/* ============================================================
   digestion.css — Atlas Anatomique Chaud
   Palette : #fdf6ec ivoire | #7c2d12 terra profond | #ea580c orange | #92400e brun | #15803d vert bile
   Polices  : Zilla Slab (slab serif display) + Nunito Sans (corps) + Space Mono
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Zilla+Slab:ital,wght@0,400;0,600;0,700;1,400;1,600&family=Nunito+Sans:ital,wght@0,400;0,600;0,700;1,400&family=Space+Mono:ital,wght@0,400;0,700;1,400&display=swap');

:root {
  --cream:   #fdf6ec;
  --cream2:  #f5e8d5;
  --cream3:  #ecdcc5;
  --card:    #fffdf8;
  --border:  #dac9ac;
  --border2: #c4a882;
  --terra:   #7c2d12;
  --terra2:  #9a3412;
  --orange:  #ea580c;
  --orange2: #c2410c;
  --brown:   #92400e;
  --brown2:  #78350f;
  --bile:    #15803d;
  --bile2:   #166534;
  --azure:   #1d4ed8;
  --rose:    #be123c;
  --text:    #3b1f08;
  --text2:   #5c3416;
  --muted:   #8b6038;
  --light-o: rgba(234,88,12,.06);
}

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

body {
  font-family: 'Nunito Sans', system-ui, sans-serif;
  background: var(--cream);
  color: var(--text);
  line-height: 1.82;
  font-size: 1.02rem;
  overflow-x: hidden;
}

/* ── WARM PAPER TEXTURE ───────────────────────── */
body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 80% 10%, rgba(234,88,12,.04) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 10% 80%, rgba(124,45,18,.05) 0%, transparent 60%),
    radial-gradient(ellipse 40% 30% at 50% 50%, rgba(21,128,61,.03) 0%, transparent 55%);
  pointer-events: none; z-index: 0;
}

/* ── PROGRESS BAR ─────────────────────────────── */
#progress-bar {
  position: fixed; top: 0; left: 0;
  height: 4px; width: 0%;
  background: linear-gradient(90deg, var(--terra2), var(--orange), var(--bile));
  z-index: 1000;
  transition: width .1s linear;
}

/* ── NAV ──────────────────────────────────────── */
nav {
  position: fixed; top: 4px; left: 0; right: 0; z-index: 900;
  background: rgba(253,246,236,.97);
  backdrop-filter: blur(16px);
  border-bottom: 2px solid var(--terra);
  display: flex; align-items: center; gap: 2px;
  padding: 0 32px; height: 54px; overflow-x: auto;
}
.nav-brand {
  font-family: 'Zilla Slab', serif;
  font-weight: 700; font-style: italic; font-size: 1.1rem;
  color: var(--terra); text-decoration: none;
  letter-spacing: .02em; margin-right: 24px; flex-shrink: 0;
  display: flex; align-items: center; gap: 6px;
}
.nav-brand::before { content: '🫁'; font-size: .9rem; font-style: normal; }
nav a:not(.nav-brand) {
  font-family: 'Space Mono', monospace;
  font-size: .65rem; color: var(--muted);
  text-decoration: none; padding: 5px 10px;
  border-radius: 4px; white-space: nowrap;
  transition: color .2s, background .2s; letter-spacing: .04em;
  text-transform: uppercase;
}
nav a:not(.nav-brand):hover, nav a.active {
  color: var(--terra); background: var(--light-o);
}

/* ── HERO ─────────────────────────────────────── */
.hero {
  position: relative; padding: 110px 56px 76px;
  overflow: hidden; z-index: 1;
  border-bottom: 2px solid var(--border);
  background: linear-gradient(160deg, var(--cream) 60%, var(--cream2) 100%);
}
.hero-inner { max-width: 840px; position: relative; z-index: 2; }

.hero-eyebrow {
  font-family: 'Space Mono', monospace;
  font-size: .7rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--orange); border: 1.5px solid var(--orange);
  padding: 5px 14px; border-radius: 2px;
  display: inline-block; margin-bottom: 24px;
}
.hero h1 {
  font-family: 'Zilla Slab', serif;
  font-weight: 700; font-size: clamp(3.5rem, 8vw, 7rem);
  line-height: .9; color: var(--terra); margin-bottom: 20px;
  letter-spacing: -.02em;
}
.hero h1 em { color: var(--orange); font-style: italic; }
.hero p.lead { font-size: 1.08rem; color: var(--text2); max-width: 640px; line-height: 1.82; font-weight: 600; }

