#canvas {
  background-color: #f5f5f5;
  border: 1px solid #d8d8d8;
  cursor: crosshair;
  display: block;
  flex-shrink: 0;
}

#control-panel {
  margin-left: 16px;
  min-width: 290px;
  max-height: calc(100vh - 10rem);
  overflow-y: auto;
  overflow-x: hidden;
  align-self: flex-start;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#input-container {
  padding: 14px 16px;
  margin: 5px;
  border: 1px solid #d8d8d8;
  background: #fff;
}

#input-container h1 {
  margin: 0;
  font-size: 30px;
  font-weight: 700;
}

#tool-space {
  padding: 16px;
  margin: 5px;
  border: 1px solid #d8d8d8;
  background: #fff;
}

#gradient-domain-space {
  padding: 16px;
  margin: 5px;
  border: 1px solid #d8d8d8;
  background: #fff;
}

.section-title {
  margin: 14px 6px 6px;
  font-size: 22px;
  font-weight: 600;
}

#gradient-canvas {
  background-color: #f8f8f8;
  border: 1px solid #d8d8d8;
  display: block;
  flex-shrink: 0;
}

#gradient-control-panel {
  margin-left: 16px;
  min-width: 290px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.flex-row-container {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
}

.flex-col-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.tool-button {
  text-align: left;
  padding: 6px 8px;
  border: 1px solid #c8c8c8;
  border-radius: 4px;
  background-color: #fafafa;
  font-size: 13px;
}

.tool-button.active {
  background-color: #ebf3ff;
  border-color: #7fa7e3;
}

#apply-whole-image-button {
  width: 100%;
  padding: 7px 8px;
}

#gradient-blend-button {
  width: 100%;
  padding: 8px;
}

#convolution-preset-select,
#convolution-load-preset-button,
#gradient-load-hand-button,
#gradient-load-ear-button,
#gradient-load-eye-button {
  width: 100%;
  margin-top: 6px;
  padding: 7px 8px;
  font-size: 13px;
  border: 1px solid #c8c8c8;
  border-radius: 4px;
  background: #fafafa;
}

.preset-button-row {
  display: flex;
  gap: 8px;
}

.split-panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.mini-panel {
  border: 1px solid #e6e6e6;
  border-radius: 6px;
  padding: 8px;
  background: #fff;
}

.control-group {
  margin-top: 10px;
}

.control-group.compact {
  margin-top: 6px;
}

.control-hint {
  margin: 6px 0 0;
  font-size: 12px;
  color: #444;
  line-height: 1.35;
}

#custom-kernel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
}

.kernel-input,
#kernel-divisor,
#brush-size,
#gradient-scale,
#gradient-pos-x,
#gradient-pos-y {
  width: 100%;
}

.panel-section {
  border: 1px solid #e2e2e2;
  border-radius: 6px;
  padding: 8px;
  background: #fcfcfc;
}

.panel-section h3 {
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 600;
}

.button-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

label,
p {
  font-size: 13px;
  margin: 0;
}

input[type="file"],
input[type="number"],
select {
  font-size: 13px;
}