/* Inner-page styling only: this stylesheet never loads on the 3D homepage. */
.topbar{height:76px;background:#040c18;border-color:#a2b9d729;color:#e9edf2}.topbar .wrap{width:calc(100% - 112px);max-width:1440px;display:grid;grid-template-columns:auto 1fr auto;gap:32px}.brand{gap:11px}.brand img{width:27px;height:27px}.brand strong{font:19px/1.2 "PingFang SC","Microsoft YaHei",sans-serif;letter-spacing:.08em;font-weight:400}.brand small{font-size:10px;color:#c4b390;letter-spacing:.15em;margin-top:6px}.nav{justify-content:center;gap:clamp(17px,2.8vw,40px);font-size:15px;color:#b8bfce;height:100%}.nav a{height:100%;display:flex;align-items:center}.nav a:hover{color:#dfbd85}.nav-actions{display:flex;gap:20px;align-items:center}.nav-catalog{border:1px solid #796a5160;border-radius:5px;padding:9px 15px;font-size:13px;color:#dfbd85;display:flex;gap:18px;white-space:nowrap}.nav-catalog[aria-current=page]{background:#dfbd8512}.nav-search{display:grid;place-items:center;width:36px;height:42px}.nav-search svg{width:24px;height:24px}.nav-actions a:hover{color:#f1dbb1}
.page-intro{padding-top:45px}.page-intro .eyebrow{font-size:11px;letter-spacing:.12em}.page-intro h1{font-weight:500}.catalog-page .page-intro{padding-bottom:36px}.catalog-sidebar{position:sticky;top:28px;align-self:start}.category-list button[aria-pressed=true]:hover{background:var(--ink);color:#fff}.search-examples{display:flex;gap:12px;flex-wrap:wrap;align-items:center;font-size:12px;margin-top:13px;color:var(--muted)}.search-examples>span{color:#7e8983;margin-right:2px}.search-examples button{padding:3px 7px;min-height:32px;border:0;background:transparent;color:#52695e;border-bottom:1px solid #bfc7bb;border-radius:0}.search-examples button:hover{background:#e8ebe2;color:#233f34}.filter-row{margin-top:22px}.reset:disabled{opacity:.45;cursor:default;text-decoration:none}.active-filters{display:flex;gap:8px;flex-wrap:wrap;margin-top:19px}.active-filters[hidden]{display:none}.active-filters button{font-size:11px;display:flex;align-items:center;gap:13px;border:1px solid #c8ccb9;color:#51624d;background:#e9ece1;padding:4px 11px;border-radius:4px;min-height:33px}.active-filters button span{font-size:16px}.active-filters button:hover{background:#dce3d2}.result-head{gap:16px;align-items:center;padding-top:21px}.result-options{display:flex;gap:17px;align-items:center;flex-shrink:0}.result-options>span{font-size:11px}.view-switch{display:flex;padding:3px;border:1px solid #cdd2c8;background:#eeefe7;border-radius:5px;gap:2px}.view-switch button{border:0;background:transparent;font-size:11px;padding:5px 10px;min-height:29px;color:var(--muted);border-radius:3px}.view-switch button[aria-pressed=true]{background:var(--ink);color:#f6f3eb}.view-switch button:hover{background:#d9e0d3}.view-switch button[aria-pressed=true]:hover{background:#28463e}
.course-card{border-radius:8px}.course-main{display:flex;flex:1;flex-direction:column}.course-card .course-content{padding:24px;flex:1}.course-card .card-action{gap:14px;margin-top:auto;padding-top:18px}.course-card h3{font-weight:500;font-size:24px;margin:14px 0 13px}.course-card .tags{margin:18px 0 22px}.course-card p{margin-bottom:22px;line-height:1.85}.course-card.without-image .course-content{min-height:205px}.course-card.without-image .meta{padding-bottom:7px}.course-main:focus-visible{outline-offset:-4px}.teacher-entry{border-top:1px solid var(--line);padding:12px 24px;font-size:12px;color:var(--gold-dark);display:flex;align-items:center;justify-content:space-between;background:#f0f0e8}.teacher-entry:hover{background:#e3e8dc}.catalog-grid[data-view=list]{grid-template-columns:1fr;gap:13px}.catalog-grid[data-view=list] .course-card{transform:none}.catalog-grid[data-view=list] .course-main{display:grid;grid-template-columns:180px 