/* chatbot-gpt.fr — le mode d'emploi de Chatbot GPT (néo-brutaliste, jaune & noir, accents bleus) */
:root {
  --ink: #111111;
  --ink-soft: #3d3d3d;
  --bg: #fffdf4;
  --bg-alt: #fff4c2;
  --paper: #ffffff;
  --yellow: #ffd23f;
  --blue: #2f4bff;
  --blue-dark: #1f33c4;
  --pink: #ff7aa2;
  --green: #2ec27e;
  --line: 3px solid var(--ink);
  --shadow: 6px 6px 0 var(--ink);
  --shadow-sm: 4px 4px 0 var(--ink);
  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --max: 1180px;
  color-scheme: light;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; font-size: 17px; line-height: 1.6; color: var(--ink); background: var(--bg); -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); font-weight: 600; text-decoration-thickness: 2px; text-underline-offset: 3px; }
a:hover { color: var(--ink); background: var(--yellow); }
h1, h2, h3 { line-height: 1.08; margin: 0 0 .55em; letter-spacing: -.025em; font-weight: 900; }
h1 { font-size: clamp(2.3rem, 5.6vw, 4.1rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); }
h3 { font-size: 1.18rem; letter-spacing: -.01em; }
p { margin: 0 0 1em; }
code, .mono { font-family: var(--mono); }
.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; background: var(--yellow); border: var(--line); padding: 8px 12px; z-index: 10; }
mark { background: var(--yellow); padding: 0 .15em; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 5; background: var(--bg); border-bottom: var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px 20px; min-height: 70px; flex-wrap: wrap; padding-top: 8px; padding-bottom: 8px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 900; font-size: 1.22rem; color: var(--ink); text-decoration: none; letter-spacing: -.02em; }
.logo:hover { background: none; color: var(--ink); }
.logo .dash { color: var(--blue); }
.logo .tld { background: var(--yellow); border: 2px solid var(--ink); padding: 0 5px; margin-left: 3px; font-size: .9em; }
.nav { display: flex; gap: 6px 18px; flex-wrap: wrap; align-items: center; }
.nav a { color: var(--ink); text-decoration: none; font-weight: 700; font-size: .93rem; padding: 2px 0; }
.nav a:hover { background: var(--yellow); }
.nav a[aria-current="page"] { box-shadow: inset 0 -4px 0 var(--yellow); }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border: var(--line); font-weight: 800; text-decoration: none; transition: transform .12s, box-shadow .12s; box-shadow: var(--shadow-sm); }
.btn:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--ink); }
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.btn-primary { background: var(--yellow); color: var(--ink) !important; }
.btn-primary:hover { background: var(--yellow); }
.btn-ghost { background: var(--paper); color: var(--ink); }
.btn-ghost:hover { background: var(--paper); }
.btn-blue { background: var(--blue); color: #fff !important; }
.btn-blue:hover { background: var(--blue); }
.nav .btn { padding: 8px 14px; font-size: .9rem; box-shadow: 3px 3px 0 var(--ink); }

/* Sections */
section { padding: 76px 0; }
section.alt { background: var(--bg-alt); border-top: var(--line); border-bottom: var(--line); }
section.dark { background: var(--ink); color: #fff; }
section.dark h2, section.dark h3 { color: #fff; }
section.dark p { color: #d6d6d6; }
.kicker { display: inline-block; font-family: var(--mono); font-size: .8rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; background: var(--ink); color: var(--yellow); padding: 4px 10px; margin-bottom: 18px; }
.dark .kicker { background: var(--yellow); color: var(--ink); }
.section-head { max-width: 760px; margin-bottom: 40px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head p { color: var(--ink-soft); font-size: 1.08rem; }
.lead { font-size: 1.2rem; color: var(--ink-soft); max-width: 640px; }

/* Hero */
.hero { padding: 64px 0 90px; border-bottom: var(--line); background-image: linear-gradient(rgba(17,17,17,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(17,17,17,.05) 1px, transparent 1px); background-size: 32px 32px; }
.hero .wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.hero h1 .hl { background: var(--yellow); box-shadow: 0 0 0 3px var(--yellow); }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin: 28px 0 0; }
.hero img { border: var(--line); box-shadow: var(--shadow); background: var(--paper); }

/* Stats strip */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border: var(--line); background: var(--paper); box-shadow: var(--shadow); margin-top: -40px; position: relative; }
.stats div { padding: 18px 20px; border-right: var(--line); }
.stats div:last-child { border-right: 0; }
.stats b { display: block; font-size: 1.9rem; font-weight: 900; letter-spacing: -.03em; line-height: 1.1; }
.stats span { font-family: var(--mono); font-size: .82rem; color: var(--ink-soft); }
.stats-wrap { padding: 0 0 20px; }

