/* ==========================================================================
   DEEP WORK | PLATAFORMA INTERATIVA DE APRENDIZAGEM & IMPLEMENTAÇÃO
   Design Editorial Premium • Modo Escuro • Acessibilidade WCAG AA
   ========================================================================== */

:root {
  --color-primary-navy: #102A43;
  --color-accent-blue: #1769AA;
  --color-accent-teal: #168A83;
  --color-amber-note: #E8A23A;
  --color-bg-light: #F7F9FC;
  --color-card-bg: #FFFFFF;
  --color-border-subtle: #E2E8F0;
  --color-text-main: #243447;
  --color-text-muted: #66788A;
  --color-danger: #D9383A;
  --color-success: #1E824C;
  /* Aliases usados em algumas páginas */
  --color-bg-card: var(--color-card-bg);
  --color-bg-subtle: var(--color-bg-light);
  --color-accent-gold: var(--color-amber-note);

  /* Tipografia */
  --font-serif: "Source Serif 4", Georgia, Cambria, "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
  --font-mono: SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --font-size-base: 18px;
  --line-height-base: 1.75;
  --max-content-width: 820px;
  --sidebar-width: 300px;
  --header-height: 64px;

  /* Sombras & Transições */
  --shadow-sm: 0 1px 3px rgba(16, 42, 67, 0.06), 0 1px 2px rgba(16, 42, 67, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(16, 42, 67, 0.08), 0 2px 4px -1px rgba(16, 42, 67, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(16, 42, 67, 0.1), 0 4px 6px -2px rgba(16, 42, 67, 0.05);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --color-primary-navy: #E2E8F0;
  --color-accent-blue: #38BDF8;
  --color-accent-teal: #2DD4BF;
  --color-amber-note: #FBBF24;
  --color-bg-light: #0B131E;
  --color-card-bg: #142233;
  --color-border-subtle: #233549;
  --color-text-main: #E2E8F0;
  --color-text-muted: #94A3B8;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.5);
}

/* Reset Básico */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

/* Garante que qualquer salto por âncora do sumário respeite a barra fixa superior */
section[id],
div[id],
article[id],
main[id],
h1[id],
h2[id],
h3[id],
.chapter-hero[id],
.content-section[id],
.diagram-wrapper[id],
.callout[id] {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

/* Cartões Interativos e Clicáveis do Sumário */
.clickable-chapter-card {
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s ease, border-color 0.2s ease;
  cursor: pointer;
  position: relative;
}

.clickable-chapter-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--color-accent-blue) !important;
}

.clickable-chapter-card h3 a:hover {
  color: var(--color-accent-blue) !important;
  text-decoration: underline;
}

body {
  font-family: var(--font-serif);
  color: var(--color-text-main);
  background-color: var(--color-bg-light);
  line-height: var(--line-height-base);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Tipografia de Interface */
h1, h2, h3, h4, h5, h6, button, input, textarea, select, .nav-link, .badge, .meta-tag {
  font-family: var(--font-sans);
  letter-spacing: -0.015em;
}

h1 { font-size: 2.35rem; line-height: 1.2; font-weight: 700; color: var(--color-primary-navy); }
h2 { font-size: 1.75rem; line-height: 1.3; font-weight: 600; margin-top: 2.5rem; margin-bottom: 1rem; color: var(--color-primary-navy); }
h3 { font-size: 1.3rem; line-height: 1.4; font-weight: 600; margin-top: 1.8rem; margin-bottom: 0.6rem; color: var(--color-primary-navy); }
h4 { font-size: 1.05rem; font-weight: 600; margin-top: 1.2rem; margin-bottom: 0.4rem; color: var(--color-text-main); }

p { margin-bottom: 1.4rem; }
ul, ol { margin-bottom: 1.4rem; padding-left: 1.6rem; }
li { margin-bottom: 0.45rem; }
strong { font-weight: 700; color: var(--color-primary-navy); }
[data-theme="dark"] strong { color: #FFFFFF; }
a { color: var(--color-accent-blue); text-decoration: none; transition: var(--transition); }
a:hover { text-decoration: underline; }

/* Barra de Progresso Superior */
.reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-teal), var(--color-accent-blue));
  width: 0%;
  z-index: 1000;
  transition: width 0.1s ease-out;
}

/* Header Fixo */
.top-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background-color: var(--color-card-bg);
  border-bottom: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 900;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.top-header .brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary-navy);
}

.top-header .brand svg {
  color: var(--color-accent-teal);
}

.top-header .header-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-main);
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  font-weight: 500;
  transition: var(--transition);
}

.btn-icon:hover {
  background-color: rgba(23, 105, 170, 0.08);
  border-color: var(--color-accent-blue);
  color: var(--color-accent-blue);
}

