:root{
  --bg:#fafafa;
  --fg:#1a1a1a;
  --muted:#6b6b6b;
  --accent:#4c6fe6;
  --accent-dark:#2849c2;
  --accent-light:#7f9cff;
  --brand:#0443ff;
  --accent-bg:#ecf1ff;
  --accent-bg-soft:#f7f9ff;
  --card:#ffffff;
  --border:#ececed;
  --primary:var(--accent);
  --red:#d64545;
  --sans:"Helvetica Neue",Inter,system-ui,-apple-system,"Segoe UI",sans-serif;
  --maxw:64rem;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:hidden}
body{font-family:var(--sans);background:var(--bg);color:var(--fg);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 1.5rem}

.blue{color:var(--accent)}
.eyebrow{font-family:var(--sans);font-size:.72rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--accent)}

h1{font-family:var(--sans);font-weight:800;font-size:clamp(2.5rem,6.5vw,4.1rem);line-height:1.04;letter-spacing:-.03em;color:var(--fg);overflow-wrap:break-word}
h2{font-family:var(--sans);font-weight:800;font-size:clamp(1.8rem,4vw,2.5rem);line-height:1.1;letter-spacing:-.025em;color:var(--fg);overflow-wrap:break-word}
h3{font-family:var(--sans);font-weight:700;font-size:1.3rem;line-height:1.25;letter-spacing:-.015em}
h1 em,h2 em{font-style:normal;background:linear-gradient(125deg,var(--accent) 0%,var(--accent-dark) 75%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:var(--accent)}
p{color:#2a2a2a}
.muted{color:var(--muted)}
strong,b{font-weight:700;color:var(--fg)}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:.45rem;font-family:var(--sans);font-size:.92rem;font-weight:600;padding:.82rem 1.8rem;border-radius:9999px;transition:opacity .15s,transform .15s,background .15s;cursor:pointer;border:1px solid transparent}
.btn-primary{background:linear-gradient(125deg,var(--accent) 0%,var(--accent-dark) 100%);color:#fff}
.btn-primary:hover{opacity:.92;transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--accent);border:1.5px solid var(--accent)}
.btn-ghost:hover{background:var(--accent-bg)}

/* header */
header{position:sticky;top:0;z-index:40;border-bottom:1px solid var(--border);background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:blur(10px)}
.hrow{display:flex;align-items:center;justify-content:space-between;padding:1rem 0;gap:1rem}
.brand{font-family:var(--sans);font-weight:800;font-size:1.15rem;letter-spacing:-.02em;color:var(--fg);flex:none}
.brand b{color:var(--brand);font-weight:800}
nav.main{display:none;align-items:center;gap:1.35rem;font-size:.82rem;color:var(--muted)}
nav.main a{transition:color .15s;white-space:nowrap}
nav.main a:hover{color:var(--fg)}
nav.main a.ext{color:var(--accent);font-weight:600}
@media(min-width:1040px){nav.main{display:flex}}

/* hero */
.hero{text-align:center;padding:5.5rem 1.5rem 3.5rem;border-bottom:1px solid var(--border);background:linear-gradient(160deg,var(--accent-bg-soft) 0%,#ffffff 55%,var(--accent-bg) 100%)}
.hero .eyebrow{display:block;margin-bottom:1.5rem}
.hero h1{max-width:18ch;margin:0 auto 1.4rem}
.hero .sub{font-size:1.12rem;color:var(--muted);max-width:50ch;margin:0 auto}

/* sections */
section.block{padding:4.5rem 0;border-bottom:1px solid var(--border)}
.head{margin-bottom:2rem}
.head .eyebrow{display:block;margin-bottom:1rem}
.prose{max-width:46rem}
.prose p{font-size:1.06rem;margin-bottom:1.2rem}
.prose h2{margin:2.6rem 0 1.1rem}
.prose h2:first-child{margin-top:0}
.prose h3{margin:2rem 0 .8rem;color:var(--fg)}
.lede{font-size:1.14rem;color:#2a2a2a;max-width:46rem;line-height:1.6}

/* alignement cohérent */
section.block>.wrap>.head,
section.block>.wrap>.prose,
section.block>.wrap>.note,
section.block>.wrap>.ctablock,
section.block>.wrap>.quote,
section.block>.wrap>.steps,
section.block>.wrap>.tbl,
section.block>.wrap>.avoid,
section.block>.wrap>.figure,
section.block>.wrap>p{max-width:46rem;margin-left:auto;margin-right:auto}
section.block>.wrap>.guidemap,
section.block>.wrap>.figure.wide,
section.block>.wrap>.metrics{max-width:60rem;margin-left:auto;margin-right:auto}

/* arrow / plain / avoid lists */
.alist{list-style:none;display:grid;gap:.85rem;margin:1.3rem 0}
.alist li{position:relative;padding-left:1.9rem;font-size:1.04rem;color:#2a2a2a}
.alist li::before{content:"→";position:absolute;left:0;top:0;color:var(--accent);font-weight:700}
.plist{list-style:none;display:grid;gap:.85rem;margin:1.3rem 0}
.plist li{position:relative;padding-left:1.4rem;font-size:1.04rem;color:#2a2a2a}
.plist li::before{content:"";position:absolute;left:0;top:.55em;width:.5rem;height:.5rem;background:var(--accent);border-radius:50%}
.avoid{list-style:none;display:grid;gap:.85rem;margin:1.3rem 0}
.avoid li{position:relative;padding-left:1.6rem;color:#2a2a2a;font-size:1.04rem}
.avoid li::before{content:"";position:absolute;left:0;top:.58em;width:.75rem;height:.14rem;background:var(--red);border-radius:2px}

