/* ============ 互动实验室 & 知识串讲 ============ */

/* ---- 通用外壳 ---- */
.lab-wrap{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;margin-bottom:16px;
}
.lab-head{padding:16px 18px 12px;border-bottom:1px solid var(--line-2);display:flex;gap:14px;align-items:flex-start;flex-wrap:wrap}
.lab-head h2{font-size:17px}
.lab-head p{font-size:12.5px;color:var(--muted);margin-top:3px;line-height:1.6}
.scene-tabs{margin-left:auto;display:flex;gap:6px;background:var(--line-2);padding:3px;border-radius:11px}
.scene-tabs button{
  padding:7px 13px;border-radius:9px;font-size:13px;font-weight:600;color:var(--muted);white-space:nowrap;transition:.16s;
}
.scene-tabs button.on{background:#fff;color:var(--accent);box-shadow:0 1px 4px rgba(22,33,58,.12)}

/* ---- 视图切换条（符号图 / 实物图 / 3D 立体） ---- */
.view-bar{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  padding:9px 18px;border-bottom:1px solid var(--line-2);
  background:linear-gradient(180deg,#fafcff,#f5f9fd);
}
.vb-tip{font-size:12px;font-weight:700;color:var(--muted);letter-spacing:.5px}
.view-tabs{display:flex;gap:5px;background:var(--line-2);padding:3px;border-radius:10px}
.view-tabs button{
  padding:5px 12px;border-radius:8px;font-size:12.5px;font-weight:600;color:var(--muted);
  white-space:nowrap;transition:.16s;
}
.view-tabs button:hover{color:var(--ink-2)}
.view-tabs button.on{background:#fff;color:var(--accent);box-shadow:0 1px 4px rgba(22,33,58,.12)}
.vb-hint{margin-left:auto;font-size:11.5px;color:var(--muted)}

/* ---- 三种视图的图形差异 ---- */
.circuit-svg.real-svg{background:#fdfefe}
.circuit-svg.iso-svg{background:#e8eff8}
.wire3d{fill:none;stroke:#8b9ab1;stroke-width:4.6;stroke-linecap:round;stroke-linejoin:round;
  filter:drop-shadow(1.5px 2px 1.6px rgba(22,33,58,.22))}
.wire3d.static{stroke:#a9b6c8}
.clabel.iso{font-size:11.5px;fill:#5b6a82}
.iso-svg .eflow{filter:drop-shadow(0 0 3px var(--accent))}

/* ---- 分段选择器 / 提示（数学实验室用） ---- */
.seg-row{display:flex;gap:5px;background:var(--line-2);padding:3px;border-radius:10px;flex-wrap:wrap}
.seg-row button{
  flex:1 1 auto;padding:6px 10px;border-radius:8px;font-size:12.5px;font-weight:600;
  color:var(--muted);white-space:nowrap;transition:.16s;
}
.seg-row button:hover{color:var(--ink-2)}
.seg-row button.on{background:#fff;color:var(--accent);box-shadow:0 1px 4px rgba(22,33,58,.12)}
.ctl-tip{font-size:11.5px;color:var(--muted);line-height:1.6;padding:2px 2px 0}
.lab-body{display:flex;align-items:stretch}
.circuit-stage{
  flex:1 1 58%;min-width:0;position:relative;
  background:radial-gradient(circle at 50% 40%,#fbfdff 0%,#f4f8fd 70%,#eef4fb 100%);
  border-right:1px solid var(--line-2);display:flex;align-items:center;
}
.circuit-svg{width:100%;height:auto;display:block}
.stage-tip{
  position:absolute;left:14px;top:12px;font-size:11.5px;font-weight:600;color:var(--muted);
  background:rgba(255,255,255,.8);padding:4px 10px;border-radius:20px;border:1px solid var(--line);
}
.lab-panel{flex:1 1 42%;min-width:0;padding:14px 16px 16px;display:flex;flex-direction:column;gap:12px}

/* ---- 电路元件 ---- */
.wire{fill:none;stroke:#94a3b8;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}
.wire.static{stroke:#94a3b8}
.vwire{stroke:#94a3b8;stroke-width:1.6;stroke-dasharray:4 3;fill:none}
.eflow{fill:var(--accent);filter:drop-shadow(0 0 3px var(--accent))}
.clabel{font-size:12.5px;fill:var(--muted);font-weight:600}
.clabel.mid{text-anchor:middle}
.bulb .fil{transition:stroke .25s}
.bulb.lit .halo{animation:glowPulse 2.4s ease-in-out infinite}
@keyframes glowPulse{0%,100%{opacity:1}50%{opacity:.78}}

/* ---- 读数与控制 ---- */
.readout{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.ro-item{
  background:#f8fafd;border:1px solid var(--line-2);border-radius:10px;padding:8px 11px;
  display:flex;flex-direction:column;gap:1px;
}
.ro-item span{font-size:11.5px;color:var(--muted)}
.ro-item b{font-size:16px;color:var(--ink);font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:.2px}
.controls{display:flex;flex-direction:column;gap:10px}
.ctl{display:flex;flex-direction:column;gap:4px}
.ctl span{font-size:12px;color:var(--muted);display:flex;justify-content:space-between}
.ctl span b{color:var(--accent);font-weight:700}
.ctl input[type=range]{
  -webkit-appearance:none;width:100%;height:5px;border-radius:5px;background:var(--line);
  outline:none;margin:4px 0;
}
.ctl input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:#fff;
  border:3px solid var(--accent);cursor:pointer;box-shadow:0 1px 4px rgba(22,33,58,.2);
}
.switch-btn{
  display:flex;align-items:center;gap:8px;padding:9px 14px;border-radius:10px;
  border:1px solid var(--line);background:#fff;font-size:13px;font-weight:600;color:var(--muted);
}
.switch-btn .sb-dot{width:9px;height:9px;border-radius:50%;background:#cbd5e1;transition:.2s}
.switch-btn.on{background:var(--accent-soft);border-color:var(--accent-2);color:var(--accent)}
.switch-btn.on .sb-dot{background:var(--accent);box-shadow:0 0 0 4px rgba(15,157,118,.15)}