/* Layout Geral: Grid com Barra Lateral e Conteúdo */
.app-container {
  max-width: 1360px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  gap: 2.5rem;
  padding: 2rem 1.5rem 6rem;
  position: relative;
}

/* Sidebar e Navegação */
.sidebar {
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
  height: calc(100vh - var(--header-height) - 3rem);
  overflow-y: auto;
  padding-right: 1rem;
}

.sidebar-title {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.toc-list {
  list-style: none;
  padding-left: 0;
  margin-bottom: 2rem;
}

.toc-item {
  margin-bottom: 0.25rem;
}

.toc-link {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.86rem;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  border-left: 2px solid transparent;
  line-height: 1.35;
  transition: var(--transition);
}

.toc-link:hover {
  color: var(--color-accent-blue);
  background-color: rgba(23, 105, 170, 0.05);
  text-decoration: none;
}

.toc-link.active {
  color: var(--color-accent-blue);
  font-weight: 600;
  background-color: rgba(23, 105, 170, 0.08);
  border-left-color: var(--color-accent-blue);
}

/* Artigo Principal */
.main-content {
  max-width: var(--max-content-width);
  margin: 0 auto;
  width: 100%;
}

/* HERO DO CAPÍTULO (5.1) */
.chapter-hero {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.chapter-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--color-primary-navy), var(--color-accent-teal), var(--color-accent-blue));
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.badge {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 9999px;
  background-color: rgba(23, 105, 170, 0.1);
  color: var(--color-accent-blue);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.badge.teal {
  background-color: rgba(22, 138, 131, 0.12);
  color: var(--color-accent-teal);
}

.badge.amber,
.badge.gold {
  background-color: rgba(232, 162, 58, 0.12);
  color: #B4731A;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-top: 0.6rem;
  margin-bottom: 1.5rem;
}

.hero-quote-box {
  background: rgba(22, 138, 131, 0.05);
  border-left: 3px solid var(--color-accent-teal);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  font-size: 0.98rem;
  color: var(--color-text-main);
}

.hero-quote-box .label {
  font-style: normal;
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--color-accent-teal);
  display: block;
  margin-bottom: 0.25rem;
}

/* O CAPÍTULO EM 60 SEGUNDOS (5.2) */
.quick-summary-box {
  background: linear-gradient(135deg, rgba(16, 42, 67, 0.03), rgba(23, 105, 170, 0.04));
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem;
  margin-bottom: 3.5rem;
}

.quick-summary-box h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0;
  color: var(--color-primary-navy);
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.quick-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.quick-card .title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-accent-blue);
  margin-bottom: 0.4rem;
}

.quick-card p {
  font-size: 0.92rem;
  margin-bottom: 0;
  line-height: 1.5;
}

/* SISTEMA DE DESTAQUES VISUAIS (5.5) */
.callout {
  border-left: 4px solid var(--color-accent-blue);
  background-color: var(--color-card-bg);
  padding: 1.35rem 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 2rem 0;
  box-shadow: var(--shadow-sm);
  border-top: 1px solid var(--color-border-subtle);
  border-right: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

.callout .callout-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.6rem;
}

.callout-essencial {
  border-left-color: var(--color-accent-blue);
  background-color: rgba(23, 105, 170, 0.03);
}
.callout-essencial .callout-header { color: var(--color-accent-blue); }

.callout-atencao {
  border-left-color: var(--color-danger);
  background-color: rgba(217, 56, 58, 0.03);
}
.callout-atencao .callout-header { color: var(--color-danger); }

.callout-exemplo {
  border-left-color: var(--color-accent-teal);
  background-color: rgba(22, 138, 131, 0.03);
}
.callout-exemplo .callout-header { color: var(--color-accent-teal); }

.callout-aplicacao {
  border-left-color: #8E44AD;
  background-color: rgba(142, 68, 173, 0.03);
}
.callout-aplicacao .callout-header { color: #8E44AD; }

.callout-reflexao {
  border-left-color: var(--color-amber-note);
  background-color: rgba(232, 162, 58, 0.04);
}
.callout-reflexao .callout-header { color: #B4731A; }

.callout-evidencia {
  border-left-color: #27AE60;
  background-color: rgba(39, 174, 96, 0.03);
}
.callout-evidencia .callout-header { color: #27AE60; }

.callout-insight {
  border-left-color: #E67E22;
  background-color: rgba(230, 126, 34, 0.03);
}
.callout-insight .callout-header { color: #E67E22; }

/* DIAGRAMAS EM SVG (5.4) */
.diagram-wrapper {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem 1.5rem;
  margin: 2.5rem 0;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.diagram-header {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-primary-navy);
  margin-bottom: 0.35rem;
}

