/* Hallmark · pre-emit critique: P5 H5 E4 S5 R5 V4
 * Hallmark · macrostructure: Workbench · tone: Hum warm restraint · anchor hue: persimmon
 * design stamp: Little Orange Beads · static local-first tool · 2026-09-30
 */
:root {
  --color-paper: oklch(96.5% 0.018 83);
  --color-paper-deep: oklch(92.5% 0.028 79);
  --color-surface: oklch(98.2% 0.01 82);
  --color-surface-raised: oklch(99% 0.006 82);
  --color-ink: oklch(30% 0.033 51);
  --color-ink-soft: oklch(48% 0.028 56);
  --color-ink-muted: oklch(48% 0.024 58);
  --color-rule: oklch(84% 0.028 70);
  --color-rule-strong: oklch(72% 0.045 62);
  --color-accent: oklch(65% 0.172 50);
  --color-accent-dark: oklch(53% 0.15 45);
  --color-accent-soft: oklch(90% 0.065 61);
  --color-leaf: oklch(48% 0.085 137);
  --color-leaf-soft: oklch(91% 0.042 132);
  --color-error: oklch(52% 0.17 28);
  --color-focus: oklch(54% 0.155 243);
  --color-shadow: oklch(30% 0.035 54 / 0.1);
  --color-overlay: oklch(28% 0.03 50 / 0.08);
  --color-canvas: oklch(89% 0.025 77);
  --color-grid: oklch(42% 0.018 59 / 0.34);
  --color-transparent-a: oklch(91% 0.011 77);
  --color-transparent-b: oklch(98% 0.006 77);

  --font-display: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: clamp(1.5rem, 2.6vw, 2rem);

  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-pill: 999px;
  --rule-thin: 1px;
  --rule-heavy: 2px;
  --dur-fast: 120ms;
  --dur-base: 180ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: cubic-bezier(0.7, 0, 0.84, 0);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --shadow-panel: 0 0.6rem 1.8rem var(--color-shadow);
}

* {
  box-sizing: border-box;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  padding: 0;
  margin: -1px;
  border: 0;
  clip-path: inset(50%);
  white-space: nowrap;
}

[hidden] {
  display: none !important;
}

html,
body {
  min-width: 0;
  overflow-x: clip;
}

html {
  color-scheme: light;
  background: var(--color-paper);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--color-ink);
  background-color: var(--color-paper);
  font-family: var(--font-body);
  font-size: var(--text-md);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

button,
input,
select,
summary {
  font: inherit;
}

button,
label,
summary,
select,
input[type="range"] {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

svg {
  display: block;
  width: 1.25rem;
  height: 1.25rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

h1,
h2,
h3,
p {
  margin-block-start: 0;
}

h1,
h2,
h3 {
  margin-block-end: 0;
  font-style: normal;
  overflow-wrap: anywhere;
}

h1,
h2 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--text-2xl);
  line-height: 1.2;
}

h2 {
  font-size: var(--text-xl);
  line-height: 1.25;
}

h3 {
  font-size: var(--text-md);
  font-weight: 700;
}

button,
select,
input,
summary,
[tabindex] {
  outline: none;
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  inset: var(--space-3) auto auto var(--space-3);
  z-index: 50;
  padding: var(--space-3) var(--space-4);
  color: var(--color-surface);
  background: var(--color-ink);
  border-radius: var(--radius-sm);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 2rem, 112rem);
  min-height: 5rem;
  margin-inline: auto;
  border-bottom: var(--rule-thin) solid var(--color-rule);
}

.brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  flex: 0 0 auto;
  grid-template-columns: repeat(2, 0.65rem);
  grid-template-rows: repeat(2, 0.65rem);
  gap: 0.12rem;
  padding: 0.2rem;
  transform: rotate(5deg);
}

.brand-mark span {
  background: var(--color-accent);
  border: var(--rule-thin) solid var(--color-accent-dark);
  border-radius: 0.2rem;
}

