/* ========================================================================
   Chaos Explorer — Light Editorial
   Fraunces (display) · Instrument Sans (body) · JetBrains Mono (numbers)
   ======================================================================== */

:root {
  --bg:       #f6f3ea;
  --paper:    #fdfbf4;
  --paper-2:  #f1ecdf;
  --line:     #e1dbcb;
  --line-2:   #c6bfac;

  --ink:      #141310;
  --ink-2:    #3a3630;
  --ink-dim:  #625b4f;
  --ink-mute: #8e867a;

  --accent:      #8d2d1c;
  --accent-soft: #c55b3b;
  --cool:        #203955;
  --cool-soft:   #6e8aad;
  --warm:        #6e4a2c;
  --ok:          #355b2d;

  --radius:    6px;
  --radius-sm: 3px;

  --font-display: "Fraunces", "Times New Roman", serif;
  --font-body:    "Instrument Sans", system-ui, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: var(--accent); color: var(--paper); }

.grain {
  position: fixed; inset: 0;
  pointer-events: none;
  opacity: 0.04;
  mix-blend-mode: multiply;
  z-index: 1;
  width: 100%; height: 100%;
}

kbd {
  font-family: var(--font-mono);
  font-size: 10.5px;
  padding: 1px 5px;
  border: 1px solid var(--line-2);
  border-bottom-width: 2px;
  border-radius: 3px;
  background: var(--paper);
  color: var(--ink-dim);
}

a { color: var(--accent); border-bottom: 1px solid var(--line-2); text-decoration: none; }
a:hover { border-bottom-color: var(--accent); }

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* Math typography: italic serif (VL-Konvention, LaTeX-Stil).
   Used where Greek letters appear so α, μ etc. render with their classical
   curly forms instead of JetBrains-Mono glyphs that look like Latin a/u. */
.sym, .math {
  font-family: var(--font-display);
  font-style: italic;
  font-variation-settings: "opsz" 14, "SOFT" 30;
  letter-spacing: 0;
  text-transform: none;
}

/* ----- Header with Map Switcher ----- */

.site-header {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: end;
  gap: 40px;
  padding: 40px 56px 20px;
  border-bottom: 1px solid var(--line);
  max-width: 1680px;
  margin: 0 auto;
}

.brand-kicker {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: block;
  margin-bottom: 8px;
}

.brand-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(28px, 3.5vw, 44px);
  line-height: 0.98;
  letter-spacing: -0.022em;
  margin: 0;
  color: var(--ink);
  font-variation-settings: "SOFT" 0, "opsz" 144;
}
.brand-title em {
  font-style: italic;
  font-weight: 300;
  color: var(--ink-2);
  font-variation-settings: "SOFT" 20, "opsz" 144;
}

.map-switcher {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
  justify-self: stretch;
  max-width: 680px;
  justify-self: end;
}

.map-opt { cursor: pointer; display: block; }
.map-opt input { display: none; }
.map-opt-body {
  display: block;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
  transition: all 120ms;
  text-align: left;
}
.map-opt:hover .map-opt-body { border-color: var(--line-2); }
.map-opt input:checked + .map-opt-body {
  border-color: var(--accent);
  background: var(--paper);
  box-shadow: inset 0 0 0 1px var(--accent);
}
.map-name {
  display: block;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 450;
  font-variation-settings: "SOFT" 20;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.map-opt input:checked + .map-opt-body .map-name { color: var(--accent); }
.map-eq {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 13px;
  font-variation-settings: "opsz" 14, "SOFT" 30;
  color: var(--ink-mute);
  display: block;
  margin-top: 3px;
  letter-spacing: 0;
}

/* ----- Readout bar ----- */

.readout-bar {
  max-width: 1680px;
  margin: 0 auto;
  padding: 14px 56px;
  display: flex;
  gap: 36px;
  border-bottom: 1px solid var(--line);
  background: transparent;
  position: relative;
  z-index: 2;
}

.readout {
  display: flex;
  flex-direction: column;
  min-width: 90px;
}
.readout-key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 2px;
}
.readout-key.readout-key--sym {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 15px;
  font-variation-settings: "opsz" 14, "SOFT" 30;
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink-2);
  line-height: 1;
  margin-bottom: 4px;
}
.readout-value {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--ink);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.readout-value.regime {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: 16px;
  font-variation-settings: "SOFT" 30;
  color: var(--accent);
}

/* Fixpunkt-Dots (ersetzt hässliche Unicode ●/○) */
#ro-fps { display: inline-flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.fp-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  line-height: 1;
}
.fp-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  box-sizing: border-box;
  flex-shrink: 0;
}
.fp-dot--stable {
  background: var(--accent);
}
.fp-dot--unstable {
  background: transparent;
  border: 1.5px solid var(--cool);
}
.fp-val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  color: var(--ink);
}

