/* toundra.css — Thème : Blanc glaciaire, bleu polaire translucide, vert lichen, ombres nocturnes polaires */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');
:root {
  --sb:#0b1014;--sb2:#10181f;--surf:#162028;--surf2:#1d2933;
  --ice:#bfe1ec;--ice2:#dff0f6;--ice-d:#8cc0d0;--ice-p:rgba(191,225,236,.10);--ice-dd:rgba(140,192,208,.42);
  --lich:#9ab98c;--lich2:#b4d1a6;--lich-p:rgba(154,185,140,.10);--lich-d:rgba(154,185,140,.42);
  --aur:#7ac0d4;--aur-p:rgba(122,192,212,.10);
  --ink:#e4eef3;--ink2:rgba(228,238,243,.66);--ink3:rgba(228,238,243,.30);
  --brd:rgba(191,225,236,.14);--brdh:rgba(191,225,236,.32);
  --fd:'Space Grotesk',-apple-system,sans-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 20% 10%,rgba(122,192,212,.16) 0,transparent 50%),
    radial-gradient(ellipse at 85% 85%,rgba(154,185,140,.08) 0,transparent 45%),
    radial-gradient(ellipse at 50% 50%,rgba(191,225,236,.05) 0,transparent 60%);
  background-attachment:fixed;position:relative;min-height:100vh;}
/* aurores boréales scintillantes */
body::before{content:'';position:fixed;top:0;left:0;right:0;height:200px;pointer-events:none;z-index:1;
  background:linear-gradient(180deg,rgba(122,192,212,.22) 0%,rgba(122,192,212,.1) 40%,transparent 100%);
  filter:blur(40px);opacity:.7;}
body::after{content:'';position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:
    radial-gradient(circle at 10% 20%,rgba(255,255,255,.06) 1px,transparent 1px),
    radial-gradient(circle at 80% 70%,rgba(255,255,255,.05) 1px,transparent 1px),
    radial-gradient(circle at 30% 80%,rgba(255,255,255,.04) 1px,transparent 1px),
    radial-gradient(circle at 60% 40%,rgba(255,255,255,.07) 1px,transparent 1px);
  background-size:240px 240px,180px 180px,320px 320px,160px 160px;opacity:.8;}
.progress-bar{position:fixed;top:0;left:0;height:4px;width:0%;background:linear-gradient(90deg,var(--ice),var(--aur),var(--lich2));z-index:200;transition:width .08s;box-shadow:0 0 14px rgba(122,192,212,.45);}
.page-layout{display:flex;min-height:100vh;position:relative;z-index:2;}
.sidebar{width:var(--sw);flex-shrink:0;background:rgba(11,16,20,.88);backdrop-filter:blur(14px);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;}
.sidebar-header::before{content:'';position:absolute;right:20px;top:36px;width:26px;height:26px;border-radius:50%;
  background:radial-gradient(circle,var(--ice2),var(--ice) 60%,transparent 72%);
  box-shadow:0 0 18px rgba(191,225,236,.6);opacity:.9;}
.sidebar-header::after{content:'';position:absolute;bottom:-1px;left:22px;width:66px;height:2px;background:linear-gradient(90deg,var(--aur),var(--ice),transparent);}
.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(--aur);}
.sidebar-title{font-family:var(--fd);font-size:2.15rem;font-weight:600;color:var(--ice2);line-height:1.0;letter-spacing:-.015em;}
.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(--ice2);border-left-color:var(--aur);background:var(--aur-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(--ice-d);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(--ice2);}
.sidebar-nav a.current{font-weight:600;}
.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:82px;right:0;width:80px;height:80px;border-radius:50%;
  background:radial-gradient(circle,var(--ice2) 0%,var(--ice) 40%,transparent 70%);
  box-shadow:0 0 40px rgba(191,225,236,.4);opacity:.55;}
.subject-tag{font-family:var(--fm);font-size:.62rem;letter-spacing:.22em;text-transform:uppercase;color:var(--aur);margin-bottom:12px;}
h1.page-title{font-family:var(--fd);font-size:4.2rem;font-weight:700;color:var(--ink);line-height:.98;letter-spacing:-.025em;text-shadow:0 0 30px rgba(122,192,212,.25);}
h1.page-title .sub{color:var(--aur);font-size:1.05rem;display:block;margin-top:12px;font-family:var(--fm);font-weight:400;font-size:.82rem;letter-spacing:.08em;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:2.1rem;font-weight:700;color:var(--ice2);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-size:.7rem;color:var(--sb);background:var(--ice);padding:3px 11px;border-radius:2px;font-weight:500;letter-spacing:.05em;box-shadow:0 0 12px rgba(191,225,236,.4);}
h3.sub-title{font-family:var(--fd);font-size:1.25rem;font-weight:600;color:var(--aur);margin:26px 0 11px;}
p{margin-bottom:.9em;}ul,ol{padding-left:1.4em;margin-bottom:.9em;}li{margin-bottom:.32em;}
strong{color:var(--ice2);font-weight:600;}em{color:var(--lich2);}
.box{padding:16px 19px 14px;margin:16px 0;border-radius:var(--r);border:1px solid var(--brd);background:rgba(255,255,255,.03);backdrop-filter:blur(6px);}
.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(--ice-p);border-color:var(--ice-dd);}.box.def .box-label{color:var(--ice2);}
.box.histoire{background:var(--lich-p);border-left:4px solid var(--lich);}.box.histoire .box-label{color:var(--lich2);}
.box.technique{background:var(--aur-p);border-left:4px solid var(--aur);}.box.technique .box-label{color:var(--aur);}
.box.conseil{background:rgba(180,210,230,.06);border-left:4px solid var(--ice-d);}.box.conseil .box-label{color:var(--ice);}
.box.attention{background:rgba(240,120,110,.07);border-left:4px solid #e88070;}.box.attention .box-label{color:#f09c8a;}
.box.chiffres{background:rgba(0,0,0,.42);border-color:var(--brdh);}.box.chiffres .box-label{color:var(--aur);}
.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(--aur);border:1px solid rgba(122,192,212,.4);padding:4px 14px;border-radius:2px;cursor:pointer;background:transparent;margin-top:8px;transition:all .18s;user-select:none;}
.detail-toggle:hover{background:var(--aur);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,.42);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(140,192,208,.22);color:var(--ice2);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(--aur-p);}.data-table td:first-child{font-family:var(--fm);font-size:.8rem;color:var(--aur);}
code{font-family:var(--fm);font-size:.82em;background:rgba(0,0,0,.42);color:var(--aur);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:1px solid var(--aur);padding:12px 18px;align-items:center;justify-content:space-between;}
.mobile-menu-btn{background:none;border:none;color:var(--ice2);font-size:1.3rem;cursor:pointer;}
.mobile-title{font-family:var(--fd);font-size:1.15rem;color:var(--ice2);font-weight:700;letter-spacing:-.01em;}
.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,.82);}
.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:2.7rem;}.two-col{grid-template-columns:1fr;}body::before{height:100px;}.page-header::before{width:40px;height:40px;top:50px;}}