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textarea::placeholder{color:#a6b1b9}.note-form textarea:focus{outline:0}.note-form:focus-within{border-color:#73b4a0;box-shadow:0 0 0 2px #73b4a01a}.note-form-footer{display:flex;justify-content:space-between;align-items:center;padding:10px 13px;background:#f3f8f5;border-top:1px solid #e7eeeb}.note-form-footer>span{font-size:10px;color:#87a18f}.note-form .button{font-size:10px;padding:7px 12px}.note-form .icon{width:13px;height:13px}.note-list-empty{text-align:center;padding:36px 10px 16px;color:#aac1b5}.note-list-empty>.icon{display:block;margin:0 auto 12px;width:26px;height:26px}.note-list-empty strong{display:block;color:#7d9488;font-size:11px;font-weight:500}.note-list-empty p{font-size:10px;margin-top:5px;color:#b0bbb5}.saved-note{border-bottom:1px solid #edf1f2;padding:16px 0}.saved-note:last-child{border-bottom:0}.saved-note-heading{display:flex;align-items:center;justify-content:space-between}.note-time{background:#eef5f1;border:0;color:#579077;font:10px Consolas,"Microsoft YaHei UI",sans-serif;padding:4px 7px;border-radius:5px}.note-time:disabled{opacity:1}.saved-note>p{font-size:12px;color:#526b7b;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.9;margin-top:6px}.delete-note{color:#aebbc2;width:27px;height:27px}.delete-note:hover{color:#b15a59;background:#fff0ed}.delete-note .icon{width:14px;height:14px}.lesson-practice-card{display:flex;gap:23px;padding:8px 0}.practice-icon{display:grid;place-content:center;flex-shrink:0;width:67px;height:67px;border-radius:15px;background:#edf5f0;color:#548f72}.practice-icon .icon{width:31px;height:31px}.lesson-practice-card .eyebrow{font-size:9px}.lesson-practice-card h2{margin:10px 0}.lesson-practice-card p{font-size:12px;line-height:1.9;margin-bottom:18px}.lesson-practice-card .button{font-size:11px}.lesson-practice-card .icon{width:16px}.theater .watch-grid{grid-template-columns:minmax(0,1fr)}.theater .lesson-catalog{position:static}.theater .catalog-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));max-height:330px}.theater .video-stage{max-height:75vh}.theater .watch-content{max-width:1500px}
.modal{border:1px solid #e2e9e6;border-radius:16px;background:white;box-shadow:0 25px 100px #102b3a35;padding:27px 30px;max-width:480px;width:calc(100% - 32px);color:var(--ink)}.modal::backdrop{background:#0b202f99;backdrop-filter:blur(3px)}.modal-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:22px}.modal-heading h2{font-size:20px}.modal>p{font-size:12px;line-height:1.9;margin:17px 0}.book-details{font-size:12px;margin-top:22px}.book-details>div{display:flex;border-bottom:1px solid #eef2f2;padding:10px 0;gap:25px}.book-details dt{color:#95a59d;width:75px;flex-shrink:0}.book-details dd{margin:0;color:#506c5c}.modal>p.small{font-size:10px}.source-modal .modal-heading{margin-bottom:15px}.source-modal .modal-heading h2{margin-top:5px}.form-label{display:block;font-size:11px;font-weight:600;margin-bottom:8px}.form-input{width:100%;border:1px solid #dce6e0;background:#fafcfb;border-radius:8px;padding:11px 12px;font-size:12px}.form-error{color:#b45e4d!important;font-size:11px!important;margin:9px 0!important}.full-width{width:100%;margin-top:13px;font-size:12px}.divider-label{display:flex;align-items:center;gap:13px;margin:20px 0;color:#a2b1a9;font-size:10px}.divider-label:before,.divider-label:after{content:"";height:1px;background:#e7eee9;flex:1}.local-video-picker{position:relative;border:1px dashed #bfd3c7;border-radius:10px;display:flex;align-items:center;flex-direction:column;padding:22px 