body { margin:0; background:var(--paper-0); color:var(--ink-0); }
.tools-shell { width:min(calc(100% - 2rem),1180px); margin:auto; padding:var(--space-7) 0 var(--space-9); }
.tools-hero { max-width:850px; margin-block-end:var(--space-7); }
.tools-hero h1,.tool-heading h1 { margin:.55rem 0 .7rem; font-size:clamp(2.8rem,6vw,5.8rem); line-height:.96; letter-spacing:-.05em; }
.tools-hero p,.tool-heading p { max-width:48rem; margin:0; color:var(--ink-1); font-size:1.08rem; line-height:1.8; }
.tools-grid { display:grid; grid-template-columns:repeat(12,minmax(0,1fr)); gap:1px; border:1px solid var(--line); background:var(--line); }
.tool-card { grid-column:span 4; min-height:17rem; padding:var(--space-5); display:flex; flex-direction:column; background:var(--paper-1); }
.tool-card__meta { display:flex; align-items:start; justify-content:space-between; gap:var(--space-4); }
.tool-index { color:var(--editorial-accent); font-size:var(--text-xs); font-weight:900; }
.tool-card h2 { margin:auto 0 .6rem; font-size:clamp(1.35rem,2.4vw,2rem); }
.tool-card p { margin:0; color:var(--ink-2); line-height:1.65; }
.tool-card__open { margin-block-start:var(--space-4); padding-block-start:var(--space-3); border-block-start:1px solid var(--line); font-size:var(--text-sm); font-weight:900; }
.tool-icon { display:inline-grid; place-items:center; min-inline-size:2.8rem; block-size:2.8rem; padding-inline:.45rem; border:1px solid var(--ink-0); font-weight:900; }
.back-link { display:inline-block; margin-block-end:var(--space-5); color:var(--ink-2); font-weight:800; }
.tool-heading { display:grid; grid-template-columns:auto 1fr; gap:var(--space-5); align-items:start; max-width:920px; }
.tool-workspace { margin-block-start:var(--space-6); border-block:2px solid var(--ink-0); background:var(--paper-1); padding:clamp(1.2rem,4vw,2.2rem); }
.tool-controls { display:grid; gap:var(--space-4); }
.tool-controls label { display:grid; gap:.5rem; color:var(--ink-1); font-weight:750; }
.tool-controls input,.tool-controls textarea,.tool-controls select { box-sizing:border-box; width:100%; padding:.8rem; border:1px solid var(--line); border-radius:0; background:var(--paper-0); color:var(--ink-0); font:inherit; }
.tool-controls textarea { direction:ltr; text-align:left; font-family:ui-monospace,SFMono-Regular,Consolas,monospace; }
.tool-controls button { min-height:2.8rem; padding:.75rem 1rem; border:1px solid var(--ink-0); border-radius:0; background:var(--ink-0); color:var(--paper-1); font-weight:900; cursor:pointer; }
.action-row,.check-row { display:flex; gap:.65rem; flex-wrap:wrap; }
.check-row label { display:flex; align-items:center; gap:.4rem; }
.check-row input { width:auto; }
.privacy-note { margin:var(--space-5) 0 0; padding-block-start:var(--space-4); border-block-start:1px solid var(--line); color:var(--ink-2); font-size:var(--text-sm); }
.tool-error { min-height:1.5em; color:var(--editorial-accent); }
.timestamp-output { display:grid; gap:.5rem; padding:1rem; background:var(--paper-0); border:1px solid var(--line); direction:ltr; text-align:left; }
.text-stats { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:1px; margin-block-start:1rem; background:var(--line); border:1px solid var(--line); }
.text-stats>div { display:grid; gap:.2rem; padding:1rem; background:var(--paper-1); }
.text-stats strong { font-size:1.6rem; }
.text-stats span { color:var(--ink-2); font-size:var(--text-xs); }
@media(max-width:850px){.tool-card{grid-column:span 6}}
@media(max-width:640px){
 .tools-shell{width:min(calc(100% - 1.2rem),1180px);padding-top:var(--space-6)}
 .tool-card{grid-column:1/-1;min-height:13rem}
 .tool-heading{grid-template-columns:1fr}
 .tools-hero h1,.tool-heading h1{font-size:clamp(2.5rem,13vw,4.2rem)}
 .text-stats{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* Visual System V2 — tools remain functional while sharing the publication language. */
html[data-theme="light"] body { background:var(--editorial-page-bg); }
.tools-shell {
  width:min(calc(100% - 2rem),var(--content-max));
  padding:2.5rem 0 4rem;
}
.tools-hero {
  margin-block-end:2.25rem;
}
.tools-hero h1,.tool-heading h1 {
  font-size:clamp(2.7rem,5vw,4.9rem);
  line-height:1;
}
.tools-grid {
  grid-template-columns:repeat(6,minmax(0,1fr));
  gap:1px;
  border:1px solid var(--line);
  background:var(--line);
}
.tool-card {
  grid-column:span 2;
  min-height:15rem;
}
.tool-card:nth-last-child(2):nth-child(3n+1),
.tool-card:last-child:nth-child(3n+2) {
  grid-column:span 3;
}
.tool-card:last-child:nth-child(3n+1) {
  grid-column:1 / -1;
  min-height:12rem;
}
.tool-card h2 {
  font-size:clamp(1.3rem,2vw,1.75rem);
}
.tool-icon {
  min-inline-size:2.55rem;
  block-size:2.55rem;
}
@media(max-width:850px){
  .tools-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .tool-card,
  .tool-card:nth-last-child(2):nth-child(3n+1),
  .tool-card:last-child:nth-child(3n+2),
  .tool-card:last-child:nth-child(3n+1){grid-column:auto;min-height:13rem}
}
@media(max-width:640px){
  .tools-shell{padding:1.8rem 0 3rem}
  .tools-grid{grid-template-columns:1fr}
  .tool-card,
  .tool-card:nth-last-child(2):nth-child(3n+1),
  .tool-card:last-child:nth-child(3n+2),
  .tool-card:last-child:nth-child(3n+1){grid-column:1;min-height:11.5rem;padding:1.15rem}
  .tools-hero{margin-block-end:1.6rem}
  .tools-hero h1,.tool-heading h1{font-size:clamp(2.45rem,12vw,3.65rem)}
}

