/* ══════════════════════════════════════════
   tema-shared.css — Estilos compartidos para
   todas las páginas de tema individual
   EduNovaOne
   ══════════════════════════════════════════ */

/* ── Layout ── */
.book-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.75rem;
  align-items: start;
}

/* ── Sidebar ── */
.book-sidebar {
  position: sticky;
  top: 1.5rem;
  background: #fff;
  border: 1px solid rgba(59,130,246,0.1);
  border-radius: 1.75rem;
  padding: 1.5rem;
  box-shadow: 0 16px 40px rgba(15,23,42,0.06);
}
.book-sidebar-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(59,130,246,0.08);
}
.book-cover-mini {
  width: 3rem; height: 3rem;
  border-radius: 0.85rem;
  background: linear-gradient(135deg,#7c3aed,#2563eb);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; flex-shrink: 0;
}
.book-sidebar-header h3 { margin: 0; font-size: 0.92rem; color: var(--accent-strong); font-weight: 700; line-height: 1.3; }
.book-sidebar-header p  { margin: 0.15rem 0 0; font-size: 0.78rem; color: var(--text-muted); }

.toc-label { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 0.6rem; }
.toc-list  { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.15rem; }
.toc-list li a {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.55rem 0.75rem;
  border-radius: 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  transition: background 0.18s, color 0.18s;
}
.toc-list li a:hover { background: rgba(99,102,241,0.07); color: var(--accent-strong); }
.toc-list li a.active { background: rgba(99,102,241,0.12); color: var(--accent-strong); font-weight: 700; }
.toc-list li a .toc-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 1.5rem; height: 1.5rem; border-radius: 50%;
  background: rgba(99,102,241,0.1);
  font-size: 0.72rem; font-weight: 700; color: var(--accent);
  flex-shrink: 0;
}
.toc-section-title {
  font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.07em; color: var(--accent-strong);
  padding: 0.75rem 0.75rem 0.2rem; margin: 0;
}

.progress-block {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(59,130,246,0.08);
}
.progress-label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 0.4rem; display: flex; justify-content: space-between; }
.progress-bar { height: 6px; background: rgba(99,102,241,0.1); border-radius: 99px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg,#7c3aed,#2563eb); border-radius: 99px; width: 0%; transition: width 0.4s; }

/* ── PDF download button ── */
.pdf-download-btn {
  display: flex; align-items: center; justify-content: center; gap: 0.5rem;
  margin-top: 1rem;
  padding: 0.65rem 1rem;
  border-radius: 0.85rem;
  background: linear-gradient(135deg, #dc2626, #ef4444);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  width: 100%;
  transition: opacity 0.2s, transform 0.15s;
  text-decoration: none;
}
.pdf-download-btn:hover { opacity: 0.9; transform: translateY(-1px); }
.pdf-download-btn .pdf-icon { font-size: 1rem; }

/* ── Main content ── */
.book-main { display: grid; gap: 1.75rem; }

/* Breadcrumb */
.breadcrumb-bar {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.88rem; color: var(--text-muted);
  flex-wrap: wrap;
}
.breadcrumb-bar a { color: var(--accent-strong); text-decoration: none; font-weight: 600; }
.breadcrumb-bar a:hover { text-decoration: underline; }
.breadcrumb-bar span { color: var(--text-muted); }

/* Chapter card */
.chapter-card {
  background: #fff;
  border: 1px solid rgba(59,130,246,0.08);
  border-radius: 1.75rem;
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(15,23,42,0.05);
  scroll-margin-top: 1.5rem;
}
.chapter-header {
  display: flex; align-items: center; gap: 1rem;
  padding: 1.5rem;
  border-bottom: 1px solid rgba(59,130,246,0.07);
  cursor: pointer;
  user-select: none;
}
.chapter-header:hover { background: rgba(99,102,241,0.02); }
.chapter-num {
  width: 2.8rem; height: 2.8rem; border-radius: 0.9rem; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; font-weight: 900; color: #fff;
}
.num-basic    { background: linear-gradient(135deg,#7c3aed,#6366f1); }
.num-inter    { background: linear-gradient(135deg,#2563eb,#0ea5e9); }
.num-advanced { background: linear-gradient(135deg,#059669,#10b981); }

