/* v4 · 教师—孩子—AI课堂协作视觉 */
[hidden]{display:none!important}
.classroom-option-grid{display:grid!important;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:12px}
.classroom-branch-card,.imagine-branch-card{border:2px solid rgba(255,255,255,.88);border-radius:20px;background:rgba(255,250,239,.96);box-shadow:0 12px 26px rgba(55,45,75,.14);overflow:hidden;padding:0;text-align:left;cursor:pointer;transition:.22s ease;min-width:0}
.classroom-branch-card:hover,.imagine-branch-card:hover,.director-image-card.story-branch:hover{transform:translateY(-5px);box-shadow:0 18px 36px rgba(55,45,75,.22)}
.classroom-branch-card img,.imagine-branch-card img{width:100%;height:116px;object-fit:cover;display:block}
.branch-copy{display:flex;flex-direction:column;gap:4px;padding:10px}.branch-copy b{font-size:13px}.branch-copy em{font-style:normal;font-size:11px;line-height:1.45;color:#665d70}.branch-copy small{font-size:9px;line-height:1.4;color:#8c7b93}
.branch-placeholder{display:grid;place-items:center;height:116px;background:linear-gradient(135deg,#e9e1f1,#fff0d4);font-size:11px;font-weight:900;color:#81718e}
.branch-loading{grid-column:1/-1;padding:18px;border-radius:16px;background:#f3ecf6;color:#70627d;font-size:12px;font-weight:800;line-height:1.6}
#miniGameCards.classroom-option-grid{grid-template-columns:1fr;max-height:340px;overflow:auto}
#miniGameCards .classroom-branch-card{display:grid;grid-template-columns:92px 1fr}.classroom-branch-card img,#miniGameCards .branch-placeholder{height:100%;min-height:92px}.classroom-branch-card .branch-copy{padding:8px}
.imagine-branch-card{position:relative}.imagine-branch-card img{height:210px}.imagine-branch-card .branch-copy{padding:12px}.idea-image-gallery:has(.imagine-branch-card){display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;align-items:start}
.director-image-card.story-branch{display:flex;flex-direction:column;align-items:stretch;padding:0;border:2px solid rgba(255,255,255,.8);border-radius:20px;background:#fffaf0;overflow:hidden;transition:.22s ease}.director-image-card.story-branch img{width:100%;aspect-ratio:4/3;object-fit:cover}.director-image-card.story-branch span{display:flex;flex-direction:column;gap:4px;padding:10px;text-align:left;font-size:11px;line-height:1.45}.director-image-card.story-branch span b{font-size:13px}.director-image-card.story-branch small{font-size:9px;color:#85778c}.director-image-card.selected span{display:flex;flex-direction:column;gap:5px}

/* v4.2：导演候选图文分区，说明文字不再覆盖画面 */
.director-image-card.story-branch{min-height:0;height:auto}
.director-image-card.story-branch img{display:block;height:auto!important;min-height:0;flex:none}
.director-image-card.story-branch span{position:static!important;inset:auto!important;left:auto!important;right:auto!important;bottom:auto!important;flex:1;box-sizing:border-box;width:100%;min-height:112px;padding:12px 13px 13px!important;border-radius:0!important;background:#fffaf0!important;color:#3f3550!important;text-shadow:none!important}
.director-image-card.story-branch span b{color:#302740;font-size:14px}
.director-image-card.story-branch small{color:#776a83;font-size:10px;line-height:1.45}
.director-image-card.selected{display:flex;flex-direction:column;height:auto;min-height:0;padding:0;background:#fffaf0;overflow:hidden}
.director-image-card.selected img{display:block;width:100%;height:auto!important;aspect-ratio:4/3;object-fit:cover}
.director-image-card.selected span{position:static!important;inset:auto!important;padding:12px 13px!important;border-radius:0!important;background:#fffaf0!important;color:#3f3550!important;text-shadow:none!important}

/* 使用说明独立页面 */
body.usage-guide-open{overflow:hidden}
.usage-guide-page[hidden]{display:none}
.usage-guide-page{position:fixed;inset:0;z-index:9999;overflow:auto;padding:24px;background:radial-gradient(circle at 15% 10%,rgba(255,237,179,.9),transparent 35%),linear-gradient(145deg,#261f52 0%,#51336d 52%,#233e68 100%);color:#342b49}
.usage-guide-shell{width:min(1120px,calc(100% - 20px));margin:0 auto 36px;border:2px solid rgba(255,255,255,.75);border-radius:30px;background:rgba(255,251,246,.97);box-shadow:0 28px 80px rgba(16,12,44,.36);overflow:hidden}
.usage-guide-head{position:sticky;top:0;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px 26px;background:rgba(255,251,246,.96);border-bottom:1px solid #e7dbea;backdrop-filter:blur(16px)}
.usage-guide-head h2{margin:0;font-size:26px;color:#493766}.usage-guide-head p{margin:5px 0 0;color:#756984;font-size:13px}.usage-guide-close{border:0;border-radius:999px;padding:11px 18px;background:#604b8e;color:#fff;font-weight:900;cursor:pointer;white-space:nowrap}
