.classroom-page{max-width:1280px;margin:0 auto;padding:36px 28px 70px;color:#173348}.classroom-page *,.classroom-present *{box-sizing:border-box}.classroom-page h1{font-size:32px;line-height:1.3;margin:8px 0 14px;overflow-wrap:anywhere}.classroom-page h2{font-size:25px}.classroom-page h3{font-size:21px;margin:7px 0;overflow-wrap:anywhere}.classroom-page p{font-size:18px;line-height:1.7;color:#536779}.classroom-eyebrow{color:#157967!important;font-weight:650}.classroom-heading{display:flex;justify-content:space-between;align-items:center;gap:24px;margin:16px 0 24px}.classroom-heading>div{min-width:0}.classroom-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.classroom-actions form{margin:0}.classroom-page button,.classroom-page .classroom-primary,.classroom-present button,.classroom-present a{display:inline-flex;justify-content:center;align-items:center;min-height:44px;padding:10px 16px;border:1px solid #bcced4;border-radius:9px;background:white;color:#173348;font:inherit;font-size:18px;text-decoration:none;cursor:pointer}.classroom-page .classroom-primary{background:#146c61;color:white;border-color:#146c61;font-weight:650}.classroom-page button:hover,.classroom-present button:hover{background:#e8f5ef}.classroom-page button:disabled,.classroom-present button:disabled{opacity:.45;cursor:default}.classroom-page input,.classroom-page select{min-height:46px;border:1px solid #a5bcc5;border-radius:8px;padding:10px 12px;background:#fff;color:#173348;font-size:18px;max-width:100%;min-width:0}.classroom-page label{font-size:18px}.classroom-link{display:inline-block;margin:10px 16px 10px 0;color:#146c61;font-size:18px}.classroom-create{display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding:24px;background:#eaf3f0;border-radius:14px;margin-bottom:30px}.classroom-create input{flex:1;min-width:220px}.classroom-grid,.classroom-benefits{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.classroom-card,.classroom-benefits article,.classroom-resource{border:1px solid #d9e3e7;border-radius:14px;background:#fff;padding:24px;min-width:0}.classroom-card h2{overflow-wrap:anywhere}.classroom-card a{color:inherit}.classroom-welcome{padding:30px 0}.classroom-welcome>p{max-width:780px;font-size:21px}.classroom-benefits{margin:30px 0}.classroom-benefits b{font-size:22px}.classroom-empty{grid-column:1/-1;padding:28px;background:#f0f5f5;border-radius:12px}.classroom-settings{padding:16px;background:#eef3f4;border-radius:10px;margin-bottom:26px}.classroom-settings summary{cursor:pointer;font-size:18px;min-height:36px}.classroom-settings form{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:12px 0}.classroom-sequence{padding:0;list-style:none;display:grid;gap:12px}.classroom-sequence li{display:flex;gap:20px;align-items:center;border:1px solid #d8e3e7;border-radius:12px;padding:20px;background:white}.classroom-number{font-size:25px;font-weight:700;color:#147765}.classroom-item-copy{flex:1;min-width:0}.classroom-page small{font-size:16px;color:#536779}.classroom-current{color:#146c61;font-size:16px}.classroom-filters{display:flex;align-items:center;gap:20px;flex-wrap:wrap;margin:20px 0}.classroom-filters label{display:flex;gap:10px;align-items:center}.classroom-resource-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.classroom-resource{display:flex;flex-direction:column}.classroom-resource p{flex:1}.classroom-resource[hidden],#resource-empty[hidden]{display:none}.classroom-present{margin:0;background:#edf3f5;color:#173348;font-family:system-ui,"Microsoft YaHei",sans-serif;height:100dvh;display:flex;flex-direction:column;overflow:hidden}.classroom-present-bar{display:flex;align-items:center;gap:18px;padding:10px 