/* ── STATS ────────────────────────────────────── */
.kpi-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.kpi {
  background: var(--card); border: 1.5px solid var(--border);
  border-radius: 4px; padding: 14px 20px; flex: 1; min-width: 130px;
  box-shadow: 2px 2px 0 var(--cream3);
  border-bottom: 3px solid var(--terra2);
}
.kpi.orange { border-bottom-color: var(--orange); }
.kpi.bile   { border-bottom-color: var(--bile); }
.kpi.azure  { border-bottom-color: var(--azure); }
.kpi .kv {
  font-family: 'Zilla Slab', serif; font-weight: 700;
  font-size: 1.9rem; color: var(--terra); line-height: 1; display: block;
}
.kpi.orange .kv { color: var(--orange); }
.kpi.bile .kv   { color: var(--bile); }
.kpi.azure .kv  { color: var(--azure); }
.kpi .kl { font-family:'Space Mono',monospace; font-size:.62rem; color:var(--muted); letter-spacing:.06em; text-transform:uppercase; margin-top:4px; }

/* ── LAYOUT ───────────────────────────────────── */
.container { max-width: 1240px; margin: 0 auto; padding: 62px 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: 70px; opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.section.visible { opacity: 1; transform: none; }
.sec-label { font-family:'Space Mono',monospace; font-size:.66rem; letter-spacing:.16em; text-transform:uppercase; color:var(--orange); margin-bottom:8px; }
.section h2 {
  font-family: 'Zilla Slab', serif; font-weight: 700;
  font-size: 2.1rem; color: var(--terra);
  padding-bottom: 12px; border-bottom: 2px solid var(--border); margin-bottom: 22px; position: relative;
}
.section h2::after { content:''; position:absolute; bottom:-2px; left:0; height:2px; width:64px; background:var(--orange); }
.section h3 { font-family:'Zilla Slab',serif; font-weight:600; font-size:1.2rem; color:var(--orange2); margin:24px 0 10px; }

/* ── ORGAN FLOW ───────────────────────────────── */
.organ-flow { display:flex; flex-direction:column; gap:0; margin:18px 0; position:relative; }
.organ-flow::before { content:''; position:absolute; left:22px; top:28px; bottom:28px; width:2px; background:linear-gradient(to bottom,var(--terra),var(--orange),var(--bile)); }
.organ-step { display:flex; gap:18px; margin-bottom:20px; align-items:flex-start; }
.organ-num {
  flex-shrink:0; width:44px; height:44px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  font-family:'Zilla Slab',serif; font-weight:700; font-size:1rem;
  position:relative; z-index:1; border:2px solid;
}
.organ-step:nth-child(1) .organ-num { background:rgba(124,45,18,.12); border-color:var(--terra);   color:var(--terra);   }
.organ-step:nth-child(2) .organ-num { background:rgba(146,64,14,.12); border-color:var(--brown);   color:var(--brown);   }
.organ-step:nth-child(3) .organ-num { background:rgba(234,88,12,.12); border-color:var(--orange2); color:var(--orange2); }
.organ-step:nth-child(4) .organ-num { background:rgba(234,88,12,.10); border-color:var(--orange);  color:var(--orange);  }
.organ-step:nth-child(5) .organ-num { background:rgba(21,128,61,.10); border-color:var(--bile);    color:var(--bile);    }
.organ-step:nth-child(6) .organ-num { background:rgba(21,102,49,.10); border-color:var(--bile2);   color:var(--bile2);   }
.organ-step:nth-child(7) .organ-num { background:rgba(29,78,216,.08); border-color:var(--azure);   color:var(--azure);   }
.organ-name { font-family:'Zilla Slab',serif; font-weight:700; color:var(--text); font-size:1.05rem; }
.organ-detail { font-size:.9rem; color:var(--text2); margin-top:3px; }

/* ── CARDS ────────────────────────────────────── */
.card {
  background: var(--card); border: 1.5px solid var(--border);
  border-radius: 4px; padding: 18px 22px; margin-bottom: 14px;
  box-shadow: 2px 2px 0 rgba(196,168,130,.2);
  transition: box-shadow .2s, transform .2s;
}
.card:hover { box-shadow: 4px 4px 0 rgba(196,168,130,.35); transform: translate(-1px,-1px); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 13px; margin: 16px 0; }

/* ── BOX ──────────────────────────────────────── */
.box { border-radius:4px; padding:13px 17px; margin:14px 0; border:1.5px solid; border-left:4px solid; font-size:.96rem; }
.box-terra  { background:rgba(124,45,18,.04);  border-color:var(--border); border-left-color:var(--terra);  }
.box-orange { background:rgba(234,88,12,.04);  border-color:var(--border); border-left-color:var(--orange); }
.box-bile   { background:rgba(21,128,61,.04);  border-color:var(--border); border-left-color:var(--bile);   }
.box-azure  { background:rgba(29,78,216,.04);  border-color:var(--border); border-left-color:var(--azure);  }
.box-warn   { background:rgba(190,18,60,.04);  border-color:var(--border); border-left-color:var(--rose);   }

