@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400;0,600;0,700;1,400&family=DM+Sans:opsz,wght@9..40,300;9..40,400;9..40,500;9..40,600&display=swap');

/* ── CSS Variables ───────────────────────────────────── */
:root {
  --bg-primary:    #0f1117;
  --bg-secondary:  #1a1d27;
  --bg-tertiary:   #242838;
  --text-primary:  #e8eaf0;
  --text-secondary:#9ca3af;
  --text-muted:    #6b7280;
  --accent:        #4f8ef7;
  --accent-hover:  #6ba3f9;
  --accent-dim:    rgba(79,142,247,0.14);
  --border:        #2d3148;
  --border-subtle: #1e2235;
  --card-bg:       #1a1d27;
  --shadow:        0 4px 24px rgba(0,0,0,0.45);
  --shadow-sm:     0 2px 8px rgba(0,0,0,0.3);
  --radius:        12px;
  --radius-sm:     8px;
  --radius-xs:     6px;
  --sidebar-width: 260px;
  --content-max:   1120px;
  --home-max:      1480px;
  --reading-max:   74ch;
  --font-heading:  'Lora', Georgia, 'Times New Roman', serif;
  --font-body:     'DM Sans', system-ui, -apple-system, sans-serif;

  /* Teaching blocks */
  --analogy-bg:    #141c2e;
  --analogy-bdr:   #4f8ef7;
  --analogy-txt:   #93c5fd;
  --example-bg:    #0f1c14;
  --example-bdr:   #22c55e;
  --example-txt:   #86efac;
  --memorize-bg:   #1c1605;
  --memorize-bdr:  #f59e0b;
  --memorize-txt:  #fde68a;
  --error-bg:      #1c0d0d;
  --error-bdr:     #ef4444;
  --error-txt:     #fca5a5;
  --summary-bg:    #160e24;
  --summary-bdr:   #8b5cf6;
  --summary-txt:   #c4b5fd;
  --review-bg:     #0c1b17;
  --review-bdr:    #10b981;
  --review-txt:    #6ee7b7;

  --transition:      0.2s ease;
  --transition-slow: 0.4s ease;
}

[data-theme="light"] {
  --bg-primary:    #f8f9fc;
  --bg-secondary:  #ffffff;
  --bg-tertiary:   #f0f2f8;
  --text-primary:  #1a1d27;
  --text-secondary:#4b5563;
  --text-muted:    #9ca3af;
  --accent:        #2563eb;
  --accent-hover:  #1d4ed8;
  --accent-dim:    rgba(37,99,235,0.1);
  --border:        #e5e7eb;
  --border-subtle: #f3f4f6;
  --card-bg:       #ffffff;
  --shadow:        0 4px 24px rgba(0,0,0,0.09);
  --shadow-sm:     0 2px 8px rgba(0,0,0,0.06);

  --analogy-bg:  #eff6ff;
  --analogy-bdr: #2563eb;
  --analogy-txt: #1e40af;
  --example-bg:  #f0fdf4;
  --example-bdr: #16a34a;
  --example-txt: #15803d;
  --memorize-bg: #fffbeb;
  --memorize-bdr:#d97706;
  --memorize-txt:#92400e;
  --error-bg:    #fef2f2;
  --error-bdr:   #dc2626;
  --error-txt:   #991b1b;
  --summary-bg:  #f5f3ff;
  --summary-bdr: #7c3aed;
  --summary-txt: #5b21b6;
  --review-bg:   #ecfdf5;
  --review-bdr:  #059669;
  --review-txt:  #065f46;
}

/* ── Skip navigation (accessibility) ────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 10000;
  padding: 0.55rem 1.1rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  text-decoration: none;
  transition: top 0.15s ease;
}
.skip-link:focus { top: 0; outline: 3px solid #fff; outline-offset: 2px; }

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  transition: background-color var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
}

/* ── Typography ──────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.3;
  color: var(--text-primary);
}
h1 { font-size: 2.2rem; font-weight: 700; }
h2 { font-size: 1.65rem; font-weight: 600; margin: 2.5rem 0 1rem; }
h3 { font-size: 1.25rem; font-weight: 600; margin: 2rem 0 0.75rem; }
h4 { font-size: 1.05rem; font-weight: 600; margin: 1.5rem 0 0.5rem; }

p { margin-bottom: 1rem; color: var(--text-secondary); }
p:last-child { margin-bottom: 0; }

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }

strong { color: var(--text-primary); font-weight: 600; }

code {
  font-family: 'Courier New', monospace;
  background: var(--bg-tertiary);
  color: var(--accent);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-xs);
  font-size: 0.88em;
  border: 1px solid var(--border);
}

pre {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.25rem 0;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.875rem;
  line-height: 1.6;
}

ul, ol { padding-left: 1.5rem; margin-bottom: 1rem; }
li { margin-bottom: 0.4rem; color: var(--text-secondary); }

/* ── Layout ──────────────────────────────────────────── */
.app-layout { display: flex; flex-direction: row; height: 100vh; overflow: hidden; }

/* ── Sidebar ─────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  background:
    linear-gradient(180deg, rgba(79,142,247,0.08) 0%, rgba(79,142,247,0) 180px),
    var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: width var(--transition-slow), transform var(--transition-slow), background-color var(--transition-slow);
}
.sidebar--collapsed {
  width: 0 !important;
  overflow: hidden !important;
  padding: 0 !important;
}
#sidebarToggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  flex-shrink: 0;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.sidebar-logo {
  padding: 1.2rem 1rem 1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.sidebar-logo a {
  display: flex; align-items: center; gap: 0.6rem;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-size: 1.25rem; font-weight: 700;
}
.logo-icon {
  width: 30px; height: 30px;
  background: var(--accent);
  border-radius: var(--radius-xs);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; flex-shrink: 0;
}