/* Grids & cards */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card { background: var(--paper); border: var(--line); box-shadow: var(--shadow-sm); padding: 24px; }
.card p { color: var(--ink-soft); margin: 0; }
.tile .num { font-family: var(--mono); font-weight: 700; font-size: .85rem; display: inline-block; border: 2px solid var(--ink); padding: 1px 8px; margin-bottom: 14px; background: var(--yellow); }
.tile:nth-child(3n+2) .num { background: var(--pink); }
.tile:nth-child(3n) .num { background: #b9c4ff; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }

/* Before / after */
.ba { display: grid; grid-template-columns: 1fr auto 1fr; gap: 0; border: var(--line); box-shadow: var(--shadow); background: var(--paper); }
.ba > div { padding: 22px 24px; }
.ba .before { background: #f1f1f1; }
.ba .before p { color: #555; }
.ba .after { background: #eafff3; }
.ba .label { font-family: var(--mono); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; display: inline-block; padding: 2px 8px; border: 2px solid var(--ink); margin-bottom: 12px; background: var(--paper); }
.ba .after .label { background: var(--green); color: var(--ink); }
.ba .arrow { display: flex; align-items: center; justify-content: center; border-left: var(--line); border-right: var(--line); background: var(--yellow); font-weight: 900; font-size: 1.6rem; padding: 0 14px; }
.ba p { margin: 0 0 .7em; }
.ba p:last-child { margin: 0; }
.ask { font-family: var(--mono); font-size: .9rem; background: var(--ink); color: var(--yellow); padding: 12px 16px; border: var(--line); border-bottom: 0; }
.ask::before { content: "› "; color: #fff; }
.example + .example { margin-top: 56px; }
.example h2 { font-size: clamp(1.35rem, 2.4vw, 1.75rem); }

/* Prompt box */
.prompt { font-family: var(--mono); font-size: .92rem; background: var(--ink); color: #f5f5f5; border: var(--line); box-shadow: var(--shadow-sm); padding: 14px 18px; margin: 14px 0 0; white-space: pre-wrap; word-break: break-word; }
.prompt::before { content: "› "; color: var(--yellow); font-weight: 700; }

/* Lessons */
.toc { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 40px; padding: 0; list-style: none; }
.toc a { display: inline-block; font-family: var(--mono); font-size: .85rem; font-weight: 700; color: var(--ink); text-decoration: none; border: 2px solid var(--ink); background: var(--paper); padding: 6px 12px; box-shadow: 3px 3px 0 var(--ink); }
.toc a:hover { background: var(--yellow); }
.lesson { display: grid; grid-template-columns: 110px 1fr; border: var(--line); box-shadow: var(--shadow); background: var(--paper); margin-bottom: 32px; scroll-margin-top: 100px; }
.lesson .day { border-right: var(--line); background: var(--yellow); display: flex; flex-direction: column; align-items: center; justify-content: flex-start; padding: 22px 8px; }
.lesson:nth-of-type(even) .day { background: #b9c4ff; }
.lesson .day span { font-family: var(--mono); font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; }
.lesson .day b { font-size: 3rem; font-weight: 900; line-height: 1; }
.lesson .body { padding: 26px 28px; }
.lesson .goal { font-family: var(--mono); font-size: .86rem; color: var(--blue-dark); font-weight: 700; margin-bottom: 10px; }
.lesson h2 { font-size: clamp(1.35rem, 2.6vw, 1.8rem); }
.lesson .exo { margin-top: 18px; padding-top: 16px; border-top: 2px dashed var(--ink); }
.lesson .exo strong { font-family: var(--mono); font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; }

/* Features */
.feature { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border: var(--line); box-shadow: var(--shadow-sm); background: var(--paper); margin-bottom: 26px; scroll-margin-top: 100px; }
.feature .main { padding: 24px 26px; border-right: var(--line); }
.feature .side { padding: 24px 26px; background: #fafafa; }
.feature dl { margin: 0; }
.feature dt { font-family: var(--mono); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; margin-top: 14px; }
.feature dt:first-child { margin-top: 0; }
.feature dd { margin: 4px 0 0; color: var(--ink-soft); }
.feature h2 { font-size: clamp(1.3rem, 2.4vw, 1.7rem); }

/* Myths */
.myth { border: 3px solid #fff; padding: 22px; background: #1d1d1d; }
.myth .tag { font-family: var(--mono); font-size: .75rem; font-weight: 700; padding: 2px 8px; display: inline-block; margin-bottom: 10px; background: var(--pink); color: var(--ink); }
.myth h3 { text-decoration: line-through; text-decoration-color: var(--pink); text-decoration-thickness: 3px; }
.myth p strong { color: var(--yellow); }

