:root {
  --bg: #ffffff;
  --fg: #000000;
  --muted: #666666;
  --line: #000000;
  --hair: rgba(0, 0, 0, 0.16);
  --hover: #ededed;
  --panel-w: 17.5rem;
  --top-h: 3rem;
  --font-display: "Astloch", Georgia, "Times New Roman", serif;
  --font-ui: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --ui-weight: 600;
  --ui-weight-strong: 700;
  --ui-tracking: 0.035em;
  --seed-font: var(--font-display);
  --radius: 2px;
  --ease: cubic-bezier(0.2, 0, 0, 1);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

@font-face {
  font-family: "Astloch";
  src: url("../fonts/Astloch-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Astloch";
  src: url("../fonts/Astloch-Bold.ttf") format("truetype");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

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

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

button,
input {
  font: inherit;
  color: inherit;
}

/* ============================================================
   TOPBAR — brand · modi · info (flach, solide)
   ============================================================ */

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  height: calc(var(--top-h) + var(--safe-top));
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--safe-top) 0.7rem 0;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-family: var(--font-display);
  font-size: 1.38rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  white-space: nowrap;
}

.nav {
  position: absolute;
  /* zentriert über dem canvas-bereich (viewport minus panel), nicht der ganzen topbar */
  left: calc(50% - var(--panel-w) / 2);
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg);
  text-transform: none;
}

.nav-tab {
  padding: 0.34rem 1rem;
  border: none;
  border-left: 1px solid var(--line);
  background: var(--bg);
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: var(--ui-weight-strong);
  letter-spacing: var(--ui-tracking);
  text-transform: none;
  cursor: pointer;
  transition: background 0.15s var(--ease), color 0.15s var(--ease);
}

.nav-tab:first-child {
  border-left: none;
}

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

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

.info-btn {
  width: 1.65rem;
  height: 1.65rem;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: var(--ui-weight-strong);
  font-style: italic;
  letter-spacing: var(--ui-tracking);
  line-height: 1;
  text-transform: none;
  cursor: pointer;
  box-shadow: 2px 2px 0 var(--fg);
  transition: transform 0.08s var(--ease), box-shadow 0.08s var(--ease), background 0.15s var(--ease);
}

.info-btn:hover {
  background: var(--hover);
}

.info-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 0 0 0 var(--fg);
}

/* ============================================================
   LEINWAND — nur der freie bereich links vom panel
   ============================================================ */

.stage {
  position: fixed;
  top: calc(var(--top-h) + var(--safe-top));
  left: 0;
  right: var(--panel-w);
  bottom: 0;
  z-index: 5;
  background: var(--bg);
  overflow: hidden;
}

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

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

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

body.is-border.ctx-flat .stage canvas {
  cursor: crosshair;
}

body.ctx-3d .stage canvas {
  cursor: crosshair;
}

/* ============================================================
   TEXTEINGABE (mitte der leinwand)
   ============================================================ */

.text-layer {
  position: fixed;
  top: calc(var(--top-h) + var(--safe-top));
  left: 0;
  right: var(--panel-w);
  bottom: 0;
  z-index: 10;
  display: none;
  pointer-events: none;
}

body.is-text.ctx-flat .text-layer {
  display: block;
}

body:not(.entered) .text-layer {
  display: none;
}

.seed-editor {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.seed-line {
  position: relative;
  display: inline-block;
  max-width: 95%;
  pointer-events: none;
}

.seed-sizer,
.seed-measure-before {
  position: absolute;
  left: -9999px;
  top: 0;
  visibility: hidden;
  white-space: pre;
  font-weight: 700;
  font-family: var(--seed-font);
  line-height: 1.2;
  letter-spacing: 0;
  text-transform: lowercase;
  pointer-events: none;
}

.seed-hint {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui);
  font-size: 1.7rem;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-transform: none;
  text-align: center;
  white-space: pre;
  color: #cfcfcf;
  pointer-events: none;
  user-select: none;
}

.seed-hint[hidden] {
  display: none;
}

.seed-input {
  position: relative;
  z-index: 1;
  display: block;
  min-width: 1ch;
  max-width: 95%;
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
  color: transparent;
  font-weight: 700;
  font-family: var(--seed-font);
  line-height: 1.2;
  letter-spacing: 0;
  text-align: center;
  text-transform: lowercase;
  outline: none;
  pointer-events: auto;
  caret-color: transparent;
  touch-action: manipulation;
}

.seed-caret {
  position: absolute;
  top: 50%;
  left: 0;
  z-index: 2;
  transform: translateY(-50%);
  background: var(--fg);
  pointer-events: none;
  animation: seed-caret-blink 1.05s step-end infinite;
}