.sidebar-search {
  padding: 0.9rem 0.95rem 1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.sidebar-search input {
  width: 100%;
  padding: 0.72rem 0.85rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  outline: none;
  transition: border-color var(--transition), background-color var(--transition), box-shadow var(--transition);
}
.sidebar-search input:focus {
  border-color: var(--accent);
  background: rgba(255,255,255,0.04);
  box-shadow: 0 0 0 3px rgba(79,142,247,0.14);
}
.sidebar-search input::placeholder { color: var(--text-muted); }

.search-results-panel {
  display: none;
  margin-top: 0.7rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-secondary);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.search-results-panel.visible { display: block; }

.search-result-item {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  padding: 0.75rem 0.85rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.2rem;
  border-bottom: 1px solid var(--border-subtle);
  text-align: left;
  cursor: pointer;
  font-family: var(--font-body);
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover {
  background: rgba(255,255,255,0.04);
  color: var(--text-primary);
}
.search-result-item strong { font-size: 0.86rem; }
.search-result-item span:last-child {
  font-size: 0.76rem;
  color: var(--text-muted);
  line-height: 1.45;
}
.search-result-type {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.sidebar-nav { flex: 1; padding: 0.95rem 0 1.15rem; }

.nav-section {
  margin-bottom: 1rem;
  padding: 0 0.55rem;
}

.nav-section-header {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%;
  padding: 0.45rem 0.7rem 0.6rem;
  cursor: pointer;
  border-radius: var(--radius-xs);
  border: none;
  background: transparent;
  text-align: left;
  transition: background-color var(--transition), color var(--transition);
}
.nav-section-header:hover { background: rgba(255,255,255,0.03); }
.nav-section-title {
  font-size: 0.72rem; font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.08em;
}
.nav-chevron {
  color: var(--text-muted);
  transition: transform var(--transition);
  font-style: normal; font-size: 0.7rem;
}
.nav-section.collapsed .nav-chevron { transform: rotate(-90deg); }
.nav-section.collapsed .nav-items { display: none; }

.nav-items { list-style: none; padding: 0; margin: 0; }

.nav-item a {
  display: flex; align-items: center; gap: 0.55rem;
  padding: 0.72rem 0.8rem;
  margin: 0 0 0.18rem;
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
  border: 1px solid transparent;
}
.nav-item a:hover {
  background: rgba(255,255,255,0.04);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.05);
}
.nav-item a.active {
  background: linear-gradient(180deg, rgba(79,142,247,0.18), rgba(79,142,247,0.1));
  color: var(--accent);
  font-weight: 600;
  border-color: rgba(79,142,247,0.3);
  box-shadow: inset 0 0 0 1px rgba(79,142,247,0.1);
}
.nav-icon { font-size: 0.95rem; flex-shrink: 0; }

.nav-module-item {
  margin-bottom: 0.5rem;
}

.nav-module-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.82rem 0.8rem;
  border-radius: 12px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  text-align: left;
  transition: background-color var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
}

.nav-module-trigger:hover {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.05);
  color: var(--text-primary);
}

.nav-module-item.current .nav-module-trigger,
.nav-module-item.expanded .nav-module-trigger {
  background: rgba(255,255,255,0.035);
  border-color: rgba(79,142,247,0.18);
}

.nav-module-item.current .nav-module-trigger {
  background: linear-gradient(180deg, rgba(79,142,247,0.18), rgba(79,142,247,0.08));
  box-shadow: inset 0 0 0 1px rgba(79,142,247,0.08);
}

.nav-module-main {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
}

.nav-module-icon {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.05);
}

.nav-module-text {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.16rem;
}

.nav-module-kicker {
  font-size: 0.67rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.nav-module-title {
  font-size: 0.87rem;
  line-height: 1.35;
  color: var(--text-primary);
}

.nav-module-item.current .nav-module-title {
  color: var(--accent);
}

.nav-module-chevron {
  flex-shrink: 0;
  color: var(--text-muted);
  transition: transform var(--transition), color var(--transition);
}

.nav-module-trigger[aria-expanded="true"] .nav-module-chevron {
  transform: rotate(180deg);
  color: var(--accent);
}

.nav-sub-wrap {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.28s ease;
}

.nav-sub-wrap.open {
  grid-template-rows: 1fr;
}

.nav-sub {
  list-style: none;
  padding: 0;
  margin: 0.3rem 0 0;
  overflow: hidden;
  position: relative;
}

.nav-sub::before {
  content: '';
  position: absolute;
  left: 1.05rem;
  top: 0.2rem;
  bottom: 0.45rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(79,142,247,0.28), rgba(79,142,247,0.06));
}

.nav-sub li {
  margin: 0;
}

.nav-sub li a {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.6rem 0.7rem 0.6rem 2rem;
  margin: 0 0 0.12rem 0.55rem;
  border-radius: 10px;
  border: 1px solid transparent;
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--text-muted);
}

.nav-sub li a::before {
  content: '';
  position: absolute;
  left: 0.95rem;
  top: 1rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--border);
  transition: background-color var(--transition), transform var(--transition);
}

.nav-sub li a:hover {
  color: var(--text-secondary);
  background: rgba(255,255,255,0.035);
  border-color: rgba(255,255,255,0.05);
}

.nav-sub li a.active {
  color: var(--accent);
  background: rgba(79,142,247,0.1);
  border-color: rgba(79,142,247,0.22);
}

.nav-sub li a.active::before {
  background: var(--accent);
  transform: scale(1.15);
}

.nav-sub-index {
  min-width: 1.2rem;
  font-size: 0.74rem;
  color: var(--text-muted);
}

.nav-sub-label {
  display: block;
}

.sidebar-footer {
  padding: 0.9rem;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.sidebar-progress-wrap {
  background: rgba(255,255,255,0.03);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 0.8rem 0.85rem;
}
.sp-label {
  display: flex; justify-content: space-between;
  font-size: 0.74rem; color: var(--text-muted);
  margin-bottom: 0.45rem;
}
.sp-bar {
  height: 5px; background: var(--bg-primary);
  border-radius: 3px; overflow: hidden;
}
.sp-fill {
  height: 100%; background: var(--accent);
  border-radius: 3px;
  transition: width 0.6s ease;
  width: 0%;
}

