/* ===== Tutoriel LaTeX interactif — sarmate.net ===== */
.tx-body{background:#f6f8fb;color:#1f2937;font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.65}
.tx-body button{position:static}
.tx-wrap{max-width:960px;margin:0 auto;padding:0 20px 60px}
a{color:#3c78aa}

/* ---- Hub ---- */
.tx-hero{text-align:center;padding:48px 16px 26px}
.tx-hero-eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:#3c78aa;background:#eaf2f9;padding:5px 12px;border-radius:999px;margin-bottom:14px}
.tx-hero h1{font-size:2.2rem;line-height:1.2;color:#0f172a;margin:.1em 0 .4em;font-weight:800}
.tx-hero p{max-width:640px;margin:0 auto 20px;font-size:1.1rem;color:#334155}
.tx-hero-progress{max-width:420px;margin:0 auto;font-size:.9rem;color:#475569}
.tx-bar{height:10px;background:#e2e8f0;border-radius:999px;overflow:hidden;margin-bottom:6px}
.tx-bar-fill{display:block;height:100%;width:0;background:linear-gradient(90deg,#3c78aa,#508cbe);transition:width .4s}
.tx-module{background:#fff;border:1px solid #e5e7eb;border-radius:16px;padding:22px 24px;margin:18px 0}
.tx-module-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;flex-wrap:wrap}
.tx-level{display:inline-block;font-size:.75rem;font-weight:700;color:#508cbe;text-transform:uppercase;letter-spacing:.03em}
.tx-module-head h2{margin:.15em 0 .3em;font-size:1.4rem;color:#0f172a}
.tx-module-intro{margin:0;color:#64748b}
.tx-mini-bar{min-width:150px;font-size:.82rem;color:#64748b;text-align:right}
.tx-lessons{list-style:none;padding:0;margin:16px 0 0}
.tx-lesson-card{display:flex;align-items:center;gap:14px;padding:14px 16px;border:1px solid #e5e7eb;border-radius:12px;margin:10px 0;text-decoration:none;color:inherit;transition:all .15s;background:#fff}
.tx-lesson-card:hover{border-color:#3c78aa;box-shadow:0 4px 14px rgba(60,120,170,.12);transform:translateY(-1px)}
.tx-num{flex:0 0 32px;height:32px;border-radius:50%;background:#eaf2f9;color:#3c78aa;font-weight:700;display:flex;align-items:center;justify-content:center}
.tx-lc-body{flex:1}
.tx-lc-title{display:block;font-weight:700;color:#0f172a}
.tx-lc-desc{display:block;font-size:.9rem;color:#64748b;margin-top:2px}
.tx-tick{flex:0 0 26px;height:26px;border-radius:50%;border:2px solid #cbd5e1;color:transparent;display:flex;align-items:center;justify-content:center;font-size:.75rem}
.done .tx-tick,.tx-lesson-card.done .tx-tick,.tx-toc-link.done .tx-tick{background:#22a06b;border-color:#22a06b;color:#fff}
.tx-comingsoon{text-align:center;color:#94a3b8;margin-top:22px}

/* ---- Leçon : layout 2 colonnes ---- */
.tx-layout{max-width:1080px;margin:0 auto;padding:22px 20px 60px;display:grid;grid-template-columns:260px 1fr;gap:34px;align-items:start}
.tx-toc{position:sticky;top:78px;background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:14px}
.tx-toc-back{display:inline-flex;gap:8px;align-items:center;font-weight:600;text-decoration:none;margin-bottom:10px;font-size:.9rem}
.tx-toc-mod{font-size:.72rem;text-transform:uppercase;letter-spacing:.04em;color:#94a3b8;font-weight:700;margin:12px 4px 6px}
.tx-toc-link{display:flex;align-items:center;gap:9px;padding:8px 10px;border-radius:9px;text-decoration:none;color:#334155;font-size:.92rem}
.tx-toc-link:hover{background:#f1f5f9}
.tx-toc-link.active{background:#eaf2f9;color:#1a5a8a;font-weight:600}
.tx-toc-link .tx-tick{flex:0 0 20px;height:20px;font-size:.62rem}
.tx-main{min-width:0}
.tx-crumb{font-size:.88rem;color:#64748b;margin-bottom:6px}
.tx-crumb a{text-decoration:none}
.tx-main h1{font-size:1.9rem;color:#0f172a;margin:.1em 0 .5em;font-weight:800}
.tx-content h2{font-size:1.3rem;color:#0f172a;margin:1.6em 0 .4em}
.tx-content ul{padding-left:1.2em}.tx-content li{margin:.35em 0}
.tx-exprog{position:sticky;top:64px;z-index:30;display:flex;align-items:center;gap:12px;margin:0 0 18px;padding:9px 14px;font-size:.9rem;color:#475569;background:#f6f8fb;border:1px solid #e5e7eb;border-radius:10px;box-shadow:0 2px 8px rgba(15,23,42,.06)}
.tx-exprog .tx-bar{flex:1;max-width:240px;margin:0}
.tx-exprog-label{font-weight:700;white-space:nowrap;color:#1a5a8a}
.tx-lede{font-size:1.1rem;color:#334155}
.tx-content code{background:#eef2f7;padding:1px 5px;border-radius:4px;font-size:.9em;color:#1f2937}
.tx-content pre[class*="language-"],.tx-content pre{background:#2d2d2d !important;border-radius:8px;padding:14px 16px;overflow-x:auto;margin:8px 0}
.tx-content pre code,.tx-content pre code[class*="language-"]{background:transparent !important;padding:0;border-radius:0;color:#e6e6e6;font-size:.85rem}
.tx-code{border-radius:8px;font-size:.85rem}
.tx-tip{background:#fffbeb;border-left:4px solid #f59e0b;border-radius:8px;padding:12px 16px;margin:18px 0}

