:root {
  --bg: #faf9f7; --surface: #ffffff; --surface2: #f3f1ee; --text: #1c1b1a; --muted: #6b6560;
  --border: #e4e0db; --accent: #ee0000; --accent-soft: #fde8e8; --accent-text: #b80000;
  --code-bg: #1e1e24; --code-text: #e8e6e3; --code-dim: #8b8b99; --code-prompt: #ff7b72;
  --tip: #1a7f4b; --tip-bg: #e6f5ec;
  --warn: #9a6700; --warn-bg: #fff4d6;
  --trap: #8250df; --trap-bg: #f1e9fd;
  --cloud: #0b6bcb; --cloud-bg: #e5f1fc;
  --onprem: #0f766e; --onprem-bg: #dff5f2;
  --k8s: #326ce5; --k8s-bg: #e8effd;
  --ocp: #c9190b; --ocp-bg: #fde8e8;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 4px 14px rgba(0,0,0,.05);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141315; --surface: #1d1c1f; --surface2: #262529; --text: #ece9e6; --muted: #a29b94;
    --border: #34323a; --accent: #ff4d4d; --accent-soft: #3a1c1c; --accent-text: #ff8a8a;
    --code-bg: #0e0e12; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 14px rgba(0,0,0,.3);
    --tip: #5fd18f; --tip-bg: #14281d; --warn: #f0c14b; --warn-bg: #2d2511;
    --trap: #b794f6; --trap-bg: #26193d; --cloud: #6cb6ff; --cloud-bg: #12263b;
    --onprem: #4fd1c5; --onprem-bg: #11292a; --k8s: #7ba4ff; --k8s-bg: #172345;
    --ocp: #ff8a80; --ocp-bg: #3a1c1c;
  }
}
:root[data-theme="dark"] {
  --bg: #141315; --surface: #1d1c1f; --surface2: #262529; --text: #ece9e6; --muted: #a29b94;
  --border: #34323a; --accent: #ff4d4d; --accent-soft: #3a1c1c; --accent-text: #ff8a8a;
  --code-bg: #0e0e12; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 14px rgba(0,0,0,.3);
  --tip: #5fd18f; --tip-bg: #14281d; --warn: #f0c14b; --warn-bg: #2d2511;
  --trap: #b794f6; --trap-bg: #26193d; --cloud: #6cb6ff; --cloud-bg: #12263b;
  --onprem: #4fd1c5; --onprem-bg: #11292a; --k8s: #7ba4ff; --k8s-bg: #172345;
  --ocp: #ff8a80; --ocp-bg: #3a1c1c;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--accent-text); }
code { font-family: var(--mono); font-size: .88em; background: var(--surface2); border: 1px solid var(--border); padding: .08em .35em; border-radius: 5px; }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

#app { display: grid; grid-template-columns: 310px 1fr; height: 100vh; }
body.menu-closed #app { grid-template-columns: 0 1fr; }
body.menu-closed #sidebar { display: none; }

/* Sidebar */
#sidebar { background: var(--surface); border-right: 1px solid var(--border); overflow-y: auto; }
.side-head { position: sticky; top: 0; background: var(--surface); padding: 16px 16px 10px; z-index: 2; border-bottom: 1px solid var(--border); }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.15rem; color: var(--text); text-decoration: none; margin-bottom: 10px; }
.brand small { color: var(--muted); font-weight: 500; font-size: .8rem; margin-left: auto; }
#search { width: 100%; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border); background: var(--bg); color: var(--text); font: inherit; font-size: .9rem; }
#navlist { padding: 8px 8px 40px; }
.nav-home, .nav-mod-h { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-radius: 8px; text-decoration: none; color: var(--text); font-size: .93rem; }
.nav-home:hover, .nav-mod-h:hover { background: var(--surface2); }
.nav-home.on { background: var(--accent-soft); }
.nav-mod-h .e { font-size: 1.15rem; }
.nav-mod-h .t { flex: 1; line-height: 1.25; }
.nav-mod-h .t b { color: var(--muted); font-weight: 600; margin-right: 2px; }
.nav-mod-h .pct { font-size: .72rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.nav-mod.open > .nav-mod-h { background: var(--accent-soft); font-weight: 600; }
.nav-mod ol { list-style: none; margin: 4px 0 8px 22px; padding: 0 0 0 10px; border-left: 2px solid var(--border); }
.nav-mod li a { display: block; padding: 4px 8px; font-size: .84rem; color: var(--muted); text-decoration: none; border-radius: 6px; }
.nav-mod li a:hover { background: var(--surface2); color: var(--text); }
.nav-mod li a.seen::before { content: "✓ "; color: var(--tip); }
.nav-mod li a.on { color: var(--accent-text); font-weight: 700; background: var(--accent-soft); }
.search-res a { display: block; padding: 7px 10px; border-radius: 8px; text-decoration: none; color: var(--text); font-size: .88rem; }
.search-res a:hover { background: var(--surface2); }
.search-res small { display: block; color: var(--muted); }
.search-empty { color: var(--muted); padding: 10px; font-size: .9rem; }

