index.css

:root {
  --input-focus: #2d8cf0;
  --font-color: #323232;
  --font-color-sub: #666;
  --bg-color: beige;
  --main-color: black;
  --page-bg: lightblue;
  --cursor-crosshair: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="%23000000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 5v14M5 12h14"/></svg>') 12 12, crosshair;
  --cursor-eraser: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="%23000000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="m7 21-4.3-4.3c-1-1-1-2.5 0-3.4l9.6-9.6c1-1 2.5-1 3.4 0l5.6 5.6c1 1 1 2.5 0 3.4L13 21"/><path d="M22 21H7"/></svg>') 0 24, auto;
}

[data-theme='dark'] {
  --input-focus: #2d8cf0;
  --font-color: #323232;
  --font-color-sub: #666;
  --bg-color: #fff;
  --main-color: #323232;
  --page-bg: lightgrey;
  --cursor-crosshair: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="%23323232" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 5v14M5 12h14"/></svg>') 12 12, crosshair;
  --cursor-eraser: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="%23323232" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="m7 21-4.3-4.3c-1-1-1-2.5 0-3.4l9.6-9.6c1-1 2.5-1 3.4 0l5.6 5.6c1 1 1 2.5 0 3.4L13 21"/><path d="M22 21H7"/></svg>') 0 24, auto;
}

html {
  color-scheme: light dark;
  background-color: var(--page-bg);
  color: var(--font-color);
  font-family: sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.title {
  color: var(--font-color);
  font-weight: 900;
}

.custom-input {
  height: 40px;
  border-radius: 5px;
  border: 2px solid var(--main-color);
  background-color: var(--bg-color);
  box-shadow: 4px 4px var(--main-color);
  font-size: 15px;
  font-weight: 600;
  color: var(--font-color);
  padding: 5px 10px;
  outline: none;
  transition: all 0.2s ease-in-out;
}

.custom-input::placeholder {
  color: var(--font-color-sub);
  opacity: 0.8;
}

.custom-input:focus {
  border: 2px solid var(--input-focus);
}

.button-log {
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 5px;
  border: 2px solid var(--main-color);
  background-color: var(--bg-color);
  box-shadow: 4px 4px var(--main-color);
  color: var(--font-color);
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.1s ease-in-out;
}

.button-log:active {
  box-shadow: 0px 0px var(--main-color);
  transform: translate(3px, 3px);
}

.canvas-custom {
  border-radius: 5px;
  border: 2px solid var(--main-color) !important;
  background-color: white;
  box-shadow: 4px 4px var(--main-color);
  cursor: var(--cursor-crosshair);
  transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.cursor-eraser {
  cursor: var(--cursor-eraser) !important;
}

.button-log-small {
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 5px;
  border: 2px solid var(--main-color);
  background-color: var(--bg-color);
  box-shadow: 4px 4px var(--main-color);
  color: var(--font-color);
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.1s ease-in-out;
}

.button-log-small:active:not(:disabled) {
  box-shadow: 0px 0px var(--main-color);
  transform: translate(3px, 3px);
}

.button-log-small:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.prompt-input {
  width: 100%;
  height: 52px;
  border-radius: 5px;
  border: 2px solid var(--main-color);
  background-color: var(--bg-color);
  box-shadow: 4px 4px var(--main-color);
  font-size: 1rem;
  font-weight: 600;
  color: var(--font-color);
  padding: 5px 10px;
  padding-right: 60px; /* space for the button */
  outline: none;
  transition: all 0.2s ease-in-out;
}

.prompt-input::placeholder {
  color: var(--font-color-sub);
  opacity: 0.8;
}

.prompt-input:focus {
  border: 2px solid var(--input-focus);
}

.button-confirm {
  cursor: pointer;
  height: 100%;
  width: 48px;
  border-radius: 5px;
  border: none;
  background-color: transparent;
  font-weight: 600;
  color: var(--font-color);
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.1s ease-in-out;
}

.button-confirm:active:not(:disabled) {
  transform: translate(3px, 3px);
}

.button-confirm:disabled {
    color: var(--font-color-sub);
    cursor: not-allowed;
    opacity: 0.5;
}

.modal-content {
  padding: 24px;
  background: var(--bg-color);
  border-radius: 5px;
  border: 2px solid var(--main-color);
  box-shadow: 4px 4px var(--main-color);
  color: var(--font-color);
}

/* Custom Range Slider for Retro Theme */
input[type=range] {
  -webkit-appearance: none;
  width: 100%;
  background: transparent;
}

input[type=range]:focus {
  outline: none;
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 16px;
  width: 16px;
  border: 2px solid var(--main-color);
  border-radius: 50%;
  background: var(--bg-color);
  cursor: pointer;
  margin-top: -6px;
  box-shadow: 1px 1px var(--main-color);
}

input[type=range]::-webkit-slider-runnable-track {
  width: 100%;
  height: 4px;
  cursor: pointer;
  background: var(--main-color);
  border-radius: 2px;
}

input[type=range]::-moz-range-thumb {
  height: 16px;
  width: 16px;
  border: 2px solid var(--main-color);
  border-radius: 50%;
  background: var(--bg-color);
  cursor: pointer;
  box-shadow: 1px 1px var(--main-color);
}

input[type=range]::-moz-range-track {
  width: 100%;
  height: 4px;
  cursor: pointer;
  background: var(--main-color);
  border-radius: 2px;
}