/* ============================================================
   adn.css — Terminal Bioinformatique
   Palette : #07090f nuit | #3b82f6 A-bleu | #10b981 T-vert | #f59e0b C-ambre | #ef4444 G-rouge
   Polices  : IBM Plex Mono (display terminal) + Barlow (corps) + Barlow Condensed
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,400;0,600;1,400&family=Barlow:wght@400;500;600&family=Barlow+Condensed:wght@500;600;700&display=swap');

:root {
  --void:   #07090f;
  --void2:  #0b0e18;
  --void3:  #111522;
  --card:   #0d1020;
  --border: #1c2340;
  --border2:#243060;
  --base-a: #3b82f6;   /* Adénine — bleu */
  --base-t: #10b981;   /* Thymine — vert */
  --base-c: #f59e0b;   /* Cytosine — ambre */
  --base-g: #ef4444;   /* Guanine — rouge */
  --helix:  #818cf8;   /* violet helix */
  --text:   #8094b4;
  --text-hi:#e2e8f8;
  --muted:  #2d3a5a;
  --seq-bg: #090d1a;
}

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

body {
  font-family: 'Barlow', system-ui, sans-serif;
  background: var(--void);
  color: var(--text);
  line-height: 1.76;
  font-size: 1.01rem;
  overflow-x: hidden;
}

/* ── DNA SEQUENCE BACKGROUND ──────────────────── */
body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse 60% 30% at 0% 50%, rgba(59,130,246,.05) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 100% 20%, rgba(16,185,129,.05) 0%, transparent 60%),
    radial-gradient(ellipse 40% 50% at 50% 100%, rgba(245,158,11,.04) 0%, transparent 55%);
  pointer-events: none; z-index: 0;
}

/* ── PROGRESS BAR ─────────────────────────────── */
#progress-bar {
  position: fixed; top: 0; left: 0;
  height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--base-a), var(--base-t), var(--base-c), var(--base-g));
  z-index: 1000;
  transition: width .1s linear;
  box-shadow: 0 0 8px rgba(59,130,246,.5);
}

/* ── NAV ──────────────────────────────────────── */
nav {
  position: fixed; top: 3px; left: 0; right: 0; z-index: 900;
  background: rgba(7,9,15,.97);
  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: 'IBM Plex Mono', monospace;
  font-weight: 600; font-size: 1rem;
  color: var(--base-t); text-decoration: none;
  letter-spacing: .06em; margin-right: 24px; flex-shrink: 0;
  display: flex; align-items: center; gap: 6px;
}
.nav-brand .base-a { color: var(--base-a); }
.nav-brand .base-t { color: var(--base-t); }
.nav-brand .base-c { color: var(--base-c); }
.nav-brand .base-g { color: var(--base-g); }

nav a:not(.nav-brand) {
  font-family: 'IBM Plex Mono', monospace;
  font-size: .66rem; color: var(--muted);
  text-decoration: none; padding: 5px 10px;
  border-radius: 3px; 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(--base-t); background: rgba(16,185,129,.08);
}

/* ── HERO ─────────────────────────────────────── */
.hero {
  position: relative; padding: 112px 56px 76px;
  overflow: hidden; z-index: 1;
  border-bottom: 1px solid var(--border);
}
.hero-inner { max-width: 860px; position: relative; z-index: 2; }

/* Floating sequence strip */
.seq-strip {
  font-family: 'IBM Plex Mono', monospace;
  font-size: .72rem; letter-spacing: .12em;
  color: var(--muted); margin-bottom: 22px;
  overflow: hidden; white-space: nowrap;
  opacity: .8;
}
.seq-strip .sa { color: rgba(59,130,246,.7); }
.seq-strip .st { color: rgba(16,185,129,.7); }
.seq-strip .sc { color: rgba(245,158,11,.7); }
.seq-strip .sg { color: rgba(239,68,68,.7); }

.hero h1 {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 700; font-size: clamp(5rem, 12vw, 10rem);
  line-height: .88; color: var(--text-hi); margin-bottom: 20px;
  letter-spacing: -.01em;
}
.hero h1 .letter-a { color: var(--base-a); }
.hero h1 .letter-d { color: var(--text-hi); }
.hero h1 .letter-n { color: var(--base-t); }

.hero p.lead { font-size: 1.08rem; color: var(--text); max-width: 620px; line-height: 1.76; font-weight: 500; }