/* ── Main Content ────────────────────────────────────── */
.main-content {
  flex: 1 1 0;
  min-width: 0;
  overflow-y: auto;
  overflow-x: hidden;
}

/* ── Top Bar ─────────────────────────────────────────── */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(26,29,39,0.9);
  border-bottom: 1px solid var(--border);
  padding: 0.7rem 2rem;
  display: flex; align-items: center; justify-content: space-between;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background-color var(--transition-slow);
}
[data-theme="light"] .topbar { background: rgba(255,255,255,0.9); }

.topbar-left { display: flex; align-items: center; gap: 0.75rem; }

.hamburger {
  display: none;
  background: none; border: none; cursor: pointer;
  padding: 0.35rem;
  border-radius: var(--radius-xs);
  color: var(--text-secondary);
  transition: background-color var(--transition);
  align-items: center; justify-content: center;
}
.hamburger:hover { background: var(--bg-tertiary); color: var(--text-primary); }

.breadcrumbs {
  display: flex; align-items: center; gap: 0.4rem;
  font-size: 0.82rem; color: var(--text-muted); flex-wrap: wrap;
}
.breadcrumbs a { color: var(--text-muted); }
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumbs .sep { color: var(--border); }
.breadcrumbs .current { color: var(--text-secondary); }

.topbar-right { display: flex; align-items: center; gap: 0.6rem; }

.theme-toggle {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  display: flex; align-items: center; gap: 0.4rem;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-family: var(--font-body);
  transition: all var(--transition);
}
.theme-toggle:hover { border-color: var(--accent); color: var(--text-primary); }

/* ── Article wrapper ─────────────────────────────────── */
.article-wrapper {
  width: min(100%, var(--content-max));
  margin: 0 auto;
  padding: 2.5rem clamp(1.5rem, 2vw, 2.5rem) 5rem;
}

.page-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border);
}
.page-tag {
  display: inline-block;
  background: var(--accent-dim); color: var(--accent);
  font-size: 0.72rem; font-weight: 600;
  padding: 0.2rem 0.65rem;
  border-radius: 4px;
  text-transform: uppercase; letter-spacing: 0.07em;
  margin-bottom: 0.75rem;
}
.page-title {
  font-size: 2.2rem;
  font-family: var(--font-heading);
  margin-bottom: 0.75rem; line-height: 1.2;
}
.page-description {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 68ch;
}

.page-meta-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.15rem;
}
.page-meta-strip span {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.page-learning-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.3rem;
}
.page-learning-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}
.page-learning-kicker {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.45rem;
  font-weight: 700;
}
.page-learning-card h3 {
  margin: 0 0 0.45rem;
  font-size: 1rem;
}
.page-learning-card ul { margin: 0; padding-left: 1rem; }

.page-route-links {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.25rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.page-readiness {
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  background: var(--bg-secondary);
}
.page-readiness.ready {
  border-color: rgba(34,197,94,0.4);
  background: rgba(34,197,94,0.08);
}
.page-readiness.needs-review {
  border-color: rgba(245,158,11,0.35);
}
.page-readiness h3 {
  margin: 0.2rem 0 0.55rem;
  font-size: 1rem;
}
.page-readiness-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}
.page-readiness-grid span {
  padding: 0.32rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.76rem;
  color: var(--text-secondary);
}
.page-readiness-grid span.ok {
  border-color: rgba(34,197,94,0.45);
  color: #22c55e;
}
.page-readiness-grid span.pending {
  border-color: rgba(245,158,11,0.4);
  color: #f59e0b;
}

/* ── Section ─────────────────────────────────────────── */
.section {
  margin-bottom: 3rem;
  scroll-margin-top: 80px;
  animation: fadeInUp 0.35s ease forwards;
}
.section-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; margin-bottom: 1.25rem;
}
.section-header h2 { margin: 0; }
.section-header h3 { margin: 0; }
.section-actions { display: flex; align-items: center; gap: 0.45rem; flex-shrink: 0; }

/* ── Teaching blocks ─────────────────────────────────── */
.bloco-explicacao,
.bloco-analogia,
.bloco-exemplo,
.bloco-resumo,
.bloco-memorizar,
.bloco-erros,
.bloco-revisao {
  border-radius: var(--radius);
  padding: 1.15rem 1.4rem;
  margin: 1.2rem 0;
  border: 1px solid;
  border-left-width: 4px;
}
.bloco-explicacao {
  background: var(--bg-secondary);
  border-color: var(--border);
  border-left-color: var(--accent);
}
.bloco-analogia  { background: var(--analogy-bg);  border-color: var(--analogy-bdr); }
.bloco-exemplo   { background: var(--example-bg);  border-color: var(--example-bdr); }
.bloco-resumo    { background: var(--summary-bg);  border-color: var(--summary-bdr); }
.bloco-memorizar { background: var(--memorize-bg); border-color: var(--memorize-bdr);}
.bloco-erros     { background: var(--error-bg);    border-color: var(--error-bdr);   }
.bloco-revisao   { background: var(--review-bg);   border-color: var(--review-bdr);  }

.bloco-header {
  display: flex; align-items: center; gap: 0.55rem;
  margin-bottom: 0.65rem;
  font-size: 0.78rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.06em;
}
.bloco-explicacao .bloco-header { color: var(--accent); }
.bloco-analogia   .bloco-header { color: var(--analogy-txt); }
.bloco-exemplo    .bloco-header { color: var(--example-txt); }
.bloco-resumo     .bloco-header { color: var(--summary-txt); }
.bloco-memorizar  .bloco-header { color: var(--memorize-txt); }
.bloco-erros      .bloco-header { color: var(--error-txt); }
.bloco-revisao    .bloco-header { color: var(--review-txt); }

