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

@font-face{font-family:"Saira Condensed";font-style:normal;font-weight:400;font-display:swap;src:url("../fonts/saira/saira-condensed-71def298.woff2") format("woff2")}
@font-face{font-family:"Saira Condensed";font-style:normal;font-weight:500;font-display:swap;src:url("../fonts/saira/saira-condensed-37dc60ed.woff2") format("woff2")}
@font-face{font-family:"Saira Condensed";font-style:normal;font-weight:600;font-display:swap;src:url("../fonts/saira/saira-condensed-3f0d16d4.woff2") format("woff2")}
@font-face{font-family:"Saira Condensed";font-style:normal;font-weight:700;font-display:swap;src:url("../fonts/saira/saira-condensed-60f4ce41.woff2") format("woff2")}
@font-face{font-family:"Literata";font-style:normal;font-weight:400;font-display:swap;src:url("../fonts/literata/literata-latin-400-normal.woff2") format("woff2")}
@font-face{font-family:"Literata";font-style:italic;font-weight:400;font-display:swap;src:url("../fonts/literata/literata-latin-400-italic.woff2") format("woff2")}
@font-face{font-family:"Literata";font-style:normal;font-weight:700;font-display:swap;src:url("../fonts/literata/literata-latin-700-normal.woff2") format("woff2")}
@font-face{font-family:"Literata";font-style:italic;font-weight:700;font-display:swap;src:url("../fonts/literata/literata-latin-700-italic.woff2") format("woff2")}

/* paleta do guilhermecardio.com.br (mesmos valores das diretrizes) */
:root {
  --ink:#454546; --paper:#faf9f7; --amber:#ff9800; --tinta:#b86600; --tinta-txt:#a35a00; --line:#dedbd7; --line2:#ebe8e4;
  --text:var(--ink); --surface:#fff; --soft:#f3f1ee; --med:#5c5a58; --muted:#6d6862; --onamber:#2b2b2c;
  --qshadow:0 1px 2px rgba(69,69,70,.06),0 10px 28px rgba(69,69,70,.10);
  --ok:#2e7d4f; --okbg:#eef6f1; --okbd:#cfe5d7; --warn:#8a5200; --warnbg:#fbf4e8; --warnbd:#eedcbc;
  --bad:#b42318; --badbg:#fcefed; --badbd:#f1cdc8; --info:#3d5a80; --infobg:#eef2f7; --infobd:#cbd7e6;
  --purple:#5b4b8a; --purplebg:#f3f0f8; --purplebd:#dad2ea;
  --f-sans:'Saira Condensed','Arial Narrow',Arial,sans-serif; --f-serif:'Literata',Georgia,'Times New Roman',serif;
  --t-xs:.875rem; --t-sm:1rem; --t-base:1.0556rem; --t-lg:1.45rem;

  /* nomes usados pelo Deep Work, apontando para a paleta do site */
  --color-primary-navy: var(--ink);
  --color-accent-blue: var(--tinta-txt);
  --color-accent-teal: var(--info);
  --color-amber-note: var(--amber);
  --color-bg-light: var(--paper);
  --color-card-bg: var(--surface);
  --color-border-subtle: var(--line);
  --color-text-main: var(--text);
  --color-text-muted: var(--muted);
  --color-danger: var(--bad);
  --color-success: var(--ok);
  --color-bg-card: var(--surface);
  --color-bg-subtle: var(--soft);
  --color-accent-gold: var(--amber);

  --font-serif: var(--f-serif);
  --font-sans: var(--f-sans);
  --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;

