/* style.css */
:root{
  --accent:#6a6af4;
  --badge:#E1000F;
  --text:#2e2e2e;
  --text-strong:#111111;
  --muted:#6a6a6a;
  --border:#d8d8d8;
  --bg-soft:#f1f1f1;
  --bg-soft-2:#f6f6f6;
  --page-w:800px;
  --menu-w:1200px;
  --text-spacing: 0 0 16px 0;
}
/* Adaptation au volume : palette, typographie et bordures du site de référence. */
[hidden]{ display:none !important; }
html{ -webkit-text-size-adjust:100%; }
body{ font-size:1rem; }
h2{ color:var(--text-strong); font-size:24px; line-height:32px; margin:0 0 14px; }
h3{ color:var(--text-strong); font-size:20px; line-height:28px; margin:20px 0 10px; }
a{ color:#4141b8; }
:focus-visible{ outline:2px solid var(--accent); outline-offset:3px; }
.volume-fields{ display:block; }
.volume-fields .field-row{ min-width:0; justify-content:flex-end; }
.volume-fields input{ font-family:inherit; }
.volume-fields [aria-invalid="true"]{ border-color:var(--badge); }
.volume-panel .hint:not(:empty){ color:#b0000c; }
.volume-panel .formula{ font-size:16px !important; line-height:26px !important; }
.volume-panel .form{ padding-bottom:8px; }
.volume-panel .sim-right{ display:flex; align-items:center; justify-content:center; }
.volume-panel .volume-diagram{ width:100%; max-width:420px; height:auto; }
.volume-panel .volume-diagram svg{ width:100%; height:auto; }
.volume-diagram text{ paint-order:stroke; stroke:#fff; stroke-width:4px; stroke-linejoin:round; }
.conversion-table{ min-width:0 !important; }
details.accordion[open] .accordion-body{ max-height:none; }
.accordion-summary h2{ gap:12px; }
.accordion-summary h2::after{ flex:none; }
.result-box{ max-width:100%; }
.result-strong{ overflow-wrap:anywhere; }
@media(max-width:600px){
  .menu{ flex-wrap:wrap; }
  [data-multi-calculator] .calculator-element-header{ flex-wrap:wrap; }
  [data-multi-calculator] .calculator-element-actions{ flex-wrap:wrap; }
  .tab{ text-align:left; max-width:100%; }
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{ transition:none !important; }
}
*{ box-sizing:border-box; }
*{ border-radius: 0 !important; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background:#fff;
}
.skip-link{
  position:absolute;
  left:-9999px;
  top:auto;
  width:1px;
  height:1px;
  overflow:hidden;
}
.skip-link:focus{
  left:12px;
  top:12px;
  width:auto;
  height:auto;
  padding:10px 12px;
  background:#fff;
  border:1px solid var(--border);
  z-index:9999;
}
/* Header / menu */
.site-header{
  margin-top:12px;
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
  background:#fff;
}
.menu-wrap{
  max-width: var(--menu-w);
  margin:0 auto;
  padding:14px 16px;
}
.menu{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}
.logo-link{
  display:inline-flex;
  align-items:center;
  text-decoration:none;
  min-width:0;
}
.logo{ display:block; width:56px; height:56px; }
.brand{
  display:flex;
  flex-direction:column;
  margin-left:12px;
  line-height:1.15;
  min-width:0;
}
.site-name{
  font-weight:700;
  font-size:18px;
  line-height:24px;
  color: var(--text-strong);
}
.site-slogan{
  margin-top:2px;
  font-size:14px;
  line-height:18px;
  color: var(--muted);
}
.badge{
  display:inline-flex;
  align-items:center;
  padding:10px 12px;
  border:1px solid var(--badge);
  background: var(--badge);
  color:#fff;
  font-weight:700;
  font-size:14px;
  line-height:18px;
  white-space:nowrap;
}
/* Page layout */
.page{
  max-width: var(--page-w);
  margin: 34px auto 60px auto;
  padding: 0 16px;
}
/* Typo */
h1{
  margin: 0 0 12px 0;
  color: var(--text-strong);
  font-size:32px;
  line-height:40px;
  font-weight:700;
}
p{
  font-size:18px !important;