.bloco-analogia  p { color: var(--analogy-txt); }
.bloco-exemplo   p { color: var(--example-txt); }
.bloco-resumo    p { color: var(--summary-txt); }
.bloco-memorizar p { color: var(--memorize-txt); }
.bloco-erros     p { color: var(--error-txt); }
.bloco-revisao   p { color: var(--review-txt); }

.bloco-memorizar ul li,
.bloco-resumo ul li { color: var(--memorize-txt); }
.bloco-resumo ul li  { color: var(--summary-txt); }
.bloco-erros ul li   { color: var(--error-txt); }

.section > p,
.section-intro,
.bloco-explicacao > p,
.bloco-analogia > p,
.bloco-exemplo > p,
.bloco-resumo > p,
.bloco-memorizar > p,
.bloco-erros > p,
.bloco-revisao > p,
.bloco-explicacao > ul,
.bloco-explicacao > ol,
.bloco-analogia > ul,
.bloco-analogia > ol,
.bloco-exemplo > ul,
.bloco-exemplo > ol,
.bloco-resumo > ul,
.bloco-resumo > ol,
.bloco-memorizar > ul,
.bloco-memorizar > ol,
.bloco-erros > ul,
.bloco-erros > ol,
.bloco-revisao > ul,
.bloco-revisao > ol {
  max-width: var(--reading-max);
}

.ped-grid > .card-span-2,
.ped-grid > .mental-flow-card,
.ped-grid > .technical-view-card,
.ped-grid > .final-review-card {
  width: 100%;
}

/* ── Tables ──────────────────────────────────────────── */
.table-wrapper {
  overflow-x: auto;
  margin: 1.25rem 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-weight: 600;
  padding: 0.7rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
td {
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  vertical-align: top;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg-tertiary); }

/* ── Section checkbox ────────────────────────────────── */
.section-check {
  display: flex; align-items: center; gap: 0.4rem;
  cursor: pointer; font-size: 0.78rem; color: var(--text-muted);
  user-select: none;
  padding: 0.28rem 0.6rem;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  transition: all var(--transition);
  white-space: nowrap;
}
.section-check:hover { border-color: var(--accent); color: var(--accent); }
.section-check.checked { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }
.section-check input { display: none; }

.section-state-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: -0.1rem 0 1rem;
}
.section-state-btn {
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-size: 0.74rem;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all var(--transition);
}
.section-state-btn:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}
.section-state-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Fav button ──────────────────────────────────────── */
.fav-btn {
  background: none; border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.28rem 0.5rem;
  cursor: pointer; color: var(--text-muted);
  font-size: 0.95rem; line-height: 1;
  transition: all var(--transition);
}
.fav-btn:hover { border-color: #f59e0b; color: #f59e0b; }
.fav-btn.active { background: rgba(245,158,11,0.12); border-color: #f59e0b; color: #f59e0b; }

/* ── Divider ─────────────────────────────────────────── */
.divider { height: 1px; background: var(--border); margin: 2.5rem 0; }

/* ── Back to top ─────────────────────────────────────── */
.back-to-top {
  position: fixed; bottom: 2rem; right: 2rem;
  background: var(--accent); color: #fff;
  border: none; border-radius: 50%;
  width: 44px; height: 44px;
  cursor: pointer; font-size: 1.2rem;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow);
  opacity: 0; transform: translateY(20px);
  transition: opacity var(--transition), transform var(--transition), background-color var(--transition);
  z-index: 200; pointer-events: none;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: all; }
.back-to-top:hover { background: var(--accent-hover); }

/* ── Overlay (mobile) ────────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 99;
  opacity: 0; pointer-events: none;
  transition: opacity var(--transition-slow);
}

/* ── Search highlight ────────────────────────────────── */
mark.search-hl {
  background: rgba(245,158,11,0.35);
  color: inherit; border-radius: 2px; padding: 0 2px;
}

/* ── Animations ──────────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}

/* ── Module progress bar ─────────────────────────────── */
.module-progress {
  margin-bottom: 1.5rem;
  padding: 0.9rem 1.2rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.mp-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 0.55rem;
}
.mp-label { font-size: 0.8rem; color: var(--text-muted); }
.mp-pct { font-size: 0.8rem; color: var(--accent); font-weight: 600; }
.mp-bar { height: 6px; background: var(--bg-tertiary); border-radius: 3px; overflow: hidden; }
.mp-fill {
  height: 100%; background: var(--accent); border-radius: 3px;
  transition: width 0.6s ease; width: 0%;
}

/* ── Learning architecture blocks ───────────────────── */
.lesson-map {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.8rem;
  margin: 1.5rem 0 2rem;
}

.lesson-step {
  background: linear-gradient(180deg, var(--bg-secondary), var(--bg-tertiary));
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.95rem 1rem;
  min-height: 112px;
}

.lesson-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 0.65rem;
}

.lesson-step h3 {
  margin: 0 0 0.35rem;
  font-size: 0.92rem;
  font-family: var(--font-body);
}

.lesson-step p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.section-intro {
  margin: -0.2rem 0 1rem;
  max-width: 60ch;
  color: var(--text-muted);
}

.ped-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.ped-grid > * {
  margin: 0;
}

.ped-grid .card-span-2 {
  grid-column: 1 / -1;
}

.concept-card,
.why-it-matters-card,
.analogy-card,
.technical-view-card,
.common-mistake-card,
.mental-flow-card,
.cyber-connection-card,
.quick-quiz-card,
.explain-own-words-card,
.final-review-card {
  position: relative;
}

.card-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.6rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.bloco-explicacao .card-kicker,
.bloco-explicacao .retrieval-label {
  color: var(--accent);
}

.bloco-analogia .card-kicker,
.bloco-analogia .retrieval-label {
  color: var(--analogy-txt);
}

.bloco-exemplo .card-kicker,
.bloco-exemplo .retrieval-label {
  color: var(--example-txt);
}

.bloco-resumo .card-kicker,
.bloco-resumo .retrieval-label {
  color: var(--summary-txt);
}

.bloco-memorizar .card-kicker,
.bloco-memorizar .retrieval-label {
  color: var(--memorize-txt);
}

