/* ═══════════════════════════════════════════════════════
   NÚCLEO — Design System v2
   Centro de Documentação e Inteligência Coletiva
   IA na Educação
   ═══════════════════════════════════════════════════════ */

/* ── RESET & BASE ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  color:var(--body);background:var(--canvas);line-height:1.6;font-size:15px;
  min-height:100vh;
}
a{color:var(--info);text-decoration:none;transition:color .15s}
a:hover{color:var(--info-hover)}
img{max-width:100%;height:auto}

/* ── TOKENS ── */
:root{
  /* Palette — Slate + Blue + Emerald */
  --canvas:#f1f5f9;--canvas-alt:#f8fafc;
  --surface:#ffffff;--surface-raised:#ffffff;
  --surface-soft:#f1f5f9;--surface-strong:#e2e8f0;
  --surface-dark:#0f172a;--surface-dark-soft:#1e293b;

  --ink:#0f172a;--body:#334155;--muted:#64748b;
  --hairline:#e2e8f0;--hairline-strong:#cbd5e1;

  --primary:#1d4ed8;--primary-hover:#1e40af;--primary-soft:#dbeafe;--primary-active:#1d4ed8;
  --on-primary:#ffffff;

  --accent:#059669;--accent-hover:#047857;--accent-soft:#d1fae5;
  --accent2:#7c3aed;--accent2-soft:#ede9fe;

  --info:#3b82f6;--info-hover:#2563eb;--info-soft:#eff6ff;
  --info-ring:rgba(59,130,246,0.15);

  --success:#059669;--success-soft:#ecfdf5;--success-border:#a7f3d0;
  --warning:#d97706;--warning-soft:#fffbeb;--warning-border:#fde68a;
  --danger:#dc2626;--danger-soft:#fef2f2;--danger-border:#fecaca;
  --danger-hover:#b91c1c;

  /* Radius */
  --r-xs:4px;--r-sm:6px;--r-md:10px;--r-lg:14px;--r-xl:20px;--r-pill:9999px;

  /* Shadows */
  --shadow-sm:0 1px 2px rgba(0,0,0,.05);
  --shadow-md:0 4px 6px -1px rgba(0,0,0,.06),0 2px 4px -2px rgba(0,0,0,.04);
  --shadow-lg:0 10px 15px -3px rgba(0,0,0,.06),0 4px 6px -4px rgba(0,0,0,.04);
  --shadow-xl:0 20px 25px -5px rgba(0,0,0,.08),0 8px 10px -6px rgba(0,0,0,.04);
  --shadow-glow:0 0 0 4px var(--info-ring);

  /* Transitions */
  --ts:0.15s ease;--tm:0.25s ease;--tl:0.35s cubic-bezier(.4,0,.2,1);
}

/* ── TYPOGRAPHY ── */
h1,h2,h3,h4{color:var(--ink);font-weight:600;line-height:1.25;letter-spacing:-.01em}
h1{font-size:2rem;margin-bottom:.5rem}
h2{font-size:1.5rem;margin-bottom:.375rem}
h3{font-size:1.125rem;margin-bottom:.25rem}
.text-sm{font-size:.8125rem}
.text-xs{font-size:.75rem}
.text-muted{color:var(--muted)}
.text-ink{color:var(--ink)}
.text-success{color:var(--success)}
.text-danger{color:var(--danger)}
.text-warning{color:var(--warning)}
.font-mono{font-family:'JetBrains Mono','Fira Code',ui-monospace,monospace;font-size:.875rem}

/* ── LAYOUT ── */
.container{max-width:1280px;margin:0 auto;padding:0 24px}
.flex{display:flex}
.flex-col{flex-direction:column}
.flex-wrap{flex-wrap:wrap}
.flex-between{display:flex;align-items:center;justify-content:space-between}
.flex-center{display:flex;align-items:center;justify-content:center}
.items-center{align-items:center}
.justify-between{justify-content:space-between}
.gap-xs{gap:4px}.gap-sm{gap:8px}.gap-md{gap:16px}.gap-lg{gap:24px}.gap-xl{gap:32px}
.mt-sm{margin-top:8px}.mt-md{margin-top:16px}.mt-lg{margin-top:24px}.mt-xl{margin-top:32px}
.mb-sm{margin-bottom:8px}.mb-md{margin-bottom:16px}.mb-lg{margin-bottom:24px}.mb-xl{margin-bottom:32px}
.text-center{text-align:center}.text-right{text-align:right}
.truncate{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hidden{display:none}

