:root {
  --tool-bg: var(--bg);
  --tool-panel: transparent;
  --tool-panel-2: var(--bg-elev);
  --tool-field: var(--bg-elev);
  --tool-line: var(--rule);
  --tool-text: var(--text);
  --tool-muted: var(--text-muted);
  --tool-primary: var(--text);
  --tool-primary-text: var(--bg);
  --tool-bad: var(--danger);
  --tool-good: #88a98c;
  --tool-warn: var(--warn);
  --tool-radius: var(--r-md);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  background: var(--tool-bg);
  color: var(--tool-text);
  font-family: var(--font-sans);
}

body {
  min-height: 100vh;
}

.tool-page {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: clamp(32px, 5vw, 64px) clamp(20px, 4vw, 48px) 64px;
}

.tool-top {
  display: flex;
  align-items: center;
  margin-bottom: clamp(28px, 4vw, 44px);
  color: var(--tool-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

.tool-back {
  border: 0;
  border-bottom: 1px solid var(--tool-line);
  border-radius: 0;
  padding: 3px 0;
  text-decoration: none;
}

.tool-back:hover {
  color: var(--tool-text);
  border-bottom-color: var(--accent);
}

.tool-hero {
  border: 0;
  border-bottom: 1px solid var(--rule-soft);
  border-radius: 0;
  background: transparent;
  padding: 0 0 clamp(28px, 4vw, 44px);
  margin-bottom: 18px;
}

.tool-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(52px, 8vw, 108px);
  font-weight: 400;
  letter-spacing: -.06em;
  line-height: .9;
}

.tool-desc {
  margin: 18px 0 0;
  color: var(--tool-muted);
  font-size: clamp(16px, 1.8vw, 20px);
  line-height: 1.6;
  max-width: 760px;
}

.tool-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, .95fr);
  gap: 14px;
  align-items: start;
}

.tool-card {
  border: 1px solid var(--tool-line);
  border-radius: var(--tool-radius);
  background: var(--tool-panel);
  padding: clamp(18px, 2.4vw, 26px);
}

.tool-card + .tool-card {
  margin-top: 14px;
}

.tool-card h2,
.tool-card h3 {
  margin: 0 0 14px;
}

.tool-card h2 {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -.005em;
}

.tool-card h3 {
  color: var(--tool-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .08em;
}

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

textarea,
input,
select {
  width: 100%;
  border: 1px solid var(--tool-line);
  border-radius: var(--r-md);
  background: var(--tool-field);
  color: var(--tool-text);
  padding: 10px 12px;
  transition: border-color .15s ease, background .15s ease;
}

textarea:focus,
input:focus,
select:focus {
  border-color: var(--accent);
  outline: 0;
}

textarea {
  min-height: 260px;
  resize: vertical;
  line-height: 1.55;
  font-family: var(--font-mono);
  font-size: 13px;
}

.output {
  min-height: 330px;
}

input[type="color"] {
  height: 40px;
  padding: 4px;
}

input[type="checkbox"],
input[type="radio"] {
  width: auto;
  accent-color: var(--accent);
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.field-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field {
  display: grid;
  gap: 6px;
}

.field label,
.switch-label {
  color: var(--tool-muted);
  font-size: 13px;
}

.radio-row,
.button-row,
.mode-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.radio-pill,
.mode-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--tool-line);
  border-radius: var(--r-md);
  padding: 8px 10px;
  color: var(--tool-muted);
}

button,
.tool-button {
  border: 1px solid var(--tool-line);
  border-radius: var(--r-md);
  background: transparent;
  color: var(--tool-text);
  padding: 10px 14px;
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease, color .15s ease;
}

button:hover,
.tool-button:hover {
  border-color: var(--text-faint);
  background: var(--tool-panel-2);
}

button.primary {
  background: var(--tool-primary);
  border-color: var(--tool-primary);
  color: var(--tool-primary-text);
}

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

button.danger {
  color: var(--tool-bad);
}

button.danger:hover {
  border-color: var(--tool-bad);
}

button.small {
  padding: 7px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
}

.tool-muted,
.help {
  color: var(--tool-muted);
  line-height: 1.65;
}

.help {
  font-size: 13px;
  white-space: pre-line;
}

.status-line {
  margin: 10px 0 0;
  color: var(--tool-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  min-height: 1.4em;
}

.status-line.is-error {
  color: var(--tool-bad);
}

.status-line.is-good {
  color: var(--tool-good);
}

.status-line.is-warn {
  color: var(--tool-warn);
}

.object-list {
  display: grid;
  gap: 8px;
  max-height: 260px;
  overflow: auto;
  padding-right: 4px;
}

