:root{--bg:#f6f7fb;--paper:#fff;--ink:#0f172a;--muted:#64748b;--line:#e6e9f2;--line-2:#d5dae8;--indigo:#4f46e5;--indigo-2:#6366f1;--indigo-soft:#eef2ff;--amber:#d97706;--green:#059669;--red:#dc2626;--r:16px;--r-lg:22px;--shadow:0 1px 2px rgba(15,23,42,.04),0 8px 24px rgba(15,23,42,.06)}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Nunito",system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);line-height:1.5;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.ico{width:20px;height:20px;flex:none}.ico.small{width:16px;height:16px}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--indigo-2);outline-offset:2px}

/* ---- header du site ---- */
.site{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:28px;height:64px;padding:0 28px;background:#fff;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,#6366f1,#4f46e5);color:#fff;display:grid;place-items:center;box-shadow:0 6px 16px rgba(79,70,229,.35)}
.brand-text{display:flex;flex-direction:column;line-height:1.05}.brand-text strong{font-size:16px;font-weight:900;letter-spacing:.02em}.brand-text small{font-size:10.5px;font-weight:700;color:var(--indigo);text-transform:uppercase;letter-spacing:.06em}
.site-nav{display:flex;gap:4px;margin-left:auto}.site-nav a{padding:8px 12px;border-radius:10px;font-size:14px;font-weight:700;color:#334155}.site-nav a:hover{background:var(--indigo-soft);color:var(--indigo)}
.site-actions{display:flex;align-items:center;gap:14px}
.btn-premium{padding:8px 14px;border-radius:999px;background:linear-gradient(135deg,#fbbf24,#f59e0b);color:#3b2a00;font-weight:800;font-size:13.5px;box-shadow:0 4px 12px rgba(245,158,11,.35)}
.user{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:800;line-height:1.05}.user small{display:block;font-weight:600;color:var(--muted);font-size:11px}
.avatar{width:32px;height:32px;border-radius:50%;background:var(--indigo-soft);color:var(--indigo);display:grid;place-items:center;font-weight:900}

/* ---- coque ---- */
.shell{display:grid;grid-template-columns:270px 1fr;gap:24px;max-width:1380px;margin:24px auto;padding:0 24px}
.side{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);padding:18px 14px;position:sticky;top:88px;align-self:start;box-shadow:var(--shadow)}
.side-title{display:flex;align-items:center;gap:10px;padding:8px 10px 14px;font-weight:900;font-size:16px;color:var(--indigo);border-bottom:1px solid var(--line);margin-bottom:8px}
.side-nav{display:flex;flex-direction:column;gap:2px}
.nav-item{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:11px;font-size:14.5px;font-weight:600;color:#475569}
.nav-item:hover{background:#f1f5f9;color:var(--ink)}.nav-item.active{background:var(--indigo-soft);color:var(--indigo);font-weight:800}
.side-sep{height:1px;background:var(--line);margin:10px 4px}
.fav-link .ico{color:#e11d48}.fav-count{margin-left:auto;min-width:22px;height:22px;padding:0 7px;border-radius:999px;background:#ffe4e6;color:#be123c;font-size:12px;display:grid;place-items:center}
.main{min-width:0}

/* ---- barre haute + recherche ---- */
.topbar{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.search{position:relative;flex:1;display:flex;align-items:center;gap:10px;padding:0 16px;height:48px;background:#fff;border:1px solid var(--line);border-radius:14px;color:var(--muted);box-shadow:var(--shadow)}
.search input{flex:1;border:0;outline:0;background:transparent;font:inherit;font-size:15px;color:var(--ink)}
.search-results{position:absolute;left:0;right:0;top:calc(100% + 6px);background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 16px 40px rgba(15,23,42,.14);padding:6px;z-index:15;max-height:360px;overflow:auto}
.search-results a{display:flex;flex-direction:column;padding:10px 12px;border-radius:10px;color:var(--ink);font-weight:700;font-size:14px}.search-results a small{font-weight:600;color:var(--muted)}
.search-results a:hover,.search-results a.hl{background:var(--indigo-soft)}
.search-results .none{padding:12px;color:var(--muted);font-size:14px}

/* ---- sélecteur de classe ---- */
.levels{display:flex;gap:4px;padding:4px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow)}
.levels a{padding:7px 12px;border-radius:9px;font-weight:800;font-size:13.5px;color:#475569}.levels a:hover{background:#f1f5f9}.levels a.on{background:var(--indigo);color:#fff}

/* ---- boutons ---- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border-radius:12px;font-weight:800;font-size:14px;border:1px solid var(--line-2);background:#fff;cursor:pointer;transition:background .15s,border-color .15s}
.btn:hover{background:#f8fafc;border-color:#c7d2fe}
.btn.primary{background:var(--indigo);border-color:var(--indigo);color:#fff}.btn.primary:hover{background:#4338ca}
.btn.ghost{color:#334155}.btn.back{white-space:nowrap}

