:root {
  --gap: 12px;
  --size: 90px;
  --radius: 10px;
  --font: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --border: 1px solid rgba(0, 0, 0, .15);
  --shadow: 0 5px 20px rgba(0, 0, 0, .06);
  --ok: #0f7b0f;
  --bad: #c83532;
  --ink: #111;
  --accent: #0078d4;
  /* Callouts: info boxes on the page (text = dark version of bg hue) */
  --callout-tip-bg: #fefce8;
  --callout-tip-border: #caad00;
  --callout-tip-text: #4a4500;
  --callout-warning-bg: #fff4e0;
  --callout-warning-border: #c77a00;
  --callout-warning-text: #5a3300;
  --callout-info-bg: #e8f4fd;
  --callout-info-border: #0078d4;
  --callout-info-text: #0a3560;
}

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  max-width: 1000px;
  margin: 28px auto;
  padding: 0 28px;
  box-sizing: border-box;
  background: #f7f7f8;
  color: var(--ink);
}

h1 {
  font-size: 1.8rem;
  margin: 0 0 14px;
  font-weight: 600;
}

/* Expandable user guide (README features) */
.features-guide {
  margin: -8px 0 16px;
  color: #444;
  font: 12px/1.4 var(--font);
}
.features-guide-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 16px;
  cursor: pointer;
  list-style: none;
  margin: 0;
  padding: 0;
}
.features-guide-summary::-webkit-details-marker {
  display: none;
}
.features-guide-summary::marker {
  content: '';
}
.features-guide-tagline {
  flex: 1 1 auto;
  min-width: min(100%, 12rem);
}
.features-guide-cta {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}
.features-guide-chevron {
  display: inline-block;
  transition: transform 0.2s ease;
  font-size: 0.65em;
  line-height: 1;
  vertical-align: middle;
  margin-top: -0.05em;
}
.features-guide[open] .features-guide-chevron {
  transform: rotate(90deg);
}
.features-guide-panel {
  margin-top: 12px;
  padding: 16px 18px;
  background: #fafafa;
  border: 1px solid rgba(0, 0, 0, .1);
  border-radius: 10px;
  box-shadow: var(--shadow);
  color: var(--ink);
  font: 13px/1.45 system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
}
.features-guide-title {
  margin: 0 0 10px;
  font: 600 14px/1.3 var(--font);
  color: #333;
}
.features-guide-list {
  margin: 0;
  padding-left: 1.15em;
}
.features-guide-list li {
  margin: 0 0 8px;
}
.features-guide-list li:last-child {
  margin-bottom: 0;
}

.page-section {
  margin-top: 20px;
  padding: 16px 18px;
  background: #fafafa;
  border: 1px solid rgba(0, 0, 0, .1);
  border-radius: 10px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, .06);
}
.page-section h2 {
  margin: 0 0 12px 0;
  font: 600 20px/1.3 var(--font);
  color: #333;
  letter-spacing: .02em;
}

.controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.slider-wrap {
  flex-basis: 100%;
}
.row {
  display: flex;
  gap: var(--gap);
  align-items: flex-start;
  flex-wrap: wrap;
  overflow-x: visible;
  margin-top: 12px;
}
.row-fixed {
  margin-top: 6px;
}
.colour-block {
  margin-top: 18px;
}
.colour-block:first-of-type {
  margin-top: 0;
}
.colour-block-heading {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  margin: 0 0 6px 0;
}
.colour-block-heading input[type="checkbox"].toggle-checkbox {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  margin: 0;
  pointer-events: none;
}
.colour-block-heading .toggle-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1em;
  font-size: 0.75em;
  color: #555;
  flex-shrink: 0;
  line-height: 0;
  transform: translateY(-0.4em);
}
.colour-block-heading .toggle-icon::before {
  content: "\25B6";
  line-height: 1;
}
.colour-block-heading input:checked ~ .toggle-icon::before {
  content: "\25BC";
}
.colour-block-title {
  margin: 0 0 8px 0;
  font: 600 15px/1.3 var(--font);
  color: #555;
}
.optional-content.optional-hidden {
  display: none;
}

.svg-option {
  display: block;
  margin: 0 0 8px 0;
  cursor: pointer;
}
.svg-option input[type="checkbox"] { margin-right: 6px; }

.divergent-null-toggle-wrap {
  margin-bottom: 8px;
}
.divergent-null-label {
  margin: 0;
}

.swatch-wrap {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  position: relative;
}

