*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --border: #2a2d3e;
  --text: #e8eaf0;
  --text-muted: #7c8098;
  --accent: #6e7bff;
  --accent-hover: #8491ff;
  --radius: 12px;
  --radius-sm: 8px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
}

/* ── Light mode ───────────────────────────────────────────────────────────── */
:root.light {
  --bg: #f3f4f8;
  --bg-card: #ffffff;
  --border: #d8dae8;
  --text: #1a1d2e;
  --text-muted: #6b6e85;
  --accent: #4f5ef0;
  --accent-hover: #3d4cde;
}
:root.light body {
  background: var(--bg);
}
:root.light .color-input-group {
  background: #f3f4f8;
}
:root.light .color-input-group input[type="text"] {
  color: var(--text);
}
:root.light .css-snippet,
:root.light .token-output pre {
  color: var(--text-muted);
}
:root.light .tag {
  background: #e4e6f1;
  color: var(--text-muted);
}
:root.light .tag--hover {
  background: #deeeff;
  color: #2a7fd4;
}
:root.light .tag--active {
  background: #eedeff;
  color: #8b3fc8;
}
:root.light .tag--t3 {
  background: #d4f5e2;
  color: #1a7a42;
}
:root.light .tag--t4 {
  background: #feecd8;
  color: #b85a10;
}
:root.light .tag--t5 {
  background: #fde8e8;
  color: #b91c1c;
}
:root.light .tag--fixed {
  background: #d4f5e2;
  color: #1a7a42;
}
:root.light .hist-item {
  background: #f3f4f8;
}
:root.light .hist-item:hover {
  background: #eaecf8;
}
:root.light .set-row {
  background: #f3f4f8;
}
:root.light .set-label-input {
  color: var(--text);
}
:root.light .history-count {
  background: #f3f4f8;
}
:root.light .fix-percent-input {
  background: #f3f4f8;
}
/* Delta E quality indicators: dark-mode values are too light for white bg */
:root.light .delta-e.good,
:root.light .hist-delta.good {
  color: #15803d;
}
:root.light .delta-e.ok,
:root.light .hist-delta.ok {
  color: #b45309;
}
:root.light .delta-e.bad,
:root.light .hist-delta.bad {
  color: #dc2626;
}
/* Swatch borders: white-tinted border is invisible on light bg */
:root.light .hist-swatch {
  border-color: rgba(0, 0, 0, 0.14);
}
:root.light .hist-swatch--blend {
  border-color: rgba(0, 0, 0, 0.2);
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 2rem 1rem;
  line-height: 1.5;
}
.container {
  max-width: 960px;
  margin: 0 auto;
}
header {
  margin-bottom: 2.5rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}
.header-text {
  flex: 1;
}
h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}
.subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ── Theme toggle ─────────────────────────────────────────────────────────── */
.theme-icon-btn {
  flex-shrink: 0;
  margin-top: 0.2rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.3rem;
  border-radius: 6px;
  color: var(--text-muted);
  transition:
    color 0.15s,
    transform 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.theme-icon-btn:hover {
  color: var(--text);
  transform: scale(1.15);
}
.subtitle code {
  font-family: var(--font-mono);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.85em;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
h2 {
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-muted);
}
.color-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.color-field {
  flex: 1;
  min-width: 200px;
}
label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}
.tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15em 0.5em;
  border-radius: 999px;
  background: #2a2d3e;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}
.tag--hover {
  background: #1e2d45;
  color: #6ab4ff;
}
.tag--active {
  background: #2d1e3e;
  color: #c084fc;
}
.tag--t3 {
  background: #1e3a2d;
  color: #4ade80;
}
.tag--t4 {
  background: #3a2a1a;
  color: #fb923c;
}
.tag--t5 {
  background: #2a1e1e;
  color: #f87171;
}
.color-input-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.75rem;
  transition: border-color 0.15s;
}
.color-input-group:focus-within {
  border-color: var(--accent);
}
.color-input-group input[type="color"] {
  width: 28px;
  height: 28px;
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
  border-radius: 4px;
}
.color-input-group input[type="text"] {
  background: none;
  border: none;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  outline: none;
  width: 100%;
}
.color-preview {
  height: 6px;
  border-radius: 0 0 4px 4px;
  margin-top: 4px;
  transition: background-color 0.2s;
}
.fix-percent-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.6rem;