.verdict-box{
  display:flex;gap:9px;background:#f7fbf9;border:1px solid var(--accent-2);border-radius:11px;
  padding:11px 13px;font-size:12.5px;line-height:1.72;color:var(--ink-2);
}
body[data-subject="phys"] .verdict-box{background:#f7faff;border-color:var(--accent-2)}
.verdict-box .vb-icon{font-size:15px;line-height:1.4}
.warn-box{
  margin-top:8px;background:#fff7ed;border:1px solid #fed7aa;border-radius:10px;
  padding:9px 12px;font-size:12.5px;color:#b45309;font-weight:600;
}

/* ---- 生活场景 ---- */
.life-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:10px;padding:0 16px 16px}
.life-card{
  display:flex;gap:10px;align-items:flex-start;background:#fbfcfe;border:1px solid var(--line);
  border-radius:12px;padding:11px 13px;
}
.life-card .lc-icon{font-size:19px;line-height:1.2}
.life-card h4{font-size:13px;margin-bottom:2px}
.life-card p{font-size:12px;color:var(--muted);line-height:1.6}

/* ============ 化学反应实验室 ============ */
.reaction-body{display:flex;align-items:stretch}
.shelf{
  flex:0 0 38%;min-width:0;border-right:1px solid var(--line-2);padding:12px 14px;
  display:flex;flex-direction:column;gap:10px;background:#fbfcfe;
}
.shelf-group h5{
  font-size:11.5px;color:var(--muted);font-weight:700;letter-spacing:.6px;margin:0 0 6px;
}
.shelf-items{display:flex;flex-wrap:wrap;gap:6px}
.reagent{
  display:flex;align-items:center;gap:5px;padding:6px 10px;border-radius:9px;border:1px solid var(--line);
  background:#fff;font-size:12.5px;font-weight:600;color:var(--ink-2);transition:.15s;
}
.reagent:hover{border-color:var(--accent-2);background:var(--accent-soft)}
.reagent.on{background:var(--accent);border-color:var(--accent);color:#fff}
.reagent .ri{font-size:13px}
.beaker-stage{
  flex:1;min-width:0;position:relative;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(circle at 50% 35%,#fbfdff 0%,#f4f8fd 75%);
  padding:6px;
}
.beaker-svg{width:100%;max-width:380px;height:auto}
.reaction-info{
  flex:0 0 31%;min-width:0;border-left:1px solid var(--line-2);padding:14px;display:flex;flex-direction:column;gap:10px;
}
.rx-name{font-size:15px;font-weight:800}
.rx-eq{
  font-family:ui-monospace,Consolas,monospace;font-size:13px;background:#f1f5f9;border-radius:9px;
  padding:9px 11px;color:#0f172a;word-break:break-all;line-height:1.7;
}
.rx-phen{font-size:13px;line-height:1.75;color:var(--ink-2)}
.rx-phen b{color:var(--accent)}
.rx-tag{
  display:inline-block;font-size:11.5px;font-weight:700;padding:2px 9px;border-radius:20px;
  background:var(--accent-soft);color:var(--accent);margin-right:6px;
}
.rx-life{font-size:12.5px;color:var(--muted);line-height:1.7;border-left:3px solid var(--accent-2);padding-left:10px}
.rx-empty{font-size:13px;color:var(--muted);text-align:center;padding:20px 10px;line-height:1.8}
.rx-tag.gray{background:#f1f5f9;color:#64748b}
.shelf-foot{display:flex;align-items:center;gap:10px;margin-top:auto;padding-top:10px;border-top:1px dashed var(--line)}
.pick-info{font-size:12.5px;color:var(--ink-2);font-weight:600;flex:1;min-width:0}
.shelf-foot .btn-ghost{padding:6px 12px;font-size:12px}

/* 气泡 / 沉淀 / 光晕 */
@keyframes rise{0%{transform:translateY(0);opacity:.95}80%{opacity:.7}100%{transform:translateY(-72px);opacity:0}}
@keyframes settle{0%{transform:translateY(0);opacity:0}20%{opacity:1}100%{transform:translateY(46px);opacity:.85}}
@keyframes swirl{0%{transform:translateX(0)}50%{transform:translateX(6px)}100%{transform:translateX(0)}}
@keyframes flash{0%,100%{opacity:.25}50%{opacity:.8}}
.fx-bubble{animation:rise 2.6s linear infinite}
.fx-precip{animation:settle 2.2s ease-in infinite}
.heat-glow{animation:flash 1.6s ease-in-out infinite}

/* ============ 实验演示 ============ */
.exp-wrap{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;
}
.exp-count{
  font-size:11.5px;font-weight:700;color:var(--accent);background:var(--accent-2);
  padding:4px 10px;border-radius:20px;white-space:nowrap;
}
.exp-tabs{display:flex;gap:6px;padding:0 16px 12px;flex-wrap:wrap}
.exp-tabs button{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 13px 7px 8px;border-radius:9px;font-size:12.5px;font-weight:600;color:var(--muted);
  border:1px solid var(--line);background:#fff;transition:.16s;
}
.exp-tabs button i{
  width:17px;height:17px;border-radius:5px;background:var(--line-2);color:var(--muted);
  font-size:10.5px;font-style:normal;font-weight:800;
  display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;
}
.exp-tabs button:hover{border-color:var(--accent);color:var(--accent)}
.exp-tabs button.on{background:var(--accent);border-color:var(--accent);color:#fff}
.exp-tabs button.on i{background:rgba(255,255,255,.24);color:#fff}
.exp-body{display:flex;align-items:stretch;border-top:1px solid var(--line-2)}
.exp-stage{
  flex:1 1 56%;min-width:0;background:radial-gradient(circle at 50% 40%,#fbfdff,#f2f7fc);
  padding:10px;display:flex;align-items:center;justify-content:center;
}
.exp-svg{width:100%;height:auto;max-height:330px}
.exp-side{flex:1 1 44%;min-width:0;padding:14px 16px;display:flex;flex-direction:column;gap:10px}
.exp-steps{display:flex;gap:5px;flex-wrap:wrap}
.exp-step-dot{
  width:26px;height:26px;border-radius:8px;font-size:11.5px;font-weight:700;
  background:var(--line-2);color:var(--muted);display:flex;align-items:center;justify-content:center;
}
.exp-step-dot.on{background:var(--accent);color:#fff}
.exp-step-dot.done{background:var(--accent-2);color:var(--accent)}
.exp-title{font-size:15.5px;font-weight:800}
.exp-text{font-size:13px;line-height:1.8;color:var(--ink-2)}
.exp-tip{
  font-size:12.5px;line-height:1.7;background:#fff7ed;border:1px solid #fed7aa;border-radius:9px;
  padding:9px 11px;color:#b45309;
}
.exp-nav{display:flex;gap:8px;margin-top:auto}
.exp-nav button{
  flex:1;padding:9px;border-radius:10px;border:1px solid var(--line);background:#fff;
  font-size:13px;font-weight:600;color:var(--ink-2);
}
.exp-nav button:disabled{opacity:.4}
.exp-nav button.primary{background:var(--accent);border-color:var(--accent);color:#fff}