/* ---- pages liste ---- */
.page-head{margin:6px 0 22px}.page-head h1{font-size:30px;font-weight:900;letter-spacing:-.01em;margin-bottom:6px}.page-head p{color:var(--muted);font-size:15.5px;max-width:70ch}
.muted{color:var(--muted);font-size:14px!important}
.subject-head{display:flex;gap:18px;align-items:flex-start}
.subject-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:13px;flex:none}.subject-icon.big{width:60px;height:60px;border-radius:18px;background:var(--tint);color:var(--ink)}
.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}
.subject-card{display:flex;flex-direction:column;gap:12px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow);transition:transform .15s,border-color .15s}
.subject-card:hover{transform:translateY(-2px);border-color:#c7d2fe}
.subject-body b{display:block;font-size:17px;font-weight:900;margin-bottom:3px}.subject-body span{color:var(--muted);font-size:14px}
.subject-foot{display:flex;align-items:center;gap:6px;margin-top:auto;font-size:13px;font-weight:800;color:var(--indigo)}
.subject-layout{display:grid;grid-template-columns:1fr 300px;gap:22px;align-items:start}
.chapter{margin-bottom:22px}.chapter h2{font-size:17px;font-weight:900;margin-bottom:10px}
.rows{display:flex;flex-direction:column;gap:8px}
.row{display:flex;align-items:center;gap:11px;padding:11px 13px;background:#fff;border:1px solid var(--line);border-radius:13px;transition:border-color .15s,background .15s}
.row:hover{border-color:#c7d2fe;background:#f8fafc}.row .ico{color:var(--indigo)}.row-title{flex:1;font-weight:700;font-size:14.5px}.row-meta{font-size:12px;color:var(--muted);font-weight:700}
.row.draft{opacity:.7}.row.draft .ico{color:#94a3b8}.row.current{border-color:var(--indigo);background:var(--indigo-soft)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:18px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:10px}
.card h2{font-size:17px;font-weight:900;display:flex;align-items:center;gap:8px}
.card.sticky{position:sticky;top:88px}
.card .btn{justify-content:space-between}
.tip{margin-top:26px;padding:20px 22px;background:#fff;border:1px dashed #c7d2fe;border-radius:var(--r-lg)}
.tip h2{font-size:17px;font-weight:900;display:flex;align-items:center;gap:8px;margin-bottom:6px}.tip p{color:#334155;font-size:15px}.tip a{color:var(--indigo);font-weight:800}.tip .btn{margin-top:12px}

/* ---- méthodes ---- */
.methods{display:flex;flex-direction:column;gap:10px}
.method-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow);overflow:hidden}
.method-card summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:14px;padding:16px 18px}
.method-card summary::-webkit-details-marker{display:none}
.method-card summary b{display:block;font-size:16px;font-weight:900}.method-card summary small{color:var(--muted);font-size:14px}
.method-num{width:36px;height:36px;border-radius:11px;background:var(--indigo-soft);color:var(--indigo);display:grid;place-items:center;font-weight:900;flex:none}
.method-card .method{padding:0 18px 18px 68px}
.method{list-style:none;display:flex;flex-direction:column;gap:10px}
.method li{display:flex;gap:12px;align-items:flex-start;font-size:15px}
.method li b{width:26px;height:26px;border-radius:8px;background:#fce7f3;color:#be185d;display:grid;place-items:center;font-size:13px;flex:none;font-weight:900}
.methode .method li b{background:#fce7f3;color:#be185d}

