/* ============================================================
   FORMAÇÃO SÊNIOR — Engenharia & Arquitetura de Software
   ============================================================
   Estilo: editorial técnico, denso mas legível.
   Tema: Dracula oficial (draculatheme.com).
   Fonte: Inter (corpo) + JetBrains Mono (código/labels).
   ============================================================
   Sumário:
     1. Tokens (variáveis CSS)
     2. Reset e tipografia base
     3. Layout (container, section)
     4. Header e navegação
     5. Hero (página principal)
     6. Pills (pilares)
     7. Roadmap (lista de fases)
     8. Princípios, linguagens, método (página principal)
     9. Página de módulo (hero, meta, abas, conteúdo)
    10. Página de conceito (prose longa, callouts, lang-compare)
    11. Referências bibliográficas
    12. Navegação prev/next
    13. Footer
    14. Animações e seleção
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ============================================================
   1. TOKENS — paleta Dracula oficial + dimensões
   ============================================================ */

:root {
  /* ----- Backgrounds (Dracula) ----- */
  --bg:       #282a36;   /* Background — base do tema */
  --bg-1:     #21222c;   /* sidebars / áreas mais escuras */
  --bg-2:     #2d2f3a;   /* tabs / hover sutil */
  --bg-3:     #44475a;   /* Current Line — destaque mais forte */
  --bg-card:  #21222c;   /* cards e blocos de conteúdo */

  /* ----- Linhas e divisórias ----- */
  --line:      #44475a;
  --line-2:    #4a4d63;
  --line-3:    #6272a4;

  /* ----- Texto ----- */
  --fg:        #f8f8f2;   /* Foreground oficial Dracula */
  --fg-1:      #f8f8f2;
  --fg-2:      #d8d8d2;
  --fg-3:      #b8b8b2;
  --fg-mute:   #6272a4;   /* Comment color — texto secundário */
  --fg-dim:    #545777;
  --fg-faint:  #44475a;

  /* ----- Cores temáticas (Dracula oficial) ----- */
  /* Mantém os mesmos nomes de variáveis usados pelo HTML
     para não quebrar referências, mas com valores Dracula. */
  --c-amber:   #bd93f9;   /* purple — acento principal */
  --c-yellow:  #f1fa8c;   /* yellow — Legibilidade */
  --c-green:   #50fa7b;   /* green — Bancos, Segurança */
  --c-coral:   #ff5555;   /* red — Concorrência, Observabilidade */
  --c-blue:    #8be9fd;   /* cyan — Escalabilidade */
  --c-purple:  #ff79c6;   /* pink — Resiliência, Disponibilidade */
  --c-cyan:    #8be9fd;   /* cyan — Custo, Go */
  --c-magenta: #ff79c6;   /* pink — C# */
  --c-azul:    #bd93f9;   /* purple — Python */
  --c-orange:  #ffb86c;   /* orange — Performance */

  --accent:    var(--c-amber);

  /* ----- Tipografia ----- */
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;

  /* ----- Layout ----- */
  --max-w:      1280px;
  --max-text:   980px;    /* largura confortável para parágrafos longos */
  --gutter:     clamp(1.25rem, 3.5vw, 2rem);
}

/* ============================================================
   2. RESET E TIPOGRAFIA BASE
   ============================================================ */

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg-1);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5 {
  color: var(--fg);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

h2 {
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 700;
  letter-spacing: -0.025em;
}

h3 { font-size: 20px; font-weight: 700; letter-spacing: -0.015em; }
h4 { font-size: 16px; font-weight: 600; }

p {
  color: var(--fg-2);
  font-size: 15px;
  line-height: 1.75;
  margin-bottom: 1rem;
}

p:last-child { margin-bottom: 0; }

.lead {
  color: var(--fg-1);
  font-size: 16px;
  line-height: 1.7;
  max-width: var(--max-text);
  font-weight: 400;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}
a:hover { border-bottom-color: currentColor; }

em { font-style: italic; color: var(--fg); }
strong { font-weight: 600; color: var(--fg); }

/* Code inline */
code, .mono {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-1);
  color: var(--c-amber);
  padding: 0.1em 0.4em;
  border-radius: 3px;
  border: 1px solid var(--line);
}

/* Blocos de código */
pre {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  border-radius: 4px;
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
}

pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: var(--fg-1);
  font-size: inherit;
}

/* Labels técnicos (eyebrow, ptag, etc) */
.label, .eyebrow {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  font-weight: 700;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: currentColor;
}

