/* ==========================================================================
   ORIGINES — feuille de style
   Un site sur les origines de la vie.
   Système : mode sombre par défaut, vert tendre + lilas, typographie sérif
   double (Fraunces / Literata), accents mono (IBM Plex Mono).
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root{
  color-scheme: dark;

  /* Surfaces — "basalte mousse", jamais noir pur */
  --bg: #0E1512;
  --bg-1: #131C17;
  --bg-2: #18231C;
  --bg-3: #1E2B23;
  --scrim: rgba(10, 15, 12, 0.72);

  /* Texte */
  --text-0: #ECF2EC;
  --text-1: #C9D4CB;
  --text-2: #9FAEA2;
  --text-3: #71806F58;
  --text-3: #7C8C7C;

  /* Accents — vert tendre & lilas, à parts égales */
  --green-000: #E4F1E6;
  --green-100: #B9D9BF;
  --green-300: #93C29E;
  --green-500: #74AD82;
  --green-700: #4C7A58;
  --green-tint: rgba(116, 173, 130, 0.12);
  --green-tint-strong: rgba(116, 173, 130, 0.22);

  --lilac-000: #EFEAF8;
  --lilac-100: #D3C4EC;
  --lilac-300: #B6A0DE;
  --lilac-500: #9C82CC;
  --lilac-700: #6C579C;
  --lilac-tint: rgba(156, 130, 204, 0.13);
  --lilac-tint-strong: rgba(156, 130, 204, 0.24);

  /* Étincelle rare — réservée à l'illustration de la spirale du temps */
  --ember: #D9B36C;

  /* Lignes */
  --line: rgba(236, 242, 236, 0.10);
  --line-strong: rgba(236, 242, 236, 0.20);

  /* Typo */
  --font-display: 'Fraunces', ui-serif, Georgia, 'Iowan Old Style', serif;
  --font-body: 'Literata', ui-serif, Georgia, serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  --fs-hero: clamp(2.6rem, 3.4vw + 1.6rem, 5rem);
  --fs-h1: clamp(2.1rem, 1.6vw + 1.5rem, 3.1rem);
  --fs-h2: clamp(1.5rem, 0.9vw + 1.2rem, 2.05rem);
  --fs-h3: clamp(1.2rem, 0.4vw + 1.05rem, 1.45rem);
  --fs-lede: clamp(1.15rem, 0.4vw + 1.05rem, 1.4rem);
  --fs-body: 1.0625rem;
  --fs-small: 0.9rem;
  --fs-mini: 0.78rem;

  --measure: 42rem;
  --measure-wide: 62rem;
  --shell: min(90rem, 92vw);

  --radius-s: 6px;
  --radius-m: 12px;
  --radius-l: 22px;

  --ease: cubic-bezier(.22,.61,.36,1);
  --dur-1: 180ms;
  --dur-2: 420ms;

  --shadow-1: 0 1px 0 rgba(0,0,0,.2);
  --shadow-2: 0 18px 50px -22px rgba(0,0,0,.6);
}

/* Mode clair (bascule volontaire — sombre reste le défaut) */
:root[data-theme="light"]{
  color-scheme: light;
  --bg: #F6F4EC;
  --bg-1: #FFFFFF;
  --bg-2: #EFEBDD;
  --bg-3: #E7E2D0;
  --scrim: rgba(246, 244, 236, 0.78);

  --text-0: #1A2119;
  --text-1: #333F32;
  --text-2: #5B685A;
  --text-3: #808F7E;

  --green-000: #EAF3EC;
  --green-100: #CDE4D2;
  --green-300: #8FBE9C;
  --green-500: #4C8360;
  --green-700: #2F5A3B;
  --green-tint: rgba(76, 131, 96, 0.10);
  --green-tint-strong: rgba(76, 131, 96, 0.18);

  --lilac-000: #F1ECFA;
  --lilac-100: #DCCEF0;
  --lilac-300: #A98FD6;
  --lilac-500: #7A5CB0;
  --lilac-700: #523C7A;
  --lilac-tint: rgba(122, 92, 176, 0.10);
  --lilac-tint-strong: rgba(122, 92, 176, 0.18);