.brand-mark span:last-child {
  background: var(--color-leaf);
  border-color: var(--color-leaf);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  line-height: 1.25;
}

.brand small {
  margin-top: 0.15rem;
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

.privacy-note {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 2.75rem;
  padding-inline: var(--space-4);
  color: var(--color-leaf);
  background: var(--color-leaf-soft);
  border: var(--rule-thin) solid color-mix(in oklch, var(--color-leaf) 25%, var(--color-leaf-soft));
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: 650;
  white-space: nowrap;
}

.workbench {
  display: grid;
  grid-template-columns: minmax(17.5rem, 20rem) minmax(28rem, 1fr) minmax(17rem, 19rem);
  gap: var(--space-4);
  width: min(100% - 2rem, 112rem);
  min-height: calc(100vh - 8rem);
  margin: var(--space-4) auto var(--space-8);
}

.panel {
  min-width: 0;
  background: var(--color-surface);
  border: var(--rule-thin) solid var(--color-rule);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-panel);
}

.control-panel,
.summary-panel {
  align-self: start;
  padding: var(--space-5);
}

.panel-heading {
  margin-bottom: var(--space-5);
}

.panel-heading > p:last-child {
  margin: var(--space-2) 0 0;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}

.step-label {
  margin-bottom: var(--space-1);
  color: var(--color-accent-dark);
  font-size: var(--text-xs);
  font-weight: 750;
  letter-spacing: 0.1em;
}

.upload-zone {
  display: flex;
  min-height: 9.5rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  color: var(--color-ink-soft);
  background: var(--color-paper);
  border: var(--rule-heavy) dashed var(--color-rule-strong);
  border-radius: var(--radius-md);
  text-align: center;
  transition: background-color var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}

.upload-zone:hover,
.upload-zone.is-dragging {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
}

.upload-zone:active {
  transform: translateY(1px);
}

.upload-zone:focus-within {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.upload-zone input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.upload-zone svg {
  width: 1.75rem;
  height: 1.75rem;
  color: var(--color-accent-dark);
}

.upload-zone strong {
  color: var(--color-ink);
}

.upload-zone span {
  font-size: var(--text-xs);
}

.source-preview {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr) 2.75rem;
  gap: var(--space-3);
  align-items: center;
  min-height: 4.5rem;
  padding: var(--space-2);
  background: var(--color-paper);
  border: var(--rule-thin) solid var(--color-rule);
  border-radius: var(--radius-md);
}

.source-preview[hidden] {
  display: none;
}

.source-preview img {
  width: 3.5rem;
  height: 3.5rem;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.source-preview strong,
.source-preview span {
  display: block;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.source-preview span {
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

.form-section {
  margin: var(--space-5) 0 0;
  padding: 0;
  border: 0;
}

.form-section > label,
.form-section legend,
.field-head label {
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 700;
}

.field-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.field-head output {
  color: var(--color-accent-dark);
  font-size: var(--text-sm);
  font-weight: 750;
}

input[type="range"] {
  width: 100%;
  height: 2.75rem;
  margin: var(--space-1) 0 0;
  cursor: pointer;
  accent-color: var(--color-accent);
}

.range-marks {
  display: flex;
  justify-content: space-between;
  margin-top: calc(var(--space-2) * -1);
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

.segment-control {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-1);
  margin-top: var(--space-2);
  padding: var(--space-1);
  background: var(--color-paper-deep);
  border-radius: var(--radius-md);
}

.segment-control label {
  cursor: pointer;
}

.segment-control input {
  position: absolute;
  opacity: 0;
}

.segment-control span {
  display: grid;
  min-height: 2.75rem;
  place-items: center;
  border: var(--rule-thin) solid transparent;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 700;
}

.segment-control input:checked + span {
  color: var(--color-accent-dark);
  background: var(--color-surface-raised);
  border-color: var(--color-rule);
  box-shadow: 0 0.2rem 0.5rem var(--color-shadow);
}