/* ----- Stage ----- */

.stage {
  position: relative;
  z-index: 2;
  max-width: 1680px;
  margin: 0 auto;
  padding: 24px 56px 80px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

@media (max-width: 1100px) {
  .site-header { grid-template-columns: 1fr; padding: 24px 20px 16px; gap: 20px; }
  .map-switcher { grid-template-columns: repeat(3, 1fr); max-width: unset; justify-self: stretch; }
  .readout-bar { padding: 12px 20px; gap: 20px; overflow-x: auto; }
  .stage { padding: 16px 20px 60px; }
}

/* ----- Panels ----- */

.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px 10px;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.panel-header h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 16px;
  font-variation-settings: "SOFT" 20;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.panel-header h2 em {
  font-style: italic;
  color: var(--ink-2);
}

.panel-tools {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  color: var(--ink-mute);
  flex-wrap: wrap;
}
.panel-tools .hint {
  font-family: var(--font-mono);
  font-size: 11px;
}

.tool {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 9px;
  border: 1px solid var(--line-2);
  background: transparent;
  color: var(--ink-dim);
  border-radius: 2px;
  cursor: pointer;
  transition: all 120ms;
}
.tool:hover { color: var(--accent); border-color: var(--accent); }

.chk {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-dim);
  cursor: pointer;
  user-select: none;
}
.chk input[type="checkbox"] { accent-color: var(--accent); width: 13px; height: 13px; }

.ctrl-inline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-dim);
}
.ctrl-inline input[type="range"] { width: 110px; }

.canvas-wrap {
  padding: 10px;
  background: var(--paper);
  position: relative;
}
.canvas-wrap canvas {
  display: block;
  width: 100%;
  height: auto;
}
.canvas-square { aspect-ratio: 1 / 1; }
.canvas-square canvas { height: 100%; }
.canvas-bif canvas { aspect-ratio: 10 / 3; }

.bif-alpha-marker {
  position: absolute;
  width: 0;
  border-left: 1px dashed var(--accent);
  pointer-events: none;
  z-index: 3;
  will-change: left;
}

.cursor-readout {
  position: absolute;
  pointer-events: none;
  background: var(--ink);
  color: var(--paper);
  border-radius: 3px;
  padding: 5px 9px;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 13px;
  font-variation-settings: "opsz" 14, "SOFT" 30;
  letter-spacing: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
  z-index: 5;
  box-shadow: 0 6px 14px -4px rgba(0,0,0,0.15);
}

/* ----- α Rail ----- */

.alpha-rail {
  padding: 14px 18px 14px;
  border-top: 1px solid var(--line);
  background: var(--paper-2);
}
.alpha-rail-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
}
.alpha-rail-head label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.alpha-rail-head label .sym {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 14px;
  font-variation-settings: "opsz" 14, "SOFT" 30;
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink-2);
  margin: 0 2px;
}
.alpha-unit {
  color: var(--ink-dim);
  font-weight: normal;
  text-transform: none;
  letter-spacing: 0;
}
.alpha-rail-head output {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.alpha-slider-wrap {
  position: relative;
  padding: 0 0 4px 0;
}

.alpha-ticks {
  position: absolute;
  inset: 0 0 auto 0;
  height: 40px;
  pointer-events: none;
}
.alpha-ticks .lm-tick {
  position: absolute;
  bottom: 2px;
  width: 1px;
  height: 6px;
  transform: translateX(-50%);
  background: var(--accent);
  opacity: 0.55;
}
.alpha-ticks .landmark {
  position: absolute;
  top: 0;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: var(--ink-mute);
  letter-spacing: 0.02em;
  text-align: center;
  line-height: 1.12;
  max-width: 110px;
  white-space: normal;
}
.alpha-ticks .landmark .lm-key {
  display: block;
  color: var(--ink-2);
  font-weight: 500;
}
.alpha-ticks .landmark .lm-note {
  display: block;
  margin-top: 1px;
  color: var(--ink-dim);
  font-size: 9px;
}
.alpha-ticks .landmark.lm-row1 { top: 20px; }
.alpha-ticks .landmark.lm-right { transform: translateX(calc(-100% + 4px)); text-align: right; }
.alpha-ticks .landmark.lm-left  { transform: translateX(-4px); text-align: left; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 2px;
  background: var(--line-2);
  outline: none;
  cursor: pointer;
}
.alpha-slider-wrap input[type="range"] {
  margin-top: 48px;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--paper);
  cursor: grab;
  box-shadow: 0 0 0 1px var(--accent);
}
input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--paper);
  cursor: grab;
  box-shadow: 0 0 0 1px var(--accent);
}

.alpha-rail-foot {
  margin-top: 10px;
}
.tool-row {
  display: flex;
  gap: 20px;
  align-items: center;
  flex-wrap: wrap;
}
.tool-row .hint { font-family: var(--font-mono); font-size: 11px; color: var(--ink-mute); }

