/* canyon.css — Thème : Strates rouges-ocre, grès, érosion, soleil couchant */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,600;0,700;1,500&family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');
:root {
  --sb:#1a0d08;--sb2:#221309;--surf:#2e1a10;--surf2:#3a2218;
  --ochre:#c8743d;--ochre2:#e09060;--ochre-p:rgba(224,144,96,.12);--ochre-d:rgba(224,144,96,.42);
  --rust:#a04228;--rust2:#c55c3c;--rust-p:rgba(197,92,60,.10);--rust-d:rgba(197,92,60,.4);
  --snd:#e8c78e;--snd2:#f0d9af;
  --dusk:#6b3a28;
  --ink:#f5e8d4;--ink2:rgba(245,232,212,.66);--ink3:rgba(245,232,212,.3);
  --brd:rgba(224,144,96,.22);--brdh:rgba(224,144,96,.46);
  --fd:'Playfair Display',Georgia,serif;--fb:'Inter',-apple-system,sans-serif;--fm:'JetBrains Mono',monospace;
  --sw:272px;--r:6px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}html{scroll-behavior:smooth;}
body{font-family:var(--fb);background:var(--sb);color:var(--ink);font-size:16.5px;line-height:1.85;
  background-image:
    radial-gradient(ellipse at 50% 0%,rgba(224,144,96,.20) 0,transparent 50%),
    radial-gradient(ellipse at 80% 70%,rgba(197,92,60,.12) 0,transparent 45%),
    repeating-linear-gradient(0deg,transparent 0,transparent 80px,rgba(197,92,60,.03) 80px,rgba(197,92,60,.03) 82px,transparent 82px,transparent 160px,rgba(224,144,96,.025) 160px,rgba(224,144,96,.025) 162px);
  background-attachment:fixed;position:relative;min-height:100vh;}
.progress-bar{position:fixed;top:0;left:0;height:4px;width:0%;background:linear-gradient(90deg,var(--rust2),var(--ochre2),var(--snd));z-index:200;transition:width .08s;box-shadow:0 0 10px rgba(224,144,96,.55);}
.page-layout{display:flex;min-height:100vh;position:relative;z-index:2;}
.sidebar{width:var(--sw);flex-shrink:0;background:linear-gradient(180deg,var(--sb2),var(--sb));border-right:1px solid var(--brd);position:sticky;top:0;height:100vh;overflow-y:auto;display:flex;flex-direction:column;scrollbar-width:thin;}
.sidebar-header{padding:28px 22px 22px;border-bottom:1px solid var(--brd);position:relative;background:repeating-linear-gradient(0deg,transparent 0,transparent 6px,rgba(224,144,96,.04) 6px,rgba(224,144,96,.04) 7px);}
.sidebar-header::after{content:'';position:absolute;bottom:-1px;left:22px;width:54px;height:2px;background:linear-gradient(90deg,var(--rust2),var(--ochre2));}
.sidebar-back{font-family:var(--fm);font-size:.6rem;letter-spacing:.14em;color:var(--ink3);text-decoration:none;display:block;margin-bottom:12px;}
.sidebar-back:hover{color:var(--ochre2);}
.sidebar-title{font-family:var(--fd);font-size:1.95rem;font-weight:700;color:var(--ochre2);line-height:1.0;letter-spacing:-.01em;}
.toc-nav{padding:10px 0 14px;flex:1;}
.toc-section-label{font-family:var(--fm);font-size:.58rem;letter-spacing:.22em;text-transform:uppercase;color:var(--ink3);padding:10px 22px 4px;}
.toc-link{display:block;padding:5px 22px 5px 26px;font-family:var(--fb);font-size:.83rem;color:var(--ink2);text-decoration:none;border-left:2px solid transparent;transition:all .18s;}
.toc-link:hover,.toc-link.active{color:var(--ochre2);border-left-color:var(--ochre2);background:var(--ochre-p);}
.sidebar-nav{padding:12px 22px;border-top:1px solid var(--brd);}
.sidebar-nav p{font-family:var(--fm);font-size:.56rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink3);margin-bottom:7px;margin-top:10px;}
.sidebar-nav p:first-child{margin-top:0;}
.sidebar-nav a{display:block;font-family:var(--fb);font-size:.8rem;color:var(--ink3);text-decoration:none;padding:2px 0;}
.sidebar-nav a:hover,.sidebar-nav a.current{color:var(--ochre2);}
.sidebar-nav a.current{font-weight:600;}
.main{flex:1;min-width:0;padding:0 58px 100px;max-width:840px;}
.page-header{padding:58px 0 38px;margin-bottom:50px;border-bottom:1px solid var(--brd);position:relative;}
.page-header::before{content:'';position:absolute;top:54px;right:0;width:110px;height:40px;opacity:.45;
  background:
    linear-gradient(180deg,var(--snd) 0 10%,var(--ochre2) 10% 28%,var(--rust2) 28% 52%,var(--dusk) 52% 72%,var(--rust) 72% 100%);
  border-radius:2px;
  filter:blur(.3px);}
.page-header::after{content:'';position:absolute;bottom:-1px;left:0;width:150px;height:2px;background:linear-gradient(90deg,var(--rust2),var(--ochre2),transparent);box-shadow:0 0 14px rgba(224,144,96,.45);}
.subject-tag{font-family:var(--fm);font-size:.62rem;letter-spacing:.22em;text-transform:uppercase;color:var(--ochre2);margin-bottom:12px;}
h1.page-title{font-family:var(--fd);font-size:3.7rem;font-weight:700;color:var(--ink);line-height:.98;letter-spacing:-.02em;}