/* ============================================================
   3. LAYOUT
   ============================================================ */

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.container-text {
  max-width: var(--max-text);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section { padding: clamp(3rem, 6vh, 5rem) 0; }

/* ============================================================
   4. HEADER E NAVEGAÇÃO
   ============================================================ */

.site-header {
  border-bottom: 1px solid var(--line);
  padding: 28px 0;
  background: linear-gradient(180deg, #21222c 0%, #282a36 100%);
}

.site-header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.brand-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}

.brand-eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.brand-title {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--fg);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.6rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
}

.nav-links a {
  color: var(--fg-mute);
  border-bottom: none;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--fg); }

@media (max-width: 720px) {
  .nav-links { gap: 1rem; }
}

/* ============================================================
   5. HERO (página principal)
   ============================================================ */

.hero {
  padding: clamp(2rem, 5vh, 3rem) 0 clamp(2.5rem, 6vh, 4rem);
}

.hero h1 { margin-bottom: 1rem; }

.hero h1 .accent { color: var(--accent); }
.hero h1 .dim { color: var(--fg-mute); font-weight: 700; }

.hero-stats {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-mute);
  margin-top: 1.5rem;
  letter-spacing: 0.02em;
}

.hero-stats span { color: var(--fg-2); }

.hero-sub {
  margin-top: 1.5rem;
  max-width: 720px;
  font-size: 16px;
  color: var(--fg-2);
  line-height: 1.7;
}

.hero-sub .csharp { color: var(--c-magenta); font-weight: 500; }
.hero-sub .python { color: var(--c-azul); font-weight: 500; }
.hero-sub .go     { color: var(--c-cyan); font-weight: 500; }

/* ============================================================
   6. PILLS (pilares de qualidade)
   ============================================================ */

.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.pill {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 4px 10px;
  border-radius: 3px;
  background: rgba(189, 147, 249, 0.12);
  border: 1px solid rgba(189, 147, 249, 0.3);
  color: var(--c-amber);
  white-space: nowrap;
}

.pill[data-pillar="Qualidade"] {
  background: rgba(189, 147, 249, 0.12);
  border-color: rgba(189, 147, 249, 0.3);
  color: var(--c-amber);
}
.pill[data-pillar="Legibilidade"] {
  background: rgba(241, 250, 140, 0.12);
  border-color: rgba(241, 250, 140, 0.3);
  color: var(--c-yellow);
}
.pill[data-pillar="Disponibilidade"] {
  background: rgba(255, 121, 198, 0.12);
  border-color: rgba(255, 121, 198, 0.3);
  color: var(--c-purple);
}
.pill[data-pillar="Escalabilidade"] {
  background: rgba(139, 233, 253, 0.12);
  border-color: rgba(139, 233, 253, 0.3);
  color: var(--c-blue);
}
.pill[data-pillar="Observabilidade"] {
  background: rgba(255, 85, 85, 0.12);
  border-color: rgba(255, 85, 85, 0.3);
  color: var(--c-coral);
}
.pill[data-pillar="Segurança"] {
  background: rgba(80, 250, 123, 0.12);
  border-color: rgba(80, 250, 123, 0.3);
  color: var(--c-green);
}
.pill[data-pillar="Performance"] {
  background: rgba(255, 184, 108, 0.12);
  border-color: rgba(255, 184, 108, 0.3);
  color: var(--c-orange);
}
.pill[data-pillar="Custo"] {
  background: rgba(139, 233, 253, 0.12);
  border-color: rgba(139, 233, 253, 0.3);
  color: var(--c-cyan);
}
.pill[data-pillar="Confiabilidade"] {
  background: rgba(255, 121, 198, 0.12);
  border-color: rgba(255, 121, 198, 0.3);
  color: var(--c-purple);
}
.pill[data-pillar="Operação"] {
  background: rgba(98, 114, 164, 0.15);
  border-color: rgba(98, 114, 164, 0.35);
  color: var(--fg-mute);
}

/* ============================================================
   7. ROADMAP — lista de fases (página principal)
   ============================================================ */

.roadmap {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 2rem;
  border-top: 1px solid var(--line);
}

.phase-card {
  display: grid;
  grid-template-columns: 60px 28px 1fr auto;
  gap: 1.5rem;
  align-items: center;
  padding: 1.4rem var(--gutter) 1.4rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  border-left: 2px solid transparent;
  padding-left: var(--gutter);
  transition: background 0.2s, border-left-color 0.2s, padding-left 0.2s;
}

