/* ==========================================================================
   Organização Narro — Design System & Estilos
   Inspirado no ecossistema GNOME / Libadwaita (Adwaita Theme)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Variáveis de Tema (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Paleta GNOME Libadwaita Padrão (Dark Theme Default) */
  --accent-blue: #3584e4;
  --accent-hover: #1c71d8;
  --accent-active: #15539e;
  --accent-subtle: rgba(53, 132, 228, 0.15);
  --accent-border: rgba(53, 132, 228, 0.35);

  --accent-green: #33d17a;
  --accent-yellow: #f6d32d;
  --accent-red: #e01b24;
  --accent-purple: #9141ac;
  --accent-teal: #21a499;

  /* Superfícies e Fundos (Dark) */
  --bg-base: #1e1e1e;
  --bg-surface: #242424;
  --bg-elevated: #2f2f2f;
  --bg-card: #272727;
  --bg-card-hover: #2d2d2d;
  --bg-header: rgba(30, 30, 30, 0.85);
  --bg-modal: rgba(15, 15, 15, 0.88);
  --code-bg: #151515;

  /* Tipografia & Contraste (Dark) */
  --text-primary: #ffffff;
  --text-secondary: #c0bfbc;
  --text-muted: #8a8886;
  --text-inverse: #1e1e1e;

  /* Bordas e Divisores (Dark) */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.14);
  --border-hover: rgba(255, 255, 255, 0.22);

  /* Sombras de Elevação (Libadwaita) */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 24px rgba(53, 132, 228, 0.25);

  /* Cantos Arredondados (Squircles GNOME) */
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 9999px;

  /* Tipografia */
  --font-family: system-ui, "Cantarell", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Liberation Mono", Menlo, Consolas, monospace;

  /* Transições Suaves */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   Tema Claro (Light Theme)
   -------------------------------------------------------------------------- */
[data-theme="light"] {
  --bg-base: #f6f8fa;
  --bg-surface: #ffffff;
  --bg-elevated: #f0f2f5;
  --bg-card: #ffffff;
  --bg-card-hover: #fcfcfc;
  --bg-header: rgba(246, 248, 250, 0.88);
  --bg-modal: rgba(255, 255, 255, 0.88);
  --code-bg: #22252a;

  --text-primary: #1c1c1c;
  --text-secondary: #5e5c64;
  --text-muted: #86848d;
  --text-inverse: #ffffff;

  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-medium: rgba(0, 0, 0, 0.14);
  --border-hover: rgba(0, 0, 0, 0.24);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 24px rgba(53, 132, 228, 0.15);
}

/* --------------------------------------------------------------------------
   2. Reset & Estilos Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  color-scheme: dark light;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

a:hover {
  color: var(--accent-hover);
}

ul {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Acessibilidade de Foco */
:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

/* Skip link acessível */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--accent-blue);
  color: #ffffff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 20px;
}

/* --------------------------------------------------------------------------
   3. Layout Container & Utilitários
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
  position: relative;
}

.section-divider {
  height: 1px;
  background: radial-gradient(circle, var(--border-medium) 0%, transparent 80%);
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

.text-center {
  text-align: center;
}

.text-muted {
  color: var(--text-muted);
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent-blue) 0%, #62a0ea 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* --------------------------------------------------------------------------
   4. Botões & Badges
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
}

.btn-xs {
  padding: 5px 10px;
  font-size: 0.78rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn-block {
  width: 100%;
}

.btn-primary {
  background-color: var(--accent-blue);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(53, 132, 228, 0.3);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(53, 132, 228, 0.4);
}

.btn-secondary {
  background-color: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-outline:hover {
  background-color: var(--bg-elevated);
  border-color: var(--border-hover);
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: scale(1.05);
}

/* Badges e Pílulas */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.badge-blue {
  background: rgba(53, 132, 228, 0.15);
  color: var(--accent-blue);
  border: 1px solid rgba(53, 132, 228, 0.3);
}

.badge-purple {
  background: rgba(145, 65, 172, 0.15);
  color: #c061cb;
  border: 1px solid rgba(145, 65, 172, 0.3);
}

.badge-green {
  background: rgba(51, 209, 122, 0.15);
  color: #57e389;
  border: 1px solid rgba(51, 209, 122, 0.3);
}

.section-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent-blue);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  margin-bottom: 16px;
}

/* --------------------------------------------------------------------------
   5. Cabeçalho & Navegação Fixa
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--bg-header);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-normal);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
  border-bottom-color: var(--border-medium);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  border-radius: var(--radius-sm);
  transition: transform var(--transition-fast);
}

.brand:hover .brand-logo {
  transform: rotate(5deg) scale(1.05);
}

.brand-text {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.main-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.92rem;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-elevated);
}

.nav-link.active {
  color: var(--accent-blue);
  background-color: var(--accent-subtle);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Alternador de Tema */
#theme-toggle .icon-sun {
  display: none;
}
#theme-toggle .icon-moon {
  display: block;
}

[data-theme="light"] #theme-toggle .icon-sun {
  display: block;
  color: #ff9800;
}
[data-theme="light"] #theme-toggle .icon-moon {
  display: none;
}

