:root{
  --bg:#fffaf0;--card:#fff;--yellow:#ffd86b;--yellow-strong:#ffc13a;--yellow-light:#fff7d8;
  --yellow-dark:#9d6c00;--text:#28241c;--muted:#7d725c;--line:#efd89b;--shadow:0 18px 44px rgba(120,86,15,.09);
  --subject:#fff3c9;--subject-border:#ecd287;--core:#f6f1ff;--core-border:#d9c9f6;
  --extra:#eef8ef;--extra-border:#c6e3c8;--question:#e9f5ff;--question-border:#b8dcf6;--negative:#fff0e8;--negative-border:#f2c2aa;
}
*{box-sizing:border-box;min-width:0}body{margin:0;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:linear-gradient(135deg,#fff0b7 0,#fffaf0 38%,#ffe9a4 100%);overflow-x:hidden}button,input,select{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}.hidden{display:none!important}
.lesson-page{width:min(1480px,95%);margin:auto;padding:22px 0 55px}.topbar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:18px;margin-bottom:18px}.back-link,.unit-pill{width:max-content;padding:10px 15px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.88);font-weight:900;color:#73570f}.unit-pill{justify-self:end;background:var(--yellow-light)}.brand{display:flex;align-items:center;gap:11px;font-weight:900}.brand-icon{width:42px;height:42px;display:grid;place-items:center;border-radius:14px;background:linear-gradient(135deg,#ffd45f,#fff0ae);box-shadow:0 9px 20px rgba(255,183,35,.22)}.brand strong,.brand span{display:block}.brand span{font-size:12px;color:var(--muted)}
.main-card{padding:clamp(20px,3vw,38px);border:1px solid var(--line);border-radius:34px;background:linear-gradient(135deg,#fff 0,#fff9e5 100%);box-shadow:var(--shadow)}.intro{max-width:980px;margin-bottom:24px}.eyebrow,.panel-kicker{margin:0 0 8px;color:var(--yellow-dark);font-size:13px;font-weight:1000;text-transform:uppercase;letter-spacing:.05em}.intro h1{margin:0 0 10px;font-size:clamp(38px,5vw,64px);line-height:1.05}.intro p{margin:0;color:var(--muted);font-size:17px;line-height:1.75}
.workspace{display:grid;grid-template-columns:minmax(0,1fr) 355px;gap:20px;align-items:start}.main-column{display:flex;flex-direction:column;gap:20px}.panel{padding:22px;border:1px solid var(--line);border-radius:28px;background:rgba(255,255,255,.95);box-shadow:0 14px 34px rgba(120,86,15,.07)}.panel-head{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:18px}.panel h2{margin:0;font-size:27px}.builder-actions{display:flex;gap:8px}.small-btn,.add-word-btn{border:1px solid var(--line);border-radius:999px;padding:9px 14px;background:#fff;font-weight:900;color:#5f4a18}.primary-small,.add-word-btn{background:var(--yellow-light)}
.sentence-builder{display:flex;align-items:end;gap:10px;width:100%;padding:18px;border:1px solid var(--line);border-radius:22px;background:linear-gradient(135deg,#fffdf7,#fff6d1);overflow-x:auto}.builder-slot-wrap{flex:0 0 155px}.builder-slot-wrap.core-wrap{flex-basis:205px}.builder-slot-wrap.extra-wrap{flex-basis:220px}.balance-wrap{flex-basis:98px}.slot-label{display:block;margin:0 0 7px;font-size:12px;font-weight:900;color:#80641f}.drop-slot,.fixed-slot{height:62px;display:flex;align-items:center;justify-content:center;padding:8px 12px;border:2px dashed var(--line);border-radius:17px;background:#fff;white-space:nowrap}.fixed-slot{border-style:solid;background:var(--yellow);border-color:var(--yellow-strong);font-size:21px;font-weight:1000}.drop-slot.drag-over{transform:translateY(-3px);border-color:#d49a00;box-shadow:0 10px 22px rgba(218,157,0,.17)}.slot-placeholder{color:#af9e75;font-weight:800;font-size:14px}.builder-punctuation{padding-bottom:17px;font-size:28px;font-weight:1000}.builder-hint{margin-top:12px;color:var(--muted);font-size:13px}
.word-block,.slot-word{display:inline-flex;align-items:center;justify-content:center;gap:6px;border-radius:14px;font-weight:950}.slot-word{width:100%;height:100%;padding:7px 11px}.slot-word.subject,.word-block.subject{background:var(--subject);border:1px solid var(--subject-border)}.slot-word.core,.word-block.core{background:var(--core);border:1px solid var(--core-border)}.slot-word.extra,.word-block.extra{background:var(--extra);border:1px solid var(--extra-border)}
.transform-head{margin-bottom:14px}.be-badge{min-width:70px;padding:12px 16px;border:1px solid var(--yellow-strong);border-radius:19px;background:var(--yellow);text-align:center;font-size:22px;font-weight:1000}.transform-table{overflow-x:auto;border:1px solid var(--line);border-radius:18px;background:#fff;scrollbar-width:thin}.transform-row{display:grid;grid-template-columns:155px minmax(720px,1fr);align-items:stretch;min-height:88px;border-bottom:1px solid var(--line)}.transform-row:last-child{border-bottom:0}.transform-title{display:flex;flex-direction:column;justify-content:center;gap:4px;padding:15px 16px;border-right:1px solid var(--line);background:#fffdf6}.transform-title strong{font-size:17px}.transform-title span{color:var(--muted);font-size:12px;font-weight:800}.sentence-line{display:grid;grid-template-columns:repeat(6,minmax(112px,1fr));align-items:stretch;min-height:88px}.sentence-cell{display:flex;align-items:center;justify-content:center;min-width:0;padding:10px;border-right:1px