.phase-card:hover {
  background: var(--bg-2);
  border-left-color: var(--phase-color, var(--accent));
  padding-left: calc(var(--gutter) + 4px);
  border-bottom-color: var(--line);
}

.phase-card .pn {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--fg-dim);
  letter-spacing: 0.05em;
}

.phase-card .pi {
  font-size: 16px;
  color: var(--phase-color, var(--accent));
  text-align: center;
}

.phase-card .pb { min-width: 0; }

.phase-card .pb h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 4px;
  letter-spacing: -0.01em;
}

.phase-card .pb .ps {
  font-size: 13px;
  color: var(--fg-mute);
  margin-bottom: 8px;
  font-weight: 400;
  font-style: italic;
}

.phase-card .pb .pmeta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-dim);
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.phase-card .pb .pmeta strong {
  color: var(--phase-color, var(--accent));
  font-weight: 600;
}

.phase-card .pa {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-dim);
  text-align: right;
}

.phase-card.locked { opacity: 0.45; pointer-events: none; }
.phase-card.locked .pa::before { content: 'em breve'; }
.phase-card:not(.locked) .pa::before { content: 'abrir →'; }

@media (max-width: 720px) {
  .phase-card { grid-template-columns: 40px 24px 1fr; gap: 0.8rem; padding-left: var(--gutter); }
  .phase-card .pa { display: none; }
  .phase-card .pb h3 { font-size: 15px; }
}

/* ============================================================
   8. PRINCÍPIOS, LINGUAGENS, MÉTODO (página principal)
   ============================================================ */

/* Princípios */
.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px;
  margin-top: 2rem;
  background: var(--line);
  border: 1px solid var(--line);
}

.principle {
  background: var(--bg);
  padding: 1.4rem 1.4rem;
}

.principle .pnum {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--accent);
  font-weight: 700;
  display: block;
  margin-bottom: 8px;
}

.principle h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.principle p {
  font-size: 13px;
  color: var(--fg-3);
  line-height: 1.65;
  margin: 0;
}

/* Linguagens */
.languages-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 2rem;
  background: var(--line);
  border: 1px solid var(--line);
}

.lang {
  background: var(--bg);
  padding: 1.6rem 1.4rem;
}

.lang .lname {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  display: block;
  margin-bottom: 6px;
}

.lang.csharp .lname { color: var(--c-magenta); }
.lang.python .lname { color: var(--c-azul); }
.lang.go     .lname { color: var(--c-cyan); }

.lang .ldesc {
  font-size: 13px;
  color: var(--fg-3);
  line-height: 1.6;
}

@media (max-width: 720px) {
  .languages-row { grid-template-columns: 1fr; }
}

/* Método */
.method-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.6rem;
  margin-top: 2rem;
}

.step {
  border-left: 1px solid var(--line-2);
  padding: 4px 0 4px 1.2rem;
}

.step .sn {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--accent);
  font-weight: 700;
  display: block;
  margin-bottom: 8px;
}

.step h4 {
  font-size: 15px;
  margin-bottom: 6px;
}

.step p {
  font-size: 13px;
  color: var(--fg-3);
  margin: 0;
  line-height: 1.65;
}

/* ============================================================
   9. PÁGINA DE MÓDULO
   ============================================================ */

.module-hero {
  padding: clamp(2rem, 5vh, 3.5rem) 0 clamp(1.5rem, 4vh, 2.5rem);
  border-bottom: 1px solid var(--line);
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  margin-bottom: 1.5rem;
  letter-spacing: 0.04em;
}

.breadcrumb a { color: var(--fg-mute); border-bottom: none; }
.breadcrumb a:hover { color: var(--fg-2); }
.breadcrumb .sep { margin: 0 0.5rem; color: var(--fg-faint); }

.module-tag {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 1rem;
}

.module-tag .icon { font-size: 18px; }
.module-tag::before {
  content: '';
  width: 24px;
  height: 1px;
  background: currentColor;
}

.module-hero h1 .accent { color: var(--accent); }
.module-hero h1 .dim { color: var(--fg-mute); font-weight: 700; }

.module-subtitle {
  font-size: 17px;
  color: var(--fg-3);
  font-weight: 300;
  margin-top: 1rem;
  max-width: 60ch;
  line-height: 1.6;
}

.module-meta {
  margin-top: 1.8rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1.2rem 2rem;
}

.module-meta .item .k {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--fg-dim);
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
}

.module-meta .item .v {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--fg);
}

