:root{
  --primary:#1967d2;--dark:#114b9e;--bg:#edf3fb;--panel:#fff;--line:#d6e0ee;--text:#132033;--muted:#607089;
  --danger:#ef4444;--success:#10b981;--warning:#f59e0b;--purple:#7c3aed;--code:#0f172a;
  --shadow:0 6px 18px rgba(15,23,42,.10);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{min-height:100vh;font-family:"Segoe UI",Arial,sans-serif;background:var(--bg);color:var(--text)}
header{min-height:58px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 18px;box-shadow:0 2px 8px rgba(0,0,0,.18)}
.header-left{display:flex;align-items:center;gap:14px;min-width:0}.btn-voltar{display:inline-flex;align-items:center;text-decoration:none;background:#0f3f86;color:#fff;border:1px solid rgba(255,255,255,.25);border-radius:999px;padding:7px 14px;font-size:13px;font-weight:900;white-space:nowrap;transition:.18s}.btn-voltar:hover{background:#0b3270}header h1{font-size:18px;font-weight:900;letter-spacing:-.3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.brand{font-size:13px;font-weight:800;white-space:nowrap}
.app{display:grid;grid-template-columns:250px 1fr;min-height:calc(100vh - 58px)}
nav{background:#fff;border-right:1px solid var(--line);padding:14px 10px;overflow:auto}nav h3{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:6px 8px 12px}.nav-link{display:block;width:100%;border:0;background:transparent;text-align:left;color:#0f172a;font-family:inherit;font-size:13px;font-weight:800;padding:10px 10px;border-radius:9px;margin-bottom:5px;cursor:pointer}.nav-link:hover{background:#eaf2ff;color:var(--primary)}.nav-link.active{background:var(--primary);color:#fff;box-shadow:0 2px 7px rgba(25,103,210,.35)}
main{padding:18px;overflow:auto}.module{display:none}.module.active{display:block}.hero{background:linear-gradient(135deg,#eaf2ff,#ffffff);border:1px solid #bfdbfe;border-radius:18px;padding:26px;margin-bottom:16px;box-shadow:var(--shadow)}.kicker{display:inline-block;background:#dbeafe;color:#0f3f86;border:1px solid #bfdbfe;border-radius:999px;padding:5px 10px;font-size:12px;font-weight:900;text-transform:uppercase;letter-spacing:.06em;margin-bottom:10px}.hero h2{font-size:clamp(28px,3.2vw,42px);line-height:1.08;color:var(--dark);margin-bottom:10px}.hero p{line-height:1.65;max-width:1050px;font-size:16px}
.chapter{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:24px;line-height:1.68}.chapter h2{font-size:25px;color:#0f3f86;margin:32px 0 10px;letter-spacing:-.2px}.chapter h2:first-child{margin-top:0}.chapter h3{color:var(--dark);font-size:19px;margin:20px 0 8px}.chapter p{margin:10px 0}.chapter ul,.chapter ol{margin:10px 0 10px 26px}.chapter li{margin:5px 0}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:15px 0}.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:15px 0}.card{background:#fff;border:1px solid var(--line);border-radius:13px;box-shadow:0 4px 14px rgba(15,23,42,.08);overflow:hidden}.card-body{padding:15px;line-height:1.55}.card h3{color:var(--dark);margin:0 0 8px}.problem{border-left:5px solid var(--danger);background:#fff1f2}.solution{border-left:5px solid var(--success);background:#ecfdf5}.note{border-left:5px solid var(--warning);background:#fff7d6}.idea{border-left:5px solid var(--purple);background:#f5f3ff}.visual{border:1px solid var(--line);background:#f8fbff;border-radius:13px;padding:16px;margin:14px 0;overflow:auto}.flow{display:flex;flex-wrap:wrap;align-items:center;gap:10px}.node{background:#fff;border:2px solid var(--primary);color:var(--dark);border-radius:12px;padding:12px 16px;font-weight:900;text-align:center;min-width:110px}.arrow{font-size:24px;font-weight:900;color:#334155}pre{background:var(--code);color:#f8fafc;border-radius:10px;padding:14px;margin:12px 0;white-space:pre-wrap;overflow:auto;font-family:Consolas,"Courier New",monospace;font-size:13.5px;line-height:1.5}.sql-table{border-collapse:collapse;width:100%;margin:12px 0;font-size:14px;background:#fff}.sql-table th{background:#eaf2ff;color:#114b9e}.sql-table th,.sql-table td{border:1px solid #d6e0ee;padding:8px;text-align:left}.tag{display:inline-block;border-radius:999px;padding:3px 9px;font-size:11px;font-weight:900;margin:2px 4px 2px 0;background:#e0f2fe;color:#075985;border:1px solid #bae6fd}.timeline{display:grid;gap:10px;margin:14px 0}.timeline-item{background:#fff;border:1px solid var(--line);border-left:5px solid var(--primary);border-radius:12px;padding:14px;box-shadow:0 3px 10px rgba(15,23,42,.06)}.placeholder .chapter{min-height:260px}