.mobile-only {
  display: none;
}

/* --------------------------------------------------------------------------
   6. Seção Hero (Apresentação Narro)
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 100px 0 80px;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, rgba(53, 132, 228, 0.08) 0%, transparent 70%);
}

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-blue);
  box-shadow: 0 0 8px var(--accent-blue);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.6; }
}

.hero-logo-wrapper {
  margin-bottom: 20px;
  position: relative;
}

.hero-main-logo {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-glow), var(--shadow-md);
  transition: transform var(--transition-slow);
}

.hero-main-logo:hover {
  transform: translateY(-6px) scale(1.03);
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -1.2px;
  color: var(--text-primary);
  margin-bottom: 20px;
  max-width: 850px;
}

.hero-description {
  font-size: 1.2rem;
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 760px;
  margin-bottom: 36px;
}

.hero-pillars {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
  max-width: 860px;
}

.pillar-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.pillar-item:hover {
  border-color: var(--border-hover);
  background-color: var(--bg-elevated);
  transform: translateY(-2px);
}

.pillar-icon {
  color: var(--accent-blue);
  display: flex;
  align-items: center;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

/* --------------------------------------------------------------------------
   7. Cards de Showcase dos Aplicativos (NarroPDF e Narro RSA)
   -------------------------------------------------------------------------- */
.app-section {
  padding: 90px 0;
}

.app-header-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px 40px;
  margin-bottom: 36px;
  box-shadow: var(--shadow-sm);
}

.app-brand-row {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 18px;
}

.app-icon-wrapper {
  flex-shrink: 0;
}

.app-icon {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.app-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.app-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.6px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.app-subtitle {
  font-size: 1.1rem;
  color: var(--accent-blue);
  font-weight: 500;
}

.app-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Moldura de Janela (Mockup Adwaita) */
.showcase-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-bottom: 40px;
}

.showcase-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.window-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.window-controls .dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.window-controls .dot.close { background-color: #e01b24; }
.window-controls .dot.minimize { background-color: #f6d32d; }
.window-controls .dot.maximize { background-color: #33d17a; }

.window-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.showcase-body {
  position: relative;
  overflow: hidden;
  background-color: #121212;
  cursor: zoom-in;
}

.showcase-img {
  width: 100%;
  height: auto;
  transition: transform var(--transition-slow);
}

.showcase-body:hover .showcase-img {
  transform: scale(1.015);
}

/* Abas de Showcase (Narro RSA) */
.showcase-tabs-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 12px;
}

.tab-buttons {
  display: inline-flex;
  background: var(--bg-surface);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--accent-blue);
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(53, 132, 228, 0.35);
}

.showcase-tab-content {
  position: relative;
  background-color: #121212;
}

.tab-pane {
  display: none;
  cursor: zoom-in;
}

.tab-pane.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

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

/* --------------------------------------------------------------------------
   8. Grid de Funcionalidades (Features)
   -------------------------------------------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 36px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  border-color: var(--border-hover);
  background-color: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon.icon-blue { background: rgba(53, 132, 228, 0.15); color: var(--accent-blue); }
.feature-icon.icon-teal { background: rgba(33, 164, 153, 0.15); color: var(--accent-teal); }
.feature-icon.icon-yellow { background: rgba(246, 211, 45, 0.15); color: #e5a50a; }
.feature-icon.icon-purple { background: rgba(145, 65, 172, 0.15); color: #c061cb; }
.feature-icon.icon-red { background: rgba(224, 27, 36, 0.15); color: #f66151; }
.feature-icon.icon-green { background: rgba(51, 209, 122, 0.15); color: #33d17a; }

.feature-card h3 {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   9. Atalhos de Teclado & Teclas Adwaita
   -------------------------------------------------------------------------- */
.shortcuts-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 36px;
}

.shortcuts-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.shortcuts-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.shortcut-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-elevated);
  padding: 8px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  color: var(--text-secondary);
}

kbd {
  display: inline-block;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-primary);
  background-color: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xs);
  box-shadow: 0 2px 0 var(--border-medium);
  line-height: 1.2;
}

/* Tabela de Atalhos GNOME */
.shortcuts-table-wrapper {
  overflow-x: auto;
}

.shortcuts-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.shortcuts-table th,
.shortcuts-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.shortcuts-table th {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.shortcuts-table td {
  font-size: 0.95rem;
}

.shortcuts-table code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-blue);
  background: var(--bg-elevated);
  padding: 4px 8px;
  border-radius: var(--radius-xs);
}

/* --------------------------------------------------------------------------
   10. Cartão de Download & Ações de Release
   -------------------------------------------------------------------------- */
.download-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px 40px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  transition: all var(--transition-normal);
}

.download-card:hover {
  border-color: var(--border-hover);
  background-color: var(--bg-card-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.download-info {
  max-width: 550px;
}

.download-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent-green);
  background: rgba(51, 209, 122, 0.12);
  border: 1px solid rgba(51, 209, 122, 0.25);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 10px;
}

.download-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
  letter-spacing: -0.3px;
}

