:root {
  --tool-blue: #163f63;
  --tool-blue-dark: #0f2f4a;
  --tool-teal: #2d718f;
  --tool-focus: #b76f00;
  --tool-panel: #ffffff;
  --tool-shadow: 0 18px 50px rgba(23, 37, 51, 0.09);
}

.tool-header {
  min-height: 4.75rem;
}

.tool-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.tool-nav a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  padding: 0.5rem 0.8rem;
  color: var(--color-muted);
  border-radius: 0.3rem;
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
}

.tool-nav a:hover {
  color: var(--tool-blue);
  background: var(--color-soft);
}

.palette-main {
  width: min(100% - 3rem, 1160px);
}

.eyebrow {
  margin: 0 0 0.55rem;
  color: var(--tool-teal);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.tool-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
}

.tool-heading > div {
  min-width: 0;
  flex: 1 1 auto;
}

.tool-heading h1 {
  width: min(100%, 620px);
}

.privacy-note {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.6rem;
  color: #3d6154;
  font-size: 0.83rem;
  font-weight: 650;
}

.privacy-note span {
  color: #2f8a65;
  font-size: 0.7rem;
}

.palette-workspace {
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.28fr);
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.palette-panel {
  min-width: 0;
  padding: clamp(1.2rem, 2.5vw, 1.7rem);
  border: 1px solid var(--color-line);
  border-radius: 0.55rem;
  background: var(--tool-panel);
  box-shadow: var(--tool-shadow);
}

.panel-heading {
  display: flex;
  min-height: 2.25rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.panel-heading h2 {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 1.05rem;
}

.palette-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.control-wide {
  grid-column: 1 / -1;
}

.control-field {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 0.4rem;
  color: #344555;
  font-size: 0.78rem;
  font-weight: 700;
}

.control-field select,
.control-field input[type="text"] {
  width: 100%;
  min-height: 2.7rem;
  padding: 0.48rem 0.65rem;
  color: var(--color-ink);
  border: 1px solid #c3cdd5;
  border-radius: 0.3rem;
  background: #fff;
  font: inherit;
  font-weight: 500;
}

.range-control {
  display: flex;
  min-height: 2.7rem;
  align-items: center;
  gap: 0.7rem;
}

.range-control input {
  min-width: 0;
  flex: 1;
  accent-color: var(--tool-blue);
}

.range-control output {
  min-width: 1.7rem;
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.checkbox-field {
  min-height: 2.7rem;
  flex-direction: row;
  align-items: center;
  align-self: end;
}

.checkbox-field input {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--tool-blue);
}

.palette-guidance {
  margin-top: 1.4rem;
  padding: 1rem;
  border: 1px solid #dce4e9;
  border-radius: 0.35rem;
  background: #f7f9fa;
}

.palette-guidance p {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.55;
}

.palette-guidance .palette-kind {
  margin-bottom: 0.3rem;
  color: var(--tool-blue);
  font-weight: 750;
  letter-spacing: 0.03em;
}

.palette-preview {
  padding: 1.25rem;
  border: 1px solid #d5dde2;
  border-radius: 0.4rem;
  background: #f3f6f8;
  transition: background-color 120ms ease;
}

.palette-preview[data-background="dark"] {
  background: #172533;
}

.gradient-bar {
  min-height: 5.5rem;
  border-radius: 0.32rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18);
}

.plot-preview {
  display: flex;
  height: 7rem;
  align-items: end;
  justify-content: center;
  gap: clamp(0.3rem, 1.5vw, 0.8rem);
  margin-top: 1.25rem;
  padding: 0 0.5rem;
  border-bottom: 1px solid rgba(88, 102, 116, 0.45);
}

.plot-bar {
  width: min(9%, 2.8rem);
  min-width: 0.65rem;
  border-radius: 0.2rem 0.2rem 0 0;
}

.swatch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(84px, 1fr));
  gap: 0.55rem;
  margin-top: 1rem;
}

.swatch-button {
  min-width: 0;
  padding: 0;
  overflow: hidden;
  color: var(--color-ink);
  border: 1px solid #ccd6dc;
  border-radius: 0.32rem;
  background: #fff;
  font: inherit;
  cursor: pointer;
}

