:root{--ci-ink:#172526;--ci-muted:#60716e;--ci-paper:#f6f1e7;--ci-card:#fffdf8;--ci-line:#d9ded4;--ci-teal:#147d78;--ci-coral:#c85c4d;--ci-gold:#b8873a}
#courseImmersiveWorkspace{position:fixed;inset:0;z-index:1000;background:var(--ci-paper);color:var(--ci-ink);font-family:"Noto Sans SC","PingFang SC",sans-serif}
.ci-workspace{height:100%;display:flex;flex-direction:column;background-image:linear-gradient(rgba(20,125,120,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(20,125,120,.035) 1px,transparent 1px);background-size:32px 32px}
.ci-topline{height:62px;display:flex;align-items:center;gap:24px;padding:0 32px;border-bottom:1px solid var(--ci-line);background:rgba(255,253,248,.92);font-size:13px}.ci-topline button{border:0;background:none;color:var(--ci-teal);font-weight:700}.ci-topline span{margin-right:auto;color:var(--ci-muted)}.ci-progress{height:4px;background:#e3e7df}.ci-progress i{display:block;height:100%;background:var(--ci-teal);transition:width .3s}
.ci-main{display:grid;grid-template-columns:260px minmax(0,900px);gap:34px;width:min(1240px,calc(100% - 64px));margin:0 auto;min-height:0;flex:1}.ci-outline{padding:44px 0;overflow:auto}.ci-outline>span,.ci-eyebrow{display:block;font-size:11px;letter-spacing:.14em;color:var(--ci-teal);font-weight:800}.ci-outline button{display:flex;align-items:center;gap:11px;width:100%;padding:14px 10px;border:0;border-left:2px solid transparent;background:none;text-align:left;color:var(--ci-muted);font-size:13px}.ci-outline button i{font-style:normal;width:25px;color:#8fa09b}.ci-outline button.active{border-left-color:var(--ci-teal);color:var(--ci-ink);font-weight:800;background:rgba(20,125,120,.08)}.ci-outline button.done i{color:var(--ci-teal)}
.ci-reader{overflow:auto;padding:52px 0 100px}.ci-block{max-width:820px;margin:0 auto;padding:20px 0 50px}.ci-block h1{font:700 clamp(40px,5vw,64px)/1.12 "Songti SC","STSong",serif;letter-spacing:-.04em;margin:18px 0}.ci-block h2{font:700 clamp(28px,3vw,40px)/1.2 "Songti SC","STSong",serif;margin:16px 0}.ci-lead{font-size:18px;line-height:1.8;color:#526461;max-width:720px}.ci-stats{display:flex;gap:1px;margin:34px 0;background:var(--ci-line);border:1px solid var(--ci-line)}.ci-stats div{flex:1;padding:18px;background:var(--ci-card)}.ci-stats b{display:block;font:700 28px Georgia,serif;color:var(--ci-teal)}.ci-stats span{font-size:12px;color:var(--ci-muted)}.ci-callout{display:flex;flex-wrap:wrap;gap:10px;padding:18px 20px;margin:28px 0;background:#e6f1ec;border-left:4px solid var(--ci-teal)}.ci-callout b{width:100%;font-size:14px}.ci-callout span{font-size:13px;color:#42635c}.ci-primary{padding:13px 20px;border:0;border-radius:2px;background:var(--ci-teal);color:#fff;font-weight:800;box-shadow:0 8px 18px rgba(20,125,120,.18)}.ci-primary span{margin-left:14px}
.ci-knowledge-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;margin:30px 0;background:var(--ci-line);border:1px solid var(--ci-line)}.ci-knowledge-grid>div{padding:22px;background:var(--ci-card)}.ci-knowledge-grid .wide{grid-column:1/-1}.ci-knowledge-grid small{display:block;color:var(--ci-teal);font-size:11px;letter-spacing:.12em;margin-bottom:8px}.ci-knowledge-grid b,.ci-knowledge-grid p{font-size:16px;line-height:1.7;margin:0}.ci-evidence{padding:20px;background:#fff8ec;border:1px solid #ead6b8}.ci-evidence span{display:block;color:var(--ci-gold);font-size:11px;font-weight:800;letter-spacing:.12em}.ci-evidence b{display:block;margin:8px 0;font-size:17px}.ci-evidence p{margin:0;color:#756a5a;font-size:14px}
