:root{--ink:#142638;--sub:#566575;--navy:#101f30;--lime:#d0f278;--green:#2e684e;--paper:#f5f7f8;--line:#dde3e7;--white:#fff;--radius:18px;font-family:"PingFang TC","Noto Sans TC","Microsoft JhengHei",system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,a,summary,select{-webkit-tap-highlight-color:transparent}button,input,select{font:inherit}button,a,summary{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default}button:focus-visible,a:focus-visible,summary:focus-visible,select:focus-visible{outline:3px solid #68a63c;outline-offset:4px}a{color:inherit}.skip{position:fixed;top:-80px;left:18px;background:var(--lime);padding:12px;z-index:100}.skip:focus{top:12px}.sidebar{width:244px;height:100dvh;position:fixed;inset:0 auto 0 0;background:var(--navy);color:#eff4f6;padding:38px 24px 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.lesson-num{background:#dfebda;color:var(--green);border-color:#dfebda}.lesson-head{display:flex;justify-content:space-between;align-items:center;gap:12px}.lesson-overline{font-size:11px;color:var(--sub);letter-spacing:1px}h2{font-size:24px;line-height:1.5;margin:6px 0 0;font-weight:600;letter-spacing:.5px}.time-pill{font-size:12px;color:var(--sub);padding:6px 11px;background:#e9eef1;border-radius:20px;white-space:nowrap}.lesson-intro{font-size:15px;color:var(--sub);margin:12px 0 23px;max-width:800px}.interactive-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(230px,.85fr);gap:20px}.stage{border-radius:var(--radius);background:var(--navy);padding:26px 28px;color:#f0f5f8;min-height:340px;position:relative;display:flex;flex-direction:column}.stage-label{font-size:12px;color:#a9bdcd;display:flex;align-items:center;justify-content:space-between;gap:10px;letter-spacing:.5px}.stage-label .badge{color:var(--lime);font-size:11px;border:1px solid #506946;padding:4px 7px;border-radius:5px}.stage-body{flex:1;display:flex;flex-direction:column;justify-content:center}.stage-bottom{font-size:12px;color:#9eb0bf;line-height:1.7;margin-top:20px}.insight{border:1px solid var(--line);background:white;border-radius:var(--radius);padding:26px;display:flex;flex-direction:column}.insight-kicker{font-size:12px;letter-spacing:1px;color:var(--sub);margin-bottom:15px}.insight h3{font-size:25px;line-height:1.5;margin:0 0 8px;font-weight:600}.insight p{font-size:14px;color:var(--sub);margin:8px 0}.insight-divider{border-top:1px solid var(--line);margin:16px 0}.micro-label{font-size:12px;color:var(--sub);margin-bottom:8px}.key-value{display:flex;gap:9px;flex-wrap:wrap}.chip{border-radius:6px;background:#eef2f3;padding:6px 10px;font-size:12px}.fact-note{margin-top:auto!important;background:#f2f6ea;border-radius:9px;padding:12px 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#3c5265;border-radius:8px;font-family:serif;font-size:26px}.lens-button.active{background:var(--lime);color:var(--navy);border-color:var(--lime)}.lens-example{border-left:2px solid var(--lime);padding-left:17px;font-size:18px;line-height:1.9;color:#eff5f6}.coin-row{display:flex;justify-content:center;gap:20px;margin:26px 0 22px}.coin{width:72px;height:72px;border-radius:50%;border:2px solid #bed487;background:#d0f278;color:var(--navy);display:grid;place-content:center;text-align:center;box-shadow:inset 0 0 0 5px var(--navy),inset 0 0 0 6px #92a763}.coin .coin-face{font-size:21px;font-weight:500}.coin small{font-size:10px;margin-top:2px}.coin.back{background:#233c50;color:#dbe6ed;border-color:#5f7a8e;box-shadow:inset 