/* Design System V3 — first-party SVG tool icon language. */
.tool-icon {
  inline-size: 2.7rem;
  min-inline-size: 2.7rem;
  block-size: 2.7rem;
  padding: 0;
  border-color: color-mix(in srgb, var(--accent) 42%, var(--border-subtle));
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
}
.tool-icon__svg {
  inline-size: 1.35rem;
  block-size: 1.35rem;
  stroke-width: 1.7;
}
.tool-card__open,
.back-link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}
.tool-card__arrow {
  inline-size: 1rem;
  block-size: 1rem;
  transition: transform var(--motion-fast) var(--ease-productive);
}
.tool-card__open:hover { color: var(--accent); }
.tool-card__open:hover .tool-card__arrow { transform: translateX(-2px); }
[dir="ltr"] .tool-card__open:hover .tool-card__arrow { transform: translateX(2px); }
.tool-controls textarea {
  font-family: var(--font-mono);
}


/* Public Surface Quality V2 — tools as task surfaces, not bordered grid cells. */
.tools-grid{
  gap:1rem;
  border:0;
  background:transparent;
}
.tool-card{
  border:1px solid var(--quality-surface-border);
  border-radius:var(--quality-radius-panel);
  background:var(--quality-surface-bg);
  box-shadow:var(--quality-surface-shadow);
  overflow:hidden;
}
.tool-card:hover{
  border-color:var(--quality-surface-border-strong);
  box-shadow:var(--quality-surface-shadow-hover);
  transform:translateY(-2px);
}
.tool-icon{
  border-color:var(--quality-icon-border);
  border-radius:var(--quality-radius-control);
  background:var(--quality-icon-bg);
  color:var(--accent);
  box-shadow:var(--shadow-1);
}
.tool-workspace{
  border:1px solid var(--quality-surface-border);
  border-radius:var(--quality-radius-panel);
  background:var(--quality-surface-bg);
  box-shadow:var(--quality-surface-shadow);
}
.tool-controls input,
.tool-controls textarea,
.tool-controls select{
  border-color:var(--quality-surface-border-strong);
  border-radius:var(--quality-radius-control);
  background:var(--surface-raised);
}
.tool-controls button{
  border-color:var(--accent);
  border-radius:var(--quality-radius-control);
  background:var(--accent);
  color:var(--editorial-active-text);
  box-shadow:var(--shadow-1);
}
.timestamp-output,
.text-stats{
  border-color:var(--quality-surface-border);
  border-radius:var(--quality-radius-control);
  background:var(--quality-surface-soft);
}