.chapter-header-text { flex: 1; }
.chapter-header-text .chapter-level {
  font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--accent); margin-bottom: 0.15rem; margin-top: 0;
}
.chapter-header-text h2 { margin: 0; font-size: 1.05rem; color: var(--text); }
.chapter-header-text p  { margin: 0.2rem 0 0; font-size: 0.85rem; color: var(--text-muted); }
.chapter-toggle { font-size: 1.1rem; color: var(--text-muted); transition: transform 0.25s; }
.chapter-card.open .chapter-toggle { transform: rotate(180deg); }

.chapter-body { display: none; padding: 0 1.5rem 1.5rem; }
.chapter-card.open .chapter-body { display: block; }

/* Topics inside chapter */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px,1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.topic-book {
  border: 1.5px solid rgba(99,102,241,0.12);
  border-radius: 1.25rem;
  overflow: hidden;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
  cursor: pointer;
  background: #fff;
}
.topic-book:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(99,102,241,0.14);
  border-color: var(--accent);
}
.topic-book-cover {
  height: 110px;
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}
.cover-basic   { background: linear-gradient(135deg,rgba(124,58,237,0.1),rgba(167,139,250,0.08)); }
.cover-inter   { background: linear-gradient(135deg,rgba(37,99,235,0.1),rgba(96,165,250,0.08)); }
.cover-advanced{ background: linear-gradient(135deg,rgba(5,150,105,0.1),rgba(52,211,153,0.08)); }
.cover-science { background: linear-gradient(135deg,rgba(16,185,129,0.1),rgba(52,211,153,0.08)); }
.cover-history { background: linear-gradient(135deg,rgba(217,119,6,0.1),rgba(251,191,36,0.08)); }
.cover-comm    { background: linear-gradient(135deg,rgba(239,68,68,0.1),rgba(252,165,165,0.08)); }
.cover-english { background: linear-gradient(135deg,rgba(37,99,235,0.1),rgba(147,197,253,0.08)); }
.cover-tech    { background: linear-gradient(135deg,rgba(2,132,199,0.1),rgba(125,211,252,0.08)); }
.cover-art     { background: linear-gradient(135deg,rgba(192,38,211,0.1),rgba(233,168,245,0.08)); }

.topic-book-info { padding: 0.9rem 1rem; }
.topic-book-info h4 { margin: 0 0 0.3rem; font-size: 0.92rem; color: var(--text); font-weight: 700; }
.topic-book-info p  { margin: 0 0 0.6rem; font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; }
.topic-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.topic-tag {
  padding: 0.2rem 0.6rem; border-radius: 99px;
  font-size: 0.72rem; font-weight: 700;
  background: rgba(99,102,241,0.08); color: var(--accent-strong);
}

/* Topic detail / expanded panel */
.topic-detail {
  display: none;
  grid-column: 1 / -1;
  background: #f8fbff;
  border: 1.5px solid rgba(99,102,241,0.15);
  border-radius: 1.25rem;
  padding: 1.5rem;
  margin-top: 0.25rem;
}
.topic-detail.open { display: block; }
.topic-detail h3 { margin: 0 0 0.75rem; font-size: 1.05rem; color: var(--accent-strong); }
.topic-detail p  { margin: 0 0 0.75rem; color: var(--text-muted); font-size: 0.92rem; line-height: 1.7; }

.detail-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin: 0.75rem 0; }
.detail-box {
  background: #fff;
  border: 1px solid rgba(59,130,246,0.1);
  border-radius: 1rem;
  padding: 1.1rem;
}
.detail-box h4 { margin: 0 0 0.6rem; font-size: 0.9rem; color: var(--text); font-weight: 700; }
.detail-box ul  { margin: 0; padding-left: 1.1rem; color: var(--text-muted); font-size: 0.88rem; line-height: 1.8; }

.formula-display {
  margin: 0.75rem 0;
  padding: 0.85rem 1.25rem;
  background: rgba(99,102,241,0.06);
  border: 1.5px solid rgba(99,102,241,0.18);
  border-radius: 0.85rem;
  font-size: 1.05rem; font-style: italic;
  font-weight: 700; color: var(--accent-strong);
  text-align: center;
}
.example-block {
  background: #fff;
  border-left: 3px solid var(--accent);
  border-radius: 0 0.75rem 0.75rem 0;
  padding: 0.85rem 1rem;
  margin-top: 0.75rem;
}
.example-block strong { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--accent); }
.example-block p { margin: 0.35rem 0 0; font-size: 0.92rem; color: var(--text); }