.download-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.download-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.download-btn {
  box-shadow: 0 4px 16px rgba(53, 132, 228, 0.35);
}

.download-btn:hover {
  box-shadow: 0 6px 20px rgba(53, 132, 228, 0.5);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   11. Seletor de Idiomas (GNOME / Adwaita Dropdown)
   -------------------------------------------------------------------------- */
.lang-selector-wrapper {
  position: relative;
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 700;
}

.lang-code-text {
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.icon-chevron {
  transition: transform var(--transition-fast);
}

.lang-btn[aria-expanded="true"] .icon-chevron {
  transform: rotate(180deg);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 6px;
  box-shadow: var(--shadow-lg);
  z-index: 150;
  display: none;
  flex-direction: column;
  gap: 4px;
}

.lang-dropdown.open {
  display: flex;
  animation: fadeInDown 0.18s ease;
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.lang-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  text-align: left;
}

.lang-option:hover {
  background-color: var(--bg-elevated);
  color: var(--text-primary);
}

.lang-option.active {
  background-color: var(--accent-subtle);
  color: var(--accent-blue);
  font-weight: 700;
}

.lang-option-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  background: var(--bg-elevated);
  color: var(--text-muted);
}

.lang-option.active .lang-option-badge {
  background: var(--accent-blue);
  color: #ffffff;
}

.section-heading {
  margin-bottom: 50px;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.8px;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   12. Seção Tecnologias TTS
   -------------------------------------------------------------------------- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.tech-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-normal);
}

.tech-card:hover {
  border-color: var(--border-hover);
  background-color: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.tech-card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}

.tech-card h3 {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.tech-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   13. Seção Sobre a Organização
   -------------------------------------------------------------------------- */
.about-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-md);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 48px;
}

.about-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 18px;
}

.about-stats {
  display: flex;
  gap: 36px;
  margin-top: 32px;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent-blue);
  line-height: 1.1;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.about-illustration {
  display: flex;
  justify-content: center;
}

.illustration-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px 30px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 360px;
  box-shadow: var(--shadow-sm);
}

.about-logo {
  border-radius: var(--radius-xl);
  margin-bottom: 24px;
  box-shadow: var(--shadow-glow);
}

.quote-box {
  border-top: 1px solid var(--border-subtle);
  padding-top: 18px;
}

.quote-text {
  font-size: 0.95rem;
  font-style: italic;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 8px;
}

.quote-author {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-blue);
}

/* Banner de Contribuição */
.contribute-banner {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.contribute-info h4 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.contribute-info p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 650px;
}

/* --------------------------------------------------------------------------
   14. Rodapé (Footer)
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 24px;
  margin-top: auto;
}

.footer-container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-logo {
  border-radius: var(--radius-xs);
}

.footer-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 320px;
}

.footer-heading {
  font-size: 0.92rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-primary);
  letter-spacing: 0.5px;
  margin-bottom: 18px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.92rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-blue);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
}

.footer-bottom-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.back-to-top-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.back-to-top-link:hover {
  color: var(--accent-blue);
}

/* --------------------------------------------------------------------------
   15. Modal Lightbox
   -------------------------------------------------------------------------- */
.lightbox-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.lightbox-modal.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-modal);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.lightbox-content {
  position: relative;
  z-index: 1;
  max-width: 90vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: zoomIn 0.25s ease;
}

@keyframes zoomIn {
  from { transform: scale(0.92); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.lightbox-close {
  position: absolute;
  top: -46px;
  right: 0;
  color: #ffffff;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.2);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.lightbox-close:hover {
  background: var(--accent-red);
  transform: rotate(90deg);
}

.lightbox-image-wrapper {
  background: #000000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.6);
  border: 1px solid var(--border-medium);
}

.lightbox-img {
  max-width: 88vw;
  max-height: 75vh;
  object-fit: contain;
  display: block;
}

.lightbox-caption {
  color: #f1f1f1;
  font-size: 0.95rem;
  font-weight: 500;
  margin-top: 14px;
  text-align: center;
  max-width: 700px;
  background: rgba(0, 0, 0, 0.6);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
}

/* --------------------------------------------------------------------------
   16. Responsividade (Media Queries)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }

  .footer-container {
    grid-template-columns: 1fr 1fr;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .illustration-box {
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: auto;
    padding: 10px 0;
  }

  .header-container {
    height: 54px;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-medium);
    padding: 16px 24px;
    box-shadow: var(--shadow-lg);
  }

  .main-nav.open {
    display: block;
  }

  .main-nav .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .nav-link {
    width: 100%;
    padding: 10px 14px;
  }

  .mobile-only {
    display: inline-flex;
  }

  .header-github span {
    display: none;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-description {
    font-size: 1.05rem;
  }

  .app-header-card {
    padding: 24px;
  }

  .app-brand-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .app-title {
    font-size: 1.8rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .download-card {
    padding: 28px 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  .download-actions {
    width: 100%;
  }

  .download-actions .btn {
    width: 100%;
  }

  .contribute-banner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-container {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom-container {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .about-stats {
    flex-direction: column;
    gap: 16px;
  }
}