18px;background:#fff;border-bottom:1px solid #d9e3e7;flex-shrink:0}.classroom-present-bar>div{flex:1;min-width:0}.classroom-present-bar h1{font-size:22px;margin:3px 0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.classroom-present-bar small{font-size:15px}.classroom-present-bar nav{display:flex;gap:10px;flex-wrap:wrap}.classroom-stage{width:100%;flex:1;min-height:0;border:0;background:#fff}.classroom-present-help{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:0 14px;font-size:14px;flex-shrink:0}.classroom-present-help a{font-size:15px;background:transparent;border:0}.classroom-page :focus-visible,.classroom-present :focus-visible{outline:3px solid #138dba;outline-offset:3px}
@media(max-width:900px){.site-header{height:auto;min-height:72px;flex-wrap:wrap;gap:10px;padding:12px 0}.site-header nav{width:100%;flex-wrap:wrap;gap:10px}.site-header nav .nav-home,.site-header nav .nav-lessons,.site-header nav .nav-classrooms{display:inline-flex!important;align-items:center;min-height:44px}}
@media(max-width:1000px){.classroom-grid,.classroom-resource-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.classroom-sequence li{flex-wrap:wrap}.classroom-sequence .classroom-actions{width:100%;padding-left:30px}.classroom-present-bar{flex-wrap:wrap}.classroom-present-bar nav{width:100%;justify-content:flex-end}}
@media(max-width:600px){.classroom-page{padding:22px 16px 45px}.classroom-page h1{font-size:28px}.classroom-heading{align-items:flex-start;flex-direction:column}.classroom-grid,.classroom-resource-grid,.classroom-benefits{grid-template-columns:1fr}.classroom-create{padding:18px;align-items:stretch;flex-direction:column}.classroom-create input{min-width:0;width:100%}.classroom-filters{align-items:stretch;flex-direction:column}.classroom-filters input{width:100%}.classroom-sequence li{padding:16px;gap:12px}.classroom-sequence .classroom-actions{padding-left:0}.classroom-present-bar{gap:8px;padding:8px}.classroom-present-bar>a{font-size:16px;padding:8px}.classroom-present-bar h1{font-size:18px}.classroom-present-bar small{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.classroom-present-bar nav{justify-content:center;gap:8px}.classroom-present-help{flex-wrap:wrap;gap:0;padding:4px 10px}.classroom-present-help>span:first-child{font-size:12px}.site-header nav .nav-classrooms{display:inline-flex}}

/* 账号收藏独立于课堂清单，保持与新建表单的分区间距。 */
#my-favorites{margin:24px 0 30px}

/* 授课容器不占用模型空间；课堂目录只在需要时浮出。 */
.classroom-content{position:absolute;inset:0}.classroom-content>.classroom-stage{display:block;width:100%;height:100%;border:0}.classroom-content>.classroom-empty{margin:24px}
.classroom-dock{position:fixed;right:18px;top:96px;z-index:1000;font-size:16px}.classroom-present .classroom-handle{min-height:42px;padding:8px 14px;gap:9px;background:#173e43;color:#fff;border:1px solid #ffffff55;border-radius:24px;box-shadow:0 3px 14px #102d3330;font-size:16px;touch-action:none;user-select:none;cursor:grab}.classroom-present .classroom-handle:active{cursor:grabbing}.classroom-progress{font-variant-numeric:tabular-nums;color:#aff1d8}.classroom-dock[data-dragging] .classroom-handle{cursor:grabbing}
#classroom-panel{position:absolute;right:0;top:50px;width:354px;max-width:calc(100vw - 24px);max-height:calc(100dvh - 76px);display:flex;flex-direction:column;overflow:hidden;border:1px solid #d5e3e0;border-radius:18px;background:#fff;box-shadow:0 12px 48px #14353730;color:#173348}#classroom-panel[hidden]{display:none}#classroom-panel header{display:flex;align-items:center;gap:12px;padding:20px 18px 12px}#classroom-panel header>div{flex:1;min-width:0}#classroom-panel h1{font-size:21px;line-height:1.4;margin:4px 0;overflow-wrap:anywhere}#classroom-panel