1fr;align-items:center}.catalog-grid[data-view=list] .course-main>img{margin-left:18px;width:162px;border:1px solid var(--line);border-radius:4px}.catalog-grid[data-view=list] .without-image .course-main{grid-template-columns:1fr}.catalog-grid[data-view=list] .course-content{padding:18px 23px;min-height:0}.catalog-grid[data-view=list] h3{font-size:22px;margin:6px 0 7px}.catalog-grid[data-view=list] .tags{margin:6px 0 9px}.catalog-grid[data-view=list] .course-card p{display:none}.catalog-grid[data-view=list] .card-action{border:0;padding-top:9px;font-size:11px}.catalog-grid[data-view=list] .meta{font-size:10px;padding:0}.empty-count{display:block;font:60px/1.2 var(--serif);color:#a5b3a0;margin-bottom:13px}.empty h3{font-weight:500}
.footer{background:#07131f;color:#dce6ee;border-color:#223340;padding:38px 0}.footer strong{font-size:21px;font-weight:400}.footer p{color:#94a8b8}.footer nav{display:flex;gap:25px;align-items:center}.footer nav a{color:#c6b38e;font-size:13px}.footer nav a:hover{color:#ecdbba}.detail-head h1{font-weight:500}.detail-head .text-link{font-size:12px;color:var(--muted);white-space:nowrap}.lesson-access{display:flex;align-items:center;justify-content:space-between;gap:25px;margin-top:27px;padding:22px 0 0;border-top:1px solid var(--line)}.teacher-identity{display:grid;gap:2px;margin:0;font:18px/1.8 "Kaiti SC","STKaiti","KaiTi",var(--serif)}.teacher-identity>div{display:grid;grid-template-columns:42px 1fr;gap:14px}.teacher-identity dt{color:#727d70}.teacher-identity dd{margin:0;color:#31463d}.lesson-actions{display:flex;gap:10px}.lesson-actions .btn{font-size:13px;min-height:44px;padding:9px 18px}.detail-page .page-intro{padding-bottom:27px}
.lesson-viewer{scroll-margin-top:24px}.preview-frame{padding:8px;border-radius:8px}.preview-open{position:relative;display:block;padding:0;border:0;width:100%;background:#2f493e;border-radius:5px;overflow:hidden}.preview-open img{border-radius:0}.preview-open>span{position:absolute;right:12px;bottom:12px;display:block;border:1px solid #eef1e44d;background:#071722de;color:#efefdf;border-radius:4px;font-size:11px;padding:6px 10px;opacity:.9}.preview-open:hover>span{background:#18372b;opacity:1}.preview-caption{padding:12px 7px 5px;line-height:1.6}.preview-caption>span:first-child{font-size:12px;color:#354d42}.preview-caption>span:last-child{white-space:nowrap;font-size:10px;font-variant-numeric:tabular-nums}.slide-controls{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:15px 0}.slide-controls>button{min-height:39px;white-space:nowrap;background:transparent;border:1px solid #cdd2c5;border-radius:5px;padding:6px 12px;font-size:12px;color:#314b3d}.slide-controls>button:hover:enabled{background:#e3e9da}.slide-picker{font-size:11px;color:#6a776a;display:flex;align-items:center;gap:9px;min-width:0}.slide-picker select{width:215px;max-width:100%;min-width:0;font-size:12px;border:1px solid #cdd2c5;background:#fbfaf6;border-radius:5px;min-height:39px;padding:6px 10px;color:var(--ink)}.slide-directory{border:1px solid #d1d6ca;border-radius:5px;padding:0;margin:0;background:#eeefe6}.slide-directory summary{padding:12px 16px;display:flex;justify-content:space-between;align-items:center;gap:15px;color:#53654e;list-style:none;font-size:12px}.slide-directory summary::-webkit-details-marker{display:none}.slide-directory summary>span{font-size:10px;color:#819077}.slide-directory[open] summary>span{visibility:hidden}.slide-toc{display:grid;grid-template-columns:1fr 1fr;padding:0 14px 15px;gap:4px 14px}.slide-toc button{display:flex;align-items:center;gap:10px;text-align:left;font-size:11px;line-height:1.7;border:0;background:transparent;border-radius:3px;color:#41563b;min-height:38px;padding:7px}.slide-toc button:hover{background:#dce3d2}.slide-toc button[aria-pressed=true]{background:#233b32;color:#f5f5df}.slide-toc button>span{font:12px Georgia,serif;opacity:.7}.slide-toc small{margin-left:auto;font-size:9px;opacity:.6;font-variant-numeric:tabular-nums}.preview-help{font-size:10px;color:#788372;margin:10px 0 24px}.detail-nav{gap:28px;border-top:1px solid var(--line);padding:17px 0}.timeline a{color:#77653c;text-decoration:underline;text-underline-offset:4px}.timeline a:hover{color:#254d36}