  --line: rgba(26, 33, 25, 0.12);
  --line-strong: rgba(26, 33, 25, 0.24);
  --shadow-2: 0 18px 50px -26px rgba(30,30,20,.35);
}

*, *::before, *::after{ box-sizing: border-box; }
html{
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}
body{ overflow-x: hidden; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

body{
  margin: 0;
  background:
    radial-gradient(1200px 700px at 82% -8%, var(--lilac-tint), transparent 60%),
    radial-gradient(1000px 600px at -10% 12%, var(--green-tint), transparent 55%),
    var(--bg);
  color: var(--text-1);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color var(--dur-2) var(--ease), color var(--dur-2) var(--ease);
}

::selection{ background: var(--lilac-tint-strong); color: var(--text-0); }

h1,h2,h3,h4{
  font-family: var(--font-display);
  color: var(--text-0);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
  font-variation-settings: 'SOFT' 20, 'opsz' 40;
}
h1{ font-size: var(--fs-h1); font-weight: 560; }
h2{ font-size: var(--fs-h2); font-weight: 560; }
h3{ font-size: var(--fs-h3); font-weight: 600; }

p{ margin: 0 0 1.15em; }
a{ color: var(--green-300); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover{ color: var(--green-100); }
:root[data-theme="light"] a{ color: var(--green-700); }
:root[data-theme="light"] a:hover{ color: var(--green-500); }

a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible, [tabindex]:focus-visible{
  outline: 2px solid var(--lilac-300);
  outline-offset: 3px;
  border-radius: 3px;
}

img, svg{ max-width: 100%; display: block; }

.mono{ font-family: var(--font-mono); letter-spacing: 0.02em; }

/* ---------- 2. Structure de base ---------- */
.shell{ width: var(--shell); margin-inline: auto; }
main{ display: block; }

.skip-link{
  position: fixed; top: -100px; left: 1rem; z-index: 2000;
  background: var(--green-500); color: #0E1512; font-family: var(--font-mono);
  font-size: var(--fs-mini); padding: 0.7em 1em; border-radius: var(--radius-s);
  transition: top var(--dur-1) var(--ease);
}
.skip-link:focus{ top: 1rem; }

/* Barre de progression de lecture */
#reading-progress{
  position: fixed; inset: 0 0 auto 0; height: 3px; z-index: 1000;
  background: linear-gradient(90deg, var(--green-500), var(--lilac-500));
  width: 0%;
  transform-origin: left;
}

/* ---------- 3. En-tête / navigation ---------- */
.site-header{
  position: sticky; top: 0; z-index: 900;
  background: var(--scrim);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  border-bottom: 1px solid var(--line);
}
.site-header .bar{
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.85rem 0;
}
.brand{
  display: flex; align-items: center; gap: 0.6em;
  font-family: var(--font-display); font-size: 1.18rem; color: var(--text-0);
  text-decoration: none; font-weight: 600; letter-spacing: -0.01em;
  white-space: nowrap;
}
.brand:hover{ color: var(--text-0); }
.brand .mark{ width: 22px; height: 22px; flex: none; }
.brand .sur{ color: var(--text-2); font-family: var(--font-mono); font-size: 0.62em; letter-spacing: 0.14em; text-transform: uppercase; display: block; margin-top: 0.1em; font-weight: 500; }
.brand-stack{ display:flex; flex-direction: column; line-height: 1.05; }

nav.primary{ display: flex; align-items: center; gap: 1.6rem; }
nav.primary a{
  color: var(--text-2); text-decoration: none; font-size: 0.92rem;
  padding: 0.3em 0.05em; position: relative; white-space: nowrap;
}
nav.primary a::after{
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 1.5px;
  background: linear-gradient(90deg, var(--green-300), var(--lilac-300));
  transition: right var(--dur-2) var(--ease);
}
nav.primary a:hover{ color: var(--text-0); }
nav.primary a:hover::after{ right: 0; }
nav.primary a[aria-current="page"]{ color: var(--text-0); }
nav.primary a[aria-current="page"]::after{ right: 0; }