/* ── BUTTONS ── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:9px 18px;border-radius:var(--r-md);font-size:14px;font-weight:500;
  cursor:pointer;border:1px solid transparent;transition:all var(--ts);
  line-height:1.4;white-space:nowrap;text-decoration:none;font-family:inherit;
}
.btn:active{transform:scale(.98)}
.btn-primary{background:var(--primary);color:var(--on-primary)}
.btn-primary:hover{background:var(--primary-hover);color:var(--on-primary)}
.btn-primary:focus-visible{box-shadow:0 0 0 3px rgba(29,78,216,.25)}
.btn-outline{background:var(--surface);color:var(--ink);border:1px solid var(--hairline-strong)}
.btn-outline:hover{background:var(--surface-soft);border-color:var(--muted)}
.btn-ghost{background:transparent;color:var(--body)}
.btn-ghost:hover{background:var(--surface-soft);color:var(--ink)}
.btn-danger{background:var(--danger);color:white}
.btn-danger:hover{background:var(--danger-hover)}
.btn-success{background:var(--success);color:white}
.btn-success:hover{background:var(--accent-hover)}
.btn-sm{padding:5px 12px;font-size:13px;border-radius:var(--r-sm)}
.btn-xs{padding:3px 8px;font-size:12px;border-radius:var(--r-xs)}
.btn-lg{padding:12px 24px;font-size:16px;border-radius:var(--r-lg)}
.btn-icon{padding:8px;width:36px;height:36px}
.btn:disabled,.btn[disabled]{opacity:.5;pointer-events:none}

/* ── CARDS ── */
.card{
  background:var(--surface);border-radius:var(--r-lg);
  border:1px solid var(--hairline);padding:24px;
  transition:box-shadow var(--ts);
}
.card:hover{box-shadow:var(--shadow-md)}
.card-hover{cursor:pointer}
.card-header{padding-bottom:16px;margin-bottom:16px;border-bottom:1px solid var(--hairline)}
.card-title{font-size:1rem;font-weight:600;color:var(--ink)}
.card-meta{font-size:.8125rem;color:var(--muted);margin-top:4px}

/* ── STAT CARDS ── */
.stat-card{background:var(--surface);border-radius:var(--r-lg);border:1px solid var(--hairline);padding:20px 24px;transition:all var(--ts)}
.stat-card:hover{box-shadow:var(--shadow-md);border-color:var(--hairline-strong)}
.stat-value{font-size:2rem;font-weight:700;color:var(--ink);line-height:1.1}
.stat-label{font-size:.8125rem;color:var(--muted);margin-top:4px;text-transform:uppercase;letter-spacing:.5px}
.stat-icon{width:40px;height:40px;border-radius:var(--r-md);display:flex;align-items:center;justify-content:center;font-size:1.25rem}
.stat-icon-blue{background:var(--primary-soft);color:var(--primary)}
.stat-icon-green{background:var(--accent-soft);color:var(--accent)}
.stat-icon-purple{background:var(--accent2-soft);color:var(--accent2)}

/* ── BADGES ── */
.badge{
  display:inline-flex;align-items:center;gap:4px;
  padding:2px 10px;border-radius:var(--r-pill);
  font-size:12px;font-weight:500;line-height:1.6;
}
.badge-blue{background:var(--primary-soft);color:var(--primary)}
.badge-green{background:var(--accent-soft);color:var(--accent)}
.badge-red{background:var(--danger-soft);color:var(--danger)}
.badge-yellow{background:var(--warning-soft);color:var(--warning)}
.badge-purple{background:var(--accent2-soft);color:var(--accent2)}
.badge-slate{background:var(--surface-strong);color:var(--muted)}

/* ── TAGS ── */
.tag{
  display:inline-flex;align-items:center;gap:4px;
  padding:4px 12px;border-radius:var(--r-pill);
  font-size:13px;font-weight:500;border:1px solid var(--hairline);
  background:var(--surface);color:var(--body);transition:all var(--ts);
  text-decoration:none;
}
.tag:hover{background:var(--surface-soft);border-color:var(--muted);color:var(--ink)}
.tag-active{background:var(--primary-soft);border-color:var(--primary);color:var(--primary);font-weight:600}