.swatch-wrap--labeled {
  padding-top: 2px;
}

.swatch-meaning-label {
  display: block;
  font: 600 11px/1.25 var(--font);
  color: #5a5a5a;
  text-align: center;
  max-width: calc(var(--size) + 8px);
  word-break: break-word;
}

.swatch-wrap.active .swatch-input {
  outline: 4px solid var(--accent)
}

.swatch-input {
  width: var(--size);
  height: var(--size);
  border-radius: var(--radius);
  border: var(--border);
  box-shadow: var(--shadow);
  text-align: center;
  font: 700 16px/1 var(--font);
  letter-spacing: .5px;
  text-transform: uppercase;
  color: var(--ink);
  background: #fff;
  outline: none;
  transition: transform .08s, box-shadow .12s, background .1s;
  caret-color: currentColor;
  padding: 4px 4px 18px 4px;
  box-sizing: border-box;
}

.swatch-input:focus {
  transform: translateY(-1px);
  box-shadow: 0 6px 22px rgba(0, 0, 0, .10)
}

.swatch-input.invalid {
  outline: 2px solid #c80000
}

.swatch-contrast {
  position: absolute;
  bottom: 2px;
  left: 2px;
  right: 2px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 0 0 var(--radius) var(--radius);
  font: 10px/1 var(--font);
  font-weight: 600;
  cursor: default;
}
.tooltip {
  position: fixed;
  z-index: 9999;
  padding: 6px 10px;
  font: 12px/1.3 var(--font);
  color: #fff;
  background: #000;
  border: none;
  border-radius: 6px;
  white-space: pre-line;
  pointer-events: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  opacity: 0;
  visibility: hidden;
  transition: none;
}
.tooltip.visible {
  opacity: 1;
  visibility: visible;
}
.swatch-contrast span {
  display: inline-flex;
  align-items: center;
}
.swatch-contrast .pass {
  color: var(--ok);
}
.swatch-contrast .fail {
  color: var(--bad);
}

button,
.import-label {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px
}

button:hover,
.import-label:hover {
  background: #056ab6
}

.actions .btn-action,
.actions .btn-action.import-label {
  font-family: inherit;
  font-size: inherit;
  line-height: 1.25;
  box-sizing: border-box;
  min-height: 40px;
}

.json-preview-label {
  display: block;
  font-size: 0.9em;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}
.preview-panel {
  border: 1px solid rgba(0, 0, 0, .12);
  box-shadow: 0 4px 18px rgba(0, 0, 0, .06);
}
.json-preview-wrap,
.svg-preview-wrap {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
}
.json-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 1;
  padding: 4px 10px;
  font-size: 11px;
  font-family: inherit;
  border: 1px solid rgba(0, 0, 0, .15);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .06);
}
.json-copy-btn:hover {
  background: #f5f5f5;
}
.json-copy-btn:active {
  background: #eee;
}
.json-copy-btn.copied {
  background: #e8f5e9;
  border-color: #4caf50;
}
.json-preview {
  margin: 0;
  padding: 12px 14px;
  font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, monospace;
  font-size: 12px;
  line-height: 1.5;
  background: #fff;
  border-radius: 8px;
  overflow: auto;
  max-height: 280px;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-all;
}
.json-preview .json-key { color: #0560b8; }
.json-preview .json-string { color: #0e6e34; }
.json-preview .json-number { color: #b11a1a; }
.json-preview .json-boolean { color: #7c2699; }
.json-preview .json-null { color: #6b6b6b; }
.json-preview .json-punctuation { color: #5a5a5a; }
.svg-preview {
  padding: 10px;
  background: #fff;
  border-radius: 8px;
  overflow: auto;
  max-height: 280px;
}
.svg-preview svg {
  display: block;
  max-width: 100%;
  height: auto;
}

.btn-secondary {
  background: #fff;
  color: #111;
  border: 1px solid rgba(0, 0, 0, .15)
}
#resetBtn {
  margin-left: auto;
}
#resetBtn:hover {
  background: #c00;
  color: #fff;
  border-color: #a00;
}

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

.hint {
  font: 12px/1.2 var(--font);
  color: #444;
  opacity: .9
}

.storage-warning {
  font: 12px/1.2 var(--font);
  color: #666;
  margin-top: 6px;
}

.theme-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: 12px/1.2 var(--font);
  color: #555;
  flex: 0 0 auto;
  margin-top: 0;
}
.theme-status-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
.theme-status-icon.throbber {
  border: 2px solid rgba(0, 0, 0, .15);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: theme-throbber .7s linear infinite;
}
.theme-status-icon.icon-check {
  color: var(--ok);
  font-weight: 700;
}
.theme-status-icon.icon-warning {
  color: var(--bad);
  font-weight: 700;
}
@keyframes theme-throbber {
  to { transform: rotate(360deg); }
}