.header-tools{ display: flex; align-items: center; gap: 0.6rem; }
.theme-toggle, .nav-toggle{
  appearance: none; border: 1px solid var(--line-strong); background: transparent;
  color: var(--text-1); width: 38px; height: 38px; border-radius: 999px;
  display: inline-flex; align-items: center; justify-content: center; cursor: pointer;
  transition: border-color var(--dur-1) var(--ease), color var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
}
.theme-toggle:hover, .nav-toggle:hover{ border-color: var(--green-300); color: var(--green-100); }
.theme-toggle svg{ width: 17px; height: 17px; }
.theme-toggle .i-sun{ display: none; }
:root[data-theme="light"] .theme-toggle .i-moon{ display: none; }
:root[data-theme="light"] .theme-toggle .i-sun{ display: block; }

.nav-toggle{ display: none; }

@media (max-width: 860px){
  nav.primary{
    position: fixed; inset: 0 0 0 auto; width: min(78vw, 320px);
    background: var(--bg-1); border-left: 1px solid var(--line);
    flex-direction: column; align-items: flex-start; gap: 0;
    padding: 5.2rem 1.6rem 2rem; transform: translateX(100%);
    transition: transform var(--dur-2) var(--ease); overflow-y: auto;
  }
  nav.primary a{ width: 100%; padding: 0.85em 0; border-bottom: 1px solid var(--line); font-size: 1.02rem; }
  nav.primary[data-open="true"]{ transform: translateX(0); box-shadow: var(--shadow-2); }
  .nav-toggle{ display: inline-flex; }
  .nav-scrim{
    position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 850;
    opacity: 0; pointer-events: none; transition: opacity var(--dur-2) var(--ease);
  }
  .nav-scrim[data-open="true"]{ opacity: 1; pointer-events: auto; }
}

/* ---------- 4. Eyebrow / labels ---------- */
.eyebrow{
  display: inline-flex; align-items: center; gap: 0.55em;
  font-family: var(--font-mono); font-size: var(--fs-mini);
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-2);
  margin: 0 0 1.1em;
}
.eyebrow .dot{ width: 6px; height: 6px; border-radius: 50%; background: var(--green-300); flex: none; }
.eyebrow.lilac .dot{ background: var(--lilac-300); }
.eyebrow .spiral{ width: 15px; height: 15px; flex: none; opacity: 0.9; }

/* ---------- 5. Boutons / liens d'action ---------- */
.btn{
  display: inline-flex; align-items: center; gap: 0.6em;
  font-family: var(--font-mono); font-size: 0.82rem; letter-spacing: 0.04em;
  text-decoration: none; padding: 0.85em 1.3em; border-radius: 999px;
  border: 1px solid var(--line-strong); color: var(--text-0);
  transition: transform var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
  white-space: nowrap;
}
.btn:hover{ transform: translateY(-1px); border-color: var(--green-300); color: var(--text-0); }
.btn.primary{
  background: linear-gradient(135deg, var(--green-500), var(--lilac-500));
  border-color: transparent; color: #0B120E; font-weight: 600;
}
.btn.primary:hover{ filter: brightness(1.08); }
.btn.ghost{ background: transparent; }
.btn svg{ width: 15px; height: 15px; }

/* ---------- 6. Hero ---------- */
.hero{
  position: relative; padding: clamp(3.5rem, 8vw, 7.5rem) 0 clamp(3rem, 6vw, 5rem);
  overflow: hidden;
}
.hero-grid{
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 3rem; align-items: center;
}
.hero h1{ font-size: var(--fs-hero); margin-bottom: 0.42em; max-width: 14ch; }
.hero .lede{ font-size: var(--fs-lede); color: var(--text-1); max-width: 34em; margin-bottom: 1.7em; }
.hero .accent{
  background: linear-gradient(100deg, var(--green-300), var(--lilac-300) 70%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-actions{ display: flex; flex-wrap: wrap; gap: 0.85rem; }
.hero-art{ position: relative; }
.hero-art svg{ width: 100%; height: auto; }

@media (max-width: 900px){
  .hero-grid{ grid-template-columns: 1fr; }
  .hero-art{ order: -1; max-width: 320px; margin-inline: auto; opacity: .9; }
}