/* ── BASE PILLS ───────────────────────────────── */
.base-pills { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 28px; }
.base-pill {
  display: flex; align-items: center; gap: 8px;
  background: var(--card); border: 1px solid var(--border2);
  border-radius: 4px; padding: 10px 16px;
  font-family: 'IBM Plex Mono', monospace;
}
.base-pill .bl {
  font-size: 1.6rem; font-weight: 600; line-height: 1;
  width: 36px; height: 36px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: 'IBM Plex Mono', monospace;
}
.base-pill.ba .bl { background: rgba(59,130,246,.15); color: var(--base-a); }
.base-pill.bt .bl { background: rgba(16,185,129,.15); color: var(--base-t); }
.base-pill.bc .bl { background: rgba(245,158,11,.15);  color: var(--base-c); }
.base-pill.bg .bl { background: rgba(239,68,68,.15);   color: var(--base-g); }
.base-pill .bn { font-size: .72rem; color: var(--text); letter-spacing: .04em; }
.base-pill .bp { font-size: .66rem; color: var(--muted); letter-spacing: .02em; margin-top: 2px; }

/* ── STATS ────────────────────────────────────── */
.kpi-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.kpi {
  background: var(--card); border: 1px solid var(--border2);
  border-radius: 4px; padding: 12px 18px; flex: 1; min-width: 120px;
  border-left: 3px solid var(--base-a);
}
.kpi.t { border-left-color: var(--base-t); }
.kpi.c { border-left-color: var(--base-c); }
.kpi.g { border-left-color: var(--base-g); }
.kpi .kv {
  font-family: 'IBM Plex Mono', monospace; font-weight: 600;
  font-size: 1.6rem; color: var(--base-a); line-height: 1; display: block;
}
.kpi.t .kv { color: var(--base-t); }
.kpi.c .kv { color: var(--base-c); }
.kpi.g .kv { color: var(--base-g); }
.kpi .kl { font-size: .68rem; color: var(--muted); letter-spacing: .06em; text-transform: uppercase; margin-top: 4px; font-family: 'IBM Plex Mono', monospace; }

/* ── 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: 'IBM Plex Mono', monospace; font-size: .66rem; letter-spacing: .18em; text-transform: uppercase; color: var(--base-c); margin-bottom: 8px; }
.section h2 {
  font-family: 'Barlow Condensed', sans-serif; font-weight: 700;
  font-size: 2rem; color: var(--text-hi); letter-spacing: .02em;
  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: 56px; background: var(--base-t); }
.section h3 { font-family: 'Barlow Condensed', sans-serif; font-weight: 600; font-size: 1.15rem; color: var(--base-a); letter-spacing: .04em; text-transform: uppercase; margin: 24px 0 10px; }

/* ── CARDS ────────────────────────────────────── */
.card {
  background: var(--card); border: 1px solid var(--border2);
  border-radius: 4px; padding: 18px 22px; margin-bottom: 14px;
  transition: border-color .2s, transform .2s;
}
.card:hover { border-color: var(--base-t); transform: translateX(3px); }
.card.ca { border-left: 3px solid var(--base-a); }
.card.ct { border-left: 3px solid var(--base-t); }
.card.cc { border-left: 3px solid var(--base-c); }
.card.cg { border-left: 3px solid var(--base-g); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 12px; margin: 16px 0; }

/* ── CODE SEQUENCE ────────────────────────────── */
.seq-block {
  background: var(--seq-bg); border: 1px solid var(--border2);
  border-radius: 4px; padding: 16px 20px; margin: 14px 0;
  overflow-x: auto; font-family: 'IBM Plex Mono', monospace;
  font-size: .85rem; line-height: 2;
}
.seq-block .sa { color: var(--base-a); font-weight: 600; }
.seq-block .st { color: var(--base-t); font-weight: 600; }
.seq-block .sc { color: var(--base-c); font-weight: 600; }
.seq-block .sg { color: var(--base-g); font-weight: 600; }
.seq-block .comment { color: var(--muted); font-style: italic; }
.seq-block .codon-label { color: var(--helix); font-size: .78rem; }

