/* SabotCharpente.com — feuille de style
   Concept : une fiche technique de quincaillerie de charpente. Colonne de lecture étroite,
   colonne latérale "spécifications" à gauche, cotes et références en caractères machine. */

@font-face{font-family:"Big Shoulders Display";src:url(fonts/big-shoulders-display-latin-900-normal.woff2) format("woff2");font-weight:900;font-display:swap}
@font-face{font-family:"Big Shoulders Display";src:url(fonts/big-shoulders-display-latin-700-normal.woff2) format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"Literata";src:url(fonts/literata-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Literata";src:url(fonts/literata-latin-600-normal.woff2) format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Literata";src:url(fonts/literata-latin-400-italic.woff2) format("woff2");font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(fonts/ibm-plex-mono-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2");font-weight:500;font-display:swap}

:root{
  --zinc:#EEF1F0;        /* fond : tôle galvanisée */
  --sheet:#FFFFFF;       /* feuille */
  --ink:#15201E;
  --muted:#56625F;
  --rule:#C9D1CF;
  --timber:#A5591A;      /* bois de charpente (accent) */
  --timber-soft:#F4E5D2;
  --steel:#2F5D66;       /* acier du sabot */
  --steel-soft:#DDE8EA;
  --display:"Big Shoulders Display","Arial Narrow","Roboto Condensed",Impact,sans-serif;
  --body:"Literata",Georgia,"Times New Roman",serif;
  --mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Consolas,monospace;
  --measure:66ch;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --zinc:#111716;--sheet:#182120;--ink:#E4EAE8;--muted:#9AA7A4;--rule:#2E3B39;
  --timber:#E39A52;--timber-soft:#2C2117;--steel:#86B6C0;--steel-soft:#1B2B2E;color-scheme:dark}}
:root[data-theme="dark"]{
  --zinc:#111716;--sheet:#182120;--ink:#E4EAE8;--muted:#9AA7A4;--rule:#2E3B39;
  --timber:#E39A52;--timber-soft:#2C2117;--steel:#86B6C0;--steel-soft:#1B2B2E;color-scheme:dark}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--zinc);color:var(--ink);font:400 1.0625rem/1.7 var(--body)}
img,svg{max-width:100%;height:auto}
a{color:var(--steel);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{color:var(--timber)}
:focus-visible{outline:3px solid var(--timber);outline-offset:2px}
.wrap{max-width:1120px;margin-inline:auto;padding-inline:clamp(16px,4vw,32px)}
.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:16px;background:var(--sheet);padding:8px 12px;z-index:9}

/* En-tête */
.site-head{background:var(--sheet);border-bottom:1px solid var(--rule)}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px 24px;flex-wrap:wrap;padding-block:14px}
.brand img{display:block;height:48px;width:auto}
.nav{display:flex;flex-wrap:wrap;gap:4px 20px;font:500 .8rem/1.4 var(--mono);letter-spacing:.04em;text-transform:uppercase}
.nav a{color:var(--ink);text-decoration:none;padding-block:4px;border-bottom:2px solid transparent}
.nav a:hover,.nav a[aria-current]{border-bottom-color:var(--timber);color:var(--ink)}
.brand .logo-dark{display:none}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .brand .logo-light{display:none}:root:not([data-theme="light"]) .brand .logo-dark{display:block}}
:root[data-theme="dark"] .brand .logo-light{display:none}:root[data-theme="dark"] .brand .logo-dark{display:block}

.disclosure-bar{background:var(--timber-soft);color:var(--ink);font:400 .78rem/1.5 var(--mono)}
.disclosure-bar .wrap{padding-block:7px}

/* Typo */
h1,h2,h3{font-family:var(--display);line-height:1.02;text-wrap:balance;margin:0}
h1{font-weight:900;font-size:clamp(2.6rem,6.5vw,4.6rem);text-transform:uppercase;letter-spacing:.005em}
h2{font-weight:900;font-size:clamp(1.8rem,3.6vw,2.4rem);text-transform:uppercase;margin-top:2.4em;margin-bottom:.5em}
h3{font-weight:700;font-size:1.45rem;margin-top:1.8em;margin-bottom:.35em}
p,ul,ol{margin:0 0 1.05em}
li{margin-bottom:.35em}
strong{font-weight:600}
.eyebrow{font:500 .78rem/1.3 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--timber);margin:0 0 .8em}
.lede{font-size:1.2rem;line-height:1.6;color:var(--ink);max-width:var(--measure)}
.meta{font:400 .8rem/1.5 var(--mono);color:var(--muted)}
.meta a{color:var(--muted)}
code,.ref{font-family:var(--mono);font-size:.88em;background:var(--steel-soft);padding:.05em .35em;border-radius:3px}