/* ---------- 7. Bandeau temps profond (signature) ---------- */
.deep-time{
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  padding: 2.2rem 0; overflow-x: auto; scrollbar-width: thin;
}
.deep-time-track{
  display: flex; align-items: flex-end; gap: 0; min-width: 760px; position: relative;
  padding-top: 1.6rem;
}
.deep-time-track::before{
  content: ""; position: absolute; left: 0; right: 0; top: 2.55rem; height: 1px;
  background: linear-gradient(90deg, var(--lilac-300), var(--line) 8%, var(--line) 92%, var(--green-300));
}
.dt-node{ flex: 1; position: relative; text-align: center; padding-top: 0; }
.dt-node .pt{
  width: 9px; height: 9px; border-radius: 50%; margin: 0 auto 0.7rem;
  background: var(--bg); border: 2px solid var(--green-300); position: relative; z-index: 2;
}
.dt-node:nth-child(odd) .pt{ border-color: var(--lilac-300); }
.dt-node .ga{ font-family: var(--font-mono); font-size: var(--fs-mini); color: var(--text-2); display: block; }
.dt-node .label{ font-size: 0.86rem; color: var(--text-1); margin-top: 0.25rem; max-width: 12ch; margin-inline: auto; }

/* ---------- 8. Grille de chapitres (cartes) ---------- */
.chapters{ padding: clamp(3rem, 6vw, 5.5rem) 0; }
.section-head{ max-width: 40em; margin-bottom: 2.6rem; }
.section-head h2{ margin-bottom: 0.4em; }
.section-head p{ color: var(--text-2); font-size: var(--fs-lede); margin: 0; }

.card-grid{
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem;
}
@media (max-width: 980px){ .card-grid{ grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px){ .card-grid{ grid-template-columns: 1fr; } }

.chapter-card{
  display: flex; flex-direction: column; gap: 0.9rem;
  background: var(--bg-1); border: 1px solid var(--line); border-radius: var(--radius-m);
  padding: 1.6rem 1.5rem 1.8rem; text-decoration: none; color: var(--text-1);
  transition: border-color var(--dur-1) var(--ease), transform var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
  position: relative; overflow: hidden;
}
.chapter-card::before{
  content: ""; position: absolute; inset: -1px -1px auto -1px; height: 3px;
  background: linear-gradient(90deg, var(--green-300), var(--lilac-300));
  transform: scaleX(0); transform-origin: left; transition: transform var(--dur-2) var(--ease);
}
.chapter-card:hover{ transform: translateY(-3px); border-color: var(--line-strong); background: var(--bg-2); color: var(--text-1); }
.chapter-card:hover::before{ transform: scaleX(1); }
.chapter-card .num{ font-family: var(--font-mono); font-size: var(--fs-mini); color: var(--text-2); }
.chapter-card h3{ margin: 0; font-size: 1.28rem; }
.chapter-card p{ margin: 0; color: var(--text-2); font-size: 0.94rem; flex: 1; }
.chapter-card .go{ font-family: var(--font-mono); font-size: var(--fs-mini); color: var(--green-300); display: inline-flex; align-items: center; gap: 0.4em; }
:root[data-theme="light"] .chapter-card .go{ color: var(--green-700); }

/* ---------- 9. Vidéo ---------- */
.video-section{ padding: clamp(2.5rem, 5vw, 4rem) 0; }
.video-wrap{
  max-width: 52rem; margin-inline: auto; border-radius: var(--radius-l);
  overflow: hidden; border: 1px solid var(--line); background: var(--bg-1);
}
.video-frame{ position: relative; aspect-ratio: 16 / 9; background: var(--bg-2); }
.video-frame iframe{ position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-placeholder{
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center; gap: 1rem;
  padding: 2rem; cursor: pointer; border: 0; width: 100%; height: 100%;
  background:
    radial-gradient(560px 320px at 50% 20%, var(--lilac-tint), transparent 65%),
    radial-gradient(560px 320px at 20% 90%, var(--green-tint), transparent 60%),
    var(--bg-2);
  color: var(--text-1); font-family: var(--font-body);
}
.video-placeholder .play{
  width: 62px; height: 62px; border-radius: 50%;
  background: linear-gradient(135deg, var(--green-500), var(--lilac-500));
  display: flex; align-items: center; justify-content: center;
  transition: transform var(--dur-1) var(--ease);
}
.video-placeholder:hover .play{ transform: scale(1.06); }
.video-placeholder .play svg{ width: 20px; height: 20px; fill: #0B120E; margin-left: 3px; }
.video-placeholder strong{ font-family: var(--font-display); font-size: 1.2rem; color: var(--text-0); font-weight: 600; }
.video-placeholder span{ color: var(--text-2); font-size: 0.92rem; max-width: 32em; }
.video-placeholder.is-static{ cursor: default; }
.video-placeholder.is-static .play{ opacity: 0.55; }
.video-placeholder.is-static:hover .play{ transform: none; }
.video-caption{ padding: 1.1rem 1.4rem; border-top: 1px solid var(--line); font-size: 0.9rem; color: var(--text-2); }