small{font-size:13px;color:#627b7b}.classroom-present .classroom-close{border:0;font-size:26px;padding:0;width:40px;min-height:40px}.classroom-step{display:flex;gap:10px;padding:0 18px 14px}.classroom-step form{flex:1;margin:0}.classroom-step button{width:100%;font-size:16px}.classroom-directory{list-style:none;overflow:auto;min-height:0;margin:0;padding:6px 12px;border-block:1px solid #e5ecea}.classroom-directory li{margin:5px 0}.classroom-directory form{margin:0}.classroom-present .classroom-directory button{width:100%;justify-content:flex-start;text-align:left;font-size:16px;line-height:1.5;gap:12px;border:0;background:#f5f8f7;overflow-wrap:anywhere;padding:12px}.classroom-present .classroom-directory button:hover{background:#e6f3ed}.classroom-present .classroom-directory [aria-current] button,.classroom-present [aria-current] .classroom-current-item{background:#e0f4e9;color:#14664e}.classroom-directory small{display:block;margin-top:3px}.classroom-directory b{font-size:20px}.classroom-present #classroom-panel footer{display:flex;gap:4px;flex-wrap:wrap;padding:10px 12px 0}.classroom-present #classroom-panel footer :is(a,button){font-size:14px;padding:8px 10px;border:0;background:transparent}.classroom-note{font-size:12px;line-height:1.6;margin:8px 18px 16px;color:#667b7c}#classroom-status:empty{display:none}#classroom-status{margin:0 18px 16px;font-size:14px;color:#9a442c}
.classroom-present .classroom-handle:hover,.classroom-present .classroom-handle:focus-visible{background:#20545a;color:#fff}.classroom-dock{right:96px}

.classroom-directory .classroom-preload-status{display:block;font-size:12px;color:#607b75;padding:2px 12px 6px}.classroom-preload-summary{font-size:12px;line-height:1.6;color:#426b60;margin:8px 18px 0}

/* 我的课堂 · 科学备课工作台。只作用于列表与备课页。 */
.classroom-studio{--studio-ink:#183e43;--studio-green:#126958;--studio-line:#d9e6e2;max-width:1540px;padding:28px 36px 64px;color:var(--studio-ink)}
.classroom-studio [hidden]{display:none!important}.classroom-studio p{font-size:15px;line-height:1.7}.classroom-studio h2{font-size:23px}.classroom-studio h3{font-size:18px;line-height:1.5}.classroom-studio small{font-size:13px}.classroom-studio button,.classroom-studio .classroom-primary{font-size:15px;min-height:42px;border-radius:10px}.classroom-studio input,.classroom-studio select{font-size:15px;min-height:44px;border-color:var(--studio-line)}.classroom-studio .classroom-primary{background:#126958;border-color:#126958;color:#fff;gap:22px;box-shadow:0 3px 8px #12695815}.classroom-studio .classroom-primary:hover{background:#0a5546;color:#fff}.classroom-studio .classroom-eyebrow{font-size:12px;font-weight:700;letter-spacing:.08em;margin:0 0 8px}.studio-sr{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
.studio-hero{background:#123e41;border-radius:24px;min-height:246px;padding:36px 44px;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:space-between;gap:28px;color:#fff}.studio-hero:before{content:'';position:absolute;inset:0;opacity:.14;background-image:radial-gradient(#aee6cb 1px,transparent 1px);background-size:22px 22px;pointer-events:none}.studio-hero>div{position:relative}.studio-hero .classroom-eyebrow{color:#9ce5c9!important}.studio-hero h1{font-size:38px;letter-spacing:.02em;margin:10px 0;color:#fff}.studio-hero p{color:#c4deda;margin:0}.studio-metrics{display:flex;gap:25px;align-items:center;margin-top:24px;font-size:13px;color:#c4deda}.studio-metrics b{font-size:24px;color:#b1f1cf;margin-right:7px;font-weight:600}.studio-metrics>span+span{border-left:1px solid #ffffff2b;padding-left:25px}.studio-hero-art{width:250px;height:180px;flex-shrink:0;margin-right:35px}.studio-hero-art>b{display:block;position:absolute;left:64px;top:15px;font-size:29px;line-height:1.42;letter-spacing:9px;transform:rotate(-7deg);color:#d9f8d7}.studio-hero-art b span{display:block;font-size:9px;letter-spacing:2px;margin-top:8px;color:#a7d1c7}.orbit{position:absolute;inset:19px 0;border:1px solid #9fdec86b;border-radius:50%;transform:rotate(-30deg)}.orbit-two{transform:rotate(53deg);inset:-2px 40px}.orbit-dot{position:absolute;left:20px;top:105px;width:16px;height:16px;background:#c6ee89;border-radius:50%;box-shadow:0 0 0 7px #c6ee8915}