.seed-caret.is-off {
  opacity: 0;
  animation: none;
}

@keyframes seed-caret-blink {
  0%,
  49% {
    opacity: 1;
  }

  50%,
  100% {
    opacity: 0;
  }
}

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

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

/* ============================================================
   RECHTES PANEL — solide, flach, mit klarer kante
   ============================================================ */

.side-panel {
  position: fixed;
  top: calc(var(--top-h) + var(--safe-top));
  right: 0;
  bottom: 0;
  z-index: 40;
  width: var(--panel-w);
  background: var(--bg);
  border-left: 1px solid var(--line);
  overflow: hidden;
  font-family: var(--font-ui);
  font-weight: var(--ui-weight);
  letter-spacing: var(--ui-tracking);
  text-transform: none;
}

.panel-content {
  height: 100%;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 0.7rem 0.65rem 0.8rem;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.panel-block {
  flex: 0 0 auto;
  margin-bottom: 0.8rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--hair);
}

.panel-block--params {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 0.7rem;
  row-gap: 0.15rem;
  align-content: start;
}

.panel-block--params > .panel-label,
.panel-block--params > .force-control,
.panel-block--params > .params-stack,
.panel-block--params > .ctl-3d-params,
.panel-block--params > .node-stats,
.panel-block--params > .ctl-stroke,
.panel-block--params > .ctl-node-limit {
  grid-column: 1 / -1;
}

.ctl-3d-params {
  display: none;
}

body.ctx-3d .ctl-3d-params {
  display: flex;
}

.panel-block:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.panel-label {
  display: block;
  width: 100%;
  margin: 0 0 0.65rem;
  padding: 0.42rem 0.68rem;
  background: var(--fg);
  color: var(--bg);
  font-family: var(--font-display);
  font-size: 1.14rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.15;
  text-transform: lowercase;
}

.force-control {
  margin-bottom: 0.62rem;
}

.force-control .control-head {
  justify-content: space-between;
}

.force-title {
  color: var(--muted);
}

.force-ends {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  margin-top: 0.2rem;
}

.force-end {
  font-size: 0.72rem;
  font-weight: var(--ui-weight-strong);
  line-height: 1.2;
  color: var(--muted);
  letter-spacing: var(--ui-tracking);
  transition: color 0.15s var(--ease);
}

.force-end.is-active {
  color: var(--fg);
}

.params-stack {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 0.62rem;
}

.params-stack .control {
  margin-bottom: 0.62rem;
}

.params-stack .control:last-child {
  margin-bottom: 0;
}

/* —— regler —— */

.control {
  display: block;
  margin-bottom: 0.62rem;
}

.control:last-child {
  margin-bottom: 0;
}

.control-head {
  display: flex;
  justify-content: space-between;
  gap: 0.45rem;
  margin-bottom: 0.28rem;
  font-size: 0.76rem;
  font-weight: var(--ui-weight-strong);
  color: var(--muted);
}

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

.node-stats {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.45rem;
  margin: -0.15rem 0 0.35rem;
  font-size: 0.76rem;
  font-weight: var(--ui-weight-strong);
}

.node-stats-label {
  color: var(--muted);
  letter-spacing: var(--ui-tracking);
}

input[type="range"] {
  width: 100%;
  height: 2px;
  margin: 0.22rem 0;
  appearance: none;
  -webkit-appearance: none;
  background: var(--fg);
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  border: 1px solid var(--fg);
  border-radius: 0;
  background: var(--bg);
}

input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border: 1px solid var(--fg);
  border-radius: 0;
  background: var(--bg);
}

/* stroke nur flach verstecken: nicht mehr — auch in 3d sichtbar */
body.ctx-3d .ctl-flat {
  display: none;
}

.ctl-border {
  display: none;
}

body.is-border.ctx-flat .ctl-border {
  display: block;
}

.border-pf-label {
  margin: 0.45rem 0 0.28rem;
  font-family: var(--font-ui);
  font-size: 0.68rem;
  font-weight: var(--ui-weight-strong);
  letter-spacing: var(--ui-tracking);
  text-transform: lowercase;
  color: var(--muted);
}

.border-pf-grid {
  grid-template-columns: 1fr 1fr;
}

.border-tool-grid {
  grid-template-columns: 1fr 1fr;
}

.border-icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 2.35rem;
  padding: 0.4rem 0.35rem;
}

.border-tool-icon {
  width: 1.15rem;
  height: 1.15rem;
  display: block;
  pointer-events: none;
}

.panel-btn.is-active .border-tool-icon {
  color: inherit;
}

body.is-border[data-border-tool="paint"] .border-pf-grid,
body.is-border[data-border-tool="paint"] .border-pf-label {
  opacity: 0.38;
  pointer-events: none;
}