/* Héros */
.hero{background:var(--sheet);border-bottom:1px solid var(--rule)}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:clamp(24px,5vw,64px);align-items:center;padding-block:clamp(36px,6vw,72px)}
.hero h1 span{color:var(--timber)}
.hero .lede{margin-top:1em}
.hero figure{margin:0}
.hero figcaption,.fig figcaption{font:400 .75rem/1.5 var(--mono);color:var(--muted);margin-top:8px}
.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:1.4em}
.btn{display:inline-block;font:500 .85rem/1 var(--mono);letter-spacing:.03em;text-decoration:none;padding:13px 18px;border:2px solid var(--ink);color:var(--ink);background:transparent}
.btn:hover{background:var(--ink);color:var(--sheet)}
.btn.primary{background:var(--timber);border-color:var(--timber);color:#fff}
.btn.primary:hover{background:var(--ink);border-color:var(--ink);color:var(--sheet)}

/* Schémas (SVG en ligne) */
.dg-steel{fill:var(--steel)} .dg-wood{fill:var(--timber-soft);stroke:var(--timber);stroke-width:1.5}
.dg-ring{fill:none;stroke:var(--timber);stroke-width:1.2;opacity:.7}
.dg-support{fill:var(--zinc);stroke:var(--rule);stroke-width:1}
.dg-hole{fill:var(--sheet)} .dg-nail{fill:var(--timber)}
.dg-dim{stroke:var(--ink);stroke-width:1;fill:none} .dg-arrow{fill:var(--ink)}
.dg-txt{font:500 11px var(--mono);fill:var(--ink)} .dg-txt.m{fill:var(--muted)} .dg-txt.a{fill:var(--timber)}

/* Mise en page article */
.article{padding-block:clamp(32px,5vw,56px)}
.article .wrap{display:grid;grid-template-columns:230px minmax(0,1fr);gap:clamp(24px,4vw,56px);align-items:start}
.article-head{grid-column:1/-1;max-width:880px}
.article-head .meta{margin-top:1.1em}
.side{position:sticky;top:20px;font:400 .82rem/1.55 var(--mono);border-top:3px solid var(--ink);padding-top:12px}
.side h2{font:500 .72rem/1.3 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:0 0 8px}
.side ol{list-style:none;padding:0;margin:0 0 20px;counter-reset:t}
.side li{margin:0;border-bottom:1px solid var(--rule)}
.side li a{display:block;padding:7px 0;color:var(--ink);text-decoration:none}
.side li a:hover{color:var(--timber)}
.side dl{display:grid;grid-template-columns:auto 1fr;gap:4px 10px;margin:0}
.side dt{color:var(--muted)} .side dd{margin:0}
.body{min-width:0;max-width:var(--measure)}
.body > h2:first-child{margin-top:0}
.body ul,.body ol{padding-left:1.25em}

/* Réponse courte (extrait optimisé) */
.answer{background:var(--sheet);border:1px solid var(--rule);border-left:6px solid var(--timber);padding:18px 22px;margin:0 0 1.6em}
.answer .eyebrow{margin-bottom:.4em}
.answer p:last-child{margin-bottom:0}

.note{background:var(--steel-soft);padding:14px 18px;margin:1.4em 0;font-size:.97rem}
.note > strong:first-child{font-family:var(--mono);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;display:block;color:var(--steel);margin-bottom:4px}
.note p:last-child{margin-bottom:0}

.fig{margin:1.6em 0;background:var(--sheet);border:1px solid var(--rule);padding:16px}
.fig svg{display:block;margin-inline:auto}

/* Tableaux techniques */
.table-scroll{overflow-x:auto;margin:1.4em 0;border:1px solid var(--rule);background:var(--sheet)}
table{border-collapse:collapse;width:100%;font:400 .86rem/1.45 var(--mono);font-variant-numeric:tabular-nums}
th,td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--rule);vertical-align:top}
th{font-weight:500;background:var(--steel-soft);color:var(--ink);white-space:nowrap}
tr:last-child td{border-bottom:0}