/* ===== Exercícios — estrutura por capítulos ===== */
.exercise-home{display:block}
.exercise-home.hidden{display:none}
.exercise-chapter-view{display:none}
.exercise-chapter-view.active{display:block}
.exercise-menu-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:13px;
  margin-top:14px;
}
.exercise-chapter-card{
  border:1px solid var(--line);
  background:#fff;
  border-radius:14px;
  padding:15px;
  box-shadow:var(--shadow);
  text-align:left;
  cursor:pointer;
  transition:.16s;
  font-family:inherit;
  color:inherit;
}
.exercise-chapter-card:hover{
  transform:translateY(-2px);
  border-color:#9cc2f5;
  box-shadow:0 10px 24px rgba(15,23,42,.12);
}
.exercise-chapter-card h3{
  color:var(--dark);
  font-size:17px;
  margin-bottom:8px;
}
.exercise-chapter-card p{
  color:#334155;
  font-size:13px;
  line-height:1.45;
  margin-bottom:10px;
}
.exercise-status{
  display:inline-flex;
  align-items:center;
  border-radius:999px;
  padding:5px 9px;
  font-size:11px;
  font-weight:900;
}
.exercise-status.available{
  background:#ecfdf5;
  color:#047857;
  border:1px solid #a7f3d0;
}
.exercise-status.building{
  background:#fff7ed;
  color:#c2410c;
  border:1px solid #fdba74;
}
.exercise-back{
  border:0;
  background:#1967d2;
  color:white;
  border-radius:999px;
  padding:8px 13px;
  font-size:13px;
  font-weight:900;
  cursor:pointer;
  margin-bottom:12px;
}
.exercise-back:hover{background:#114b9e}
.exercise-set{
  display:grid;
  gap:10px;
  margin-top:14px;
}
.exercise-item{
  border:1px solid var(--line);
  border-radius:13px;
  background:#fff;
  box-shadow:0 4px 14px rgba(15,23,42,.07);
  overflow:hidden;
}
.exercise-item summary{
  cursor:pointer;
  list-style:none;
  padding:14px 15px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  font-weight:900;
  color:#0f3f86;
  background:#f8fbff;
}
.exercise-item summary::-webkit-details-marker{display:none}
.exercise-item summary::after{
  content:"+";
  font-size:20px;
  color:#1967d2;
}
.exercise-item[open] summary::after{content:"−"}
.exercise-content{
  padding:15px;
  line-height:1.6;
}
.exercise-meta{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin:8px 0 12px;
}
.meta-pill{
  display:inline-flex;
  border-radius:999px;
  padding:4px 8px;
  font-size:11px;
  font-weight:900;
  border:1px solid #d6e0ee;
  background:#f8fafc;
  color:#334155;
}
.meta-basic{background:#ecfdf5;color:#047857;border-color:#a7f3d0}
.meta-medium{background:#fff7ed;color:#c2410c;border-color:#fdba74}
.meta-hard{background:#fef2f2;color:#b91c1c;border-color:#fecaca}
.answer-space{
  border:1px dashed #cbd5e1;
  border-radius:10px;
  background:#f8fafc;
  padding:12px;
  margin-top:10px;
  color:#64748b;
  font-size:13px;
}
@media(max-width:900px){
  .exercise-menu-grid{grid-template-columns:1fr}
}