.usage-guide-content{padding:24px 26px 30px}.usage-guide-flow{margin-bottom:20px;padding:18px 20px;border-radius:20px;background:linear-gradient(135deg,#fff0c8,#f2e9ff);border:1px solid #ead79d}.usage-guide-flow h3{margin:0 0 8px;color:#5a467a}.usage-guide-flow p{margin:0;line-height:1.75}
.usage-guide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.usage-guide-card{padding:18px;border:1px solid #eadfed;border-radius:20px;background:#fff;box-shadow:0 8px 24px rgba(63,43,86,.08)}.usage-guide-card h3{display:flex;align-items:center;gap:9px;margin:0 0 8px;color:#493766;font-size:17px}.usage-guide-card h3 i{display:grid;place-items:center;width:30px;height:30px;border-radius:10px;background:#eee5ff;font-style:normal}.usage-guide-card p{margin:0;color:#665b73;line-height:1.7;font-size:13px}.usage-guide-card ul{margin:9px 0 0;padding-left:19px;color:#665b73;font-size:13px;line-height:1.7}
@media(max-width:760px){.usage-guide-page{padding:10px}.usage-guide-shell{width:100%;border-radius:20px}.usage-guide-head{padding:16px}.usage-guide-head h2{font-size:21px}.usage-guide-content{padding:16px}.usage-guide-grid{grid-template-columns:1fr}}

/* v4.3：角色故事树 · 分类作品馆 */
#memoryActions{display:none!important}
.world-library .memory-book{border:1px solid rgba(255,255,255,.72);background:linear-gradient(135deg,rgba(255,252,244,.97),rgba(241,251,246,.96));box-shadow:0 22px 60px rgba(20,34,57,.2)}
.world-library .story-tree-library-head{padding-top:2px}
.world-library .library{padding:0 0 36px}
.story-tree-dashboard{padding:18px;border:1px solid rgba(255,255,255,.72);border-radius:26px;background:rgba(255,252,246,.94);box-shadow:0 20px 50px rgba(19,28,57,.2);backdrop-filter:blur(18px)}
.story-tree-summary{display:grid;grid-template-columns:minmax(220px,1.55fr) repeat(3,minmax(110px,.65fr));gap:12px}.story-tree-summary>div{display:flex;flex-direction:column;justify-content:center;min-height:88px;padding:15px 17px;border-radius:19px;background:linear-gradient(145deg,#f3eaff,#fff6d9);color:#4c3a67}.story-tree-summary>div:first-child{position:relative;overflow:hidden;background:linear-gradient(135deg,#604991,#8a64ab);color:#fff}.story-tree-summary>div:first-child:after{content:'✦';position:absolute;right:20px;top:8px;font-size:55px;color:rgba(255,255,255,.13)}.story-tree-summary strong{font-size:32px;line-height:1}.story-tree-summary b{font-size:25px}.story-tree-summary span{font-size:12px;font-weight:900}.story-tree-summary small{font-size:10px;opacity:.76;margin-top:4px}
.story-tree-filters{display:grid;gap:10px;margin-top:15px}.story-filter-line{display:flex;align-items:center;flex-wrap:wrap;gap:8px}.story-filter-line>b{width:72px;color:#5c4d6a;font-size:12px}.story-filter-line button{border:1px solid #e1d6e7;border-radius:999px;padding:8px 12px;background:#fff;color:#675a70;font-size:11px;font-weight:900;cursor:pointer;transition:.18s}.story-filter-line button:hover{transform:translateY(-1px);border-color:#9d82ba}.story-filter-line button.active{border-color:#684c91;background:#684c91;color:#fff;box-shadow:0 7px 18px rgba(104,76,145,.24)}
.story-tree-results{display:grid;gap:18px;margin-top:18px}.story-theme-group{padding:17px;border:1px solid rgba(255,255,255,.65);border-radius:24px;background:rgba(255,251,245,.9);box-shadow:0 15px 36px rgba(22,28,52,.14)}.story-theme-group>header{display:flex;align-items:center;justify-content:space-between;margin-bottom:13px}.story-theme-group h3{margin:0;color:#4b3b60;font-size:17px}.story-theme-group>header span{padding:5px 9px;border-radius:999px;background:#eee5f5;color:#75647f;font-size:10px;font-weight:900}
.story-tree-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px}.story-tree-book-card{min-width:0;border:1px solid #eadfed;border-radius:19px;padding:0;background:#fff;text-align:left;overflow:hidden;cursor:pointer;box-shadow:0 9px 24px rgba(64,45,81,.11);transition:.22s}.story-tree-book-card:hover{transform:translateY(-5px);box-shadow:0 18px 35px rgba(64,45,81,.19)}.story-tree-cover{position:relative;display:block;aspect-ratio:4/3;background:#e9e0ef;overflow:hidden}.story-tree-cover img{width:100%;height:100%;object-fit:cover}.story-format,.story-tree-cover em{position:absolute;top:9px;padding:5px 8px;border-radius:999px;color:#fff;font-size:9px;font-style:normal;font-weight:1000;box-shadow:0 4px 10px rgba(0,0,0,.14)}.story-format{left:9px;background:#695197}.story-format.director{background:#c56e4b}.story-tree-cover