:root {
  --bg: #ffffff;
  --fg: #0a0a0a;
  --muted: rgba(10, 10, 10, 0.45);
  --line: rgba(0, 0, 0, 0.12);
  --panel-w: 15.5rem;
  --top-h: 3.25rem;
  --font: "SF Mono", "Menlo", "Consolas", "Liberation Mono", monospace;
  --seed-font: "Helvetica Neue", Helvetica, Arial, sans-serif;

  /* liquid glass (wie das drop-up bei inkdrops) */
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(0, 0, 0, 0.1);
  --glass-blur: blur(20px) saturate(1.15);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.65);
  --glass-radius: 22px;
  --glass-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  overflow: hidden;
}

button,
input {
  font: inherit;
}

/* —— topbar: text / draw — schwebende glass-pille —— */

.topbar {
  position: fixed;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
}

.input-modes {
  position: relative;
  display: flex;
  gap: 0.15rem;
  padding: 0.3rem;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  border-radius: var(--glass-radius);
  /* css-fallback — wird vom webgl-glass überdeckt, wenn verfügbar */
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-shadow);
}

/* webgl-glass — identisch für topbar + side-panel */
.ui-glass-canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: block;
  width: 100% !important;
  height: 100% !important;
  pointer-events: none;
}

.mode-tab {
  position: relative;
  z-index: 2;
  padding: 0.42rem 1.1rem;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  cursor: pointer;
  transition: color 0.2s var(--glass-ease), background 0.2s var(--glass-ease);
}

.mode-tab:hover {
  color: var(--fg);
}

.mode-tab.is-active {
  background: var(--fg);
  color: var(--bg);
}

/* —— leinwand —— */

.stage {
  position: fixed;
  inset: 0;
  z-index: 5;
  background: var(--bg);
}

.stage canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

body.is-text .stage canvas {
  cursor: text;
}

body.is-draw .stage canvas {
  cursor: crosshair;
}

/* —— texteingabe in der mitte —— */

.text-layer {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

body.is-text .text-layer {
  display: flex;
}

/* unsichtbarer spiegel — gleiche schrift-metrik wie das eingabefeld */
.seed-sizer {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  visibility: hidden;
  white-space: pre;
  font-size: 88px;
  font-weight: 700;
  font-family: var(--seed-font);
  line-height: 1.2;
  letter-spacing: 0;
  pointer-events: none;
}

.seed-input {
  min-width: 1ch;
  max-width: 95%;
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
  color: transparent; /* der text wird allein durch den wuchs auf der leinwand gezeichnet */
  font-size: 88px; /* dynamisch via JS — exakt wie die seed-größe */
  font-weight: 700;
  font-family: var(--seed-font);
  line-height: 1.2;
  letter-spacing: 0;
  text-align: center;
  outline: none;
  pointer-events: auto;
  caret-color: transparent;
}

.seed-input::selection {
  background: transparent;
  color: transparent;
}

.seed-input::placeholder {
  color: transparent;
}

/* —— rechtes panel — schwebendes liquid-glass —— */

.side-panel {
  position: fixed;
  top: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 40;
  width: var(--panel-w);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  border-radius: var(--glass-radius);
  /* css-fallback — wird vom webgl-glass überdeckt, wenn verfügbar */
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-shadow);
}

.panel-content {
  position: relative;
  z-index: 2;
  height: 100%;
  padding: 1.1rem 1rem;
  overflow-y: auto;
}

.panel-block {
  margin-bottom: 1.4rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--line);
}

.panel-block:last-child {
  border-bottom: none;
}

.panel-label {
  margin: 0 0 0.75rem;
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.growth-modes {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.growth-mode {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.45);
  color: var(--muted);
  font-size: 0.72rem;
  text-align: left;
  cursor: pointer;
  transition: color 0.2s var(--glass-ease), border-color 0.2s var(--glass-ease),
    background 0.2s var(--glass-ease), box-shadow 0.2s var(--glass-ease);
}

.growth-mode:hover:not(:disabled) {
  color: var(--fg);
  background: rgba(255, 255, 255, 0.75);
}

.growth-mode.is-active {
  color: var(--fg);
  background: rgba(255, 255, 255, 0.85);
  border-color: rgba(0, 0, 0, 0.25);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.07), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.growth-mode.is-soon {
  opacity: 0.38;
  cursor: not-allowed;
}

.growth-mode-name {
  text-transform: lowercase;
}

.growth-mode[data-mode="lab2"] .growth-mode-name {
  text-transform: none;
  font-size: 0.58rem;
  line-height: 1.15;
}

.growth-mode-tag {
  font-size: 0.58rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.mode-desc {
  margin: 0.55rem 0 0;
  font-size: 0.62rem;
  line-height: 1.55;
  color: var(--muted);
}