}
.fix-percent-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0;
  white-space: nowrap;
  flex-shrink: 0;
}
.fix-percent-input {
  width: 72px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.25rem 0.5rem;
  outline: none;
  transition: border-color 0.15s;
}
.fix-percent-input:focus {
  border-color: var(--accent);
}
.fix-percent-input::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}
.color-space-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  margin-bottom: 1rem;
}
.fix-pct-container {
  display: contents;
}
.ctrl-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}
.color-space-select {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.25rem 0.5rem;
  outline: none;
  cursor: pointer;
  transition: border-color 0.15s;
}
.color-space-select:focus {
  border-color: var(--accent);
}
/* ── Mode checkboxes ─────────────────────────────────────────────────────── */
.mode-ctrl-group {
  gap: 0.4rem;
  align-self: center;
  flex-wrap: wrap;
}
.mode-check-label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.25rem 0.6rem;
  line-height: 1.4;
  margin-bottom: 0;
  transition:
    border-color 0.15s,
    color 0.15s;
  user-select: none;
  white-space: nowrap;
}
.mode-check-label:has(input:checked) {
  border-color: var(--accent);
  color: var(--text);
}
.mode-check-label:hover {
  border-color: var(--accent-hover);
}
.mode-check-label input[type="checkbox"] {
  accent-color: var(--accent);
  width: 13px;
  height: 13px;
  margin: 0;
  cursor: pointer;
  flex-shrink: 0;
}
.tag--fixed {
  background: #1e3a2d;
  color: #4ade80;
  font-size: 0.65rem;
  padding: 0.1em 0.45em;
  letter-spacing: 0.03em;
  border-radius: 999px;
  margin-left: 0.3rem;
  font-weight: 700;
}
.divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
}
.divider::before,
.divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── Section header with Add button ───────────────────────────────────────── */
.section-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.section-header-row h2 {
  margin-bottom: 0;
}
.sets-actions-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.75rem;
}
.btn-add-set {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.7rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition:
    color 0.15s,
    border-color 0.15s;
}
.btn-add-set:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ── Compact set row ──────────────────────────────────────────────────────── */
#setsContainer {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}
.set-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 0.6rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.set-name-col {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  min-width: 80px;
}
.set-label-input {
  width: 80px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.2rem 0.3rem;
  outline: none;
  transition: border-color 0.15s;
}
.set-label-input:focus {
  border-color: var(--accent);
}
.set-color-col {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  flex: 1;
  min-width: 0;
}
.set-col-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.2rem;
}
.set-col-label {
  font-size: 0.68rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.set-col-label .tag {
  font-size: 0.58rem;
  padding: 0.08em 0.35em;
}
.target-remove-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  opacity: 0.5;
  transition:
    opacity 0.15s,
    color 0.15s;
  flex-shrink: 0;
}
.target-remove-btn:hover {
  color: #f87171;
  opacity: 1;
}
.set-add-target-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  transition:
    color 0.15s,
    border-color 0.15s;
}
.set-add-target-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.color-input-group.compact {
  padding: 0.25rem 0.5rem;
}
.color-input-group.compact input[type="color"] {
  width: 22px;
  height: 22px;
}
.color-input-group.compact input[type="text"] {
  font-size: 0.78rem;
}
.fix-percent-row.compact {
  margin-top: 0.2rem;
}
.fix-percent-row.compact .fix-percent-input {
  width: 52px;
  font-size: 0.72rem;
  padding: 0.15rem 0.35rem;
}
.fix-percent-row.compact .fix-percent-label {
  font-size: 0.68rem;
}
.set-remove-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition:
    color 0.15s,
    border-color 0.15s;
  padding: 0;
  flex-shrink: 0;
}
.set-remove-btn:hover {
  color: #f87171;
  border-color: #f87171;
}