/* ---------- 10. Article / prose longue ---------- */
.page-header{
  padding: clamp(2.6rem, 6vw, 4.5rem) 0 2rem; border-bottom: 1px solid var(--line);
}
.breadcrumb{
  display: flex; flex-wrap: wrap; gap: 0.4em; align-items: center;
  font-family: var(--font-mono); font-size: var(--fs-mini); color: var(--text-2);
  margin-bottom: 1.6rem; list-style: none; padding: 0;
}
.breadcrumb li{ display: flex; align-items: center; gap: 0.4em; }
.breadcrumb a{ color: var(--text-2); text-decoration: none; }
.breadcrumb a:hover{ color: var(--green-300); }
.breadcrumb .sep{ opacity: 0.5; }
.breadcrumb [aria-current]{ color: var(--text-1); }

.page-header h1{ max-width: 22ch; }
.page-lede{ font-size: var(--fs-lede); color: var(--text-1); max-width: 42em; }
.page-meta{
  display: flex; flex-wrap: wrap; gap: 1.4rem; margin-top: 1.8rem;
  font-family: var(--font-mono); font-size: var(--fs-mini); color: var(--text-2);
}
.page-meta span{ display: flex; align-items: center; gap: 0.5em; }
.page-meta svg{ width: 14px; height: 14px; opacity: 0.8; }

.article-layout{
  display: grid; grid-template-columns: minmax(0,1fr) 15.5rem; gap: 3.5rem;
  padding: clamp(2.6rem, 5vw, 4rem) 0 clamp(4rem, 8vw, 6rem); align-items: start;
}
@media (max-width: 980px){ .article-layout{ grid-template-columns: 1fr; } .toc{ display: none; } }

.prose{ max-width: var(--measure); font-size: 1.06rem; }
.prose > *:first-child{ margin-top: 0; }
.prose h2{
  margin-top: 2.5em; padding-top: 0.2em; scroll-margin-top: 6rem;
}
.prose h2 .h-num{ color: var(--text-2); font-family: var(--font-mono); font-size: 0.5em; letter-spacing: 0.1em; display: block; margin-bottom: 0.5em; font-weight: 500; }
.prose h3{ margin-top: 1.9em; scroll-margin-top: 6rem; color: var(--green-100); }
:root[data-theme="light"] .prose h3{ color: var(--green-700); }
.prose p{ color: var(--text-1); }
.prose p.lede-p{ font-size: 1.18em; color: var(--text-0); }
.prose ul, .prose ol{ padding-left: 1.3em; margin: 0 0 1.3em; color: var(--text-1); }
.prose li{ margin-bottom: 0.5em; }
.prose li::marker{ color: var(--green-300); }
.prose strong{ color: var(--text-0); font-weight: 650; }
.prose em{ color: var(--text-1); }

.prose blockquote{
  margin: 1.8em 0; padding: 0.2em 0 0.2em 1.3em; border-left: 2px solid var(--lilac-300);
  font-family: var(--font-display); font-size: 1.28em; line-height: 1.45; color: var(--text-0);
  font-style: italic;
}
.prose blockquote cite{ display: block; font-family: var(--font-mono); font-size: 0.42em; font-style: normal; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-2); margin-top: 0.8em; }