.diagram-caption {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.diagram-svg-container {
  width: 100%;
  overflow-x: auto;
  display: flex;
  justify-content: center;
}

.diagram-svg-container svg {
  max-width: 100%;
  height: auto;
}

.diagram-explanation {
  font-size: 0.88rem;
  color: var(--color-text-main);
  text-align: left;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border-subtle);
  line-height: 1.6;
}

/* MODO FEYNMAN (6.0) */
.feynman-box {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  margin: 2.5rem 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.feynman-header {
  background: linear-gradient(135deg, rgba(22, 138, 131, 0.08), rgba(23, 105, 170, 0.08));
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border-subtle);
}

.feynman-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-primary-navy);
}

.btn-feynman-toggle {
  background: var(--color-accent-teal);
  color: #FFFFFF;
  border: none;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.82rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.btn-feynman-toggle:hover {
  background: #116e68;
}

.feynman-content {
  padding: 1.75rem 1.5rem;
  display: none;
}

.feynman-content.active {
  display: block;
}

.feynman-step {
  margin-bottom: 1.75rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px dashed var(--color-border-subtle);
}

.feynman-step:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.feynman-step-title {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent-teal);
  margin-bottom: 0.4rem;
}

.feynman-checklist {
  list-style: none;
  padding-left: 0;
  margin-top: 0.75rem;
}

.feynman-checklist li {
  font-family: var(--font-sans);
  font-size: 0.86rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-main);
}

/* APLICAÇÃO PERSONALIZADA (7.0) */
.clinical-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0 3rem;
}

.clinical-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.clinical-card .header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.clinical-card .domain-tag {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: rgba(23, 105, 170, 0.1);
  color: var(--color-accent-blue);
}

.clinical-card p {
  font-size: 0.92rem;
  margin-bottom: 0.75rem;
  line-height: 1.55;
}

.clinical-field {
  margin-top: 0.5rem;
  font-size: 0.88rem;
}

.clinical-field strong {
  font-family: var(--font-sans);
  color: var(--color-primary-navy);
}

/* LABORATÓRIO DE DEEP WORK & EXPERIMENTOS (8.0) */
.lab-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin: 3rem 0;
  box-shadow: var(--shadow-md);
}

.lab-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-primary-navy);
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.lab-field {
  margin-bottom: 1.25rem;
}

.lab-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  margin-bottom: 0.35rem;
}

.lab-input, .lab-textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  background: var(--color-bg-light);
  color: var(--color-text-main);
  transition: var(--transition);
}

.lab-textarea {
  resize: vertical;
  min-height: 80px;
}

.lab-input:focus, .lab-textarea:focus {
  outline: none;
  border-color: var(--color-accent-blue);
  background: var(--color-card-bg);
  box-shadow: 0 0 0 3px rgba(23, 105, 170, 0.15);
}

.auto-save-status {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--color-success);
  margin-top: 0.25rem;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

/* PLANO PRÁTICO EM HORIZONTES (9.0) */
.plan-tabs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

.plan-column {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.plan-column .horizon-badge {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent-teal);
  margin-bottom: 0.75rem;
  display: block;
}

/* QUIZZES E RECUPERAÇÃO ATIVA (11.0) */
.quiz-section {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  margin: 3.5rem 0;
  box-shadow: var(--shadow-md);
}

.quiz-question-card {
  background: var(--color-bg-light);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1.75rem;
}

.question-text {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--color-primary-navy);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.75rem 1rem;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: var(--transition);
}

.quiz-option:hover {
  border-color: var(--color-accent-blue);
  background: rgba(23, 105, 170, 0.04);
}

.quiz-option.selected {
  border-color: var(--color-accent-blue);
  background: rgba(23, 105, 170, 0.08);
  font-weight: 600;
}

.quiz-option.correct {
  border-color: var(--color-success);
  background: rgba(30, 130, 76, 0.1);
  color: var(--color-success);
}

.quiz-option.incorrect {
  border-color: var(--color-danger);
  background: rgba(217, 56, 58, 0.08);
  color: var(--color-danger);
}

.quiz-feedback {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  line-height: 1.5;
  display: none;
}

.quiz-feedback.show {
  display: block;
}

.quiz-feedback.success {
  background: rgba(30, 130, 76, 0.1);
  border-left: 3px solid var(--color-success);
  color: var(--color-success);
}

.quiz-feedback.error {
  background: rgba(217, 56, 58, 0.08);
  border-left: 3px solid var(--color-danger);
  color: #A92325;
}

.quiz-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.5rem;
}

/* FLASHCARDS INTERATIVOS (12.0) */
.flashcards-container {
  margin: 3.5rem 0;
}

.flashcards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  perspective: 1000px;
}