0 0 0 5px var(--navy),inset 0 0 0 6px #526e83}.coin-total{text-align:center;font-size:16px;letter-spacing:2px;margin-bottom:8px}.coin-result{text-align:center;color:var(--lime);font-size:23px}.five-elements{display:flex;justify-content:center;gap:9px;flex-wrap:wrap;margin:27px 0}.element-button{width:51px;height:51px;border:1px solid #567086;border-radius:50%;color:#e0eaf2;background:#233c50;font-size:19px}.element-button.active{background:var(--lime);border-color:var(--lime);color:var(--navy)}.relation-row{display:flex;justify-content:center;align-items:center;gap:24px;margin:12px 0}.relation-node{width:75px;height:75px;display:grid;place-content:center;border:1px solid #496274;border-radius:12px;text-align:center;background:#23384a}.relation-node small{font-size:11px;color:#9bb2c3;margin-bottom:5px}.relation-node 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auto;max-width:360px;width:100%}.ziwei-cell{border:1px solid #3b5265;background:#203448;color:#dfe8ee;border-radius:6px;font-size:12px;padding:5px 2px;line-height:1.6}.ziwei-cell small{display:block;color:#99afc1;font-size:10px}.ziwei-cell.active{background:var(--lime);color:var(--navy);border-color:var(--lime)}.ziwei-cell.active small{color:#55673e}.wheel-center{grid-area:2/2/4/4;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#c5d4df;text-align:center;font-size:20px}.wheel-center small{font-size:10px;color:#98afc1;margin-top:8px}.pillar-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:24px 0}.pillar{background:#21364a;border:1px solid #354e62;border-radius:8px;text-align:center;overflow:hidden}.pillar label{display:block;font-size:12px;color:#a9bece;padding:11px 0;border-bottom:1px solid #354e62}.pillar button{display:block;width:100%;color:#eff5f8;border:0;background:none;font-family:serif;font-size:31px;min-height:60px;padding:8px}.pillar button.active{background:var(--lime);color:var(--navy)}.pillar .branch{color:#b1c4d2}.stem-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin:25px 0}.stem-button{background:#21364a;border:1px solid #3b5468;color:#e8f1f6;border-radius:6px;padding:14px 0;font-size:23px}.stem-button.active{background:var(--lime);border-color:var(--lime);color:var(--navy)}.sequence{font-size:22px;line-height:2;letter-spacing:5px;text-align:center;margin:10px 0;color:var(--lime)}.quiz{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:25px 28px;margin-top:22px}.quiz-top{display:flex;justify-content:space-between;align-items:center}.quiz h3{font-size:17px;font-weight:550;line-height:1.7;margin:13px 0 18px}.quiz-options{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.quiz-option{text-align:left;border:1px solid #d7dfe5;border-radius:8px;background:white;color:var(--ink);padding:13px 14px;min-height:50px;font-size:14px;display:flex;align-items:center;gap:11px}.quiz-option>span{width:23px;height:23px;flex-shrink:0;display:grid;place-content:center;border:1px solid #d0dbe3;border-radius:50%;font-size:11px;color:var(--sub)}.quiz-option:hover{border-color:#91a17f;background:#f8fbf1}.quiz-option.correct{background:#edf7df;border-color:#90b267}.quiz-option.wrong{background:#fff2ed;border-color:#d9a58c}.quiz-feedback{font-size:14px;line-height:1.8;color:var(--sub)}.quiz-feedback:not(:empty){border-top:1px solid var(--line);padding-top:15px;margin-top:18px}.quiz-feedback .correct-word{color:#347347;font-weight:600}.quiz-feedback .wrong-word{color:#9c583b;font-weight:600}.lesson-footer{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:22px 0 34px}.lesson-footer p{font-size:12px;color:var(--sub);margin:0}.primary{padding:13px 23px;border:1px solid var(--ink);border-radius:8px;background:var(--ink);color:white;font-size:14px;min-width:131px;font-weight:500}.primary:hover{background:#284052}.primary:disabled{background:#e3e8eb;color:#909fa9;border-color:#e3e8eb}.source-details{border-top:1px solid var(--line);padding:18px 0;font-size:12px;color:var(--sub)}.source-details summary{cursor:pointer;min-height:28px;padding-top:5px;list-style-position:inside}.source-body{max-width:870px;padding:6px 0 10px;font-size:13px;line-height:1.8}.source-body a{display:inline-block;color:var(--green);padding:4px 0;text-underline-offset:3px}.source-body ul{padding-left:18px}.source-body li{margin:6px 0}.site-footer{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding:22px 0 26px;font-size:10px;color:#86929c;letter-spacing:1.1px}#toast{position:fixed;bottom:24px;left:calc(50% + 122px);transform:translateX(-50%);border-radius:10px;padding:13px 22px;background:var(--ink);color:white;font-size:14px;box-shadow:0 10px 30px #0002;z-index:30;opacity:0;pointer-events:none;transition:opacity .2s}#toast.visible{opacity:1}.subtle-button{font-size:12px;background:transparent;border:0;color:#bfd0db;padding:5px;text-decoration:underline;text-underline-offset:4px}.light-select{border:1px solid var(--line);background:white;padding:9px;border-radius:6px;color:var(--ink);font-size:14px;max-width:100%}.result-big{font-size:44px;color:var(--lime);text-align:center;font-family:serif;margin:23px 0 10px}.formula{display:flex;align-items:center;justify-content:center;gap:15px;margin:25px 0;font-size:28px}.formula span{color:#b3c5d3;font-size:15px}.notice{font-size:12px;color:#9eb4c4;text-align:center;line-height:1.7}.next-module{padding:7px 0;font-size:12px;line-height:1.5}
@media(min-width:1500px){main{padding-top:44px}.stage{min-height:370px}.module-intro{margin-bottom:10px}}
@media(max-width:1180px){.sidebar{width:210px;padding:30px 17px}.workspace{margin-left:210px}.topbar{padding:0 32px}main{padding:32px 32px 0}.interactive-grid{grid-template-columns:minmax(0,1.15fr) minmax(225px,.85fr);gap:16px}.stage{padding:22px}.insight{padding:23px}.lesson-nav{gap:15px}.quiz-options{grid-template-columns:1fr}.quiz-option{min-height:48px}.brand{font-size:31px}#toast{left:calc(50% + 105px)}}
@media(max-width:850px){.sidebar{width:178px;padding:27px 14px}.workspace{margin-left:178px}.brand{font-size:27px;gap:9px}.brandmark{width:26px}.brand-sub{font-size:9px;letter-spacing:.6px}.track-button{padding:11px 10px;gap:10px}.track-en{font-size:8px}.track-symbol{font-size:23px}.nav-label{margin-top:38px;font-size:10px}.track-name{font-size:14px}.interactive-grid{grid-template-columns:1fr}.insight{min-height:200px}.stage{min-height:300px}.stage-body{min-height:190px}.fact-note{margin-top:16px!important}.topbar{height:64px;padding:0 25px}main{padding:25px 25px 0}h1{font-size:29px}.module-symbol{font-size:67px}.lesson-tab{font-size:12px;gap:6px}.lesson-nav{gap:10px}.lesson-num{width:20px;height:20px;font-size:10px}.lesson-intro{font-size:14px}.lesson-head h2{font-size:22px}#toast{left:calc(50% + 89px)}}