.callout{
  margin: 1.9em 0; padding: 1.3rem 1.5rem; border-radius: var(--radius-m);
  border: 1px solid var(--line); background: var(--bg-1); position: relative;
}
.callout.green{ border-color: var(--green-tint-strong); background: linear-gradient(180deg, var(--green-tint), transparent 60%), var(--bg-1); }
.callout.lilac{ border-color: var(--lilac-tint-strong); background: linear-gradient(180deg, var(--lilac-tint), transparent 60%), var(--bg-1); }
.callout .label{ font-family: var(--font-mono); font-size: var(--fs-mini); letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-2); margin-bottom: 0.6em; display: block; }
.callout p:last-child{ margin-bottom: 0; }
.callout p{ font-size: 0.97rem; }

figure{ margin: 2em 0; }
figure.diagram{
  border: 1px solid var(--line); border-radius: var(--radius-m); background: var(--bg-1);
  padding: 1.4rem;
}
figcaption{ font-family: var(--font-mono); font-size: var(--fs-mini); color: var(--text-2); margin-top: 0.9em; }

.table-wrap{ overflow-x: auto; margin: 1.9em 0; border: 1px solid var(--line); border-radius: var(--radius-m); }
table{ width: 100%; border-collapse: collapse; font-size: 0.92rem; min-width: 560px; }
thead th{
  text-align: left; font-family: var(--font-mono); font-size: var(--fs-mini); letter-spacing: 0.05em;
  text-transform: uppercase; color: var(--text-2); padding: 0.9em 1.1em; border-bottom: 1px solid var(--line-strong);
  background: var(--bg-1);
}
tbody td{ padding: 0.9em 1.1em; border-bottom: 1px solid var(--line); vertical-align: top; color: var(--text-1); }
tbody tr:last-child td{ border-bottom: none; }
tbody tr:hover{ background: var(--bg-1); }

hr.divider{ border: 0; border-top: 1px solid var(--line); margin: 2.6em 0; }

.def-list{ display: grid; gap: 1rem; margin: 1.8em 0; }
.def-item{ display: grid; grid-template-columns: 9.5rem 1fr; gap: 1rem; padding-bottom: 1rem; border-bottom: 1px solid var(--line); }
.def-item dt{ font-family: var(--font-mono); font-size: 0.82rem; color: var(--green-300); }
:root[data-theme="light"] .def-item dt{ color: var(--green-700); }
.def-item dd{ margin: 0; color: var(--text-1); font-size: 0.96rem; }
@media (max-width: 620px){ .def-item{ grid-template-columns: 1fr; gap: 0.3rem; } }

/* Table des matières latérale */
.toc{ position: sticky; top: 6rem; font-size: 0.86rem; }
.toc .eyebrow{ margin-bottom: 1rem; }
.toc ol{ list-style: none; margin: 0; padding: 0; display: grid; gap: 0.1rem; border-left: 1px solid var(--line); }
.toc li a{
  display: block; padding: 0.45em 0 0.45em 1rem; color: var(--text-2); text-decoration: none;
  border-left: 2px solid transparent; margin-left: -1px; transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}
.toc li a:hover{ color: var(--text-0); }
.toc li a.active{ color: var(--green-100); border-left-color: var(--green-300); }
:root[data-theme="light"] .toc li a.active{ color: var(--green-700); }

/* ---------- 11. Notes / sources en fin d'article ---------- */
.sources-block{ margin-top: 3.5rem; padding-top: 2.2rem; border-top: 1px solid var(--line); }
.sources-block h2{ font-size: 1.05rem; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-2); font-weight: 500; }
.sources-block ol{ columns: 1; padding-left: 1.2em; color: var(--text-2); font-size: 0.86rem; line-height: 1.8; }
.sources-block li{ overflow-wrap: anywhere; word-break: break-word; }
.sources-block a{ color: var(--text-2); overflow-wrap: anywhere; word-break: break-word; }
.sources-block a:hover{ color: var(--green-300); }