.segment-control input:focus-visible + span {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

select {
  width: 100%;
  min-height: 2.75rem;
  margin-top: var(--space-2);
  padding: 0 var(--space-10) 0 var(--space-3);
  color: var(--color-ink);
  background-color: var(--color-surface-raised);
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: var(--radius-sm);
}

.field-help {
  margin: var(--space-2) 0 0;
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

.advanced-settings,
.replace-panel {
  margin-top: var(--space-5);
  border-top: var(--rule-thin) solid var(--color-rule);
}

summary {
  display: flex;
  min-height: 2.75rem;
  cursor: pointer;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  font-size: var(--text-sm);
  font-weight: 750;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  width: 0.5rem;
  height: 0.5rem;
  content: "";
  border-right: var(--rule-heavy) solid var(--color-ink-soft);
  border-bottom: var(--rule-heavy) solid var(--color-ink-soft);
  transform: rotate(45deg);
  transition: transform var(--dur-base) var(--ease-out);
}

details[open] > summary::after {
  transform: rotate(225deg);
}

.details-body {
  padding-bottom: var(--space-2);
}

.switch-row {
  display: flex;
  min-height: 3.5rem;
  cursor: pointer;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  border-bottom: var(--rule-thin) solid var(--color-rule);
}

.switch-row strong,
.switch-row small {
  display: block;
}

.switch-row strong {
  font-size: var(--text-sm);
}

.switch-row small {
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

.switch-row input {
  width: 2.7rem;
  height: 1.5rem;
  flex: 0 0 auto;
  cursor: pointer;
  accent-color: var(--color-accent);
}

.nested-control {
  padding: var(--space-3);
  background: var(--color-paper);
  border-bottom: var(--rule-thin) solid var(--color-rule);
}

.primary-button,
.secondary-button,
.icon-button,
.tool-button,
.export-grid button {
  min-height: 2.75rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: transform var(--dur-fast) var(--ease-out), background-color var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}

.primary-button {
  display: flex;
  width: 100%;
  min-height: 3.25rem;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-6);
  color: var(--color-surface-raised);
  background: var(--color-accent-dark);
  border: var(--rule-heavy) solid var(--color-accent-dark);
  font-weight: 750;
  white-space: nowrap;
}

.primary-button:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.primary-button:active,
.secondary-button:active,
.icon-button:active,
.tool-button:active,
.export-grid button:active {
  transform: translateY(1px);
}

.primary-button:disabled,
.secondary-button:disabled,
.icon-button:disabled,
.tool-button:disabled,
.export-grid button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
  transform: none;
}

.primary-button.is-loading svg {
  animation: spin 0.8s linear infinite;
}

.secondary-button {
  min-width: 2.75rem;
  padding-inline: var(--space-4);
  color: var(--color-accent-dark);
  background: var(--color-surface-raised);
  border: var(--rule-thin) solid var(--color-accent);
  font-weight: 700;
  white-space: nowrap;
}

.secondary-button:hover {
  background: var(--color-accent-soft);
}

.icon-button {
  display: grid;
  width: 2.75rem;
  padding: 0;
  place-items: center;
  color: var(--color-ink-soft);
  background: var(--color-surface-raised);
  border: var(--rule-thin) solid var(--color-rule);
}

.icon-button:hover {
  color: var(--color-accent-dark);
  border-color: var(--color-accent);
}

.canvas-panel {
  display: flex;
  min-height: 42rem;
  flex-direction: column;
  overflow: clip;
}

.canvas-header {
  display: flex;
  min-height: 5.75rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  border-bottom: var(--rule-thin) solid var(--color-rule);
}

.canvas-header .step-label {
  margin-bottom: 0;
}

.history-actions {
  display: flex;
  gap: var(--space-2);
}

.tool-row {
  display: flex;
  min-height: 4.25rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-2) var(--space-4);
  background: var(--color-paper);
  border-bottom: var(--rule-thin) solid var(--color-rule);
}