/* 高亮 */
.exp-svg .hl{opacity:.18;transition:opacity .35s}
.exp-svg .on{opacity:1;transition:opacity .35s}
.exp-svg .pulse{animation:hlPulse 1.6s ease-in-out infinite}
@keyframes hlPulse{0%,100%{filter:drop-shadow(0 0 0 rgba(15,157,118,0))}50%{filter:drop-shadow(0 0 6px rgba(15,157,118,.65))}}

/* ============ 知识串讲 ============ */
.sum-hero{
  background:linear-gradient(135deg,var(--accent-soft),#fff 65%);
  border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);
}
.sum-hero h2{font-size:19px}
.sum-hero p{font-size:13px;color:var(--ink-2);margin-top:6px;line-height:1.75;max-width:760px}
.spine{
  display:flex;align-items:stretch;gap:0;margin-top:16px;overflow-x:auto;padding-bottom:4px;
  scrollbar-width:none;
}
.spine::-webkit-scrollbar{display:none}
.spine-node{
  flex:0 0 auto;position:relative;padding:10px 16px;background:#fff;border:1px solid var(--line);
  border-radius:10px;margin-right:16px;min-width:112px;text-align:center;font-family:inherit;cursor:pointer;
  transition:.16s;
}
.spine-node:hover{border-color:var(--accent);background:var(--accent-soft)}
.ch-link{
  font-size:11px;color:var(--accent);background:var(--accent-soft);border-radius:6px;
  padding:1px 7px;margin:0 4px 4px 0;font-weight:600;font-family:inherit;cursor:pointer;
}
.ch-link:hover{background:var(--accent-2)}
.spine-node::after{
  content:"";position:absolute;right:-16px;top:50%;width:16px;height:2px;background:var(--accent-2);
}
.spine-node:last-child::after{display:none}
.spine-node b{display:block;font-size:13px;color:var(--accent)}
.spine-node span{font-size:11px;color:var(--muted)}
.sum-block{margin-top:18px}
.sum-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:10px}
.sum-card{
  background:#fff;border:1px solid var(--line);border-radius:13px;padding:14px 16px;box-shadow:0 1px 2px rgba(22,33,58,.03);
}
.sum-card h4{font-size:14.5px;display:flex;align-items:center;gap:7px}
.sum-card h4 .sc-i{font-size:15px}
.sum-card .sc-ch{font-size:11.5px;color:var(--muted);margin:3px 0 8px}
.sum-card ul{margin:0;padding-left:17px}
.sum-card li{font-size:12.5px;line-height:1.8;color:var(--ink-2);margin-bottom:2px}
.sum-card li::marker{color:var(--accent)}
.formula-row{display:flex;flex-wrap:wrap;gap:7px;margin-top:9px}
.formula{
  font-family:ui-monospace,Consolas,monospace;font-size:12px;background:var(--accent-soft);
  color:var(--accent);padding:3px 9px;border-radius:7px;font-weight:600;
}
.mistake-list{counter-reset:mk;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:9px}
.mistake{
  background:#fff;border:1px solid var(--line);border-left:3px solid #f59e0b;border-radius:10px;
  padding:10px 13px;font-size:12.5px;line-height:1.75;color:var(--ink-2);
}
.mistake b{color:#b45309}
.quick-table{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden;font-size:12.5px}
.quick-table th,.quick-table td{padding:9px 12px;border-bottom:1px solid var(--line-2);text-align:left}
.quick-table th{background:var(--accent-soft);color:var(--accent);font-size:12px;font-weight:700}
.quick-table tr:last-child td{border-bottom:none}
.quick-table td:first-child{font-weight:600;color:var(--ink);white-space:nowrap}

/* ---- 串讲扩展板块：实验专题 / 计算专题 / 答题规范 ---- */
.sc-desc{font-size:12.5px;color:var(--muted);margin:0 0 6px;line-height:1.7}
.block-lead{
  font-size:12.5px;color:var(--muted);line-height:1.75;
  margin:-4px 0 12px 33px;max-width:820px;
}
.block-lead b{color:var(--accent)}

/* 实验专题 */
.exp-sum-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:10px}
.exp-sum{
  background:#fff;border:1px solid var(--line);border-radius:13px;padding:13px 15px;
  box-shadow:0 1px 2px rgba(22,33,58,.03);border-top:3px solid var(--accent);
}
.exp-sum h4{font-size:13.5px;color:var(--accent);margin-bottom:8px}
.es-row{display:flex;gap:8px;margin-bottom:6px;font-size:12.5px;line-height:1.72;color:var(--ink-2)}
.es-row b{
  flex:0 0 auto;font-size:11px;font-weight:700;color:var(--muted);
  background:var(--line-2);border-radius:5px;padding:2px 6px;height:fit-content;margin-top:2px;
  white-space:nowrap;
}
.es-tip{
  margin-top:7px;font-size:12px;line-height:1.7;color:#b45309;
  background:#fffbeb;border-radius:8px;padding:7px 10px;
}

