/* ============================================
   ZAR Engineering Tools — Premium Industrial Revamp
   ============================================ */

/* ===== HERO (new premium two-column) ===== */
.tools-hero-premium{
  padding:120px 0 70px;
  background:linear-gradient(180deg,var(--bg-soft) 0%,var(--bg) 100%);
  border-bottom:1px solid var(--line);
  position:relative;
  overflow:hidden;
}
.tools-hero-grid{
  display:grid;
  grid-template-columns:1.15fr 0.85fr;
  gap:60px;
  align-items:center;
}
.tools-hero-copy .eyebrow{
  letter-spacing:.18em;
  font-size:.72rem;
  color:var(--brand-2);
  margin-bottom:14px;
}
.tools-hero-copy h1{
  font-size:clamp(2.9rem,5.8vw,5.6rem);
  line-height:.92;
  letter-spacing:-.04em;
  margin:0 0 18px;
}
.tools-hero-copy .lead{
  font-size:1.08rem;
  line-height:1.55;
  max-width:560px;
  color:var(--muted);
  margin-bottom:28px;
}
.tools-hero-stats{
  display:flex;
  gap:28px;
  margin:32px 0 28px;
  flex-wrap:wrap;
}
.tools-hero-stats > div{
  font-size:.82rem;
  color:var(--muted);
}
.tools-hero-stats b{
  display:block;
  font-size:1.65rem;
  line-height:1;
  font-weight:950;
  color:var(--text);
  margin-bottom:2px;
}
.tools-hero-actions{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}
.tools-hero-actions .btn.ghost{
  background:transparent;
}
.tools-hero-visual{
  position:relative;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:28px;
  padding:38px 32px 32px;
  box-shadow:0 10px 40px rgba(0,0,0,.06);
}
.tools-visual-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:10px;
  margin-bottom:22px;
}
.tools-visual-grid .v-item{
  aspect-ratio:1/1;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1.55rem;
  font-weight:900;
  letter-spacing:-.02em;
  background:linear-gradient(145deg,#fff,#f3f6f1);
  border:1px solid var(--line);
  border-radius:14px;
  color:#1a211c;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.8);
}
html[data-theme="dark"] .tools-visual-grid .v-item{
  background:linear-gradient(145deg,#16211b,#0f1814);
  color:#d4e1d4;
  border-color:#26352e;
}
.tools-visual-label{
  font-size:.68rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--brand-2);
  text-align:center;
  font-weight:800;
}

/* ===== TOOLBAR (search + filters) ===== */
.tools-toolbar{
  padding:28px 0 8px;
  background:var(--bg);
  border-bottom:1px solid var(--line);
  position:sticky;
  top:70px;
  z-index:50;
}
.tools-toolbar-inner{
  display:flex;
  flex-wrap:wrap;
  gap:16px;
  align-items:center;
  justify-content:space-between;
}
.tools-search{
  position:relative;
  flex:1;
  min-width:260px;
  max-width:420px;
}
.tools-search input{
  width:100%;
  font-size:1rem;
  padding:14px 18px 14px 48px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--surface);
  color:var(--text);
  outline:none;
  transition:border-color .2s, box-shadow .2s;
}
.tools-search input:focus{
  border-color:var(--brand);
  box-shadow:0 0 0 4px color-mix(in srgb,var(--brand),transparent 85%);
}
.tools-search .search-icon{
  position:absolute;
  left:18px;
  top:50%;
  transform:translateY(-50%);
  font-size:.85rem;
  color:var(--muted);
  pointer-events:none;
  font-family:monospace;
  opacity:.7;
}
.tools-filters{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.filter-chip{
  font-size:.78rem;
  font-weight:800;
  letter-spacing:.06em;
  padding:9px 16px;
  border:1px solid var(--line);
  background:var(--surface);
  color:var(--muted);
  border-radius:999px;
  cursor:pointer;
  transition:all .15s ease;
  white-space:nowrap;
}
.filter-chip:hover{
  border-color:var(--brand);
  color:var(--text);
}
.filter-chip.active{
  background:var(--brand);
  color:#0b1a2a;
  border-color:var(--brand);
  font-weight:900;
}
.tools-count{
  margin-top:14px;
  font-size:.82rem;
  color:var(--muted);
}
.tools-count b{color:var(--text)}