/* Public Surface Quality V2.1 — tool Web Component owns grid placement. */
.tools-grid > eg-tool-card{
  display:block;
  grid-column:span 2;
  min-inline-size:0;
}
.tools-grid > eg-tool-card > .tool-card{
  box-sizing:border-box;
  grid-column:auto;
  min-height:15rem;
  height:100%;
}
.tools-grid > eg-tool-card:nth-last-child(2):nth-child(3n+1),
.tools-grid > eg-tool-card:last-child:nth-child(3n+2){
  grid-column:span 3;
}
.tools-grid > eg-tool-card:last-child:nth-child(3n+1){
  grid-column:1 / -1;
}
@media(max-width:850px){
  .tools-grid > eg-tool-card,
  .tools-grid > eg-tool-card:nth-last-child(2):nth-child(3n+1),
  .tools-grid > eg-tool-card:last-child:nth-child(3n+2),
  .tools-grid > eg-tool-card:last-child:nth-child(3n+1){
    grid-column:auto;
  }
  .tools-grid > eg-tool-card > .tool-card{min-height:13rem}
}
@media(max-width:640px){
  .tools-grid > eg-tool-card{grid-column:1}
  .tools-grid > eg-tool-card > .tool-card{
    min-height:11.5rem;
    padding:1.15rem;
  }
}

/* Tool Lab V4 — grouped specialist tool catalog. */
.tool-categories{display:grid;gap:2.3rem}
.tool-category{display:grid;gap:.85rem}
.tool-category__head{
  display:grid;
  grid-template-columns:auto 1fr auto;
  gap:.7rem;
  align-items:end;
  padding-block-end:.65rem;
  border-block-end:1px solid var(--border-subtle);
}
.tool-category__head h2{margin:0;font-size:clamp(1.45rem,2.2vw,2rem);line-height:1.15}
.tool-category__head>span:last-child{color:var(--text-muted);font-size:.72rem;font-weight:900}
.tool-card--featured{
  border-color:color-mix(in srgb,var(--accent) 34%,var(--quality-surface-border));
  background:
    linear-gradient(145deg,color-mix(in srgb,var(--accent) 5%,transparent),transparent 52%),
    var(--quality-surface-bg);
}
.tool-card--featured .tool-icon{
  border-color:color-mix(in srgb,var(--accent) 54%,var(--quality-icon-border));
}
@media(max-width:640px){
  .tool-categories{gap:1.8rem}
  .tool-category__head{grid-template-columns:auto 1fr auto;align-items:center}
  .tool-category__head h2{font-size:1.3rem}
}

/* Tool → Community Bridge V1 */
.tool-community-bridge{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:1.25rem;align-items:center;margin-block:1.25rem;padding:1.1rem 1.2rem;border:1px solid var(--ds-border-subtle);border-radius:16px;background:var(--ds-surface-panel)}
.tool-community-bridge h2{margin:.25rem 0 .35rem;font-size:1.35rem;line-height:1.45}
.tool-community-bridge p{max-width:760px;margin:0;color:var(--ds-text-muted);font-size:.8rem;line-height:1.7}
.tool-community-bridge__topic{display:inline-flex;margin-top:.55rem;color:var(--ds-text-link);font-size:.72rem;font-weight:850;text-decoration:none}
.tool-community-bridge__actions{display:flex;gap:.55rem;flex-wrap:wrap;justify-content:flex-end}
.tool-community-bridge__actions>a{display:inline-flex;align-items:center;gap:.45rem;min-height:42px;padding:.65rem .85rem;border:1px solid var(--ds-action-secondary-border);border-radius:10px;background:var(--ds-action-secondary-bg);color:var(--ds-action-secondary-text);font-weight:900;text-decoration:none}
.tool-community-bridge__actions>a:first-child{border-color:var(--ds-action-primary-border);background:var(--ds-action-primary-bg);color:var(--ds-action-primary-text)}
.tool-community-bridge__actions .tool-icon__svg{width:1rem;height:1rem}
@media(max-width:760px){.tool-community-bridge{grid-template-columns:1fr}.tool-community-bridge__actions{justify-content:flex-start}.tool-community-bridge__actions>a{flex:1;justify-content:center}}

