/* === Book Club Styles === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  line-height: 1.7;
  color: #1a1a2e;
  background: #f8f9fa;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.container { max-width: 720px; margin: 0 auto; padding: 0 1.5rem; }

/* Nav */
.nav {
  background: #1a1a2e;
  color: #fff;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.nav-inner { display: flex; align-items: center; gap: 1rem; }
.nav-brand { color: #fff; text-decoration: none; font-weight: 700; font-size: 1.2rem; }
.nav-brand:hover { color: #a8d8ea; }
.nav-link { color: #ccc; text-decoration: none; font-size: 0.85rem; padding: 0.3rem 0.6rem; border-radius: 4px; }
.nav-link:hover { background: rgba(255,255,255,0.1); color: #fff; }

/* Footer */
.footer { margin-top: auto; background: #1a1a2e; color: #666; padding: 1.5rem 0; text-align: center; font-size: 0.85rem; }
.bmc-link { color: #f1c40f; text-decoration: none; font-weight: 600; }
.bmc-link:hover { text-decoration: underline; }
main { flex: 1; padding: 2rem 0; }

/* === Index Page === */

/* Current Book Hero */
.current-book {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: #fff;
  padding: 2.5rem 2rem;
  border-radius: 12px;
  margin: 2rem;
  position: relative;
}
.current-book-inner {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}
.book-cover-index {
  width: 110px;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
  flex-shrink: 0;
}
.current-book-text { flex: 1; }
.current-ribbon {
  display: inline-block;
  background: #e74c3c;
  color: #fff;
  padding: 0.2rem 0.8rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}
.current-book h2 { font-size: 1.8rem; font-weight: 800; margin-bottom: 0.25rem; line-height: 1.2; }
.current-book .book-author { color: #a8d8ea; font-size: 1rem; margin-bottom: 1rem; }
.current-book .book-intro { color: #ccc; font-size: 0.95rem; line-height: 1.6; margin-bottom: 1.5rem; }
@media (max-width: 480px) {
  .current-book-inner { flex-direction: column; align-items: center; text-align: center; }
}
.btn {
  display: inline-block;
  background: #4a6fa5;
  color: #fff;
  padding: 0.65rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: background 0.2s;
}
.btn:hover { background: #5d82b8; }

/* Upcoming Book */
.upcoming-book { margin-bottom: 2rem; }
.upcoming-book h3 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #888;
  margin-bottom: 0.75rem;
}
.upcoming-card {
  background: #fff;
  border: 1px dashed #ccc;
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
}
.upcoming-card h4 { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.15rem; }
.upcoming-card .book-author { color: #666; font-size: 0.9rem; }

/* Past Books */
.past-books { margin-bottom: 2rem; }
.past-books h3 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #888;
  margin-bottom: 0.75rem;
}
.past-books ul { list-style: none; }
.past-books li {
  padding: 0.5rem 0;
  border-bottom: 1px solid #eee;
}
.past-books a { color: #4a6fa5; text-decoration: none; font-weight: 500; }
.past-books a:hover { text-decoration: underline; }
.past-author { color: #888; font-size: 0.9rem; }

/* === Book Detail Page === */
.book-header { margin: 2rem; }
.book-header-inner {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}
.book-cover {
  width: 130px;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
  flex-shrink: 0;
}
.book-header-text { flex: 1; }
@media (max-width: 480px) {
  .book-header-inner { flex-direction: column; align-items: center; text-align: center; }
}
.book-header h1 { font-size: 1.75rem; font-weight: 800; line-height: 1.3; margin-bottom: 0.2rem; }
.book-header .book-author { color: #555; font-size: 1.05rem; margin-bottom: 0.5rem; }
.book-details { display: flex; gap: 1.5rem; font-size: 0.85rem; color: #666; margin-bottom: 0.75rem; flex-wrap: wrap; }
.book-desc { color: #444; font-size: 0.95rem; line-height: 1.6; margin-bottom: 1.5rem; }

/* Week Nav */
.week-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: baseline;
  margin-bottom: 2rem;
  padding: 1rem;
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  font-size: 0.85rem;
}
.week-jump {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  background: #e8ecf1;
  border-radius: 4px;
  color: #4a6fa5;
  text-decoration: none;
  font-weight: 500;
  transition: background 0.2s;
}
.week-jump:hover { background: #d0d8e3; }

/* Weekly Sections */
.week {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 10px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}
.week-header {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.week-num {
  font-weight: 700; font-size: 0.78rem; color: #4a6fa5;
  background: #e2e8f0; padding: 0.2rem 0.6rem; border-radius: 4px;
  text-transform: uppercase; letter-spacing: 0.05em;
}
.week-header h2 { font-size: 1.05rem; font-weight: 600; flex: 1; }
.week-pages { font-size: 0.8rem; color: #888; }

/* Questions */
.icebreaker {
  background: #fff8e1;
  padding: 0.7rem 1rem;
  border-radius: 6px;
  margin-bottom: 1rem;
  font-size: 0.93rem;
  color: #5d4037;
  border-left: 3px solid #f1c40f;
  line-height: 1.5;
}

.application {
  background: #e8f5e9;
  padding: 0.7rem 1rem;
  border-radius: 6px;
  margin-top: 1rem;
  font-size: 0.93rem;
  color: #1b5e20;
  border-left: 3px solid #4caf50;
  line-height: 1.5;
}

.questions { list-style: none; }
.question {
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  background: #f0f4f8;
  border-radius: 6px;
  border-left: 3px solid #4a6fa5;
  font-size: 0.93rem;
  color: #333;
  line-height: 1.6;
}

/* Supplementary */
.supplementary { margin-top: 2rem; }
.supplementary h2 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; }
.supplementary ul { list-style: disc; padding-left: 1.5rem; font-size: 0.9rem; }
.supplementary li { margin-bottom: 0.25rem; }
.supplementary a { color: #4a6fa5; text-decoration: none; }
.supplementary a:hover { text-decoration: underline; }

/* Responsive */
@media (max-width: 640px) {
  .current-book { padding: 1.5rem; }
  .current-book h2 { font-size: 1.4rem; }
  .book-details { flex-direction: column; gap: 0.25rem; }
  .week-nav { flex-direction: column; }
}