:root{--ink:#203237;--muted:#7c898b;--paper:#f5f6f1;--line:#e2e7de;--lime:#ceef79;--white:#fff;--dark:#16292e;--font:"PingFang SC","Microsoft YaHei UI","Microsoft YaHei",sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:14px;line-height:1.65}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button,a{touch-action:manipulation}button{color:inherit}a{color:inherit;text-decoration:none}button{border:0;background:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,canvas:focus-visible{outline:3px solid #6c96bc;outline-offset:4px}button:disabled{opacity:.4;cursor:not-allowed}[hidden]{display:none!important}.skip-link{position:fixed;left:12px;top:-80px;padding:12px;background:var(--lime);z-index:100}.skip-link:focus{top:12px}.site-header{height:90px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:30px;max-width:1600px;margin:auto;padding:0 48px}.brand{display:flex;gap:11px;align-items:center;font-size:23px;font-weight:800;letter-spacing:2px}.brand-symbol{background:var(--ink);color:var(--lime);width:39px;height:42px;display:grid;place-items:center;border-radius:11px;font-size:23px}.brand-sub{font-size:9px;display:block;letter-spacing:2px;font-weight:500;line-height:1}.site-header nav{display:flex;gap:38px;align-self:stretch}.nav-link{display:flex;align-items:center;position:relative;font-weight:500;font-size:14px;color:#7a8583;white-space:nowrap}.nav-link.active{color:var(--ink);font-weight:700}.nav-link.active:after{content:"";height:3px;background:var(--ink);position:absolute;left:0;right:0;bottom:0}.header-progress{border:1px solid #dbe2d5;border-radius:7px;padding:10px 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.view-arrow{opacity:1}.parts-heading{display:flex;align-items:center;justify-content:space-between}.parts-heading span{font-size:9px;color:#9aa496;margin-top:12px}.part-list{display:grid;grid-template-columns:1fr 1fr;gap:5px}.part-button{padding:6px 4px;text-align:left;font-size:10px;color:#7f8b83;display:flex;align-items:center;gap:5px;border-radius:4px}.part-button:before{content:"";width:4px;height:4px;flex-shrink:0;border-radius:50%;background:#c5cfc0}.part-button:hover{background:#f5f7ef}.part-button.active{color:#395a28;font-weight:700}.part-button.active:before{background:#83ad50}.left-note{display:flex;align-items:center;gap:10px;border-top:1px solid var(--line);margin-top:auto;padding-top:18px;color:#97a18f;font-size:9px}.left-note>span{font-size:23px}.left-note p{margin:0;line-height:1.8}.viewer-panel{position:relative;min-width:0;min-height:575px;background:radial-gradient(ellipse at 50% 45%,#2e474c 0,#1b3035 68%,#172b30 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28px}.stat-card{border:1px solid var(--line);padding:24px;background:#fff;border-radius:9px;display:flex;align-items:center;justify-content:space-between}.stat-card strong{font-size:35px;font-weight:500;line-height:1.3}.stat-card small{font-size:12px;color:#8e9c84;margin-left:7px}.stat-card p{font-size:12px;color:#8d9886;margin:5px 0 0}.stat-icon{width:45px;height:45px;display:grid;place-items:center;border-radius:50%;background:#f0f5e7;font-size:23px;color:#9eb882}.progress-layout{display:grid;grid-template-columns:1.4fr 1fr;gap:22px}.record-panel{background:#fff;border:1px solid var(--line);border-radius:10px;padding:27px}.record-panel h2{font-size:16px}.progress-row{display:flex;gap:12px;align-items:center;border-bottom:1px solid #edf0e9;padding:15px 0}.progress-row:last-child{border-bottom:0}.progress-circle{border:1px solid #d8e1ce;border-radius:50%;width:26px;height:26px;display:grid;place-items:center;color:#b7c1ad;font-size:10px;flex-shrink:0}.progress-circle.done{background:#deedc5;color:#5f7e37;border-color:#deedc5}.progress-row>div{flex:1}.progress-row h3{font-size:12px;font-weight:500;margin:0}.progress-row