/* ── FORMS ── */
.form-group{margin-bottom:20px}
.form-label{display:block;font-weight:500;font-size:13px;margin-bottom:6px;color:var(--ink);text-transform:uppercase;letter-spacing:.3px}
.form-label .required{color:var(--danger)}
.form-hint{font-size:12px;color:var(--muted);margin-top:4px}
.form-input,.form-select,.form-textarea{
  width:100%;padding:10px 14px;border:1px solid var(--hairline);
  border-radius:var(--r-md);font-size:14px;font-family:inherit;line-height:1.5;
  color:var(--ink);background:var(--surface);transition:all var(--ts);
}
.form-input:focus,.form-select:focus,.form-textarea:focus{
  outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(29,78,216,.1);
  background:var(--surface);
}
.form-input::placeholder{color:var(--muted)}
.form-textarea{min-height:120px;resize:vertical;line-height:1.7}
.form-select{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}
.form-checkbox,.form-radio{width:18px;height:18px;accent-color:var(--primary);cursor:pointer}
.form-inline{display:flex;align-items:center;gap:12px}

/* ── TABLES ── */
.table-wrapper{overflow-x:auto;border-radius:var(--r-lg);border:1px solid var(--hairline)}
table.nucleo-table{width:100%;border-collapse:collapse;font-size:14px}
table.nucleo-table th,table.nucleo-table td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--hairline)}
table.nucleo-table th{font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.3px;color:var(--muted);background:var(--surface-soft);position:sticky;top:0}
table.nucleo-table tr:last-child td{border-bottom:none}
table.nucleo-table tr:hover td{background:var(--surface-soft)}
table.nucleo-table td .cell-title{font-weight:500;color:var(--ink)}
table.nucleo-table td .cell-meta{font-size:12px;color:var(--muted);margin-top:2px}

/* ── FLASH MESSAGES ── */
.flash{
  padding:12px 16px;border-radius:var(--r-md);font-size:14px;margin-bottom:16px;
  display:flex;align-items:center;gap:10px;animation:slideDown var(--tl);
}
@keyframes slideDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
.flash-success{background:var(--success-soft);color:var(--success);border:1px solid var(--success-border)}
.flash-error{background:var(--danger-soft);color:var(--danger);border:1px solid var(--danger-border)}
.flash-info{background:var(--info-soft);color:var(--info);border:1px solid #bfdbfe}
.flash-warning{background:var(--warning-soft);color:var(--warning);border:1px solid var(--warning-border)}

/* ── PAGE HEADER ── */
.page-header{padding:32px 0;display:flex;align-items:flex-start;justify-content:space-between;flex-wrap:wrap;gap:16px}
.page-header h1{font-size:1.75rem;font-weight:700;color:var(--ink);line-height:1.2}
.page-header p{color:var(--muted);font-size:15px;margin-top:4px}
.page-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}

/* ── EMPTY STATE ── */
.empty-state{text-align:center;padding:64px 24px}
.empty-state .empty-icon{font-size:48px;margin-bottom:16px;opacity:.4}
.empty-state h3{font-size:18px;color:var(--ink);margin-bottom:8px}
.empty-state p{color:var(--muted);font-size:14px;max-width:420px;margin:0 auto 20px}

/* ── GRID LAYOUTS ── */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.grid-auto{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}

/* ── SKELETON LOADING ── */
.skeleton{background:linear-gradient(90deg,var(--surface-soft) 25%,var(--hairline) 50%,var(--surface-soft) 75%);background-size:200% 100%;animation:skeleton 1.5s infinite;border-radius:var(--r-sm)}
@keyframes skeleton{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ── TOOLTIP ── */
[data-tooltip]{position:relative}
[data-tooltip]::after{
  content:attr(data-tooltip);position:absolute;bottom:100%;left:50%;transform:translateX(-50%);
  background:var(--ink);color:white;padding:4px 10px;border-radius:var(--r-xs);font-size:12px;
  white-space:nowrap;opacity:0;pointer-events:none;transition:opacity var(--ts);z-index:1000;
}
[data-tooltip]:hover::after{opacity:1}

/* ── UTILITIES ── */
.overflow-hidden{overflow:hidden}
.relative{position:relative}
.object-cover{object-fit:cover}
.w-full{width:100%}
.rounded{border-radius:var(--r-md)}
.rounded-lg{border-radius:var(--r-lg)}
.rounded-full{border-radius:var(--r-pill)}