.studio-start{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:22px 26px;margin:22px 0 32px;background:#fff;border:1px solid var(--studio-line);border-radius:18px}.studio-start>div{display:flex;align-items:center;gap:16px}.studio-start h2{font-size:18px;margin:0 0 4px}.studio-start p{margin:0;font-size:13px}.studio-plus{display:grid;place-items:center;width:48px;height:48px;border-radius:14px;font-size:30px;background:#e9f5eb;color:#23735c}.studio-start .classroom-create{background:none;margin:0;padding:0;flex:1;max-width:660px;gap:12px}.studio-start input{background:#f7faf9}.studio-section-title{display:flex;align-items:center;justify-content:space-between;margin:0 0 20px;gap:20px}.studio-section-title h2{margin:0}.studio-section-title h2 small{display:inline-block;padding:2px 10px;border-radius:30px;background:#e6efeb;color:#347567;vertical-align:middle;margin-left:8px}.studio-search{display:flex;align-items:center;gap:8px;border:1px solid var(--studio-line);background:white;border-radius:12px;padding-left:14px;color:#74928b}.studio-search input{border:0;background:transparent;width:240px}.studio-search>span{font-size:25px}
.studio-class-list{gap:22px}.studio-course{padding:0;overflow:hidden;border-radius:18px;box-shadow:0 4px 14px #183e4305;transition:transform .15s,box-shadow .15s}.studio-course:hover{transform:translateY(-3px);box-shadow:0 10px 26px #183e4310}.studio-course-cover{position:relative;overflow:hidden;background:#e3f0e7;height:96px;padding:20px 24px;display:flex;justify-content:space-between;align-items:flex-start;color:#236653}.studio-course-cover:after{content:'';width:150px;height:150px;position:absolute;right:35px;top:-30px;border:1px solid currentColor;opacity:.18;border-radius:50%;box-shadow:0 0 0 22px #ffffff44,0 0 0 44px #ffffff22}.studio-course-cover>span{font-size:12px;border:1px solid #23665330;border-radius:6px;padding:4px 8px}.studio-course-cover>b{font-size:46px;font-weight:400;line-height:1;opacity:.65;z-index:1}.studio-course-cover>i{position:absolute;font-size:33px;left:27px;bottom:-7px;opacity:.32;font-style:normal}.studio-course:nth-child(3n+2) .studio-course-cover{background:#e7eef8;color:#3b668d}.studio-course:nth-child(3n+3) .studio-course-cover{background:#f6eddc;color:#927038}.studio-course-body{padding:22px 24px 24px}.studio-course-meta{display:flex;justify-content:space-between;font-size:12px;color:#647e76}.studio-course-meta small{font-size:12px;color:#347567}.studio-course h2{font-size:21px;line-height:1.45;margin:12px 0;min-height:61px}.studio-course-body>p{font-size:13px;margin:0 0 22px}.studio-course .classroom-actions{padding-top:18px;border-top:1px solid #e8efec;justify-content:space-between}.studio-secondary{font-size:14px;color:#43766a!important;padding:10px 0}.studio-favorites{border-top:1px solid var(--studio-line);padding-top:24px!important;margin-top:38px!important}.studio-favorites summary{font-size:20px;font-weight:600;cursor:pointer;padding:8px 0}.studio-favorites summary span{font-size:13px;font-weight:400;color:#71857e;margin-left:16px}.studio-favorites .classroom-grid{margin-top:18px}.studio-empty{text-align:center;background:#edf5ef;border:1px dashed #bad4c5;padding:45px}.studio-empty>span{font-size:36px;color:#478b72}