15px;gap:5px;background:#f6faf7;color:#70907d;cursor:pointer}.local-video-picker:hover{border-color:#559a76;background:#eff7f1}.local-video-picker strong{font-size:12px;font-weight:500}.local-video-picker small{font-size:9px;color:#97ac9e}.local-video-picker input{position:absolute;inset:0;opacity:0;width:100%;cursor:pointer}.local-video-picker:focus-within{outline:2px solid #73a988;outline-offset:3px}.danger{color:#ac7169}.toast{position:fixed;left:50%;bottom:30px;transform:translateX(-50%);padding:12px 20px;border-radius:9px;background:#183f31;color:#e3f8ed;box-shadow:0 8px 30px #1c3b3333;font-size:12px;z-index:100;max-width:calc(100% - 32px);text-align:center}
@media(min-width:1600px){.home-content{padding-top:40px}.course-hero{min-height:390px}.hero-copy{padding:38px 0 34px 44px}.hero-copy h2{font-size:35px}.hero-copy>p{font-size:13px;max-width:440px}.hero-actions{margin-top:30px}.hero-art img{max-width:580px}.chapter-card{min-height:213px}.chapter-card h3{font-size:15px}.chapter-card>p{font-size:11px}.watch-grid{grid-template-columns:minmax(0,1fr) 340px}}
@media(max-width:1200px){.sidebar{width:190px;padding:26px 16px}.brand{gap:9px}.brand strong{font-size:14px}.brand-symbol{width:38px;height:40px;font-size:27px}.home-workspace{margin-left:190px}.portal-topbar{padding:0 28px}.home-content{padding:27px 28px 0}.hero-copy{padding-left:27px}.hero-copy h2{font-size:26px}.hero-art img{transform:scale(1.15)}.hero-kicker>span:last-child{font-size:9px}.hero-actions{gap:8px}.hero-actions .button{padding:10px 12px;font-size:11px}.overview-icon{width:36px;height:36px}.overview-item{gap:10px}.learning-overview{gap:12px;padding:20px}.overview-progress{padding-left:15px}.chapter-grid{gap:13px}.chapter-card{padding:16px 16px 12px}.home-bottom-grid{grid-template-columns:1fr}.practice-callout{padding:22px 25px}.practice-visual{height:100px}.watch-topbar{padding:0 26px;gap:25px}.watch-course-name{padding-left:22px;gap:10px}.watch-content{padding:24px 26px 35px}.watch-grid{grid-template-columns:minmax(0,1fr) 280px;gap:20px}.catalog-heading{padding:20px 17px 15px}.catalog-lesson{padding:15px 14px;gap:10px}.video-empty h2{font-size:18px}.play-outline{width:45px;height:45px;margin-bottom:12px}.video-empty p{font-size:10px}.video-source-button{margin-top:15px}.lesson-tabs{gap:22px;padding:0 22px}.tab-panel{padding:23px}}
@media(max-width:980px){.sidebar{width:76px;padding:23px 12px;align-items:center}.sidebar .brand>span:last-child,.nav-caption,.sidebar-note,.sidebar-foot,.nav-external{display:none}.sidebar nav{margin-top:35px;width:100%}.sidebar .nav-link{font-size:0;gap:0;justify-content:center;padding:13px}.sidebar .nav-link>.icon,.sidebar .nav-link>[data-icon]:first-child{display:flex}.sidebar .nav-link .icon{width:20px}.home-workspace{margin-left:76px}.course-hero{min-height:320px;grid-template-columns:1.16fr 1fr}.hero-copy h2{font-size:26px}.hero-copy>p{font-size:11px}.hero-art img{transform:scale(1.25)}.art-caption{right:20px;font-size:9px}.hero-kicker>span:last-child{display:none}.watch-course-name .tag{display:none}.watch-grid{grid-template-columns:minmax(0,1fr) 255px;gap:16px}.watch-heading h1{font-size:22px}.video-empty h2{font-size:17px}.video-empty p{font-size:10px;max-width:280px}.video-label{font-size:8px}.play-outline{margin-bottom:7px;width:37px;height:37px}.play-outline .icon{width:18px}.video-source-button{padding:6px 10px;margin-top:10px}.video-empty-copy{padding:12px}.tab-panel{padding:20px}.notes-panel-heading{align-items:flex-start}.notes-panel-heading .text-button{white-space:nowrap}.catalog-lesson strong{font-size:10px}.catalog-lesson small{font-size:8px}.catalog-list{max-height:650px}}