solid var(--line);background:#fff}.sentence-cell:last-child{border-right:0}.sentence-cell.empty{background:#fffdf9}.word-cell{width:100%;min-height:56px;display:flex;align-items:center;justify-content:center;padding:8px 12px;border:2px solid var(--line);border-radius:15px;background:#fff;text-align:center;font-size:17px;font-weight:1000;line-height:1.2;white-space:nowrap;box-shadow:0 5px 12px rgba(120,86,15,.05)}.word-cell.subject{background:var(--subject);border-color:var(--subject-border)}.word-cell.balance{background:var(--yellow);border-color:var(--yellow-strong)}.word-cell.core{background:var(--core);border-color:var(--core-border)}.word-cell.extra{background:var(--extra);border-color:var(--extra-border)}.word-cell.question{background:var(--question);border-color:var(--question-border)}.word-cell.not{background:var(--negative);border-color:var(--negative-border)}.word-cell.punctuation{max-width:58px;margin:auto;padding-inline:10px;border-style:dashed;background:#fff}.status-box{margin-top:16px;padding:13px 15px;border-radius:15px;background:var(--yellow-light);color:#6f571c;font-weight:800;font-size:13px}
.vocabulary-panel{position:sticky;top:18px;max-height:calc(100vh - 36px);overflow:auto}.add-word-btn{border:0;background:var(--yellow);color:#4e3800}.vocab-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin-bottom:14px}.vocab-tabs button{border:1px solid var(--line);border-radius:12px;padding:9px;background:#fff;font-weight:900;color:#77643a}.vocab-tabs button.active{background:var(--yellow);border-color:var(--yellow-strong);color:#3f2e04}.vocab-list{display:flex;flex-wrap:wrap;gap:9px;min-height:130px;align-content:flex-start}.word-block{padding:9px 12px;font-size:14px;cursor:grab;user-select:none}.word-block:active{cursor:grabbing}.word-block small{font-size:10px;color:#7c7058}.word-block:hover{transform:translateY(-2px);box-shadow:0 8px 16px rgba(120,86,15,.1)}
.add-word-panel{margin-top:18px;padding:16px;border:1px solid var(--line);border-radius:20px;background:#fffaf0}.add-word-head{display:flex;justify-content:space-between;gap:12px;margin-bottom:12px}.add-word-head strong,.add-word-head span{display:block}.add-word-head span{margin-top:3px;color:var(--muted);font-size:11px}.add-word-head button{border:0;background:transparent;font-size:24px}.search-row{display:grid;grid-template-columns:1fr auto;gap:8px}.search-row input,.save-word-box select{width:100%;border:1px solid var(--line);border-radius:13px;padding:11px 12px;background:#fff;font-weight:800}.search-row button,.save-word-btn{border:0;border-radius:13px;padding:10px 14px;background:var(--yellow);font-weight:950}.lookup-status{margin:11px 0;color:var(--muted);font-size:12px;line-height:1.55}.sense-results{display:flex;flex-direction:column;gap:9px;max-height:330px;overflow:auto}.sense-card{padding:11px;border:1px solid #e4d8f5;border-radius:14px;background:#faf7ff}.sense-top{display:flex;justify-content:space-between;gap:9px;margin-bottom:6px}.pos-badge{padding:3px 8px;border-radius:999px;background:#ede4ff;color:#644c91;font-size:11px;font-weight:900}.candidate-tags{display:flex;flex-wrap:wrap;gap:5px}.candidate-tag{padding:3px 7px;border-radius:999px;background:#eef8ef;color:#417244;font-size:10px;font-weight:900}.sense-definition{margin:0;color:#615a4c;font-size:12px;line-height:1.5}.save-word-box{margin-top:13px;padding-top:13px;border-top:1px dashed var(--line)}.save-word-box label{display:block;font-size:12px;font-weight:900}.save-word-box select{margin-top:6px}.save-word-box p{color:var(--muted);font-size:11px;line-height:1.5}.save-word-btn{width:100%}.learned-box{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:18px;padding:13px;border-radius:16px;background:var(--yellow-light)}.learned-box strong,.learned-box span{display:block}.learned-box span{font-size:11px;color:var(--muted)}.learned-box button{border:1px solid var(--line);border-radius:999px;padding:7px 10px;background:#fff;color:#765d21;font-weight:850}.attribution{margin:15px 2px 0;color:#8a7d61;font-size:10px;line-height:1.55}
@media(max-width:1050px){.workspace{grid-template-columns:1fr}.vocabulary-panel{position:static;max-height:none}.sentence-builder{padding-bottom:12px}}
@media(max-width:680px){.lesson-page{width:96%}.topbar{grid-template-columns:auto 1fr}.brand{justify-self:end}.unit-pill{display:none}.main-card{padding:16px;border-radius:24px}.panel{padding:16px;border-radius:22px}.transform-row{grid-template-columns:125px minmax(680px,1fr)}.transform-title{padding:12px}.sentence-builder{padding:13px}.builder-slot-wrap{flex-basis:135px}.builder-slot-wrap.core-wrap{flex-basis:170px}.builder-slot-wrap.extra-wrap{flex-basis:185px}.word-cell{font-size:15px;min-height:50px;padding:7px 13px}.word-cell.subject{min-width:100px}.word-cell.core{min-width:125px}.word-cell.extra{min-width:145px}}