.bloco-erros .card-kicker,
.bloco-erros .retrieval-label {
  color: var(--error-txt);
}

.bloco-revisao .card-kicker,
.bloco-revisao .retrieval-label {
  color: var(--review-txt);
}

.card-title {
  font-size: 1.02rem;
  margin: 0 0 0.5rem;
  font-family: var(--font-body);
  font-weight: 700;
}

.card-caption {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
}

.comparison-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.7rem;
  margin-top: 0.9rem;
}

.comparison-chip {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.7rem 0.8rem;
}

[data-theme="light"] .comparison-chip {
  background: rgba(15,17,23,0.02);
}

.comparison-chip strong {
  display: block;
  margin-bottom: 0.18rem;
  font-size: 0.82rem;
}

.comparison-chip span {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.flow-list {
  list-style: none;
  padding: 0;
  margin: 0.9rem 0 0;
  display: grid;
  gap: 0.7rem;
}

.flow-list li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 0.75rem;
  align-items: start;
  margin: 0;
}

.flow-step {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid var(--accent);
}

.flow-list strong {
  display: block;
  margin-bottom: 0.15rem;
}

.retrieval-box {
  margin-top: 0.95rem;
  padding-top: 0.9rem;
  border-top: 1px dashed var(--border);
}

.retrieval-label {
  display: block;
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 0.35rem;
}

.retrieval-box p:last-child {
  margin-bottom: 0;
}

.review-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1rem 0 0;
}

.review-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 0.78rem;
  line-height: 1.2;
}

.mini-callout {
  margin-top: 0.8rem;
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-xs);
  border: 1px dashed var(--border);
  background: rgba(255,255,255,0.03);
}

[data-theme="light"] .mini-callout {
  background: rgba(15,17,23,0.025);
}

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 768px) {
  .sidebar { position: fixed; left: 0; top: 0; z-index: 100; transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay { display: block; }
  .sidebar-overlay.visible { opacity: 1; pointer-events: all; }
  .hamburger { display: flex; }
  .article-wrapper { padding: 1.5rem 1.25rem 3rem; }
  .topbar { padding: 0.7rem 1.25rem; }
  .page-title { font-size: 1.75rem; }
  h2 { font-size: 1.35rem; }
  h3 { font-size: 1.1rem; }
  .back-to-top { bottom: 1.25rem; right: 1.25rem; }
  .section-header { flex-direction: column; align-items: flex-start; }
  .section-actions { flex-wrap: wrap; }
  .ped-grid { grid-template-columns: 1fr; }
  .ped-grid .card-span-2 { grid-column: auto; }
  .lesson-map { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .article-wrapper { padding: 1.2rem 0.9rem 2.5rem; }
  .page-title { font-size: 1.5rem; }
  .breadcrumbs { font-size: 0.75rem; }
  .lesson-map { grid-template-columns: 1fr; }
}

/* ── Glossary tooltips ───────────────────────────────── */
.glossary-term {
  border-bottom: 1px dashed var(--accent);
  cursor: help;
  color: inherit;
  transition: color var(--transition);
}
.glossary-term:hover { color: var(--accent); }

.glossary-tooltip {
  position: absolute;
  z-index: 500;
  width: 280px;
  background: var(--bg-secondary);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem;
  box-shadow: var(--shadow);
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.18s ease, transform 0.18s ease;
}
.glossary-tooltip.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}
.gt-term {
  display: block;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}
.gt-def { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.5; }

.glossary-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: min(420px, 100vw);
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  z-index: 210;
  padding: 1.15rem;
  overflow-y: auto;
}
.glossary-drawer.visible { transform: translateX(0); }
.glossary-drawer-close {
  margin-left: auto;
  display: block;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: 999px;
  width: 36px;
  height: 36px;
  cursor: pointer;
}
.glossary-drawer-kicker {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-top: 0.8rem;
  font-weight: 700;
}
.glossary-drawer h3 { margin: 0.35rem 0 0.7rem; }
.glossary-drawer-block {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.glossary-drawer-block strong {
  display: block;
  margin-bottom: 0.4rem;
}

/* ── PWA install button ──────────────────────────────── */
.pwa-install {
  display: none;
  align-items: center; gap: 0.4rem;
  background: var(--accent-dim); color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.8rem;
  cursor: pointer; font-size: 0.82rem;
  font-family: var(--font-body);
  transition: all var(--transition);
}
.pwa-install.show { display: flex; }
.pwa-install:hover { background: var(--accent); color: #fff; }

/* ── Offline badge ───────────────────────────────────── */
.offline-badge {
  display: none;
  align-items: center; gap: 0.4rem;
  font-size: 0.75rem; color: var(--text-muted);
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
}
body.is-offline .offline-badge { display: flex; }

/* ── SM-2 rating buttons ─────────────────────────────── */
.fc-rating {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.9rem;
}
.fc-rating.show { display: flex; }
.fc-rating-label {
  font-size: 0.75rem; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.05em;
}
.fc-rating-btns { display: flex; gap: 0.5rem; flex-wrap: wrap; justify-content: center; }
.fc-rate-btn {
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid;
  cursor: pointer; font-size: 0.82rem;
  font-family: var(--font-body); font-weight: 500;
  transition: all var(--transition);
}
.fc-rate-btn.forgot  { border-color: var(--error-bdr);   background: var(--error-bg);   color: var(--error-txt);   }
.fc-rate-btn.hard    { border-color: var(--memorize-bdr); background: var(--memorize-bg); color: var(--memorize-txt); }
.fc-rate-btn.good    { border-color: var(--example-bdr); background: var(--example-bg); color: var(--example-txt); }
.fc-rate-btn.easy    { border-color: var(--accent);       background: var(--accent-dim);  color: var(--accent);      }
.fc-rate-btn:hover { filter: brightness(1.15); transform: translateY(-1px); }

