/* ============================================================
   evolution.css — Histoire Naturelle
   Palette : #1a1208 brun nuit | #e8a020 ambre | #c8b090 os | #6b4a1e bois
   Polices  : Unbounded (display) + Spectral (corps) + Courier Prime
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Unbounded:wght@400;700;900&family=Spectral:ital,wght@0,400;0,600;1,400&family=Courier+Prime:ital,wght@0,400;0,700;1,400&display=swap');

:root {
  --dark:    #1a1208;
  --dark2:   #221808;
  --dark3:   #2c2010;
  --card:    #221a0a;
  --border:  #3a2c14;
  --border2: #4a3c20;
  --amber:   #e8a020;
  --amber2:  #c88010;
  --amber3:  #f0c060;
  --bone:    #c8b090;
  --bone2:   #d4be9c;
  --wood:    #6b4a1e;
  --sage:    #7a9040;
  --rust:    #b04020;
  --text:    #c0a870;
  --text-hi: #f0e8d0;
  --muted:   #6a5030;
}

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

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

/* ── GEOLOGICAL STRATA OVERLAY ────────────────── */
body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    linear-gradient(180deg,
      rgba(232,160,32,.03) 0%,
      transparent 15%,
      rgba(107,74,30,.04) 30%,
      transparent 45%,
      rgba(232,160,32,.02) 60%,
      transparent 75%,
      rgba(107,74,30,.03) 90%,
      transparent 100%
    );
  pointer-events: none; z-index: 0;
}

/* ── AMBER GLOW ───────────────────────────────── */
body::after {
  content: '';
  position: fixed; top: -100px; right: -100px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(232,160,32,.08), transparent 70%);
  border-radius: 50%; 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(--wood), var(--amber), var(--amber3));
  z-index: 1000; transition: width .1s linear;
  box-shadow: 0 0 8px var(--amber2);
}

/* ── NAV ──────────────────────────────────────── */
nav {
  position: fixed; top: 4px; left: 0; right: 0; z-index: 900;
  background: rgba(26,18,8,.97); backdrop-filter: blur(16px);
  border-bottom: 2px solid var(--amber2);
  display: flex; align-items: center; gap: 2px;
  padding: 0 32px; height: 54px; overflow-x: auto;
}
.nav-brand {
  font-family: 'Unbounded', sans-serif; font-weight: 900; font-size: .9rem;
  color: var(--amber); text-decoration: none; letter-spacing: .08em;
  text-transform: uppercase; margin-right: 24px; flex-shrink: 0;
}
nav a:not(.nav-brand) {
  font-family: 'Courier Prime', monospace; font-size: .67rem;
  color: var(--muted); text-decoration: none; padding: 5px 11px;
  border-radius: 3px; white-space: nowrap;
  transition: color .2s, background .2s; letter-spacing: .05em; text-transform: uppercase;
}
nav a:not(.nav-brand):hover, nav a.active { color: var(--amber); background: rgba(232,160,32,.08); }

/* ── HERO ─────────────────────────────────────── */
.hero {
  position: relative; padding: 118px 60px 80px;
  overflow: hidden; z-index: 1;
  border-bottom: 2px solid var(--border2);
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 70% at 85% 50%, rgba(232,160,32,.1), transparent),
              radial-gradient(ellipse 40% 50% at 5% 70%, rgba(107,74,30,.12), transparent);
  pointer-events: none;
}
/* Geological strata lines */
.hero::after {
  content: '';
  position: absolute; right: 0; top: 0; bottom: 0; width: 8px;
  background: repeating-linear-gradient(0deg, var(--border) 0px, var(--border) 2px, var(--border2) 2px, var(--border2) 20px, var(--dark3) 20px, var(--dark3) 30px, var(--border) 30px);
  opacity: .5; pointer-events: none;
}