/* ----- Row 2: Cobweb + Time series ----- */

.panel-row-2 {
  display: grid;
  grid-template-columns: minmax(380px, 480px) 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 1100px) {
  .panel-row-2 { grid-template-columns: 1fr; }
}

.x0-rail {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 18px;
  border-top: 1px solid var(--line);
  background: var(--paper-2);
}
.x0-rail label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-mute);
  min-width: 22px;
}
.x0-rail input[type="range"] { flex: 1; }
.x0-rail output {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  min-width: 50px;
  text-align: right;
}

/* ----- Compare panel ----- */

.panel-compare[hidden] { display: none; }

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
  padding: 14px;
  background: var(--paper);
}
.compare-panel {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--paper);
}
.compare-label {
  position: absolute;
  top: 6px;
  left: 8px;
  font-family: var(--font-display);
  font-size: 12.5px;
  font-style: italic;
  font-variation-settings: "SOFT" 20;
  color: var(--ink-dim);
  background: rgba(253,251,244,0.85);
  padding: 1px 6px;
  border-radius: 2px;
  z-index: 1;
}
.compare-panel canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
}

/* ----- Info panel ----- */

.panel-info .info-body {
  padding: 18px 22px 20px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 32px;
  background: var(--paper);
}
.info-block h4 {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 500;
}
.info-block .value {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
  line-height: 1.7;
  font-variant-numeric: tabular-nums;
}
.info-block .value .fp-row {
  display: grid;
  grid-template-columns: 1fr auto;
  column-gap: 14px;
  align-items: baseline;
  padding: 4px 0;
  border-bottom: 1px dotted var(--line);
}
.info-block .value .fp-row:last-child { border-bottom: none; }
.info-block .value .fp-expr {
  color: var(--ink);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 15px;
  font-variation-settings: "opsz" 14, "SOFT" 30;
  letter-spacing: 0;
}
.info-block .value .fp-meta { color: var(--ink-dim); font-size: 11.5px; }
.info-block .value .stable   { color: var(--accent); font-weight: 500; }
.info-block .value .unstable { color: var(--cool);   font-weight: 500; }
.info-block .value .regime-word {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 17px;
  font-variation-settings: "SOFT" 30;
  color: var(--accent);
  display: block;
  line-height: 1.1;
  margin-bottom: 4px;
}
.info-block .value .notes {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--ink-dim);
  margin-top: 4px;
  line-height: 1.55;
}
.info-block .formula {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 14px;
  font-variation-settings: "opsz" 14, "SOFT" 30;
  color: var(--ink-2);
  background: var(--paper-2);
  padding: 10px 12px;
  border-radius: 3px;
  margin-top: 8px;
  line-height: 1.6;
  letter-spacing: 0;
}
.info-block .formula-row {
  display: block;
  margin: 3px 0;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 14.5px;
  font-variation-settings: "opsz" 14, "SOFT" 30;
  color: var(--ink);
  letter-spacing: 0;
}
.info-block .formula-row .lhs {
  color: var(--ink-mute);
  margin-right: 8px;
  font-style: italic;
}
sub, sup {
  font-family: var(--font-mono);
  font-size: 0.72em;
  line-height: 0;
}

@media (max-width: 1100px) {
  .panel-info .info-body { grid-template-columns: 1fr; gap: 16px; }
}

/* ----- Legend ----- */

.legend {
  display: grid;
  grid-template-columns: 1.2fr 1fr 0.8fr;
  gap: 36px;
  padding: 28px 0 0;
  border-top: 1px solid var(--line);
  margin-top: 14px;
}
.legend-item h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 400;
  font-variation-settings: "SOFT" 20;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 0 0 8px;
}
.legend-item p {
  color: var(--ink-dim);
  font-size: 13.5px;
  line-height: 1.6;
  margin: 0;
}
.legend-item.meta {
  font-style: italic;
  color: var(--ink-mute);
  border-left: 1px solid var(--line);
  padding-left: 22px;
}

@media (max-width: 900px) {
  .legend { grid-template-columns: 1fr; gap: 18px; }
}

/* ----- Entry animation ----- */

.site-header, .readout-bar, .panel, .legend-item {
  opacity: 0;
  transform: translateY(4px);
  animation: rise 520ms cubic-bezier(0.2, 0.7, 0.25, 1) forwards;
}
.site-header { animation-delay: 40ms; }
.readout-bar { animation-delay: 90ms; }
.panel-bifurcation { animation-delay: 150ms; }
.panel-row-2 .panel-cobweb { animation-delay: 220ms; }
.panel-row-2 .panel-timeseries { animation-delay: 270ms; }
.panel-info { animation-delay: 340ms; }
.legend-item { animation-delay: 420ms; }

@keyframes rise {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}