.tool-group {
  display: flex;
  gap: var(--space-1);
}

.tool-button {
  display: flex;
  min-width: 4.6rem;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding-inline: var(--space-3);
  color: var(--color-ink-soft);
  background: transparent;
  border: var(--rule-thin) solid transparent;
  font-size: var(--text-sm);
  font-weight: 700;
  white-space: nowrap;
}

.tool-button:hover {
  background: var(--color-surface);
  border-color: var(--color-rule);
}

.tool-button.is-active {
  color: var(--color-ink);
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
}

.color-well {
  display: grid;
  grid-template-columns: auto minmax(6rem, 9rem) 1.75rem;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
}

.color-well select {
  min-height: 2.75rem;
  margin: 0;
}

.color-well i {
  width: 1.75rem;
  height: 1.75rem;
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: 50%;
  background: var(--color-accent);
}

.canvas-wrap {
  position: relative;
  display: grid;
  min-height: 30rem;
  flex: 1;
  overflow: auto;
  place-items: center;
  padding: var(--space-6);
  background-color: var(--color-canvas);
  overscroll-behavior: contain;
}

.canvas-wrap canvas {
  display: block;
  max-width: none;
  touch-action: none;
  background: var(--color-surface-raised);
  box-shadow: 0 0.6rem 1.5rem var(--color-shadow);
  image-rendering: pixelated;
}

.canvas-wrap canvas[hidden] {
  display: none;
}

.empty-state {
  display: flex;
  max-width: 24rem;
  align-items: center;
  flex-direction: column;
  color: var(--color-ink-soft);
  text-align: center;
}

.empty-state strong {
  margin-top: var(--space-4);
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: var(--text-xl);
}

.empty-state p {
  margin: var(--space-2) 0 var(--space-5);
  font-size: var(--text-sm);
}

.empty-pattern {
  display: grid;
  grid-template-columns: repeat(5, 1.35rem);
  gap: 0.2rem;
  transform: rotate(-3deg);
}

.empty-pattern span {
  width: 1.35rem;
  height: 1.35rem;
  background: var(--color-accent-soft);
  border: var(--rule-thin) solid var(--color-accent);
  border-radius: 0.35rem;
}

.empty-pattern span:nth-child(2),
.empty-pattern span:nth-child(4),
.empty-pattern span:nth-child(7) {
  background: var(--color-accent);
}

.empty-pattern span:nth-child(6) {
  grid-column: 2;
  background: var(--color-leaf);
  border-color: var(--color-leaf);
}

.view-bar {
  display: flex;
  min-height: 3.5rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-1) var(--space-4);
  background: var(--color-paper);
  border-top: var(--rule-thin) solid var(--color-rule);
  border-bottom: var(--rule-thin) solid var(--color-rule);
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

.view-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.view-options label {
  display: flex;
  min-height: 2.75rem;
  cursor: pointer;
  align-items: center;
  gap: var(--space-2);
  padding-inline: var(--space-2);
}

.view-options input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--color-accent);
}

.replace-panel {
  margin: 0;
  padding-inline: var(--space-4);
  border-top: 0;
}

.replace-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto;
  gap: var(--space-3);
  align-items: end;
  padding: 0 0 var(--space-4);
  font-size: var(--text-sm);
}

.replace-controls label {
  min-width: 0;
}

.replace-controls select {
  margin-top: var(--space-1);
}

.summary-panel {
  display: flex;
  flex-direction: column;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
}

.metric-grid > div {
  min-width: 0;
  padding: var(--space-3);
  background: var(--color-paper);
  border: var(--rule-thin) solid var(--color-rule);
  border-radius: var(--radius-sm);
}

.metric-grid span,
.metric-grid strong {
  display: block;
}

.metric-grid span {
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

.metric-grid strong {
  margin-top: var(--space-1);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  line-height: 1.2;
  overflow-wrap: anywhere;
}

.color-list-wrap,
.export-section {
  margin-top: var(--space-6);
}

.list-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.list-head span {
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

.color-list {
  max-height: 18rem;
  overflow: auto;
  border-top: var(--rule-thin) solid var(--color-rule);
}

