/* ============================================================
   neurosciences.css — Réseau Neural
   Palette : #060810 noir neural | #06b6d4 cyan synaptique | #8b5cf6 violet | #f0abfc rose dendrite
   Polices  : Instrument Sans (display) + Literata (corps) + Fira Code
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Sans:ital,wght@0,400;0,600;0,700;1,400&family=Literata:ital,opsz,wght@0,7..72,400;0,7..72,500;1,7..72,400&family=Fira+Code:wght@400;500&display=swap');

:root {
  --void:    #060810;
  --void2:   #090c1a;
  --void3:   #0e1228;
  --card:    #0b0f20;
  --border:  #1a2050;
  --border2: #232a68;
  --cyan:    #06b6d4;
  --cyan2:   #0891b2;
  --violet:  #8b5cf6;
  --violet2: #7c3aed;
  --pink:    #f0abfc;
  --pink2:   #e879f9;
  --green:   #34d399;
  --amber:   #fbbf24;
  --text:    #7090c0;
  --text-hi: #e0ecff;
  --muted:   #283870;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Literata', Georgia, serif;
  background: var(--void);
  color: var(--text);
  line-height: 1.82;
  font-size: 1.02rem;
  overflow-x: hidden;
}

/* ── SYNAPTIC GLOW BACKGROUND ─────────────────── */
body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 15% 25%, rgba(6,182,212,.07) 0%, transparent 55%),
    radial-gradient(ellipse 50% 50% at 85% 70%, rgba(139,92,246,.07) 0%, transparent 55%),
    radial-gradient(ellipse 40% 30% at 50% 90%, rgba(240,171,252,.05) 0%, transparent 55%);
  pointer-events: none; z-index: 0;
  animation: neural-pulse 10s ease-in-out infinite alternate;
}
@keyframes neural-pulse { 0%{opacity:.7} 100%{opacity:1} }

/* ── PROGRESS BAR ─────────────────────────────── */
#progress-bar {
  position: fixed; top: 0; left: 0;
  height: 2px; width: 0%;
  background: linear-gradient(90deg, var(--violet2), var(--cyan), var(--pink));
  z-index: 1000;
  box-shadow: 0 0 10px var(--cyan);
  transition: width .1s linear;
}

/* ── NAV ──────────────────────────────────────── */
nav {
  position: fixed; top: 2px; left: 0; right: 0; z-index: 900;
  background: rgba(6,8,16,.96);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border2);
  display: flex; align-items: center; gap: 2px;
  padding: 0 32px; height: 54px; overflow-x: auto;
}
.nav-brand {
  font-family: 'Instrument Sans', sans-serif;
  font-weight: 700; font-size: 1rem;
  color: var(--cyan); text-decoration: none;
  letter-spacing: .02em; margin-right: 24px; flex-shrink: 0;
  display: flex; align-items: center; gap: 8px;
}
.nav-brand::before {
  content: '◎';
  color: var(--violet);
  animation: node-pulse 3s ease-in-out infinite;
  display: inline-block;
}
@keyframes node-pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.4;transform:scale(1.3)} }
nav a:not(.nav-brand) {
  font-family: 'Fira Code', monospace;
  font-size: .65rem; color: var(--muted);
  text-decoration: none; padding: 5px 10px;
  border-radius: 4px; white-space: nowrap;
  transition: color .2s, background .2s;
  text-transform: uppercase; letter-spacing: .04em;
}
nav a:not(.nav-brand):hover, nav a.active {
  color: var(--cyan); background: rgba(6,182,212,.08);
}

/* ── HERO ─────────────────────────────────────── */
.hero {
  position: relative; padding: 112px 56px 78px;
  overflow: hidden; z-index: 1;
  border-bottom: 1px solid var(--border);
}
.hero-inner { max-width: 840px; position: relative; z-index: 2; }

.hero-label {
  font-family: 'Fira Code', monospace;
  font-size: .7rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--violet); margin-bottom: 22px;
  display: flex; align-items: center; gap: 10px;
}
.hero-label::after { content: ''; flex: 1; height: 1px; background: linear-gradient(90deg, var(--violet), transparent); max-width: 120px; }

.hero h1 {
  font-family: 'Instrument Sans', sans-serif;
  font-weight: 700; font-size: clamp(3rem, 7vw, 6.5rem);
  line-height: .9; color: var(--text-hi); margin-bottom: 20px;
  letter-spacing: -.02em;
}
.hero h1 .c1 { color: var(--cyan); }
.hero h1 .c2 { color: var(--violet); }
.hero h1 .c3 { color: var(--pink); }
.hero p.lead { font-size: 1.06rem; color: var(--text); max-width: 620px; line-height: 1.82; font-style: italic; }

