@keyframes _si{from{opacity:0}to{opacity:1}}

.legacy-content .phrase-grid { display: flex; flex-direction: column; gap: 12px; margin-top: 4px; }.legacy-content .phrase-card {
  background: var(--card); border: 1.5px solid var(--border);
  border-radius: var(--radius); padding: 18px 22px;
  cursor: pointer; transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
  box-shadow: var(--shadow-card);
}.legacy-content .phrase-card:hover { border-color: rgba(0,102,255,0.35); transform: translateY(-1px); }.legacy-content .phrase-card.open { border-color: rgba(0,102,255,0.45); box-shadow: var(--shadow-pop); cursor: default; }.legacy-content .phrase-q {
  display: flex; align-items: center; gap: 10px;
  font-size: 17px; font-weight: 800; color: var(--text);
}.legacy-content .phrase-q .tap-hint {
  margin-left: auto; font-size: 12px; font-weight: 700; color: var(--accent);
  background: rgba(0,102,255,0.07); padding: 3px 12px; border-radius: 999px;
  flex-shrink: 0; transition: opacity 0.3s;
}.legacy-content .phrase-card.open .tap-hint { opacity: 0; }.legacy-content .phrase-answers { max-height: 0; overflow: hidden; transition: max-height 0.5s ease; }.legacy-content .phrase-card.open .phrase-answers { max-height: 300px; }.legacy-content .answer-list { display: flex; flex-direction: column; gap: 7px; padding-top: 16px; }.legacy-content .answer-row { display: flex; align-items: center; gap: 10px; }.legacy-content .answer-word {
  width: 96px; font-size: 14px; font-weight: 700; color: var(--text);
  text-align: right; flex-shrink: 0;
}.legacy-content .answer-track { flex: 1; height: 22px; background: rgba(0,0,0,0.05); border-radius: 6px; overflow: hidden; }.legacy-content .answer-fill {
  height: 100%; border-radius: 6px; width: 0;
  transition: width 0.8s cubic-bezier(0.25,1,0.5,1);
}.legacy-content .answer-pct { width: 44px; font-size: 13px; font-weight: 800; flex-shrink: 0; }.legacy-content .phrase-note { font-size: 13px; color: var(--sub); padding-top: 12px; line-height: 1.7; }.legacy-content .phrase-note b { color: var(--accent); }.legacy-content .demo-box {
  background: var(--card); border: 1.5px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-card);
  overflow: hidden;
}.legacy-content .demo-head {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  padding: 14px 18px; border-bottom: 1px solid var(--border);
  background: rgba(0,0,0,0.015);
}.legacy-content .demo-head-label { font-size: 12px; font-weight: 800; color: var(--sub); margin-right: 4px; }.legacy-content .starter-chip {
  border: 1.5px solid var(--border); background: var(--card);
  border-radius: 999px; padding: 6px 16px;
  font-size: 13px; font-weight: 700; color: var(--text);
  cursor: pointer; transition: all 0.15s; font-family: inherit;
}.legacy-content .starter-chip:hover { border-color: rgba(0,102,255,0.4); }.legacy-content .starter-chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }.legacy-content .demo-body { padding: 22px 24px; min-height: 150px; }.legacy-content .demo-text { font-size: 17px; line-height: 2; color: var(--text); word-break: break-all; }.legacy-content .demo-text .starter-part { color: var(--sub); }.legacy-content .demo-text .ai-part { color: var(--text); font-weight: 600; }.legacy-content .demo-text .caret {
  display: inline-block; width: 2px; height: 1.1em; background: var(--accent);
  vertical-align: text-bottom; margin-left: 1px;
  animation: blink 0.85s step-end infinite;
}@keyframes blink{ 50% { opacity: 0; } }.legacy-content .decision-pop {
  margin: 14px 0 4px; padding: 14px 16px;
  background: rgba(0,102,255,0.045); border: 1.5px dashed rgba(0,102,255,0.35);
  border-radius: var(--radius-sm);
  opacity: 0; transform: translateY(6px);
  transition: opacity 0.3s, transform 0.3s;
}.legacy-content .decision-pop.show { opacity: 1; transform: translateY(0); }.legacy-content .decision-title { font-size: 12px; font-weight: 800; color: var(--accent); margin-bottom: 9px; letter-spacing: 0.3px; }.legacy-content .cand-list { display: flex; flex-direction: column; gap: 6px; }.legacy-content .cand-row { display: flex; align-items: center; gap: 9px; }.legacy-content .cand-word {
  min-width: 68px; text-align: center; padding: 2px 10px;   
  font-size: 14px; font-weight: 800; border-radius: 7px;
  background: rgba(0,0,0,0.05); color: var(--sub);
  transition: background 0.13s, color 0.13s, transform 0.13s;
}.legacy-content .cand-row.picked .cand-word { background: var(--accent); color: #fff; transform: scale(1.06); }.legacy-content .cand-track { flex: 1; height: 14px; background: rgba(0,0,0,0.05); border-radius: 5px; overflow: hidden; }.legacy-content .cand-fill { height: 100%; border-radius: 5px; background: rgba(0,0,0,0.16); width: 0; transition: width 0.14s cubic-bezier(0.25,1,0.5,1); }.legacy-content .cand-row.picked .cand-fill { background: var(--accent); }.legacy-content .cand-pct { width: 44px; font-size: 12px; font-weight: 800; color: var(--sub); flex-shrink: 0; font-variant-numeric: tabular-nums; }.legacy-content .cand-row.picked .cand-pct { color: var(--accent); }.legacy-content .demo-foot {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 14px 18px; border-top: 1px solid var(--border);