/* Table */
.table-wrap { overflow-x: auto; border: var(--line); box-shadow: var(--shadow-sm); background: var(--paper); margin: 30px 0; }
table { width: 100%; border-collapse: collapse; min-width: 560px; }
th, td { text-align: left; padding: 13px 16px; border-bottom: 2px solid var(--ink); vertical-align: top; }
thead th { background: var(--ink); color: var(--yellow); font-family: var(--mono); font-size: .82rem; text-transform: uppercase; letter-spacing: .06em; }
tbody tr:last-child td { border-bottom: 0; }
tbody td:first-child { font-weight: 800; }

/* FAQ */
.faq details { background: var(--paper); border: var(--line); margin-bottom: 14px; box-shadow: var(--shadow-sm); }
.faq summary { cursor: pointer; font-weight: 800; padding: 16px 52px 16px 20px; list-style: none; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 16px; top: 50%; transform: translateY(-50%); width: 26px; height: 26px; border: 2px solid var(--ink); background: var(--yellow); display: grid; place-items: center; font-family: var(--mono); font-weight: 700; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details[open] summary { border-bottom: 2px solid var(--ink); }
.faq details p { padding: 14px 20px 18px; margin: 0; color: var(--ink-soft); }

/* CTA */
.cta { background: var(--blue); color: #fff; border: var(--line); box-shadow: 10px 10px 0 var(--ink); padding: 52px 40px; text-align: center; }
.cta h2 { color: #fff; }
.cta p { color: #e3e7ff; font-size: 1.1rem; max-width: 620px; margin: 0 auto 26px; }

/* Inner pages */
.page-hero { padding: 54px 0 46px; border-bottom: var(--line); background-color: var(--bg-alt); background-image: radial-gradient(rgba(17,17,17,.13) 1.2px, transparent 1.2px); background-size: 18px 18px; }
.page-hero .lead { margin-bottom: 0; }
.breadcrumb { font-family: var(--mono); font-size: .84rem; margin-bottom: 18px; }
.breadcrumb a { color: var(--ink); }
.prose { max-width: 780px; }
.prose h2 { font-size: clamp(1.4rem, 2.6vw, 1.9rem); margin-top: 1.6em; }
.note { border: var(--line); background: var(--yellow); padding: 18px 22px; box-shadow: var(--shadow-sm); }
.disclaimer { font-family: var(--mono); font-size: .8rem; color: var(--ink-soft); margin-top: 22px; }

/* Footer */
.site-footer { background: var(--ink); color: #cfcfcf; padding: 56px 0 30px; border-top: 6px solid var(--yellow); }
.site-footer .logo { color: #fff; }
.site-footer .logo .tld { color: var(--ink); }
.site-footer a { color: #fff; font-weight: 500; }
.site-footer a:hover { color: var(--ink); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 36px; }
.site-footer h4 { font-family: var(--mono); color: var(--yellow); font-size: .8rem; text-transform: uppercase; letter-spacing: .1em; margin: 0 0 14px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 8px; }
.footer-disclaimer { margin: 36px 0 0; padding-top: 22px; border-top: 1px solid #333; font-size: .88rem; }
.footer-bottom { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-family: var(--mono); font-size: .8rem; margin-top: 14px; color: #9a9a9a; }

/* Responsive */
@media (max-width: 960px) {
  .hero .wrap, .split { grid-template-columns: 1fr; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats div:nth-child(2) { border-right: 0; }
  .stats div:nth-child(-n+2) { border-bottom: var(--line); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > div:first-child { grid-column: 1 / -1; }
  .feature { grid-template-columns: 1fr; }
  .feature .main { border-right: 0; border-bottom: var(--line); }
}
@media (max-width: 640px) {
  section { padding: 56px 0; }
  .wrap { padding: 0 16px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .ba { grid-template-columns: 1fr; }
  .ba .arrow { border: 0; border-top: var(--line); border-bottom: var(--line); padding: 4px; }
  .ba .arrow span { transform: rotate(90deg); }
  .lesson { grid-template-columns: 1fr; }
  .lesson .day { border-right: 0; border-bottom: var(--line); flex-direction: row; gap: 12px; padding: 12px 18px; justify-content: flex-start; }
  .lesson .day b { font-size: 2rem; }
  .lesson .body { padding: 22px 18px; }
  .cta { padding: 38px 20px; box-shadow: 6px 6px 0 var(--ink); }
  .footer-grid { grid-template-columns: 1fr; }
  .nav { gap: 4px 14px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .btn { transition: none; } }
.ba .arrow span { display: inline-block; }