/* ---- Exercice ---- */
.tx-ex{border:1px solid #e5e7eb;border-left:4px solid #3c78aa;border-radius:12px;padding:16px 18px;margin:20px 0;background:#fff}
.tx-ex.done{border-left-color:#22a06b;background:#f6fdf9}
.tx-ex-head{margin-bottom:10px}
.tx-badge{display:inline-block;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.03em;padding:3px 9px;border-radius:999px;margin-right:8px;vertical-align:middle}
.tx-run2{}
.tx-badge.tx-run{background:#eaf2f9;color:#1a5a8a}
.tx-badge.tx-modify{background:#eef7f0;color:#1f7a4d}
.tx-badge.tx-complete{background:#fef3e2;color:#b45309}
.tx-badge.tx-fix{background:#fdecec;color:#b91c1c}
.tx-instr{color:#334155}
.tx-embed{position:relative;margin:12px 0}
.tx-precode{border-radius:8px;font-size:.84rem;margin:0}
.tx-run{margin-top:10px;display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#3c78aa,#508cbe);color:#fff;border:none;padding:10px 18px;border-radius:9px;font-weight:600;font-size:.95rem;cursor:pointer}
.tx-run:hover{filter:brightness(1.05)}
.tx-iframe{width:100%;height:440px;border:1px solid #e2e8f0;border-radius:10px;display:block}
.tx-sol{margin:10px 0 4px}
.tx-sol summary{cursor:pointer;color:#3c78aa;font-weight:600;font-size:.9rem}
.tx-sol pre{margin-top:8px;border-radius:8px;font-size:.84rem}
.tx-done-ex{display:flex;align-items:center;gap:8px;margin-top:12px;font-size:.92rem;color:#475569;cursor:pointer;user-select:none}
.tx-done-ex input{width:17px;height:17px;cursor:pointer}

.tx-lesson-done{margin:26px 0 10px;padding:14px 18px;background:#eaf2f9;border-radius:12px}
.tx-lesson-done label{display:flex;align-items:center;gap:10px;cursor:pointer}
.tx-lesson-done input{width:19px;height:19px}
.tx-nav{display:flex;justify-content:space-between;gap:14px;margin-top:22px}
.tx-nav a{display:inline-flex;align-items:center;gap:8px;padding:11px 16px;border:1px solid #cbd7e6;border-radius:10px;text-decoration:none;color:#1a5a8a;font-weight:600;background:#fff}
.tx-nav-next{background:linear-gradient(135deg,#3c78aa,#508cbe)!important;color:#fff!important;border:none!important}

.tx-nudge{background:linear-gradient(135deg,#ecfdf5,#eaf2f9);border:1px solid #34d399;border-radius:12px;padding:12px 16px;margin:0 0 18px;color:#065f46;font-size:.95rem;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.tx-nudge-btn{margin-left:auto;background:#0f172a;color:#fff;padding:8px 14px;border-radius:8px;text-decoration:none;font-weight:600;font-size:.88rem}
.tx-final{margin-top:26px;text-align:center;background:linear-gradient(135deg,#eaf2f9,#eef7f1);border:1px solid #d6e3ef;border-radius:16px;padding:26px}
.tx-final-btn{display:inline-flex;align-items:center;gap:9px;margin-top:10px;background:linear-gradient(135deg,#3c78aa,#508cbe);color:#fff;padding:12px 24px;border-radius:10px;text-decoration:none;font-weight:700}

@media(max-width:860px){
  .tx-layout{grid-template-columns:1fr;gap:18px}
  .tx-toc{position:static;order:2}
  .tx-hero h1{font-size:1.7rem}
}