}.legacy-content .btn-run {
  background: var(--accent); color: #fff; border: none;
  padding: 10px 26px; border-radius: 999px;
  font-size: 14px; font-weight: 800; cursor: pointer; font-family: inherit;
  transition: filter 0.15s, transform 0.15s;
}.legacy-content .btn-run:hover:not(:disabled) { filter: brightness(1.08); transform: translateY(-1px); }.legacy-content .btn-run:disabled { background: #c4c8cf; cursor: not-allowed; }.legacy-content .demo-status { font-size: 12.5px; color: var(--sub); font-weight: 600; }.legacy-content .chat-truth { display: flex; flex-direction: column; gap: 10px; }.legacy-content .chat-row { display: flex; gap: 10px; align-items: flex-start; }.legacy-content .chat-row.user { flex-direction: row-reverse; }.legacy-content .chat-avatar {
  width: 34px; height: 34px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 800; color: #fff;
}.legacy-content .chat-row.user .chat-avatar { background: #64748b; }.legacy-content .chat-row.ai .chat-avatar { background: var(--accent); }.legacy-content .chat-bubble {
  max-width: 78%; padding: 10px 16px; border-radius: 14px;
  font-size: 14px; line-height: 1.7;
}.legacy-content .chat-row.user .chat-bubble { background: rgba(100,116,139,0.1); border-top-right-radius: 4px; }.legacy-content .chat-row.ai .chat-bubble { background: rgba(0,102,255,0.07); border-top-left-radius: 4px; }.legacy-content .chat-annotation {
  text-align: center; font-size: 12.5px; font-weight: 700; color: var(--amber);
  padding: 6px 0;
}.legacy-content .why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }.legacy-content .why-card {
  background: var(--card); border: 1.5px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px;
  box-shadow: var(--shadow-card);
}.legacy-content .why-card .why-icon { font-size: 26px; margin-bottom: 8px; }.legacy-content .why-card h4 { font-size: 15px; font-weight: 800; color: var(--text); margin-bottom: 6px; }.legacy-content .why-card p { font-size: 13px; color: var(--sub); line-height: 1.75; }.legacy-content .why-card p b { color: var(--text); }.legacy-content .math-box {
  background: var(--card); border: 1.5px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-card);
  padding: 20px 24px;
}.legacy-content .math-chips { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }.legacy-content .math-chip {
  border: 1.5px solid var(--border); background: var(--card);
  border-radius: 999px; padding: 8px 20px;
  font-size: 14px; font-weight: 700; color: var(--text);
  cursor: pointer; transition: all 0.15s; font-family: inherit;
  font-variant-numeric: tabular-nums;
}.legacy-content .math-chip:hover { border-color: rgba(0,102,255,0.4); }.legacy-content .math-chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }.legacy-content .math-stage { min-height: 170px; }.legacy-content .math-q { font-size: 17px; font-weight: 800; color: var(--text); margin-bottom: 12px; font-variant-numeric: tabular-nums; }.legacy-content .math-q .mq-hint { font-size: 12px; font-weight: 700; color: var(--sub); margin-left: 10px; }.legacy-content .math-cands { margin-bottom: 14px; }.legacy-content .math-cands .cand-word { min-width: 96px; font-variant-numeric: tabular-nums; }.legacy-content .math-verdict {
  font-size: 13px; line-height: 1.85; color: var(--sub);
  border-top: 1px dashed var(--border); padding-top: 12px;
  opacity: 0; transition: opacity 0.4s;
}.legacy-content .math-verdict.show { opacity: 1; }.legacy-content .math-verdict b { color: var(--text); }.legacy-content .math-verdict .mv-ok { color: var(--success); font-weight: 800; }.legacy-content .math-verdict .mv-bad { color: var(--danger); font-weight: 800; }.legacy-content .takeaway-box {
  background: linear-gradient(135deg, #eff6ff, #eef2ff);
  border: 1.5px solid #bfdbfe; border-radius: var(--radius);
  padding: 24px 28px; margin-top: 36px;
}.legacy-content .takeaway-box h3 { font-size: 17px; font-weight: 800; color: #1e40af; margin-bottom: 10px; }.legacy-content .takeaway-box ul { list-style: none; padding: 0; margin: 0; }.legacy-content .takeaway-box li {
  font-size: 14.5px; color: #1e3a5f; line-height: 1.8;
  padding: 4px 0 4px 22px; position: relative;
}.legacy-content .takeaway-box li::before {
  content: ''; position: absolute; left: 0; top: 13px;
  width: 8px; height: 8px; border-radius: 50%; background: #3b82f6;
}@media (max-width: 768px){.legacy-content .why-grid { grid-template-columns: 1fr; }.legacy-content .answer-word { width: 72px; font-size: 13px; }.legacy-content .demo-text { font-size: 15px; }.legacy-content .chat-bubble { max-width: 85%; }}

.legacy-content .xa-tldr {margin:18px 0 4px;padding:14px 18px;background:rgba(0,102,255,0.04);border:1px solid rgba(0,102,255,0.16);border-radius:10px}.legacy-content .xa-tldr .xa-tldr-tag {display:block;font-size:11px;font-weight:800;letter-spacing:1px;color:var(--accent,#0066ff);margin-bottom:6px}.legacy-content .xa-tldr p {margin:0;font-size:15px;line-height:1.8;color:var(--text,#1f2937)}