.fc-due-badge {
  display: inline-flex; align-items: center; gap: 0.3rem;
  font-size: 0.72rem; padding: 0.15rem 0.5rem;
  background: var(--accent-dim); color: var(--accent);
  border-radius: var(--radius-xs);
  font-weight: 600;
}
.fc-sr-info {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 0.75rem; color: var(--text-muted);
  margin-top: 0.5rem; padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}
.fc-mode-toggle {
  background: var(--bg-tertiary); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 0.3rem 0.7rem;
  cursor: pointer; font-size: 0.78rem; color: var(--text-secondary);
  font-family: var(--font-body);
  transition: all var(--transition);
}
.fc-mode-toggle.active { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }

/* ── Quiz history chart ──────────────────────────────── */
.quiz-history {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}
.qh-label { font-size: 0.72rem; color: var(--text-muted); margin-bottom: 0.45rem; text-transform: uppercase; letter-spacing: 0.05em; }
.qh-bars { display: flex; align-items: flex-end; gap: 4px; height: 40px; }
.qh-bar-wrap { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.qh-bar {
  width: 22px; min-height: 4px;
  border-radius: 2px 2px 0 0;
  background: var(--accent-dim);
  border: 1px solid var(--accent);
  transition: height 0.4s ease;
}
.qh-bar.pct100 { background: var(--example-bdr); border-color: var(--example-bdr); }
.qh-bar.pct66  { background: var(--accent);       border-color: var(--accent); }
.qh-pct { font-size: 0.62rem; color: var(--text-muted); }

/* ── Share button ────────────────────────────────────── */
.share-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.28rem 0.5rem;
  cursor: pointer;
  color: var(--text-muted);
  line-height: 1;
  display: flex;
  align-items: center;
  transition: all var(--transition);
  flex-shrink: 0;
}
.share-btn:hover { border-color: var(--accent); color: var(--accent); }
.share-btn svg { display: block; }

/* ── Toast notification ──────────────────────────────── */
.rw-toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(1rem);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 1.1rem;
  font-size: 0.875rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: var(--shadow);
  opacity: 0;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 9999;
  white-space: nowrap;
  pointer-events: none;
}
.rw-toast--show { opacity: 1; transform: translateX(-50%) translateY(0); }
.rw-toast-icon { font-size: 1rem; }
.rw-toast--action {
  white-space: normal;
  max-width: min(92vw, 460px);
  align-items: stretch;
  flex-direction: column;
  pointer-events: auto;
}
.rw-toast-action-copy { line-height: 1.45; }
.rw-toast-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.rw-toast-action-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  color: var(--text-primary);
  font-size: 0.76rem;
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  cursor: pointer;
}
.rw-toast-action-btn:hover {
  border-color: rgba(79,142,247,0.45);
  color: var(--accent);
}

.rw-cache-refresh-wrap,
.rw-cache-refresh-standalone {
  margin-top: 0.9rem;
  display: flex;
  justify-content: center;
}
.rw-cache-refresh {
  appearance: none;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  color: var(--text-muted);
  font-size: 0.76rem;
  line-height: 1.2;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background var(--transition), opacity var(--transition);
}
.rw-cache-refresh:hover {
  color: var(--text-primary);
  border-color: rgba(79,142,247,0.45);
  background: rgba(79,142,247,0.08);
}
.rw-cache-refresh:disabled {
  opacity: 0.65;
  cursor: wait;
}
.rw-cache-refresh-standalone {
  padding: 1.25rem 1rem 2rem;
}
.sidebar-cache-link {
  margin-top: 0.7rem;
  width: 100%;
  appearance: none;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  color: var(--text-muted);
  font-size: 0.72rem;
  border-radius: 10px;
  padding: 0.55rem 0.7rem;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.sidebar-cache-link:hover {
  color: var(--text-primary);
  border-color: rgba(79,142,247,0.45);
  background: rgba(79,142,247,0.08);
}

/* ── Site footer (cache button host) ─────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.25rem 1rem 2rem;
  margin-top: 2rem;
  display: flex;
  justify-content: center;
}

/* ── Progress animations ─────────────────────────────── */
@keyframes sectionCheckPop {
  0%   { transform: scale(1); }
  35%  { transform: scale(1.08); }
  65%  { transform: scale(0.96); }
  100% { transform: scale(1); }
}
.section-check--pop { animation: sectionCheckPop 0.35s ease; }

@keyframes progressPulse {
  0%   { filter: brightness(1); }
  40%  { filter: brightness(1.35); }
  100% { filter: brightness(1); }
}
.progress-fill--pulse { animation: progressPulse 0.6s ease; }

/* ── Floating TOC ────────────────────────────────────── */
.rw-toc-float {
  position: fixed;
  right: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 190;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
}
.rw-toc-toggle {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  line-height: 1;
}
.rw-toc-toggle:hover,
.rw-toc-toggle.open { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }
.rw-toc-panel {
  position: absolute;
  right: 2.75rem;
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.75rem 0.875rem;
  min-width: 190px;
  max-width: 240px;
  display: none;
  animation: rw-toc-in 0.15s ease;
}
@keyframes rw-toc-in { from { opacity:0; transform:translateX(8px) translateY(-50%); } to { opacity:1; transform:translateX(0) translateY(-50%); } }
.rw-toc-panel.open { display: block; }
.rw-toc-heading { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin: 0 0 0.5rem; font-weight: 600; }
.rw-toc-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.15rem; }
.rw-toc-list a { font-size: 0.8rem; color: var(--text-secondary); text-decoration: none; line-height: 1.4; padding: 0.2rem 0.3rem; display: block; border-radius: 4px; transition: background var(--transition), color var(--transition); }
.rw-toc-list a:hover { color: var(--accent); background: var(--accent-dim); }
.rw-toc-list a.rw-toc-active { color: var(--accent); font-weight: 600; background: var(--accent-dim); }

