:root {
  --paper: #f5f6fa;
  --surface: #ffffff;
  --ink: #14213d;
  --mute: #55607a;
  --line: #dde2ed;
  --link: #1d4fb8;
  --gold: #f2b705;
  --gold-ink: #2a2000;
  --leaf: #1a9e5a;
  --clay: #d4432e;
  --night: #0f1830;
  --night-ink: #e6ebf5;
  --code-inline: #e9edf6;
  --display: "Bricolage Grotesque", "Atkinson Hyperlegible", system-ui, sans-serif;
  --text: "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  --gutter: clamp(16px, 4vw, 40px);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0c1324; --surface: #131c33; --ink: #e9edf7; --mute: #9aa5bf; --line: #26314d; --link: #93b4ff; --code-inline: #1c2742; --night: #080e1d; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0c1324; --surface: #131c33; --ink: #e9edf7; --mute: #9aa5bf; --line: #26314d; --link: #93b4ff; --code-inline: #1c2742; --night: #080e1d; color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 84px; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 18px/1.6 var(--text); }
img, svg { display: block; }
a { color: var(--link); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3 { font-family: var(--display); line-height: 1.1; letter-spacing: -0.015em; margin: 0; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--gold); color: var(--gold-ink); padding: 8px 14px; border-radius: 8px; z-index: 10; }
.skip:focus { left: 8px; }

.top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 16px; padding: 12px var(--gutter); background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font: 800 19px/1 var(--display); margin-right: auto; }
.logo-mark { width: 28px; height: 28px; flex: none; }
.nav { display: flex; gap: 4px; }
.nav a { color: var(--ink); text-decoration: none; font-weight: 700; font-size: 16px; padding: 8px 12px; border-radius: 999px; }
.nav a:hover { background: var(--surface); }
.nav a[aria-current="page"] { background: var(--ink); color: var(--paper); }
.theme { width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--line); background: var(--surface); color: var(--ink); display: grid; place-items: center; cursor: pointer; flex: none; }
.theme svg { width: 18px; height: 18px; fill: currentColor; }
@media (max-width: 560px) { .brand span { display: none; } .nav a { padding: 8px 10px; font-size: 15px; } }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 12px 22px; border-radius: 14px; font: 700 17px/1.2 var(--text); text-decoration: none; text-align: center; cursor: pointer; border: 0; }
.btn-gold { background: var(--gold); color: var(--gold-ink); }
.btn-gold:hover { background: #ffc61a; }
.btn-line { background: transparent; color: var(--ink); border: 2px solid var(--ink); }
.btn-line:hover { background: var(--ink); color: var(--paper); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* Accueil */
.hero { display: grid; gap: clamp(32px, 5vw, 64px); align-items: center; max-width: 1240px; margin: 0 auto; padding: clamp(40px, 8vw, 96px) var(--gutter) clamp(48px, 7vw, 88px); }
@media (min-width: 980px) { .hero { grid-template-columns: 1.05fr 1fr; } }
.hero h1 { font-size: clamp(2.5rem, 6.4vw, 4.6rem); font-weight: 800; line-height: 0.98; letter-spacing: -0.03em; max-width: 12ch; }
.lead { font-size: clamp(1.1rem, 2vw, 1.3rem); color: var(--mute); max-width: 36em; margin: 22px 0 30px; }
.lead strong { color: var(--ink); }
.progress-line { margin: 18px 0 0; color: var(--mute); font-size: 16px; }

.terminal { margin: 0; background: var(--night); color: var(--night-ink); border-radius: 20px; overflow: hidden; box-shadow: 0 30px 60px -30px rgba(10, 20, 50, .55); }
.term-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; background: rgba(255, 255, 255, .05); font: 13px/1 var(--text); color: #9aa5bf; }
.term-bar i { width: 11px; height: 11px; border-radius: 50%; background: #3a4566; }
.term-bar i:nth-child(1) { background: #1a9e5a; } .term-bar i:nth-child(2) { background: #f2b705; } .term-bar i:nth-child(3) { background: #d4432e; }
.term-bar span { margin-left: 8px; }
.term { margin: 0; padding: 20px 20px 8px; font: 15px/1.65 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; min-height: 16.5em; }
.t-prompt { color: #f2b705; }
.t-ai { color: #3fd08a; }
.t-answer { display: block; margin-top: 6px; color: #ffffff; }
.terminal figcaption { display: flex; align-items: center; gap: 10px; padding: 12px 20px 18px; font-size: 14px; color: #9aa5bf; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: #3fd08a; box-shadow: 0 0 0 4px rgba(63, 208, 138, .18); }
.js .t-line { opacity: 0; transition: opacity .35s ease; }
.js .t-line.is-on { opacity: 1; }
.caret::after { content: ""; display: inline-block; width: .55em; height: 1.1em; margin-left: 2px; vertical-align: -3px; background: #f2b705; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .js .t-line { opacity: 1; transition: none; } .caret::after { animation: none; } }