.ci-timeline{border-left:2px solid #b5d1c8;margin-top:30px}.ci-timeline>div{display:grid;grid-template-columns:110px 1fr;gap:20px;margin:0 0 24px;padding-left:20px;position:relative}.ci-timeline>div:before{content:"";position:absolute;left:-7px;top:5px;width:10px;height:10px;border-radius:50%;background:var(--ci-teal)}.ci-timeline time{font:700 18px Georgia,serif;color:var(--ci-teal)}.ci-timeline article{padding:18px;background:var(--ci-card);border:1px solid var(--ci-line)}.ci-timeline b{font-size:18px}.ci-timeline p{font-size:15px;line-height:1.7;color:var(--ci-muted)}.ci-timeline em{color:var(--ci-coral);font-size:13px;font-style:normal}
.ci-coral{color:var(--ci-coral)!important}.ci-confusions{display:grid;gap:14px;margin-top:30px}.ci-confusions article{padding:20px;background:#fff8f5;border:1px solid #edc9c1}.ci-confusions article>div{display:flex;align-items:center;gap:12px;font-size:18px}.ci-confusions i{font:11px Georgia,serif;color:var(--ci-coral)}.ci-confusions strong{display:inline-block;margin:14px 0 6px;padding:4px 8px;background:#f4d9d3;color:#9c4439;font-size:12px}.ci-confusions p{margin:0;color:#654d49;line-height:1.7;font-size:15px}
.ci-question{padding:20px 0;border-bottom:1px solid var(--ci-line)}.ci-question>b{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--ci-ink);color:#fff}.ci-question p{display:inline;margin-left:12px;font-size:17px}.ci-question button{margin:14px 8px 0 0;padding:9px 13px;border:1px solid var(--ci-line);background:var(--ci-card);color:var(--ci-muted)}.ci-question button.selected{border-color:var(--ci-teal);color:var(--ci-teal);background:#e6f1ec}.ci-question small{display:block;margin-top:10px;color:var(--ci-teal);line-height:1.6}.ci-result{display:flex;justify-content:space-between;gap:16px;margin-top:24px;padding:18px;background:#e6f1ec}.ci-result span{color:#42635c;font-size:13px}.ci-bottom-nav{position:sticky;bottom:0;display:flex;justify-content:space-between;gap:12px;padding:16px 0;background:linear-gradient(transparent,var(--ci-paper) 30%)}.ci-bottom-nav button{padding:11px 16px;border:1px solid var(--ci-line);background:var(--ci-card);color:var(--ci-muted)}.ci-bottom-nav .ci-mark{border-color:var(--ci-teal);color:var(--ci-teal);font-weight:800}
.ci-memory-anchor{margin:30px 0;padding:22px 24px;background:#e6f1ec;border-left:4px solid var(--ci-teal)}.ci-memory-anchor span{display:block;margin-bottom:8px;color:var(--ci-teal);font-size:11px;font-weight:800;letter-spacing:.12em}.ci-memory-anchor b{font:700 18px/1.7 "Songti SC","STSong",serif}.ci-teaching-list{display:grid;gap:12px}.ci-teaching-list article{display:grid;grid-template-columns:110px 1fr;gap:20px;padding:20px;background:var(--ci-card);border:1px solid var(--ci-line)}.ci-teaching-list time{font:700 15px Georgia,serif;color:var(--ci-teal)}.ci-teaching-list h3{margin:0 0 8px;font:700 20px/1.3 "Songti SC","STSong",serif}.ci-teaching-list p{margin:0;color:var(--ci-muted);font-size:15px;line-height:1.75}.ci-teaching-list em{display:block;margin-top:10px;color:var(--ci-coral);font-size:13px;font-style:normal;line-height:1.6}.ci-question.is-right{border-left:3px solid var(--ci-teal);padding-left:16px}.ci-question.is-wrong{border-left:3px solid var(--ci-coral);padding-left:16px}.ci-question.is-wrong small{color:var(--ci-coral)}.ci-question small strong{font-weight:900}