.module-pills { margin-top: 1.2rem; }

/* Abas do módulo */
.tabs-nav {
  display: flex;
  gap: 4px;
  margin: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-bottom: none;
  border-radius: 4px 4px 0 0;
  padding: 0.6rem 1rem;
  margin-bottom: -1px;
  color: var(--fg-mute);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  transition: color 0.15s, background 0.15s;
  display: flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
}

.tab-btn:hover { color: var(--fg-2); }

.tab-btn.active {
  color: var(--accent);
  background: var(--bg);
  border-color: var(--line-2);
  border-bottom-color: var(--bg);
}

.tab-btn .count {
  font-size: 10px;
  background: var(--bg-3);
  color: var(--fg-3);
  padding: 1px 6px;
  border-radius: 2px;
  font-weight: 600;
}

.tab-btn.active .count {
  color: var(--accent);
  background: rgba(189, 147, 249, 0.15);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.25s ease; }

.tab-intro {
  font-size: 14px;
  color: var(--fg-3);
  margin-bottom: 1.8rem;
  font-style: italic;
  max-width: var(--max-text);
  line-height: 1.7;
}

/* Lista de conceitos (cards clicáveis) */
.concepts-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}

.concept-card {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  gap: 1.2rem;
  align-items: center;
  padding: 1.2rem 1.4rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s, padding-left 0.15s;
}

.concept-card:last-child { border-bottom: none; }

.concept-card:hover {
  background: var(--bg-2);
  padding-left: 1.6rem;
}

.concept-card:hover h4 { color: var(--accent); }

.concept-card .cn {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.concept-card h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 4px;
  letter-spacing: -0.01em;
  transition: color 0.15s;
}

.concept-card p {
  font-size: 13px;
  color: var(--fg-3);
  line-height: 1.65;
  margin: 0;
}

.concept-card .ca {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-dim);
}

@media (max-width: 720px) {
  .concept-card { grid-template-columns: 32px 1fr; }
  .concept-card .ca { display: none; }
}

/* Decisões */
.decisions-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.decision {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  padding: 1.2rem 1.4rem;
  border-radius: 4px;
}

.decision .q {
  font-size: 14px;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 0.6rem;
  letter-spacing: -0.005em;
}

.decision .a {
  font-size: 14px;
  color: var(--fg-2);
  line-height: 1.7;
  margin: 0;
}

/* Projeto */
.project-block {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1.6rem 1.6rem 1.4rem;
  margin-bottom: 1rem;
}

.project-block .ptag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.25em;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.8rem;
  display: block;
}

.project-block h3 {
  font-size: 20px;
  margin-bottom: 0.8rem;
  font-weight: 800;
  letter-spacing: -0.015em;
}

.project-block .pdesc {
  font-size: 14px;
  color: var(--fg-2);
  line-height: 1.75;
  margin-bottom: 1.4rem;
}

.requirements-block { margin-bottom: 1.4rem; }

.requirements-block .rlabel {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.25em;
  color: var(--fg-dim);
  font-weight: 700;
  display: block;
  margin-bottom: 8px;
}

.requirements-block ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.requirements-block li {
  font-size: 13px;
  color: var(--fg-2);
  line-height: 1.7;
  display: flex;
  gap: 10px;
  padding: 2px 0;
}

.requirements-block li::before {
  content: '›';
  color: var(--accent);
  flex-shrink: 0;
  font-weight: 700;
}

/* Stack tabs por linguagem (no projeto) */
.stacks-tabs-nav {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.25em;
  color: var(--fg-dim);
  font-weight: 700;
  margin: 1.5rem 0 0.8rem;
  text-transform: uppercase;
}

.stacks-langs {
  display: flex;
  gap: 8px;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.lang-btn {
  background: transparent;
  border: 1px solid var(--line-2);
  border-radius: 4px;
  padding: 6px 14px;
  color: var(--fg-mute);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  transition: all 0.15s;
}

.lang-btn:hover { color: var(--fg-2); border-color: var(--line-3); }

.lang-btn.active {
  border-color: currentColor;
  font-weight: 700;
}

.lang-btn[data-lang="csharp"].active { background: rgba(255, 121, 198, 0.12); color: var(--c-magenta); }
.lang-btn[data-lang="python"].active { background: rgba(189, 147, 249, 0.12); color: var(--c-azul); }
.lang-btn[data-lang="go"].active     { background: rgba(139, 233, 253, 0.12); color: var(--c-cyan); }