/* ── STATS ────────────────────────────────────── */
.kpi-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.kpi {
  background: var(--card); border: 1px solid var(--border2);
  border-radius: 6px; padding: 14px 20px; flex: 1; min-width: 130px;
  position: relative; overflow: hidden;
}
.kpi::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 2px; background: var(--cyan); }
.kpi.v::after { background: var(--violet); }
.kpi.p::after { background: var(--pink); }
.kpi.g::after { background: var(--green); }
.kpi .kv {
  font-family: 'Instrument Sans', sans-serif; font-weight: 700;
  font-size: 1.8rem; color: var(--cyan); line-height: 1; display: block;
}
.kpi.v .kv { color: var(--violet); }
.kpi.p .kv { color: var(--pink); }
.kpi.g .kv { color: var(--green); }
.kpi .kl { font-family: 'Fira Code', monospace; font-size: .61rem; color: var(--muted); letter-spacing: .06em; text-transform: uppercase; margin-top: 4px; }

/* ── LAYOUT ───────────────────────────────────── */
.container { max-width: 1240px; margin: 0 auto; padding: 60px 40px; position: relative; z-index: 1; }
.two-col { display: grid; grid-template-columns: 1fr 290px; gap: 36px; }
@media (max-width: 940px) { .two-col { grid-template-columns: 1fr; } }

/* ── SECTIONS ─────────────────────────────────── */
.section { margin-bottom: 68px; opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.section.visible { opacity: 1; transform: none; }
.sec-label { font-family: 'Fira Code', monospace; font-size: .65rem; letter-spacing: .18em; text-transform: uppercase; color: var(--violet); margin-bottom: 8px; }
.section h2 {
  font-family: 'Instrument Sans', sans-serif; font-weight: 700;
  font-size: 2rem; color: var(--text-hi); letter-spacing: -.01em;
  padding-bottom: 12px; border-bottom: 1px solid var(--border2); margin-bottom: 22px; position: relative;
}
.section h2::after { content: ''; position: absolute; bottom: -1px; left: 0; height: 2px; width: 60px; background: var(--cyan); }
.section h3 { font-family: 'Instrument Sans', sans-serif; font-weight: 600; font-size: 1.1rem; color: var(--cyan); margin: 24px 0 10px; }

/* ── NEURON DIAGRAM ───────────────────────────── */
.neuron-parts { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin: 16px 0; }
.np {
  background: var(--card); border: 1px solid var(--border2);
  border-radius: 6px; padding: 16px; border-top: 3px solid var(--cyan);
  transition: transform .2s, border-color .2s;
}
.np:hover { transform: translateY(-3px); border-color: var(--cyan); }
.np.violet { border-top-color: var(--violet); }
.np.pink   { border-top-color: var(--pink); }
.np.green  { border-top-color: var(--green); }
.np.amber  { border-top-color: var(--amber); }
.np-icon { font-size: 1.6rem; display: block; margin-bottom: 8px; }
.np-name { font-family: 'Instrument Sans', sans-serif; font-weight: 700; font-size: .9rem; color: var(--text-hi); margin-bottom: 4px; letter-spacing: .02em; text-transform: uppercase; }
.np-desc { font-size: .83rem; color: var(--text); line-height: 1.55; }

/* ── CARDS ────────────────────────────────────── */
.card {
  background: var(--card); border: 1px solid var(--border2);
  border-radius: 6px; padding: 18px 22px; margin-bottom: 14px;
  transition: border-color .2s, transform .2s;
}
.card:hover { border-color: var(--cyan2); transform: translateY(-2px); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 12px; margin: 16px 0; }

/* ── NEUROTR TABLE SPECIAL ────────────────────── */
.nt-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin: 16px 0; }
.nt-card {
  background: var(--card); border: 1px solid var(--border2);
  border-radius: 6px; padding: 16px; transition: transform .2s;
}
.nt-card:hover { transform: translateY(-2px); }
.nt-card.cyan   { border-left: 3px solid var(--cyan);   }
.nt-card.violet { border-left: 3px solid var(--violet); }
.nt-card.pink   { border-left: 3px solid var(--pink);   }
.nt-card.green  { border-left: 3px solid var(--green);  }
.nt-card.amber  { border-left: 3px solid var(--amber);  }
.nt-name { font-family: 'Instrument Sans', sans-serif; font-weight: 700; font-size: .92rem; color: var(--text-hi); margin-bottom: 3px; }
.nt-type { font-family: 'Fira Code', monospace; font-size: .63rem; color: var(--muted); letter-spacing: .06em; text-transform: uppercase; margin-bottom: 7px; }
.nt-desc { font-size: .83rem; color: var(--text); line-height: 1.55; }

/* ── BOX ──────────────────────────────────────── */
.box { border-radius: 6px; padding: 13px 17px; margin: 14px 0; border-left: 3px solid; font-size: .96rem; }
.box-cyan   { background: rgba(6,182,212,.05);   border-color: var(--cyan);   }
.box-violet { background: rgba(139,92,246,.05);  border-color: var(--violet); }
.box-pink   { background: rgba(240,171,252,.05); border-color: var(--pink);   }
.box-green  { background: rgba(52,211,153,.05);  border-color: var(--green);  }
.box-amber  { background: rgba(251,191,36,.05);  border-color: var(--amber);  }