/* ===== TOOLS GRID ===== */
.tools-section{padding:38px 0 60px}
.tools-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(278px,1fr));
  gap:18px;
}
.tool-card{
  position:relative;
  overflow:hidden;
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:26px 26px 22px;
  border:1px solid var(--line);
  border-radius:20px;
  background:var(--surface);
  text-decoration:none;
  isolation:isolate;
  transition:transform .22s cubic-bezier(.2,.7,.2,1),
             box-shadow .22s ease,
             border-color .2s ease;
}
.tool-card:hover{
  transform:translateY(-7px);
  border-color:var(--brand);
  box-shadow:0 24px 55px rgba(0,0,0,.13);
}
.tool-glow{
  position:absolute;
  top:-80%;
  right:-45%;
  width:240px;
  height:240px;
  border-radius:50%;
  background:radial-gradient(circle,color-mix(in srgb,var(--brand),transparent 52%),transparent 72%);
  z-index:-1;
  opacity:0;
  transition:opacity .35s ease;
  pointer-events:none;
}
.tool-card:hover .tool-glow{opacity:.95}
.tool-ring{
  position:absolute;
  top:-48px;
  right:-48px;
  width:138px;
  height:138px;
  border:1px solid color-mix(in srgb,var(--brand),transparent 68%);
  border-radius:50%;
  z-index:-1;
  opacity:0;
  pointer-events:none;
}
.tool-card:hover .tool-ring{
  animation:toolPing 1.55s ease-out infinite;
}
@keyframes toolPing{
  0%{transform:scale(.55);opacity:0}
  35%{opacity:.65}
  100%{transform:scale(1.7);opacity:0}
}
.tool-tag{
  position:absolute;
  top:18px;
  right:18px;
  font-size:.59rem;
  font-weight:900;
  letter-spacing:.09em;
  text-transform:uppercase;
  color:var(--brand-2);
  background:color-mix(in srgb,var(--brand),transparent 87%);
  border:1px solid color-mix(in srgb,var(--brand),transparent 52%);
  padding:3px 9px 2px;
  border-radius:999px;
}
.tool-icon{
  font-size:2.25rem;
  line-height:1;
  filter:drop-shadow(0 8px 16px rgba(0,0,0,.12));
  transition:transform .25s cubic-bezier(.2,.8,.2,1);
  margin:4px 0 2px;
}
.tool-card:hover .tool-icon{
  transform:translateY(-4px) scale(1.08);
}
.tool-card h3{
  font-size:1.22rem;
  line-height:1.15;
  margin:2px 0 2px;
  font-weight:900;
  letter-spacing:-.015em;
}
.tool-card p{
  font-size:.91rem;
  line-height:1.45;
  color:var(--muted);
  margin:0;
  flex:1;
}
.tool-hint{
  margin-top:8px;
  display:flex;
  align-items:center;
  gap:8px;
  font-size:.72rem;
  color:var(--muted);
}
.tool-hint .hint-label{
  font-weight:800;
  letter-spacing:.05em;
  text-transform:uppercase;
}
.tool-hint code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  background:var(--bg-soft);
  padding:1px 7px;
  border-radius:6px;
  color:var(--brand-2);
  font-weight:700;
  border:1px solid var(--line);
}
.tool-open{
  font-weight:900;
  color:var(--brand-2);
  margin-top:16px;
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:.9rem;
  letter-spacing:-.01em;
}
.tool-open::after{
  content:'→';
  display:inline-block;
  transition:transform .22s ease;
}
.tool-card:hover .tool-open::after{
  transform:translate(3px,-2px);
}

/* ===== VALUE SECTION ===== */
.tools-value{padding:30px 0 70px;background:var(--bg-soft)}
.tools-value-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:22px;
  margin:38px 0 12px;
}
.value-item{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:18px;
  padding:24px 26px;
}
.value-item h4{
  margin:10px 0 8px;
  font-size:1.18rem;
  font-weight:900;
}
.value-item p{
  margin:0;
  color:var(--muted);
  font-size:.94rem;
  line-height:1.5;
}
.value-icon{
  font-size:1.85rem;
  opacity:.9;
}

/* ===== TOOL PAGE (individual calculators) ===== */
.tool-page{padding:132px 0 70px}
.tool-breadcrumb{font-size:.78rem;color:var(--muted);margin-bottom:18px}
.tool-breadcrumb a{color:var(--brand-2);font-weight:800}
.tool-page h1{font-size:clamp(2.35rem,4.6vw,4.1rem);line-height:.94;margin:.35rem 0 12px}
.tool-calc{padding:32px;border:1px solid var(--line);border-radius:24px;background:var(--surface);margin:28px 0}
.tool-form{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;align-items:end}
.tool-form label{display:flex;flex-direction:column;gap:6px;font-size:.78rem;font-weight:800;color:var(--muted)}
.tool-form input,.tool-form select{
  width:100%;border:1px solid var(--line);border-radius:12px;
  background:var(--bg-soft);color:var(--text);padding:13px 14px;outline:none;
  font-size:1rem;
}
.tool-form input:focus,.tool-form select:focus{border-color:var(--brand)}
.tool-result{
  margin-top:26px;padding:26px;border-radius:18px;
  background:linear-gradient(135deg,color-mix(in srgb,var(--brand),transparent 90%),transparent);
  border:1px solid var(--line);
}
.tool-result h3{font-size:.95rem;margin:0 0 6px;color:var(--muted)}
.tool-big{font-size:2.55rem;font-weight:950;margin:0;color:var(--text);line-height:1.05}
.tool-note{font-size:.85rem;color:var(--muted);margin-top:10px}
.tool-content{padding:12px 0 22px;max-width:740px}
.tool-content h2{font-size:1.38rem;margin:26px 0 8px}
.tool-content p,.tool-content li{color:var(--muted);font-size:.96rem}
.tool-content code{background:var(--bg-soft);padding:2px 7px;border-radius:5px;font-size:.9em}
.tool-related{padding:22px 24px;border:1px solid var(--line);border-radius:18px;background:var(--surface);margin:22px 0}
.tool-related h3{font-size:1.05rem;margin:0 0 10px}
.tool-related ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:7px}
.tool-related a{color:var(--brand-2);font-weight:800}
.tool-lead{
  padding:26px 28px;border-radius:20px;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  color:#0b1a2a;margin:22px 0;display:flex;flex-direction:column;gap:12px;align-items:flex-start;
}
.tool-lead p{font-size:1.08rem;font-weight:900;margin:0;color:#0b1a2a}
.tool-lead .btn{background:#0b1a2a;color:#fff;border-color:#0b1a2a}
.tool-lead-note{font-size:.72rem;opacity:.85}
.tool-disclaimer{
  font-size:.78rem;color:var(--muted);
  border-top:1px solid var(--line);
  padding-top:13px;margin-top:22px;
}