/* numbered steps */
.steps{counter-reset:s;list-style:none;display:grid;gap:1.1rem;margin:1.6rem 0}
.steps li{position:relative;padding-left:3rem;font-size:1.05rem;color:#2a2a2a}
.steps li::before{counter-increment:s;content:counter(s);position:absolute;left:0;top:-.1rem;font-weight:800;font-size:1.5rem;color:var(--accent);line-height:1}

/* note */
.note{border:1px solid var(--border);border-left:3px solid var(--accent);background:var(--accent-bg-soft);border-radius:0 10px 10px 0;padding:1.2rem 1.4rem;margin:1.7rem 0}
.note .lbl{display:block;font-size:.64rem;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);font-weight:700;margin-bottom:.5rem}
.note p{margin:0;color:#3a3a3a;font-size:1rem}

/* quote */
.quote{max-width:42rem;border:1px solid var(--accent-bg);border-radius:14px;background:var(--accent-bg-soft);padding:2rem;text-align:center}
.quote .q{font-weight:700;font-size:1.4rem;line-height:1.3;letter-spacing:-.02em;color:var(--fg)}
.quote .sub{font-size:.95rem;color:var(--muted);margin-top:.9rem}

/* guide map (vertical) */
.guidemap{margin:1.8rem auto;border:1px solid var(--border);border-radius:14px;background:var(--card);overflow:hidden}
.gcard{display:flex;align-items:center;gap:1.2rem;padding:1.3rem 1.5rem;transition:background .15s}
.gcard+.gcard{border-top:1px solid var(--border)}
.gcard:hover{background:var(--accent-bg-soft)}
.gcard .gn{font-weight:800;font-size:1.4rem;color:var(--accent);flex:none;width:2.6rem}
.gcard .gbody{flex:1;min-width:0}
.gcard h3{font-size:1.2rem;margin:0 0 .2rem}
.gcard p{font-size:.92rem;color:var(--muted);margin:0}
.gcard .go{font-size:.85rem;color:var(--accent);font-weight:700;flex:none;white-space:nowrap}
@media(max-width:560px){.gcard{flex-wrap:wrap}.gcard .go{width:100%;padding-left:3.8rem}}

/* tables */
.tbl{width:100%;border-collapse:collapse;font-size:.96rem;margin:1.4rem 0;border:1px solid var(--border);border-radius:12px;overflow:hidden;background:var(--card)}
.tbl th{text-align:left;font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);font-weight:700;padding:.8rem 1.1rem;background:var(--accent-bg-soft);border-bottom:1px solid var(--border)}
.tbl td{padding:.85rem 1.1rem;border-bottom:1px solid var(--border);vertical-align:top;color:#2a2a2a}
.tbl tr:last-child td{border-bottom:none}
.tbl td:first-child{white-space:nowrap;font-weight:600;color:var(--fg)}

/* figures (visuels SVG) */
.figure{margin:2.2rem auto;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:1.6rem 1.4rem}
.figure svg{width:100%;height:auto;display:block;overflow:visible}
.figcap{text-align:center;font-size:.82rem;color:var(--muted);margin-top:1rem}
.figure-bare{margin:2.2rem auto;max-width:46rem}
.figure-bare svg{width:100%;height:auto;display:block}

/* CTA */
.ctablock{text-align:center;padding:2.4rem 1.6rem;margin:2.6rem auto;border-radius:16px;background:linear-gradient(135deg,var(--accent) 0%,var(--accent-dark) 100%);color:#fff}
.ctablock h3{margin-bottom:.7rem;color:#fff;font-size:1.5rem}
.ctablock p{color:rgba(255,255,255,.92);max-width:40rem;margin:0 auto 1.4rem}
.ctablock .btn-primary{background:#fff;color:var(--accent-dark)}
.ctablock .btn-primary:hover{opacity:.95}

.final{text-align:center;padding:5.5rem 1.5rem;border-top:1px solid var(--border);background:linear-gradient(160deg,#ffffff 0%,var(--accent-bg) 100%)}
.final .eyebrow{display:block;margin-bottom:1.2rem}
.final h2{max-width:20ch;margin:0 auto 1.1rem}
.final p{color:var(--muted);max-width:42ch;margin:0 auto 2rem;font-size:1.06rem}
.final .actions{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap}

/* backlink + footer */
.backlink{display:inline-flex;align-items:center;gap:.4rem;font-size:.9rem;color:var(--accent);font-weight:600;margin-top:1.4rem}
footer{border-top:1px solid var(--border);padding:2.2rem 0}
.frow{display:flex;flex-direction:column;gap:.8rem;justify-content:space-between;align-items:flex-start}
@media(min-width:768px){.frow{flex-direction:row;align-items:center}}
footer .brand{font-size:1rem}
footer .meta{font-size:.82rem;color:var(--muted)}
footer .meta a{color:var(--accent)}