.materials-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}.materials-heading h3{font-size:14px;font-weight:500}.materials-heading small{font-size:10px;color:var(--muted)}.package-download{display:flex;align-items:center;justify-content:space-between;gap:15px;background:#e9eadf;border:1px solid #d5d9c5;border-radius:5px;padding:14px;font-size:14px;color:#334735}.package-download small{font-size:10px;display:block;margin-top:4px;color:#6a7860;line-height:1.8}.package-download>span:last-child{font-size:22px;color:#806b41}.package-download:hover{background:#dfe4d2}.package-size{font-size:10px;color:#889079;margin:5px 0 8px;text-align:right}.resource-panel .help{font-size:11px}.resource-panel{border-radius:8px}.teacher-block p{font-family:"Kaiti SC","STKaiti","KaiTi",var(--serif)}
.preview-is-open{overflow:hidden}.slide-dialog{border:1px solid #70869b47;border-radius:9px;padding:0;background:#081522;color:#dce6ef;width:min(1220px,calc(100vw - 40px));max-width:calc(100vw - 24px);max-height:calc(100dvh - 24px);overflow:auto;margin:auto;box-shadow:0 15px 70px #0008}.slide-dialog::backdrop{background:#020811e8;backdrop-filter:blur(8px)}.slide-dialog-inner{padding:18px 24px 12px}.dialog-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:16px}.dialog-toolbar h2{font:15px var(--sans);letter-spacing:.04em}.dialog-toolbar button{border:1px solid #8297aa60;border-radius:4px;background:transparent;color:#c8d9e7;padding:7px 14px;font-size:12px;min-height:38px}.dialog-toolbar button:hover{background:#253b4b}.slide-dialog img{width:100%;height:auto;max-height:calc(100dvh - 190px);object-fit:contain;background:#030a11;aspect-ratio:16/9}.dialog-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-top:15px}.dialog-bottom button{border:1px solid #76899870;border-radius:4px;background:#14293b;color:#dfc69b;font-size:12px;padding:8px 18px;min-height:39px}.dialog-bottom button:hover:enabled{background:#243e50}.dialog-bottom span{font-size:12px;text-align:center;color:#b9c9d6}.slide-dialog-inner>p{text-align:center;font-size:10px;color:#8399aa;margin-top:10px}
@media(max-width:1100px){.topbar .wrap{width:calc(100% - 52px);gap:22px}.nav{gap:21px;font-size:13px}.nav-catalog{padding:8px 11px;gap:10px}.nav-actions{gap:11px}.brand strong{font-size:17px}.brand img{width:25px;height:25px}.slide-picker select{width:170px}.lesson-access{gap:20px}.lesson-actions .btn{padding:9px 14px;font-size:12px}.result-options>span{display:none}}
@media(max-width:900px){.topbar{height:auto;min-height:108px}.topbar .wrap{grid-template-columns:1fr auto;gap:0;padding-top:9px}.nav{grid-column:1/-1;grid-row:2;justify-content:space-between;height:48px;gap:10px;font-size:14px}.brand{grid-column:1;grid-row:1;align-self:center}.brand>span{display:flex;align-items:center;gap:12px}.brand small{font-size:9px;margin:0}.nav-actions{grid-column:2;grid-row:1}.lesson-access{align-items:flex-start}.teacher-identity{font-size:16px}.teacher-identity>div{gap:8px;grid-template-columns:33px 1fr}.lesson-actions{flex-wrap:wrap;justify-content:flex-end}.slide-controls{gap:7px}.slide-picker{font-size:0;gap:0}.slide-picker select{width:150px;font-size:11px}.slide-controls>button{font-size:11px;padding:6px 8px}.slide-toc{grid-template-columns:1fr}.preview-caption>span:last-child{display:none}}