.course-immersive-home{min-height:calc(100vh - 70px);padding:64px max(32px,5vw);background:var(--ci-paper);color:var(--ci-ink);background-image:linear-gradient(rgba(20,125,120,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(20,125,120,.035) 1px,transparent 1px);background-size:32px 32px}.ci-home-hero{display:flex;justify-content:space-between;align-items:end;gap:30px;max-width:1200px;margin:0 auto 52px}.ci-home-hero h1{font:700 clamp(40px,5vw,66px)/1.1 "Songti SC","STSong",serif;max-width:720px;margin:18px 0}.ci-home-hero h1 em{color:var(--ci-teal);font-style:normal}.ci-home-hero p{max-width:620px;color:var(--ci-muted);font-size:17px;line-height:1.8}.ci-home-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:28px;max-width:1200px;margin:0 auto}.ci-path-card,.ci-preview-card{background:rgba(255,253,248,.9);border:1px solid var(--ci-line);box-shadow:0 12px 30px rgba(23,37,38,.06)}.ci-section-head{display:flex;justify-content:space-between;padding:18px 22px;border-bottom:1px solid var(--ci-line);font-size:12px;color:var(--ci-teal);letter-spacing:.1em}.ci-section-head b{color:var(--ci-muted);letter-spacing:0}.ci-path-item{display:grid;grid-template-columns:40px 1fr auto 20px;align-items:center;gap:14px;width:100%;padding:20px 22px;border:0;border-bottom:1px solid var(--ci-line);background:none;text-align:left;color:var(--ci-ink)}.ci-path-item:hover{background:#edf5f1}.ci-path-item i{font:14px Georgia,serif;color:var(--ci-teal)}.ci-path-item span{display:grid;gap:4px}.ci-path-item b{font-size:16px}.ci-path-item small{color:var(--ci-muted);line-height:1.5}.ci-path-item em{font-size:12px;color:var(--ci-muted);font-style:normal}.ci-path-item strong{color:var(--ci-teal)}.ci-preview-card{padding:24px;align-self:start}.ci-preview-card h2{font:700 28px/1.3 "Songti SC","STSong",serif;margin:18px 0 10px}.ci-preview-card p{color:var(--ci-muted);font-size:14px;line-height:1.7}.ci-preview-rule{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:24px;padding-top:18px;border-top:1px solid var(--ci-line);font-size:12px;color:var(--ci-teal)}.ci-preview-rule b{width:100%;color:var(--ci-ink)}.ci-preview-rule i{color:#9aa9a4}
@media(max-width:800px){.ci-main{display:block;width:calc(100% - 32px)}.ci-outline{display:flex;gap:6px;padding:14px 0;overflow:auto}.ci-outline>span{display:none}.ci-outline button{min-width:150px;padding:10px;border:1px solid var(--ci-line);background:var(--ci-card)}.ci-outline button.active{border:1px solid var(--ci-teal)}.ci-reader{padding-top:14px}.ci-block{padding-bottom:35px}.ci-block h1{font-size:40px}.ci-lead{font-size:16px}.ci-stats{overflow:auto}.ci-stats div{min-width:105px}.ci-home-hero,.ci-home-grid{display:block}.ci-home-hero{margin-bottom:30px}.ci-home-hero h1{font-size:44px}.ci-home-hero .ci-primary{margin-top:20px}.ci-preview-card{margin-top:20px}.ci-path-item{grid-template-columns:30px 1fr 20px}.ci-path-item em{display:none}.ci-knowledge-grid{grid-template-columns:1fr}.ci-knowledge-grid .wide{grid-column:auto}.ci-timeline>div{grid-template-columns:72px 1fr;gap:10px}.ci-topline{padding:0 16px;gap:10px}.ci-topline span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.ci-bottom-nav{padding-bottom:25px}}

/* 真实课程入口：首屏背景承载四科路径，课程内常驻科目与章节切换。 */
body[data-view="learn"] .vision-hero{min-height:650px;grid-template-columns:minmax(520px,1fr) minmax(0,.72fr)}