/* 计算专题 */
.calc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:10px}
.calc-card{
  background:#fff;border:1px solid var(--line);border-radius:13px;padding:14px 16px;
  box-shadow:0 1px 2px rgba(22,33,58,.03);
}
.calc-card h4{font-size:14px;margin-bottom:2px}
.calc-steps{margin:10px 0 0;padding-left:19px;counter-reset:none}
.calc-steps li{font-size:12.5px;line-height:1.78;color:var(--ink-2);margin-bottom:3px}
.calc-steps li::marker{color:var(--accent);font-weight:700}
.calc-eg{
  margin-top:10px;font-size:12px;line-height:1.72;color:var(--ink-2);
  background:var(--accent-soft);border-radius:9px;padding:8px 11px;
}
.calc-eg b{
  color:var(--accent);font-size:11px;margin-right:6px;
  background:#fff;border-radius:4px;padding:1px 6px;
}

/* 答题规范 */
.talk-list{display:flex;flex-direction:column;gap:9px}
.talk-row{
  display:flex;gap:14px;background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:12px 15px;box-shadow:0 1px 2px rgba(22,33,58,.03);
}
.talk-q{
  flex:0 0 132px;font-size:12.5px;font-weight:800;color:var(--accent);
  border-right:2px solid var(--accent-2);padding-right:14px;
}
.talk-a{flex:1 1 auto;font-size:12.5px;line-height:1.8;color:var(--ink-2)}
.talk-a b{color:#b45309}

/* ---- 响应式 ---- */
@media (max-width:860px){
  .lab-body,.reaction-body,.exp-body{flex-direction:column}
  .circuit-stage,.shelf,.exp-stage{border-right:none;border-bottom:1px solid var(--line-2)}
  .lab-panel,.reaction-info,.exp-side{border-left:none}
  .scene-tabs{margin-left:0;width:100%;overflow-x:auto}
  .view-bar{padding:8px 14px}
  .vb-hint{display:none}
  .view-tabs{overflow-x:auto}
  .readout{grid-template-columns:1fr 1fr}
  .reaction-info{border-top:1px solid var(--line-2)}
  .beaker-svg{max-width:260px}
  .exp-svg{max-height:260px}
  .sum-grid,.mistake-list,.exp-sum-grid,.calc-grid{grid-template-columns:1fr}
  .life-row{grid-template-columns:1fr;padding:0 14px 14px}
}
@media (max-width:520px){
  .lab-head{padding:14px}
  .lab-head h2{font-size:15.5px}
  .scene-tabs button{padding:6px 10px;font-size:12px}
  .ro-item b{font-size:15px}
  .exp-side{padding:12px 14px}
  .exp-tabs{padding:0 14px 10px;gap:5px;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}
  .exp-tabs::-webkit-scrollbar{display:none}
  .exp-tabs button{padding:6px 10px 6px 7px;font-size:11.5px;flex:0 0 auto;white-space:nowrap}
  .block-lead{margin-left:0}
  .talk-row{flex-direction:column;gap:7px}
  .talk-q{flex:none;border-right:none;border-left:3px solid var(--accent-2);padding:0 0 0 9px}
  .es-row{flex-direction:column;gap:3px}
  .es-row b{width:fit-content}
  /* 试剂架压缩成单行横滑，避免把烧杯挤到屏幕外 */
  .shelf{padding:10px 12px;gap:7px}
  .shelf-group{display:flex;align-items:center;gap:8px}
  .shelf-group h5{flex:0 0 auto;width:50px;margin:0;font-size:10.5px;letter-spacing:0;line-height:1.25}
  .shelf-items{flex-wrap:nowrap;overflow-x:auto;gap:5px;padding-bottom:2px;scrollbar-width:none}
  .shelf-items::-webkit-scrollbar{display:none}
  .reagent{flex:0 0 auto;white-space:nowrap;padding:5px 9px;font-size:11.5px}
  .reagent .ri{font-size:12px}
  .shelf-foot{padding-top:8px}
}

/* ============================================================
   实验室切换栏
   ============================================================ */
.lab-switch{
  display:flex;gap:8px;margin-bottom:14px;overflow-x:auto;padding-bottom:2px;
  scrollbar-width:none;
}
.lab-switch::-webkit-scrollbar{display:none}
.lab-switch button{
  flex:0 0 auto;display:flex;flex-direction:column;gap:1px;align-items:flex-start;
  padding:9px 16px;border-radius:12px;background:#fff;border:1px solid var(--line);
  transition:.16s;text-align:left;
}
.lab-switch button b{font-size:13.5px;font-weight:700;color:var(--ink-2)}
.lab-switch button span{font-size:10.5px;color:var(--muted)}
.lab-switch button:hover{border-color:var(--accent-2)}
.lab-switch button.on{background:var(--accent);border-color:var(--accent);box-shadow:0 4px 12px -4px rgba(15,157,118,.45)}
.lab-switch button.on b{color:#fff}
.lab-switch button.on span{color:rgba(255,255,255,.82)}

/* ============================================================
   化学 · 自由实验台
   ============================================================ */
.cl-wrap{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;
}
.cl-count{
  margin-left:auto;font-size:11.5px;font-weight:700;color:var(--accent);
  background:var(--accent-soft);padding:4px 11px;border-radius:20px;white-space:nowrap;
}
.cl-body{display:flex;align-items:stretch;border-top:1px solid var(--line-2)}