  --shadow-sm: 0 1px 2px rgba(69,69,70,.06);
  --shadow-md: 0 1px 2px rgba(69,69,70,.06),0 6px 18px rgba(69,69,70,.08);
  --shadow-lg: var(--qshadow);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --ink:#e8e4de; --paper:#1a1917; --tinta:#e8a040; --tinta-txt:#e8a040; --line:#3a3733; --line2:#2f2d2a;
  --surface:#22211f; --soft:#262421; --med:#c2bcb2; --muted:#9a948a;
  --qshadow:0 1px 2px rgba(0,0,0,.3),0 12px 30px rgba(0,0,0,.35);
  --ok:#7fcf9c; --okbg:#1b2620; --okbd:#2f4a3a; --warn:#f2b45c; --warnbg:#2a2419; --warnbd:#4a3d24;
  --bad:#f08a80; --badbg:#2b1c1a; --badbd:#4d2b28; --info:#9db8dc; --infobg:#1c222b; --infobd:#2f3d4f;
  --purple:#bfaee6; --purplebg:#231f2c; --purplebd:#3d3450;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.3); --shadow-md: 0 4px 8px rgba(0,0,0,.35);
} }
:root[data-theme="dark"] {
  --ink:#e8e4de; --paper:#1a1917; --tinta:#e8a040; --tinta-txt:#e8a040; --line:#3a3733; --line2:#2f2d2a;
  --surface:#22211f; --soft:#262421; --med:#c2bcb2; --muted:#9a948a;
  --qshadow:0 1px 2px rgba(0,0,0,.3),0 12px 30px rgba(0,0,0,.35);
  --ok:#7fcf9c; --okbg:#1b2620; --okbd:#2f4a3a; --warn:#f2b45c; --warnbg:#2a2419; --warnbd:#4a3d24;
  --bad:#f08a80; --badbg:#2b1c1a; --badbd:#4d2b28; --info:#9db8dc; --infobg:#1c222b; --infobd:#2f3d4f;
  --purple:#bfaee6; --purplebg:#231f2c; --purplebd:#3d3450;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.3); --shadow-md: 0 4px 8px rgba(0,0,0,.35);
}

/* 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;
}

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); }

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: color-mix(in srgb, var(--tinta) 8%, transparent);
  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: color-mix(in srgb, var(--tinta) 5%, transparent);
  text-decoration: none;
}

.toc-link.active {
  color: var(--color-accent-blue);
  font-weight: 600;
  background-color: color-mix(in srgb, var(--tinta) 8%, transparent);
  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: color-mix(in srgb, var(--tinta) 10%, transparent);
  color: var(--color-accent-blue);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.badge.teal {
  background-color: color-mix(in srgb, var(--info) 12%, transparent);
  color: var(--color-accent-teal);
}

.badge.amber,
.badge.gold {
  background-color: color-mix(in srgb, var(--amber) 12%, transparent);
  color: var(--tinta-txt);
}

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

.hero-quote-box {
  background: color-mix(in srgb, var(--info) 5%, transparent);
  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(69, 69, 70, 0.03), color-mix(in srgb, var(--tinta) 4%, transparent));
  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: color-mix(in srgb, var(--tinta) 3%, transparent);
}
.callout-essencial .callout-header { color: var(--color-accent-blue); }

.callout-atencao {
  border-left-color: var(--color-danger);
  background-color: color-mix(in srgb, var(--bad) 3%, transparent);
}
.callout-atencao .callout-header { color: var(--color-danger); }

.callout-exemplo {
  border-left-color: var(--color-accent-teal);
  background-color: color-mix(in srgb, var(--info) 3%, transparent);
}
.callout-exemplo .callout-header { color: var(--color-accent-teal); }

.callout-aplicacao {
  border-left-color: var(--purple);
  background-color: color-mix(in srgb, var(--purple) 3%, transparent);
}
.callout-aplicacao .callout-header { color: var(--purple); }

.callout-reflexao {
  border-left-color: var(--color-amber-note);
  background-color: color-mix(in srgb, var(--amber) 4%, transparent);
}
.callout-reflexao .callout-header { color: var(--tinta-txt); }

.callout-evidencia {
  border-left-color: var(--ok);
  background-color: color-mix(in srgb, var(--ok) 3%, transparent);
}
.callout-evidencia .callout-header { color: var(--ok); }

.callout-insight {
  border-left-color: var(--tinta-txt);
  background-color: color-mix(in srgb, var(--tinta) 3%, transparent);
}
.callout-insight .callout-header { color: var(--tinta-txt); }

/* 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, color-mix(in srgb, var(--info) 8%, transparent), color-mix(in srgb, var(--tinta) 8%, transparent));
  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: var(--info);
}

.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: color-mix(in srgb, var(--tinta) 10%, transparent);
  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 color-mix(in srgb, var(--tinta) 15%, transparent);
}

.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: color-mix(in srgb, var(--tinta) 4%, transparent);
}

.quiz-option.selected {
  border-color: var(--color-accent-blue);
  background: color-mix(in srgb, var(--tinta) 8%, transparent);
  font-weight: 600;
}

.quiz-option.correct {
  border-color: var(--color-success);
  background: color-mix(in srgb, var(--ok) 10%, transparent);
  color: var(--color-success);
}

.quiz-option.incorrect {
  border-color: var(--color-danger);
  background: color-mix(in srgb, var(--bad) 8%, transparent);
  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: color-mix(in srgb, var(--ok) 10%, transparent);
  border-left: 3px solid var(--color-success);
  color: var(--color-success);
}

