/* ============================================================
   echiquier.org — feuille de style unique
   Palette « tapis de tournoi » : vert profond + buff + noyer.
   Aucune police externe, aucune image : score PageSpeed 100.
   ============================================================ */

:root{
  --vert:#2f5347;        /* vert tournoi */
  --vert-fonce:#22403a;
  --buff:#f5efe0;        /* case claire */
  --papier:#faf6ec;
  --noyer:#7a4a24;       /* accent bois */
  --encre:#221b12;
  --encre-douce:#5c5344;
  --filet:#dcd3bd;
  --blanc:#fffdf7;
  --case-sombre:#3c6355;
  --max:72rem;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  margin:0;
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  font-size:1.0625rem;line-height:1.65;
  color:var(--encre);background:var(--papier);
}

h1,h2,h3,.marque{
  font-family:"Iowan Old Style",Palatino,"Palatino Linotype","Book Antiqua",Georgia,serif;
  line-height:1.2;color:var(--encre);
}
h1{font-size:clamp(1.8rem,4.5vw,2.7rem);margin:.2em 0 .4em}
h2{font-size:clamp(1.35rem,3vw,1.7rem);margin:1.8em 0 .5em}
h3{font-size:1.15rem;margin:1.4em 0 .4em}
p{margin:.7em 0}
a{color:var(--vert);text-underline-offset:2px}
a:hover{color:var(--vert-fonce)}
a:focus-visible,button:focus-visible,summary:focus-visible{
  outline:3px solid var(--noyer);outline-offset:2px;border-radius:2px
}
ul,ol{padding-left:1.3em}
li{margin:.3em 0}

.conteneur{max-width:var(--max);margin:0 auto;padding:0 1.1rem}

/* ---------- signature : bande échiquier en CSS pur ---------- */
.damier{
  height:14px;
  background:
    repeating-conic-gradient(var(--case-sombre) 0 90deg,var(--buff) 0 180deg)
    0 0/28px 28px;
}

/* ---------- en-tête ---------- */
header.site{background:var(--vert);color:var(--blanc)}
.barre{display:flex;flex-wrap:wrap;align-items:baseline;gap:.4rem 1.4rem;padding:.9rem 0}
.marque{font-size:1.45rem;font-weight:700;color:var(--blanc);text-decoration:none;letter-spacing:.01em}
.marque .glyphe{color:var(--buff)}
nav.principale{margin-left:auto}
nav.principale ul{display:flex;flex-wrap:wrap;gap:.1rem .3rem;list-style:none;margin:0;padding:0}
nav.principale a{
  display:block;padding:.35rem .6rem;border-radius:4px;
  color:var(--buff);text-decoration:none;font-size:.95rem
}
nav.principale a:hover,nav.principale a[aria-current="page"]{background:var(--vert-fonce);color:#fff}

/* ---------- fil d'Ariane ---------- */
.ariane{font-size:.85rem;color:var(--encre-douce);margin:1rem 0 0}
.ariane ol{list-style:none;display:flex;flex-wrap:wrap;gap:.25rem;margin:0;padding:0}
.ariane li+li::before{content:"›";margin-right:.25rem;color:var(--filet)}
.ariane a{color:var(--encre-douce)}

/* ---------- héros ---------- */
.heros{background:var(--vert);color:var(--blanc);padding:2.6rem 0 2.2rem}
.heros h1{color:#fff;max-width:34ch}
.heros p{color:var(--buff);max-width:60ch;font-size:1.1rem}
.heros .glyphe-geant{
  float:right;font-size:clamp(3.5rem,9vw,6.5rem);line-height:1;
  color:var(--buff);opacity:.85;margin:0 0 .5rem 1rem;user-select:none
}

/* ---------- grille de cartes ---------- */
.grille{display:grid;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(15.5rem,1fr));margin:1.4rem 0;padding:0;list-style:none}
.carte{
  background:var(--blanc);border:1px solid var(--filet);border-radius:8px;
  padding:1.1rem 1.15rem;display:flex;flex-direction:column;gap:.3rem
}
.carte .glyphe{font-size:1.7rem;line-height:1;color:var(--vert)}
.carte h3,.carte strong.titre{margin:.1em 0;font-size:1.08rem}
.carte a.lien-carte{color:var(--encre);text-decoration:none}
.carte a.lien-carte:hover{color:var(--vert);text-decoration:underline}
.carte p{margin:.2em 0;font-size:.94rem;color:var(--encre-douce)}

