.causality-header {
  background: linear-gradient(135deg, #233445 0%, #15222e 100%);
  color: #fff;
  overflow: hidden;
  position: relative;
}
.causality-header::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(90deg, transparent 0 88px, rgba(184, 132, 46, 0.08) 89px 90px);
  pointer-events: none;
}
.causality-header .container { position: relative; z-index: 1; }
.causality-header .breadcrumb a { color: rgba(255, 255, 255, 0.78); }
.causality-header h1 { color: #fff; margin: 8px 0 6px; }
.causality-header p { color: rgba(255, 255, 255, 0.82); }
.causality-sub {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding: 6px 14px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font: 12px var(--font-mono);
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: #d3a34b; box-shadow: 0 0 8px #d3a34b; }
.causality-main { flex: 1; padding: 40px 0 64px; }
.causality-intro, .reconstruction-card, .chain-card, .verdict-card, .causality-locked {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.causality-intro {
  display: flex;
  gap: 20px;
  align-items: center;
  padding: 24px 28px;
  margin-bottom: 24px;
}
.intro-mark { font-size: 36px; color: var(--accent); }
.eyebrow, .event-type, .event-year, .chain-year { font: 12px var(--font-mono); }
.eyebrow { color: var(--accent); font-weight: 700; letter-spacing: 1px; }
.causality-intro h2 { margin: 4px 0 8px; font: 600 22px var(--font-serif); color: var(--text-main); }
.causality-intro p { margin: 0; color: var(--text-light); font-size: 14px; line-height: 1.75; }
.reconstruction-card, .chain-card, .verdict-card { padding: 24px; margin-bottom: 24px; }
.reconstruction-head { display: flex; align-items: start; justify-content: space-between; gap: 16px; padding-bottom: 16px; border-bottom: 1px solid var(--border-light); }
.card-title { color: var(--text-main); font: 600 17px var(--font-serif); }
.card-desc { margin-top: 5px; color: var(--text-light); font-size: 13px; }
.progress { flex: none; padding: 5px 10px; border-radius: 999px; background: var(--accent-bg); color: var(--accent); font: 600 12px var(--font-mono); }
.feedback { margin: 16px 0; padding: 10px 12px; border-left: 3px solid var(--accent); border-radius: 3px; background: var(--bg-alt); color: var(--text-light); font-size: 13px; line-height: 1.6; }
.feedback.success { border-color: var(--primary); color: var(--primary); }
.feedback.error { border-color: var(--danger); color: var(--danger); background: var(--danger-bg); }
.event-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.event-card { display: flex; min-height: 156px; flex-direction: column; align-items: start; padding: 16px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-alt); color: var(--text-body); cursor: pointer; font: 13px/1.65 var(--font-sans); text-align: left; transition: transform .18s, border-color .18s, box-shadow .18s; }
.event-card:hover { border-color: var(--accent); box-shadow: 0 6px 16px rgba(45, 90, 63, .12); transform: translateY(-2px); }
.event-card.incorrect { border-color: var(--danger); background: var(--danger-bg); transform: translateX(3px); }
.event-card strong { margin: 8px 0 5px; color: var(--text-main); font: 600 16px var(--font-serif); }
.event-type { color: var(--accent); font-weight: 700; }
.event-year { color: var(--danger); }
.chain-empty, .event-complete { padding: 16px 0 0; color: var(--text-muted); font-size: 13px; }
.chain-list { display: grid; gap: 10px; margin: 16px 0 0; padding: 0; list-style: none; }
.chain-list li { display: flex; gap: 12px; padding: 13px; border-left: 3px solid var(--accent); background: var(--bg-alt); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.chain-number { display: grid; place-items: center; flex: none; width: 24px; height: 24px; border-radius: 50%; background: var(--accent); color: #fff; font: 700 12px var(--font-mono); }
.chain-list strong { display: block; margin: 3px 0; color: var(--text-main); font: 600 15px var(--font-serif); }
.chain-list p { margin: 0; color: var(--text-light); font-size: 12.5px; }
.chain-card.complete { border-left: 4px solid var(--primary); }
.verdict-card { border-left: 4px solid var(--danger); text-align: center; }
.verdict-seal { display: inline-block; padding: 4px 12px; border: 1px solid var(--danger); color: var(--danger); font: 700 12px var(--font-mono); letter-spacing: 3px; }
.verdict-card h2 { margin: 14px 0 10px; color: var(--text-main); font: 600 23px var(--font-serif); }
.verdict-card p { max-width: 660px; margin: 0 auto; color: var(--text-body); font-size: 14px; line-height: 1.85; }
.verdict-line { display: flex; align-items: center; gap: 12px; max-width: 480px; margin: 22px auto; color: var(--danger); font: 600 16px var(--font-serif); }
.verdict-line i { flex: 1; height: 1px; background: linear-gradient(90deg, var(--accent), var(--danger)); }
.hidden { display: none; }
.causality-locked { padding: 80px 24px; text-align: center; }
.locked-icon { font-size: 60px; opacity: .55; }
.causality-locked h2 { color: var(--text-main); font: 600 24px var(--font-serif); }
.causality-locked p { color: var(--text-light); font-size: 14px; }
.locked-hint { margin-bottom: 24px; color: var(--text-muted) !important; }
@media (max-width: 700px) {
  .causality-main { padding: 24px 0 40px; }
  .causality-intro, .reconstruction-card, .chain-card, .verdict-card { padding: 18px; }
  .causality-intro { align-items: start; gap: 14px; }
  .intro-mark { font-size: 26px; }
  .causality-intro h2 { font-size: 18px; }
  .reconstruction-head { display: block; }
  .progress { display: inline-block; margin-top: 12px; }
  .event-grid { grid-template-columns: 1fr; }
  .event-card { min-height: 0; }
  .verdict-line { font-size: 14px; }
}