.color-item {
  display: grid;
  grid-template-columns: 1.65rem minmax(0, 1fr) auto;
  gap: var(--space-2);
  align-items: center;
  min-height: 3.25rem;
  border-bottom: var(--rule-thin) solid var(--color-rule);
}

.color-item-swatch {
  width: 1.5rem;
  height: 1.5rem;
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: 50%;
}

.color-item strong,
.color-item small {
  display: block;
}

.color-item strong {
  font-size: var(--text-sm);
}

.color-item small {
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

.color-item-count {
  text-align: right;
}

.color-item-count strong {
  color: var(--color-accent-dark);
}

.muted-empty {
  margin: var(--space-6) 0;
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
  text-align: center;
}

.export-section h3 {
  margin-bottom: var(--space-2);
}

.export-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
}

.export-grid button {
  display: flex;
  min-width: 0;
  min-height: 3.4rem;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  color: var(--color-ink-soft);
  background: var(--color-surface-raised);
  border: var(--rule-thin) solid var(--color-rule);
  font-size: var(--text-xs);
  font-weight: 700;
  white-space: nowrap;
}

.export-grid button:hover:not(:disabled) {
  color: var(--color-ink);
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
}

.autosave-status {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  margin: var(--space-6) 0 0;
  padding-top: var(--space-4);
  color: var(--color-leaf);
  border-top: var(--rule-thin) solid var(--color-rule);
  font-size: var(--text-xs);
}

.autosave-status svg {
  flex: 0 0 auto;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: var(--space-6);
  width: min(100% - 2rem, 112rem);
  margin: 0 auto;
  padding: var(--space-6) 0 var(--space-8);
  color: var(--color-ink-muted);
  border-top: var(--rule-thin) solid var(--color-rule);
  font-size: var(--text-xs);
}

.site-footer p {
  margin: 0;
}

.site-footer p:first-child {
  color: var(--color-ink-soft);
  font-family: var(--font-display);
  font-weight: 700;
}

.site-footer a {
  color: inherit;
  text-underline-offset: 0.2em;
}

.seo-guide {
  width: min(100% - 2rem, 90rem);
  margin: var(--space-8) auto 0;
}

.seo-guide-inner {
  padding: clamp(1.5rem, 4vw, 3rem);
  background: var(--color-surface);
  border: var(--rule-thin) solid var(--color-rule);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-panel);
}

.seo-guide h2 {
  margin: var(--space-1) 0 var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  line-height: 1.2;
}

.seo-guide-inner > p:not(.step-label) {
  max-width: 62rem;
  margin: 0;
  color: var(--color-ink-soft);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.guide-grid article {
  padding: var(--space-5);
  background: var(--color-paper);
  border: var(--rule-thin) solid var(--color-rule);
  border-radius: var(--radius-md);
}

.guide-grid h3,
.faq-list h2 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-display);
}

.guide-grid h3 {
  font-size: var(--text-lg);
}

.guide-grid p,
.faq-list p {
  margin: 0;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}

.faq-list {
  margin-top: var(--space-8);
}

.faq-list h2 {
  font-size: var(--text-xl);
}

.faq-list details {
  padding-block: var(--space-3);
  border-top: var(--rule-thin) solid var(--color-rule);
}

.faq-list summary {
  color: var(--color-ink);
  cursor: pointer;
  font-weight: 750;
}

.faq-list p {
  padding-top: var(--space-2);
}

.toast {
  position: fixed;
  right: var(--space-4);
  bottom: var(--space-4);
  z-index: 40;
  max-width: min(24rem, calc(100% - 2rem));
  padding: var(--space-3) var(--space-4);
  color: var(--color-surface-raised);
  background: var(--color-ink);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-panel);
  font-size: var(--text-sm);
}

.toast[hidden] {
  display: none;
}

@keyframes spin {
  to {
    transform: rotate(1turn);
  }
}

@media (max-width: 74rem) {
  .workbench {
    grid-template-columns: minmax(17rem, 19rem) minmax(0, 1fr);
  }