/* 统一词库 */
.vocab-note{
  margin-bottom:14px;
  padding:11px 12px;
  border:1px solid var(--line);
  border-radius:14px;
  background:var(--yellow-light);
  color:#70591f;
  font-size:12px;
  font-weight:750;
  line-height:1.55;
}
.word-block.subject{background:var(--subject);border:1px solid var(--subject-border)}
.word-block.core{background:var(--core);border:1px solid var(--core-border)}
.word-block.extra{background:var(--extra);border:1px solid var(--extra-border)}

/* 统一词库搜索 */
.vocab-search-box{margin:0 0 15px}.vocab-search-row{display:grid;grid-template-columns:minmax(0,1fr) 42px;gap:8px}.vocab-search-row input{width:100%;height:46px;padding:0 14px;border:1px solid var(--line);border-radius:14px;background:#fffdf7;color:var(--text);font-weight:750;outline:none}.vocab-search-row input:focus{border-color:var(--yellow-strong);box-shadow:0 0 0 4px rgba(255,193,58,.14)}.vocab-search-row button{border:1px solid var(--line);border-radius:14px;background:#fff;color:#80641f;font-size:22px;font-weight:900}.vocab-search-status{min-height:22px;margin-top:7px;color:var(--muted);font-size:12px;line-height:1.5}.vocab-empty{grid-column:1/-1;padding:18px;border:1px dashed var(--line);border-radius:18px;background:#fffaf0;text-align:center}.vocab-empty strong,.vocab-empty span{display:block}.vocab-empty strong{margin-bottom:5px;font-size:16px}.vocab-empty span{color:var(--muted);font-size:13px}.go-add-btn{margin-top:12px;padding:9px 17px;border:1px solid var(--yellow-strong);border-radius:999px;background:var(--yellow);color:#513b00;font-weight:1000;box-shadow:0 8px 18px rgba(255,193,58,.2)}