/* ── TAG ──────────────────────────────────────── */
.tag { display:inline-block; padding:3px 10px; border-radius:4px; font-family:'Fira Code',monospace; font-size:.64rem; letter-spacing:.06em; text-transform:uppercase; margin-bottom:8px; font-weight:500; }
.tag-cyan   { background:rgba(6,182,212,.1);   color:var(--cyan);   border:1px solid rgba(6,182,212,.25); }
.tag-violet { background:rgba(139,92,246,.1);  color:var(--violet); border:1px solid rgba(139,92,246,.25);}
.tag-pink   { background:rgba(240,171,252,.1); color:var(--pink);   border:1px solid rgba(240,171,252,.25);}
.tag-green  { background:rgba(52,211,153,.1);  color:var(--green);  border:1px solid rgba(52,211,153,.25); }
.tag-amber  { background:rgba(251,191,36,.1);  color:var(--amber);  border:1px solid rgba(251,191,36,.25); }

/* ── TABLE ────────────────────────────────────── */
table { width:100%; border-collapse:collapse; margin:12px 0; font-size:.91rem; }
th { background:var(--void3); color:var(--cyan); font-family:'Instrument Sans',sans-serif; font-weight:700; font-size:.76rem; letter-spacing:.08em; text-transform:uppercase; padding:9px 13px; text-align:left; border-bottom:1px solid var(--border2); }
td { padding:9px 13px; border-bottom:1px solid var(--border); color:var(--text); vertical-align:top; }
tr:hover td { background:rgba(6,182,212,.02); }

/* ── TIMELINE ─────────────────────────────────── */
.timeline { padding-left:28px; position:relative; }
.timeline::before { content:''; position:absolute; left:0; top:6px; bottom:6px; width:2px; background:linear-gradient(to bottom,var(--violet),var(--cyan)); }
.tl-item { position:relative; margin-bottom:20px; }
.tl-item::before { content:''; position:absolute; left:-35px; top:7px; width:8px; height:8px; background:var(--cyan); border-radius:50%; border:2px solid var(--void); box-shadow:0 0 6px var(--cyan); }
.tl-yr  { font-family:'Fira Code',monospace; font-size:.76rem; color:var(--violet); font-weight:500; }
.tl-who { font-family:'Instrument Sans',sans-serif; font-weight:700; color:var(--text-hi); font-size:1rem; }
.tl-desc { font-size:.89rem; color:var(--text); }

/* ── SIDEBAR ──────────────────────────────────── */
.sidebar { position:sticky; top:68px; }
.sb-card { background:var(--card); border:1px solid var(--border2); border-radius:6px; padding:16px 18px; margin-bottom:12px; }
.sb-card h3 { font-family:'Instrument Sans',sans-serif; font-weight:700; font-size:.85rem; color:var(--cyan); letter-spacing:.04em; text-transform:uppercase; margin-bottom:10px; padding-bottom:8px; border-bottom:1px solid var(--border); }
.sb-toc a { display:block; padding:5px 8px; font-family:'Fira Code',monospace; font-size:.65rem; color:var(--muted); text-decoration:none; border-radius:4px; transition:color .2s,background .2s; text-transform:uppercase; letter-spacing:.04em; }
.sb-toc a:hover, .sb-toc a.active { color:var(--cyan); background:rgba(6,182,212,.07); }

ul { padding-left:22px; } li { margin:5px 0; } ul li::marker { color:var(--cyan2); }
strong { color:var(--text-hi); font-weight:600; }
code { font-family:'Fira Code',monospace; background:var(--void3); color:var(--cyan); padding:2px 7px; border-radius:4px; font-size:.87em; }

#back-top { position:fixed; bottom:28px; right:28px; width:44px; height:44px; background:rgba(6,182,212,.15); border:1px solid var(--cyan); color:var(--cyan); border-radius:50%; cursor:pointer; font-size:1.1rem; display:flex; align-items:center; justify-content:center; opacity:0; pointer-events:none; transition:opacity .3s,transform .3s; z-index:800; font-family:'Instrument Sans',sans-serif; font-weight:700; }
#back-top.visible { opacity:1; pointer-events:auto; }
#back-top:hover { transform:translateY(-4px); }

footer { border-top:1px solid var(--border2); padding:24px 40px; text-align:center; color:var(--muted); font-family:'Fira Code',monospace; font-size:.7rem; letter-spacing:.08em; position:relative; z-index:1; }

@media (max-width:768px) { .hero { padding:88px 22px 50px; } .container { padding:36px 18px; } nav { padding:0 14px; } }