@view-transition {
  navigation: auto;
}

html,body,p,ol,ul,li,dl,dt,dd,blockquote,figure,fieldset,legend,textarea,pre,iframe,hr,h1,h2,h3,h4,h5,h6{margin:0;padding:0}h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:normal}ul{list-style:none}button,input,select{margin:0}html{box-sizing:border-box}*,*::before,*::after{box-sizing:inherit}a,button,input,select,textarea,label{-webkit-tap-highlight-color:transparent}img,video,picture{height:auto;max-width:100%}iframe{border:0}table{border-collapse:collapse;border-spacing:0}td,th{padding:0}

:root {
  --header-height: 2rem;
  --padding-x: 3.2rem;
  --bg: #404040;
  --surface: #303030;
  --border: #555;
  --text: #eee;
  --text-dim: #999;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: monospace;
  font-size: 0.85rem;
  overflow-x: hidden;
}

header {
  height: var(--header-height);
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-inline: var(--padding-x);
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

.tagline {
  font-size: 0.75rem;
  color: var(--text-dim);
  opacity: 0.6;
}

main {
  width: min(100%, 100% - 2 * var(--padding-x));
  margin-inline: auto;
  height: calc(100vh - var(--header-height));
  display: flex;
  flex-direction: column;
  align-items: center;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex-shrink: 0;
  width: 100%;
  padding-block: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.controls-row {
  display: flex;
  align-items: center;
  justify-content: center;
}

#drop-zone {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 1rem;
  border: 1px dashed var(--border);
  transition: border-color 0.15s, background 0.15s;
}

#drop-zone.drag-over {
  border-color: var(--text);
  background: var(--surface);
}

.btn-import {
  cursor: pointer;
  padding: 0.35rem 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  letter-spacing: 0.05em;
}

.btn-import:hover {
  border-color: var(--text-dim);
}

input[type="file"] {
  display: none;
}

.controls-ascii {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

.control-cluster {
  display: flex;
  align-items: center;
  padding-inline: 1.25rem;
  border-right: 1px solid var(--border);
  gap: 1rem;
}

.control-cluster:first-child {
  padding-left: 0;
}

.control-cluster:last-child {
  border-right: none;
}

.control-group {
  padding-inline: 1.25rem;
  padding-block: 0.25rem;
  border-right: 1px solid var(--border);
}

.control-cluster .control-group {
  padding-inline: 0;
  border-right: none;
}

.control-group:first-child {
  padding-left: 0;
}

.control-group:last-child {
  border-right: none;
}

@media (max-width: 600px) {
  :root {
    --padding-x: 1rem;
  }

  header {
    padding-inline: 1rem;
    flex-wrap: wrap;
    height: auto;
    padding-block: 0.4rem;
  }

  .tagline {
    display: none;
  }

  main {
    width: min(100%, 100% - 2 * var(--padding-x));
    height: auto;
    min-height: calc(100vh - var(--header-height));
  }

  .controls-ascii {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
  }

  .control-group,
  .control-cluster {
    padding-inline: 0;
    padding-block: 0.4rem;
    border-right: none;
    border-bottom: 1px solid var(--border);
    width: 100%;
  }

  .control-cluster {
    gap: 1rem;
  }

  .control-cluster .control-group {
    border-bottom: none;
    padding-block: 0;
    width: auto;
  }

  .control-group:last-child,
  .control-cluster:last-child {
    border-bottom: none;
  }

  #resolution {
    flex-wrap: wrap;
  }

  #resolution input[type="number"] {
    width: 7ch;
  }

  #canvas-container {
    width: 100%;
  }

}

@media (max-width: 380px) {
  body {
    font-size: 0.72rem;
  }
}

.control-group {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
}


.control-group > label:first-child {
  color: var(--text-dim);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

input[type="checkbox"] {
  appearance: none;
  width: 1.4rem;
  height: 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

input[type="checkbox"]:checked::after {
  content: '✓';
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1;
}

.color-wrap {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

#bg-color-swatch {
  width: 1.4rem;
  height: 1.4rem;
  background: #000;
  border: 1px solid var(--border);
  cursor: pointer;
  flex-shrink: 0;
}

#bg-color-swatch.disabled,
#text-color-swatch.disabled {
  opacity: 0.25;
  cursor: not-allowed;
  pointer-events: none;
}

#text-color-swatch {
  width: 1.4rem;
  height: 1.4rem;
  background: #fff;
  border: 1px solid var(--border);
  cursor: pointer;
  flex-shrink: 0;
}

input[type="color"] {
  display: none;
}

.range-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.font-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hint {
  color: var(--text-dim);
  font-size: 0.75rem;
}

.btn-reset {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 1rem;
  padding: 0;
  line-height: 1;
}

.btn-reset:hover {
  color: var(--text);
}

select {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.25rem 0.4rem;
  font-family: monospace;
  font-size: 0.85rem;
  cursor: pointer;
}

select:focus {
  outline: none;
  border-color: var(--text-dim);
}

#cols-value {
  color: var(--text-dim);
  min-width: 2ch;
}

input[type="text"] {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.25rem 0.4rem;
  font-family: monospace;
  width: 14ch;
}

input:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

#canvas-container {
  flex: 1;
  overflow: auto;
  padding-top: 0.75rem;
}

#resolution {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding-block: 0.5rem;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  color: var(--text-dim);
  font-size: 0.85rem;
}

#resolution input[type="number"] {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.25rem 0.4rem;
  font-family: monospace;
  font-size: 0.85rem;
  width: 15ch;
  text-align: center;
}

#resolution button {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  font-family: monospace;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

#resolution button:hover {
  border-color: var(--text-dim);
}

#export {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  padding-block: 0.75rem;
  padding-inline: 1rem;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

#export button {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.35rem 0.75rem;
  cursor: pointer;
  font-family: monospace;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

#export button:hover {
  border-color: var(--text-dim);
}

#about {
  width: min(100%, 100% - 2 * var(--padding-x));
  margin-inline: auto;
  padding-block: 2rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

#about h1 {
  font-size: 0.85rem;
  color: var(--text);
  font-weight: normal;
}

#about p {
  color: var(--text-dim);
  font-size: 0.8rem;
  line-height: 1.6;
}

canvas {
  display: block;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
}