.stack-panel {
  background: var(--bg-1);
  border: 1px solid var(--line-2);
  border-radius: 4px;
  padding: 1.2rem 1.4rem;
  display: none;
}

.stack-panel.active { display: block; }

.stack-panel .slabel {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.25em;
  color: var(--fg-dim);
  font-weight: 700;
  display: block;
  margin-bottom: 6px;
}

.stack-panel .stxt {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg-1);
  margin-bottom: 1rem;
}

.stack-panel ul {
  list-style: none;
  padding: 0;
}

.stack-panel li {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-2);
  line-height: 1.8;
  display: flex;
  gap: 8px;
}

.stack-panel li::before {
  content: '·';
  color: var(--fg-mute);
}

/* Entrevista */
.interview-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}

.interview-q {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 1rem;
  padding: 1.1rem 1.4rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.interview-q:last-child { border-bottom: none; }

.interview-q .qn {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  font-weight: 700;
}

.interview-q .qt {
  font-size: 14px;
  color: var(--fg-1);
  line-height: 1.7;
  margin: 0;
}

/* ============================================================
   10. PÁGINA DE CONCEITO (prose longa)
   ============================================================ */

.concept-hero {
  padding: clamp(1.5rem, 4vh, 2.5rem) 0 clamp(1.2rem, 3vh, 2rem);
  border-bottom: 1px solid var(--line);
  margin-bottom: 2.5rem;
}

.concept-hero .module-tag { margin-bottom: 0.8rem; }

.concept-hero h1 {
  font-size: clamp(24px, 3.4vw, 36px);
  margin-bottom: 0.6rem;
}

.concept-hero h1 .accent { color: var(--accent); }

.concept-hero .csub {
  font-size: 16px;
  color: var(--fg-3);
  font-weight: 300;
  line-height: 1.6;
  max-width: 80ch;
}

.concept-meta {
  margin-top: 1.2rem;
  display: flex;
  gap: 2rem;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  flex-wrap: wrap;
}

.concept-meta strong { color: var(--fg-2); font-weight: 600; }

/* Prose: container largo, parágrafos legíveis */
.prose {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* Parágrafos, listas e quotes ficam no max-text para leitura confortável */
.prose p,
.prose ul,
.prose ol,
.prose blockquote {
  max-width: var(--max-text);
}

.prose p {
  font-size: 16px;
  color: var(--fg-1);
  line-height: 1.8;
  margin-bottom: 1.4rem;
}

/* Headings, blocos visuais e referências usam toda a largura */
.prose h2,
.prose h3,
.prose h4,
.prose .callout,
.prose pre,
.prose .lang-compare,
.prose .refs,
.prose .nav-prev-next {
  max-width: 100%;
}

.prose h2 {
  font-size: 24px;
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--line);
}

.prose h3 {
  font-size: 18px;
  margin-top: 2.2rem;
  margin-bottom: 0.8rem;
  color: var(--accent);
}

.prose h4 {
  font-size: 15px;
  margin-top: 1.8rem;
  margin-bottom: 0.6rem;
  color: var(--fg);
}

.prose ul, .prose ol {
  margin: 1rem 0 1.4rem 1.4rem;
  padding-left: 0.5rem;
}

.prose li {
  font-size: 16px;
  color: var(--fg-1);
  line-height: 1.75;
  margin-bottom: 0.5rem;
}

.prose li::marker { color: var(--fg-dim); }

.prose blockquote {
  border-left: 2px solid var(--accent);
  padding: 0.4rem 0 0.4rem 1.2rem;
  margin: 1.6rem 0;
  font-style: italic;
  color: var(--fg-2);
}

.prose blockquote p { font-size: 15px; margin-bottom: 0.6rem; }
.prose blockquote .src {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  font-style: normal;
}

/* Callouts (princípio, armadilha, heurística) */
.callout {
  background: var(--bg-1);
  border: 1px solid var(--line-2);
  border-left: 2px solid var(--accent);
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
  border-radius: 0 4px 4px 0;
}

.callout .clabel {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.25em;
  color: var(--accent);
  font-weight: 700;
  display: block;
  margin-bottom: 6px;
  text-transform: uppercase;
}

.callout p { font-size: 14px; color: var(--fg-2); margin: 0; }
.callout p + p { margin-top: 0.6rem; }

.callout.warn { border-left-color: var(--c-coral); }
.callout.warn .clabel { color: var(--c-coral); }

.callout.tip { border-left-color: var(--c-green); }
.callout.tip .clabel { color: var(--c-green); }