h1.page-title .sub{color:var(--ochre2);font-size:1.05rem;display:block;margin-top:10px;font-family:var(--fd);font-style:italic;font-weight:500;letter-spacing:.02em;}
.page-intro{margin-top:17px;font-size:1rem;color:var(--ink2);font-style:italic;max-width:540px;}
.section{margin-bottom:60px;scroll-margin-top:26px;}
h2.section-title{font-family:var(--fd);font-size:2.05rem;font-weight:700;color:var(--ink);margin-bottom:22px;padding-bottom:9px;border-bottom:1px solid var(--brd);display:flex;align-items:baseline;gap:14px;}
h2.section-title .num{font-family:var(--fm);font-size:.7rem;color:var(--sb);background:var(--ochre2);padding:3px 11px;border-radius:3px;font-weight:500;box-shadow:0 0 8px rgba(224,144,96,.35);}
h3.sub-title{font-family:var(--fd);font-size:1.25rem;font-weight:700;color:var(--ochre2);margin:26px 0 11px;}
p{margin-bottom:.9em;}ul,ol{padding-left:1.4em;margin-bottom:.9em;}li{margin-bottom:.32em;}
strong{color:var(--snd2);font-weight:600;}em{color:var(--ochre2);}
.box{padding:16px 19px 14px;margin:16px 0;border-radius:var(--r);border:1px solid var(--brd);background:rgba(255,255,255,.03);}
.box-label{font-family:var(--fm);font-size:.62rem;font-weight:500;letter-spacing:.14em;text-transform:uppercase;display:block;margin-bottom:9px;}
.box.def{background:var(--ochre-p);border-color:var(--ochre-d);}.box.def .box-label{color:var(--ochre2);}
.box.histoire{background:var(--rust-p);border-left:4px solid var(--rust2);}.box.histoire .box-label{color:var(--rust2);}
.box.technique{background:rgba(139,200,220,.06);border-left:4px solid #7ca9bd;}.box.technique .box-label{color:#a0c6d4;}
.box.conseil{background:rgba(140,170,100,.07);border-left:4px solid #a3b574;}.box.conseil .box-label{color:#b8c888;}
.box.attention{background:rgba(255,120,50,.10);border-left:4px solid #e87838;}.box.attention .box-label{color:#ff9250;}
.box.chiffres{background:rgba(0,0,0,.35);border-color:var(--brdh);}.box.chiffres .box-label{color:var(--ochre2);}
.box.remark{background:transparent;border-left:3px solid var(--brd);padding-left:20px;}.box.remark .box-label{color:var(--ink3);}
.detail-toggle{display:inline-flex;align-items:center;gap:6px;font-family:var(--fb);font-size:.88rem;color:var(--ochre2);border:1px solid var(--ochre-d);padding:4px 14px;border-radius:3px;cursor:pointer;background:transparent;margin-top:8px;transition:all .18s;user-select:none;}
.detail-toggle:hover{background:var(--ochre2);color:var(--sb);}.detail-toggle .arrow{transition:transform .2s;}.detail-toggle.open .arrow{transform:rotate(90deg);}
.detail-content{max-height:0;overflow:hidden;transition:max-height .3s ease;}.detail-content.open{max-height:900px;}
.detail-inner{margin-top:10px;padding:13px 18px;background:rgba(0,0,0,.35);border:1px dashed var(--brd);border-radius:var(--r);color:var(--ink2);font-size:.93rem;}
.data-table{width:100%;border-collapse:collapse;margin:14px 0;font-size:.88rem;overflow:hidden;border:1px solid var(--brd);border-radius:var(--r);}
.data-table th{background:rgba(160,66,40,.55);color:var(--snd2);padding:10px 14px;text-align:left;font-family:var(--fm);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;border-bottom:1px solid var(--brdh);}
.data-table td{padding:9px 14px;border-bottom:1px solid var(--brd);vertical-align:top;}
.data-table tr:hover td{background:var(--ochre-p);}.data-table td:first-child{font-family:var(--fm);font-size:.8rem;color:var(--ochre2);}
code{font-family:var(--fm);font-size:.82em;background:rgba(0,0,0,.35);color:var(--ochre2);padding:2px 6px;border-radius:3px;border:1px solid var(--brd);}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:14px 0;}.two-col .box{margin:0;}
.mobile-header{display:none;position:sticky;top:0;z-index:50;background:var(--sb2);border-bottom:2px solid var(--rust2);padding:12px 18px;align-items:center;justify-content:space-between;}
.mobile-menu-btn{background:none;border:none;color:var(--ochre2);font-size:1.3rem;cursor:pointer;}
.mobile-title{font-family:var(--fd);font-size:1.1rem;color:var(--ochre2);font-weight:700;}
.mobile-drawer{display:none;position:fixed;inset:0;z-index:100;}.mobile-drawer.open{display:flex;}
.drawer-overlay{position:absolute;inset:0;background:rgba(0,0,0,.78);}
.drawer-panel{position:relative;z-index:1;width:272px;background:var(--sb2);height:100%;overflow-y:auto;padding:14px 0;border-right:1px solid var(--brd);}
@media(max-width:960px){.sidebar{display:none;}.mobile-header{display:flex;}.main{padding:0 20px 70px;}h1.page-title{font-size:2.55rem;}.two-col{grid-template-columns:1fr;}}