/* Exercises section */
.exercises-section {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1.5px dashed rgba(99,102,241,0.15);
}
.exercises-section h4 {
  font-size: 0.95rem; font-weight: 800; color: var(--accent-strong);
  margin: 0 0 0.85rem;
  display: flex; align-items: center; gap: 0.5rem;
}
.exercise-list { display: grid; gap: 0.75rem; list-style: none; padding: 0; margin: 0 0 1rem; }
.exercise-item {
  background: #fff;
  border: 1px solid rgba(59,130,246,0.1);
  border-radius: 0.9rem;
  padding: 1rem 1.1rem;
  font-size: 0.9rem; color: var(--text);
  line-height: 1.6;
}
.exercise-item strong { display: block; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--accent); margin-bottom: 0.3rem; }

.answer-toggle-btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  margin-top: 0.5rem;
  padding: 0.35rem 0.85rem; border-radius: 99px;
  background: rgba(99,102,241,0.08); color: var(--accent-strong);
  font-size: 0.8rem; font-weight: 700; cursor: pointer; border: none;
  transition: background 0.18s;
}
.answer-toggle-btn:hover { background: rgba(99,102,241,0.15); }
.answer-box {
  display: none;
  margin-top: 0.6rem;
  padding: 0.75rem 1rem;
  background: rgba(16,185,129,0.06);
  border: 1px solid rgba(16,185,129,0.18);
  border-radius: 0.75rem;
  font-size: 0.88rem; color: #065f46;
}
.answer-box.open { display: block; }

.img-placeholder {
  width: 100%; height: 120px;
  border-radius: 0.85rem;
  background: linear-gradient(135deg,rgba(124,58,237,0.08),rgba(37,99,235,0.06));
  border: 1.5px dashed rgba(99,102,241,0.2);
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 0.4rem;
  color: var(--text-muted); font-size: 0.85rem;
  margin-top: 0.75rem;
}
.img-placeholder span { font-size: 2rem; }

.close-detail {
  display: inline-flex; align-items: center; gap: 0.4rem;
  margin-top: 1rem;
  padding: 0.5rem 1.1rem; border-radius: 99px;
  background: rgba(99,102,241,0.08); color: var(--accent-strong);
  font-size: 0.85rem; font-weight: 700; cursor: pointer; border: none;
  transition: background 0.18s;
}
.close-detail:hover { background: rgba(99,102,241,0.15); }

/* Section banner */
.section-banner {
  display: flex; align-items: center; gap: 1rem;
  padding: 1.1rem 1.5rem;
  border-radius: 1.25rem;
  margin-bottom: 1rem;
}
.banner-basic    { background: linear-gradient(135deg,rgba(124,58,237,0.08),rgba(167,139,250,0.05)); border: 1px solid rgba(124,58,237,0.12); }
.banner-inter    { background: linear-gradient(135deg,rgba(37,99,235,0.08),rgba(96,165,250,0.05));  border: 1px solid rgba(37,99,235,0.12); }
.banner-advanced { background: linear-gradient(135deg,rgba(5,150,105,0.08),rgba(52,211,153,0.05)); border: 1px solid rgba(5,150,105,0.12); }
.section-banner .banner-icon { font-size: 2rem; flex-shrink: 0; }
.section-banner h3 { margin: 0 0 0.15rem; font-size: 1rem; color: var(--text); font-weight: 700; }
.section-banner p  { margin: 0; font-size: 0.83rem; color: var(--text-muted); }

/* PDF print styles */
@media print {
  .book-sidebar, nav, footer, .close-detail, .answer-toggle-btn, .pdf-download-btn { display: none !important; }
  .book-layout { grid-template-columns: 1fr; }
  .chapter-body { display: block !important; }
  .topic-detail { display: block !important; }
  .chapter-card { box-shadow: none; border: 1px solid #ddd; break-inside: avoid; }
}

/* Responsive */
@media (max-width: 900px) {
  .book-layout { grid-template-columns: 1fr; }
  .book-sidebar { position: static; }
  .detail-columns { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .topics-grid { grid-template-columns: 1fr; }
}