@media(max-width:760px){.topbar .wrap{width:calc(100% - 40px)}.nav-actions{gap:10px}.nav-catalog{font-size:12px;padding:7px 10px}.nav-search{width:30px}.nav-search svg{width:21px}.brand strong{font-size:17px}.brand img{width:24px;height:24px}.nav a{padding:8px 0}.catalog-sidebar{position:static}.catalog-page .page-intro{padding:30px 0 24px}.page-intro .eyebrow{font-size:10px}.page-intro h1{font-size:31px}.category-list button{font-size:12px;min-height:40px}.category-list{gap:7px}.search-examples{font-size:11px;gap:9px}.search-examples button{font-size:11px}.filter-row{margin-top:18px;gap:10px}.active-filters{margin-top:13px;gap:6px}.result-head{align-items:flex-start;gap:9px}.result-head>p{max-width:65%;line-height:1.8}.view-switch button{font-size:10px;padding:5px 8px}.course-card.without-image .course-content{min-height:180px}.course-card .course-content{padding:21px}.course-card h3{font-size:24px}.course-card .card-action{margin-top:auto}.course-card p{font-size:14px}.catalog-grid[data-view=list] .course-main{grid-template-columns:105px 1fr}.catalog-grid[data-view=list] .course-main>img{width:93px;margin-left:12px}.catalog-grid[data-view=list] .course-content{padding:15px}.catalog-grid[data-view=list] h3{font-size:20px}.catalog-grid[data-view=list] .tags{display:none}.catalog-grid[data-view=list] .meta{font-size:9px;line-height:1.8;gap:4px}.catalog-grid[data-view=list] .card-action{font-size:10px;flex-wrap:wrap;gap:6px}.teacher-entry{padding:12px 20px}.lesson-access{display:block;margin-top:22px;padding-top:17px}.teacher-identity{font-size:17px}.teacher-identity>div{grid-template-columns:35px 1fr;gap:12px}.lesson-actions{justify-content:flex-start;margin-top:16px;gap:10px}.lesson-actions .btn{font-size:13px;padding:9px 16px}.detail-head>.text-link{display:inline-flex;justify-self:start;font-size:11px}.detail-page .page-intro{padding-bottom:25px}.preview-caption{padding:10px 5px 4px}.preview-caption>span:first-child{font-size:11px}.preview-caption>span:last-child{display:initial;font-size:9px}.preview-open>span{font-size:9px;padding:5px 8px;bottom:8px;right:8px}.slide-controls{gap:9px;padding:12px 0}.slide-controls>button{font-size:11px;min-height:40px;padding:6px 10px}.slide-picker select{font-size:11px;width:170px;min-height:40px}.slide-directory summary{font-size:12px;padding:12px 14px}.slide-toc{grid-template-columns:1fr 1fr;gap:4px 6px;padding:0 8px 10px}.slide-toc button{font-size:10px;gap:7px;padding:7px 5px}.slide-toc small{display:none}.preview-help{font-size:10px;line-height:1.8;margin-bottom:20px}.detail-nav{gap:0;justify-content:space-between;font-size:12px}.footer{padding:32px 0}.footer nav{gap:24px;margin-top:22px}.footer nav a{margin-top:0;font-size:12px}.footer .wrap{display:block}.slide-dialog{width:calc(100vw - 16px);max-width:calc(100vw - 16px);max-height:calc(100dvh - 16px);border-radius:6px}.slide-dialog-inner{padding:12px 12px 9px}.dialog-toolbar{margin-bottom:12px}.dialog-toolbar h2{font-size:12px}.dialog-toolbar button{font-size:11px;padding:5px 9px}.dialog-bottom{gap:10px;padding-top:12px;flex-wrap:wrap}.dialog-bottom button{font-size:11px;padding:6px 11px;min-height:39px}.dialog-bottom span{font-size:10px;max-width:46%}.slide-dialog-inner>p{font-size:9px}.slide-dialog img{max-height:calc(100dvh - 170px)}}
@media(max-width:420px){.brand small{display:none}.nav{font-size:12px}.nav-actions{gap:6px}.slide-controls>button{padding:6px 8px;font-size:10px}.slide-picker select{width:145px;font-size:10px}.preview-caption>span:last-child{display:none}.slide-toc{grid-template-columns:1fr}.slide-toc button{font-size:12px}.slide-toc small{display:inline}.catalog-grid[data-view=list] .course-main{grid-template-columns:1fr}.catalog-grid[data-view=list] .course-main>img{display:none}.catalog-grid[data-view=list] .card-action{justify-content:space-between}}
@media(prefers-reduced-motion:reduce){.course-card{transform:none!important}}