/* Étapes */
.steps{list-style:none;padding:0!important;counter-reset:s}
.steps > li{counter-increment:s;position:relative;padding:0 0 1.1em 3.1em;margin:0}
.steps > li::before{content:counter(s,decimal-leading-zero);position:absolute;left:0;top:.1em;font:900 1.55rem/1 var(--display);color:var(--timber)}
.steps > li strong:first-child{display:block;font-family:var(--display);font-size:1.25rem;font-weight:700;letter-spacing:.01em}

/* FAQ */
.faq details{border-bottom:1px solid var(--rule);padding:12px 0}
.faq summary{cursor:pointer;font-weight:600;list-style-position:outside}
.faq details p{margin:.6em 0 0}

/* Grille de guides (accueil) */
.guides{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:1.4em 0 0}
.guide{display:flex;flex-direction:column;gap:8px;background:var(--sheet);border:1px solid var(--rule);padding:20px;text-decoration:none;color:var(--ink)}
.guide:hover{border-color:var(--ink);color:var(--ink)}
.guide .k{font:500 .72rem/1.3 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--timber)}
.guide h3{margin:0;font-size:1.55rem}
.guide p{margin:0;font-size:.95rem;color:var(--muted)}

/* Produits (comparatif) */
.pick{background:var(--sheet);border:1px solid var(--rule);margin:1.4em 0;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 20px;padding:20px 22px}
.pick h3{margin:0;grid-column:1/-1}
.pick .tag{font:500 .72rem/1.3 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--timber);grid-column:1/-1;margin-bottom:4px}
.pick p,.pick ul{grid-column:1/-1;margin-bottom:.6em}
.pick .specs{font:400 .82rem/1.5 var(--mono);color:var(--muted)}
.pick .btn{justify-self:start;grid-column:1/-1;margin-top:6px}

/* Calculateur */
.calc{background:var(--sheet);border:2px solid var(--ink);padding:20px 22px;margin:1.6em 0}
.calc form{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;align-items:end}
.calc label{display:flex;flex-direction:column;gap:6px;font:500 .75rem/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.calc input,.calc select{font:500 1.05rem/1.2 var(--mono);padding:10px;border:1px solid var(--rule);background:var(--zinc);color:var(--ink);width:100%}
.calc output{display:block;margin-top:16px;font:400 .95rem/1.6 var(--mono);border-top:1px solid var(--rule);padding-top:14px}
.calc output b{font-weight:500;color:var(--timber)}

/* Pied de page */
.site-foot{background:#15201E;color:#C9D3D1;margin-top:56px;font:400 .82rem/1.6 var(--mono)}
.site-foot .wrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px;padding-block:40px}
.site-foot h2{font:500 .72rem/1.3 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:#E39A52;margin:0 0 10px}
.site-foot a{color:#E6ECEA;text-decoration:none}
.site-foot a:hover{text-decoration:underline;color:#fff}
.site-foot ul{list-style:none;padding:0;margin:0}
.site-foot .fine{grid-column:1/-1;border-top:1px solid #2E3B39;padding-top:18px;color:#9AA7A4}

.page{padding-block:clamp(32px,5vw,56px)}
.page .body{max-width:var(--measure)}
.page h1{margin-bottom:.4em}

@media (max-width:860px){
  .hero .wrap,.article .wrap{grid-template-columns:minmax(0,1fr)}
  .side{position:static}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
html{scroll-behavior:smooth}
.dg-block{fill:var(--rule);stroke:var(--muted);stroke-width:1}

/* ===== v2 : mobile, menu, images 3D ===== */
[hidden]{display:none!important}
html{scroll-padding-top:16px}
.nav-toggle{display:none}
.nav-sub{display:none}
.cover{grid-column:1/-1;max-width:880px;margin:0;background:var(--sheet);border:1px solid var(--rule)}
.cover img{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover}
.cover figcaption,.render figcaption,.viewer3d figcaption{font:400 .75rem/1.5 var(--mono);color:var(--muted);padding:8px 14px 10px;border-top:1px solid var(--rule)}
.render{margin:1.6em 0;background:var(--sheet);border:1px solid var(--rule)}
.render img{display:block;width:100%;height:auto}
.hero .render{margin:0}

