/* volcan.css — Thème : Rouge lave incandescent, noir basalte, orange magmatique, fissures de feu */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,700;0,900;1,700&family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');
:root {
  --sb:#0a0605;--sb2:#110907;--surf:#1a0e0a;--surf2:#241410;
  --lava:#ff4a1f;--lava2:#ff7a3e;--lava-d:#c43608;--lava-p:rgba(255,74,31,.14);--lava-dd:rgba(255,74,31,.50);
  --gold:#f7a84e;--gold2:#ffc172;--gold-p:rgba(247,168,78,.10);--gold-d:rgba(247,168,78,.42);
  --ash:#8c8178;--ash-p:rgba(140,129,120,.12);
  --ink:#f0dbc4;--ink2:rgba(240,219,196,.66);--ink3:rgba(240,219,196,.30);
  --brd:rgba(255,120,60,.14);--brdh:rgba(255,120,60,.35);
  --fd:'Playfair Display',Georgia,serif;--fb:'Inter',-apple-system,sans-serif;--fm:'JetBrains Mono',monospace;
  --sw:272px;--r:3px;
}
*,*::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:1.8;
  background-image:
    radial-gradient(ellipse at 28% 0%,rgba(255,74,31,.22) 0,transparent 48%),
    radial-gradient(ellipse at 100% 100%,rgba(247,168,78,.12) 0,transparent 45%),
    radial-gradient(ellipse at 50% 65%,rgba(196,54,8,.08) 0,transparent 55%),
    linear-gradient(180deg,#1a0e0a 0%,#0a0605 100%);
  background-attachment:fixed;position:relative;min-height:100vh;}
/* veines de lave décoratives */
body::before{content:'';position:fixed;top:-10%;left:-5%;width:60%;height:40%;pointer-events:none;z-index:1;opacity:.5;
  background:
    linear-gradient(130deg,transparent 48%,rgba(255,74,31,.6) 49%,rgba(255,122,62,.8) 50%,rgba(255,74,31,.6) 51%,transparent 52%),
    linear-gradient(140deg,transparent 70%,rgba(255,122,62,.4) 71%,transparent 73%);
  filter:blur(1.5px);}
body::after{content:'';position:fixed;bottom:-20%;right:-10%;width:70%;height:50%;pointer-events:none;z-index:1;opacity:.35;
  background:
    linear-gradient(35deg,transparent 65%,rgba(247,168,78,.45) 66%,rgba(255,122,62,.6) 67%,transparent 68%),
    linear-gradient(55deg,transparent 80%,rgba(255,74,31,.4) 81%,transparent 83%);
  filter:blur(2px);}
.progress-bar{position:fixed;top:0;left:0;height:4px;width:0%;background:linear-gradient(90deg,var(--lava),var(--gold),var(--lava2));z-index:200;transition:width .08s;box-shadow:0 0 16px rgba(255,74,31,.7);}
.page-layout{display:flex;min-height:100vh;position:relative;z-index:2;}
.sidebar{width:var(--sw);flex-shrink:0;background:rgba(10,6,5,.92);backdrop-filter:blur(10px);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:34px 22px 24px;border-bottom:1px solid var(--brd);position:relative;background:linear-gradient(135deg,transparent,rgba(255,74,31,.06));}
.sidebar-header::after{content:'';position:absolute;bottom:-1px;left:22px;width:72px;height:2px;background:linear-gradient(90deg,var(--lava),var(--gold),transparent);box-shadow:0 0 8px rgba(255,74,31,.6);}
.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(--lava2);}
.sidebar-title{font-family:var(--fd);font-size:2.25rem;font-weight:900;color:var(--lava2);line-height:1.0;letter-spacing:-.015em;text-shadow:0 0 24px rgba(255,74,31,.5);}
.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:.82rem;color:var(--ink2);text-decoration:none;border-left:2px solid transparent;transition:all .18s;}
.toc-link:hover,.toc-link.active{color:var(--lava2);border-left-color:var(--lava);background:var(--lava-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(--gold);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(--lava2);}
.sidebar-nav a.current{font-weight:700;}
.main{flex:1;min-width:0;padding:0 58px 100px;max-width:840px;}
.page-header{padding:62px 0 40px;margin-bottom:50px;border-bottom:1px solid var(--brd);position:relative;}
.page-header::before{content:'';position:absolute;top:66px;right:8px;width:120px;height:120px;
  background:radial-gradient(circle at 50% 30%,var(--lava2) 0%,var(--lava) 35%,var(--lava-d) 60%,transparent 78%);