/* Main */
#main { display: flex; flex-direction: column; min-width: 0; height: 100vh; }
#topbar { display: flex; align-items: center; gap: 12px; padding: 8px 18px; border-bottom: 1px solid var(--border); background: var(--surface); }
#topbar button { background: none; border: 1px solid var(--border); border-radius: 8px; padding: 4px 10px; }
#topbar button:hover { background: var(--surface2); }
#crumb { flex: 1; font-size: .9rem; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#crumb b { color: var(--text); }
#counter { font-size: .8rem; color: var(--muted); font-variant-numeric: tabular-nums; }
#progress { height: 3px; background: var(--border); }
#progress i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .3s; }
#slide { flex: 1; overflow-y: auto; padding: 30px clamp(16px, 4vw, 56px) 40px; outline: none; }
.slide-inner { max-width: 1040px; margin: 0 auto; animation: pop .25s ease-out; }
@keyframes pop { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .slide-inner { animation: none; } * { transition: none !important; } }
#nav { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 18px; border-top: 1px solid var(--border); background: var(--surface); }
#nav button { background: var(--surface2); border: 1px solid var(--border); border-radius: 10px; padding: 8px 16px; font-weight: 600; }
#nav button:hover:not(:disabled) { background: var(--accent-soft); }
#nav button:disabled { opacity: .35; cursor: default; }
#next.has-frag { background: var(--accent); color: #fff; border-color: var(--accent); }
/* Sélecteur de langue (maquette course_shell / i18n_fr_en) : mêmes jetons, aucune couleur nouvelle */
.lang { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; background: var(--surface); flex: none; }
#topbar .lang button, .lang button { border: 0; border-radius: 0; background: none; padding: 3px 9px; font-size: .78rem; font-weight: 700; letter-spacing: .05em; color: var(--muted); line-height: 1.5; }
.lang button + button { border-left: 1px solid var(--border); }
.lang button:hover:not([aria-pressed="true"]), #topbar .lang button:hover:not([aria-pressed="true"]) { background: var(--surface2); color: var(--text); }
.lang button[aria-pressed="true"], #topbar .lang button[aria-pressed="true"] { background: var(--accent-soft); color: var(--accent-text); cursor: default; }
.lang button:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.lang-row { display: none; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 16px; border-top: 1px solid var(--border); font-size: .85rem; color: var(--muted); }
#toast { position: fixed; left: 50%; bottom: 64px; transform: translateX(-50%) translateY(8px); background: var(--text); color: var(--bg); padding: 7px 14px; border-radius: 999px; font-size: .85rem; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 40; }
#toast.on { opacity: 1; transform: translateX(-50%); }
.fb-content { display: contents; }
.fallback-banner { background: var(--cloud-bg); border-left: 4px solid var(--cloud); border-radius: 10px; padding: 8px 14px; margin-bottom: 14px; font-size: .9rem; }
#hint { font-size: .78rem; color: var(--muted); text-align: center; }

h1, h2, h3 { line-height: 1.2; margin: 0; }
h2.stitle { font-size: 1.9rem; margin-bottom: 18px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.stag { font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; padding: 3px 9px; border-radius: 999px; background: var(--accent-soft); color: var(--accent-text); }