/* ---------- 12. Prochain chapitre ---------- */
.up-next{
  display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line);
}
.up-next a{
  padding: 2.4rem var(--shell-gap, 0) ; text-decoration: none; color: var(--text-1);
  display: flex; flex-direction: column; gap: 0.5rem; transition: background var(--dur-1) var(--ease);
}
.up-next .shell-pad{ width: var(--shell); margin-inline: auto; padding: 2.4rem 0; }
.up-next a:hover{ background: var(--bg-1); }
.up-next a:hover .shell-pad{ }
.up-next .prev{ border-right: 1px solid var(--line); text-align: left; }
.up-next .next{ text-align: right; }
.up-next .next .shell-pad{ margin-left: auto; align-items: flex-end; display: flex; flex-direction: column; }
.up-next .prev .shell-pad{ margin-right: auto; }
.up-next .dir{ font-family: var(--font-mono); font-size: var(--fs-mini); color: var(--text-2); text-transform: uppercase; letter-spacing: 0.1em; }
.up-next .title{ font-family: var(--font-display); font-size: 1.25rem; color: var(--text-0); max-width: 22ch; }
@media (max-width: 700px){
  .up-next{ grid-template-columns: 1fr; }
  .up-next .prev{ border-right: 0; border-bottom: 1px solid var(--line); }
  .up-next .next .shell-pad{ align-items: flex-start; margin-left: 0; text-align: left; }
}

/* ---------- 13. Section générique / bloc pleine largeur ---------- */
.band{ padding: clamp(3rem, 6vw, 5.5rem) 0; }
.band.alt{ background: var(--bg-1); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.two-col{ display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; }
@media (max-width: 860px){ .two-col{ grid-template-columns: 1fr; } }

.pill{
  display: inline-flex; align-items: center; gap: 0.4em; font-family: var(--font-mono);
  font-size: var(--fs-mini); padding: 0.35em 0.8em; border-radius: 999px;
  border: 1px solid var(--line-strong); color: var(--text-2);
}

/* ---------- 14. Pied de page ---------- */
.site-footer{ border-top: 1px solid var(--line); padding: 3.4rem 0 2.4rem; margin-top: 2rem; }
.footer-grid{ display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 2.4rem; }
@media (max-width: 800px){ .footer-grid{ grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px){ .footer-grid{ grid-template-columns: 1fr; } }
.footer-grid h4{ font-family: var(--font-mono); font-size: var(--fs-mini); text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-2); font-weight: 500; margin-bottom: 1rem; }
.footer-grid ul{ list-style: none; padding: 0; margin: 0; display: grid; gap: 0.65rem; }
.footer-grid a{ color: var(--text-1); text-decoration: none; font-size: 0.92rem; }
.footer-grid a:hover{ color: var(--green-300); }
.footer-about p{ color: var(--text-2); font-size: 0.92rem; max-width: 30em; }
.footer-bottom{
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center;
  gap: 1rem; margin-top: 2.8rem; padding-top: 1.6rem; border-top: 1px solid var(--line);
  font-size: 0.82rem; color: var(--text-3);
}
.footer-bottom .signature{ display: flex; align-items: center; gap: 0.5em; }
.footer-bottom a{ color: var(--text-2); }

/* ---------- 15. Utilitaires ---------- */
.visually-hidden{
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.reveal{ opacity: 0; transform: translateY(14px); transition: opacity 700ms var(--ease), transform 700ms var(--ease); }
.reveal.in{ opacity: 1; transform: translateY(0); }

.back-to-top{
  position: fixed; right: 1.4rem; bottom: 1.4rem; width: 44px; height: 44px; border-radius: 50%;
  background: var(--bg-1); border: 1px solid var(--line-strong); color: var(--text-1);
  display: flex; align-items: center; justify-content: center; cursor: pointer;
  opacity: 0; pointer-events: none; transform: translateY(8px);
  transition: opacity var(--dur-1) var(--ease), transform var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
  z-index: 500;
}
.back-to-top.show{ opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top:hover{ border-color: var(--green-300); }
.back-to-top svg{ width: 16px; height: 16px; }

/* Page 404 */
.error-page{ min-height: 60vh; display: flex; align-items: center; }
.error-page .shell{ text-align: center; }

/* Ancrage pour titres avec lien */
.anchor-link{ opacity: 0; margin-left: 0.5em; color: var(--text-2); text-decoration: none; font-size: 0.8em; }
h2:hover .anchor-link, h3:hover .anchor-link{ opacity: 1; }