.add-word-success{margin-top:10px;padding:10px 12px;border:1px solid #b9dfbd;border-radius:12px;background:#eef9ef;color:#2f7137;text-align:center;font-size:14px;font-weight:1000;animation:addSuccessPop .28s ease-out}
@keyframes addSuccessPop{from{opacity:0;transform:translateY(5px) scale(.98)}to{opacity:1;transform:none}}

/* 句子中的词块可再次拖动 */
.slot-word {
  cursor: grab;
  user-select: none;
}

.slot-word:active,
.slot-word.is-dragging {
  cursor: grabbing;
}

.slot-word.is-dragging {
  opacity: 0.45;
}

/* 拖回词库时提示这是移除区域 */
.vocabulary-panel.remove-drop-active {
  outline: 3px dashed #e4ad23;
  outline-offset: -8px;
  background: linear-gradient(180deg, #fffdf7, #fff5cc);
}

.vocabulary-panel.remove-drop-active::before {
  content: "松开即可从句子中移除";
  display: block;
  margin: 0 0 12px;
  padding: 10px 14px;
  border: 1px dashed #d99c00;
  border-radius: 12px;
  color: #8b6200;
  background: #fff3bf;
  font-weight: 800;
  text-align: center;
}

/* =========================================================
   统一词库：颜色只由语义类别决定，不由默认句子位置决定
   ========================================================= */
.word-block.category-person {
  background: #fff3c9;
  border: 1px solid #ecd287;
}

.word-block.category-animal {
  background: #fff7dc;
  border: 1px solid #e7cf82;
}

.word-block.category-job {
  background: #f6f1ff;
  border: 1px solid #d9c9f6;
}

.word-block.category-thing {
  background: #fff8e7;
  border: 1px solid #ead29a;
}

.word-block.category-state {
  background: #f6f1ff;
  border: 1px solid #d9c9f6;
}

.word-block.category-color {
  background: #eef8ef;
  border: 1px solid #c6e3c8;
}

.word-block.category-age {
  background: #f6f1ff;
  border: 1px solid #d9c9f6;
}

.word-block.category-place,
.word-block.category-time,
.word-block.category-reason,
.word-block.category-manner {
  background: #eef8ef;
  border: 1px solid #c6e3c8;
}

.word-block.category-quantity,
.word-block.category-price {
  background: #eaf5ff;
  border: 1px solid #bddcf2;
}

.word-block.category-unknown {
  background: #f5f5f5;
  border: 1px solid #d7d7d7;
}