.summary {
  margin-top: 10px;
  font: 12px/1.2 var(--font);
  color: #333
}

.page-footer {
  margin-top: 24px;
  padding-top: 12px;
  border-top: 1px solid rgba(0, 0, 0, .1);
  font: 12px/1.4 var(--font);
  color: #666;
}
.page-footer a {
  color: var(--accent);
  text-decoration: none;
}
.page-footer a:hover {
  text-decoration: underline;
}

.callout-tip,
.callout-warning,
.callout-info {
  margin-top: 10px;
  border: 1px solid;
  border-radius: 10px;
  padding: 10px 12px 10px 3.35em;
  font: 12px/1.2 var(--font);
  position: relative;
}
.callout-tip::before,
.callout-warning::before,
.callout-info::before {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.15em;
  line-height: 1;
}
.callout-tip {
  background: var(--callout-tip-bg);
  border-color: var(--callout-tip-border);
  color: var(--callout-tip-text);
}
.callout-tip::before {
  content: "💡";
}
.callout-warning {
  background: var(--callout-warning-bg);
  border-color: var(--callout-warning-border);
  color: var(--callout-warning-text);
}
.callout-warning::before {
  content: "⚠️";
}
.callout-info {
  background: var(--callout-info-bg);
  border-color: var(--callout-info-border);
  color: var(--callout-info-text);
}
.callout-info::before {
  content: "ℹ️";
}

.dropzone.dragover {
  border-color: var(--accent);
  background: #eef6ff
}

.dropzone.fullscreen {
  position: fixed;
  inset: 0;
  margin: 0;
  border-radius: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(247, 247, 248, 0.98);
  z-index: 9999;
  font-size: 14px;
}

.slider-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px
}

.slider-wrap output {
  min-width: 2ch;
  text-align: right;
  font: 600 13px/1 var(--font)
}

.themes-manager {
  flex-basis: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.theme-combo {
  position: relative;
  display: inline-flex;
  align-items: stretch;
}

.theme-combo-input {
  padding: 9px 36px 9px 12px;
  border-radius: 8px 0 0 8px;
  border: 1px solid rgba(0, 0, 0, .15);
  border-right: none;
  background: #fff;
  font: 600 14px/1.2 system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  min-width: 200px;
}

.theme-combo-trigger {
  padding: 0 10px;
  border: 1px solid rgba(0, 0, 0, .15);
  border-left: none;
  border-radius: 0 8px 8px 0;
  background: #f5f5f5;
  cursor: pointer;
  font-size: 10px;
  color: #333;
  display: flex;
  align-items: center;
  justify-content: center;
}
.theme-combo-trigger:hover {
  background: #eee;
}

.theme-combo-list {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin: 2px 0 0;
  padding: 4px 0;
  list-style: none;
  background: #fff;
  border: 1px solid rgba(0, 0, 0, .15);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, .12);
  max-height: 220px;
  overflow-y: auto;
  z-index: 100;
  display: none;
}
.theme-combo-list.open {
  display: block;
}
.theme-combo-list li {
  padding: 8px 12px;
  cursor: pointer;
  font-size: 14px;
}
.theme-combo-list li:hover,
.theme-combo-list li[aria-selected="true"] {
  background: #f0f4ff;
}
.theme-combo-list li.empty {
  color: #888;
  cursor: default;
}

/* ===== Simple Custom Color Picker ===== */
.picker-panel {
  margin-top: 14px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: flex-start;
  background: #fff;
  border-radius: 10px;
  padding: 12px;
}

.picker-btn {
  background: #fff;
  color: #111;
  border: 1px solid rgba(0, 0, 0, .15);
  border-radius: 8px;
  padding: 8px 12px;
  font-weight: 600;
  cursor: pointer
}