/* Tool → Community Bridge V1.1 — two-way tool discussions. */
.tool-community-shell{display:grid;gap:.8rem;margin-block:1.25rem}
.tool-community-shell>.tool-community-bridge{margin:0}
.tool-community-discussions{padding:1rem 1.1rem;border:1px solid var(--ds-border-subtle);border-radius:16px;background:var(--ds-surface-base)}
.tool-community-discussions>header{display:flex;align-items:end;justify-content:space-between;gap:1rem;margin-bottom:.8rem}
.tool-community-discussions>header h3,.tool-community-discussions--empty h3{margin:.15rem 0 0;font-size:1.05rem;line-height:1.45}
.tool-community-discussions>header>strong{color:var(--ds-text-muted);font-size:.7rem}
.tool-community-discussions__grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.65rem}
.tool-discussion-card{display:grid;align-content:start;gap:.45rem;padding:.85rem;border:1px solid var(--ds-border-subtle);border-radius:12px;background:var(--ds-surface-subtle)}
.tool-discussion-card__meta{display:flex;align-items:center;justify-content:space-between;gap:.65rem;color:var(--ds-text-muted);font-size:.65rem}
.tool-discussion-card__meta>span{display:inline-flex;align-items:center;gap:.35rem;color:var(--accent-secondary);font-weight:900}
.tool-discussion-card__meta .tool-icon__svg{width:.85rem;height:.85rem}
.tool-discussion-card h4{margin:0;font-size:.86rem;line-height:1.55}
.tool-discussion-card h4 a{color:var(--ds-text-strong);text-decoration:none}
.tool-discussion-card h4 a:hover{color:var(--ds-text-link)}
.tool-discussion-card p{display:-webkit-box;overflow:hidden;margin:0;color:var(--ds-text-muted);font-size:.7rem;line-height:1.65;-webkit-box-orient:vertical;-webkit-line-clamp:2}
.tool-discussion-card footer{display:flex;align-items:center;justify-content:space-between;gap:.65rem;padding-top:.5rem;margin-top:.15rem;border-top:1px solid var(--ds-divider);color:var(--ds-text-muted);font-size:.64rem}
.tool-discussion-card footer a{color:var(--ds-text-link);font-weight:800;text-decoration:none}
.tool-community-discussions--empty{display:block}
.tool-community-discussions--empty p{max-width:780px;margin:.3rem 0 0;color:var(--ds-text-muted);font-size:.75rem;line-height:1.7}
@media(max-width:760px){.tool-community-discussions__grid{grid-template-columns:1fr}.tool-community-discussions>header{align-items:flex-start}.tool-community-discussions{padding:.9rem}}

/* Tool Knowledge V1.2 — accepted community solutions. */
.tool-discussion-card.is-solved{border-color:var(--ds-status-success-border);background:color-mix(in srgb,var(--ds-status-success-bg) 72%,var(--ds-surface-subtle))}
.tool-discussion-card__meta{flex-wrap:wrap}
.tool-discussion-card__solved{display:inline-flex;align-items:center;gap:.3rem;margin-inline-start:auto;color:var(--ds-status-success-text);font-size:.63rem;font-weight:900}
.tool-discussion-card__solved .tool-icon__svg{width:.82rem;height:.82rem}
.tool-discussion-card__solution{display:grid;gap:.28rem;padding:.65rem .7rem;border:1px solid var(--ds-status-success-border);border-radius:9px;background:var(--ds-status-success-bg)}
.tool-discussion-card__solution>span{color:var(--ds-status-success-text);font-size:.68rem;font-weight:900}
.tool-discussion-card__solution>p{display:-webkit-box;overflow:hidden;margin:0;color:var(--ds-text-strong);font-size:.7rem;line-height:1.65;-webkit-box-orient:vertical;-webkit-line-clamp:3}
.tool-discussion-card__solution>small{color:var(--ds-text-muted);font-size:.68rem;font-weight:800}