.swatch-button:hover {
  border-color: #748e9f;
  box-shadow: 0 3px 12px rgba(23, 37, 51, 0.12);
}

.swatch-colour {
  display: block;
  min-height: 3.2rem;
}

.swatch-label {
  display: block;
  padding: 0.45rem 0.25rem;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.68rem;
  font-weight: 650;
  text-align: center;
}

.swatch-hint {
  margin: 0.55rem 0 0;
  color: var(--color-muted);
  font-size: 0.72rem;
}

.generator-status {
  color: var(--color-muted);
  font-size: 0.75rem;
}

.generator-status[data-state="ready"] {
  color: #2f7157;
}

.generator-status[data-state="error"] {
  color: #9a3b35;
}

.export-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1rem;
}

.button {
  display: inline-flex;
  min-height: 2.7rem;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 0.9rem;
  border: 1px solid transparent;
  border-radius: 0.32rem;
  font: inherit;
  font-size: 0.83rem;
  font-weight: 700;
  cursor: pointer;
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.button-primary {
  color: #fff;
  border-color: var(--tool-blue);
  background: var(--tool-blue);
}

.button-primary:not(:disabled):hover {
  background: var(--tool-blue-dark);
}

.button-secondary,
.button-quiet {
  color: var(--tool-blue);
  border-color: #a9bac7;
  background: #fff;
}

.button-secondary:not(:disabled):hover,
.button-quiet:hover {
  background: var(--color-soft);
}

.button-quiet {
  min-height: 2.2rem;
  padding: 0.35rem 0.65rem;
  color: var(--color-muted);
  border-color: #cbd4da;
  font-size: 0.75rem;
}

.control-field input:focus-visible,
.control-field select:focus-visible,
.button:focus-visible,
.swatch-button:focus-visible {
  outline: 3px solid var(--tool-focus);
  outline-offset: 2px;
  border-color: var(--tool-focus);
}

.error-message,
.tool-alert {
  max-width: none;
  margin: 0.8rem 0 0;
  padding: 0.75rem 0.85rem;
  color: #842f2a;
  border: 1px solid #e1b7b3;
  border-radius: 0.3rem;
  background: #fff6f5;
  font-size: 0.82rem;
}

.palette-help {
  margin-top: 3.25rem;
}

.help-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.help-grid article {
  padding: 1rem;
  border: 1px solid var(--color-line);
  border-radius: 0.4rem;
}

.help-grid h3 {
  margin: 0 0 0.55rem;
  padding: 0;
  border: 0;
  font-size: 0.95rem;
}

.help-grid p,
.source-note {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.8rem;
}

.source-note {
  margin-top: 1rem;
}

.tool-footer {
  display: flex;
  width: min(100% - 3rem, 1160px);
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.5rem 2.5rem;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 0.8rem;
}

@media (max-width: 900px) {
  .palette-workspace {
    grid-template-columns: 1fr;
  }

  .help-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 800px) {
  .tool-header {
    display: flex;
    padding: 0.8rem 1.25rem;
  }

  .tool-header .site-name {
    margin: 0;
  }

  .tool-nav {
    margin-top: 0;
  }

  .palette-main {
    width: min(100% - 2.5rem, 1160px);
  }

  .tool-heading {
    display: block;
  }

  .privacy-note {
    margin-top: -0.6rem;
  }
}

@media (max-width: 600px) {
  .tool-header {
    align-items: center;
    gap: 0.75rem;
  }

  .tool-nav {
    gap: 0;
  }

  .tool-nav a {
    padding-inline: 0.5rem;
    font-size: 0.76rem;
  }

  .control-field select,
  .control-field input[type="text"] {
    font-size: 1rem;
  }

  .palette-controls,
  .help-grid {
    grid-template-columns: 1fr;
  }

  .control-wide {
    grid-column: auto;
  }

  .export-actions .button {
    flex: 1 1 42%;
  }

  .tool-footer {
    display: block;
    width: min(100% - 2rem, 1160px);
  }

  .tool-footer span {
    display: block;
    margin-top: 0.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}