/* ==============================================================================
   Francês Adaptativo — Design System "Calme"
   Paleta serena de baixo estímulo visual, pensada para sessões longas de estudo.

   Princípios aplicados:
   - Fundo levemente esverdeado (papel) em vez de branco puro: reduz o glare.
   - Texto em cinza-verde escuro em vez de preto: menor contraste extremo,
     mantendo AA/AAA de legibilidade.
   - Uma única cor de ação (eucalipto) para reduzir carga cognitiva.
   - Cores de erro/alerta dessaturadas: feedback sem gatilho de estresse.
   - Espaçamento generoso e ritmo vertical constante em todas as páginas.
   ============================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Lora:ital,wght@0,400;0,500;0,600;1,400&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* --- Neutros (tema claro — padrão) --- */
  --canvas: #f4f6f2;
  --canvas-tint: #eaeee6;
  --surface: #ffffff;
  --surface-2: #fafbf8;
  --surface-3: #f0f3ec;
  --border: #e2e7db;
  --border-strong: #cfd7c6;

  /* Aliases legados de background */
  --bg-primary: var(--canvas);
  --bg-secondary: var(--surface);
  --bg-surface: var(--surface);
  --bg-surface-hover: var(--surface-3);
  --bg-glass: rgba(63, 122, 104, 0.04);
  --bg-glass-card: var(--surface);
  --bg-card: var(--surface);
  --surface-hover: var(--surface-3);
  --border-color: var(--border);
  --border-color-hover: var(--border-strong);
  --border-color-active: rgba(63, 122, 104, 0.45);
  --overlay: rgba(38, 51, 46, 0.38);

  /* --- Texto --- */
  --text-strong: #24312c;
  --text-primary: #2c3a34;
  --text-secondary: #56655d;
  --text-muted: #8b978f;
  --text-inverse: #ffffff;

  /* --- Marca: eucalipto (calma, crescimento, foco) --- */
  --primary: #3f7a68;
  --primary-hover: #34675a;
  --primary-light: rgba(63, 122, 104, 0.10);
  --primary-glow: rgba(63, 122, 104, 0.18);
  --primary-soft: #e8f1ed;
  --primary-contrast: #ffffff;
  --accent: var(--primary);

  /* --- Secundária: azul empoeirado (serenidade, informação) --- */
  --secondary: #5a7fa0;
  --secondary-hover: #4c6d8c;
  --secondary-light: rgba(90, 127, 160, 0.12);
  --secondary-soft: #eaf0f6;

  /* --- Acento quente: ocre suave (conquista, ofensiva) --- */
  --accent-gold: #b4813c;
  --accent-gold-light: rgba(180, 129, 60, 0.12);
  --accent-warm-soft: #f8f0e2;

  /* --- Estados (dessaturados de propósito) --- */
  --success: #4b8b6c;
  --success-light: rgba(75, 139, 108, 0.12);
  --error: #b0605a;
  --danger: var(--error);
  --error-light: rgba(176, 96, 90, 0.12);
  --warning: #b4813c;
  --warning-light: rgba(180, 129, 60, 0.12);
  --info: #5a7fa0;
  --info-light: rgba(90, 127, 160, 0.12);

  /* --- Níveis CEFR (harmônicos entre si) --- */
  --level-a1: #5d9077;
  --level-a2: #4b8b8b;
  --level-b1: #5a7fa0;
  --level-b2: #75759e;
  --level-c1: #966d91;
  --level-c2: #b4813c;

  /* --- Gradientes suaves --- */
  --grad-primary: linear-gradient(135deg, #4a8a75 0%, #3f7a68 55%, #386f78 100%);
  --grad-card: linear-gradient(160deg, #ffffff 0%, #f7faf5 100%);
  --grad-accent: linear-gradient(135deg, #5a7fa0 0%, #4b8b8b 100%);
  --grad-streak: linear-gradient(135deg, #c99450 0%, #b4813c 100%);
  --grad-calm: radial-gradient(circle at 20% -10%, rgba(75, 139, 139, 0.10), transparent 55%),
               radial-gradient(circle at 85% 0%, rgba(180, 129, 60, 0.08), transparent 50%);