/* Tool Social Signals V1 — community activity on the tool directory. */
.tool-card__community{display:flex;align-items:center;gap:.45rem;flex-wrap:wrap;margin:.35rem 0 .15rem}
.tool-card__community>span{display:inline-flex;align-items:center;min-height:25px;padding:.2rem .48rem;border:1px solid var(--ds-border-subtle);border-radius:999px;background:var(--ds-surface-subtle);color:var(--ds-text-muted);font-size:.68rem;font-weight:850}
.tool-card__community>span.is-solved{border-color:var(--ds-status-success-border);background:var(--ds-status-success-bg);color:var(--ds-status-success-text)}


/* Tool → Launchpad Bridge V1 — connect live utilities with product reviews and updates. */
.tool-launchpad-bridge{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  gap:1.1rem;
  align-items:center;
  margin-block:1.25rem;
  padding:1.05rem 1.15rem;
  border:1px solid color-mix(in srgb,var(--accent-secondary) 28%,var(--ds-border-subtle));
  border-radius:16px;
  background:linear-gradient(135deg,color-mix(in srgb,var(--accent-secondary) 7%,var(--ds-surface-panel)),var(--ds-surface-panel));
}
.tool-launchpad-bridge__identity{
  display:grid;
  gap:.35rem;
}
.tool-launchpad-bridge h2{
  margin:0;
  font-size:1.18rem;
  line-height:1.5;
}
.tool-launchpad-bridge p{
  max-width:760px;
  margin:0;
  color:var(--ds-text-muted);
  font-size:.78rem;
  line-height:1.75;
}
.tool-launchpad-bridge__chips{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem;
  margin-top:.35rem;
}
.tool-launchpad-bridge__chips>span{
  display:inline-flex;
  align-items:center;
  min-height:25px;
  padding:.2rem .52rem;
  border:1px solid var(--ds-border-subtle);
  border-radius:999px;
  background:var(--ds-surface-subtle);
  color:var(--ds-text-default);
  font-size:.68rem;
  font-weight:850;
}
.tool-launchpad-bridge__cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  min-height:44px;
  padding:.68rem .9rem;
  border:1px solid var(--ds-action-primary-border);
  border-radius:11px;
  background:var(--ds-action-primary-bg);
  color:var(--ds-action-primary-text);
  font-size:.75rem;
  font-weight:900;
  line-height:1.25;
  text-decoration:none;
  white-space:nowrap;
}
.tool-launchpad-bridge__cta:hover{background:var(--ds-action-primary-hover)}
.tool-launchpad-bridge__cta .tool-icon__svg{width:1rem;height:1rem}
@media(max-width:760px){
  .tool-launchpad-bridge{grid-template-columns:1fr}
  .tool-launchpad-bridge__cta{width:100%}
}

/* Site-wide Visual QA V1 — compact tool heroes on phones so the workspace arrives sooner. */
@media(max-width:640px){
  .tools-shell{
    padding-top:1.35rem;
  }
  .tools-hero{
    margin-block-end:1.35rem;
  }
  .tools-hero h1,
  .tool-heading h1{
    margin:.4rem 0 .55rem;
    font-size:clamp(2.15rem,10vw,2.8rem);
    line-height:1.12;
    letter-spacing:-.025em;
    overflow-wrap:anywhere;
  }
  .tool-heading{
    gap:.8rem;
  }
  .tool-detail .back-link{
    margin-block-end:1rem;
  }
  .tool-heading .tool-icon{
    inline-size:2.4rem;
    min-inline-size:2.4rem;
    block-size:2.4rem;
  }
  .tool-heading .tool-icon__svg{
    inline-size:1.15rem;
    block-size:1.15rem;
  }
  .tools-hero p,
  .tool-heading p{
    font-size:.98rem;
    line-height:1.72;
  }
}

/* Site-wide Visual Polish V2 — balanced mixed-language tool headings. */
@media(max-width:640px){
  .tools-hero h1,
  .tool-heading h1{
    max-inline-size:18ch;
    text-wrap:balance;
  }
  .tool-heading p,
  .tools-hero p{
    max-inline-size:62ch;
  }
}

/* Site-wide Visual Polish V3 — bring the desktop tool workspace closer to the heading. */
@media(min-width:641px){
  .tools-shell{
    padding-top:1.7rem;
  }
  .tool-detail .back-link{
    margin-block-end:1.1rem;
  }
  .tool-heading{
    gap:1.1rem;
    max-width:1050px;
  }
  .tool-heading h1{
    max-inline-size:15ch;
    font-size:clamp(2.7rem,4.2vw,4rem);
    line-height:1.06;
    letter-spacing:-.025em;
    text-wrap:balance;
    overflow-wrap:anywhere;
  }
  .tool-heading p{
    max-width:54rem;
    font-size:1.02rem;
    line-height:1.72;
  }
  .tool-workspace{
    margin-block-start:1.5rem;
  }
}