/* ── RESPONSIVE ── */
@media(max-width:1024px){
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .grid-4{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .container{padding:0 16px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .page-header{flex-direction:column}
  h1{font-size:1.5rem}
  .flex-between-mobile{flex-direction:column;align-items:flex-start;gap:12px}
}

/* ═══════════════════════════════════════════════════════
   MARKDOWN CONTENT RENDERING
   ═══════════════════════════════════════════════════════ */
.markdown-body{color:var(--body);line-height:1.85;font-size:15px}
.markdown-body h1{font-size:1.75rem;font-weight:700;color:var(--ink);margin:1.5em 0 .5em;padding-bottom:.3em;border-bottom:2px solid var(--hairline)}
.markdown-body h1:first-child{margin-top:0}
.markdown-body h2{font-size:1.4rem;font-weight:600;color:var(--ink);margin:1.4em 0 .4em}
.markdown-body h3{font-size:1.15rem;font-weight:600;color:var(--ink);margin:1.2em 0 .3em}
.markdown-body h4{font-size:1.05rem;font-weight:600;color:var(--ink);margin:1em 0 .2em}
.markdown-body p{margin:0 0 1em}
.markdown-body p:last-child{margin-bottom:0}
.markdown-body strong{color:var(--ink);font-weight:600}
.markdown-body ul,.markdown-body ol{padding-left:1.5em;margin:0 0 1em}
.markdown-body li{margin-bottom:.35em}
.markdown-body li:last-child{margin-bottom:0}
.markdown-body blockquote{
  margin:1em 0;padding:12px 20px;
  border-left:3px solid var(--primary);background:var(--primary-soft);
  border-radius:0 var(--r-md) var(--r-md) 0;color:var(--ink);
}
.markdown-body blockquote p:last-child{margin-bottom:0}
.markdown-body code{
  background:var(--surface-soft);padding:2px 6px;border-radius:var(--r-xs);
  font-family:'JetBrains Mono','Fira Code',ui-monospace;font-size:.875em;
  color:var(--danger);border:1px solid var(--hairline);
}
.markdown-body pre{
  background:var(--surface-dark);color:#e2e8f0;padding:16px 20px;
  border-radius:var(--r-md);overflow-x:auto;margin:1em 0;
  font-family:'JetBrains Mono','Fira Code',ui-monospace;font-size:.875rem;
  line-height:1.6;
}
.markdown-body pre code{background:none;padding:0;border:none;color:inherit;font-size:inherit}
.markdown-body table{width:100%;border-collapse:collapse;margin:1em 0;font-size:.9rem}
.markdown-body th,.markdown-body td{padding:10px 14px;text-align:left;border:1px solid var(--hairline)}
.markdown-body th{background:var(--surface-soft);font-weight:600;color:var(--ink)}
.markdown-body tr:nth-child(even){background:var(--surface-soft)}
.markdown-body hr{border:none;border-top:2px solid var(--hairline);margin:2em 0}
.markdown-body a{color:var(--primary);text-decoration:underline;text-underline-offset:2px}
.markdown-body a:hover{color:var(--primary-hover)}
.markdown-body img{max-width:100%;border-radius:var(--r-md);margin:1em 0}
.markdown-body em{font-style:italic}
.markdown-body del{opacity:.6}

/* PUBLIC SITE SPECIFIC */
.public-container{max-width:900px;margin:0 auto;padding:40px 24px}
.public-container .page-header{border-left:none;padding:24px 0 40px;display:block}
.public-container .page-header h1{font-size:2.2rem;font-weight:700;line-height:1.25}
.public-container .page-description{font-size:1.1rem;color:var(--muted);margin-top:8px;max-width:700px}
.public-container .page-breadcrumb{font-size:.8rem;color:var(--muted);margin-bottom:12px;display:block}
.public-container .page-breadcrumb a{color:var(--muted)}
.public-container .page-breadcrumb a:hover{color:var(--primary)}
.public-container .page-meta{display:flex;align-items:center;gap:12px;margin-top:16px;flex-wrap:wrap}
.public-container .cards-grid{display:grid;grid-template-columns:1fr;gap:20px}

@media(max-width:768px){
  .public-container{padding:24px 16px}
  .public-container .page-header h1{font-size:1.5rem}
}