  line-height:28px !important;
  margin: var(--text-spacing);
  color: var(--text);
}
p strong{
  color: var(--text-strong);
  font-weight:700;
}
.section{ margin: 0 0 28px 0; }
/* Intro */
.intro{
  margin-top:0;
  padding: 0 0 0 14px;
  border:0;
  border-left:4px solid var(--accent);
  background:transparent;
}
/* Simulator */
.simulator{
  border:1px solid var(--border);
  background:#fff;
  padding:14px;
}
/* Calculateurs : plusieurs parties dans un même calculateur */
[data-multi-calculator] .calculator-element + .calculator-element{
  border-top:1px solid var(--border);
  margin-top:20px;
  padding-top:20px;
}
[data-multi-calculator] .calculator-element-header:not([hidden]){
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:12px;
}
[data-multi-calculator] .calculator-element-actions{
  display:flex;
  align-items:center;
  gap:8px;
  margin-left:auto;
}
[data-multi-calculator] .calculator-element-title{
  color:var(--text-strong);
  font-size:18px;
  font-weight:700;
}
[data-multi-calculator] .calculator-add,
[data-multi-calculator] .calculator-subtract,
[data-multi-calculator] .calculator-remove{
  appearance:none;
  border:1px solid var(--border);
  background:var(--bg-soft-2);
  color:var(--text-strong);
  font:inherit;
  font-weight:600;
  line-height:24px;
  padding:10px 14px;
  cursor:pointer;
}
[data-multi-calculator] .calculator-add{
  width:100%;
  margin-top:12px;
  font-size:18px;
}
[data-multi-calculator] .calculator-add span{
  margin-right:6px;
}
[data-multi-calculator] .calculator-remove{
  background:#fff;
  color:var(--badge);
}
[data-multi-calculator] .calculator-add:hover,
[data-multi-calculator] .calculator-subtract:hover,
[data-multi-calculator] .calculator-remove:hover{
  background:#ededed;
  border-color:var(--text-strong);
}
[data-multi-calculator] .calculator-add:focus-visible,
[data-multi-calculator] .calculator-subtract:focus-visible,
[data-multi-calculator] .calculator-remove:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
}
[data-multi-calculator] .result-row{ flex-wrap:wrap; }
[data-multi-calculator] .result-box{ max-width:100%; min-width:0; }
[data-multi-calculator] .result-strong{ overflow-wrap:anywhere; }
/* Tabs */
.tabs{
  display:flex;
  gap:10px;
  margin: 2px 0 14px 0;
  flex-wrap:wrap;
}
.tab{
  appearance:none;
  border:1px solid var(--border);
  background: var(--bg-soft-2);
  color: var(--text-strong);
  padding:12px 14px;
  cursor:pointer;
  font-weight:700;
  font-size:18px;
  line-height:22px;
}
.tab:hover{ background: #ededed; }
.tab:focus{
  outline:none;
  box-shadow: 0 0 0 3px rgba(0,0,0,0.12);
}
.tab.is-active{
  background:#fff;
  border-color: var(--text-strong);
  color: var(--text-strong);
}
.sim-grid{
  display:flex;
  gap:16px;
  align-items:stretch;
}
.sim-left,.sim-right{ width:50%; min-width:0; }
.form{ padding: 8px 6px 6px 6px; }
.field-row{
  display:flex;
  flex-direction:column;
  gap:8px;
  margin-bottom:12px;
}
label{
  font-size:18px;
  line-height:28px;
  font-weight:700;
  color: var(--text-strong);
}
input{
  width:100%;
  padding:12px 12px;
  border:1px solid var(--border);
  font-size:17px;
  outline:none;
}
input:focus{
  border-color: var(--text-strong);
  box-shadow: 0 0 0 3px rgba(0,0,0,0.10);
}
.formula{ margin: 8px 0 0 0; color: var(--text-strong); }
.hint{
  margin:10px 0 0 0;
  color: var(--muted);
  font-size:16px !important;
  line-height:22px !important;
  min-height:22px;
}
[data-multi-calculator] .hint:empty{
  margin:0;
  min-height:0;
}
/* Diagrammes */
.diagram{
  border:0 !important;
  background:transparent !important;
  height:220px;