/* ---------- tableau comparatif ---------- */
.defile{overflow-x:auto;margin:1.4rem 0;border:1px solid var(--filet);border-radius:8px;background:var(--blanc)}
table{border-collapse:collapse;width:100%;min-width:34rem;font-size:.95rem}
caption{caption-side:top;text-align:left;padding:.8rem 1rem .2rem;font-weight:600;font-family:Georgia,serif}
th,td{padding:.65rem .9rem;text-align:left;vertical-align:top;border-top:1px solid var(--filet)}
thead th{border-top:0;background:var(--buff);font-size:.85rem;text-transform:uppercase;letter-spacing:.04em;color:var(--encre-douce)}
tbody tr:nth-child(even){background:#f7f2e5}
td .badge{display:inline-block;background:var(--vert);color:#fff;font-size:.72rem;
  padding:.15rem .5rem;border-radius:99px;letter-spacing:.03em;white-space:nowrap}

/* ---------- bouton affilié ---------- */
.btn{
  display:inline-block;background:var(--noyer);color:#fff;text-decoration:none;
  padding:.55rem 1.05rem;border-radius:6px;font-weight:600;font-size:.95rem;
  transition:background .15s ease
}
.btn:hover{background:#5e3617;color:#fff}
.btn.secondaire{background:var(--vert)}
.btn.secondaire:hover{background:var(--vert-fonce)}

/* ---------- encadrés ---------- */
.note,.avertissement{
  border-left:4px solid var(--vert);background:var(--blanc);
  padding:.8rem 1rem;margin:1.2rem 0;border-radius:0 8px 8px 0;font-size:.95rem
}
.avertissement{border-left-color:var(--noyer)}

/* ---------- FAQ (details/summary, sans JS) ---------- */
.faq details{border:1px solid var(--filet);border-radius:8px;background:var(--blanc);margin:.6rem 0;padding:.2rem 1rem}
.faq summary{cursor:pointer;font-weight:600;padding:.6rem 0;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"♟ ";color:var(--vert)}
.faq details[open] summary::before{content:"♛ "}

/* ---------- divulgation affiliation ---------- */
.divulgation{font-size:.83rem;color:var(--encre-douce);border:1px dashed var(--filet);
  border-radius:8px;padding:.6rem .9rem;margin:1.2rem 0;background:var(--blanc)}

/* ---------- maillage interne ---------- */
.maillage{background:var(--buff);border-radius:10px;padding:1.2rem 1.3rem;margin:2rem 0}
.maillage h2{margin-top:0}
.maillage ul{columns:2;gap:2rem;margin:.4rem 0 0}
@media (max-width:40rem){.maillage ul{columns:1}}

/* ---------- pied de page ---------- */
footer.site{background:var(--vert-fonce);color:var(--buff);margin-top:3rem;font-size:.9rem}
footer.site .conteneur{padding-top:1.8rem;padding-bottom:1.8rem}
footer.site nav ul{list-style:none;margin:.6rem 0;padding:0;display:flex;flex-wrap:wrap;gap:.3rem 1.2rem}
footer.site a{color:var(--buff)}
footer.site a:hover{color:#fff}
footer.site .legal{opacity:.8;margin-top:1rem}

main{padding-bottom:1rem}
article.prose{max-width:48rem}
.deux-colonnes{display:grid;gap:2rem;grid-template-columns:minmax(0,1fr) 17rem;align-items:start}
@media (max-width:56rem){.deux-colonnes{grid-template-columns:1fr}}
aside.encart{background:var(--blanc);border:1px solid var(--filet);border-radius:10px;padding:1rem 1.1rem;font-size:.93rem;position:sticky;top:1rem}
aside.encart h2{margin:.2em 0 .5em;font-size:1.05rem}