/* =========================================================
   问号云句子变形器
   ========================================================= */
.interactive-transform-panel{overflow:hidden}.transform-instruction{margin:-2px 0 18px;color:var(--muted);font-size:13px;font-weight:750;line-height:1.65}.cloud-stage{display:grid;grid-template-columns:180px minmax(0,1fr);gap:20px;align-items:center;padding:22px;border:1px solid #eadcae;border-radius:24px;background:linear-gradient(135deg,#fffdf6,#fff7d7);position:relative}.question-cloud{position:relative;width:150px;height:104px;margin:auto;display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:grab;user-select:none;filter:drop-shadow(0 12px 13px rgba(116,92,27,.16));transition:transform .2s ease}.question-cloud:active{cursor:grabbing}.question-cloud:hover,.question-cloud:focus-visible{transform:translateY(-5px) rotate(-1deg);outline:none}.question-cloud::before{content:"";position:absolute;inset:29px 9px 7px;border:2px solid #c7b2ec;border-radius:45px;background:#fff;z-index:0}.cloud-puff{position:absolute;border:2px solid #c7b2ec;border-radius:50%;background:#fff;z-index:0}.puff-one{width:62px;height:62px;left:18px;top:19px}.puff-two{width:76px;height:76px;left:47px;top:7px}.puff-three{width:55px;height:55px;right:11px;top:26px}.question-cloud strong,.question-cloud small{position:relative;z-index:2}.question-cloud strong{margin-top:4px;color:#7653b5;font-size:40px;line-height:.9}.question-cloud small{margin-top:8px;color:#776695;font-size:11px;font-weight:950}.question-cloud.is-dragging{opacity:.58;transform:scale(.94)}.completed-area{min-width:0}.stage-label{display:block;margin-bottom:9px;color:#8a7131;font-size:12px;font-weight:950;letter-spacing:.06em}.completed-sentence{min-height:98px;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:7px;padding:18px;border:2px dashed #dec777;border-radius:20px;background:#fff;transition:.22s ease}.completed-sentence.cloud-over{border-color:#8f6bc8;background:#faf7ff;box-shadow:0 0 0 5px rgba(143,107,200,.11)}.completed-token{position:relative;padding:10px 5px 8px;border-radius:11px;font-size:24px;font-weight:950;line-height:1.25;cursor:pointer;transition:.18s ease}.completed-token::after{content:"";position:absolute;left:5px;right:5px;bottom:2px;height:4px;border-radius:99px;opacity:.55}.completed-token.subject::after{background:var(--subject-border)}.completed-token.balance::after{background:var(--yellow-strong)}.completed-token.core::after{background:var(--core-border)}.completed-token.extra::after{background:var(--extra-border)}.completed-token.punctuation::after{display:none}.completed-token:hover,.completed-token.cloud-over{transform:translateY(-5px);background:#faf7ff;box-shadow:0 8px 18px rgba(92,64,133,.12)}.completed-token.cloud-over{outline:2px dashed #9270ca}.cloud-hint{margin-top:10px;color:#887a5d;font-size:12px;font-weight:750;text-align:center}.transformation-flow{margin-top:15px}.flow-arrow{text-align:center;color:#9a7d34;font-size:11px;font-weight:900}.flow-arrow span{margin-right:8px}.result-stream{display:flex;flex-direction:column;gap:11px;margin-top:9px}.result-empty{padding:18px;border:1px dashed var(--line);border-radius:17px;color:var(--muted);background:#fffdf8;text-align:center;font-weight:800}.transform-result{display:grid;grid-template-columns:112px 1fr auto;gap:13px;align-items:center;padding:14px 16px;border:1px solid #dfd3ef;border-radius:18px;background:#fff;box-shadow:0 9px 20px rgba(98,68,139,.07);animation:resultFall .48s cubic-bezier(.2,.82,.25,1)}.transform-result-label{color:#7653b5;font-size:12px;font-weight:1000}.transform-result-sentence{font-size:21px;font-weight:950}.transform-result-badge{padding:6px 10px;border-radius:999px;background:#f4edff;color:#7653b5;font-size:11px;font-weight:950}@keyframes resultFall{0%{opacity:0;transform:translateY(-40px) scale(.97)}70%{transform:translateY(5px) scale(1.01)}100%{opacity:1;transform:none}}.completed-sentence.is-transforming{animation:sentencePulse .48s ease}@keyframes sentencePulse{50%{transform:scale(1.025);box-shadow:0 0 0 8px rgba(255,193,58,.12)}}.legacy-transform-output{display:none!important}
@media(max-width:680px){.cloud-stage{grid-template-columns:1fr;padding:17px}.question-cloud{width:138px;height:94px}.completed-token{font-size:19px}.transform-result{grid-template-columns:1fr auto}.transform-result-label{grid-column:1/-1}.transform-result-sentence{font-size:17px}}

