:root{--bg:#100e12;--panel:#17131a;--line:#342b39;--text:#f3eff1;--muted:#aaa1ae;--matter:#ffac7d;--anti:#bba3fc;--green:#c4f58b;--gold:#f5dfac;font-family:Arial,Helvetica,sans-serif;color:var(--text);background:var(--bg);color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0}a{color:inherit;text-decoration:none}a:hover{color:var(--matter)}
button,input,select{font:inherit}button{color:inherit;cursor:pointer}button:disabled{cursor:default;opacity:.4}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--matter);outline-offset:4px}
.skip{position:absolute;left:-999px}.skip:focus{left:16px;top:16px;background:var(--panel);padding:8px 12px;z-index:9}
.wrap{width:min(1320px,calc(100% - 64px));margin-inline:auto}
.header{min-height:88px;padding:16px 32px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);gap:20px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:14px;font-size:12px;font-weight:700;letter-spacing:2px}.brand-mark{font-size:36px;letter-spacing:-4px;font-weight:400}.brand-mark>span{color:var(--anti);font-size:28px;vertical-align:top}
.brand small{display:block;font-size:8px;font-weight:400;color:var(--muted);letter-spacing:1.5px;margin-top:6px}
.header nav{display:flex;gap:26px;font-size:12px;flex-wrap:wrap}.header nav span{color:var(--green);margin-left:5px}.edition{font-size:9px;color:var(--muted);letter-spacing:1px}.edition b{font-weight:400;margin-left:14px;color:var(--anti)}
.intro{padding-top:48px}.eyebrow{font-size:10px;letter-spacing:1.8px;color:var(--matter)}.dot{display:inline-block;width:6px;height:6px;background:var(--matter);border-radius:50%;margin-right:10px}
.intro .eyebrow>span{margin:0 14px;color:#716675}
h1{font-size:clamp(44px,7vw,104px);line-height:1.1;letter-spacing:-.05em;font-weight:400;margin:22px 0 12px}h1>span{font-family:Georgia,serif;font-size:.6em;color:var(--anti);vertical-align:top}
.intro-line h2{font-size:clamp(22px,2.6vw,34px);font-weight:400;margin:0 0 8px}.intro-line p{color:var(--muted);max-width:640px;line-height:1.6;margin:0}
.section{padding:56px 0 16px;border-top:1px solid var(--line);margin-top:40px}.section-heading{display:flex;justify-content:space-between;gap:32px;align-items:flex-end;flex-wrap:wrap;margin-bottom:26px}
.section-heading h2{font-size:clamp(26px,3.2vw,44px);font-weight:400;letter-spacing:-.03em;line-height:1.15;margin:10px 0 0}.section-heading h2 em{font-style:italic;color:var(--gold)}.section-heading p{max-width:440px;color:var(--muted);line-height:1.6;margin:0}
.equation-card{background:var(--panel);border:1px solid var(--line);padding:26px 28px;border-radius:6px}
.equation{font-family:Georgia,"Times New Roman",serif;font-size:clamp(18px,2.4vw,28px);line-height:1.9;text-align:center;margin:0 0 6px}
.equation .term{padding:2px 6px;border-radius:4px;border:1px solid transparent}.equation .term.nonlinear{border-color:var(--matter);color:var(--matter)}.equation .term.viscous{border-color:var(--green);color:var(--green)}.equation .term.force{border-color:var(--anti);color:var(--anti)}
.equation small{font-size:.55em;color:var(--muted)}
.terms{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin-top:18px}.terms article{border-top:1px solid var(--line);padding-top:10px;font-size:13px;line-height:1.55;color:var(--muted)}.terms h3{font-size:14px;margin:0 0 6px;color:var(--text);font-family:Georgia,serif;font-weight:400}
.terms .nonlinear h3{color:var(--matter)}.terms .viscous h3{color:var(--green)}.terms .force h3{color:var(--anti)}
.lab{display:grid;grid-template-columns:320px 1fr;gap:26px;align-items:start}@media(max-width:900px){.lab{grid-template-columns:1fr}}
.controls{background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:22px}.controls h3{font-size:20px;font-weight:400;margin:6px 0 16px}
.range-control{margin:14px 0}.range-control label{display:flex;justify-content:space-between;font-size:12px}.range-control output{color:var(--green)}.range-control p{margin:2px 0 6px;font-size:11px;color:var(--muted)}.range-control input{width:100%}
.presets,.views{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}.presets button,.views button{background:transparent;border:1px solid var(--line);border-radius:4px;padding:7px 10px;font-size:12px}.presets button.selected,.views button.selected{border-color:var(--green);color:var(--green)}
select{background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:4px;padding:6px 8px;width:100%}
.primary{width:100%;margin-top:14px;background:var(--matter);color:#100e12;border:0;border-radius:4px;padding:12px;font-weight:700}
.secondary-actions{display:flex;gap:8px;margin-top:8px}.secondary-actions button{flex:1;background:transparent;border:1px solid var(--line);border-radius:4px;padding:9px;font-size:12px}
.control-note{font-size:11px;color:var(--muted);line-height:1.5;margin:12px 0 0}
.experiment{background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:18px}.experiment-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.state{font-size:10px;letter-spacing:1.5px;color:var(--green)}
#fluid-canvas{width:100%;aspect-ratio:1;display:block;border-radius:4px;background:#000;touch-action:none;cursor:crosshair}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin-top:14px}.stats div{border-top:1px solid var(--line);padding-top:8px}.stats span{display:block;font-size:9px;letter-spacing:1.4px;color:var(--muted)}.stats strong{font-size:16px;font-weight:400;font-family:Georgia,serif}
.result-note{font-size:11px;color:var(--muted);margin:12px 0 0;line-height:1.5}
.blowup{display:grid;grid-template-columns:1fr 300px;gap:22px}@media(max-width:900px){.blowup{grid-template-columns:1fr}}
#blowup-canvas{width:100%;height:auto;display:block;border-radius:4px;border:1px solid var(--line)}
.statements{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}.statements article{background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:18px;font-size:13px;line-height:1.55;color:var(--muted)}
.statements h3{margin:0 0 8px;font-size:15px;color:var(--text);font-weight:400;font-family:Georgia,serif}.statements .tag{display:inline-block;font-size:9px;letter-spacing:1.4px;padding:3px 7px;border-radius:3px;border:1px solid var(--line);margin-bottom:8px}
.statements .open .tag{color:var(--gold);border-color:var(--gold)}.statements .claimed .tag{color:var(--matter);border-color:var(--matter)}
.refs{font-size:13px;line-height:1.7;color:var(--muted)}.refs li{margin-bottom:6px}.refs a{color:var(--text);border-bottom:1px solid var(--line)}
footer{padding:40px 0 60px;font-size:11px;color:var(--muted);line-height:1.6}