/* Blocks */
.blocks { display: flex; flex-direction: column; gap: 16px; }
.blocks.two { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 24px; align-items: start; }
.blocks.two > .wide { grid-column: 1 / -1; }
@media (max-width: 800px) { .blocks.two { grid-template-columns: 1fr; } }
.blk.text { font-size: 1.08rem; }
.blk.text p { margin: 0 0 .6em; }
ul.bullets { margin: 0; padding-left: 1.2rem; font-size: 1.05rem; }
ul.bullets li { margin: .35em 0; }
ul.bullets li::marker { color: var(--accent); }
.frag { transition: opacity .25s, transform .25s; }
.frag:not(.show) { opacity: 0; transform: translateY(6px); pointer-events: none; }

/* Cover / home */
.cover { text-align: center; padding: 20px 0; }
.cover .big { font-size: 5rem; line-height: 1; margin-bottom: 8px; }
.cover .num { color: var(--accent-text); font-weight: 800; letter-spacing: .12em; text-transform: uppercase; font-size: .85rem; }
.cover h1 { font-size: 2.6rem; margin: 6px 0 10px; }
.cover .tagline { color: var(--muted); font-size: 1.2rem; margin: 0 auto 26px; max-width: 640px; }
.cover .obj { text-align: left; max-width: 640px; margin: 0 auto; background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 18px 22px; box-shadow: var(--shadow); }
.cover .obj h3 { font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin-bottom: 8px; }
.cover .obj ul { margin: 0; padding-left: 1.2rem; }
.cover .meta { margin-top: 16px; color: var(--muted); font-size: .9rem; }
.home h1 { font-size: 2.6rem; margin-bottom: 6px; }
.home .sub { color: var(--muted); font-size: 1.15rem; margin-bottom: 22px; }
.home .actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 26px; }
.btn { display: inline-block; padding: 10px 18px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface); text-decoration: none; color: var(--text); font-weight: 600; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.mgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.mcard { display: block; padding: 16px; border-radius: 16px; background: var(--surface); border: 1px solid var(--border); text-decoration: none; color: var(--text); box-shadow: var(--shadow); transition: transform .15s, border-color .15s; }
.mcard:hover { transform: translateY(-3px); border-color: var(--accent); }
.mcard .e { font-size: 2rem; }
.mcard .n { font-size: .72rem; color: var(--muted); font-weight: 700; letter-spacing: .08em; }
.mcard h3 { font-size: 1.05rem; margin: 2px 0 4px; }
.mcard p { margin: 0 0 10px; font-size: .86rem; color: var(--muted); }
.bar { height: 6px; border-radius: 99px; background: var(--surface2); overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--accent); }
.legend { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 8px; font-size: .85rem; color: var(--muted); align-items: center; }

/* Tags */
.tag { display: inline-block; font-size: .72rem; font-weight: 700; padding: 1px 8px; border-radius: 999px; vertical-align: .08em; }
.tag.onprem { background: var(--onprem-bg); color: var(--onprem); }
.tag.cloud { background: var(--cloud-bg); color: var(--cloud); }
.tag.k8s { background: var(--k8s-bg); color: var(--k8s); }
.tag.ocp { background: var(--ocp-bg); color: var(--ocp); }

/* Callouts */
.callout { border-left: 5px solid; border-radius: 10px; padding: 12px 16px; font-size: .98rem; }
.callout .ch { font-weight: 800; font-size: .78rem; text-transform: uppercase; letter-spacing: .07em; margin-bottom: 3px; }
.callout p { margin: 0; }
.callout.tip { background: var(--tip-bg); border-color: var(--tip); } .callout.tip .ch { color: var(--tip); }
.callout.warn { background: var(--warn-bg); border-color: var(--warn); } .callout.warn .ch { color: var(--warn); }
.callout.trap { background: var(--trap-bg); border-color: var(--trap); } .callout.trap .ch { color: var(--trap); }
.callout.cloud { background: var(--cloud-bg); border-color: var(--cloud); } .callout.cloud .ch { color: var(--cloud); }
.callout.onprem { background: var(--onprem-bg); border-color: var(--onprem); } .callout.onprem .ch { color: var(--onprem); }
.callout.k8s { background: var(--k8s-bg); border-color: var(--k8s); } .callout.k8s .ch { color: var(--k8s); }
.callout.ocp { background: var(--ocp-bg); border-color: var(--ocp); } .callout.ocp .ch { color: var(--ocp); }