p{font-size:10px;color:#a2ac97;margin:3px 0 0}.progress-row .text-link{font-size:10px}.history-item{padding:17px 0;border-bottom:1px solid #edf0e9;display:flex;justify-content:space-between;align-items:center}.history-item strong{font-size:18px;font-weight:500}.history-item small{display:block;font-size:10px;color:#9ba68f}.history-item span{font-size:10px;color:#879779}.record-panel .button{margin-top:24px}.empty-state{padding:30px 0;font-size:12px;line-height:1.9;color:#9aa68f}.storage-note{font-size:11px;color:#99a48f;display:flex;align-items:center;gap:18px;margin:24px 0 40px;flex-wrap:wrap}.content-dialog{padding:39px;border:1px solid #dde5d2;border-radius:15px;max-width:min(620px,calc(100vw - 30px));max-height:86vh;width:620px;color:var(--ink);background:#fcfdf8;box-shadow:0 30px 100px #142b2944}.content-dialog::backdrop{background:#0d2627a6;backdrop-filter:blur(5px)}.content-dialog h2{font-size:25px;margin:10px 0 20px;line-height:1.6}.content-dialog p{font-size:13px;color:#7b8c72;line-height:2}.close-dialog{position:absolute;top:13px;right:16px;font-size:27px;color:#8c9a82;line-height:1;padding:4px}.dialog-meta{font-size:11px;color:#92a180;margin:5px 0 20px}.takeaway{padding:17px 19px;border-left:3px solid #abc978;background:#eef4e4;font-size:12px;line-height:1.9;color:#657e4d;margin:23px 0}.dialog-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.quiz-top{display:flex;justify-content:space-between;color:#98a786;font-size:10px;letter-spacing:1px;padding-right:13px}.quiz-track{height:4px;background:#e6eddb;border-radius:2px;margin:17px 0}.quiz-track>span{display:block;height:100%;background:#abc978;transition:width .2s}.quiz-dialog h2{font-size:20px;margin:19px 0}.quiz-options{display:flex;flex-direction:column;gap:10px}.quiz-option{display:flex;align-items:flex-start;gap:12px;text-align:left;border:1px solid #dfe7d5;border-radius:6px;padding:13px 15px;font-size:12px;background:#fff;line-height:1.9;min-height:49px}.quiz-option:hover{border-color:#a6bf81;background:#f5f8ee}.quiz-option .option-letter{font-size:11px;width:22px;flex-shrink:0;color:#91a17e}.quiz-option.selected{border-color:#9ebd6f;background:#edf4e0}.quiz-option.correct{border-color:#8db26a;background:#edf4e0}.quiz-option.incorrect{border-color:#cd9e87;background:#fbf0e8}.quiz-option:disabled{opacity:1;cursor:default}.quiz-feedback{padding:14px 17px;background:#edf3e5;border-radius:6px;font-size:12px;color:#6e8457;line-height:1.9;margin-top:16px}.quiz-feedback.wrong{background:#fbefe4;color:#a27656}.quiz-actions{display:flex;justify-content:space-between;align-items:center;margin-top:23px}.quiz-actions>span{font-size:10px;color:#9aa88d}.result-score{font-family:Georgia,serif;font-size:65px;color:#66864b;line-height:1.4;margin-top:10px}.result-score small{font-size:20px;color:#a5b594}.quiz-review{margin:16px 0;border-top:1px solid var(--line)}.quiz-review details{border-bottom:1px solid var(--line);padding:10px 0;font-size:12px;color:#7a8c6b}.quiz-review summary{cursor:pointer;font-size:11px}.quiz-review p{font-size:11px}.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(15px);opacity:0;pointer-events:none;background:#243b30;color:#f2f8e9;border:1px solid #637d58;padding:12px 21px;border-radius:7px;font-size:12px;z-index:120;transition:all .2s;max-width:90vw;text-align:center}.toast.visible{opacity:1;transform:translateX(-50%) translateY(0)}.model-error{position:absolute;inset:20% 9%;display:flex;flex-direction:column;justify-content:center;text-align:center;font-size:12px;color:#b4c5ba;line-height:1.9;pointer-events:auto}.model-error strong{font-size:18px;color:#e1efd2;margin-bottom:10px}.model-error button{color:#ceef79;margin-top:10px}.noscript{position:fixed;bottom:0;background:#fff6dd;padding:15px;width:100%;text-align:center}.empty-search{font-size:11px;color:#9eab91;grid-column:1/-1;padding:15px 