.quiz-feedback.error {
  background: color-mix(in srgb, var(--bad) 8%, transparent);
  border-left: 3px solid var(--color-danger);
  color: var(--bad);
}

.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), color-mix(in srgb, var(--tinta) 4%, transparent));
  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(69, 69, 70, 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;
  }
}

/* ==========================================================================
   VISUAL DO GUILHERMECARDIO.COM.BR (acrescentado por _fonte/ajustar.py)
   ========================================================================== */
html { scroll-padding-top: 0 !important; }
html body [id] { scroll-margin-top: calc(var(--site-header-height, 96px) + var(--header-height) + 16px); }
body { background: var(--paper); color: var(--text); }
h1, h2, h3 { font-family: var(--f-sans); font-weight: 700; color: var(--ink); }
h1 { font-size: clamp(2.1rem, 1.4rem + 2.4vw, 3rem); line-height: 1.1; }
h2 { font-size: var(--t-lg); line-height: 1.25; }
h3 { font-size: 1.25rem; }
strong { color: inherit; }
a { color: var(--tinta-txt); }
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible, select:focus-visible,
textarea:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--amber) !important; outline-offset: 2px !important; box-shadow: 0 0 0 2px var(--ink) !important; }

/* barra da aula: logo abaixo do cabeçalho do site */
.top-header { top: var(--site-header-height, 96px); z-index: 90; background: var(--paper); box-shadow: none; border-bottom: 1px solid var(--line); gap: 12px; }
.top-header .brand { font-size: 1.05rem; color: var(--ink); white-space: nowrap; }
.top-header .brand svg { color: var(--tinta); }
.sec-now { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; line-height: 1.15; padding: 0 14px; border-left: 1px solid var(--line); }
.sec-now small { font-family: var(--f-sans); font-size: .72rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.sec-now span { font-family: var(--f-sans); font-size: .95rem; font-weight: 700; color: var(--ink); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.reading-progress-bar { position: absolute; top: auto; bottom: -1px; height: 2px; background: var(--amber); z-index: 1; }
.btn-icon { font-family: var(--f-sans); font-size: .9rem; font-weight: 600; color: var(--ink); border-color: var(--line); background: var(--surface); min-height: 40px; }
.btn-icon:hover { background: var(--soft); border-color: var(--ink); color: var(--ink); }
.sidebar { top: calc(var(--site-header-height, 96px) + var(--header-height) + 1.5rem); height: calc(100vh - var(--site-header-height, 96px) - var(--header-height) - 3rem); }
.sidebar-title { font-family: var(--f-sans); letter-spacing: .12em; }
.toc-link { font-size: .95rem; color: var(--med); }
.toc-link:hover { color: var(--ink); background: var(--soft); }
.toc-link.active { color: var(--ink); background: var(--soft); border-left-color: var(--amber); }
.chapter-hero::before { background: var(--amber); height: 4px; }
.badge { font-size: .8rem; letter-spacing: .02em; }
.idea-parking-btn { background: var(--amber); color: var(--onamber); font-family: var(--f-sans); font-weight: 700; }
.idea-parking-btn:hover { background: var(--amber); filter: brightness(1.05); }
.btn-feynman-toggle, .btn-mastery { font-family: var(--f-sans); font-weight: 700; }
.btn-feynman-toggle { background: var(--amber); color: var(--onamber); font-size: .9rem; min-height: 40px; }
.btn-feynman-toggle:hover { background: var(--amber); filter: brightness(1.05); }
.btn-mastery { color: var(--ink); font-size: .8rem; min-height: 36px; }

