/*  CHAPTERWISE SECTION  */
.cw-chapter-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 22px;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.25s;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.cw-chapter-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent2), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}
.cw-chapter-card:not(.cw-locked):hover {
  border-color: rgba(0,201,106,0.35);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.3);
}
.cw-chapter-card:not(.cw-locked):hover::before { transform: scaleX(1); }

.cw-chapter-card.cw-locked {
  opacity: 0.52;
  cursor: not-allowed;
  filter: grayscale(0.3);
}
.cw-chapter-card.cw-locked:hover {
  transform: none;
  border-color: var(--border);
}

.cw-lock-icon {
  font-size: 1.1rem;
  margin-bottom: 4px;
  display: none;
}
.cw-locked .cw-lock-icon { display: block; }

.cw-chapter-num {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
}
.cw-locked .cw-chapter-num { color: var(--muted); }

.cw-chapter-name {
  font-family: 'DM Sans', sans-serif;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}

.cw-chapter-meta {
  display: flex;
  gap: 12px;
  margin-top: 10px;
}
.cw-chapter-meta span {
  font-size: 0.75rem;
  color: var(--muted);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 10px;
}

.cw-locked-label {
  display: none;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 6px;
}
.cw-locked .cw-locked-label { display: block; }

.cw-start-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  margin-top: 6px;
  letter-spacing: 0.3px;
}

/* Chapter Test Arena (overlay, same style as mock) */
#cw-arena {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--navy);
  z-index: 99999;
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  overflow-y: auto;
}
.cw-arena-header {
  position: sticky;
  top: 0;
  background: rgba(8,15,10,0.95);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  z-index: 10;
  flex-wrap: wrap;
}
.cw-arena-body {
  max-width: 780px;
  margin: 0 auto;
  padding: 40px 24px 100px;
}
.cw-q-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.cw-q-text {
  font-size: 1.12rem;
  font-weight: 500;
  line-height: 1.65;
  color: var(--text);
  margin-bottom: 28px;
}
.cw-options { display: grid; gap: 10px; margin-bottom: 28px; }
.cw-opt-btn {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.95rem;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 12px;
}
.cw-opt-btn:hover:not(:disabled) { border-color: rgba(0,201,106,0.4); background: rgba(0,201,106,0.06); }
.cw-opt-btn.selected { border-color: var(--accent); background: rgba(0,201,106,0.1); }
.cw-opt-btn.correct { border-color: #22c55e; background: rgba(34,197,94,0.12); }
.cw-opt-btn.wrong { border-color: var(--danger); background: rgba(255,77,109,0.1); }
.cw-opt-letter {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1rem;
  color: var(--muted);
  min-width: 20px;
}
.cw-submit-bar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: rgba(8,15,10,0.97);
  border-top: 1px solid var(--border);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  backdrop-filter: blur(12px);
  z-index: 10;
}
#cw-results {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--navy);
  z-index: 100000;
  overflow-y: auto;
  font-family: 'DM Sans', sans-serif;
  color: var(--text);
}