/* ── Result set groups ────────────────────────────────────────────────────── */
.result-set-group {
  margin-bottom: 1rem;
}
.result-set-label-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.result-set-blend-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.result-blend-hex {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
}
.result-set-pcts {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 0.2rem;
}
/* History per-set blend display */
.hist-multi-blends {
  display: flex;
  gap: 2px;
}
.hist-swatch-lbl--muted {
  color: var(--text-muted);
}
.hist-set-pct-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.65rem;
  color: var(--text-muted);
  min-width: 48px;
}
.result-set-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
  text-transform: capitalize;
}
/* In flex row context (non-shared mode), don't offset vertically */
.result-set-label-row .result-set-label { margin-bottom: 0; }
.btn-calculate {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    background 0.15s,
    transform 0.1s;
  white-space: nowrap;
}
.btn-calculate:hover {
  background: var(--accent-hover);
}
.btn-calculate:active {
  transform: scale(0.98);
}
.btn-calculate:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.results-section {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.result-header h2 {
  margin-bottom: 0;
}
.perf-warning {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.6rem 0.85rem;
  margin-bottom: 1rem;
  border-radius: 8px;
  font-size: 0.82rem;
  line-height: 1.4;
  color: #a07a20;
  background: color-mix(in srgb, #f59e0b 12%, transparent);
  border: 1px solid color-mix(in srgb, #f59e0b 35%, transparent);
}
:root.light .perf-warning {
  color: #7a5a0a;
  background: color-mix(in srgb, #f59e0b 14%, transparent);
  border-color: color-mix(in srgb, #f59e0b 40%, transparent);
}
.perf-warning svg {
  flex-shrink: 0;
  margin-top: 0.12em;
  stroke: #f59e0b;
}
.color-space-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  font-size: 0.8rem;
}
.badge-label {
  color: var(--text-muted);
}
.badge-value {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
}
.blend-color-result {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.blend-swatch {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.blend-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.blend-hex {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.blend-pct-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.blend-pct-badge .badge-label {
  font-size: 0.75rem;
}
.blend-pct-badge .badge-value {
  font-size: 1.1rem;
}
.blend-pct-badges {
  display: flex;
  gap: 1.5rem;
  margin-left: auto;
}
.states-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 600px) {
  .states-grid {
    grid-template-columns: 1fr;
  }
  .set-row {
    flex-wrap: wrap;
  }
  .set-name-col {
    width: 100%;
  }
  .color-space-row {
    flex-wrap: wrap;
  }
  .set-color-col {
    min-width: 100px;
  }
}
.state-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.state-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.state-mix-preview {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
}
.mix-swatch {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.mix-swatch.blend-indicator {
  border-style: dashed;
}
.mix-swatch.result-swatch {
  width: 48px;
  height: 48px;
  border-radius: 8px;
}
.mix-arrow {
  color: var(--text-muted);
  font-size: 1rem;
  flex-shrink: 0;
}
.compare-arrow {
  font-size: 0.7rem;
}
.target-compare-swatch {
  width: 48px;
  height: 48px;
}
.mix-swatch-labeled {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}
.mix-swatch-label {
  font-size: 0.6rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
/* Side-by-side result/target comparison — mirrors hist-overlay-wrap */
.mix-compare-wrap { display: flex; flex-direction: column; align-items: center; gap: 0.2rem; }
.mix-compare-labels { display: flex; gap: 0; }
.mix-compare-labels .mix-swatch-label { width: 48px; text-align: center; }
.mix-compare-swatches { display: flex; gap: 0; box-shadow: 0 0 0 1px rgba(128,128,128,0.18); border-radius: 6px; overflow: visible; }
.mix-compare-swatches .result-swatch { border: none; border-radius: 6px 0 0 6px; }
.mix-compare-swatches .target-compare-swatch { border: none; border-radius: 0 6px 6px 0; }
.mix-copyable { cursor: pointer; }
.mix-copyable:hover { outline: 1px dashed rgba(255,255,255,0.6); outline-offset: 2px; z-index: 1; position: relative; }
:root.light .mix-copyable:hover { outline-color: rgba(0,0,0,0.45); }
.mix-swatch--copied { outline: 2px solid var(--accent) !important; outline-offset: 1px; z-index: 1; position: relative; }
.state-details {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.detail-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
}
.detail-label {
  color: var(--text-muted);
}
.detail-value {
  font-family: var(--font-mono);
  font-weight: 600;
}
.detail-color {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.tiny-swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.delta-e {
  font-size: 0.82rem;
}
.delta-e.good {
  color: #4ade80;
}
.delta-e.ok {
  color: #facc15;
}
.delta-e.bad {
  color: #f87171;
}
.css-snippet {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 2.2rem 0.6rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  word-break: break-all;
  line-height: 1.6;
}
.copy-snippet-btn {
  position: absolute;
  top: 50%;
  right: 0.4rem;
  transform: translateY(-50%);
  padding: 0.25rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
}
.copy-snippet-btn:hover {
  color: var(--text);
}
.token-output {
  position: relative;
}
.token-output pre {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--text-muted);
  white-space: pre-wrap;
  word-break: break-all;
}
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 6px;
  padding: 0.35rem 0.6rem;
  font-size: 0.78rem;
  cursor: pointer;
  transition:
    color 0.15s,
    border-color 0.15s;
}
.copy-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}
.copy-css-btn {
  margin-top: 1rem;
}
.copy-btn.copied {
  color: #4ade80;
  border-color: #4ade80;
}
[hidden] {
  display: none !important;
}