@media(max-width:1050px){.app{grid-template-columns:1fr}nav{position:sticky;top:0;z-index:10;display:flex;gap:6px;overflow-x:auto;border-right:0;border-bottom:1px solid var(--line)}nav h3{display:none}.nav-link{min-width:max-content}.grid,.grid2{grid-template-columns:1fr}}
@media(max-width:720px){header{align-items:flex-start;flex-direction:column}.header-left{flex-wrap:wrap}header h1{font-size:16px;white-space:normal}.brand{font-size:12px}main{padding:12px}.chapter{padding:16px}}

.codebox{position:relative;background:#07111f;border:1px solid #1e3a5f;border-radius:14px;margin:18px 0;overflow:hidden;box-shadow:0 10px 25px rgba(0,0,0,.18)}
.codebox pre{margin:0;padding:44px 18px 18px;background:#07111f;color:#e5f0ff;overflow:auto;font-family:"JetBrains Mono","Consolas",monospace;font-size:.92rem;line-height:1.55}
.codebox code{font-family:inherit}
.copy-btn{position:absolute;top:10px;right:10px;border:1px solid #355985;background:#f59e0b;color:#111827;border-radius:999px;padding:6px 12px;font-weight:800;cursor:pointer;font-size:.78rem}
.copy-btn.copied{background:#22c55e;color:#052e16}


/* Estrutura premium do módulo 99 Exercícios */
#mod-exercicios article.chapter{
  min-height:auto !important;
  padding:24px !important;
}
#mod-exercicios .exercise-home.hidden{
  display:none !important;
}
#mod-exercicios .exercise-chapter-view{
  display:none;
}
#mod-exercicios .exercise-chapter-view.active{
  display:block;
}
#mod-exercicios .exercise-inner-card{
  background:#fff;
  border:1px solid #dbe7ff;
  border-radius:24px;
  padding:22px;
  box-shadow:0 8px 24px rgba(15,23,42,.06);
}
#mod-exercicios .exercise-back.inside-card{
  margin-top:0 !important;
  margin-bottom:18px !important;
}


.der-entity{fill:#ffffff;stroke:#111827;stroke-width:2.2}
      .der-rel{fill:#ffffff;stroke:#111827;stroke-width:1.8}
      .der-line{stroke:#111827;stroke-width:1.8;fill:none}
      .der-text{font-family:Segoe UI,Arial,sans-serif;font-size:23px;font-weight:800;fill:#000}
      .der-small{font-family:Segoe UI,Arial,sans-serif;font-size:18px;font-weight:800;fill:#000}
      .der-card{font-family:Segoe UI,Arial,sans-serif;font-size:17px;font-weight:700;fill:#000}
      .der-pk{fill:#27339b;stroke:#111827;stroke-width:1.2}
      .der-attr{fill:#ffffff;stroke:#111827;stroke-width:1.2}
      .der-muted{font-family:Segoe UI,Arial,sans-serif;font-size:15px;font-weight:700;fill:#334155}
    
.codebox{position:relative;background:#07111f;border:1px solid #1e3a5f;border-radius:14px;margin:18px 0;overflow:hidden;box-shadow:0 10px 25px rgba(0,0,0,.18)}
.codebox pre{margin:0;padding:44px 18px 18px;background:#07111f;color:#e5f0ff;overflow:auto;font-family:"JetBrains Mono","Consolas",monospace;font-size:.92rem;line-height:1.55}
.codebox code{font-family:inherit}
.copy-btn{position:absolute;top:10px;right:10px;border:1px solid #355985;background:#f59e0b;color:#111827;border-radius:999px;padding:6px 12px;font-weight:800;cursor:pointer;font-size:.78rem}
.copy-btn.copied{background:#22c55e;color:#052e16}


/* Estrutura premium do módulo 99 Exercícios */
#mod-exercicios article.chapter{
  min-height:auto !important;
  padding:24px !important;
}
#mod-exercicios .exercise-home.hidden{
  display:none !important;
}
#mod-exercicios .exercise-chapter-view{
  display:none;
}
#mod-exercicios .exercise-chapter-view.active{
  display:block;
}
#mod-exercicios .exercise-inner-card{
  background:#fff;
  border:1px solid #dbe7ff;
  border-radius:24px;
  padding:22px;
  box-shadow:0 8px 24px rgba(15,23,42,.06);
}
#mod-exercicios .exercise-back.inside-card{
  margin-top:0 !important;
  margin-bottom:18px !important;
}