/* 问号与否定句 X 共用同一组句子变形工具。 */
.transform-view-switcher{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:min(300px,100%);margin:0 0 18px;padding:5px;border:1px solid #dfd3ef;border-radius:16px;background:#faf7ff;box-shadow:inset 0 1px 3px rgba(84,58,120,.05)}
.transform-view-switcher button{min-height:42px;padding:8px 18px;border:0;border-radius:12px;background:transparent;color:#7b6796;font-weight:950;transition:background .2s ease,color .2s ease,box-shadow .2s ease,transform .2s ease}
.transform-view-switcher button:hover{color:#68449f}.transform-view-switcher button:focus-visible{outline:3px solid rgba(143,107,200,.22);outline-offset:1px}
.transform-view-switcher button.active{background:#fff;color:#68449f;box-shadow:0 5px 13px rgba(91,62,132,.11)}
.transform-view[hidden]{display:none!important}
.table-view-note{margin:0 0 13px;padding:10px 13px;border:1px solid #eadcae;border-radius:14px;background:#fffaf0;color:#806a34;font-size:12px;font-weight:750;line-height:1.55}
.cloud-stage{grid-template-columns:145px minmax(0,1fr);gap:14px;padding:18px}
.transform-tools{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px;min-width:0}
.transform-tools .question-cloud{width:118px;height:82px;flex:0 0 82px}
.transform-tools .question-cloud::before{inset:23px 7px 5px;border-radius:38px}
.transform-tools .puff-one{width:47px;height:47px;left:12px;top:15px}
.transform-tools .puff-two{width:58px;height:58px;left:35px;top:4px}
.transform-tools .puff-three{width:42px;height:42px;right:7px;top:21px}
.transform-tools .question-cloud strong{margin-top:3px;font-size:31px}
.transform-tools .question-cloud small{margin-top:6px;font-size:9px}
.negative-cross{width:92px;height:70px;flex:0 0 70px;display:flex;flex-direction:column;align-items:center;justify-content:center;border:2px solid #efb39b;border-radius:24px;background:linear-gradient(145deg,#fff,#fff0e8);color:#b84d2c;cursor:grab;user-select:none;box-shadow:0 9px 17px rgba(180,77,44,.12);transition:transform .2s ease,box-shadow .2s ease,opacity .2s ease}
.negative-cross:hover,.negative-cross:focus-visible{transform:translateY(-5px) rotate(1deg);outline:none;box-shadow:0 16px 28px rgba(180,77,44,.18)}
.negative-cross:active{cursor:grabbing}.negative-cross.is-dragging{opacity:.58;transform:scale(.94)}
.negative-cross strong{font-size:34px;line-height:.8}.negative-cross small{margin-top:8px;font-size:9px;font-weight:950}
.completed-sentence.negative-over{border-color:#e18461;background:#fff4ee;box-shadow:0 0 0 6px rgba(225,132,97,.14)}
.completed-sentence.negative-over .completed-token{transform:translateY(-3px);background:#fff;box-shadow:0 7px 16px rgba(167,73,42,.1)}
.process-token.balance.negative-balance{border-color:var(--negative-border);background:var(--negative);color:#9d3f22}
@media(max-width:680px){.transform-view-switcher{width:100%}.cloud-stage{grid-template-columns:112px minmax(0,1fr);gap:9px;padding:12px}.transform-tools{gap:6px}.transform-tools .question-cloud{width:104px;height:76px;flex-basis:76px}.negative-cross{width:84px;height:64px;flex-basis:64px}.negative-cross strong{font-size:31px}}