/* ── Tooltip ─────────────────────────────────────────────────────────────── */
@keyframes tooltip-in {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}
[data-tooltip] {
  position: relative;
}
[data-tooltip]::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%);
  background: #0a0c13;
  color: #e8eaf0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  white-space: nowrap;
  padding: 0.3em 0.65em;
  border-radius: 6px;
  border: 1px solid #2a2d3e;
  pointer-events: none;
  opacity: 0;
  z-index: 100;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}
[data-tooltip]::after {
  content: "";
  position: absolute;
  bottom: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: #2a2d3e;
  pointer-events: none;
  opacity: 0;
  z-index: 100;
}
[data-tooltip]:hover::before,
[data-tooltip]:hover::after {
  animation: tooltip-in 0.15s ease forwards;
}
/* Touch devices: tooltips are unreachable on hover and cause horizontal overflow */
@media (hover: none) {
  [data-tooltip]::before,
  [data-tooltip]::after {
    display: none;
  }
}


/* ── Keyboard focus rings ─────────────────────────────────────────────────── */
/* Visible focus outline for keyboard navigation (not triggered by mouse)       */
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}
.color-space-select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}
.fix-percent-input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}
.set-label-input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}
.hist-swatch:focus-visible {
  outline: 2px solid var(--accent) !important;
  outline-offset: 2px;
}

/* ── History section ──────────────────────────────────────────────────────── */
.history-section {
  margin-top: 1.5rem;
}
.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.history-header h2 {
  margin-bottom: 0;
}
.history-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.15em 0.6em;
}
.history-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.btn-clear-history {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 1rem;
  padding: 0.45rem 0.85rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition:
    color 0.15s,
    border-color 0.15s;
}
.btn-clear-history:hover {
  color: #f87171;
  border-color: #f87171;
}

/* History item */
.hist-item {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 0.6rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition:
    border-color 0.15s,
    background 0.15s;
  user-select: none;
}
.hist-scroll-body {
  /* overflow-x is visible on desktop — no scroll, no scrollbar, tooltips unclipped */
  -webkit-overflow-scrolling: touch;
  padding-top: 2px;
  min-width: 0;
}
.hist-item:hover {
  background: #1e2030;
}

/* Top row with blend swatch + space + actions */
.hist-top-row {
  position: absolute;
  top: 0.4rem;
  right: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  z-index: 1;
}

/* Swatches */
.hist-swatch {
  width: 32px;
  height: 32px;
  border-radius: 5px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
  cursor: pointer;
  transition: outline 0.1s;
}
.hist-swatch:hover {
  outline: 1px dashed rgba(255, 255, 255, 0.6);
  outline-offset: 2px;
}
:root.light .hist-swatch:hover {
  outline-color: rgba(0, 0, 0, 0.45);
}
.hist-swatch--copied {
  outline: 2px solid var(--accent) !important;
}
.hist-swatch--blend {
  border-style: dashed;
  border-color: rgba(255, 255, 255, 0.2);
}
.hist-swatch--state {
  position: relative;
  border: none;
  border-radius: 5px 0 0 5px;
}
.hist-swatch--result {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 0 5px 5px 0;
}
.hist-swatch--state:hover {
  z-index: 2;
}

/* Blend overlay layer (inside .hist-swatch--state) - kept for reference */
.hist-overlay-layer {
  display: none;
}

/* Column groups */
.hist-base-col,
.hist-blend-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  flex-shrink: 0;
}
.hist-swatch-lbl {
  font-size: 0.58rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  text-align: center;
  letter-spacing: 0.02em;
  max-width: 56px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Separator */
.hist-sep {
  width: 1px;
  height: 32px;
  background: var(--border);
  flex-shrink: 0;
  margin: 0 0.1rem;
}