.classroom-editor>.classroom-link{font-size:13px;margin:0 0 12px}.classroom-editor>.classroom-heading{margin:0 0 25px;align-items:center}.classroom-editor>.classroom-heading h1{font-size:29px;margin:3px 0 7px}.classroom-editor>.classroom-heading p{margin-bottom:0}.studio-workspace{display:grid;grid-template-columns:minmax(330px,.85fr) minmax(0,1.65fr);align-items:start;gap:24px}.studio-outline{position:sticky;top:20px;max-height:calc(100dvh - 40px);overflow:auto;scrollbar-width:thin;background:#fff;border:1px solid var(--studio-line);border-radius:18px;padding:22px}.studio-panel-heading{display:flex;align-items:center;gap:13px;margin:0 0 18px}.studio-panel-heading h2{font-size:20px;margin:0 0 4px}.studio-panel-heading p{font-size:12px;margin:0;color:#71857e}.studio-step{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:#173f43;color:#c3efcd;font-size:15px;font-weight:600;flex-shrink:0}.studio-outline .classroom-sequence{margin:0;gap:10px}.studio-outline .classroom-sequence>li{display:grid;grid-template-columns:28px 1fr;padding:14px 12px;gap:5px 10px;background:#f8faf9;border-color:#e1ebe5;border-radius:12px}.studio-outline .classroom-sequence>li.is-current{background:#edf7ef;border-color:#9fcbb3}.studio-outline .classroom-number{font-size:19px;line-height:1.6}.studio-outline .classroom-item-copy h3{font-size:16px;margin:5px 0;line-height:1.5}.studio-outline .classroom-item-copy small{font-size:11px}.studio-outline .classroom-current{font-size:11px;color:#2d7957}.studio-outline .classroom-actions{grid-column:2;gap:5px;flex-wrap:wrap;padding:6px 0 0;width:auto}.studio-outline .classroom-actions button{font-size:12px;min-height:32px;padding:5px 8px;border-color:#d9e5df;border-radius:7px}.studio-outline .classroom-actions form:first-child button{color:#17684e;background:white}.studio-outline .classroom-settings{margin:20px 0 0;padding:14px 0 0;border-top:1px solid #e4ece7;border-radius:0;background:transparent}.studio-outline .classroom-settings summary{font-size:13px;min-height:26px;color:#677e73}.studio-outline .classroom-settings input{width:100%}.studio-outline .classroom-settings label{font-size:13px}.studio-outline .classroom-settings p{font-size:13px}
.classroom-editor #resource-library{background:#fff;border:1px solid var(--studio-line);border-radius:18px;padding:22px;scroll-margin-top:20px}.classroom-editor .classroom-filters{display:flex;gap:10px;flex-wrap:wrap;background:#f3f7f5;padding:12px;border-radius:12px;margin:0 0 18px}.classroom-editor .classroom-filters label{font-size:12px;gap:6px;display:flex;align-items:center;flex-direction:row}.classroom-editor .classroom-filters label:first-child{width:100%;flex:auto}.classroom-editor .classroom-filters input{flex:1;width:100%;background:#fff}.classroom-editor .classroom-filters select{max-width:150px;font-size:13px;min-height:36px;padding:5px 8px}.classroom-editor #resource-count{margin-left:auto;font-size:12px;color:#6b8178;align-self:center}.classroom-editor .classroom-resource-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.classroom-editor .classroom-resource{padding:16px;border-radius:12px;border-color:#dfe9e4;transition:border-color .15s}.classroom-editor .classroom-resource:hover{border-color:#82b79b}.studio-resource-meta{display:flex;gap:7px;align-items:center}.studio-resource-meta small{font-size:11px;line-height:1.5}.studio-resource-icon{width:28px;height:28px;display:grid;place-items:center;background:#edf5ec;color:#3a8060;border-radius:8px;font-size:20px;flex-shrink:0}.classroom-resource[data-kind=lesson] .studio-resource-icon{color:#8e7136;background:#faf2df}.classroom-editor .classroom-resource