  .summary-panel {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.1fr) minmax(0, 1fr);
    gap: var(--space-6);
  }

  .summary-panel .panel-heading,
  .summary-panel .autosave-status {
    grid-column: 1 / -1;
  }

  .color-list-wrap,
  .export-section {
    margin-top: 0;
  }
}

@media (max-width: 52rem) {
  .site-header {
    width: min(100% - 1.5rem, 100%);
  }

  .workbench {
    grid-template-columns: minmax(0, 1fr);
    width: min(100% - 1.5rem, 100%);
  }

  .control-panel,
  .summary-panel {
    padding: var(--space-4);
  }

  .control-panel {
    order: 1;
  }

  .canvas-panel {
    order: 2;
    min-height: 35rem;
  }

  .summary-panel {
    order: 3;
    display: flex;
  }

  .summary-panel .panel-heading,
  .summary-panel .autosave-status {
    grid-column: auto;
  }

  .color-list-wrap,
  .export-section {
    margin-top: var(--space-6);
  }

  .canvas-wrap {
    min-height: 24rem;
    padding: var(--space-3);
  }

  .site-footer {
    width: min(100% - 1.5rem, 100%);
  }

  .seo-guide {
    width: min(100% - 1.5rem, 100%);
  }

  .guide-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 38rem) {
  .site-header {
    min-height: 4.5rem;
  }

  .brand small {
    display: none;
  }

  .privacy-note {
    width: 2.75rem;
    padding: 0;
    justify-content: center;
  }

  .privacy-note span {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
  }

  .workbench {
    gap: var(--space-3);
    margin-top: var(--space-3);
  }

  .panel {
    border-radius: var(--radius-md);
  }

  .canvas-header {
    min-height: 4.75rem;
    padding: var(--space-3);
  }

  .tool-row {
    align-items: stretch;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-2);
  }

  .tool-group {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .tool-button {
    min-width: 0;
    padding-inline: var(--space-2);
  }

  .color-well {
    grid-template-columns: auto minmax(0, 1fr) 1.75rem;
    min-height: 2.75rem;
    padding-inline: var(--space-2);
  }

  .canvas-wrap {
    min-height: 22rem;
    padding: var(--space-2);
  }

  .view-bar {
    align-items: flex-start;
    flex-direction: column;
    padding: var(--space-2);
  }

  .view-options {
    width: 100%;
    justify-content: space-between;
  }

  .replace-controls {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .replace-controls > span {
    display: none;
  }

  .replace-controls .secondary-button {
    grid-column: 1 / -1;
  }

  .site-footer {
    flex-direction: column;
    gap: var(--space-2);
  }
}

@media (max-width: 22rem) {
  .site-header,
  .workbench,
  .seo-guide,
  .site-footer {
    width: min(100% - 1rem, 100%);
  }

  .control-panel,
  .summary-panel {
    padding: var(--space-3);
  }

  .segment-control {
    gap: 0.12rem;
  }

  .tool-button {
    flex-direction: column;
    gap: 0;
    font-size: var(--text-xs);
  }

  .metric-grid,
  .export-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .replace-controls {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media print {
  :root {
    --color-paper: oklch(98% 0.004 80);
    --color-surface: oklch(98% 0.004 80);
  }

  .site-header,
  .control-panel,
  .summary-panel,
  .canvas-header,
  .tool-row,
  .view-bar,
  .replace-panel,
  .site-footer,
  .toast {
    display: none !important;
  }

  .workbench {
    display: block;
    width: 100%;
    min-height: 0;
    margin: 0;
  }

  .canvas-panel {
    min-height: 0;
    border: 0;
    box-shadow: none;
  }

  .canvas-wrap {
    min-height: 0;
    overflow: visible;
    padding: 0;
    background: var(--color-surface);
  }

  .canvas-wrap canvas {
    max-width: 100%;
    max-height: 95vh;
    box-shadow: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}