/* Visionneuse 3D */
.viewer3d{margin:1.6em 0;background:var(--sheet);border:1px solid var(--rule)}
.v3d-stage{position:relative;aspect-ratio:16/10;overflow:hidden;background:radial-gradient(120% 90% at 50% 35%,var(--sheet),var(--zinc))}
.v3d-stage img{display:block;width:100%;height:100%;object-fit:cover}
.v3d-stage.is-3d img{display:none}
.v3d-canvas{position:absolute;inset:0;width:100%!important;height:100%!important;touch-action:none;cursor:grab}
.v3d-canvas:active{cursor:grabbing}
.v3d-start{position:absolute;left:50%;bottom:16px;transform:translateX(-50%);display:inline-flex;align-items:center;gap:8px;font:500 .85rem/1 var(--mono);letter-spacing:.03em;padding:13px 18px;min-height:44px;border:0;background:var(--ink);color:var(--sheet);cursor:pointer;box-shadow:0 6px 18px rgba(0,0,0,.18)}
.v3d-start:hover{background:var(--timber);color:#fff}
.v3d-start svg{width:18px;height:18px}
.v3d-reset{position:absolute;right:10px;top:10px;font:500 .72rem/1 var(--mono);padding:9px 11px;min-height:36px;border:1px solid var(--rule);background:var(--sheet);color:var(--ink);cursor:pointer}
.v3d-hint{position:absolute;left:12px;top:12px;margin:0;font:400 .72rem/1.3 var(--mono);color:var(--muted);background:color-mix(in srgb,var(--sheet) 80%,transparent);padding:5px 8px;pointer-events:none}
.v3d-tabs{display:flex;flex-wrap:wrap;gap:6px;padding:10px 12px;border-top:1px solid var(--rule)}
.v3d-tabs button{font:500 .75rem/1 var(--mono);letter-spacing:.03em;padding:10px 12px;min-height:40px;border:1px solid var(--rule);background:transparent;color:var(--ink);cursor:pointer}
.v3d-tabs button[aria-pressed="true"]{background:var(--steel);border-color:var(--steel);color:#fff}

/* Sommaire repliable */
details.toc summary{list-style:none;cursor:default}
details.toc summary::-webkit-details-marker{display:none}
details.toc summary h2{display:inline}

/* Tableaux : indice de défilement */
.table-scroll{-webkit-overflow-scrolling:touch;background:linear-gradient(90deg,var(--sheet) 30%,transparent) left/40px 100% no-repeat local,linear-gradient(270deg,var(--sheet) 30%,transparent) right/40px 100% no-repeat local,radial-gradient(farthest-side at 0 50%,rgba(0,0,0,.14),transparent) left/12px 100% no-repeat scroll,radial-gradient(farthest-side at 100% 50%,rgba(0,0,0,.14),transparent) right/12px 100% no-repeat scroll,var(--sheet)}

@media (max-width:860px){
  html{scroll-padding-top:72px}
  .site-head{position:sticky;top:0;z-index:20}
  .site-head .wrap{flex-wrap:nowrap;padding-block:8px;min-height:60px}
  .brand img{height:38px}
  .js .nav-toggle{display:inline-flex;align-items:center;justify-content:center;gap:8px;width:48px;height:48px;margin-right:-8px;border:0;background:transparent;color:var(--ink);cursor:pointer;flex:none}
  .nav-toggle .bars,.nav-toggle .bars::before,.nav-toggle .bars::after{display:block;width:22px;height:2px;background:currentColor;transition:transform .2s,opacity .2s;position:relative}
  .nav-toggle .bars::before,.nav-toggle .bars::after{content:"";position:absolute;left:0}
  .nav-toggle .bars::before{top:-7px}.nav-toggle .bars::after{top:7px}
  .menu-open .nav-toggle .bars{background:transparent}
  .menu-open .nav-toggle .bars::before{transform:translateY(7px) rotate(45deg)}
  .menu-open .nav-toggle .bars::after{transform:translateY(-7px) rotate(-45deg)}
  .js .nav{position:fixed;left:0;right:0;top:60px;bottom:0;z-index:19;display:flex;flex-direction:column;flex-wrap:nowrap;gap:0;padding:8px clamp(16px,4vw,32px) 32px;background:var(--sheet);border-top:1px solid var(--rule);overflow-y:auto;overscroll-behavior:contain;font-size:.95rem;visibility:hidden;opacity:0;transform:translateY(-8px);transition:opacity .18s,transform .18s,visibility 0s .18s}
  .menu-open .nav{visibility:visible;opacity:1;transform:none;transition:opacity .18s,transform .18s}
  .js .nav a{display:flex;align-items:center;min-height:52px;padding:0;border-bottom:1px solid var(--rule)}
  .js .nav a[aria-current]{color:var(--timber);border-bottom-color:var(--rule)}
  .js .nav-sub{display:block;margin-top:22px}
  .nav-sub span{display:block;font-size:.72rem;letter-spacing:.1em;color:var(--muted);margin-bottom:4px}
  .menu-open body{overflow:hidden}
  .nav{gap:2px 16px}
  .disclosure-bar{font-size:.68rem;line-height:1.4}
  .disclosure-bar .wrap{padding-block:5px}