/* ---- fiche ---- */
.fiche-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:22px;align-items:start}
.fiche{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:26px 28px 22px;box-shadow:var(--shadow)}
.fiche-side{display:flex;flex-direction:column;gap:16px}
.crumbs{display:flex;gap:8px;font-size:13px;color:var(--muted);font-weight:700;margin-bottom:10px}.crumbs a:hover{color:var(--indigo)}
.fiche-title-row{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.fiche h1{font-size:30px;font-weight:900;letter-spacing:-.01em}
.chip{padding:6px 12px;border-radius:999px;background:var(--tint,#eef2ff);color:var(--ink,#1e1b4b);font-size:13.5px;font-weight:800}
.fav{all:unset;cursor:pointer;margin-left:auto;width:40px;height:40px;border-radius:12px;display:grid;place-items:center;color:#e11d48;border:1px solid var(--line);transition:background .15s}
.fav:hover{background:#fff1f2}.fav[aria-pressed="true"] .ico{fill:#e11d48}.fav:focus-visible{outline:2px solid var(--indigo-2)}
.fiche-meta{display:flex;flex-wrap:wrap;gap:16px;margin:10px 0 20px;font-size:13.5px;font-weight:700;color:var(--muted)}
.badge-draft{padding:4px 10px;border-radius:999px;background:#fff7ed;color:#c2410c}
.block{margin-bottom:18px;padding:18px 20px;border-radius:var(--r);border:1px solid var(--line)}
.block h2{display:flex;align-items:center;gap:9px;font-size:18px;font-weight:900;margin-bottom:10px;color:var(--indigo)}
.block h2.c-amber{color:var(--amber)}.block h2.c-green{color:var(--green)}.block h2.c-red{color:var(--red)}.block h2.c-indigo{color:var(--indigo)}
.essentiel{background:#eef2ff;border-color:#e0e7ff}.exemple{background:#ecfdf5;border-color:#d1fae5}.erreurs{background:#fef2f2;border-color:#fee2e2}.brevet{background:#f5f3ff;border-color:#ede9fe}
.essentiel-body{display:grid;gap:18px}.essentiel-body.with-figure{grid-template-columns:1fr 200px;align-items:center}
.lead{font-size:16.5px;line-height:1.6}.formula{margin-top:10px;font-size:22px;font-weight:900;font-family:"Cambria","Georgia",serif;font-style:italic;letter-spacing:.02em}
.figure{width:100%;height:auto}
.bullets{list-style:none;display:flex;flex-direction:column;gap:7px}.bullets li{position:relative;padding-left:20px;font-size:15.5px}.bullets li::before{content:"";position:absolute;left:4px;top:.6em;width:7px;height:7px;border-radius:50%;background:currentColor;opacity:.6}
.enonce{font-size:15.5px;margin-bottom:8px}.steps{padding-left:0;list-style:none;display:flex;flex-direction:column;gap:6px}.steps li{font-family:"Cambria","Georgia",serif;font-size:18px;font-weight:700;padding:8px 12px;background:#fff;border-radius:10px}
.vocab{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}.vocab div{padding:10px 12px;background:#f8fafc;border-radius:10px}.vocab dt{font-weight:900;font-size:14.5px;margin-bottom:2px}.vocab dd{font-size:14px;color:#334155}
.quiz{background:#fff}.q{padding:12px 0;border-top:1px solid var(--line)}.q:first-of-type{border-top:0}.q-text{font-weight:800;margin-bottom:8px}
.q-opts{display:grid;gap:6px}.q-opts button{all:unset;cursor:pointer;padding:10px 14px;border-radius:10px;border:1px solid var(--line);font-size:14.5px;transition:background .15s,border-color .15s}
.q-opts button:hover{background:#f8fafc;border-color:#c7d2fe}.q-opts button:focus-visible{outline:2px solid var(--indigo-2)}
.q-opts button.ok{background:#ecfdf5;border-color:#34d399;font-weight:800}.q-opts button.ko{background:#fef2f2;border-color:#f87171}.q-opts button:disabled{cursor:default}
.q-fb{min-height:20px;margin-top:6px;font-size:14px;font-weight:700;color:#334155}
.quiz-score{margin-top:10px;padding:10px 14px;border-radius:10px;background:var(--indigo-soft);color:var(--indigo);font-weight:900}
.fiche-actions{display:flex;gap:10px;flex-wrap:wrap;margin:22px 0 14px}
.prevnext{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:8px}
.prevnext a{display:flex;align-items:center;gap:10px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;font-weight:800;font-size:14px;color:#334155}
.prevnext a:hover{border-color:#c7d2fe;background:#f8fafc}.prevnext a.next{justify-content:flex-end;text-align:right}.prevnext small{display:block;font-size:11.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}
.draft-block{background:#fff7ed;border-color:#fed7aa}.draft-block h2{color:#c2410c}.draft-block p{font-size:15.5px}
.train{gap:8px}
.foot{max-width:1380px;margin:30px auto 40px;padding:0 24px;color:var(--muted);font-size:13px}

/* ---- responsive ---- */
@media (max-width:1100px){.shell{grid-template-columns:230px 1fr}.fiche-layout{grid-template-columns:1fr}.subject-layout{grid-template-columns:1fr}.card.sticky{position:static}.site-nav{display:none}}
@media (max-width:760px){.shell{grid-template-columns:1fr;margin-top:14px}.side{position:static;padding:10px}.side-title{display:none}.side-nav{flex-direction:row;flex-wrap:wrap;gap:4px}.nav-item{padding:8px 10px;font-size:13px}.nav-item .ico{display:none}.side-sep{display:none}.fav-link{margin-top:6px}.essentiel-body.with-figure{grid-template-columns:1fr}.fiche{padding:18px}.fiche h1{font-size:24px}.user span:last-child{display:none}.site{padding:0 16px;gap:12px}}

/* ---- impression ---- */
@media print{.site,.side,.topbar,.fiche-actions,.prevnext,.fiche-side,.foot,.fav,.quiz{display:none!important}.shell{display:block;margin:0;padding:0}.fiche{border:0;box-shadow:none;padding:0}.block{break-inside:avoid;border-color:#ccc}body{background:#fff}}