.hero-inner { max-width: 800px; position: relative; z-index: 2; }
.hero-era {
  font-family: 'Courier Prime', monospace; font-size: .7rem;
  letter-spacing: .2em; text-transform: uppercase;
  color: var(--amber3); display: inline-block; margin-bottom: 20px;
  border: 1px solid rgba(232,160,32,.3); padding: 5px 16px; border-radius: 2px;
  background: rgba(232,160,32,.05);
}
.hero h1 {
  font-family: 'Unbounded', sans-serif; font-weight: 900;
  font-size: clamp(2.8rem, 6.5vw, 6rem); line-height: .95;
  letter-spacing: -.01em; color: var(--text-hi); margin-bottom: 20px;
}
.hero h1 em { color: var(--amber); font-style: normal; display: block; font-size: .45em; letter-spacing: .08em; margin-top: 10px; font-weight: 400; font-family: 'Spectral', serif; font-style: italic; }
.hero .tagline { font-size: 1.05rem; color: var(--text); max-width: 640px; line-height: 1.85; font-style: italic; }

.hero-timeline-strip {
  display: flex; gap: 0; margin-top: 36px; padding-top: 28px;
  border-top: 1px solid var(--border2); overflow-x: auto;
}
.era-pill {
  padding: 10px 18px; text-align: center; border-right: 1px solid var(--border);
  flex-shrink: 0;
}
.era-pill:last-child { border-right: none; }
.ep-age { font-family: 'Unbounded', sans-serif; font-size: .85rem; font-weight: 700; color: var(--amber); display: block; }
.ep-name { font-family: 'Courier Prime', monospace; font-size: .62rem; color: var(--muted); letter-spacing: .06em; text-transform: uppercase; margin-top: 2px; }

/* ── LAYOUT ───────────────────────────────────── */
.container { max-width: 1240px; margin: 0 auto; padding: 64px 40px; position: relative; z-index: 1; }
.two-col { display: grid; grid-template-columns: 1fr 300px; 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-era { font-family: 'Courier Prime', monospace; font-size: .65rem; letter-spacing: .18em; text-transform: uppercase; color: var(--amber2); margin-bottom: 8px; }
.section h2 {
  font-family: 'Unbounded', sans-serif; font-size: 1.6rem; font-weight: 900;
  color: var(--text-hi); padding-bottom: 14px;
  border-bottom: 2px solid var(--border2); margin-bottom: 22px; position: relative;
}
.section h2::after { content:''; position:absolute; bottom:-2px; left:0; height:2px; width:52px; background:var(--amber); }
.section h3 { font-family: 'Spectral', serif; font-weight: 600; font-size: 1.2rem; color: var(--amber3); margin: 26px 0 10px; }

/* ── CARDS ────────────────────────────────────── */
.card { background: var(--card); border: 1px solid var(--border2); border-radius: 8px; padding: 20px 24px; margin-bottom: 16px; transition: border-color .2s, transform .2s; box-shadow: 0 2px 8px rgba(0,0,0,.3); }
.card:hover { border-color: rgba(232,160,32,.4); transform: translateY(-2px); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; margin: 18px 0; }

/* ── FORCE CARDS (mécanismes) ─────────────────── */
.force-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; margin: 20px 0; }
.force-card { background: var(--dark3); border: 1px solid var(--border2); border-radius: 8px; padding: 18px; transition: transform .2s; cursor: default; }
.force-card:hover { transform: translateY(-4px); border-color: var(--amber2); }
.fc-icon { font-size: 2rem; display: block; margin-bottom: 10px; }
.fc-name { font-family: 'Unbounded', sans-serif; font-size: .85rem; font-weight: 700; color: var(--amber); margin-bottom: 6px; }
.fc-desc { font-size: .85rem; color: var(--text); line-height: 1.6; }

/* ── TAGS ─────────────────────────────────────── */
.tag { display:inline-block; padding:3px 10px; border-radius:3px; font-family:'Courier Prime',monospace; font-size:.64rem; letter-spacing:.06em; text-transform:uppercase; margin-bottom:8px; }
.tag-amber { background:rgba(232,160,32,.1); color:var(--amber3); border:1px solid rgba(232,160,32,.25); }
.tag-bone  { background:rgba(200,176,144,.08);color:var(--bone2); border:1px solid rgba(200,176,144,.2); }
.tag-rust  { background:rgba(176,64,32,.1);  color:#e07050;     border:1px solid rgba(176,64,32,.25); }
.tag-sage  { background:rgba(122,144,64,.1); color:#a0c060;     border:1px solid rgba(122,144,64,.25); }

