/* ============================================================
   ALEX REYES · /aula/ — módulo de exámenes IB AI HL
   Hereda paleta de /style.css (--text, --bg, --border, etc.)
   ============================================================ */

/* ---- EXAM HEADER ---- */
.exam-header {
  padding: 2rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}
.exam-header .section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}
.exam-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.2rem;
  font-size: 0.85rem;
  color: var(--text-soft);
  margin-top: 0.5rem;
}
.exam-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.exam-meta strong {
  color: var(--text);
  font-weight: 600;
}

/* ---- EXAM NAV (prev / index / next) ---- */
.exam-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.8rem;
  align-items: center;
  padding: 1rem 0;
  margin: 1.5rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
}
.exam-nav a, .exam-nav span.disabled {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  background: var(--bg-subtle);
  transition: all 0.15s;
  white-space: nowrap;
}
.exam-nav a:hover {
  border-color: var(--border-strong);
  color: var(--text);
  opacity: 1;
}
.exam-nav .prev { justify-self: start; }
.exam-nav .next { justify-self: end; }
.exam-nav .index { justify-self: center; font-weight: 500; }
.exam-nav span.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ---- QUESTION BLOCK ---- */
.question-block {
  margin-bottom: 2.5rem;
}
.question-block h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}
.question-descriptor {
  font-size: 1rem;
  color: var(--text-soft);
  margin-bottom: 1.2rem;
  font-style: italic;
}
.score-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.8rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text);
  font-family: var(--mono);
  margin-bottom: 1rem;
}
.score-pill::before {
  content: "";
  width: 8px;
  height: 8px;
  background: #d97706;
  border-radius: 50%;
}

/* ---- STATEMENT ---- */
.statement {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text);
  margin-bottom: 1.5rem;
}
.statement p { margin-bottom: 0.8rem; }
.statement .context {
  padding: 1.2rem 1.4rem;
  background: var(--bg-subtle);
  border-left: 3px solid var(--text);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 1.5rem;
}
.statement ol.apartados {
  list-style: none;
  counter-reset: apartado;
  padding-left: 0;
  margin-top: 1rem;
}
.statement ol.apartados > li {
  counter-increment: apartado;
  padding: 0.8rem 0 0.8rem 2.5rem;
  position: relative;
  border-bottom: 1px solid var(--border);
}
.statement ol.apartados > li:last-child { border-bottom: none; }
.statement ol.apartados > li::before {
  content: counter(apartado, lower-alpha) ")";
  position: absolute;
  left: 0.5rem;
  top: 0.8rem;
  font-family: var(--mono);
  font-weight: 600;
  color: var(--text-faint);
  font-size: 0.9rem;
}
.apartado-puntos {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.1rem 0.45rem;
  background: var(--bg-hover);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-soft);
  vertical-align: middle;
}

/* ---- IB CURRICULUM CHIPS ---- */
.ib-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 1.2rem 0 1.8rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border);
}
.ib-chips-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-faint);
  font-weight: 600;
  margin-right: 0.3rem;
  align-self: center;
}
.ib-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.6rem;
  background: rgba(99, 102, 241, 0.08);
  color: #4f46e5;
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  cursor: help;
  transition: all 0.15s;
  position: relative;
}
[data-theme="dark"] .ib-chip {
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border-color: rgba(99, 102, 241, 0.35);
}
.ib-chip:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.4);
}
.ib-chip[data-descriptor]:hover::after {
  content: attr(data-descriptor);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  padding: 0.5rem 0.75rem;
  background: var(--text);
  color: var(--bg);
  font-family: var(--font);
  font-weight: 400;
  font-size: 0.78rem;
  border-radius: var(--radius-sm);
  white-space: normal;
  width: max-content;
  max-width: 260px;
  line-height: 1.4;
  z-index: 20;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* ---- SHOW / HIDE SOLUTION ---- */
.solution-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.3rem;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.15s;
  margin: 1rem 0;
}
.solution-toggle:hover { opacity: 0.85; }
.solution-toggle svg { transition: transform 0.2s; }
.solution-toggle.open svg { transform: rotate(180deg); }

