-bright);
  cursor: pointer;
  border-bottom: 1px dotted var(--border);
}
#node-panel .np-edges .np-target:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

#node-panel .np-section {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-top: 12px;
  margin-bottom: 4px;
  font-weight: 500;
}

#node-panel::-webkit-scrollbar { width: 4px; }
#node-panel::-webkit-scrollbar-track { background: transparent; }
#node-panel::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 3px; }

#node-panel .np-link-section {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
#node-panel .np-link-cta {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}
#node-panel .np-link a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: all 0.15s ease;
  word-break: break-all;
}
#node-panel .np-link a:hover {
  color: var(--accent-hover);
  border-color: var(--accent);
  background: var(--hl-bg);
}
#node-panel .np-link-arrow {
  font-size: 14px;
  flex-shrink: 0;
}

/* === REDUCED MOTION === */
@media (prefers-reduced-motion: reduce) {
  #view-toggle button { transition: none; }
}