/* ── Module completion modal ─────────────────────────── */
.rw-completion-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.65);
  z-index: 1100; display: flex; align-items: center; justify-content: center;
  animation: rw-fade-in 0.25s ease;
}
@keyframes rw-fade-in { from { opacity:0; } to { opacity:1; } }
.rw-completion-card {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2.5rem 2rem; max-width: 400px;
  width: 90%; text-align: center; box-shadow: var(--shadow);
  animation: rw-card-pop 0.4s cubic-bezier(0.34,1.56,0.64,1);
}
@keyframes rw-card-pop { from { transform:scale(0.82); opacity:0; } to { transform:scale(1); opacity:1; } }
.rw-completion-icon { font-size: 3.5rem; line-height: 1; margin-bottom: 0.75rem; }
.rw-completion-title { font-family: var(--font-heading); font-size: 1.4rem; font-weight: 700; color: var(--text-primary); margin: 0 0 0.4rem; }
.rw-completion-sub { color: var(--text-secondary); font-size: 0.9rem; margin: 0 0 1.5rem; }
.rw-completion-actions { display: flex; gap: 0.6rem; justify-content: center; flex-wrap: wrap; }
.rw-completion-next { background: var(--accent); color: #fff; border: none; border-radius: var(--radius-sm); padding: 0.6rem 1.1rem; font-weight: 600; font-size: 0.875rem; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; transition: background var(--transition); }
.rw-completion-next:hover { background: var(--accent-hover); }
.rw-completion-close { background: var(--bg-tertiary); color: var(--text-secondary); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.6rem 1.1rem; font-size: 0.875rem; cursor: pointer; transition: background var(--transition); }
.rw-completion-close:hover { background: var(--bg-secondary); }

/* ── Confetti ────────────────────────────────────────── */
.rw-confetti-canvas { position: fixed; inset: 0; pointer-events: none; z-index: 1099; }

/* ── PWA install banner ──────────────────────────────── */
.rw-install-banner {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--bg-secondary); border-top: 1px solid var(--border);
  padding: 0.8rem 1.25rem; display: flex; align-items: center;
  gap: 0.75rem; z-index: 500;
  box-shadow: 0 -4px 16px rgba(0,0,0,0.25);
  animation: rw-banner-up 0.35s ease;
}
.rw-install-banner[hidden] { display: none; }
@keyframes rw-banner-up { from { transform: translateY(100%); } to { transform: translateY(0); } }
.rw-install-icon { font-size: 1.3rem; flex-shrink: 0; }
.rw-install-text { flex: 1; font-size: 0.85rem; color: var(--text-secondary); }
.rw-install-text strong { color: var(--text-primary); }
.rw-install-cta { background: var(--accent); color: #fff; border: none; border-radius: var(--radius-sm); padding: 0.5rem 1rem; font-weight: 600; font-size: 0.85rem; cursor: pointer; white-space: nowrap; transition: background var(--transition); }
.rw-install-cta:hover { background: var(--accent-hover); }
.rw-install-x { background: none; border: none; color: var(--text-muted); cursor: pointer; padding: 0.3rem; font-size: 1.1rem; line-height: 1; transition: color var(--transition); }
.rw-install-x:hover { color: var(--text-primary); }

/* ── Pomodoro timer widget ───────────────────────────── */
.rw-pomodoro {
  position: fixed; bottom: 5.5rem; right: 2rem;
  z-index: 300; display: flex; flex-direction: column; align-items: flex-end; gap: 0.5rem;
}
.rw-pom-panel {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 1.25rem 1rem; width: 210px;
  display: none; flex-direction: column; align-items: center; gap: 0.65rem;
  animation: rw-toc-in 0.15s ease;
}
.rw-pom-panel.open { display: flex; }
.rw-pom-mode-label { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); font-weight: 600; }
.rw-pom-time {
  font-family: var(--font-heading); font-size: 2.25rem; font-weight: 700;
  color: var(--text-primary); letter-spacing: 0.02em; line-height: 1;
  transition: color 0.3s ease;
}
.rw-pom-time.rw-pom-break { color: #22c55e; }
.rw-pom-sessions { font-size: 0.72rem; color: var(--text-muted); }
.rw-pom-track { width: 100%; height: 3px; background: var(--border); border-radius: 2px; overflow: hidden; }
.rw-pom-fill { height: 100%; background: var(--accent); border-radius: 2px; width: 0%; transition: width 1s linear; }
.rw-pom-fill.rw-pom-fill-break { background: #22c55e; }
.rw-pom-btns { display: flex; gap: 0.5rem; }
.rw-pom-btn { background: var(--bg-tertiary); border: 1px solid var(--border); border-radius: var(--radius-xs); color: var(--text-secondary); padding: 0.38rem 0.75rem; font-size: 0.8rem; cursor: pointer; transition: background var(--transition), border-color var(--transition), color var(--transition); }
.rw-pom-btn:hover { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }
.rw-pom-btn.rw-pom-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.rw-pom-btn.rw-pom-primary:hover { background: var(--accent-hover); }
.rw-pom-notif-btn { display: block; width: 100%; margin-top: 0.5rem; font-size: 0.75rem; }
.rw-pom-fab {
  width: 3rem; height: 3rem; border-radius: 50%;
  background: var(--bg-tertiary); border: 1px solid var(--border);
  color: var(--text-secondary); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.15rem; box-shadow: var(--shadow-sm);
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.rw-pom-fab:hover { background: var(--bg-secondary); border-color: var(--accent); color: var(--accent); }
.rw-pom-fab.rw-pom-running { border-color: var(--accent); background: var(--accent-dim); color: var(--accent); }
.rw-pom-fab.rw-pom-pause  { border-color: #22c55e; background: rgba(34,197,94,0.1); color: #22c55e; }

/* ── Bottom article nav ──────────────────────────────── */
.rw-article-nav {
  display: flex; justify-content: space-between; align-items: stretch;
  margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border);
  gap: 1rem;
}
.rw-article-nav-slot { flex: 1; }
.rw-article-nav-prev { text-align: left; }
.rw-article-nav-next { text-align: right; }
.rw-article-nav a {
  display: inline-flex; flex-direction: column; gap: 0.2rem;
  text-decoration: none; padding: 0.75rem; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg-secondary);
  transition: border-color var(--transition), background var(--transition);
  max-width: 100%;
}
.rw-article-nav a:hover { border-color: var(--accent); background: var(--accent-dim); }
.rw-article-nav-kicker { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); }
.rw-article-nav-title { font-weight: 600; font-size: 0.875rem; color: var(--text-primary); }