@media(max-width:600px){.sidebar{position:relative;width:100%;height:auto;padding:19px 20px 0;background:var(--navy)}.brand{font-size:28px;gap:10px}.brand-sub{font-size:9px;letter-spacing:1.5px;margin-top:7px}.brandmark{width:26px;gap:4px}.brandmark i{height:3px}.nav-label,.side-bottom{display:none}#trackNav{grid-template-columns:repeat(5,1fr);gap:5px;margin-top:23px}.track-button{flex-direction:column;gap:8px;min-height:76px;border-radius:9px 9px 0 0;padding:10px 1px 12px;text-align:center;justify-content:center}.track-button.active{background:var(--paper)}.track-en,.track-complete{display:none}.track-name{font-size:12px;white-space:nowrap}.track-symbol{font-size:23px;width:auto}.workspace{margin:0}.topbar{height:49px;padding:0 20px;border-bottom:0}.breadcrumb,.top-status{font-size:11px}.top-status .muted{margin-left:6px}main{padding:10px 20px 0}.module-intro{gap:12px}.module-intro p{font-size:12px;line-height:1.7;max-width:260px}h1{font-size:27px;letter-spacing:0;margin:8px 0}.eyebrow{font-size:10px;letter-spacing:1px}.module-symbol{font-size:60px;margin:0}.lesson-nav{margin:20px 0 25px;gap:12px}.lesson-tab{font-size:12px;padding:12px 0 14px;gap:6px}.lesson-num{width:19px;height:19px}.lesson-overline{font-size:10px}h2,.lesson-head h2{font-size:22px}.time-pill{font-size:11px;padding:5px 8px}.lesson-intro{font-size:13px;line-height:1.8;margin:10px 0 18px}.interactive-grid{gap:12px}.stage{padding:21px 21px 18px;min-height:300px;border-radius:14px}.stage-label{font-size:11px}.stage-bottom{font-size:11px;margin-top:17px}.insight{padding:22px;border-radius:14px}.insight-kicker{font-size:11px;margin-bottom:10px}.insight h3{font-size:23px}.insight p{font-size:13px}.insight-divider{margin:13px 0}.fact-note{font-size:12px!important}.quiz{padding:21px 20px;border-radius:14px;margin-top:17px}.quiz h3{font-size:16px}.quiz-option{font-size:13px;padding:12px}.quiz-feedback{font-size:13px}.lesson-footer{margin:18px 0 29px}.lesson-footer p{max-width:160px;font-size:11px}.primary{font-size:13px;padding:12px 17px;min-width:121px}.line-stack{max-width:280px;margin:25px auto;gap:14px}.hexagram .line-stack{margin:16px 0}.line-row{gap:10px}.line-index{font-size:11px;min-width:33px}.motion-toggle{width:31px}.line-type{min-width:18px}.coin-row{gap:17px}.coin{width:66px;height:66px}.bagua-grid{gap:7px}.bagua-tile{padding:13px 4px}.bagua-tile span:first-child{font-size:32px}.bagua-tile strong{font-size:15px}.palace-wheel{grid-template-rows:repeat(4,60px)}.ziwei-cell{font-size:11px}.site-footer{font-size:9px}.source-details{font-size:11px}.source-body{font-size:12px}#toast{left:50%;width:max-content;max-width:calc(100% - 32px);font-size:13px;bottom:20px}.pillar-grid{gap:8px}.pillar button{font-size:30px}.insight .controls{margin-top:10px}.side-bottom-mobile{display:block}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
/* Reading text stays comfortable on small screens. */
.lesson-intro,.insight p{font-size:16px}.quiz-option{font-size:15px}.stage-label,.stage-bottom,.line-index,.line-type,.control,.bagua-tile small,.micro-label,.chip{font-size:13px}.source-details summary{font-size:13px}.mobile-progress{display:none}
@media(max-width:600px){.lesson-intro,.insight p{font-size:16px}.quiz-option{font-size:15px}.insight .fact-note{font-size:13px!important}.stage-label,.stage-bottom{font-size:12px}.line-index{font-size:12px;min-width:39px}.line-row{gap:9px}.control{font-size:12px}.mobile-progress{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--sub);padding:6px 0 20px}.module-intro p{font-size:14px}.lesson-tab{font-size:13px}.quiz-feedback{font-size:14px}.source-body{font-size:14px}}