/* Code */
.codebox { border-radius: 12px; overflow: hidden; background: var(--code-bg); box-shadow: var(--shadow); }
.codebar { display: flex; align-items: center; gap: 8px; padding: 6px 12px; background: rgba(255,255,255,.06); color: var(--code-dim); font-size: .78rem; font-family: var(--mono); }
.codebar .dots { display: flex; gap: 5px; } .codebar .dots i { width: 9px; height: 9px; border-radius: 50%; background: #555; display: block; }
.codebar .dots i:nth-child(1) { background: #ff5f56; } .codebar .dots i:nth-child(2) { background: #ffbd2e; } .codebar .dots i:nth-child(3) { background: #27c93f; }
.codebar .fn { flex: 1; }
.copy { background: rgba(255,255,255,.1); border: 0; color: #ddd; border-radius: 6px; padding: 2px 9px; font-size: .75rem; }
.copy:hover { background: rgba(255,255,255,.2); }
.codebox pre { margin: 0; padding: 14px 16px; overflow-x: auto; color: var(--code-text); font: .86rem/1.55 var(--mono); }
.c-cm { color: var(--code-dim); } .c-ps { color: var(--code-prompt); user-select: none; }
.codecap { font-size: .85rem; color: var(--muted); margin-top: 6px; }

/* Tables */
.tablewrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); box-shadow: var(--shadow); }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
th, td { text-align: left; padding: 9px 13px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--surface2); font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: var(--surface2); }

/* Compare */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 800px) { .compare { grid-template-columns: 1fr; } }
.cside { border-radius: 14px; padding: 16px 18px; border: 1px solid var(--border); background: var(--surface); box-shadow: var(--shadow); }
.cside.l { border-top: 5px solid var(--k8s); } .cside.r { border-top: 5px solid var(--ocp); }
.cside h3 { font-size: 1.1rem; margin-bottom: 8px; }
.cside ul { margin: 0; padding-left: 1.1rem; } .cside li { margin: .3em 0; }
.verdict { margin-top: 10px; text-align: center; font-weight: 600; color: var(--muted); }

/* Flow */
.flow { display: flex; flex-wrap: wrap; align-items: stretch; gap: 8px; }
.fnode { flex: 1 1 120px; background: var(--surface); border: 2px solid var(--border); border-radius: 12px; padding: 10px 12px; text-align: center; box-shadow: var(--shadow); }
.fnode b { display: block; } .fnode small { color: var(--muted); display: block; font-size: .8rem; }
.fnode.hl { border-color: var(--accent); background: var(--accent-soft); }
.farrow { align-self: center; color: var(--accent); font-weight: 800; font-size: 1.3rem; }
.flowcap, .dcap { font-size: .85rem; color: var(--muted); margin-top: 6px; text-align: center; }

/* Layers */
.layers { display: flex; flex-direction: column; gap: 6px; }
.layer { display: flex; align-items: center; gap: 14px; padding: 11px 16px; border-radius: 11px; background: var(--surface); border: 1px solid var(--border); border-left: 6px solid var(--border); }
.layer b { min-width: 190px; } .layer span { color: var(--muted); font-size: .92rem; }
.layer.hl { border-left-color: var(--accent); background: var(--accent-soft); }
.layer.base { border-left-color: var(--k8s); background: var(--k8s-bg); }
@media (max-width: 700px) { .layer { flex-direction: column; align-items: flex-start; gap: 2px; } .layer b { min-width: 0; } }

/* Cards (flip) */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; }
.card { perspective: 800px; height: 130px; cursor: pointer; border: 0; background: none; padding: 0; text-align: center; }
.card .in { position: relative; width: 100%; height: 100%; transition: transform .45s; transform-style: preserve-3d; }
.card.flipped .in { transform: rotateY(180deg); }
.card .f, .card .b { position: absolute; inset: 0; backface-visibility: hidden; display: flex; align-items: center; justify-content: center; padding: 12px; border-radius: 14px; border: 1px solid var(--border); box-shadow: var(--shadow); font-size: .95rem; }
.card .f { background: var(--k8s-bg); font-weight: 700; flex-direction: column; gap: 4px; }
.card .f small { font-weight: 500; color: var(--muted); font-size: .72rem; }
.card .b { background: var(--ocp-bg); transform: rotateY(180deg); }