/* ── TAG ──────────────────────────────────────── */
.tag { display:inline-block; padding:3px 10px; border-radius:3px; font-family:'Space Mono',monospace; font-size:.64rem; letter-spacing:.06em; text-transform:uppercase; margin-bottom:8px; font-weight:700; }
.tag-terra  { background:rgba(124,45,18,.08);  color:var(--terra);  border:1.5px solid rgba(124,45,18,.2);  }
.tag-orange { background:rgba(234,88,12,.08);  color:var(--orange); border:1.5px solid rgba(234,88,12,.2);  }
.tag-bile   { background:rgba(21,128,61,.08);  color:var(--bile);   border:1.5px solid rgba(21,128,61,.2);  }
.tag-azure  { background:rgba(29,78,216,.08);  color:var(--azure);  border:1.5px solid rgba(29,78,216,.2);  }
.tag-rose   { background:rgba(190,18,60,.08);  color:var(--rose);   border:1.5px solid rgba(190,18,60,.2);  }
.tag-brown  { background:rgba(146,64,14,.08);  color:var(--brown);  border:1.5px solid rgba(146,64,14,.2);  }

/* ── TABLE ────────────────────────────────────── */
table { width:100%; border-collapse:collapse; margin:12px 0; font-size:.92rem; }
th { background:var(--terra); color:#fff; font-family:'Space Mono',monospace; font-size:.67rem; letter-spacing:.08em; text-transform:uppercase; padding:9px 13px; text-align:left; }
td { padding:9px 13px; border-bottom:1.5px solid var(--border); color:var(--text2); vertical-align:top; }
tr:nth-child(even) td { background:var(--cream2); }
tr:hover td { background:rgba(234,88,12,.03); }

/* ── ENZYME TABLE SPECIAL ─────────────────────── */
.enzyme-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(180px,1fr)); gap:12px; margin:16px 0; }
.enz-card { background:var(--card); border:1.5px solid var(--border); border-radius:4px; padding:14px; border-top:3px solid var(--orange); }
.enz-name { font-family:'Zilla Slab',serif; font-weight:700; color:var(--terra); font-size:.95rem; margin-bottom:4px; }
.enz-source { font-family:'Space Mono',monospace; font-size:.62rem; color:var(--muted); letter-spacing:.04em; text-transform:uppercase; margin-bottom:6px; }
.enz-action { font-size:.83rem; color:var(--text2); line-height:1.55; }

/* ── 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(--terra),var(--bile)); }
.tl-item { position:relative; margin-bottom:20px; }
.tl-item::before { content:''; position:absolute; left:-35px; top:7px; width:8px; height:8px; background:var(--orange); border-radius:50%; border:2px solid var(--cream); box-shadow:0 0 0 2px var(--border); }
.tl-yr   { font-family:'Space Mono',monospace; font-size:.76rem; color:var(--orange); font-weight:700; }
.tl-who  { font-family:'Zilla Slab',serif; font-weight:700; color:var(--text); font-size:1rem; }
.tl-desc { font-size:.9rem; color:var(--text2); }

/* ── SIDEBAR ──────────────────────────────────── */
.sidebar { position:sticky; top:68px; }
.sb-card { background:var(--card); border:1.5px solid var(--border); border-radius:4px; padding:16px 18px; margin-bottom:12px; box-shadow:2px 2px 0 var(--cream3); }
.sb-card h3 { font-family:'Zilla Slab',serif; font-weight:700; font-size:.9rem; color:var(--terra); margin-bottom:10px; padding-bottom:8px; border-bottom:2px solid var(--terra); }
.sb-toc a { display:block; padding:5px 8px; font-family:'Space Mono',monospace; font-size:.66rem; color:var(--muted); text-decoration:none; border-radius:3px; transition:color .2s,background .2s; text-transform:uppercase; letter-spacing:.04em; }
.sb-toc a:hover, .sb-toc a.active { color:var(--terra); background:var(--light-o); }

ul { padding-left:22px; } li { margin:5px 0; } ul li::marker { color:var(--terra); }
strong { color:var(--text); font-weight:700; }
code { font-family:'Space Mono',monospace; background:var(--cream3); color:var(--terra); padding:2px 7px; border-radius:3px; font-size:.87em; font-weight:700; }

#back-top { position:fixed; bottom:28px; right:28px; width:44px; height:44px; background:var(--terra); color:var(--cream); border:none; border-radius:4px; cursor:pointer; font-family:'Zilla Slab',serif; font-size:1rem; font-weight:700; display:flex; align-items:center; justify-content:center; opacity:0; pointer-events:none; transition:opacity .3s,transform .3s; z-index:800; }
#back-top.visible { opacity:1; pointer-events:auto; }
#back-top:hover { transform:translateY(-4px); }

footer { border-top:2px solid var(--border); padding:26px 40px; text-align:center; color:var(--muted); font-family:'Space Mono',monospace; font-size:.7rem; letter-spacing:.08em; position:relative; z-index:1; background:var(--cream2); }

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