0}.three-label,.model-label,.part-label{position:absolute;pointer-events:none;background:#1b3036c9;border:1px solid #aec98355;padding:3px 7px;border-radius:3px;font-size:9px;color:#dbe7c9;white-space:nowrap}.guide-tip{background:#e8efd9;border:1px solid #c9d9b1;color:#637c46;padding:11px 16px;margin-bottom:16px;border-radius:6px;font-size:12px;display:flex;align-items:center;justify-content:space-between}.guide-tip button{color:#6c854f;font-size:16px}.view-button.active .view-icon{color:#607a3f;opacity:1}
@media(min-width:1500px){.workspace{grid-template-columns:240px minmax(0,1fr) 280px}.viewer-panel{min-height:610px}.three-container{min-height:395px}.structure-panel{padding:27px 20px}.detail-panel{padding:29px}.view-button{padding:15px 10px}.part-button{padding:8px 4px}.part-description{font-size:12px}}
@media(max-width:1180px){main{padding:0 28px}.site-header{padding:0 28px}.workspace{grid-template-columns:193px minmax(0,1fr) 230px}.detail-panel{padding:23px 17px 17px}.structure-panel{padding:23px 12px 16px}.model-badge{display:none}.tool{padding:5px 6px;font-size:9px}.viewer-tools{margin:0 12px 16px}.viewer-top{padding:22px 20px 0}.model-caption{padding:0 17px 13px;font-size:7px}.bottom-strip>div>span:last-child{display:none}.path-grid{gap:10px}.lesson-card{padding:15px}.site-header nav{gap:25px}.lesson-grid{grid-template-columns:repeat(3,1fr)}footer{padding:23px 28px}.part-en{font-size:8px;letter-spacing:1px}}
@media(max-width:960px){.workspace{grid-template-columns:185px minmax(0,1fr)}.detail-panel{grid-column:1/-1;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 220px;column-gap:25px;padding:20px 25px}.detail-overline{grid-column:1/-1;margin-bottom:7px}.detail-panel #part-detail{grid-row:2/5}.detail-panel .button{margin-top:0;align-self:center}.model-disclaimer{grid-column:2}.detail-points{display:none}.part-system{margin:9px 0}.part-description{margin-bottom:9px}.detail-subtitle,.part-principle{margin:5px 0}.viewer-panel{min-height:550px}.model-caption{font-size:8px}.three-container{min-height:355px}.path-grid{grid-template-columns:repeat(2,1fr)}.header-progress{font-size:10px;gap:7px;padding:8px 10px}.intro h1{font-size:31px}.lesson-grid{grid-template-columns:repeat(2,1fr)}.progress-layout{grid-template-columns:1fr 1fr}.site-header{gap:20px}.site-header nav{gap:22px}.nav-link{font-size:12px}.brand{font-size:21px}}
@media(max-width:650px){main{padding:0 17px}.site-header{height:76px;padding:0 17px;gap:12px;flex-wrap:wrap;height:auto;min-height:95px;padding-top:13px}.brand-symbol{width:32px;height:34px;font-size:19px;border-radius:9px}.brand{font-size:20px;gap:8px}.brand-sub{font-size:7px}.header-progress{margin-left:auto}.site-header nav{order:3;width:100%;justify-content:space-between;height:39px;gap:20px}.nav-link{font-size:12px;flex:1;justify-content:center}.nav-link.active:after{left:12%;right:12%;height:2px}.intro{padding:25px 0 22px;display:block}.intro h1{font-size:29px;letter-spacing:-1px;margin:8px 0}.intro p{font-size:11px;max-width:90%}.intro .button{margin-top:18px;padding:9px 14px;font-size:11px;min-height:39px}.eyebrow{font-size:8px;letter-spacing:1px}.workspace{display:flex;flex-direction:column;border-radius:9px}.structure-panel{padding:15px 13px 12px;border-right:0}.panel-heading{display:none}.structure-panel>.search-wrap{display:none}.structure-panel>.section-label{display:none}.view-list{flex-direction:row;gap:4px}.view-button{padding:8px 5px;min-height:54px;gap:3px;flex:1;justify-content:center;white-space:nowrap}.view-button .view-icon,.view-button .view-arrow{display:none}.view-button strong{font-size:10px}.view-button small{font-size:7px}.parts-heading{display:none}.part-list{display:flex;gap:7px;flex-wrap:wrap;margin-top:9px}.part-button{font-size:9px;padding:3px 