.cl-left{flex:0 0 34%;min-width:0;border-right:1px solid var(--line-2);display:flex;flex-direction:column}
.cl-cats{
  display:flex;gap:5px;flex-wrap:wrap;padding:12px 12px 8px;border-bottom:1px solid var(--line-2);
}
.cl-cat{
  display:inline-flex;align-items:center;gap:4px;padding:5px 9px;border-radius:8px;
  font-size:11.5px;font-weight:600;color:var(--muted);border:1px solid var(--line);background:#fff;
  transition:.14s;
}
.cl-cat i{
  font-style:normal;font-size:9.5px;font-weight:800;background:var(--line-2);color:var(--muted);
  border-radius:4px;padding:0 3px;min-width:13px;text-align:center;
}
.cl-cat:hover{border-color:var(--accent-2);color:var(--accent)}
.cl-cat.on{background:var(--accent);border-color:var(--accent);color:#fff}
.cl-cat.on i{background:rgba(255,255,255,.26);color:#fff}

/* 一键实验快捷条 */
.cl-presets{
  display:flex;flex-wrap:wrap;gap:6px;align-items:center;
  padding:0 12px 9px;margin-bottom:2px;border-bottom:1px dashed var(--line);
}
.cp-lb{font-size:11px;font-weight:700;color:#94a3b8;letter-spacing:.3px;margin-right:2px}
.cp-btn{
  padding:4px 9px;border-radius:999px;font-size:11.5px;font-weight:600;
  color:var(--accent);background:var(--accent-tint,#e7f7f1);
  border:1px solid rgba(15,157,118,.22);transition:.14s;white-space:nowrap;
}
.cp-btn:hover{background:var(--accent);color:#fff;border-color:var(--accent);transform:translateY(-1px)}
.cp-btn:active{transform:translateY(0)}

.cl-items{
  flex:1;min-height:0;overflow-y:auto;padding:10px 12px;display:grid;
  grid-template-columns:repeat(auto-fill,minmax(88px,1fr));gap:7px;align-content:start;
  max-height:390px;
}
.cl-item{
  position:relative;display:flex;flex-direction:column;align-items:center;gap:3px;
  padding:9px 5px;border-radius:10px;border:1px solid var(--line);background:#fff;
  transition:.14s;font-size:11px;color:var(--ink-2);line-height:1.3;text-align:center;
}
.cl-item:hover{border-color:var(--accent-2);background:var(--accent-soft)}
.cl-item .ci-e{font-size:17px;line-height:1}
.cl-item .ci-n{font-weight:600}
.cl-item.on{border-color:var(--accent);background:var(--accent-soft);box-shadow:0 0 0 2px var(--accent-2) inset}
.cl-item.on .ci-n{color:var(--accent)}
.cl-item.is-op{background:#fffbeb;border-color:#fde68a}
.cl-item.is-op:hover{background:#fef3c7}
.cl-item.is-op.on{background:#fef3c7;border-color:#f59e0b;box-shadow:0 0 0 2px #fde68a inset}
.cl-item.is-op.on .ci-n{color:#b45309}
.ci-tick{
  position:absolute;top:3px;right:4px;width:14px;height:14px;border-radius:50%;
  background:var(--accent);color:#fff;font-size:9px;display:flex;align-items:center;justify-content:center;
}

.cl-picked{
  padding:9px 12px;border-top:1px solid var(--line-2);display:flex;flex-wrap:wrap;gap:5px;
  align-items:center;background:#fbfdff;min-height:44px;
}
.cl-hint{font-size:11.5px;color:var(--muted);line-height:1.5}
.cl-chip{
  display:inline-flex;align-items:center;gap:5px;padding:3px 4px 3px 9px;border-radius:7px;
  background:var(--accent-soft);color:var(--accent);font-size:11.5px;font-weight:700;
  border:1px solid var(--accent-2);
}
.cl-chip.op{background:#fef3c7;color:#b45309;border-color:#fde68a}
.cl-chip b{
  cursor:pointer;width:15px;height:15px;border-radius:4px;display:flex;align-items:center;
  justify-content:center;font-size:12px;opacity:.55;font-weight:400;
}
.cl-chip b:hover{opacity:1;background:rgba(0,0,0,.07)}
.cl-clear{
  margin-left:auto;font-size:11px;color:var(--muted);padding:3px 8px;border-radius:6px;
  border:1px solid var(--line);
}
.cl-clear:hover{border-color:#fca5a5;color:#dc2626}

.cl-stage{
  flex:1 1 32%;min-width:0;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(circle at 50% 38%,#fbfdff,#f1f7fc);padding:10px;
}
.cl-svg{width:100%;height:auto;max-height:400px}

.cl-info{
  flex:0 0 34%;min-width:0;border-left:1px solid var(--line-2);padding:14px 16px;
  display:flex;flex-direction:column;gap:9px;max-height:520px;overflow-y:auto;
}
.cl-empty{text-align:center;padding:16px 6px}
.cl-empty .ce-i{font-size:34px;margin-bottom:6px}
.cl-empty p{font-size:12.5px;color:var(--muted);line-height:1.7}
.ce-try{margin-top:14px;text-align:left;display:flex;flex-direction:column;gap:5px}
.ce-try b{font-size:11.5px;color:var(--ink-2);margin-bottom:2px}
.ce-try span{
  font-size:11.5px;color:var(--accent);background:var(--accent-soft);border-radius:7px;
  padding:5px 9px;
}
.cl-name{font-size:15.5px;font-weight:800;line-height:1.4}
.cl-tags{display:flex;gap:6px}
.cl-tag{
  font-size:10.5px;font-weight:700;color:var(--accent);background:var(--accent-soft);
  padding:2px 9px;border-radius:20px;
}
.cl-tag.gray{color:var(--muted);background:var(--line-2)}
.cl-eq{
  font-family:ui-monospace,Consolas,monospace;font-size:12px;color:var(--accent);
  background:var(--accent-soft);border-radius:9px;padding:9px 11px;line-height:1.6;word-break:break-word;
}
.cl-phen{font-size:12.5px;line-height:1.8;color:var(--ink-2)}
.cl-phen b:first-child{
  display:block;font-size:10.5px;color:var(--muted);letter-spacing:.5px;margin-bottom:3px;font-weight:700;
}
.cl-op{
  font-size:12px;line-height:1.7;color:#b45309;background:#fffbeb;border-radius:9px;padding:8px 11px;
}
.cl-op b{display:block;font-size:10.5px;color:#d97706;margin-bottom:2px}
.cl-tip{
  font-size:12px;line-height:1.72;color:#b45309;background:#fffbeb;border-radius:9px;padding:8px 11px;
}
.cl-life{font-size:12px;line-height:1.72;color:var(--muted);border-top:1px dashed var(--line);padding-top:8px}