/* —— pinsel nur im draw-modus —— */

.draw-tools {
  display: none;
}

body.is-draw .draw-tools {
  display: block;
}

/* differential growth: nur zeichnung leeren, keine pinsel-dicke */
body.mode-lab2 .draw-brush-label,
body.mode-lab2 .draw-brush-control,
body.mode-diff3d .draw-brush-label,
body.mode-diff3d .draw-brush-control {
  display: none;
}

.reactor-tools {
  display: none;
}

body.mode-reactor .reactor-tools {
  display: block;
}

/* —— lab2 differential-growth-parameter nur im lab2-modus —— */

.lab2-tools {
  display: none;
}

body.mode-lab2 .lab2-tools {
  display: block;
}

/* klassische parameter (liniendicke/abstand/teilung) in lab2 ausblenden,
   tempo bleibt sichtbar */
body.mode-lab2 .classic-params {
  display: none;
}

.diff3d-tools {
  display: none;
}

body.mode-diff3d .diff3d-tools {
  display: block;
}

body.mode-diff3d .classic-params {
  display: none;
}

body.mode-diff3d .text-layer {
  display: none;
}

body.mode-diff3d.is-text .text-layer {
  display: none;
}

/* —— depth of field web —— */
.dof-tools {
  display: none;
}

body.mode-dof .dof-tools {
  display: block;
}

body.mode-dof .classic-params {
  display: none;
}

body.mode-dof .text-layer {
  display: none;
}

body.mode-dof .draw-brush-label,
body.mode-dof .draw-brush-control {
  display: none;
}

/* lab: eigener teilungs-abstand, klassische „teilung“ ausblenden */
.lab-tools {
  display: none;
}

body[data-mode="lab"] .lab-tools {
  display: block;
}

body[data-mode="lab"] .classic-param-c {
  display: none;
}

.lab2-max-hint {
  margin: 0.15rem 0 0.5rem;
  font-size: 0.58rem;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  opacity: 0.55;
}

#btn-l2-nodes,
#btn-d3-nodes {
  margin-top: 0.6rem;
}

.panel-input {
  width: 100%;
  padding: 0.45rem 0.55rem;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.55);
  color: var(--fg);
  font: inherit;
  font-size: 0.68rem;
}

.panel-input:focus {
  outline: none;
  border-color: rgba(0, 0, 0, 0.25);
  background: rgba(255, 255, 255, 0.85);
}

.reactor-font-hint {
  margin-top: 0.35rem;
}

/* —— regler —— */

.control {
  display: block;
  margin-bottom: 0.85rem;
}

.control-head {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.38rem;
  font-size: 0.68rem;
  text-transform: lowercase;
  color: var(--muted);
}

.control-val {
  font-variant-numeric: tabular-nums;
  color: var(--fg);
}

input[type="range"] {
  width: 100%;
  height: 3px;
  margin: 0;
  appearance: none;
  background: rgba(0, 0, 0, 0.12);
  border-radius: 2px;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 12px;
  height: 12px;
  border: 2px solid var(--fg);
  border-radius: 50%;
  background: var(--bg);
}

input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border: 2px solid var(--fg);
  border-radius: 50%;
  background: var(--bg);
}

/* —— buttons —— */

.panel-btn {
  width: 100%;
  padding: 0.5rem 0.7rem;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.45);
  color: var(--fg);
  font-size: 0.68rem;
  text-transform: lowercase;
  cursor: pointer;
  transition: background 0.2s var(--glass-ease), border-color 0.2s var(--glass-ease);
}

.panel-btn:hover {
  background: rgba(255, 255, 255, 0.8);
  border-color: rgba(0, 0, 0, 0.2);
}

.panel-btn.is-active {
  background: var(--fg, #111);
  color: #fff;
  border-color: var(--fg, #111);
}

.panel-btn + .panel-btn {
  margin-top: 0.4rem;
}

/* —— mobil: panel wird zum drop-up-sheet —— */

@media (max-width: 760px) {
  /* leinwand volle höhe — wachstum bis zum bildschirmrand (auch unter dem sheet) */
  .text-layer {
    bottom: var(--sheet-h, 40vh);
  }

  .side-panel {
    top: auto;
    left: 0.5rem;
    right: 0.5rem;
    bottom: 0;
    width: auto;
    height: min(46vh, max(36vh, 17.5rem));
    max-height: calc(100vh - 5rem);
    border-bottom: none;
    border-radius: var(--glass-radius) var(--glass-radius) 0 0;
  }

  .panel-content {
    padding-bottom: max(1.1rem, env(safe-area-inset-bottom));
  }
}