  display:flex;
  align-items:center;
  justify-content:center;
  overflow:visible;
}
.diagram svg{
  width:100%;
  height:220px;
  display:block;
}
/* Separator & result */
.separator{
  height:1px;
  background: var(--border);
  margin:16px 0 12px 0;
}
.result-row{
  display:flex;
  align-items:center;
  gap:12px;
  padding: 2px 2px 6px 2px;
}
.result-label{
  font-weight:400;
  color: var(--text-strong);
}
.result-box{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 12px;
  background: var(--bg-soft);
  border:1px solid var(--border);
  color: var(--text-strong);
}
.result-strong{ font-weight:700; }
/* Accordions */
.accordion{
  border:1px solid var(--border);
  background:#fff;
  margin:0 0 14px 0;
}
.accordion:hover{ background: #f8f8f8; }
.accordion-summary{
  cursor:pointer;
  list-style:none;
  padding: 12px 12px;
}
.accordion-summary::-webkit-details-marker{ display:none; }
.accordion-summary h2{
  margin:0;
  font-size:20px;
  line-height:28px;
  color: var(--text-strong);
  display:flex;
  align-items:center;
  justify-content:space-between;
  font-weight:700;
}
.accordion-summary h2::after{
  content:"▾";
  font-size:18px;
  color: var(--text-strong);
}
details[open] .accordion-summary h2::after{ content:"▴"; }
/* Ouverture/fermeture */
.accordion-body{
  background:#fff;
  padding: 16px 12px 12px 12px;
  overflow:hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 250ms ease, opacity 200ms ease;
}
details[open] .accordion-body{
  max-height: 900px;
  opacity: 1;
}
details.accordion-formulas[open] .accordion-body,
details.accordion-units[open] .accordion-body{
  max-height: none;
}
/* Listes */
.bullets{
  margin: 0 0 14px 18px;
  padding:0;
}
.bullets li{
  margin: 0 0 8px 0;
  font-size:18px;
  line-height:28px;
  color: var(--text);
}
/* Tableau conversions */
.table-wrap{
  overflow:auto;
  border:1px solid var(--border);
  background:#fff;
  margin-top:10px;
}
.conv-table{
  width:100%;
  border-collapse:collapse;
  min-width:520px;
}
.conv-table th,
.conv-table td{
  padding:10px 12px;
  border-bottom:1px solid var(--border);
  text-align:left;
  vertical-align:top;
}
.conv-table th{
  background:#f2f2f2;
  color: var(--text-strong);
  font-weight:700;
}
.conv-table tr:last-child td{ border-bottom:0; }
.surface-converters{
  margin-top:14px;
}
.surface-converters > p{
  margin-bottom:8px;
}
.conversion-links{
  display:grid;
  grid-template-columns:repeat(2, minmax(0, 1fr));
  gap:10px;
}
.conversion-links a{
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:50px;
  padding:12px;
  border:1px solid var(--border);
  background:var(--bg-soft-2);
  color:var(--text-strong);
  font-weight:700;
  text-align:center;
  text-decoration:none;
}
.conversion-links a:hover{
  background:#fff;
  border-color:var(--text-strong);
}
.conversion-links a:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
}
@media (max-width:600px){
  .conversion-links{
    grid-template-columns:1fr;
  }
}
.example{
  margin-top:16px;
}
/* Footer */
.site-footer{
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
  background:#fff;
  margin-top:40px;
}
.footer-wrap{
  max-width: var(--menu-w);
  margin:0 auto;
  padding:18px 16px;
  text-align:center;
}
.footer-line{
  margin:4px 0;
  font-size:14px !important;
  line-height:20px !important;
  color: var(--muted);
}
.site-footer a{
  color: var(--text-strong);
  text-decoration:none;
  font-weight:600;
}
.site-footer a:hover{
  text-decoration:underline;
}
/* Page cards (blocs de pages) */
.page-cards{
  display:grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap:12px;
}
.page-card{