/* State columns */
.hist-state-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  flex-shrink: 0;
}
.hist-state-row {
  display: flex;
  align-items: center;
  gap: 5px;
}
.hist-pct {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.hist-tag-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 3px;
}
.hist-tag-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.hist-delta {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 600;
  min-width: 2.4em;
  text-align: left;
}
.hist-delta.good {
  color: #4ade80;
}
.hist-delta.ok {
  color: #facc15;
}
.hist-delta.bad {
  color: #f87171;
}
.hist-space-badge {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: 999px;
  padding: 0.15em 0.55em;
  flex-shrink: 0;
  white-space: nowrap;
  align-self: center;
}
.hist-overlay-wrap {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0;
  border-radius: 5px;
  box-shadow: 0 0 0 1px rgba(128, 128, 128, 0.18);
}
.hist-state-badge {
  position: absolute;
  top: -7px;
  right: -7px;
  z-index: 1;
  font-size: 0.48rem !important;
  padding: 0.12em 0.38em !important;
  line-height: 1.2;
  pointer-events: none;
}
.hist-arrow-icon {
  color: var(--text-muted);
  opacity: 0.5;
  flex-shrink: 0;
}

/* Delete button */
.hist-reuse {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2em 0.65em;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition:
    color 0.15s,
    border-color 0.15s,
    background 0.15s;
  white-space: nowrap;
}
.hist-reuse:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}
.hist-pin {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition:
    color 0.15s,
    border-color 0.15s;
  padding: 0;
  line-height: 1;
}
.hist-pin:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.hist-pin.pinned {
  color: var(--accent);
}
.hist-item.pinned {
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
}
.hist-delete {
  margin-left: 0;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition:
    color 0.15s,
    border-color 0.15s,
    background 0.15s;
  padding: 0;
  line-height: 1;
}
.hist-delete:hover {
  color: #f87171;
  border-color: #f87171;
  background: rgba(248, 113, 113, 0.08);
}

/* History multi-set lines */
.hist-sets {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.hist-set-line {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.2rem 0;
  flex-wrap: nowrap;
  min-width: 0;
}
.hist-set-name {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 60px;
  text-transform: capitalize;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.hist-state-col {
  align-items: center;
}
.hist-set-break {
  display: none;
}

/* ── Pct header row ───────────────────────────────────────────────────────── */
/* Ghost elements mirror left-side of set-line for exact column alignment */
.hist-pct-header-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: -4px;
  padding-top: 8px;
  flex-wrap: nowrap;
}
.hist-ghost {
  visibility: hidden;
  pointer-events: none;
  flex-shrink: 0;
}
/* Each pct col contains a height-0 ghost state-row (for width matching) + the visible badge */
.hist-pct-header-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  flex-shrink: 0;
  gap: 0;
}
.hist-pct-header-col .hist-ghost {
  height: 0;
  overflow: hidden;
}
/* Badge is 64px wide (= 2 × 32px overlay-wrap), centered over the two swatches */
.hist-pct-header {
  width: 64px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
/* Per-set variable % shown in state column (independent mode) */
.hist-pct-inline {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.68rem;
  color: var(--text);
  letter-spacing: 0.02em;
  white-space: nowrap;
  min-width: 2.8em;
  text-align: left;
}