em{right:9px;background:#3f9a75}.story-tree-info{display:block;padding:12px}.story-tree-info>b{display:block;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;color:#372d45;font-size:14px}.story-meta{display:flex;flex-wrap:wrap;gap:5px;margin:9px 0}.story-meta i{padding:4px 7px;border-radius:999px;background:#f1ebf5;color:#725f7d;font-size:9px;font-style:normal;font-weight:900}.story-tree-info small{color:#95899c;font-size:9px}.story-tree-empty{padding:44px 20px;border:1px dashed rgba(255,255,255,.75);border-radius:25px;background:rgba(255,251,245,.88);text-align:center;color:#665872}.story-tree-empty i{font-size:42px;font-style:normal}.story-tree-empty h3{margin:8px 0 5px}.story-tree-empty p{margin:0;font-size:12px}.story-tree-empty.compact{padding:28px}
@media(max-width:760px){.story-tree-summary{grid-template-columns:1fr 1fr}.story-tree-summary>div:first-child{grid-column:1/3}.story-filter-line>b{width:100%}.story-tree-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
.chosen-scene{position:relative;display:inline-flex;flex-direction:column;width:86px;margin-right:7px}.chosen-scene img{width:86px;height:58px;object-fit:cover;border-radius:10px;border:2px solid #fff}.chosen-scene b{font-size:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:3px}
.generation-classroom-actions{grid-column:1/3;display:flex;gap:10px;justify-content:center}.generation-classroom-actions button{border:0;border-radius:999px;padding:11px 17px;font-weight:900;cursor:pointer}.generation-classroom-actions button:first-child{background:#65558b;color:#fff}.generation-classroom-actions button:last-child{background:#dff1e6;color:#4d7f67}
.generation-status-badge{position:absolute;z-index:40;right:22px;bottom:22px;border:2px solid rgba(255,255,255,.7);border-radius:999px;background:#65558b;color:#fff;padding:13px 18px;font-weight:900;box-shadow:0 15px 35px rgba(20,16,50,.34);cursor:pointer}.generation-status-badge.done{background:#63aa82}
.video-length-dialog{position:fixed;z-index:310;inset:0;display:none;place-items:center;background:rgba(25,20,45,.62);backdrop-filter:blur(12px)}.video-length-dialog.open{display:grid}.video-length-card{width:min(92vw,600px);position:relative;padding:30px;border-radius:32px;background:#fff9ea;box-shadow:0 30px 90px rgba(15,12,35,.45);text-align:center}.video-length-card>span{font-size:11px;font-weight:1000;color:#8b7395}.video-length-card h2{font:1000 28px/1.25 "Noto Serif CJK SC","Songti SC",serif;margin:9px 0}.video-length-card p{font-size:12px;line-height:1.7;color:#756a7c}.video-length-card>div{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:20px}.video-length-card [data-duration]{min-height:110px;border:2px solid #fff;border-radius:22px;background:linear-gradient(145deg,#e5f3ea,#fff0ca);box-shadow:0 10px 24px rgba(60,50,75,.13);cursor:pointer}.video-length-card [data-duration]:last-child{background:linear-gradient(145deg,#e9e1f5,#ffe3d7)}.video-length-card [data-duration] b,.video-length-card [data-duration] small{display:block}.video-length-card [data-duration] b{font-size:20px}.video-length-card [data-duration] small{margin-top:7px;color:#74687b}.dialog-close{position:absolute;right:16px;top:16px;width:38px;height:38px;border:0;border-radius:50%;background:#e9dfd5;font-size:24px;cursor:pointer}
.story-host .soft-kicker:after{content:' · 教师协作模式';color:#6f9b81}.world-director .director-rounds{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.idea-image-gallery:has(.imagine-branch-card){gap:7px}.imagine-branch-card img{height:130px}.branch-copy em{font-size:9px}.branch-copy small{display:none}.generation-classroom-actions{gap:6px}.generation-classroom-actions button{padding:9px 11px;font-size:10px}.video-length-card{padding:22px}.video-length-card h2{font-size:22px}}
@media(max-width:700px){.idea-image-gallery:has(.imagine-branch-card){grid-template-columns:1fr}.imagine-branch-card{display:grid;grid-template-columns:120px 1fr}.imagine-branch-card img{height:100%}.video-length-card>div{grid-template-columns:1fr}}

.classroom-book-badge{display:block;margin-top:6px;padding:4px 7px;border-radius:999px;background:#e2f2e7;color:#4f7f66;font-size:9px;font-weight:1000}.reader-classroom-path{margin-top:12px;padding:13px;border-radius:18px;background:#f0e9f5;text-align:left}.reader-classroom-path>b{font-size:13px}.reader-classroom-path p{margin:5px 0;font-size:11px;line-height:1.5}.reader-classroom-path summary{cursor:pointer;font-size:11px;font-weight:900;color:#766488;margin-top:8px}