/* Quiz */
.quiz { background: var(--surface); border: 2px dashed var(--border); border-radius: 16px; padding: 16px 18px; }
.quiz .q { font-weight: 700; font-size: 1.05rem; margin-bottom: 10px; }
.quiz .q::before { content: "🎯 "; }
.opts { display: grid; gap: 8px; }
.opt { text-align: left; padding: 10px 14px; border-radius: 10px; background: var(--surface2); border: 2px solid transparent; }
.opt:hover { border-color: var(--accent); }
.quiz.done .opt { cursor: default; }
.quiz.done .opt:hover { border-color: transparent; }
.opt.ok { background: var(--tip-bg); border-color: var(--tip) !important; }
.opt.ko { background: var(--ocp-bg); border-color: var(--ocp) !important; }
.explain { display: none; margin-top: 10px; font-size: .95rem; }
.quiz.done .explain { display: block; }
.quiz .redo { display: none; margin-top: 8px; background: none; border: 1px solid var(--border); border-radius: 8px; padding: 3px 10px; font-size: .8rem; }
.quiz.done .redo { display: inline-block; }

/* Reveal */
details.reveal { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 10px 16px; }
details.reveal summary { cursor: pointer; font-weight: 700; color: var(--accent-text); }
details.reveal > div { margin-top: 8px; }

/* Lab */
.lab { background: var(--surface); border: 2px solid var(--accent); border-radius: 16px; padding: 16px 20px; }
.lab h3 { font-size: 1.15rem; margin-bottom: 4px; } .lab h3::before { content: "🧪 "; }
.lab .goal { color: var(--muted); margin: 0 0 10px; }
.lab ol { list-style: none; margin: 0; padding: 0; counter-reset: s; }
.lab li { counter-increment: s; margin: 8px 0; }
.lab label { display: flex; gap: 10px; align-items: flex-start; cursor: pointer; }
.lab label::before { content: counter(s); flex: none; width: 24px; height: 24px; border-radius: 50%; background: var(--accent-soft); color: var(--accent-text); font-weight: 800; font-size: .8rem; display: grid; place-items: center; }
.lab input { margin-top: 5px; accent-color: var(--accent); }
.lab input:checked + span { text-decoration: line-through; opacity: .55; }

/* Cmds */
.cmds { display: grid; grid-template-columns: minmax(220px, auto) 1fr; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; background: var(--surface); box-shadow: var(--shadow); }
.cmds > div { padding: 8px 14px; border-bottom: 1px solid var(--border); }
.cmds > div:nth-last-child(-n+2) { border-bottom: 0; }
.cmds .cm { font-family: var(--mono); font-size: .85rem; background: var(--surface2); }
@media (max-width: 700px) { .cmds { grid-template-columns: 1fr; } }

.diagram { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 14px; overflow-x: auto; }
.diagram svg { max-width: 100%; height: auto; display: block; margin: 0 auto; }

/* Recap */
.recap h2 { font-size: 1.9rem; margin-bottom: 14px; }
.recap ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.recap li { background: var(--tip-bg); border-left: 5px solid var(--tip); border-radius: 10px; padding: 10px 16px; }
.recap li::before { content: "✅ "; }
.score { margin-top: 18px; font-size: 1.05rem; }

/* Mobile */
@media (max-width: 900px) {
  #app { grid-template-columns: 1fr; }
  #sidebar { position: fixed; inset: 0 18% 0 0; z-index: 30; transform: translateX(-102%); transition: transform .2s; box-shadow: var(--shadow); }
  body.menu-open #sidebar { transform: none; }
  body.menu-closed #app { grid-template-columns: 1fr; }
  body.menu-closed #sidebar { display: block; }
  #hint { display: none; }
  .lang-row { display: flex; }
  .cover h1, .home h1 { font-size: 2rem; }
}

/* Modules « à venir » (plan sans fichier chargé) : grisés, non cliquables */
.nav-mod.soon .nav-mod-h, .mcard.soon { cursor: default; color: var(--muted); }
.nav-mod.soon .nav-mod-h .e, .mcard.soon .e { opacity: .55; }
.mcard.soon h3 { color: var(--muted); }
.nav-mod.soon .nav-mod-h:hover { background: none; }
.mcard.soon { border-style: dashed; box-shadow: none; }
.mcard.soon:hover { transform: none; border-color: var(--border); }

@media (max-width: 480px) { #counter { display: none; } }