:root {
  --bg: #0b1020;
  --bg-soft: #121933;
  --card: #161f3a;
  --card-border: rgba(148, 163, 184, 0.14);
  --text: #e8edf7;
  --muted: #94a3b8;
  --accent: #60a5fa;
  --accent-2: #34d399;
  --warn: #fbbf24;
  --danger: #f87171;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(96, 165, 250, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(52, 211, 153, 0.12), transparent 24%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.page {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.hero {
  padding: 24px 0 12px;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 10px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.1;
}

.hero h1 span {
  color: var(--accent-2);
}

.lead {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.05rem;
  margin-top: 16px;
}

.card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 20px;
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 16px;
  font-size: 1.35rem;
}

.flow {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
  align-items: stretch;
}

.flow-step {
  background: var(--bg-soft);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 14px;
  min-height: 120px;
}

.flow-step.highlight {
  border-color: rgba(52, 211, 153, 0.45);
  background: rgba(52, 211, 153, 0.08);
}

.flow-step .num {
  display: inline-flex;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(96, 165, 250, 0.18);
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 8px;
}

.flow-step p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 1.4rem;
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.compare-item {
  border-radius: 14px;
  padding: 16px;
  border: 1px solid var(--card-border);
}

.compare-item.weak {
  background: rgba(248, 113, 113, 0.08);
  border-color: rgba(248, 113, 113, 0.25);
}

.compare-item.strong {
  background: rgba(52, 211, 153, 0.08);
  border-color: rgba(52, 211, 153, 0.25);
}

.compare-item h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.question {
  color: var(--muted);
  margin: 0;
}

.prompt-box {
  margin-top: 18px;
  background: #0a1228;
  border: 1px solid var(--card-border);
  border-radius: 14px;
  overflow: hidden;
}

.prompt-label {
  padding: 10px 14px;
  font-size: 0.85rem;
  color: var(--accent);
  border-bottom: 1px solid var(--card-border);
}

pre {
  margin: 0;
  padding: 16px;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.92rem;
  color: #cbd5e1;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 18px;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 12px 20px;
  font-size: 0.98rem;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn.primary {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: white;
}

.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--card-border);
}

.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

.status {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(96, 165, 250, 0.08);
  border: 1px solid rgba(96, 165, 250, 0.18);
  color: #bfdbfe;
}

.chains {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.chain-card {
  background: var(--bg-soft);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 16px;
  min-height: 280px;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.35s ease, transform 0.35s ease, border-color 0.25s ease;
}

.chain-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.chain-card.winner {
  border-color: rgba(52, 211, 153, 0.55);
  box-shadow: 0 0 0 1px rgba(52, 211, 153, 0.2);
}

.chain-card.wrong {
  border-color: rgba(248, 113, 113, 0.45);
}

.chain-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
  margin-bottom: 10px;
}

.chain-title {
  font-weight: 700;
}

.badge {
  font-size: 0.78rem;
  padding: 4px 8px;
  border-radius: 999px;
  white-space: nowrap;
}

.badge.pending {
  background: rgba(148, 163, 184, 0.15);
  color: var(--muted);
}

.badge.thinking {
  background: rgba(96, 165, 250, 0.18);
  color: #bfdbfe;
}

.badge.correct {
  background: rgba(52, 211, 153, 0.18);
  color: #86efac;
}

.badge.wrong {
  background: rgba(248, 113, 113, 0.18);
  color: #fca5a5;
}

.chain-steps {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step {
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid transparent;
  color: #cbd5e1;
  font-size: 0.92rem;
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.step.show {
  opacity: 1;
  transform: translateX(0);
}

.step.answer {
  margin-top: 4px;
  font-weight: 700;
  color: var(--text);
  border-color: rgba(96, 165, 250, 0.25);
}

.step.answer.correct {
  border-color: rgba(52, 211, 153, 0.35);
  background: rgba(52, 211, 153, 0.08);
}

.step.answer.wrong {
  border-color: rgba(248, 113, 113, 0.35);
  background: rgba(248, 113, 113, 0.08);
}

.vote-panel {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--card-border);
}

.vote-panel.hidden {
  display: none;
}

.vote-panel h3 {
  margin: 0 0 14px;
}

.vote-bars {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.vote-row {
  display: grid;
  grid-template-columns: 80px 1fr 72px;
  gap: 12px;
  align-items: center;
}

.vote-label {
  font-weight: 700;
}

.bar-track {
  height: 14px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 999px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  width: 0;
  border-radius: 999px;
  transition: width 0.6s ease;
}

.bar-fill.a24 {
  background: linear-gradient(90deg, #ef4444, #f87171);
}

.bar-fill.a47 {
  background: linear-gradient(90deg, #10b981, #34d399);
}

.vote-count {
  color: var(--muted);
  text-align: right;
}

.final-answer {
  margin-top: 16px;
  padding: 16px;
  border-radius: 14px;
  background: rgba(52, 211, 153, 0.1);
  border: 1px solid rgba(52, 211, 153, 0.28);
}

.final-answer strong {
  color: #86efac;
  font-size: 1.2rem;
}

.takeaway ul {
  margin: 0;
  padding-left: 20px;
  color: #cbd5e1;
}

.takeaway li + li {
  margin-top: 8px;
}

footer {
  text-align: center;
  color: var(--muted);
  margin-top: 28px;
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .flow {
    grid-template-columns: 1fr;
  }

  .flow-arrow {
    transform: rotate(90deg);
  }

  .compare-grid,
  .chains {
    grid-template-columns: 1fr;
  }
}