  /* --- Sombras difusas (luz ambiente, sem drama) --- */
  --shadow-xs: 0 1px 2px rgba(36, 49, 44, 0.04);
  --shadow-sm: 0 1px 3px rgba(36, 49, 44, 0.05), 0 1px 2px rgba(36, 49, 44, 0.03);
  --shadow-md: 0 4px 16px rgba(36, 49, 44, 0.07);
  --shadow-lg: 0 14px 34px rgba(36, 49, 44, 0.10);
  --shadow-glow: 0 6px 20px rgba(63, 122, 104, 0.16);
  --shadow-gold: 0 6px 18px rgba(180, 129, 60, 0.16);
  --shadow-focus: 0 0 0 4px var(--primary-glow);
  --blur-glass: blur(10px);

  /* --- Tipografia --- */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Lora', Georgia, 'Times New Roman', serif;
  --font-serif: 'Lora', Georgia, serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* --- Escala de espaçamento (base 4px) --- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 2.5rem;
  --space-8: 3rem;

  /* --- Layout --- */
  --topbar-height: 66px;
  --navrail-height: 52px;
  --header-height: var(--topbar-height);
  --content-max: 1120px;
  --prose-max: 68ch;
  --sidebar-width: 0px;
  --mobile-nav-height: 0px;

  /* --- Raios generosos (percepção de segurança/suavidade) --- */
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 26px;
  --radius-full: 9999px;

  /* --- Transições (lentas o suficiente para não assustar) --- */
  --transition-fast: 150ms cubic-bezier(0.33, 1, 0.68, 1);
  --transition-normal: 240ms cubic-bezier(0.33, 1, 0.68, 1);
  --transition-smooth: 380ms cubic-bezier(0.22, 1, 0.36, 1);
}

/* --- Tema escuro: "noite serena" (nunca preto puro) --- */
[data-theme="dark"] {
  --canvas: #161b19;
  --canvas-tint: #1b2220;
  --surface: #1e2523;
  --surface-2: #232b29;
  --surface-3: #2a3331;
  --border: #313b38;
  --border-strong: #3f4b47;

  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-color-active: rgba(127, 191, 168, 0.45);
  --overlay: rgba(10, 14, 13, 0.62);

  --text-strong: #eef2ee;
  --text-primary: #e3e9e5;
  --text-secondary: #a9b5af;
  --text-muted: #869089;
  --text-inverse: #16201c;

  --primary: #7fbfa8;
  --primary-hover: #94ccb7;
  --primary-light: rgba(127, 191, 168, 0.14);
  --primary-glow: rgba(127, 191, 168, 0.22);
  --primary-soft: rgba(127, 191, 168, 0.10);
  --primary-contrast: #12201c;

  --secondary: #8fb0cd;
  --secondary-hover: #a4c0d9;
  --secondary-light: rgba(143, 176, 205, 0.14);
  --secondary-soft: rgba(143, 176, 205, 0.10);

  --accent-gold: #d9ac6b;
  --accent-gold-light: rgba(217, 172, 107, 0.14);
  --accent-warm-soft: rgba(217, 172, 107, 0.10);

  --success: #7cbd99;
  --success-light: rgba(124, 189, 153, 0.14);
  --error: #d99089;
  --error-light: rgba(217, 144, 137, 0.14);
  --warning: #d9ac6b;
  --warning-light: rgba(217, 172, 107, 0.14);
  --info: #8fb0cd;
  --info-light: rgba(143, 176, 205, 0.14);

  --level-a1: #7cbd99;
  --level-a2: #74bdbd;
  --level-b1: #8fb0cd;
  --level-b2: #a8a8d1;
  --level-c1: #c69cc0;
  --level-c2: #d9ac6b;

  --grad-primary: linear-gradient(135deg, #4f8f78 0%, #45806f 55%, #3f7480 100%);
  --grad-card: linear-gradient(160deg, #212927 0%, #1c2321 100%);
  --grad-calm: radial-gradient(circle at 20% -10%, rgba(127, 191, 168, 0.08), transparent 55%),
               radial-gradient(circle at 85% 0%, rgba(217, 172, 107, 0.06), transparent 50%);

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.24);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.28);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.32);
  --shadow-lg: 0 14px 34px rgba(0, 0, 0, 0.38);
  --shadow-glow: 0 6px 20px rgba(127, 191, 168, 0.16);
}

/* ==============================================================================
   Reset & Base
   ============================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--canvas);
  color: var(--text-primary);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  letter-spacing: 0.002em;
}