/* 句子变形过程：每次只显示当前原句的一次变形，原句改变后自动清空。 */
.transform-process-card{padding:18px;border:1px solid #dfd3ef;border-radius:22px;background:#fff;box-shadow:0 12px 28px rgba(98,68,139,.08);animation:processCardIn .35s ease both}
.transform-process-label{margin-bottom:13px;color:#7653b5;font-size:13px;font-weight:1000}
.process-row{display:grid;grid-template-columns:70px minmax(0,1fr);gap:14px;align-items:center;min-height:78px;padding:12px 14px;border-radius:17px}
.source-row{background:#fffaf0;border:1px solid #f0dfae}
.target-row{background:#faf7ff;border:1px solid #dfd3ef}
.process-row-title{color:#8c743b;font-size:13px;font-weight:1000;text-align:center}
.target-row .process-row-title{color:#7653b5}
.process-words{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:9px;min-width:0}
.process-token{position:relative;display:inline-flex;align-items:center;justify-content:center;padding:10px 14px;border:2px solid transparent;border-radius:14px;background:#fff;font-size:21px;font-weight:950;line-height:1.15;box-shadow:0 5px 12px rgba(44,35,20,.06)}
.process-token.subject{border-color:var(--subject-border);background:var(--subject)}
.process-token.balance{border-color:var(--yellow-strong);background:var(--yellow)}
.process-token.core{border-color:var(--core-border);background:var(--core)}
.process-token.extra{border-color:var(--extra-border);background:var(--extra)}
.process-token.question{border-color:#b99be8;background:#f3edff;color:#68449f}
.process-token.punctuation{padding-inline:10px;border-style:dashed;background:#fff}
.source-row .process-token{animation:sourceSettle .35s ease both;animation-delay:calc(var(--token-order) * 45ms)}
.source-row .process-token.is-asked{animation:askedPulse .75s ease .25s both}
.target-token{opacity:0;transform:translateY(-30px) scale(.9);animation:targetDrop .55s cubic-bezier(.2,.82,.25,1) both;animation-delay:calc(.65s + var(--token-order) * 110ms)}
.process-motion{display:flex;align-items:center;justify-content:center;gap:10px;height:38px;color:#9a7d34;font-size:11px;font-weight:950;overflow:hidden}
.process-motion span{width:48px;height:1px;background:#dec777;animation:lineGrow .45s ease .35s both}
.process-motion b{opacity:0;animation:motionLabel .4s ease .35s both}
@keyframes processCardIn{from{opacity:0;transform:translateY(-12px)}to{opacity:1;transform:none}}
@keyframes sourceSettle{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}
@keyframes askedPulse{0%{transform:none;box-shadow:0 5px 12px rgba(44,35,20,.06)}45%{transform:translateY(-8px) scale(1.08);box-shadow:0 0 0 7px rgba(143,107,200,.14)}100%{transform:scale(.92);opacity:.35;filter:grayscale(.3)}}
@keyframes targetDrop{0%{opacity:0;transform:translateY(-34px) scale(.9)}70%{opacity:1;transform:translateY(4px) scale(1.03)}100%{opacity:1;transform:none}}
@keyframes lineGrow{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes motionLabel{from{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:none}}
@media(max-width:680px){.process-row{grid-template-columns:1fr;gap:7px}.process-row-title{text-align:left}.process-token{font-size:17px;padding:8px 10px}.process-words{justify-content:flex-start}.process-motion span{width:24px}}

/* 真实词块位移动画：旧词块从上行坐标飞到下行对应坐标 */
.transform-process-card{position:relative;overflow:visible}
.target-row .process-words.is-waiting .process-token{visibility:hidden}
.moving-token{position:absolute!important;z-index:30;margin:0!important;pointer-events:none;will-change:transform;box-shadow:0 14px 28px rgba(75,53,20,.18)!important}
.token-origin-hidden,.token-target-hidden{visibility:hidden!important}
.source-row{transition:opacity .35s ease,filter .35s ease}
.source-row.source-faded{opacity:.46;filter:saturate(.7)}
.new-target-token{opacity:0;transform:translateY(-24px) scale(.9)}
.new-target-token.is-arriving{animation:newQuestionTokenArrive .48s cubic-bezier(.2,.82,.22,1) calc(var(--new-order,0) * 55ms) forwards}
@keyframes newQuestionTokenArrive{0%{opacity:0;transform:translateY(-28px) scale(.88)}70%{opacity:1;transform:translateY(4px) scale(1.04)}100%{opacity:1;transform:none}}