.solution {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-left: 3px solid #059669;
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.8rem 2rem;
  margin-top: 1rem;
}
.solution[hidden] { display: none; }
.solution h3 {
  font-size: 1.05rem;
  margin: 0 0 1rem;
  color: #059669;
  font-weight: 600;
}
[data-theme="dark"] .solution h3 { color: #34d399; }
.solution .apartado-sol {
  margin-bottom: 1.8rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}
.solution .apartado-sol:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}
.solution .apartado-sol h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.solution .apartado-sol h4 .letra {
  font-family: var(--mono);
  background: var(--bg);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-soft);
}
.solution p { margin-bottom: 0.6rem; line-height: 1.7; }
.solution .math-block {
  margin: 1rem 0;
  padding: 0.9rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}
.solution .note {
  font-size: 0.85rem;
  color: var(--text-faint);
  font-style: italic;
  margin-top: 0.5rem;
}
.solution table {
  border-collapse: collapse;
  margin: 1rem 0;
  font-family: var(--mono);
  font-size: 0.82rem;
  width: 100%;
  max-width: 540px;
}
.solution table th, .solution table td {
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--border);
  text-align: right;
}
.solution table th {
  background: var(--bg-hover);
  font-weight: 600;
  color: var(--text);
  text-align: center;
}
.solution table td:first-child {
  text-align: center;
  color: var(--text-faint);
}
.solution .final {
  background: rgba(5,150,105,0.08);
  border-left: 2px solid #059669;
  padding: 0.7rem 1rem;
  margin: 0.8rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-weight: 500;
}

/* ---- EXAM INDEX CARDS ---- */
.exam-scale {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.8rem;
  margin-bottom: 2.5rem;
}
.exam-scale h2 {
  font-size: 1rem;
  margin-bottom: 1rem;
  font-weight: 600;
}
.scale-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.85rem;
}
.scale-table th, .scale-table td {
  padding: 0.55rem 0.8rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.scale-table th {
  font-weight: 600;
  color: var(--text-faint);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.scale-table tr:last-child td { border-bottom: none; }

.question-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
  margin-top: 1.5rem;
}
.question-card {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 1.2rem;
  align-items: center;
  padding: 1.3rem 1.5rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: all 0.15s;
}
.question-card:hover {
  border-color: var(--border-strong);
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  opacity: 1;
  transform: translateY(-1px);
}
.question-card-num {
  font-family: var(--mono);
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--text-faint);
  line-height: 1;
  text-align: center;
}
.question-card-body h3 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
  font-weight: 600;
}
.question-card-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 0.5rem;
}
.question-card-score {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-soft);
  text-align: right;
}
.question-card-score strong {
  display: block;
  font-size: 1.4rem;
  color: var(--text);
  font-weight: 600;
}

/* ---- DOWNLOAD PDF ---- */
.pdf-download {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 500;
  margin-top: 1rem;
}
.pdf-download:hover {
  border-color: var(--border-strong);
  background: var(--bg-hover);
  opacity: 1;
}

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  .exam-nav { grid-template-columns: 1fr; gap: 0.5rem; }
  .exam-nav .prev, .exam-nav .next, .exam-nav .index {
    justify-self: stretch;
    justify-content: center;
  }
  .question-card {
    grid-template-columns: 44px 1fr;
    gap: 0.8rem;
    padding: 1.1rem 1.2rem;
  }
  .question-card-num { font-size: 1.4rem; }
  .question-card-score {
    grid-column: 1 / -1;
    text-align: left;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
  }
  .question-card-score strong {
    display: inline;
    font-size: 1.1rem;
  }
  .solution { padding: 1.2rem 1.3rem; }
  .statement ol.apartados > li { padding-left: 2rem; }
}

/* ---- PRINT ---- */
@media print {
  nav, footer, .exam-nav, .solution-toggle, .pdf-download { display: none !important; }
  body { background: white; color: black; font-size: 11pt; }
  .solution {
    display: block !important;
    background: transparent;
    border: 1px solid #000;
    page-break-inside: avoid;
  }
  .solution[hidden] { display: block !important; }
  .solution h3 { color: #000; }
  .question-block { page-break-after: always; }
  .question-block:last-child { page-break-after: auto; }
  .ib-chip { border: 1px solid #666; color: #000; background: #f0f0f0; }
  a { color: #000; text-decoration: none; }
  .container { max-width: 100%; padding: 0; }
  main { padding: 0 !important; }
}