/* 实验台动画 */
@keyframes clBub{
  0%{transform:translateY(0);opacity:0}
  15%{opacity:.9}
  100%{transform:translateY(-150px);opacity:0}
}
.cl-bub{animation:clBub 2.2s ease-in infinite;transform-origin:center}
@keyframes clPrc{
  0%{transform:translateY(-40px);opacity:0}
  25%{opacity:.95}
  100%{transform:translateY(0);opacity:.95}
}
.cl-prc{animation:clPrc 2.4s ease-out infinite}
@keyframes clFire{
  0%,100%{transform:scaleY(1) scaleX(1);opacity:.92}
  50%{transform:scaleY(1.18) scaleX(.9);opacity:1}
}
.cl-fire{animation:clFire .55s ease-in-out infinite;transform-origin:160px 78px}
@keyframes clSmoke{
  0%{transform:translateY(0) scale(.6);opacity:0}
  30%{opacity:.75}
  100%{transform:translateY(-46px) scale(1.5);opacity:0}
}
.cl-smoke{animation:clSmoke 2.8s ease-out infinite;transform-origin:center}
@keyframes clSpark{
  0%,100%{opacity:.15}
  50%{opacity:1}
}
.cl-spark{animation:clSpark .7s ease-in-out infinite}
@keyframes clHeat{
  0%,100%{opacity:.55;transform:scale(1)}
  50%{opacity:.9;transform:scale(1.06)}
}
.cl-heat{animation:clHeat 1.6s ease-in-out infinite;transform-origin:160px 300px}
@keyframes clGlow{
  0%,100%{opacity:.5}
  50%{opacity:.95}
}
.cl-glow{animation:clGlow 1.4s ease-in-out infinite}
@keyframes clSteam{
  0%,100%{opacity:.3;transform:translateY(0)}
  50%{opacity:.9;transform:translateY(-8px)}
}
.cl-steam{animation:clSteam 2s ease-in-out infinite}

/* ============================================================
   化学 · 气体制取台
   ============================================================ */
.gl-wrap{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;
}
.gl-badge{
  margin-left:auto;font-size:11.5px;font-weight:700;padding:4px 11px;border-radius:20px;
  background:var(--line-2);color:var(--muted);white-space:nowrap;
}
.gl-badge.ok{background:#dcfce7;color:#15803d}
.gl-badge.bad{background:#fee2e2;color:#b91c1c}
.gl-body{display:flex;align-items:stretch;border-top:1px solid var(--line-2)}

.gl-pickers{
  flex:0 0 32%;min-width:0;border-right:1px solid var(--line-2);padding:12px;
  display:flex;flex-direction:column;gap:12px;overflow-y:auto;max-height:560px;
}
.gl-row h5{font-size:11.5px;color:var(--muted);margin-bottom:6px;font-weight:700;letter-spacing:.3px}
.gl-opts{display:flex;flex-direction:column;gap:5px}
.gl-opt{
  display:flex;flex-direction:column;gap:1px;align-items:flex-start;text-align:left;
  padding:7px 10px;border-radius:9px;border:1px solid var(--line);background:#fff;transition:.14s;
}
.gl-opt b{font-size:12px;font-weight:700;color:var(--ink-2)}
.gl-opt span{font-size:10.5px;color:var(--muted);line-height:1.4}
.gl-opt:hover{border-color:var(--accent-2);background:var(--accent-soft)}
.gl-opt.on{border-color:var(--accent);background:var(--accent-soft)}
.gl-opt.on b{color:var(--accent)}

.gl-stage{
  flex:1 1 34%;min-width:0;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(circle at 50% 40%,#fbfdff,#f1f7fc);padding:8px;
}
.gl-svg{width:100%;height:auto;max-height:400px}
@keyframes glFlame{
  0%,100%{transform:scaleY(1);opacity:.9}
  50%{transform:scaleY(1.2);opacity:1}
}
.gl-flame{animation:glFlame .5s ease-in-out infinite}

.gl-info{
  flex:0 0 34%;min-width:0;border-left:1px solid var(--line-2);padding:14px 16px;
  display:flex;flex-direction:column;gap:9px;max-height:560px;overflow-y:auto;
}
.gl-title{font-size:14px;font-weight:800;line-height:1.45}
.gl-title.ok{color:#15803d}
.gl-title.bad{color:#b91c1c}
.gl-why{font-size:12.5px;line-height:1.8;color:var(--ink-2)}
.gl-eq{
  font-family:ui-monospace,Consolas,monospace;font-size:12px;color:var(--accent);
  background:var(--accent-soft);border-radius:9px;padding:9px 11px;word-break:break-word;
}
.gl-tips{font-size:12px;line-height:1.75;color:var(--ink-2)}
.gl-tips>b{display:block;font-size:10.5px;color:var(--muted);margin-bottom:4px;letter-spacing:.4px}
.gl-tips ul{margin:0;padding-left:16px}
.gl-tips li{margin-bottom:3px}
.gl-tips li::marker{color:var(--accent)}

/* ============================================================
   物理 · 多工作台
   ============================================================ */
.ph-wrap{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;
}
.ph-tabs{margin-left:auto;display:flex;gap:6px;flex-wrap:wrap}
.ph-tabs button{
  display:flex;flex-direction:column;align-items:flex-start;gap:0;
  padding:6px 12px;border-radius:9px;border:1px solid var(--line);background:#fff;
  font-size:12.5px;font-weight:700;color:var(--ink-2);transition:.14s;
}
.ph-tabs button i{font-style:normal;font-size:10px;color:var(--muted);font-weight:500}
.ph-tabs button.on{background:var(--accent);border-color:var(--accent)}
.ph-tabs button.on{color:#fff}
.ph-tabs button.on i{color:rgba(255,255,255,.8)}
.ph-body{border-top:1px solid var(--line-2)}
.ph-head{padding:14px 16px 12px;border-bottom:1px solid var(--line-2)}
.ph-head h3{font-size:15px}
.ph-head p{font-size:12.5px;color:var(--muted);margin-top:3px;line-height:1.6}