.object-item {
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 8px;
  align-items: center;
  border: 1px solid var(--tool-line);
  border-radius: var(--r-md);
  background: transparent;
  color: var(--tool-text);
  padding: 10px;
  text-align: left;
}

.object-item.is-active {
  background: var(--tool-panel-2);
  border-color: var(--accent);
}

.object-index,
.object-meta {
  color: var(--tool-muted);
}

.object-meta {
  font-family: var(--font-mono);
  font-size: 11px;
}

.param-table-wrap {
  overflow-x: auto;
}

.param-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.param-table th,
.param-table td {
  border-bottom: 1px solid var(--tool-line);
  padding: 8px 6px;
  text-align: left;
  vertical-align: middle;
}

.param-table th {
  color: var(--tool-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
}

.param-table input {
  min-width: 110px;
  padding: 8px;
}

.param-name {
  display: grid;
  gap: 2px;
}

.param-key {
  color: var(--tool-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.param-label {
  white-space: pre-line;
}

.param-safe {
  color: #88a98c;
}

.param-warn {
  color: var(--warn);
}

.param-risk {
  color: var(--danger);
}

.param-unknown {
  color: var(--text-faint);
}

.curve-box {
  border: 1px solid var(--tool-line);
  border-radius: var(--r-md);
  background: var(--tool-field);
  padding: 10px;
}

.curve-canvas {
  display: block;
  width: 100%;
  height: 220px;
  cursor: crosshair;
}

.small-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

details.tool-card summary {
  cursor: pointer;
}

details.tool-card summary h2 {
  display: inline;
}

.tool-workspace {
  display: grid;
  grid-template-columns: minmax(300px, .78fr) minmax(0, 1.22fr);
  gap: 14px;
  align-items: start;
}

.tool-form {
  display: grid;
  gap: 14px;
}

.tool-form-section {
  display: grid;
  gap: 10px;
  padding-top: 14px;
  border-top: 1px solid var(--rule-soft);
}

.tool-form-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.tool-form-section > h3 {
  margin: 0;
  color: var(--tool-text);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0;
}

.tool-form textarea {
  min-height: 150px;
}

.tool-output {
  min-height: 520px;
}

.tool-drop {
  display: grid;
  place-items: center;
  min-height: 92px;
  border: 1px dashed var(--tool-line);
  border-radius: var(--r-md);
  color: var(--tool-muted);
  text-align: center;
  cursor: pointer;
}

.tool-drop:hover,
.tool-drop.is-dragging {
  border-color: var(--accent);
  color: var(--tool-text);
}

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

.tool-check {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  color: var(--tool-muted);
  font-size: 13px;
  line-height: 1.45;
}

.tool-check input {
  margin-top: 3px;
}

.drawing-board,
.image-preview {
  display: block;
  width: 100%;
  border: 1px solid var(--tool-line);
  border-radius: var(--r-md);
  background:
    linear-gradient(45deg, var(--rule-soft) 25%, transparent 25%),
    linear-gradient(-45deg, var(--rule-soft) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--rule-soft) 75%),
    linear-gradient(-45deg, transparent 75%, var(--rule-soft) 75%);
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-size: 16px 16px;
}

.drawing-board {
  aspect-ratio: 800 / 608;
  cursor: crosshair;
  touch-action: none;
}

.image-preview {
  min-height: 180px;
  max-height: 520px;
  object-fit: contain;
}

@media (max-width: 1040px) {
  .tool-grid,
  .tool-workspace,
  .field-grid,
  .field-grid.three {
    grid-template-columns: 1fr;
  }

  .tool-output {
    min-height: 360px;
  }
}

@media (max-width: 760px) {
  .tool-page {
    padding-top: 28px;
  }

  .tool-top {
    margin-bottom: 28px;
  }
}

.tool-top {
  justify-content: space-between;
  gap: 16px;
}

.tool-controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.tool-controls button {
  width: auto;
  color: var(--tool-muted);
}

.tool-collapsible {
  display: block;
}

.tool-collapsible > summary {
  cursor: pointer;
  list-style-position: outside;
}

.tool-collapsible > summary h3 {
  display: inline;
  margin: 0;
}

.tool-section-body {
  display: grid;
  gap: 10px;
  padding-top: 12px;
}

@media (max-width: 560px) {
  .tool-top {
    align-items: flex-start;
  }

  .tool-controls {
    max-width: 70%;
  }
}

.tool-inline-help {
  margin-top: 10px;
  color: var(--tool-muted);
  font-size: 13px;
}

.tool-inline-help > summary {
  width: fit-content;
  cursor: pointer;
}

.tool-inline-help .help {
  margin: 8px 0 0;
}

.tool-source-copy { margin-top: 14px; }
.tool-source-copy .help { white-space: pre-line; margin: 10px 0 0; }