  .hero .wrap{padding-block:28px 36px}
  h1{font-size:clamp(2.15rem,9vw,3rem)}
  h2{font-size:clamp(1.6rem,7vw,2rem);margin-top:2em}
  .lede{font-size:1.08rem}
  body{font-size:1.03rem}
  .side{border-top-width:2px;padding-top:0}
  details.toc{border-bottom:1px solid var(--rule);margin-bottom:14px}
  details.toc summary{cursor:pointer;display:flex;align-items:center;justify-content:space-between;min-height:48px}
  details.toc summary::after{content:"+";font:500 1.2rem/1 var(--mono);color:var(--timber)}
  details.toc[open] summary::after{content:"–"}
  details.toc summary h2{margin:0;font-size:.78rem;color:var(--ink)}
  .side li a{padding:11px 0}
  .side dl{grid-template-columns:auto 1fr;font-size:.78rem}
  .answer{padding:14px 16px}
  .fig{padding:10px}
  .btn-row .btn{flex:1 1 220px;text-align:center;padding-block:15px}
  .pick{padding:16px}
  .pick .btn{justify-self:stretch;text-align:center}
  .calc{padding:16px}
  .faq summary{padding:6px 0;min-height:44px}
  .site-foot li a{display:inline-block;padding:7px 0}
  .v3d-stage{aspect-ratio:4/3}
  .v3d-tabs{overflow-x:auto;flex-wrap:nowrap}
  .v3d-tabs button{flex:none}
  .cover{margin-inline:calc(-1 * clamp(16px,4vw,32px));border-inline:0}
}
@media (max-width:420px){
  .table-scroll table{font-size:.8rem}
  th,td{padding:8px 9px}
}
@media (prefers-reduced-motion:reduce){.js .nav{transition:none}}
@media (max-width:480px){.v3d-hint{right:104px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}}
/* À lire aussi */
.related{margin:2.2em 0 0;padding:16px 20px;background:var(--sheet);border:1px solid var(--rule);border-top:3px solid var(--steel)}
.related .eyebrow{color:var(--steel);margin-bottom:.5em}
.related ul{list-style:none;padding:0!important;margin:0}
.related li{margin:0;border-bottom:1px solid var(--rule)}
.related li:last-child{border-bottom:0}
.related a{display:block;padding:9px 0;text-decoration:none;font-weight:600}
.related a::after{content:" →";color:var(--timber)}
.body > .related + h2{margin-top:1.6em}
/* Photos des cartes et des liens « À lire aussi » */
.guide{overflow:hidden}
.guide img{display:block;width:calc(100% + 40px);max-width:none;margin:-20px -20px 6px;aspect-ratio:16/10;height:auto;object-fit:cover;background:radial-gradient(120% 90% at 50% 35%,var(--sheet),var(--zinc));border-bottom:1px solid var(--rule);transition:transform .25s}
.guide:hover img{transform:scale(1.03)}
.related a{display:flex;align-items:center;gap:14px}
.related a img{flex:none;width:96px;height:60px;object-fit:cover;border:1px solid var(--rule);background:var(--zinc)}
.related a span{flex:1}
@media (prefers-reduced-motion:reduce){.guide img{transition:none}}
/* Sources */
.sources{margin:2.2em 0 0;padding:14px 20px;border:1px dashed var(--rule);background:var(--zinc);font-size:.92rem}
.sources .eyebrow{color:var(--muted);margin-bottom:.4em}
.sources ul{margin:0 0 .6em;padding-left:1.1em}
.sources li{margin-bottom:.3em}
.sources .src-by{color:var(--muted);font:400 .8rem/1.4 var(--mono)}
.sources .meta{margin:0}
.sources + .related{margin-top:1.2em}