/* Avoid empty error placeholders occupying visual space. */
.tool-error:empty { display:none; }

/* Lab 2.0 shared utility actions and truthful processing notes. */
.tool-common-actions{display:flex;flex-wrap:wrap;gap:.7rem;margin-block-start:1rem}
.tool-common-actions .tool-common-action{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:44px;padding:.65rem .95rem;
  border:1px solid var(--quality-surface-border-strong);
  border-radius:var(--quality-radius-control);
  background:var(--surface-raised);color:var(--text-primary);
  font:inherit;font-size:clamp(.95rem,1vw,1.07rem);font-weight:750;cursor:pointer;
}
.tool-common-actions .tool-common-action:hover,
.tool-common-actions .tool-common-action:focus-visible{
  border-color:var(--accent);
  background:color-mix(in srgb,var(--accent) 8%,var(--surface-raised));
}
.tool-common-actions .tool-common-action:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.tool-common-status{min-height:1.4rem;color:var(--accent);line-height:1.6;font-size:1rem;margin:.4rem 0}
.tool-execution-note{
  display:flex;align-items:flex-start;gap:.7rem;
  padding:.85rem 1rem;margin-block-start:1.1rem;
  border:1px solid var(--quality-surface-border);border-radius:var(--quality-radius-control);
  background:var(--quality-surface-soft);color:var(--text-secondary);
  font-size:clamp(.93rem,1vw,1.05rem);line-height:1.78;
}
.tool-execution-note>span:first-child{color:var(--accent);font-size:1.22rem;line-height:1.3}
.tool-detail .tool-controls{min-width:0}
.tool-detail .tool-controls :is(textarea,input,select){font-size:clamp(1rem,1.1vw,1.12rem)}
.tool-detail .tool-controls label{font-size:clamp(.98rem,1.1vw,1.09rem)}
.tool-detail .tool-controls button{font-size:clamp(.97rem,1vw,1.08rem)}
.tool-detail .tool-error{font-size:1.02rem;line-height:1.65}
.tool-detail .privacy-note{font-size:.98rem;line-height:1.75}
@media(max-width:520px){
 .tool-common-actions .tool-common-action{flex:1 1 calc(50% - .7rem)}
 .tool-detail .tool-workspace{padding:1rem}
}
@media(prefers-reduced-motion:reduce){.tool-common-actions .tool-common-action{transition:none}}

.tool-input-hint{
  margin:0;
  color:var(--text-secondary);
  font-size:clamp(.95rem,1vw,1.05rem);
  line-height:1.7;
}

.tool-usage-guide{
  margin-block-start:1.1rem;
  overflow:hidden;
  border:1px solid var(--quality-surface-border);
  border-radius:var(--quality-radius-control);
  background:var(--quality-surface-bg);
}
.tool-usage-guide>summary{
  cursor:pointer;
  padding:.85rem 1rem;
  color:var(--text-primary);
  font-size:clamp(1rem,1.05vw,1.12rem);
  font-weight:800;
  line-height:1.65;
}
.tool-usage-guide>summary:hover{background:var(--quality-surface-soft)}
.tool-usage-guide>summary:focus-visible{outline:2px solid var(--accent);outline-offset:-3px}
.tool-usage-guide ol{
  margin:0;padding:.6rem 2.5rem 1rem 1rem;
  color:var(--text-secondary);
  line-height:1.8;
  font-size:clamp(.98rem,1vw,1.07rem);
}
[dir=ltr] .tool-usage-guide ol{padding: .6rem 1rem 1rem 2.5rem}
.tool-usage-guide li+li{margin-block-start:.4rem}