h3{font-size:16px;margin:12px 0 5px}.classroom-editor .classroom-resource p{font-size:12px;line-height:1.65;margin:0 0 16px;color:#708279;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.classroom-editor .classroom-resource .classroom-actions{gap:6px;justify-content:space-between;margin-top:auto}.classroom-editor .classroom-resource button{padding:6px 9px;min-height:34px;font-size:12px;border-radius:7px}.classroom-editor .classroom-resource form:first-child button{background:#edf6ef;border-color:#d6e8dc;color:#256846}.classroom-editor .classroom-resource form:last-child button{border:0;padding-inline:3px;color:#71857a;background:none}.classroom-editor .classroom-resource button:disabled{opacity:.65}.studio-pagination{display:flex;justify-content:center;align-items:center;gap:20px;margin-top:22px}.studio-pagination span{font-size:13px;color:#657c71;font-variant-numeric:tabular-nums}.classroom-studio .studio-pagination button{font-size:13px;min-height:36px;padding:6px 12px}
@media(max-width:1200px){.classroom-studio{padding-inline:24px}.studio-workspace{grid-template-columns:330px minmax(0,1fr);gap:18px}.classroom-editor .classroom-resource-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.studio-start{gap:18px}.studio-start .classroom-create{max-width:520px}.studio-hero-art{margin-right:0}.studio-outline,.classroom-editor #resource-library{padding:18px}}
/* 首屏保留课堂操作空间，主题区域不过度占高。 */
.classroom-home .studio-hero{min-height:180px;padding:24px 36px}.classroom-home .studio-hero h1{font-size:33px}.classroom-home .studio-hero-art{height:145px}.classroom-home .studio-hero-art>b{font-size:24px;top:6px}.classroom-home .studio-metrics{margin-top:12px}.classroom-home .studio-start{padding:16px 22px;margin:16px 0 24px}.classroom-home .studio-section-title{margin-bottom:16px}.classroom-home .studio-course-cover{height:68px;padding:14px 22px}.classroom-home .studio-course-cover>b{font-size:38px}.classroom-home .studio-course-body{padding:18px 22px}.classroom-home .studio-course h2{font-size:20px;min-height:0;margin:10px 0}.classroom-home .studio-course-body>p{margin-bottom:14px}.classroom-home .studio-course .classroom-actions{padding-top:12px}.classroom-editor .classroom-resource p{font-size:13px}.studio-resource-meta small{font-size:12px}
html[data-science-theme=dark] .classroom-studio{--studio-ink:#dcece4;--studio-line:#3b534a;--studio-green:#8bd6b6}html[data-science-theme=dark] .classroom-studio :is(.studio-start,.classroom-card,.studio-outline,#resource-library,.classroom-resource,.studio-search){background:#253730;border-color:#3b534a;color:#dcece4}html[data-science-theme=dark] .classroom-studio :is(p,small,.studio-course-meta){color:#b9cdc2}html[data-science-theme=dark] .classroom-studio :is(input,select,button){background:#20332b;color:#d5e8dc;border-color:#496456}html[data-science-theme=dark] .classroom-studio .classroom-primary{background:#17775f;color:white}html[data-science-theme=dark] .classroom-studio :is(.classroom-filters,.classroom-sequence>li,.studio-empty){background:#20332b;color:#d5e8dc}html[data-science-theme=dark] .classroom-studio .classroom-sequence>li.is-current{background:#284d3b;border-color:#528568}html[data-science-theme=dark] .classroom-studio :is(.classroom-current,.studio-secondary,.classroom-link,.classroom-eyebrow){color:#94d6b6!important}html[data-science-theme=dark] .classroom-studio .classroom-resource form:first-child button{background:#304b39;color:#b6e5c6}html[data-science-theme=dark] .classroom-studio .classroom-resource form:last-child button{color:#bdd6c7}html[data-science-theme=dark] .classroom-studio .studio-outline .classroom-actions form:first-child button{background:#304b39;color:#b6e5c6}