/* ── BOX ──────────────────────────────────────── */
.box { border-radius: 4px; padding: 13px 17px; margin: 14px 0; border-left: 3px solid; font-size: .96rem; }
.box-a { background: rgba(59,130,246,.05); border-color: var(--base-a); }
.box-t { background: rgba(16,185,129,.05); border-color: var(--base-t); }
.box-c { background: rgba(245,158,11,.05); border-color: var(--base-c); }
.box-g { background: rgba(239,68,68,.05);  border-color: var(--base-g); }
.box-h { background: rgba(129,140,248,.05);border-color: var(--helix);  }

/* ── TAG ──────────────────────────────────────── */
.tag { display:inline-block; padding:2px 9px; border-radius:3px; font-family:'IBM Plex Mono',monospace; font-size:.65rem; letter-spacing:.06em; text-transform:uppercase; margin-bottom:8px; font-weight:600; }
.tag-a { background:rgba(59,130,246,.1);  color:var(--base-a); border:1px solid rgba(59,130,246,.25); }
.tag-t { background:rgba(16,185,129,.1);  color:var(--base-t); border:1px solid rgba(16,185,129,.25); }
.tag-c { background:rgba(245,158,11,.1);  color:var(--base-c); border:1px solid rgba(245,158,11,.25); }
.tag-g { background:rgba(239,68,68,.1);   color:var(--base-g); border:1px solid rgba(239,68,68,.25); }
.tag-h { background:rgba(129,140,248,.1); color:var(--helix);  border:1px solid rgba(129,140,248,.25);}

/* ── TABLE ────────────────────────────────────── */
table { width:100%; border-collapse:collapse; margin:12px 0; font-size:.91rem; }
th { background:var(--void3); color:var(--base-t); font-family:'IBM Plex Mono',monospace; font-size:.68rem; 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(16,185,129,.02); }
td code { font-family:'IBM Plex Mono',monospace; font-size:.87em; background:var(--void3); padding:1px 6px; border-radius:3px; }

/* ── REPAIR STEPS ─────────────────────────────── */
.step-row { display:flex; gap:0; margin:16px 0; overflow-x:auto; }
.step { flex:1; min-width:120px; text-align:center; padding:14px 10px; background:var(--card); border-top:2px solid var(--base-t); position:relative; }
.step:not(:last-child)::after { content:'→'; position:absolute; right:-10px; top:50%; transform:translateY(-50%); color:var(--base-t); font-size:1rem; z-index:1; font-family:'IBM Plex Mono',monospace; }
.step-num { font-family:'IBM Plex Mono',monospace; font-size:.72rem; color:var(--muted); display:block; margin-bottom:4px; }
.step-name { font-family:'Barlow Condensed',sans-serif; font-weight:600; font-size:.9rem; color:var(--text-hi); text-transform:uppercase; letter-spacing:.04em; }
.step-detail { font-size:.76rem; color:var(--text); margin-top:4px; line-height:1.4; }

/* ── 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(--base-a),var(--base-t)); }
.tl-item { position:relative; margin-bottom:20px; }
.tl-item::before { content:''; position:absolute; left:-35px; top:7px; width:8px; height:8px; background:var(--base-t); border-radius:50%; border:2px solid var(--void); box-shadow:0 0 5px var(--base-t); }
.tl-yr  { font-family:'IBM Plex Mono',monospace; font-size:.76rem; color:var(--base-c); font-weight:600; }
.tl-who { font-family:'Barlow Condensed',sans-serif; font-weight:700; color:var(--text-hi); font-size:1.05rem; letter-spacing:.02em; }
.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:4px; padding:16px 18px; margin-bottom:12px; }
.sb-card h3 { font-family:'IBM Plex Mono',monospace; font-weight:600; font-size:.8rem; color:var(--base-t); letter-spacing:.08em; 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:'IBM Plex 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(--base-t); background:rgba(16,185,129,.07); }

ul { padding-left:22px; } li { margin:5px 0; } ul li::marker { color:var(--base-t); }
strong { color:var(--text-hi); font-weight:600; }
code { font-family:'IBM Plex Mono',monospace; background:var(--void3); color:var(--base-a); padding:2px 7px; border-radius:3px; font-size:.87em; font-weight:600; }

#back-top { position:fixed; bottom:28px; right:28px; width:44px; height:44px; background:var(--base-t); color:var(--void); border:none; border-radius:3px; cursor:pointer; font-family:'IBM Plex Mono',monospace; font-weight:600; font-size:.9rem; 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:1px solid var(--border2); padding:24px 40px; text-align:center; color:var(--muted); font-family:'IBM Plex Mono',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; } }