/* ---- bandeau animé ---- */
.hero-band{position:relative;margin:46px 0 4px;border-block:1px solid var(--line);background:#0b090d}
#hero-canvas{display:block;width:100%;height:clamp(180px,26vw,320px);object-fit:cover}
.hero-band:after{content:'';position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,var(--bg),transparent 12%,transparent 88%,var(--bg)),linear-gradient(180deg,rgba(16,14,18,.55),transparent 30%,transparent 72%,rgba(16,14,18,.75))}
.hero-caption{position:absolute;left:0;right:0;bottom:0;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:10px max(24px,calc((100vw - 1320px)/2));font-size:10px;letter-spacing:1.4px;color:#cfc6d6;z-index:1;text-shadow:0 1px 8px #000}
.hero-caption span:last-child{color:var(--muted);letter-spacing:.6px}

/* ---- laboratoire ---- */
.lab{grid-template-columns:340px 1fr}
.controls{position:sticky;top:16px}
.controls h3{margin-bottom:18px}
.controls .eyebrow{display:block;margin:18px 0 8px}
.controls .eyebrow:first-of-type{margin-top:0}
.presets{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:0}
.presets button{padding:9px 8px;font-size:12px;text-align:left;background:#1d1822;border:1px solid var(--line);border-radius:5px;transition:border-color .15s,color .15s,background .15s}
.presets button:hover{background:#241e2a}
.presets button.selected{border-color:var(--green);color:var(--green);background:#1b2216}
.views button{flex:1;text-align:center}
.range-control p{line-height:1.45}
.range-control input[type=range]{accent-color:var(--matter)}
.warning{margin:8px 0 0;padding:8px 10px;border-left:2px solid var(--gold);background:#1e1a14;color:var(--gold);font-size:11px;line-height:1.45}
.warning[hidden]{display:none}
.experiment{padding:16px}
.experiment-top{align-items:center}
.top-right{display:flex;align-items:center;gap:12px}
.badge{font-size:9px;letter-spacing:1.3px;padding:3px 8px;border-radius:3px;border:1px solid}
.badge.ok{color:var(--green);border-color:#2f3d25;background:#161c12}
.badge.warn{color:var(--gold);border-color:#493d24;background:#1e1a12}
#fluid-canvas{width:100%;aspect-ratio:1;display:block;border-radius:5px;background:#0b090d;touch-action:none;cursor:crosshair;box-shadow:0 0 0 1px #ffffff0d,0 24px 70px -30px #000}
.stats strong{letter-spacing:-.01em}
.stats div{border-top-color:#2a2330}
@media(max-width:900px){.controls{position:static}.lab{grid-template-columns:1fr}}

/* ---- schéma d'explosion ---- */
#blowup-canvas{box-shadow:0 0 0 1px #ffffff0d,0 20px 60px -34px #000}