.ctl-link,
.ctl-tumble {
  display: none;
}

body.ctx-3d .ctl-link,
body.ctx-3d .ctl-tumble {
  display: block;
}

/* —— buttons —— */

.btn-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem;
}

.btn-wide {
  grid-column: 1 / -1;
}

.panel-btn {
  width: 100%;
  padding: 0.46rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--fg);
  font-size: 0.76rem;
  font-weight: var(--ui-weight-strong);
  letter-spacing: var(--ui-tracking);
  cursor: pointer;
  box-shadow: 2px 2px 0 var(--fg);
  transition: transform 0.08s var(--ease), box-shadow 0.08s var(--ease), background 0.15s var(--ease);
}

.panel-btn:hover {
  background: var(--hover);
}

.panel-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 0 0 0 var(--fg);
}

.panel-btn.is-active {
  background: var(--fg);
  color: var(--bg);
  box-shadow: 0 0 0 var(--fg);
  transform: translate(2px, 2px);
}

/* ============================================================
   INFO-FENSTER (klassisches ui-fenster)
   ============================================================ */

.modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.25);
}

.modal[hidden] {
  display: none;
}

.modal-window {
  width: min(46rem, 94vw);
  max-height: none;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 6px 6px 0 var(--fg);
}

.modal-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.65rem 0.65rem 1rem;
  background: var(--fg);
  color: var(--bg);
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: lowercase;
}

.modal-close {
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--bg);
  border-radius: var(--radius);
  background: var(--fg);
  color: var(--bg);
  font-family: var(--font-ui);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
}

.modal-close:hover {
  background: var(--bg);
  color: var(--fg);
}

.modal-body {
  padding: 1.35rem 1.45rem 1.55rem;
  overflow: visible;
  font-family: var(--font-ui);
  font-size: 0.98rem;
  font-weight: var(--ui-weight);
  letter-spacing: var(--ui-tracking);
  line-height: 1.72;
  text-transform: none;
}

.modal-body p {
  margin: 0 0 0.95rem;
}

.modal-body p:last-child {
  margin-bottom: 0;
}

.modal-body code {
  padding: 0.02rem 0.25rem;
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  background: var(--hover);
  font-family: var(--font-ui);
}

.modal-body a {
  color: var(--fg);
  font-weight: var(--ui-weight-strong);
  text-decoration: underline;
  text-underline-offset: 0.14em;
}

.modal-body a:hover {
  color: var(--muted);
}

.modal-sources {
  margin-top: 0.15rem;
  margin-bottom: 0.2rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--hair);
  font-size: 0.92rem;
  line-height: 1.45;
}

.modal-links {
  margin: 0;
  padding-left: 1.05rem;
  line-height: 1.45;
  font-size: 0.88rem;
}

.modal-links li {
  margin-bottom: 0.4rem;
}

.modal-links li:last-child {
  margin-bottom: 0;
}

.modal-legacy {
  margin: 0;
  padding: 1.5rem 0 0 1.05rem;
  font-size: 0.62rem;
  letter-spacing: 0.05em;
}

.modal-legacy a {
  color: var(--muted);
  text-decoration: none;
  opacity: 0.2;
  transition: opacity 0.2s ease;
}

.modal-legacy a:hover,
.modal-legacy a:focus-visible {
  opacity: 0.55;
  text-decoration: underline;
  text-underline-offset: 0.14em;
}

.modal-credit {
  margin: 0.85rem 0 0.15rem;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--fg);
  opacity: 0.55;
}

.modal-params-box {
  margin: 0.1rem 0 1rem;
  padding: 0.55rem 0.65rem 0.6rem;
  background: #f2f2f2;
  border: 1px solid var(--hair);
  border-radius: var(--radius);
}

.modal-params-label {
  margin: 0 0 0.35rem;
  font-size: 0.68rem;
  font-weight: var(--ui-weight-strong);
  letter-spacing: 0.06em;
  text-transform: lowercase;
  color: var(--muted);
}

.modal-params-compact {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
  line-height: 1.38;
}

.modal-params-compact li {
  display: grid;
  grid-template-columns: 8.4rem 1fr;
  column-gap: 0.55rem;
  align-items: baseline;
  margin-bottom: 0.22rem;
}

.modal-params-compact li:last-child {
  margin-bottom: 0;
}

.modal-param-term {
  flex-shrink: 0;
  white-space: nowrap;
}

.modal-param-term b {
  font-weight: var(--ui-weight-strong);
  font-size: 0.78rem;
  letter-spacing: 0.015em;
}

.modal-param-desc {
  min-width: 0;
  color: var(--fg);
}

.modal-tag {
  display: inline-block;
  margin: 0 0.08rem;
  padding: 0.02rem 0.28rem;
  font-size: 0.62rem;
  font-weight: var(--ui-weight-strong);
  color: var(--muted);
  letter-spacing: 0.05em;
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  background: var(--bg);
  vertical-align: baseline;
}