/* ── Diagram blocks ──────────────────────────────────── */
.rw-diagram {
  margin: 1.5rem 0; padding: 1.25rem 1.5rem;
  background: var(--bg-tertiary); border: 1px solid var(--border);
  border-radius: var(--radius); overflow-x: auto;
}
.rw-diagram-label { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 1rem; display: block; font-weight: 600; }
.rw-diagram svg { display: block; max-width: 100%; height: auto; margin: 0 auto; }

/* ── Section anchor links ────────────────────────────── */
.rw-anchor-link {
  display: inline-flex;
  align-items: center;
  margin-left: 0.45rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.8em;
  font-family: var(--font-body);
  font-weight: 400;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease;
  vertical-align: middle;
  line-height: 1;
  user-select: none;
}
h2:hover .rw-anchor-link,
h2:focus-within .rw-anchor-link { opacity: 1; }
.rw-anchor-link:hover { color: var(--accent); }

/* ── Module card badge ───────────────────────────────── */
.module-card { position: relative; }
.mc-badge {
  position: absolute;
  top: 0.65rem;
  right: 0.65rem;
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.18rem 0.5rem;
  background: rgba(34,197,94,0.15);
  color: #22c55e;
  border: 1px solid rgba(34,197,94,0.35);
  border-radius: 20px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  pointer-events: none;
  animation: rw-badge-in 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
@keyframes rw-badge-in { from { transform:scale(0.6); opacity:0; } to { transform:scale(1); opacity:1; } }

/* ── Section personal notes ──────────────────────────── */
.rw-notes-wrap {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-subtle);
}
.rw-notes-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.78rem;
  cursor: pointer;
  padding: 0;
  transition: color var(--transition);
  font-family: var(--font-body);
}
.rw-notes-toggle:hover { color: var(--accent); }
.rw-notes-toggle.has-notes { color: var(--accent); }
.rw-notes-toggle-icon { font-size: 0.9rem; }
.rw-notes-body { display: none; margin-top: 0.5rem; }
.rw-notes-body.open { display: block; }
.rw-notes-textarea {
  width: 100%;
  min-height: 80px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  line-height: 1.6;
  padding: 0.6rem 0.75rem;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition);
  box-sizing: border-box;
}
.rw-notes-textarea:focus { border-color: var(--accent); }
.rw-notes-textarea::placeholder { color: var(--text-muted); }
.rw-notes-hint { font-size: 0.7rem; color: var(--text-muted); margin-top: 0.3rem; }

/* ── Reduced motion ──────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .fc-card { transition: none !important; }
  .rw-confetti-canvas { display: none !important; }
}

/* ── Hide floating widgets on mobile to avoid clutter ── */
@media (max-width: 680px) {
  .rw-toc-float { display: none; }
  .rw-pomodoro { bottom: 4.5rem; right: 1rem; }
  .rw-pom-panel { width: 185px; }
}

/* ── Print / PDF stylesheet ──────────────────────────── */
@media print {
  /* hide interactive chrome */
  .sidebar, .sidebar-overlay, .topbar, .back-to-top,
  .pwa-install, .section-actions, .section-state-group,
  .flashcard-wrap, .quiz-wrap, .module-progress,
  .share-btn, .fav-btn, .rw-toast, .skip-link,
  .glossary-trigger, .glossary-drawer,
  .home-section:has(#moduleGrid), #favoritos, #progresso,
  [data-flashcard-set], [data-quiz-set] { display: none !important; }

  /* layout: full width, no sidebar gap */
  .app-layout { display: block; }
  .main-content { margin-left: 0 !important; padding: 0 !important; }
  .article-wrapper { max-width: 100%; padding: 0 1cm !important; }

  /* typography for paper */
  body { font-size: 11pt; color: #111; background: #fff !important; line-height: 1.6; }
  h1   { font-size: 22pt; color: #000; }
  h2   { font-size: 16pt; color: #000; margin-top: 1.6em; page-break-after: avoid; }
  h3   { font-size: 13pt; color: #000; page-break-after: avoid; }
  p, li { color: #111; }

  /* teaching blocks: border instead of color fill */
  .analogy-block, .example-block, .memorize-block,
  .summary-block, .error-block, .review-block {
    background: #f8f8f8 !important;
    border-left-width: 3px !important;
    padding: 0.6rem 0.8rem !important;
    page-break-inside: avoid;
  }

  /* tables */
  table { border-collapse: collapse; width: 100%; font-size: 10pt; }
  th, td { border: 1px solid #bbb; padding: 0.25rem 0.4rem; }
  th { background: #eee !important; }

  /* links: show URL inline (skip anchors) */
  a[href]:not([href^="#"])::after {
    content: " (" attr(href) ")";
    font-size: 0.75em;
    color: #555;
  }
  a[href^="http"]::after { content: " (" attr(href) ")"; }

  /* page breaks */
  .section { page-break-inside: avoid; }

  /* code */
  code, pre { background: #f0f0f0 !important; color: #111 !important; }

  /* personal notes: show when there's content */
  .rw-notes-wrap:has(.has-notes) { display: block !important; page-break-inside: avoid; }
  .rw-notes-toggle { display: none !important; }
  .rw-notes-body { display: block !important; max-height: none !important; overflow: visible !important; }
  .rw-notes-textarea {
    display: block !important;
    resize: none !important;
    border: 1px solid #ccc !important;
    background: #f9f9f9 !important;
    color: #111 !important;
    font-size: 9pt;
    width: 100%;
    min-height: 2rem;
    padding: 0.4rem !important;
  }
  .rw-notes-hint { display: none !important; }
}