/* Lang-compare: carrossel de exemplos por linguagem (montado pelo JS) */
.lang-compare {
  margin: 1.8rem 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  background: var(--bg-card);
}

.lang-compare-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--line);
  background: var(--bg-1);
}

.lang-compare-tab {
  flex: 1;
  background: transparent;
  border: none;
  border-right: 1px solid var(--line);
  padding: 0.7rem 1rem;
  color: var(--fg-mute);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: background 0.15s, color 0.15s;
  text-align: center;
}

.lang-compare-tab:last-child { border-right: none; }
.lang-compare-tab:hover { color: var(--fg-2); background: var(--bg-2); }

.lang-compare-tab.active {
  background: var(--bg-card);
  color: var(--fg);
  font-weight: 700;
}

.lang-compare-tab[data-lc-lang="csharp"].active { color: var(--c-magenta); }
.lang-compare-tab[data-lc-lang="python"].active { color: var(--c-azul); }
.lang-compare-tab[data-lc-lang="go"].active     { color: var(--c-cyan); }

.lc {
  display: none;
  padding: 1.2rem 1.4rem;
}

.lc.active { display: block; }

.lc .lc-name { display: none; }

.lc pre {
  margin: 0 0 0.8rem;
  padding: 0.9rem 1rem;
  background: var(--bg);
  border-left: none;
  font-size: 12.5px;
  line-height: 1.55;
  border: 1px solid var(--line-2);
  border-radius: 3px;
}

.lc pre code {
  white-space: pre;
  word-wrap: normal;
}

.lc .lc-note {
  font-size: 13px;
  color: var(--fg-3);
  line-height: 1.65;
  margin: 0.6rem 0 0;
}

/* ============================================================
   11. REFERÊNCIAS BIBLIOGRÁFICAS
   ============================================================ */

.refs {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.refs h2 {
  font-size: 18px;
  margin-bottom: 1rem;
  border: none;
  padding: 0;
}

.refs-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.refs-list li {
  font-size: 13px;
  color: var(--fg-2);
  line-height: 1.6;
  padding-left: 1.6rem;
  position: relative;
  margin-bottom: 0;
}

.refs-list li::before {
  content: counter(list-item) '.';
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  position: absolute;
  left: 0;
  top: 2px;
}

.refs-list li strong { color: var(--fg-1); font-weight: 600; }

.refs-list li .rmeta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  display: block;
  margin-top: 2px;
}

.refs-list li .rtype {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 2px;
  margin-right: 6px;
}

.refs-list li .rtype.book    { background: rgba(189, 147, 249, 0.15); color: var(--c-amber); }
.refs-list li .rtype.article { background: rgba(80, 250, 123, 0.15); color: var(--c-green); }
.refs-list li .rtype.docs    { background: rgba(139, 233, 253, 0.15); color: var(--c-blue); }
.refs-list li .rtype.video   { background: rgba(255, 85, 85, 0.15); color: var(--c-coral); }
.refs-list li .rtype.paper   { background: rgba(255, 121, 198, 0.15); color: var(--c-purple); }

/* ============================================================
   12. NAVEGAÇÃO PREV/NEXT
   ============================================================ */

.nav-prev-next {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin-top: 3rem;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}

.nav-prev-next a {
  display: block;
  padding: 1.2rem 1.4rem;
  background: var(--bg-card);
  text-decoration: none;
  border-bottom: none;
  transition: background 0.15s;
}

.nav-prev-next a:hover { background: var(--bg-2); }

.nav-prev-next .nplabel {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--fg-dim);
  font-weight: 700;
  display: block;
  margin-bottom: 6px;
  text-transform: uppercase;
}

.nav-prev-next .nptitle {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg);
}

.nav-prev-next .next { text-align: right; }

@media (max-width: 720px) {
  .nav-prev-next { grid-template-columns: 1fr; }
  .nav-prev-next .next { text-align: left; }
}

/* ============================================================
   13. FOOTER
   ============================================================ */

footer {
  border-top: 1px solid var(--line);
  padding: 2.5rem 0;
  margin-top: 4rem;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  flex-wrap: wrap;
  gap: 1rem;
}

/* ============================================================
   14. ANIMAÇÕES E SELEÇÃO
   ============================================================ */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

::selection {
  background: rgba(189, 147, 249, 0.35);
  color: var(--fg);
}

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--line); }
::-webkit-scrollbar-thumb:hover { background: var(--line-3); }