/* Workspace (kept for calculators) */
.zar-workspace{margin:30px 0;padding:26px;border:1px solid var(--line);border-radius:22px;background:var(--surface)}
.ws-head{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin-bottom:16px}
.ws-head h3{font-size:1.3rem;margin:0}
.ws-actions{display:flex;gap:8px;flex-wrap:wrap}
.ws-btn{border:1px solid var(--line);background:var(--bg-soft);color:var(--text);border-radius:999px;padding:8px 14px;font-size:.8rem;font-weight:700;cursor:pointer}
.ws-btn:hover{border-color:var(--brand)}
.ws-btn-danger{color:#c0392b;border-color:#e0b4b0}
.ws-empty{color:var(--muted);font-size:.9rem}
.ws-list{display:flex;flex-direction:column;gap:10px}
.ws-item{padding:14px 16px;border:1px solid var(--line);border-radius:14px;background:var(--bg-soft)}
.ws-item-head{display:flex;justify-content:space-between;align-items:center;gap:10px}
.ws-item-head b{font-size:.95rem}
.ws-remove{border:0;background:transparent;color:var(--muted);font-size:1.2rem;cursor:pointer;line-height:1}
.ws-item-result{font-size:1.1rem;font-weight:800;color:var(--brand-2);margin:6px 0 2px}
.ws-item-meta{font-size:.72rem;color:var(--muted)}
.tool-save{margin-top:14px}
.tool-save .ws-btn{background:var(--brand);color:#0b1a2a;border-color:var(--brand)}
@media(max-width:700px){.ws-actions{width:100%}.ws-btn{flex:1;text-align:center}}

/* ===== RESPONSIVE ===== */
@media(max-width:980px){
  .tools-hero-grid{grid-template-columns:1fr;gap:42px}
  .tools-hero-visual{padding:28px 24px}
}
@media(max-width:700px){
  .tools-hero-premium{padding:92px 0 54px}
  .tools-toolbar{top:64px}
  .tools-toolbar-inner{flex-direction:column;align-items:stretch}
  .tools-search{max-width:none}
  .tools-filters{overflow-x:auto;padding-bottom:6px;margin:-4px -4px 0}
  .filter-chip{flex-shrink:0}
  .tools-grid{grid-template-columns:1fr}
  .tool-card{padding:22px}
  .tool-icon{font-size:2rem}
  .tool-big{font-size:2.1rem}
  .tools-hero-stats{gap:18px}
}
/* ZAR Engineering Interpretation layer */
.tool-interpret{margin-top:18px;border:1px solid var(--line);border-radius:16px;padding:18px;background:var(--surface);box-shadow:var(--shadow)}
.tool-interpret-head{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.tool-interpret-head span{color:var(--brand-2);font-weight:900}
.tool-interpret-head b{font-size:.95rem}
.tool-interpret-head em{font-size:.72rem;color:var(--muted);font-style:normal;margin-left:auto}
.tool-interpret-row{display:grid;grid-template-columns:140px 1fr;gap:4px 14px;padding:8px 0;border-top:1px solid var(--line)}
.tool-interpret-row span{font-size:.72rem;font-weight:900;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.tool-interpret-row b{color:var(--brand-2)}
.tool-interpret-row p{grid-column:2;margin:0;font-size:.84rem;color:var(--muted)}
.tool-interpret-related{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
.tool-interpret-related .btn{min-height:38px;font-size:.82rem}
@media (max-width:700px){.tool-interpret-row{grid-template-columns:1fr}.tool-interpret-row p{grid-column:1}}