/* =============================================
   AJUDA — TEMA CLARO
   ============================================= */
:root {
  --bg-base:         #f0f4fb;
  --bg-surface:      #ffffff;
  --bg-subtle:       #f8fafc;
  --border:          #e2e8f0;
  --header-bg:       rgba(26, 86, 219, 1);
  --text-primary:    #0f172a;
  --text-secondary:  #475569;
  --text-muted:      #94a3b8;
  --accent:          #1a56db;
  --accent-light:    #3b72f0;
  --accent-glow:     rgba(26, 86, 219, 0.14);
  --card-title:      #1a56db;
  --back-text:       #1a56db;
  --back-bg:         rgba(255,255,255,0.95);
  --theme-btn-color: rgba(255,255,255,0.85);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg-base);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--text-secondary);
  -webkit-font-smoothing: antialiased;
}

/* --- Header --- */
header {
  background: var(--header-bg);
  padding: 16px 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 16px rgba(26,86,219,0.25);
}

header h1 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.01em;
  flex: 1;
  text-align: center;
}

/* botão voltar */
.voltar {
  position: fixed;
  top: 11px;
  left: 16px;
  background: var(--back-bg);
  color: var(--back-text);
  border: 1px solid rgba(255,255,255,0.3);
  padding: 7px 13px;
  border-radius: 9px;
  text-decoration: none;
  font-size: 12.5px;
  font-weight: 600;
  font-family: inherit;
  backdrop-filter: blur(8px);
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: background 0.18s ease, transform 0.15s ease, box-shadow 0.18s ease;
}
.voltar:hover {
  background: #fff;
  transform: translateX(-2px);
  box-shadow: 0 3px 12px rgba(26,86,219,0.15);
}

/* botão tema — fixo no canto superior direito */
.theme-toggle-button {
  position: fixed;
  top: 12px;
  right: 16px;
  width: 40px;
  height: 40px;
  border: 1.5px solid var(--accent);
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  line-height: 1;
  z-index: 300;
  box-shadow: 0 4px 14px var(--accent-glow);
  transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.18s ease;
}
.theme-toggle-button:hover {
  background: var(--accent-light);
  box-shadow: 0 6px 20px var(--accent-glow);
  transform: scale(1.06);
}

/* --- Conteúdo --- */
.container {
  padding: 32px 24px 56px;
  max-width: 1080px;
  margin: 0 auto;
}

.intro {
  text-align: center;
  margin-bottom: 36px;
  animation: fadeUp 0.45s ease both;
}

.intro h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  margin-bottom: 8px;
}

.intro p {
  font-size: 14.5px;
  color: var(--text-secondary);
}

/* --- Cards --- */
.steps, .extra {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  flex: 1 1 250px;
  max-width: 310px;
  color: var(--text-secondary);
  animation: fadeUp 0.45s ease both;
  transition: border-color 0.22s ease, transform 0.22s ease, box-shadow 0.22s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 20px; right: 20px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  border-color: rgba(26,86,219,0.30);
  transform: translateY(-3px);
  box-shadow: 0 8px 28px var(--accent-glow);
}

.card:hover::before { opacity: 1; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.steps .card:nth-child(1) { animation-delay: 0.05s; }
.steps .card:nth-child(2) { animation-delay: 0.10s; }
.steps .card:nth-child(3) { animation-delay: 0.15s; }
.steps .card:nth-child(4) { animation-delay: 0.20s; }
.steps .card:nth-child(5) { animation-delay: 0.25s; }
.extra .card:nth-child(1) { animation-delay: 0.30s; }
.extra .card:nth-child(2) { animation-delay: 0.35s; }

.card h3 {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--card-title);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.card img {
  width: 100%;
  border-radius: 9px;
  margin: 8px 0;
  display: block;
  border: 1px solid var(--border);
}

.card p { font-size: 13px; line-height: 1.65; }
.card p + p { margin-top: 8px; }
.card strong { color: var(--text-primary); }

/* --- Agradecimento --- */
.thank-you {
  text-align: center;
  margin-top: 44px;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  animation: fadeUp 0.45s 0.40s ease both;
}

/* --- Footer --- */
footer {
  background: var(--header-bg);
  color: rgba(255,255,255,0.65);
  text-align: center;
  padding: 16px 24px;
  margin-top: 48px;
  font-size: 12.5px;
}

@media (max-width: 768px) {
  header h1 { font-size: 13px; }
  .card { max-width: 100%; }
  .intro h2 { font-size: 20px; }
}

@media (max-width: 480px) {
  header { padding: 14px 50px 14px 68px; }
  .container { padding: 24px 16px 44px; }
  .voltar { top: 9px; left: 12px; }
}