/* ============================================================
   INTRO — etwas wächst, dann zoomt es rein
   ============================================================ */

.intro {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  background: var(--bg);
  overflow: visible;
}

.intro[hidden] {
  display: none;
}

.intro-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.intro-zoom-target {
  transform-origin: center center;
  will-change: transform;
  overflow: visible;
}

.intro-canvas-host {
  width: min(340px, 72vw);
  height: min(340px, 72vw);
  background: transparent;
  overflow: visible;
}

.intro-canvas-host canvas {
  display: block;
  width: min(340px, 72vw) !important;
  height: min(340px, 72vw) !important;
  background: transparent !important;
  image-rendering: auto;
}

.intro-word {
  margin: 0;
  padding: 0;
  border: none;
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 13vw, 6.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  text-align: center;
}

/* übergang: intro fährt nach oben weg, app liegt darunter */
.intro.leaving {
  pointer-events: none;
  animation: introSlideUp 0.65s var(--ease) forwards;
}

@keyframes introSlideUp {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-100%);
  }
}

/* app ist sichtbar, sobald entered gesetzt wird — kein einblenden */
body.entered .topbar,
body.entered .side-panel,
body.entered .stage {
  animation: none;
}

@media (prefers-reduced-motion: reduce) {
  .intro.leaving {
    animation: none;
    transform: translateY(-100%);
  }

  body.entered .topbar,
  body.entered .side-panel,
  body.entered .stage {
    animation: none;
    transition: none;
  }
}

/* ============================================================
   MOBIL — panel als unteres feld
   ============================================================ */

@media (max-width: 760px) {
  :root {
    --panel-w: 0px;
    --top-h: 2.9rem;
  }

  .stage,
  .text-layer {
    right: 0;
    bottom: var(--sheet-h, 42dvh);
  }

  .seed-hint {
    font-size: clamp(1rem, 4.5vw, 1.35rem);
  }

  .seed-line {
    max-width: 92%;
  }

  .brand {
    font-size: 0.95rem;
    max-width: 34vw;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .nav-tab {
    padding: 0.24rem 0.5rem;
    font-size: 0.72rem;
  }

  .side-panel {
    top: auto;
    left: 0;
    right: 0;
    bottom: 0;
    width: auto;
    height: min(46dvh, calc(100dvh - var(--top-h) - var(--safe-top) - 0.8rem));
    max-height: none;
    border-left: none;
    border-top: 1px solid var(--line);
  }

  .panel-content {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
    padding-bottom: max(0.55rem, var(--safe-bottom));
  }

  .panel-block--params {
    grid-template-columns: 1fr 1fr;
  }

  .modal {
    padding: 0.65rem;
  }

  .modal-window {
    width: min(100%, 96vw);
    max-height: none;
    box-shadow: 4px 4px 0 var(--fg);
  }

  .modal-title {
    font-size: 1.08rem;
    padding: 0.5rem 0.55rem 0.5rem 0.75rem;
  }

  .modal-body {
    padding: 0.9rem 0.9rem 1rem;
    font-size: 0.88rem;
    line-height: 1.6;
  }
}

@media (max-width: 560px) {
  .topbar {
    padding-right: 0.45rem;
    padding-left: 0.45rem;
  }

  .nav {
    left: 50%;
    max-width: calc(100vw - 6rem);
  }

  .nav-tab {
    padding: 0.23rem 0.32rem;
    font-size: 0.66rem;
  }
}

@media (max-height: 760px) {
  .panel-label {
    font-size: 0.92rem;
    margin-bottom: 0.3rem;
    padding: 0.28rem 0.5rem;
  }

  .panel-block {
    margin-bottom: 0.32rem;
    padding-bottom: 0.32rem;
  }

  .control {
    margin-bottom: 0.3rem;
  }

  .panel-btn {
    padding: 0.32rem 0.4rem;
    font-size: 0.68rem;
  }
}

/* performance-hinweis bei automatischem stopp */
.perf-toast {
  position: fixed;
  left: 50%;
  bottom: max(1.1rem, var(--safe-bottom));
  transform: translateX(-50%) translateY(0.65rem);
  z-index: 55;
  max-width: min(30rem, calc(100vw - 2rem));
  padding: 0.58rem 0.9rem;
  background: var(--fg);
  color: var(--bg);
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: var(--ui-weight);
  letter-spacing: var(--ui-tracking);
  text-transform: lowercase;
  border-radius: var(--radius);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}

.perf-toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 900px) {
  .perf-toast {
    bottom: calc(min(46dvh, calc(100dvh - var(--top-h) - var(--safe-top) - 0.8rem)) + max(0.85rem, var(--safe-bottom)));
  }
}