/* Header / nav */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-alt);
}

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.site-logo {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--color-text);
  white-space: nowrap;
}

.site-logo span { color: var(--color-accent); }

.site-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
  font-size: 0.9rem;
  margin-left: auto;
}

.site-nav-links a {
  color: var(--color-text-muted);
}

.site-nav-links a.active,
.site-nav-links a:hover {
  color: var(--color-accent);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  padding: 1.25rem;
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}

.card-link {
  display: block;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card-link:hover {
  text-decoration: none;
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.card-title {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-text);
  margin-bottom: 0.3rem;
}

.card-desc {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  margin: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.55rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  color: var(--color-text);
  cursor: pointer;
  text-decoration: none;
}

.btn:hover { border-color: var(--color-accent); text-decoration: none; }

.btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #04121c;
}

.btn-primary:hover { filter: brightness(1.08); }

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-row {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin: 1rem 0;
}

/* Question rendering */
.question {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  margin-bottom: 1.25rem;
}

.question-meta {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
}

.question-enunciado {
  font-weight: 600;
  margin-bottom: 0.9rem;
}

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

.opcion {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.65rem 0.85rem;
  margin-bottom: 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface-alt);
  color: var(--color-text);
  cursor: pointer;
  font: inherit;
}

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

.opcion.selected { border-color: var(--color-accent); background: color-mix(in srgb, var(--color-accent) 15%, var(--color-surface-alt)); }
.opcion.correct { border-color: var(--color-ok); background: color-mix(in srgb, var(--color-ok) 18%, var(--color-surface-alt)); }
.opcion.incorrect { border-color: var(--color-bad); background: color-mix(in srgb, var(--color-bad) 18%, var(--color-surface-alt)); }
.opcion:disabled { cursor: default; }

.feedback {
  margin-top: 0.9rem;
  padding: 0.75rem 0.9rem;
  border-radius: 8px;
  font-size: 0.9rem;
  border: 1px solid var(--color-border);
}

.feedback.ok { border-color: var(--color-ok); color: var(--color-ok); }
.feedback.bad { border-color: var(--color-bad); color: var(--color-bad); }

.respuesta-modelo {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  margin-top: 0.9rem;
  font-size: 0.92rem;
}

textarea.respuesta-desarrollo {
  width: 100%;
  min-height: 90px;
  font: inherit;
  padding: 0.65rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  color: var(--color-text);
  resize: vertical;
}

/* Progress bars */
.progress-bar-track {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  height: 10px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--color-accent);
  border-radius: 999px;
}

/* Quiz setup / results */
.quiz-setup label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.3rem;
}

.quiz-setup select, .quiz-setup input {
  font: inherit;
  padding: 0.5rem 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  color: var(--color-text);
  width: 100%;
}

.result-summary {
  text-align: center;
  padding: 2rem 1rem;
}

.result-score {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent);
}

.result-detail-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.88rem;
}

.dot { width: 10px; height: 10px; border-radius: 999px; flex-shrink: 0; }
.dot.ok { background: var(--color-ok); }
.dot.bad { background: var(--color-bad); }

.timer {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
}

.timer.low { color: var(--color-bad); border-color: var(--color-bad); }