/* Lab 3.0 developer workbench: practical two-panel editors. */
.lab3-utility{min-width:0;gap:18px}
.lab3-utility__intro{
  display:grid;
  gap:6px;
  padding:18px 21px;
  border:1px solid color-mix(in srgb,var(--accent) 24%,var(--quality-surface-border));
  border-radius:14px;
  background:linear-gradient(120deg,color-mix(in srgb,var(--accent) 7%,var(--quality-surface-bg)),var(--quality-surface-bg));
}
.lab3-utility__intro strong{
  color:var(--text-primary);
  font-size:clamp(1.25rem,1.65vw,1.6rem);
  font-weight:900;
  line-height:1.5;
}
.lab3-utility__intro p{
  margin:0;
  max-width:70ch;
  color:var(--text-secondary);
  line-height:1.75;
  font-size:clamp(.99rem,1.07vw,1.1rem);
}
.lab3-utility__toolbar{
  display:flex;
  flex-wrap:wrap;
  align-items:end;
  gap:13px;
}
.lab3-utility__toolbar>label{
  min-width:180px;
  flex:0 0 auto;
  font-size:1rem;
}
.lab3-utility__toolbar .action-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
}
.lab3-utility__toolbar button{
  min-height:47px;
  padding:10px 17px;
  border-radius:10px;
  font-size:clamp(.99rem,1.06vw,1.1rem);
}
.lab3-utility__editors{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:14px;
  min-width:0;
}
.lab3-utility__panel{
  min-width:0;
  display:flex;
  flex-direction:column;
  padding:12px;
  gap:10px;
  border:1px solid var(--quality-surface-border);
  border-radius:15px;
  background:var(--quality-surface-bg);
}
.lab3-utility__panel--output{
  border-color:color-mix(in srgb,var(--accent) 24%,var(--quality-surface-border));
  background:color-mix(in srgb,var(--accent) 3%,var(--quality-surface-bg));
}
.lab3-utility__panel>header{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px;
}
.tool-controls .lab3-utility__panel>header label{
  color:var(--text-primary);
  font-size:clamp(1.04rem,1.16vw,1.18rem);
  font-weight:850;
}
.lab3-utility__panel>header output{
  color:var(--text-secondary);
  font-size:.92rem;
  font-variant-numeric:tabular-nums;
  line-height:1.5;
}
.tool-controls .lab3-utility__panel textarea{
  display:block;
  flex:1;
  min-width:0;
  min-height:300px;
  max-height:700px;
  width:100%;
  resize:vertical;
  padding:16px;
  border:1px solid var(--quality-surface-border-strong);
  border-radius:10px;
  background:var(--surface-raised);
  color:var(--text-primary);
  font-family:ui-monospace,SFMono-Regular,Consolas,monospace;
  font-size:clamp(.96rem,1vw,1.06rem);
  line-height:1.8;
  tab-size:2;
}
.tool-controls .lab3-utility__panel textarea:focus{
  border-color:var(--accent);
  outline:2px solid color-mix(in srgb,var(--accent) 25%,transparent);
  outline-offset:1px;
}
.tool-controls .lab3-utility__panel--output textarea{
  background:color-mix(in srgb,var(--accent) 3%,var(--surface-raised));
}
.lab3-utility__panel textarea::placeholder{color:var(--text-muted)}
.lab3-utility .tool-error:empty{display:none}
@media(max-width:840px){
  .lab3-utility__editors{grid-template-columns:1fr}
  .tool-controls .lab3-utility__panel textarea{min-height:185px}
}
@media(max-width:460px){
  .lab3-utility__panel{padding:10px}
  .lab3-utility__toolbar .action-row button{flex:1 1 auto}
  .lab3-utility__intro{padding:14px}
}

/* Lab 3.0 visual QA: one coherent page heading, early access to the tool. */
.tool-detail .tool-heading{
  width:100%;
  max-width:1130px;
  min-width:0;
  grid-template-columns:auto minmax(0,1fr);
  gap:16px;
}
.tool-detail .tool-heading>div{min-width:0}
.tool-detail .tool-heading h1{
  max-inline-size:none;
  margin:.3rem 0 .48rem;
  font-size:clamp(2rem,3.35vw,3.45rem);
  line-height:1.2;
  letter-spacing:-.025em;
  text-wrap:pretty;
  overflow-wrap:normal;
}
.tool-detail .tool-heading p{
  max-width:78ch;
  font-size:clamp(1rem,1.08vw,1.12rem);
  line-height:1.78;
}
.tool-detail .tool-workspace{margin-block-start:1.15rem}
.tool-detail .back-link{margin-block-end:.9rem}
@media(max-width:640px){
  .tool-detail .tool-heading{grid-template-columns:1fr;gap:10px}
  .tool-detail .tool-heading h1{
    max-inline-size:none;
    font-size:clamp(2rem,8.8vw,2.7rem);
    line-height:1.23;
    overflow-wrap:anywhere;
  }
}