.op-wrap,.th-wrap,.mg-wrap{display:flex;flex-direction:column}
.op-controls,.th-controls,.mg-controls{
  padding:12px 16px;border-bottom:1px solid var(--line-2);display:flex;gap:14px;
  flex-wrap:wrap;align-items:center;
}
.op-slider{flex:1 1 200px;min-width:150px}
.op-slider label{
  display:flex;justify-content:space-between;font-size:11.5px;color:var(--muted);
  margin-bottom:5px;font-weight:600;
}
.op-slider label b{color:var(--accent);font-size:12px}
.op-slider input[type=range]{
  width:100%;height:4px;border-radius:2px;background:var(--accent-2);outline:none;
  -webkit-appearance:none;appearance:none;
}
.op-slider input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:var(--accent);
  border:2px solid #fff;box-shadow:0 1px 4px rgba(0,0,0,.2);cursor:pointer;
}
.op-presets{display:flex;gap:5px;flex-wrap:wrap}
.op-presets button{
  padding:4px 9px;border-radius:7px;font-size:11px;font-weight:600;color:var(--muted);
  border:1px solid var(--line);background:#fff;
}
.op-presets button:hover{border-color:var(--accent);color:var(--accent)}

.op-stage,.th-stage,.mg-stage{
  background:radial-gradient(circle at 50% 40%,#fbfdff,#f1f7fc);padding:10px;
  display:flex;align-items:center;justify-content:center;
}
.op-svg,.th-svg,.mg-svg{width:100%;height:auto;max-height:330px}

.op-info,.th-info,.mg-info{padding:14px 16px;border-top:1px solid var(--line-2);display:flex;flex-direction:column;gap:9px}
.op-read{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:7px}
.or-row{
  display:flex;justify-content:space-between;align-items:center;background:#fbfdff;
  border:1px solid var(--line);border-radius:9px;padding:7px 11px;font-size:12px;
}
.or-row span{color:var(--muted)}
.or-row b{color:var(--accent);font-size:13px}
.op-res{font-size:12.5px;line-height:1.8;color:var(--ink-2);border-radius:10px;padding:10px 12px}
.op-res.real{background:#fef2f2;border:1px solid #fecaca}
.op-res.virt{background:#f5f3ff;border:1px solid #ddd6fe}
.op-res.none{background:#fffbeb;border:1px solid #fde68a}
.op-res b{color:var(--ink)}
.op-tip{font-size:12px;line-height:1.72;color:#b45309;background:#fffbeb;border-radius:9px;padding:8px 11px}

/* 热学 */
.th-sel{flex:1 1 100%;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.th-sel label{font-size:11.5px;color:var(--muted);font-weight:700;flex:0 0 auto}
.th-chips{display:flex;gap:5px;flex-wrap:wrap}
.th-chips button{
  padding:4px 10px;border-radius:7px;font-size:11.5px;font-weight:600;color:var(--muted);
  border:1px solid var(--line);background:#fff;
}
.th-chips button:hover{border-color:var(--accent-2);color:var(--accent)}
.th-chips button.on{background:var(--accent);border-color:var(--accent);color:#fff}
.th-sliders{flex:1 1 100%;display:flex;gap:14px;flex-wrap:wrap}
.th-btns{flex:1 1 100%;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.th-btns .btn-primary{padding:7px 16px;font-size:12.5px;border-radius:9px}
.th-btns .btn-ghost{padding:7px 14px;font-size:12.5px;border-radius:9px}
.th-time{font-size:12px;color:var(--muted);margin-left:auto}
.th-time b{color:var(--accent);font-size:14px}
.th-chart-wrap{padding:6px 12px 0}
.th-chart{width:100%;height:auto;max-height:280px}
.th-read{display:flex;gap:9px}
.tr-item{
  flex:1;border:1px solid var(--line);border-radius:10px;padding:8px 12px;background:#fbfdff;
  display:flex;align-items:baseline;gap:7px;
}
.tr-item span{font-size:10.5px;color:var(--muted);font-weight:700}
.tr-item b{font-size:13.5px;color:var(--ink)}
.tr-item i{font-style:normal;font-size:10.5px;color:var(--muted);margin-left:auto}
.tr-item.a{border-left:3px solid #3b82f6}
.tr-item.b{border-left:3px solid #f59e0b}
.th-concl{font-size:12.5px;line-height:1.8;color:var(--ink-2);background:var(--accent-soft);border-radius:10px;padding:10px 12px}
.th-concl b{color:var(--accent)}
.th-tip{font-size:12px;line-height:1.75;color:var(--muted)}
.th-formula{
  font-family:ui-monospace,Consolas,monospace;font-size:12px;color:var(--accent);
  background:var(--accent-soft);border-radius:8px;padding:7px 11px;align-self:flex-start;
}

/* 电磁 */
.mg-controls{align-items:flex-end}
.mg-row{display:flex;gap:7px;flex-wrap:wrap}
.mg-toggle{
  padding:6px 12px;border-radius:9px;font-size:12px;font-weight:700;color:var(--muted);
  border:1px solid var(--line);background:#fff;
}
.mg-toggle.on{background:var(--accent);border-color:var(--accent);color:#fff}
.mg-toggle:hover{border-color:var(--accent-2)}
.mg-read{display:flex;gap:14px;align-items:center}
.mr-bar{flex:1}
.mr-bar span{font-size:11px;color:var(--muted);font-weight:700;display:block;margin-bottom:5px}
.mrb{height:9px;border-radius:5px;background:var(--line-2);overflow:hidden}
.mrb i{
  display:block;height:100%;border-radius:5px;transition:width .3s ease;
  background:linear-gradient(90deg,#7dd3fc,#3b82f6,#1d4ed8);
}
.mr-num{text-align:center;flex:0 0 auto}
.mr-num b{display:block;font-size:22px;font-weight:800;color:var(--accent);line-height:1.1}
.mr-num span{font-size:10.5px;color:var(--muted)}
.mg-concl{font-size:12.5px;line-height:1.8;color:var(--ink-2);background:var(--accent-soft);border-radius:10px;padding:10px 12px}
.mg-concl b{color:var(--accent)}
.mg-tip{font-size:12px;line-height:1.75;color:#b45309;background:#fffbeb;border-radius:9px;padding:8px 11px}
.mg-adv{font-size:12px;line-height:1.72;color:var(--muted)}