/* 所有词块都使用 GPU 位移动画，避免提问核心/地点时出现卡顿。 */
.transform-process-card{position:relative;overflow:visible;contain:layout style}
.moving-token{position:absolute!important;margin:0!important;pointer-events:none;will-change:transform;transform:translate3d(0,0,0);backface-visibility:hidden;z-index:30}
.motion-running .process-token{pointer-events:none}
.token-origin-hidden,.token-target-hidden{visibility:hidden!important}
.token-leaving{animation:tokenLeave 3s ease forwards!important}
@keyframes tokenLeave{to{opacity:0;transform:translateY(22px) scale(.86)}}
.moving-token.will-morph{box-shadow:0 11px 25px rgba(107,75,162,.18)}
.moving-token.morph-finished{animation:morphFlash .18s ease both}
@keyframes morphFlash{0%{filter:brightness(1)}50%{filter:brightness(1.14)}100%{filter:brightness(1)}}
.target-row .process-words.is-waiting .process-token{visibility:hidden}
.new-target-token.is-arriving{animation:newTokenArrive .48s cubic-bezier(.2,.8,.2,1) both;animation-delay:calc(var(--new-order) * 55ms)}
@keyframes newTokenArrive{from{opacity:0;transform:translateY(-20px) scale(.82)}to{opacity:1;transform:none}}

/* 三类折叠词库 */
.vocab-list{display:flex;flex-direction:column;gap:10px;overflow-y:auto;min-height:0;padding-right:4px}
.vocab-accordion{border:1px solid #eadfb9;border-radius:17px;background:#fffdf7;overflow:hidden;flex:0 0 auto}
.vocab-accordion-head{width:100%;display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;padding:12px 13px;border:0;background:linear-gradient(135deg,#fffdf8,#fff4ca);color:var(--text);text-align:left;cursor:pointer}
.vocab-accordion-head:hover{background:linear-gradient(135deg,#fff9e8,#ffedaa)}
.accordion-number{display:grid;place-items:center;width:30px;height:30px;border-radius:10px;background:#ffd45f;font-weight:1000}
.accordion-copy{display:flex;flex-direction:column;gap:2px}.accordion-copy strong{font-size:15px}.accordion-copy small{color:#8d7b56;font-size:10px;font-weight:800}
.accordion-chevron{font-size:22px;font-weight:900;transition:transform .22s ease}.vocab-accordion-head[aria-expanded="true"] .accordion-chevron{transform:rotate(180deg)}
.vocab-accordion-body{display:flex;flex-wrap:wrap;gap:8px;padding:11px;border-top:1px solid #efe5c5;background:#fff}
.vocab-accordion-body[hidden]{display:none}
.vocab-accordion-subject .accordion-number{background:#f0e8ff;color:#7653b5}.vocab-accordion-core .accordion-number{background:#ffe37d;color:#6b5000}.vocab-accordion-extra .accordion-number{background:#e2f4e4;color:#39734a}

/* 句子级 FLIP 动画层：脱离布局、全部词块同时由 GPU 平移 */
.sentence-motion-overlay{position:absolute;left:0;top:0;width:100%;height:100%;z-index:9999;pointer-events:none;contain:layout style}
.sentence-motion-overlay .moving-token{position:absolute!important;margin:0!important;pointer-events:none;will-change:transform,opacity;backface-visibility:hidden;transform:translate3d(0,0,0);box-shadow:0 13px 25px rgba(75,53,20,.16)!important;filter:none!important}
.transform-process-card.motion-running .process-row,.transform-process-card.motion-running .process-motion{pointer-events:none}
.token-origin-hidden,.token-target-hidden{visibility:hidden!important}
.target-row .process-token.new-target-token{opacity:0}
.target-row .process-token.new-target-token.is-arriving{animation:newTokenArrive .28s ease both}
.source-row.source-faded{opacity:.55;transition:opacity .25s ease}
@media(prefers-reduced-motion:reduce){
  .transform-process-card,.source-row .process-token,.source-row .process-token.is-asked,.target-token,.token-leaving,.new-target-token.is-arriving,.completed-sentence.is-transforming{animation:none!important;transition:none!important}
  .target-token{opacity:1!important;transform:none!important}
}
@media(max-width:680px){.vocab-accordion-head{padding:10px}.vocab-accordion-body{gap:6px;padding:9px}}