/* seisme.css — Thème : Rouge alerte, noir faille, gris béton, fissures */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&family=Space+Grotesk:wght@500;600;700&display=swap');
:root {
  --sb:#0a0a0d;--sb2:#111116;--surf:#1a1a22;--surf2:#232330;
  --red:#e02535;--red2:#ff4555;--red-p:rgba(255,69,85,.10);--red-d:rgba(255,69,85,.42);
  --alrt:#ff7518;--alrt2:#ff9338;--alrt-p:rgba(255,147,56,.10);--alrt-d:rgba(255,147,56,.42);
  --crck:#2a2a34;
  --cnc:#6e6e7a;--cnc2:#909098;
  --ink:#e8e8ee;--ink2:rgba(232,232,238,.66);--ink3:rgba(232,232,238,.3);
  --brd:rgba(255,69,85,.22);--brdh:rgba(255,69,85,.46);
  --fd:'Space Grotesk',-apple-system,sans-serif;--fb:'Inter',-apple-system,sans-serif;--fm:'JetBrains Mono',monospace;
  --sw:272px;--r:2px;
}
*,*::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:1.82;
  background-image:
    radial-gradient(ellipse at 15% 0%,rgba(255,69,85,.16) 0,transparent 45%),
    radial-gradient(ellipse at 85% 100%,rgba(255,147,56,.11) 0,transparent 45%),
    linear-gradient(92deg,transparent 49.6%,rgba(255,69,85,.06) 49.8%,rgba(255,69,85,.10) 50%,rgba(255,69,85,.06) 50.2%,transparent 50.4%);
  background-attachment:fixed;background-size:100% 100%,100% 100%,300px 100%;position:relative;min-height:100vh;}
body::before{content:'';position:fixed;top:0;left:0;right:0;height:3px;pointer-events:none;z-index:3;
  background:repeating-linear-gradient(90deg,var(--red) 0,var(--red) 24px,transparent 24px,transparent 28px);
  opacity:.6;}
body::after{content:'';position:fixed;inset:0;pointer-events:none;z-index:1;opacity:.35;
  background:
    linear-gradient(105deg,transparent 20%,transparent 29%,var(--crck) 29.05%,var(--crck) 29.15%,transparent 29.2%,transparent 38%,transparent 49%,var(--crck) 49.1%,var(--crck) 49.2%,transparent 49.3%,transparent 65%,var(--crck) 65.1%,var(--crck) 65.15%,transparent 65.2%,transparent 100%);}
.progress-bar{position:fixed;top:0;left:0;height:4px;width:0%;background:linear-gradient(90deg,var(--red2),var(--alrt2),var(--red2));z-index:200;transition:width .08s;box-shadow:0 0 14px rgba(255,69,85,.6);}
.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:linear-gradient(115deg,rgba(255,69,85,.14),transparent 65%);}
.sidebar-header::before{content:'';position:absolute;right:-1px;top:22px;bottom:22px;width:3px;background:repeating-linear-gradient(0deg,var(--red2) 0,var(--red2) 5px,transparent 5px,transparent 9px);opacity:.5;}
.sidebar-header::after{content:'';position:absolute;bottom:-1px;left:22px;width:54px;height:2px;background:var(--red2);box-shadow:0 0 8px var(--red2);}
.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(--red2);}
.sidebar-title{font-family:var(--fd);font-size:2rem;font-weight:700;color:var(--red2);line-height:1.0;letter-spacing:-.02em;text-shadow:0 0 18px rgba(255,69,85,.35);}
.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(--fm);font-size:.78rem;color:var(--ink2);text-decoration:none;border-left:2px solid transparent;transition:all .15s;}
.toc-link:hover,.toc-link.active{color:var(--red2);border-left-color:var(--red2);background:var(--red-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(--red2);}
.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:60px;right:10px;font-size:2rem;color:var(--red2);opacity:.45;text-shadow:0 0 22px rgba(255,69,85,.5);line-height:1;}
.page-header::after{content:'';position:absolute;bottom:-1px;left:0;width:180px;height:2px;background:var(--red2);box-shadow:0 0 14px rgba(255,69,85,.6);}