/* 内燃机 */
.en-controls{
  display:flex;gap:8px;align-items:center;flex-wrap:wrap;
  padding:10px 16px;border-bottom:1px solid var(--line-2);background:#fafcff;
}
.en-controls .op-slider{flex:1 1 200px;min-width:170px;margin:0}
.en-stage{
  background:radial-gradient(circle at 50% 40%,#fbfdff,#eef4fb);padding:10px;
  display:flex;align-items:center;justify-content:center;
}
.en-svg{width:100%;height:auto;max-height:430px}
.en-info{padding:14px 16px;border-top:1px solid var(--line-2);display:flex;flex-direction:column;gap:10px}
.en-now{display:flex;gap:10px;align-items:flex-start;background:var(--accent-soft);border-radius:11px;padding:10px 13px}
.en-badge{
  flex:0 0 auto;background:var(--accent);color:#fff;font-size:12px;font-weight:800;
  padding:3px 10px;border-radius:20px;white-space:nowrap;
}
.en-now p{font-size:12.5px;line-height:1.75;color:var(--ink-2);margin:0}
.en-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(118px,1fr));gap:7px}
.en-cell{
  display:flex;flex-direction:column;gap:1px;background:#fbfdff;border:1px solid var(--line);
  border-radius:9px;padding:7px 11px;
}
.en-cell span{font-size:11px;color:var(--muted)}
.en-cell b{font-size:13px;color:var(--accent);font-weight:800}
.en-strokes{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:8px}
.en-sc{
  border:1px solid var(--line);border-radius:10px;padding:9px 12px;background:#fff;
  transition:.18s;
}
.en-sc.on{border-color:var(--accent);background:var(--accent-soft);box-shadow:0 0 0 2px var(--accent-2)}
.en-sc h4{font-size:12.5px;color:var(--ink);margin-bottom:3px}
.en-sc.on h4{color:var(--accent)}
.en-sc p{font-size:11.5px;line-height:1.7;color:var(--muted);margin:0}
.en-tip{font-size:12px;line-height:1.78;color:#b45309;background:#fffbeb;border-radius:9px;padding:9px 12px}

/* ---- 响应式 ---- */
.ph-swipe{display:none}
@media (max-width:860px){
  .cl-body,.gl-body{flex-direction:column}
  .cl-left,.gl-pickers{
    flex:none;border-right:none;border-bottom:1px solid var(--line-2);max-height:none;
  }
  .cl-items{max-height:210px;grid-template-columns:repeat(auto-fill,minmax(78px,1fr))}
  .cl-info,.gl-info{border-left:none;border-top:1px solid var(--line-2);max-height:none}
  .cl-stage,.gl-stage{order:2}
  .cl-info,.gl-info{order:3}
  .cl-svg,.gl-svg{max-height:300px}
  .ph-tabs{margin-left:0;width:100%}
  .op-svg,.th-svg,.mg-svg{max-height:260px}
}
/* 窄屏：物理三台的图改横向滑动，避免整体缩得太小看不清 */
@media (max-width:640px){
  .op-stage,.th-stage,.mg-stage{
    overflow-x:auto;overflow-y:hidden;justify-content:flex-start;
    -webkit-overflow-scrolling:touch;padding:8px 10px;
  }
  .op-svg,.th-svg,.mg-svg{min-width:660px;max-height:none;flex:0 0 auto}
  .th-chart-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .th-chart{min-width:660px;max-height:none}
  .ph-swipe{display:block;text-align:center;font-size:11px;color:#94a3b8;padding:0 0 9px}
}
@media (max-width:520px){
  .lab-switch button{padding:7px 12px}
  .lab-switch button b{font-size:12.5px}
  .cl-cats{gap:4px;padding:10px 10px 7px}
  .cl-cat{padding:4px 7px;font-size:10.5px}
  .cl-items{max-height:190px;gap:6px;padding:9px 10px}
  .cl-item{padding:7px 4px;font-size:10.5px}
  .cl-item .ci-e{font-size:15px}
  .cl-info,.gl-info{padding:12px 14px}
  .gl-pickers{padding:10px}
  .op-controls,.th-controls,.mg-controls{padding:10px 12px;gap:10px}
  .op-slider{flex:1 1 100%}
  .ph-tabs button{padding:5px 9px;font-size:11.5px}
  .ph-tabs button i{display:none}
  .th-read{flex-direction:column;gap:6px}
}

/* ---- 化学台：下一步建议 ---- */
.cl-next{padding:0 12px 11px;background:#fbfdff;border-top:1px dashed var(--line-2)}
.cl-next:empty{display:none}
.cn-title{font-size:11.5px;font-weight:700;color:var(--accent);margin:9px 0 7px;line-height:1.5}
.cn-list{display:flex;flex-wrap:wrap;gap:6px}
.cn-chip{
  display:flex;flex-direction:column;align-items:flex-start;gap:0;
  padding:5px 10px;border-radius:9px;border:1px solid var(--accent-2);
  background:var(--accent-soft);max-width:100%;transition:.15s;
}
.cn-chip:hover{border-color:var(--accent);transform:translateY(-1px)}
.cn-chip b{font-size:12px;font-weight:700;color:var(--accent);white-space:nowrap}
.cn-chip i{font-size:10px;color:var(--muted);font-style:normal;line-height:1.5}
.cn-more{font-size:10.5px;color:var(--muted);margin-top:6px}