  border-radius:50% 50% 44% 56% / 60% 60% 40% 40%;opacity:.45;filter:blur(2px);
  box-shadow:0 0 60px rgba(255,74,31,.4);}
.subject-tag{font-family:var(--fm);font-size:.62rem;letter-spacing:.22em;text-transform:uppercase;color:var(--lava);margin-bottom:12px;}
h1.page-title{font-family:var(--fd);font-size:4.4rem;font-weight:900;color:var(--ink);line-height:.98;letter-spacing:-.028em;text-shadow:0 0 40px rgba(255,74,31,.3);}
h1.page-title .sub{color:var(--gold);font-size:1.08rem;display:block;margin-top:12px;font-family:var(--fb);font-weight:400;letter-spacing:.04em;text-shadow:none;}
.page-intro{margin-top:18px;font-size:1rem;color:var(--ink2);max-width:560px;}
.section{margin-bottom:60px;scroll-margin-top:26px;}
h2.section-title{font-family:var(--fd);font-size:2.3rem;font-weight:900;color:var(--lava2);margin-bottom:22px;padding-bottom:9px;border-bottom:1px solid var(--brd);display:flex;align-items:baseline;gap:14px;letter-spacing:-.015em;}
h2.section-title .num{font-family:var(--fm);font-weight:500;font-size:.7rem;color:var(--sb);background:var(--gold);padding:3px 11px;border-radius:2px;letter-spacing:.05em;box-shadow:0 0 10px rgba(247,168,78,.45);}
h3.sub-title{font-family:var(--fd);font-size:1.35rem;font-weight:700;color:var(--gold2);margin:26px 0 11px;}
p{margin-bottom:.9em;}ul,ol{padding-left:1.4em;margin-bottom:.9em;}li{margin-bottom:.32em;}
strong{color:var(--lava2);font-weight:700;}em{color:var(--gold2);}
.box{padding:16px 19px 14px;margin:16px 0;border-radius:var(--r);border:1px solid var(--brd);background:rgba(255,255,255,.025);backdrop-filter:blur(4px);}
.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(--lava-p);border-color:var(--lava-dd);box-shadow:inset 0 0 24px rgba(255,74,31,.06);}.box.def .box-label{color:var(--lava2);}
.box.histoire{background:var(--gold-p);border-left:4px solid var(--gold);}.box.histoire .box-label{color:var(--gold2);}
.box.technique{background:var(--ash-p);border-left:4px solid var(--ash);}.box.technique .box-label{color:var(--ash);}
.box.conseil{background:rgba(220,150,80,.08);border-left:4px solid #e8a058;}.box.conseil .box-label{color:#f7b87c;}
.box.attention{background:rgba(255,74,31,.14);border-left:4px solid var(--lava);box-shadow:inset 0 0 24px rgba(255,74,31,.08);}.box.attention .box-label{color:var(--lava);}
.box.chiffres{background:rgba(0,0,0,.55);border-color:var(--brdh);}.box.chiffres .box-label{color:var(--gold);}
.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(--gold2);border:1px solid var(--gold-d);padding:4px 14px;border-radius:2px;cursor:pointer;background:transparent;margin-top:8px;transition:all .18s;user-select:none;}
.detail-toggle:hover{background:var(--gold);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,.55);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:.89rem;overflow:hidden;border:1px solid var(--brd);border-radius:var(--r);}
.data-table th{background:rgba(255,74,31,.22);color:var(--lava2);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(--lava-p);}.data-table td:first-child{font-family:var(--fm);font-size:.8rem;color:var(--gold);}
code{font-family:var(--fm);font-size:.82em;background:rgba(0,0,0,.55);color:var(--lava2);padding:2px 6px;border-radius:2px;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(--lava);padding:12px 18px;align-items:center;justify-content:space-between;box-shadow:0 2px 20px rgba(255,74,31,.3);}
.mobile-menu-btn{background:none;border:none;color:var(--lava2);font-size:1.3rem;cursor:pointer;}
.mobile-title{font-family:var(--fd);font-size:1.15rem;color:var(--lava2);font-weight:900;}
.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,.85);}
.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:2.8rem;}.two-col{grid-template-columns:1fr;}.page-header::before{width:60px;height:60px;top:40px;right:0;}}