  border:1px solid var(--border);
  background: var(--bg-soft-2);
  padding:14px 12px;
  cursor:pointer;
  text-align:center;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:10px;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
  text-decoration:none;
  color: inherit;
}
.page-card:hover{
  background:#fff;
  border-color: var(--text-strong);
  transform: translateY(-1px);
}
.page-card:focus{
  outline:none;
  box-shadow: 0 0 0 3px rgba(0,0,0,0.12);
  border-color: var(--text-strong);
}
/* état sélectionné (guide courant) */
.page-card.is-current{
  cursor: default;
  background:#fff;
  border-color: var(--text-strong);
  transform:none;
}
.page-card.is-current:hover{
  background:#fff;
  border-color: var(--text-strong);
  transform:none;
}
.page-card-icon{
  display:flex;
  align-items:center;
  justify-content:center;
  width:92px;
  height:92px;
}
.page-card-icon svg{
  width:92px;
  height:92px;
  display:block;
}
.page-card-title{
  margin:0 !important;
  font-size:16px !important;
  line-height:22px !important;
  font-weight:400;
  color: var(--text-strong);
}
/* CTA calculadora (guides) */
.cta-calculator{
  display:flex;
  align-items:center;
  gap:12px;
  padding:16px 16px;
  border:1px solid var(--border);
  background:#faf6f8;
  text-decoration:none;
  color: var(--text-strong);
  font-weight:800;
  font-size:20px;
  line-height:26px;
}
a.cta-calculator:hover{
  background:#fff;
  border-color: var(--text-strong);
}
a.cta-calculator:focus{
  outline:none;
  box-shadow: 0 0 0 3px rgba(0,0,0,0.12);
  border-color: var(--text-strong);
}
.cta-calculator-icon{
  width:28px;
  height:28px;
  display:flex;
  align-items:center;
  justify-content:center;
  flex: 0 0 auto;
}
.cta-calculator-icon svg{
  width:28px;
  height:28px;
  display:block;
}
.cta-calculator-copy{
  min-width:0;
}
.cta-calculator-text{
  color: var(--badge);
  text-decoration:none;
}
.cta-calculator-text:hover{ text-decoration:underline; }
.cta-calculator-suffix{
  display:inline-block;
  color: var(--muted);
  font-size:16px;
  font-weight:400;
}
/* Images des guides */
.guide-image{
  display:block;
  width:100%;
  height:auto;
  border:1px solid var(--border);
}
/* Responsive: 2 colonnes puis 1 colonne */
@media (max-width: 780px){
  .page-cards{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
/* Responsive */
@media (max-width: 780px){
  .sim-grid{ flex-direction:column; }
  .sim-left,.sim-right{ width:100%; }
  .diagram{ height:200px; }
  .diagram svg{ height:200px; }
  h1{ font-size:28px; line-height:36px; }
  .conv-table{ min-width:420px; }
  .badge{ padding:8px 10px; font-size:13px; }
  .cta-calculator{ font-size:18px; line-height:24px; }
}
@media (max-width: 420px){
  .page-cards{ grid-template-columns: 1fr; }
}
/* Accès aux outils complémentaires depuis les pages concernées. */
.page-card-paint,
.page-card-tiles{
  grid-column:1 / -1;
  flex-direction:row;
}
.page-card-paint .page-card-icon,
.page-card-tiles .page-card-icon{
  flex:0 0 92px;
}
/* Outils complémentaires affichés côte à côte sur l'accueil. */
.page-cards-home .page-card-tool{
  grid-column:span 2;
  flex-direction:row;
}
.page-cards-home .page-card-tool .page-card-icon{
  flex:0 0 92px;
}
/* Navigation entre les calculateurs de matériaux. */
.page-cards-tools .page-card-paint,
.page-cards-tools .page-card-tiles{
  grid-column:span 2;
  flex-direction:column;
}
@media (max-width:780px){
  .page-cards-home .page-card-tool{
    grid-column:span 1;
    flex-direction:column;
  }
  .page-cards-tools .page-card-paint,
  .page-cards-tools .page-card-tiles{
    grid-column:span 1;
  }
}