.section-head { max-width: 1240px; margin: 0 auto 32px; padding: 0 var(--gutter); }
.section-head h2, .ollama h2, .pro h2, .ensemble h2 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); }
.section-head p { color: var(--mute); max-width: 40em; margin: 12px 0 0; }
.parcours { padding: clamp(40px, 6vw, 72px) 0; border-top: 1px solid var(--line); }
.phases { list-style: none; margin: 0 auto; padding: 0 var(--gutter); max-width: 1240px; display: grid; gap: 8px; }
.phase { display: grid; gap: 10px; padding: 18px 0; border-top: 1px solid var(--line); }
.phase:first-child { border-top: 0; }
@media (min-width: 860px) { .phase { grid-template-columns: 240px 1fr; gap: 32px; } }
.phase-name { font-size: 1.25rem; color: var(--mute); padding-top: 14px; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; }
.step a { position: relative; display: grid; grid-template-columns: 48px 1fr auto; gap: 16px; align-items: start; padding: 14px 0; color: var(--ink); text-decoration: none; }
.step + .step a::before { content: ""; position: absolute; left: 23px; top: -14px; height: 28px; width: 2px; background: var(--line); }
.step-num { width: 48px; height: 48px; border-radius: 50%; display: grid; place-items: center; font: 800 20px/1 var(--display); background: var(--surface); border: 2px solid var(--line); position: relative; z-index: 1; }
.step-text { display: grid; gap: 4px; }
.step-text strong { font: 700 1.2rem/1.25 var(--display); }
.step-text span { color: var(--mute); font-size: 16px; line-height: 1.5; }
.step-time { color: var(--mute); font-size: 15px; white-space: nowrap; padding-top: 4px; }
.step a:hover strong { text-decoration: underline; text-underline-offset: 4px; }
.step a:hover .step-num { border-color: var(--ink); }
.step.is-done .step-num { background: var(--leaf); border-color: var(--leaf); color: #fff; }
@media (max-width: 600px) { .step a { grid-template-columns: 44px 1fr; } .step-num { width: 44px; height: 44px; font-size: 18px; } .step + .step a::before { left: 21px; } .step-time { grid-column: 2; padding: 0; font-size: 14px; } }

.ollama { background: var(--night); color: var(--night-ink); }
.ollama-in { max-width: 860px; margin: 0 auto; padding: clamp(48px, 7vw, 84px) var(--gutter); }
.ollama p { color: #b9c3da; max-width: 40em; }
.ollama a { color: #ffd34d; }
.small { font-size: 16px; }

.pro { max-width: 1240px; margin: clamp(48px, 7vw, 80px) auto; padding: 32px var(--gutter); display: grid; gap: 24px; align-items: center; }
.pro > div { border-left: 6px solid var(--gold); padding-left: 22px; }
.pro p { color: var(--mute); max-width: 40em; margin: 12px 0 0; }
@media (min-width: 900px) { .pro { grid-template-columns: 1fr auto; } }

.ensemble { max-width: 1240px; margin: 0 auto; padding: 0 var(--gutter) clamp(56px, 8vw, 96px); }
.ensemble-grid { display: grid; gap: 14px; margin-top: 24px; }
@media (min-width: 820px) { .ensemble-grid { grid-template-columns: repeat(3, 1fr); } }
.link-card { display: grid; gap: 6px; padding: 22px; border-radius: 16px; background: var(--surface); border: 1px solid var(--line); color: var(--ink); text-decoration: none; }
.link-card strong { font: 700 1.15rem/1.25 var(--display); }
.link-card span { color: var(--mute); font-size: 16px; }
.link-card:hover { border-color: var(--ink); }

/* Code */
.code { position: relative; margin: 20px 0; }
.code pre { margin: 0; padding: 18px 20px; padding-right: 92px; background: var(--night); color: var(--night-ink); border-radius: 14px; overflow-x: auto; white-space: pre-wrap; overflow-wrap: anywhere; font: 15px/1.6 var(--mono); }
.copy { position: absolute; top: 10px; right: 10px; min-height: 34px; padding: 6px 12px; border-radius: 8px; border: 1px solid rgba(255, 255, 255, .2); background: rgba(255, 255, 255, .08); color: #e6ebf5; font: 700 14px/1 var(--text); cursor: pointer; }
.copy:hover { background: rgba(255, 255, 255, .16); }
.code-hero pre { font-size: 17px; padding: 22px; padding-right: 100px; background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .12); }

/* Leçon */
.lesson-wrap { max-width: 1240px; margin: 0 auto; padding: clamp(28px, 5vw, 56px) var(--gutter) 72px; display: grid; gap: 48px; }
@media (min-width: 1040px) { .lesson-wrap { grid-template-columns: 250px minmax(0, 1fr); } }
.side { display: none; }
@media (min-width: 1040px) { .side { display: block; position: sticky; top: 92px; align-self: start; max-height: calc(100vh - 110px); overflow: auto; } }
.side-title { font-weight: 700; margin: 0 0 10px; color: var(--mute); font-size: 15px; }
.side-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.side-list a { display: flex; gap: 10px; align-items: baseline; padding: 8px 10px; border-radius: 10px; color: var(--ink); text-decoration: none; font-size: 15px; line-height: 1.35; }
.side-list a:hover { background: var(--surface); }
.side-list a[aria-current="page"] { background: var(--ink); color: var(--paper); }
.side-num { font: 800 14px/1 var(--display); min-width: 18px; color: var(--mute); }
.side-list a[aria-current="page"] .side-num { color: var(--gold); }
.side-list li.is-done .side-num { color: var(--leaf); }