/* ── BOX ──────────────────────────────────────── */
.box { border-radius: 6px; padding: 14px 18px; margin: 16px 0; border-left: 4px solid; font-size: .96rem; }
.box-amber { background: rgba(232,160,32,.05); border-color: var(--amber); }
.box-bone  { background: rgba(200,176,144,.04);border-color: var(--bone); }
.box-rust  { background: rgba(176,64,32,.06);  border-color: var(--rust); }
.box-sage  { background: rgba(122,144,64,.06); border-color: var(--sage); }

/* ── TABLE ────────────────────────────────────── */
table { width:100%; border-collapse:collapse; margin:14px 0; font-size:.92rem; }
th { background:var(--dark3); color:var(--amber3); font-family:'Courier Prime',monospace; font-size:.67rem; letter-spacing:.08em; text-transform:uppercase; padding:10px 14px; text-align:left; border-bottom:1px solid var(--border2); }
td { padding:10px 14px; border-bottom:1px solid var(--border); color:var(--text); vertical-align:top; }
tr:hover td { background:rgba(232,160,32,.03); }

/* ── GEOLOGICAL TIMELINE ──────────────────────── */
.geo-timeline { position: relative; margin: 20px 0; }
.geo-timeline::before { content:''; position:absolute; left:0; top:0; bottom:0; width:6px; background: linear-gradient(to bottom, #A8D5E2 0%, #7EC8E3 8%, #E8D5A8 15%, #D4A060 30%, #C08040 45%, #B07040 60%, #A06030 75%, #806030 90%, #604820 100%); border-radius:3px; }
.geo-item { padding: 14px 14px 14px 24px; border-bottom: 1px solid var(--border); position: relative; }
.geo-item::before { content:''; position:absolute; left:1px; top:50%; transform:translateY(-50%); width:4px; height:4px; background:var(--amber); border-radius:50%; }
.geo-age  { font-family:'Unbounded',sans-serif; font-size:.8rem; font-weight:700; color:var(--amber); }
.geo-period { font-family:'Courier Prime',monospace; font-size:.65rem; color:var(--muted); letter-spacing:.06em; text-transform:uppercase; }
.geo-event { font-size:.9rem; color:var(--text); margin-top:4px; }

/* ── SIDEBAR ──────────────────────────────────── */
.sidebar { position: sticky; top: 68px; }
.sb-card { background: var(--card); border: 1px solid var(--border2); border-radius: 8px; padding: 18px 20px; margin-bottom: 16px; }
.sb-card h3 { font-family:'Unbounded',sans-serif; font-size:.8rem; font-weight:700; color:var(--amber); margin-bottom:12px; padding-bottom:8px; border-bottom:1px solid var(--border2); letter-spacing:.06em; }
.sb-toc a { display:block; padding:5px 8px; font-family:'Courier Prime',monospace; font-size:.67rem; color:var(--muted); text-decoration:none; border-radius:3px; transition:color .2s, background .2s; letter-spacing:.04em; }
.sb-toc a:hover, .sb-toc a.active { color:var(--amber); background:rgba(232,160,32,.07); }

ul { padding-left:22px; } li { margin:5px 0; }
ul li::marker { color:var(--amber2); }
strong { color:var(--text-hi); font-weight:600; }
em.sci { font-style:italic; color:var(--bone2); }
code { font-family:'Courier Prime',monospace; background:var(--dark3); color:var(--amber3); padding:2px 7px; border-radius:3px; font-size:.87em; }

#back-top { position:fixed; bottom:28px; right:28px; width:44px; height:44px; background:var(--wood); color:var(--amber); border:1px solid var(--amber2); border-radius:50%; cursor:pointer; font-size:1.2rem; 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 { background:var(--dark2); border-top:2px solid var(--border2); padding:28px 40px; text-align:center; color:var(--muted); font-family:'Courier Prime',monospace; font-size:.68rem; letter-spacing:.08em; position:relative; z-index:1; }

@media (max-width:768px) { .hero{padding:90px 22px 50px;} .container{padding:36px 18px;} nav{padding:0 14px;} }