/* questões: cartão dos casos do site */
.quiz-site { margin-top: 1rem; }
.qcard { margin: 20px 0; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); box-shadow: var(--qshadow); overflow: hidden; padding: 0 0 18px; }
.qcard > *:not(.qn) { margin-left: 22px; margin-right: 22px; }
.qcard .qn { display: flex; align-items: center; gap: 10px; padding: 10px 22px; margin: 0 0 4px; background: var(--soft); border-bottom: 1px solid var(--line); font-family: var(--f-sans); font-size: var(--t-xs); font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--ink); }
.qcard .qs { font-weight: 700; margin-top: .9em; margin-bottom: .8em; font-size: var(--t-base); line-height: 1.5; color: var(--ink); }
.opts { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.opts li { margin: 0; display: flex; gap: 8px; align-items: stretch; }
.opts button[data-i] { flex: 1; min-width: 0; text-align: left; display: flex; gap: 12px; align-items: flex-start; border: 1px solid var(--line); background: var(--paper); border-radius: 6px; padding: 10px 12px; font-family: var(--f-serif); font-size: var(--t-sm); color: var(--text); min-height: 44px; line-height: 1.6; cursor: pointer; letter-spacing: 0; }
.opts button .L { flex: 0 0 1.7em; height: 1.7em; border-radius: 6px; display: grid; place-items: center; border: 1px solid var(--line); font-family: var(--f-sans); font-weight: 700; font-size: var(--t-xs); color: var(--tinta-txt); background: var(--surface); }
.opts button[data-i]:hover { border-color: var(--ink); }
.opts button[data-i].sel { border-color: var(--tinta); box-shadow: inset 3px 0 0 var(--tinta); }
.opts button[data-i].right { border-color: var(--okbd); background: var(--okbg); box-shadow: none; }
.opts button[data-i].right .L { background: var(--ok); border-color: var(--ok); color: #fff; }
.opts button[data-i].wrong { border-color: var(--badbd); background: var(--badbg); box-shadow: none; }
.opts button[data-i].wrong .L { background: var(--bad); border-color: var(--bad); color: #fff; }
:root[data-theme="dark"] .opts button[data-i].right .L, :root[data-theme="dark"] .opts button[data-i].wrong .L { color: #1a1917; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .opts button[data-i].right .L, :root:not([data-theme="light"]) .opts button[data-i].wrong .L { color: #1a1917; } }
.opts .cut-b { flex: 0 0 44px; width: 44px; min-height: 44px; padding: 0; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); color: var(--muted); font-size: 18px; line-height: 1; cursor: pointer; }
.opts .cut-b:hover { border-color: var(--ink); color: var(--ink); }
.opts li.cut .cut-b { color: var(--tinta-txt); border-color: var(--tinta); }
.opts li.cut > button[data-i] { opacity: .55; cursor: default; }
.opts li.cut > button[data-i] > span:last-child { text-decoration: line-through; text-decoration-thickness: 1.5px; }
.opts li.cut > button[data-i]:hover { border-color: var(--line); }
.ans { margin-top: 14px; border-top: 1px solid var(--line2); }
.ans > summary { cursor: pointer; list-style: none; padding: 12px 0 0; font-family: var(--f-sans); font-size: var(--t-sm); font-weight: 700; color: var(--tinta-txt); min-height: 44px; display: flex; align-items: center; justify-content: space-between; }
.ans > summary::-webkit-details-marker { display: none; }
.ans > summary::after { content: "+"; font-size: var(--t-lg); line-height: 1; }
.ans[open] > summary::after { content: "−"; }
.ans > summary:focus-visible { outline-offset: -3px !important; box-shadow: inset 0 0 0 5px var(--ink) !important; }
.ans-b { padding: 6px 0 0; font-size: var(--t-sm); line-height: 1.65; color: var(--med); }
.ans-b .ok { color: var(--ok); font-family: var(--f-sans); font-weight: 700; font-size: 1.05rem; margin-bottom: .4rem; }
.ans-b .cb { margin: 10px 0 4px; padding: 2px 0 2px 14px; border-left: 2px solid var(--ok); }
.ans-b .cbt { font-family: var(--f-sans); font-weight: 700; font-size: var(--t-xs); letter-spacing: .08em; text-transform: uppercase; color: var(--ok); margin-bottom: 4px; }
.ans-b .cb p { margin: .35em 0; color: var(--text); max-width: 38em; }
.quiz-site .quiz-controls { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; margin-top: 8px; }
.quiz-site .quiz-score-tag { font-family: var(--f-sans); font-weight: 700; color: var(--ink); }

/* celular e tablet: o cabeçalho do site rola junto; a barra da aula fica fixa no topo */
@media (max-width: 992px) {
  html body > header.main-head:first-of-type { position: relative !important; }   /* vence a regra sticky da navigation-v7 */
  .top-header { top: 0; }
  html body [id] { scroll-margin-top: calc(var(--header-height) + 16px); }
  .sidebar.mobile-open { top: var(--header-height); }
}
@media (max-width: 640px) {
  .sec-now { display: none; }
  .qcard > *:not(.qn) { margin-left: 16px; margin-right: 16px; }
  .qcard .qn { padding: 10px 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto !important; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}
@media print { .opts .cut-b { display: none; } .ans > .ans-b { display: block; } }