/* Luz ambiente sutil no topo da página (dissolve sem emenda visível) */
body::before {
  content: '';
  position: fixed;
  inset: 0 0 auto 0;
  height: min(75vh, 720px);
  background: var(--grad-calm);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--text-strong);
  line-height: 1.28;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h1 { font-size: clamp(1.6rem, 1.35rem + 0.9vw, 2rem); }
h2 { font-size: clamp(1.3rem, 1.18rem + 0.45vw, 1.5rem); }
h3 { font-size: 1.15rem; }
h4 { font-size: 1.02rem; font-family: var(--font-sans); font-weight: 700; }

p {
  color: var(--text-secondary);
  text-wrap: pretty;
}

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

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

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

button, input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
  color: inherit;
}

::selection {
  background: var(--primary-light);
  color: var(--text-strong);
}

/* Barra de rolagem discreta */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-full);
  border: 3px solid transparent;
  background-clip: content-box;
}

/* ==============================================================================
   Acessibilidade
   ============================================================================== */

.skip-link {
  position: absolute;
  top: -120px;
  left: 1rem;
  background: var(--primary);
  color: var(--primary-contrast);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  z-index: 99999;
  box-shadow: var(--shadow-lg);
  transition: top var(--transition-fast);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 1rem;
  color: var(--primary-contrast);
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.sr-only-focusable:focus,
.sr-only-focusable:focus-visible {
  position: static !important;
  width: auto !important;
  height: auto !important;
  margin: 0 !important;
  overflow: visible !important;
  clip: auto !important;
  white-space: normal !important;
}

:focus-visible {
  outline: 2px solid var(--primary) !important;
  outline-offset: 2px !important;
  box-shadow: var(--shadow-focus) !important;
}

@media (forced-colors: active) {
  :focus-visible { outline: 3px solid Highlight !important; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==============================================================================
   Layout: navegação no topo + conteúdo centralizado
   ============================================================================== */

#app-layout {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

#main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

#app-content {
  flex: 1;
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-6) var(--space-5) var(--space-8);
}

/* ==============================================================================
   Padrão de cabeçalho de página (idêntico em todas as telas)
   ============================================================================== */

.page-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

.page-head-main { min-width: 0; }

.page-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 0.45rem;
}

.page-title {
  margin: 0 0 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.page-sub {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: var(--prose-max);
}

.page-head-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* ==============================================================================
   Utilitários de layout
   ============================================================================== */

.section { margin-bottom: var(--space-6); }
.stack { display: flex; flex-direction: column; gap: var(--space-4); }
.row { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); flex-wrap: wrap; }

.grid { display: grid; gap: var(--space-4); }
.grid-2 { display: grid; gap: var(--space-4); grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-3 { display: grid; gap: var(--space-4); grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid-2col { display: grid; gap: var(--space-5); grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

.prose { max-width: var(--prose-max); }
.muted { color: var(--text-muted); }
.soft { color: var(--text-secondary); }
.center { text-align: center; }
.fr-text { font-family: var(--font-serif); }

.divider {
  height: 1px;
  background: var(--border);
  border: 0;
  margin: var(--space-5) 0;
}

.soft-panel {
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

/* ==============================================================================
   Animações (curtas, discretas)
   ============================================================================== */

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

@keyframes softPulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--primary-glow); }
  50% { box-shadow: 0 0 0 8px rgba(63, 122, 104, 0.06); }
}

@keyframes flameWiggle {
  0%, 100% { transform: rotate(0deg) scale(1); }
  25% { transform: rotate(-6deg) scale(1.05); }
  75% { transform: rotate(6deg) scale(1.05); }
}

@keyframes breathe {
  0%, 100% { opacity: 0.65; }
  50% { opacity: 1; }
}

@keyframes spin { to { transform: rotate(360deg); } }

.animate-fade-in { animation: fadeIn var(--transition-smooth) both; }
.pulse-primary { animation: softPulse 3.2s ease-in-out infinite; }
.breathe { animation: breathe 3s ease-in-out infinite; }

.streak-flame {
  display: inline-block;
  animation: flameWiggle 3s ease-in-out infinite;
}

.spinner {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  border-top-color: var(--primary);
  animation: spin 0.9s linear infinite;
  display: inline-block;
}