.flashcard-wrapper {
  height: 250px;
  cursor: pointer;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  transform-style: preserve-3d;
}

.flashcard-wrapper.flipped .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-front, .flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  box-shadow: var(--shadow-sm);
}

.flashcard-front {
  background-color: var(--color-card-bg);
  color: var(--color-primary-navy);
}

.flashcard-front .tag {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent-blue);
  margin-bottom: 0.75rem;
}

.flashcard-front h4 {
  font-size: 1.1rem;
  line-height: 1.4;
  margin: 0;
}

.flashcard-front .hint {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 1rem;
}

.flashcard-back {
  background: linear-gradient(135deg, var(--color-card-bg), rgba(23, 105, 170, 0.04));
  transform: rotateY(180deg);
  font-size: 0.88rem;
  line-height: 1.55;
  overflow-y: auto;
}

.flashcard-actions {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.75rem;
  width: 100%;
}

.btn-mastery {
  flex: 1;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  padding: 0.35rem 0.25rem;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  background: var(--color-card-bg);
  cursor: pointer;
  transition: var(--transition);
}

.btn-mastery:hover {
  background: var(--color-accent-blue);
  color: #fff;
  border-color: var(--color-accent-blue);
}

/* ESTACIONAMENTO DE IDEIAS / DOCK FLUTUANTE (10.0) */
.idea-parking-btn {
  position: fixed;
  bottom: 1.75rem;
  right: 1.75rem;
  background: var(--color-primary-navy);
  color: #FFFFFF;
  border: none;
  border-radius: 9999px;
  padding: 0.75rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  z-index: 1000;
  transition: var(--transition);
}

.idea-parking-btn:hover {
  transform: translateY(-2px);
  background: var(--color-accent-blue);
}

.idea-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 19, 30, 0.6);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  z-index: 1100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.idea-modal-backdrop.active {
  display: flex;
}

.idea-modal {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 580px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.idea-modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.idea-modal-body {
  padding: 1.5rem;
  overflow-y: auto;
}

.idea-list {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.idea-item {
  background: var(--color-bg-light);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
}

.idea-item .category {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-accent-blue);
}

.idea-item .text {
  font-size: 0.88rem;
  margin: 0.25rem 0;
}

.idea-item .date {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--color-text-muted);
}

/* MODO FOCO (15.0) */
body.focus-mode .sidebar,
body.focus-mode .top-header .brand,
body.focus-mode .hero-meta,
body.focus-mode .idea-parking-btn {
  display: none !important;
}

body.focus-mode .app-container {
  grid-template-columns: 1fr;
  padding-top: 1rem;
}

body.focus-mode .main-content {
  max-width: 720px;
}

/* RODAPÉ E NAVEGAÇÃO ENTRE CAPÍTULOS */
.chapter-nav-footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  max-width: 320px;
  transition: var(--transition);
}

.nav-card:hover {
  border-color: var(--color-accent-blue);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}

.nav-card .dir {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.nav-card .target-title {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-primary-navy);
}

/* RESPONSIVIDADE */
@media (max-width: 992px) {
  .app-container {
    grid-template-columns: minmax(0, 1fr) !important;
    gap: 1.5rem;
  }
  #btn-menu-toggle {
    display: inline-flex !important;
  }
  .sidebar.mobile-open {
    height: auto;
    overflow-y: auto;
  }
  .sidebar {
    display: none; /* Em telas menores, TOC recolhível */
  }
  .sidebar.mobile-open {
    display: block;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-card-bg);
    z-index: 850;
    padding: 1.5rem;
  }
}

@media (max-width: 640px) {
  .top-header {
    padding: 0 0.75rem;
    gap: 0.5rem;
  }
  .top-header .brand span {
    display: none;
  }
  .top-header .header-controls {
    gap: 0.35rem;
    flex-wrap: nowrap;
  }
  #btn-focus-toggle {
    display: none;
  }
  .top-header .btn-icon {
    padding: 0.35rem 0.5rem;
    font-size: 0.75rem;
    white-space: nowrap;
  }
  .app-container {
    padding: 1.25rem 1rem 6rem;
  }
  .chapter-hero {
    padding: 1.75rem 1.25rem;
  }
  .chapter-hero h1 {
    font-size: 1.9rem;
    overflow-wrap: anywhere;
  }
  .main-content img,
  .main-content svg,
  .main-content table {
    max-width: 100%;
  }
  .main-content pre,
  .main-content table {
    overflow-x: auto;
    display: block;
  }
}

@media print {
  .top-header, .sidebar, .idea-parking-btn, .btn-icon, .chapter-nav-footer {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .app-container {
    grid-template-columns: 1fr;
    padding: 0;
  }
}