/* Lab 4: truthful, local JSON diagnostics with keyboard-friendly tree disclosure. */
.lab4-json-validation{
  display:block;
  padding:13px 16px;
  border:1px solid var(--quality-surface-border-strong);
  border-inline-start:3px solid var(--accent);
  border-radius:10px;
  background:var(--surface-raised);
  color:var(--text-secondary);
  font-size:clamp(1rem,1.05vw,1.08rem);
  font-weight:780;
  line-height:1.8;
  overflow-wrap:anywhere;
}
.lab4-json-validation[data-tone="good"]{
  border-inline-start-color:var(--success-text);
  color:var(--success-text);
}
.lab4-json-validation[data-tone="bad"]{
  border-inline-start-color:var(--danger-text);
  color:var(--danger-text);
}
.lab4-json-explorer{
  min-width:0;
  display:grid;
  gap:12px;
  padding:15px;
  border:1px solid var(--quality-surface-border);
  border-radius:14px;
  background:var(--quality-surface-bg);
}
.lab4-json-explorer[hidden]{display:none}
.lab4-json-explorer>header{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  align-items:baseline;
  justify-content:space-between;
}
.lab4-json-explorer h3{
  margin:0;
  color:var(--text-primary);
  font-size:1.2rem;
}
.lab4-json-explorer header span{
  color:var(--text-secondary);
  font-size:.97rem;
}
.lab4-json-tree{
  min-height:48px;
  max-height:520px;
  overflow:auto;
  overscroll-behavior:contain;
  padding:13px;
  border:1px solid var(--quality-surface-border);
  border-radius:11px;
  background:var(--surface-raised);
  color:var(--text-primary);
  font-family:ui-monospace,SFMono-Regular,Consolas,monospace;
  font-size:clamp(.96rem,1.03vw,1.08rem);
  line-height:1.65;
  text-align:left;
  direction:ltr;
}
.lab4-json-node{margin-block:5px}
.lab4-json-node>summary{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:baseline;
  padding:7px 9px;
  border:1px solid var(--border-subtle);
  border-radius:7px;
  cursor:pointer;
  color:var(--text-primary);
  background:var(--quality-surface-bg);
}
.lab4-json-node>summary:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
}
.lab4-json-node>summary:hover{
  border-color:var(--accent);
}
.lab4-json-children{
  min-width:0;
  margin-inline-start:15px;
  padding-inline-start:11px;
  border-inline-start:1px solid var(--quality-surface-border);
}
.lab4-json-leaf{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:12px;
  padding:6px 9px;
  border-block-end:1px solid var(--border-subtle);
}
.lab4-json-key{
  flex:0 0 auto;
  font-weight:800;
  color:var(--accent);
  overflow-wrap:anywhere;
}
.lab4-json-value{
  min-width:0;
  overflow-wrap:anywhere;
  color:var(--text-primary);
  white-space:pre-wrap;
}
.lab4-json-value[data-type="string"]{color:var(--success-text)}
.lab4-json-value[data-type="number"]{color:var(--accent-secondary,var(--accent))}
.lab4-json-value[data-type="boolean"]{color:var(--warning-text)}
.lab4-json-count{color:var(--text-secondary);font-size:.91rem}
.lab4-json-limit{
  margin:7px;
  color:var(--text-muted);
  font-size:.9rem;
}
@media(max-width:540px){
 .lab4-json-tree{padding:9px;max-height:440px}
 .lab4-json-children{margin-inline-start:7px;padding-inline-start:8px}
 .lab4-json-leaf{padding:6px}
}

/* Always-visible copy action attached to utility results. */
.lab4-utility-out-actions{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  justify-content:flex-end;
  gap:10px;
}
.tool-detail .tool-controls .lab4-utility-copy{
  min-height:35px;
  padding:5px 12px;
  border:1px solid var(--quality-surface-border-strong);
  border-radius:8px;
  background:var(--surface-raised);
  color:var(--text-primary);
  font-size:.95rem;
  font-weight:800;
}
.tool-detail .tool-controls .lab4-utility-copy:hover{
  border-color:var(--accent);
  color:var(--accent);
}