.subject-tag{font-family:var(--fm);font-size:.62rem;letter-spacing:.24em;text-transform:uppercase;color:var(--red2);margin-bottom:12px;}
h1.page-title{font-family:var(--fd);font-size:3.8rem;font-weight:700;color:var(--ink);line-height:.98;letter-spacing:-.03em;}
h1.page-title .sub{color:var(--red2);font-size:1rem;display:block;margin-top:10px;font-family:var(--fm);font-weight:500;letter-spacing:.02em;text-transform:uppercase;}
.page-intro{margin-top:17px;font-size:1rem;color:var(--ink2);max-width:540px;}
.section{margin-bottom:60px;scroll-margin-top:26px;}
h2.section-title{font-family:var(--fd);font-size:2rem;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;letter-spacing:-.02em;}
h2.section-title .num{font-family:var(--fm);font-size:.7rem;color:#fff;background:var(--red);padding:3px 11px;border-radius:2px;font-weight:600;box-shadow:0 0 10px rgba(255,69,85,.45);}
h3.sub-title{font-family:var(--fd);font-size:1.25rem;font-weight:700;color:var(--red2);margin:26px 0 11px;}
p{margin-bottom:.9em;}ul,ol{padding-left:1.4em;margin-bottom:.9em;}li{margin-bottom:.32em;}
strong{color:#ffe0e5;font-weight:600;}em{color:var(--alrt2);}
.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:.16em;text-transform:uppercase;display:block;margin-bottom:9px;}
.box.def{background:var(--red-p);border-color:var(--red-d);}.box.def .box-label{color:var(--red2);}
.box.histoire{background:var(--alrt-p);border-left:4px solid var(--alrt2);}.box.histoire .box-label{color:var(--alrt2);}
.box.technique{background:rgba(110,110,122,.10);border-left:4px solid var(--cnc2);}.box.technique .box-label{color:var(--cnc2);}
.box.conseil{background:rgba(90,170,130,.08);border-left:4px solid #5aaa82;}.box.conseil .box-label{color:#7ac09d;}
.box.attention{background:rgba(255,69,85,.14);border-left:4px solid var(--red2);position:relative;}
.box.attention::before{content:'⚠';position:absolute;right:14px;top:10px;color:var(--red2);opacity:.35;font-size:1.2rem;}
.box.attention .box-label{color:var(--red2);}
.box.chiffres{background:rgba(0,0,0,.5);border-color:var(--brdh);}.box.chiffres .box-label{color:var(--red2);}
.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(--fm);font-size:.82rem;color:var(--red2);border:1px solid var(--red-d);padding:4px 14px;border-radius:2px;cursor:pointer;background:transparent;margin-top:8px;transition:all .18s;user-select:none;text-transform:uppercase;letter-spacing:.06em;}
.detail-toggle:hover{background:var(--red);color:#fff;}.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,.5);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:.87rem;overflow:hidden;border:1px solid var(--brd);border-radius:var(--r);}
.data-table th{background:rgba(224,37,53,.28);color:var(--red2);padding:10px 14px;text-align:left;font-family:var(--fm);font-size:.7rem;letter-spacing:.12em;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(--red-p);}.data-table td:first-child{font-family:var(--fm);font-size:.8rem;color:var(--red2);}
code{font-family:var(--fm);font-size:.82em;background:rgba(0,0,0,.5);color:var(--red2);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(--red2);padding:12px 18px;align-items:center;justify-content:space-between;}
.mobile-menu-btn{background:none;border:none;color:var(--red2);font-size:1.3rem;cursor:pointer;}
.mobile-title{font-family:var(--fd);font-size:1.1rem;color:var(--red2);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,.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:2.55rem;}.two-col{grid-template-columns:1fr;}body::before,body::after{display:none;}}