/* ── Tree layout (shared blend mode) ──────────────────────────────────────── */
/* hist-body--tree stacks header row above tree-inner (column direction)       */
.hist-body--tree {
  display: flex;
  flex-direction: column;
}
.hist-tree-inner {
  display: flex;
  align-items: stretch;
}
.hist-tree-root {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  min-width: 58px;
  position: relative;
}
.hist-tree-root::after {
  content: "";
  position: absolute;
  left: calc(50% + 16px);
  right: 0;
  top: 50%;
  border-top: 1px solid var(--border);
}
/* Badge and label are absolute so only the swatch stays in flex flow → swatch centers at 50% */
.hist-tree-root .hist-swatch-lbl {
  position: absolute;
  top: calc(50% + 20px);
  left: 50%;
  transform: translateX(-50%);
}
.hist-sets--tree {
  flex: 1;
}
.hist-sets--tree .hist-set-line {
  position: relative;
  padding-left: 18px;
}
/* Header row: offset = tree-root width (58px) + trunk indent (18px) */
.hist-body--tree > .hist-pct-header-row {
  padding-left: calc(58px + 18px);
}
/* Vertical trunk — extend by half-gap (0.15rem) on each side to bridge the row gaps */
.hist-sets--tree .hist-set-line::before {
  content: "";
  position: absolute;
  left: 0;
  top: -0.15rem;
  bottom: -0.15rem;
  border-left: 1px solid var(--border);
}
/* Horizontal branch */
.hist-sets--tree .hist-set-line::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 14px;
  border-top: 1px solid var(--border);
}
/* First: trunk starts from center */
.hist-sets--tree .hist-set-line:first-child::before {
  top: 50%;
}
/* Last: trunk ends at center */
.hist-sets--tree .hist-set-line:last-child::before {
  bottom: 50%;
}
/* Single set: no trunk */
.hist-sets--tree .hist-set-line:only-child::before {
  display: none;
}

/* ── Per-set arrow connector ──────────────────────────────────────────────── */
.hist-set-arrow {
  color: var(--text-muted);
  opacity: 0.5;
  font-size: 0.85rem;
  flex-shrink: 0;
  line-height: 1;
}

/* ── Summary badges row ───────────────────────────────────────────────────── */
.hist-summary-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-bottom: 0.4rem;
}
.hist-summary-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.6rem;
  font-weight: 500;
  color: var(--text-muted);
  background: color-mix(in srgb, var(--text-muted) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--text-muted) 18%, transparent);
  border-radius: 999px;
  padding: 0.15em 0.55em;
  white-space: nowrap;
}
.hist-summary-badge .tag {
  font-size: 0.55rem;
  padding: 0.1em;
  min-width: 1.5em;
  text-align: center;
}
.hist-space-badge-wrap {
  min-width: 3em;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-shrink: 0;
}
.hist-space-badge--inline {
  font-size: 0.55rem;
  padding: 0.1em 0.45em;
}

/* Flash animation when inputs are restored from history */
@keyframes hist-restore-flash {
  0%,
  100% {
    border-color: var(--border);
  }
  50% {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(110, 123, 255, 0.15);
  }
}
.input-section.hist-restored {
  animation: hist-restore-flash 0.7s ease;
}

@media (max-width: 540px) {
  .hist-scroll-body {
    overflow-x: auto;
    overflow-y: clip; /* clip prevents the implicit vertical scrollbar without creating a scroll container */
  }
  .hist-reuse {
    margin-left: auto;
  }
  .hist-top-row {
    position: static;
    gap: 0.5rem;
    margin-bottom: 0.4rem;
  }
  .hist-reuse {
    order: 10;
    margin-left: auto;
  }
  .hist-pin {
    order: 11;
  }
  .hist-delete {
    order: 12;
  }
  .hist-set-line {
    row-gap: 0.4rem;
    align-items: flex-start;
  }
  .hist-set-break {
    display: none;
    flex-shrink: 0;
  }
  .hist-set-name {
    min-width: unset;
    flex-shrink: 0;
  }
  .hist-set-pct-badge {
    min-width: unset;
  }
  .hist-swatch {
    width: 28px;
    height: 28px;
  }
  .hist-swatch--result {
    width: 28px;
    height: 28px;
  }
  .hist-pct-header {
    width: 56px; /* 2 × 28px swatches */
  }
  .hist-body--tree {
    gap: 0.4rem;
  }
  .hist-tree-inner {
    flex-direction: column;
    gap: 0.4rem;
  }
  .hist-tree-root {
    flex-direction: row;
    gap: 0.5rem;
    min-width: unset;
  }
  .hist-tree-root::after {
    display: none;
  }
  .hist-tree-root .hist-swatch-lbl {
    position: static;
    transform: none;
  }
  .hist-body--tree > .hist-pct-header-row {
    padding-left: 0;
  }
  .hist-sets--tree .hist-set-line {
    padding-left: 0;
  }
  .hist-sets--tree .hist-set-line::before,
  .hist-sets--tree .hist-set-line::after {
    display: none;
  }
}

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: 1.5rem 0 0.5rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.site-footer a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.site-footer a:hover {
  color: var(--accent);
}