body[data-view="learn"] .vision-hero-copy{max-width:830px;padding-top:58px;padding-bottom:54px}
.vision-hero-path{display:grid;grid-template-columns:repeat(4,minmax(112px,1fr));gap:8px;margin-top:28px;padding:10px;background:rgba(239,247,252,.86);border:1px solid rgba(23,105,194,.13);border-radius:14px;backdrop-filter:blur(10px)}
.vision-hero-path>div{position:relative;display:flex;align-items:center;gap:9px;min-height:62px;padding:9px 8px}
.vision-hero-path>div:not(:last-child){border-right:1px solid rgba(23,105,194,.12)}
.vision-hero-path i{display:grid;place-items:center;flex:0 0 27px;width:27px;height:27px;border-radius:50%;background:#1769c2;color:#fff;font:700 10px Georgia,serif}
.vision-hero-path span{display:grid;gap:2px}.vision-hero-path b{color:#123f64;font-size:12px}.vision-hero-path small{color:#718ca0;font-size:10px;line-height:1.3}
.vision-hero-path em{position:absolute;right:-7px;z-index:1;color:#4b97c8;font-style:normal}
body[data-view="learn"] .vision-actions{margin-top:22px}
body[data-view="learn"] .vision-actions .vision-primary{min-width:185px}
.course-subject-switcher{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:0 0 12px}
.course-subject-switcher button{min-height:68px;display:grid;grid-template-columns:30px auto 1fr auto;align-items:center;gap:8px;padding:10px 12px;text-align:left;color:#74879c;background:rgba(8,17,28,.72);border:1px solid rgba(151,190,255,.13);border-radius:12px;backdrop-filter:blur(18px)}
.course-subject-switcher button:hover{color:#dbe8f8;border-color:rgba(100,166,255,.42)}
.course-subject-switcher button.on{color:#fff;background:linear-gradient(120deg,rgba(47,124,255,.28),rgba(47,124,255,.1));border-color:#4c95ff;box-shadow:inset 0 0 0 1px rgba(111,174,255,.12)}
.course-subject-switcher i{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:rgba(255,255,255,.06);color:#6ea8ff;font:700 10px Georgia,serif}
.course-subject-switcher span{font-size:10px;color:#6ea8ff}.course-subject-switcher b{font-size:12px}.course-subject-switcher em{font-size:9px;font-style:normal;color:#61758c}
.course-subject-switcher button.on i{background:#2f7cff;color:#fff}.course-subject-switcher button.on em{color:#9dbbe0}
@media(max-width:980px){body[data-view="learn"] .vision-hero{grid-template-columns:1fr;min-height:720px}.vision-hero-path{grid-template-columns:repeat(2,1fr)}.vision-hero-path>div:nth-child(2){border-right:0}.course-subject-switcher{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){body[data-view="learn"] .vision-hero{min-height:770px}.vision-hero-path{grid-template-columns:1fr}.vision-hero-path>div{min-height:48px}.vision-hero-path>div:not(:last-child){border-right:0;border-bottom:1px solid rgba(23,105,194,.12)}.vision-hero-path em{display:none}.course-subject-switcher{display:flex;overflow-x:auto}.course-subject-switcher button{min-width:210px}.course-subject-switcher b{font-size:11px}}

/* 平板窄屏此前落在桌面侧栏与手机侧栏之间，导致内容被 228px 导航挤出画布。 */
@media(max-width:900px){
  html .sidebar,
  html .sidebar:not(.expanded){
    width:min(86vw,300px)!important;
    transform:translateX(-105%)!important;
    transition:transform .24s ease!important;
  }
  html .sidebar.mobile-open,
  html .sidebar:not(.expanded).mobile-open{transform:translateX(0)!important}
  .sidebar .sb-brand-name,
  .sidebar .sb-progress,
  .sidebar .sb-nav-group,
