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

:root {
  --bg:       #0d0d0d;
  --surface:  #1a1a1a;
  --border:   #2a2a2a;
  --text:     #e8e8e8;
  --muted:    #888;
  --accent:   #00d4a0;
  --radius:   8px;
  --font:     -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg:      #f5f5f5;
    --surface: #ffffff;
    --border:  #e0e0e0;
    --text:    #1a1a1a;
    --muted:   #666;
  }
}

body {
  background: var(--bg);
  color:      var(--text);
  font-family: var(--font);
  font-size:  16px;
  line-height: 1.6;
  padding:    24px 16px 64px;
}

.container {
  max-width: 760px;
  margin:    0 auto;
}

header {
  padding:       32px 0 40px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}

.header-top {
  display:       flex;
  justify-content: space-between;
  align-items:   center;
  margin-bottom: 16px;
}

.breadcrumb {
  font-size: 13px;
  color:     var(--muted);
}

.breadcrumb a {
  color:           var(--accent);
  text-decoration: none;
}

.breadcrumb a:hover { text-decoration: underline; }

.lang-btn {
  background:  transparent;
  border:      1px solid var(--border);
  color:       var(--muted);
  padding:     4px 10px;
  border-radius: var(--radius);
  font-size:   12px;
  font-family: var(--font);
  cursor:      pointer;
  transition:  border-color 0.15s, color 0.15s;
  flex-shrink: 0;
}

.lang-btn:hover {
  border-color: var(--accent);
  color:        var(--accent);
}

h1 {
  font-size:   2rem;
  font-weight: 700;
  color:       var(--accent);
  margin-bottom: 8px;
}

.subtitle {
  color:     var(--muted);
  font-size: 1rem;
}

.faq-list {
  list-style: none;
  display:    flex;
  flex-direction: column;
  gap:        12px;
}

details {
  background:    var(--surface);
  border:        1px solid var(--border);
  border-radius: var(--radius);
  overflow:      hidden;
}

details[open] { border-color: var(--accent); }

summary {
  padding:    18px 20px;
  font-weight: 600;
  font-size:  0.975rem;
  cursor:     pointer;
  list-style: none;
  display:    flex;
  justify-content: space-between;
  align-items: center;
  gap:        12px;
  user-select: none;
}

summary::-webkit-details-marker { display: none; }

summary::after {
  content:     '+';
  font-size:   1.25rem;
  font-weight: 300;
  color:       var(--accent);
  flex-shrink: 0;
  line-height: 1;
}

details[open] summary::after { content: '−'; }

summary:hover { background: color-mix(in srgb, var(--accent) 6%, transparent); }

.answer {
  padding:     0 20px 20px;
  color:       var(--muted);
  font-size:   0.925rem;
  line-height: 1.7;
}

.answer ol,
.answer ul {
  padding-left: 20px;
  margin-top:   8px;
}

.answer ol li,
.answer ul li { margin-bottom: 4px; }

footer {
  margin-top:    64px;
  padding-top:   24px;
  border-top:    1px solid var(--border);
  font-size:     13px;
  color:         var(--muted);
  display:       flex;
  gap:           16px;
  flex-wrap:     wrap;
  align-items:   center;
}

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

footer a:hover { text-decoration: underline; }

/* Language switching */
[data-lang="en"] .t-es { display: none; }
[data-lang="es"] .t-en { display: none; }

@media (max-width: 480px) {
  h1 { font-size: 1.5rem; }
  summary { padding: 14px 16px; }
  .answer { padding: 0 16px 16px; }
}