5px}.left-note{display:none}.viewer-panel{min-height:440px}.viewer-top{padding:19px 16px 0}.viewer-top h2{font-size:15px}.viewer-kicker{font-size:7px}.model-badge{display:flex;font-size:7px}.three-container{min-height:280px}.model-caption{font-size:7px;padding:0 14px 13px}.model-caption>span:last-child{font-size:7px}.viewer-tools{margin:0 12px 14px;padding:5px 4px;gap:2px}.tool{font-size:9px;padding:6px 6px;gap:3px}.tool>span{font-size:12px}.tool-divider{margin:0 2px}.animation-bar{padding:9px 13px;gap:10px}.animation-bar>span{font-size:7px}.detail-panel{display:flex;padding:20px 18px}.detail-overline{margin-bottom:9px;font-size:7px}.detail-panel h2{font-size:18px}.part-description{font-size:11px;line-height:1.9}.detail-subtitle{font-size:10px}.part-principle{font-size:10px}.part-system{font-size:8px;margin:10px 0}.part-en{font-size:8px}.detail-panel .button{margin-top:14px;font-size:11px;min-height:40px;width:100%}.model-disclaimer{font-size:8px;margin-top:10px}.path-section{margin-top:28px}.section-head h2{font-size:16px}.section-head .eyebrow{font-size:6px;letter-spacing:.9px}.text-link{font-size:9px;gap:5px}.path-grid{gap:9px}.lesson-card{min-height:160px;padding:14px}.lesson-card h3{font-size:11px}.lesson-card p{font-size:9px}.lesson-number{font-size:24px}.lesson-tag{font-size:7px}.lesson-card-bottom{font-size:8px}.bottom-strip{padding:13px 12px;margin:18px 0 27px;gap:8px}.bottom-strip>div{gap:7px}.bottom-strip strong{font-size:9px}.bottom-strip .text-link{font-size:8px}.strip-icon{font-size:15px}footer{padding:20px 17px;gap:12px;flex-wrap:wrap;font-size:8px}.footer-brand{font-size:12px}.footer-brand span{font-size:6px}footer>span:not(.version){max-width:180px}.version{font-size:7px;margin-left:0}footer .text-link{font-size:8px}.page-intro{padding:28px 0 22px}.page-intro h1{font-size:24px}.page-intro p{font-size:11px}.learn-controls{gap:12px}.learn-controls .search-wrap{width:60%}.learn-controls .button{font-size:10px;gap:5px;padding:9px 12px}.lesson-grid{gap:11px}.lesson-grid .lesson-card{min-height:205px;padding:16px}.lesson-grid .lesson-card h3{font-size:13px}.lesson-grid .lesson-card p{font-size:10px}.source-section{font-size:11px;margin-top:25px}.source-section a{font-size:10px}.progress-stats{gap:8px}.stat-card{padding:14px 10px;display:block}.stat-card strong{font-size:28px}.stat-card small{font-size:10px;margin-left:3px}.stat-card p{font-size:9px}.stat-icon{display:none}.progress-layout{display:flex;flex-direction:column;gap:14px}.record-panel{padding:20px}.storage-note{font-size:10px}.content-dialog{padding:29px 22px;max-height:89vh}.content-dialog h2{font-size:21px}.content-dialog p{font-size:12px}.dialog-actions{gap:8px}.dialog-actions .button{font-size:11px;padding:11px 13px;gap:10px}.quiz-dialog h2{font-size:17px}.quiz-option{font-size:11px;padding:11px}.quiz-feedback{font-size:11px}.quiz-actions .button{font-size:11px}.quiz-actions>span{font-size:9px}.three-label,.model-label,.part-label{font-size:8px;padding:2px 4px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}


.cycle-indicator{display:flex;align-items:center;gap:12px;background:#162b2f;padding:10px 21px;border-top:1px solid #ffffff0d;font-size:9px;color:#7f9c92}.cycle-indicator #cycle-stages{display:flex;gap:4px;flex:1}.cycle-indicator #cycle-stages span{padding:3px 9px;border-radius:3px;color:#879f96}.cycle-indicator #cycle-stages span.active{background:#ceef7924;color:#ceef79}.cycle-caption{font-size:8px}.cycle-indicator #cycle-angle{font-size:8px;color:#9cb4a5;white-space:nowrap}@media(max-width:650px){.cycle-indicator{gap:7px;padding:9px 12px}.cycle-indicator #cycle-stages span{padding:3px 5px;font-size:8px}.cycle-indicator #cycle-angle{font-size:7px}.cycle-caption{font-size:7px}}