  .sidebar .sb-nav-name,
  .sidebar .sb-nav-status,
  .sidebar .sb-footer-contact{display:initial!important}
  .sidebar .sb-nav-item{justify-content:flex-start!important;padding-inline:12px!important}
  .sidebar~.workspace-bar{left:0!important;padding-left:72px!important}
  .sidebar~main,
  .sidebar~main.map-full{margin-left:0!important}
  .mobile-menu-btn{display:block!important}
}

.course-stage:has(.course-reading-stage){background:var(--ci-paper)!important;border-color:#d8dfd7!important}
.course-stage:has(.course-reading-stage)::before{display:none!important}
.course-reading-stage{min-height:720px;color:var(--ci-ink);background:var(--ci-paper)}
.course-subject-intro{min-height:680px;padding:70px 64px!important;color:var(--ci-ink);background:linear-gradient(135deg,rgba(255,253,248,.98),rgba(238,246,240,.94))}
.course-subject-intro h1{max-width:720px;margin:16px 0!important;color:var(--ci-ink)!important;font-size:clamp(42px,5vw,68px)!important;letter-spacing:-.05em}.course-subject-intro>p{max-width:720px!important;color:var(--ci-muted)!important;font-size:17px!important;line-height:1.8!important}
.subject-intro-stats{display:flex;gap:1px;max-width:620px;margin:38px 0;background:var(--ci-line);border:1px solid var(--ci-line)}.subject-intro-stats div{flex:1;padding:20px;background:var(--ci-card)}.subject-intro-stats b{display:block;color:var(--ci-teal);font:700 28px Georgia,serif}.subject-intro-stats span{color:var(--ci-muted);font-size:12px}
.subject-intro-action{display:flex;align-items:center;gap:16px;max-width:620px;padding:20px 22px;background:#e4f0ea;border-left:4px solid var(--ci-teal)}.subject-intro-action>i{color:var(--ci-teal);font-size:30px;font-style:normal}.subject-intro-action div{display:grid;gap:4px}.subject-intro-action b{font-size:17px}.subject-intro-action span{color:var(--ci-muted);font-size:13px}
.course-reading-context{display:flex;align-items:center;gap:12px;min-height:62px;padding:12px 24px;border-bottom:1px solid var(--ci-line);background:rgba(255,253,248,.94)}
.course-reading-context span{color:var(--ci-teal);font-size:11px;font-weight:800}.course-reading-context b{font:700 18px "Songti SC","STSong",serif}.course-reading-context em{margin-left:auto;color:var(--ci-muted);font-size:11px;font-style:normal}
.ci-embedded>.ci-progress{height:4px}.ci-embedded .ci-main{grid-template-columns:190px minmax(0,1fr);width:100%;max-width:none;margin:0;gap:0;min-height:650px}
.ci-embedded .ci-outline{padding:30px 12px;border-right:1px solid var(--ci-line);background:#eef3ed}
.ci-embedded .ci-reader{height:calc(100vh - 245px);min-height:610px;padding:42px 38px 100px}
.ci-embedded .ci-block{max-width:790px}.ci-embedded .ci-block h1{font-size:clamp(38px,4vw,56px)}.ci-embedded .ci-block h2{font-size:clamp(28px,3vw,38px)}.ci-embedded .ci-bottom-nav{background:linear-gradient(transparent,var(--ci-paper) 28%)}
@media(max-width:700px){.course-reading-context{align-items:flex-start;flex-direction:column;gap:3px}.course-reading-context em{margin-left:0}.ci-embedded .ci-main{display:block}.ci-embedded .ci-outline{display:flex;overflow-x:auto;padding:10px;border-right:0;border-bottom:1px solid var(--ci-line)}.ci-embedded .ci-outline>span{display:none}.ci-embedded .ci-outline button{min-width:150px;border:1px solid var(--ci-line);background:var(--ci-card)}.ci-embedded .ci-reader{height:auto;min-height:600px;padding:30px 18px 90px}}