.picker-btn.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px #e6f2ff
}

.picker {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: minmax(0, min-content);
  gap: 16px;
  align-items: stretch;
}
.picker-picker-area {
  display: flex;
  gap: 16px;
}
.picker-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.picker-col-inputs {
  min-width: 140px;
}
.picker-col-right {
  min-width: 200px;
  min-height: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-self: stretch;
}
.picker-set-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  flex-shrink: 0;
}
.picker-set-row label {
  font: 600 12px/1.2 var(--font);
  color: #555;
}
.picker-set-select {
  font: 12px/1.2 var(--font);
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid rgba(0, 0, 0, .15);
  background: #fff;
  min-width: 100px;
}
.picker-subsections-wrap {
  flex: 0 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.picker-subsection {
  border: 1px solid rgba(0, 0, 0, .1);
  border-radius: 8px;
  padding: 10px;
  background: #fafafa;
  width: 100%;
  min-width: 0;
  flex: 0 1 auto;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
}
.picker-subsection-hidden {
  display: none;
}
.picker-subsection-title {
  margin: 0 0 8px 0;
  font: 600 13px/1.2 var(--font);
  color: #555;
  flex-shrink: 0;
}

.sv {
  position: relative;
  width: 220px;
  height: 150px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid rgba(0, 0, 0, .15);
  background: red;
  /* replaced dynamically to hue base */
  cursor: crosshair;
}

.sv::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, #fff, rgba(255, 255, 255, 0));
}

.sv::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, #000, rgba(0, 0, 0, 0));
}

.sv-handle {
  position: absolute;
  width: 12px;
  height: 12px;
  margin: -6px 0 0 -6px;
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, .6);
  pointer-events: none;
}

.hue {
  position: relative;
  height: 16px;
  width: 220px;
  border-radius: 999px;
  border: 1px solid rgba(0, 0, 0, .15);
  background: linear-gradient(90deg, red, #ff0, #0f0, #0ff, #00f, #f0f, red);
  cursor: pointer;
}

.hue-handle {
  position: absolute;
  top: 50%;
  width: 12px;
  height: 12px;
  margin-top: -6px;
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, .6);
  pointer-events: none;
  box-sizing: border-box;
}

.picker-hex {
  font: 600 13px/1.2 var(--font);
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid rgba(0, 0, 0, .15);
  width: 10ch;
  min-width: 140px;
  text-transform: uppercase;
}
.picker-input-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.picker-input-row label {
  font: 600 12px/1.2 var(--font);
  color: #444;
  min-width: 2.5em;
}
.picker-input-row input {
  width: 3ch;
  padding: 6px 6px;
  border-radius: 6px;
  border: 1px solid rgba(0, 0, 0, .15);
  font: 600 12px/1.2 var(--font);
  text-align: right;
}

.picker-shades {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.picker-shade {
  border-radius: 8px;
  border: 1px solid rgba(0, 0, 0, .2);
  box-shadow: 0 1px 3px rgba(0, 0, 0, .1);
  cursor: pointer;
  flex-shrink: 0;
  background: #e0e0e0;
}
.picker-shade.narrow {
  width: 28px;
  height: 40px;
}
.picker-shade.center {
  width: 56px;
  height: 56px;
}

.quick-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  width: 100%;
  max-width: 100%;
  min-height: auto;
  flex: 0 1 auto;
  align-self: flex-start;
  align-content: flex-start;
  box-sizing: border-box;
}

.actions {
  margin-top: 16px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.chip {
  width: 22px;
  height: 22px;
  border-radius: 5px;
  border: 1px solid rgba(0, 0, 0, .2);
  cursor: pointer;
}

@media (max-width: 720px) {
  .picker {
    grid-template-columns: 1fr;
    min-width: 0;
  }
  .picker-picker-area {
    flex-direction: column;
    min-width: 0;
  }
  .picker-col-inputs {
    min-width: 0;
  }
  .picker-col-right {
    min-width: 0;
  }
  .picker-col-sv {
    min-width: 0;
  }
  .sv {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
  }
  .hue {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
  }
}

/* —— Toasts (transient top-right messages) —— */
.toast-host {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  max-width: min(360px, calc(100vw - 32px));
  pointer-events: none;
}

.toast {
  pointer-events: none;
  padding: 10px 14px;
  font: 13px/1.4 system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  border-radius: 8px;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateX(12px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.toast--info {
  color: var(--callout-info-text);
  background: var(--callout-info-bg);
  border: 1px solid var(--callout-info-border);
}

.toast--success {
  color: #0d3d0d;
  background: #e8f5e9;
  border: 1px solid #2e7d32;
}

.toast--warning {
  color: var(--callout-warning-text);
  background: var(--callout-warning-bg);
  border: 1px solid var(--callout-warning-border);
}

.toast--critical {
  color: #5c1010;
  background: #fde8e8;
  border: 1px solid #c62828;
}

.toast--visible {
  opacity: 1;
  transform: translateX(0);
}

.toast--exit {
  opacity: 0;
  transform: translateX(8px);
}