.lesson { max-width: 46rem; min-width: 0; }
.lesson-meta { margin: 0 0 12px; color: var(--mute); font-size: 16px; }
.lesson-head h1 { font-size: clamp(2.2rem, 5vw, 3.3rem); font-weight: 800; letter-spacing: -0.025em; }
.lesson-goal { font-size: 1.2rem; margin: 18px 0 0; padding-left: 18px; border-left: 4px solid var(--gold); }
.toc { margin: 26px 0 0; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.toc summary { padding: 14px 18px; font-weight: 700; cursor: pointer; }
.toc ol { margin: 0; padding: 0 18px 16px 40px; display: grid; gap: 4px; font-size: 16px; }

.prose { margin-top: 36px; }
.prose h2 { font-size: clamp(1.5rem, 3vw, 1.9rem); margin: 52px 0 14px; padding-top: 22px; border-top: 1px solid var(--line); }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 1.25rem; margin: 32px 0 10px; }
.prose p, .prose li { max-width: 40em; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: 6px 0; }
.prose li::marker { color: var(--mute); }
.prose strong { font-weight: 700; }
.prose :not(pre) > code { font: 0.86em var(--mono); background: var(--code-inline); padding: 2px 6px; border-radius: 6px; overflow-wrap: anywhere; }
.prose ul:has(input[type="checkbox"]) { list-style: none; padding-left: 0; }
.prose input[type="checkbox"] { width: 18px; height: 18px; margin: 0 10px 0 0; vertical-align: -3px; accent-color: var(--leaf); }
.prose h2[id^="exercice"] { border-top: 0; margin-top: 56px; padding: 22px 24px 0; background: var(--surface); border-radius: 16px 16px 0 0; border: 1px solid var(--line); border-bottom: 0; }
.prose h2[id^="exercice"] + ol { margin-top: 0; padding: 4px 24px 22px 46px; background: var(--surface); border: 1px solid var(--line); border-top: 0; border-radius: 0 0 16px 16px; }
.prose h2[id^="ne-fais-jamais"], .prose h2[id^="erreurs-frequentes"] { color: var(--clay); }

.table { overflow-x: auto; margin: 20px 0; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.table table { border-collapse: collapse; width: 100%; font-size: 16px; }
.table th, .table td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.table tr:last-child td { border-bottom: 0; }
.table th { font-weight: 700; background: color-mix(in srgb, var(--line) 35%, transparent); }

.done-box { margin: 56px 0 0; padding: 24px; border-radius: 16px; border: 2px dashed var(--line); display: grid; gap: 10px; justify-items: start; }
.done-box p { margin: 0; color: var(--mute); font-size: 16px; }
.btn-done { background: var(--surface); color: var(--ink); border: 2px solid var(--ink); }
.btn-done[aria-pressed="true"] { background: var(--leaf); border-color: var(--leaf); color: #fff; }

.pager { display: grid; gap: 12px; margin-top: 28px; }
@media (min-width: 640px) { .pager { grid-template-columns: 1fr 1fr; } }
.pager a { display: grid; gap: 4px; padding: 18px 20px; border-radius: 14px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); text-decoration: none; font: 700 1.05rem/1.3 var(--display); }
.pager a span { font: 400 15px/1 var(--text); color: var(--mute); }
.pager a:hover { border-color: var(--ink); }
.pager-next { text-align: right; }

/* Entreprises */
.ent { max-width: 1240px; margin: 0 auto; padding: clamp(40px, 7vw, 88px) var(--gutter) 72px; }
.ent-head h1 { font-size: clamp(2.4rem, 6vw, 4.2rem); font-weight: 800; letter-spacing: -0.03em; max-width: 14ch; margin-bottom: 28px; }
.prose-ent { max-width: 46rem; margin-top: 48px; }
.prose-ent > p:first-child { font-size: 1.25rem; }
.ent-cta { max-width: 46rem; margin-top: 56px; padding: 28px; border-radius: 18px; background: var(--night); color: var(--night-ink); }
.ent-cta h2 { font-size: 1.8rem; }
.ent-cta p { color: #b9c3da; margin: 10px 0 22px; }

.foot { border-top: 1px solid var(--line); background: var(--surface); }
.foot-in { max-width: 1240px; margin: 0 auto; padding: 32px var(--gutter) 40px; display: grid; gap: 10px; font-size: 16px; color: var(--mute); }
.foot-in p { margin: 0; }
.foot-brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; }
.foot-in p:last-child { display: flex; flex-wrap: wrap; gap: 6px 18px; }