@media(max-width:760px){.portal-topbar{padding:0 22px;height:65px}.home-content{padding:23px 22px 0}.topbar-actions{gap:14px}.profile>span:last-child{display:none}.page-heading{margin-bottom:20px}.page-heading h1{font-size:22px}.course-type{display:none}.course-hero{grid-template-columns:1fr;min-height:0}.hero-copy{padding:27px}.hero-copy h2{font-size:29px}.hero-copy>p{max-width:420px}.hero-art{display:none}.hero-kicker>span:last-child{display:inline}.hero-actions .button{font-size:12px}.learning-overview{grid-template-columns:1fr 1fr 1fr;gap:10px;padding:19px 16px}.overview-item{gap:8px}.overview-item strong{font-size:22px}.overview-icon{width:32px;height:32px}.overview-icon .icon{width:16px}.overview-item>div>span{font-size:9px}.overview-progress{grid-column:1/-1;border-left:0;border-top:1px solid var(--line);padding:13px 0 0;margin-top:6px}.overview-progress small{display:none}.overview-progress progress{margin-bottom:0}.section-top h2{font-size:16px}.section-count{display:none}.directory-toolbar{align-items:stretch;flex-direction:column;gap:12px;margin-top:19px}.filter-group{align-self:flex-start}.search-field{width:100%}.chapter-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.chapter-card{min-height:209px}.chapter-card h3{font-size:13px}.chapter-card>p{font-size:10px}.practice-callout{padding:20px}.practice-visual{width:76px;height:105px}.practice-callout h2{font-size:15px}.page-footer{align-items:flex-start;flex-direction:column;font-size:8px}.page-footer .text-button{font-size:8px}.watch-topbar{height:66px;padding:0 20px}.watch-course-name{display:none}.watch-content{padding:22px 20px 32px}.watch-grid{grid-template-columns:minmax(0,1fr);gap:24px}.watch-heading h1{font-size:21px}.watch-heading{align-items:flex-start;gap:15px}.source-button{padding:8px 10px;font-size:10px;margin-top:24px}.source-button .icon{width:13px}.watch-heading .breadcrumb{font-size:9px;flex-wrap:wrap;gap:7px}.video-empty h2{font-size:20px;margin:9px 0}.video-empty p{font-size:11px;max-width:350px}.play-outline{width:48px;height:48px;margin-bottom:11px}.video-source-button{padding:7px 12px;margin-top:15px}.lesson-catalog{position:static}.catalog-list{max-height:420px}.catalog-lesson{padding:15px 20px}.catalog-lesson strong{font-size:12px}.catalog-lesson small{font-size:10px}.catalog-video-state{font-size:9px}.catalog-heading{padding:21px}.theater .catalog-list{grid-template-columns:1fr 1fr}.lesson-pagination{margin-top:18px}.lesson-pagination strong{font-size:10px}.lesson-tabs{gap:25px}.lesson-detail h2{font-size:14px}}
@media(max-width:480px){.sidebar{position:sticky;top:0;left:0;width:100%;height:59px;padding:0 16px;flex-direction:row;justify-content:space-between;border-bottom:1px solid #274153}.sidebar .brand>span:last-child{display:block}.sidebar .brand strong{font-size:12px}.sidebar .brand small{display:none}.sidebar .brand-symbol{width:31px;height:33px;font-size:23px;padding:5px 5px 5px 4px;border-radius:8px}.sidebar nav{display:flex;gap:2px;width:auto;margin:0}.sidebar .nav-link{padding:10px;border-radius:7px}.sidebar .nav-link.active{box-shadow:none}.sidebar .nav-link .icon{width:17px;height:17px}.sidebar .nav-link:nth-child(2){display:none}.home-workspace{margin-left:0}.portal-topbar{height:52px;padding:0 18px}.topbar-actions{gap:13px}.portal-topbar .text-button{font-size:10px}.portal-topbar .text-button .icon{width:14px;height:14px}.breadcrumb{font-size:10px;gap:8px}.avatar{width:25px;height:25px;font-size:10px}.home-content{padding:24px 18px 0}.page-heading .eyebrow{font-size:9px}.page-heading h1{font-size:23px}.page-heading p{font-size:11px}.course-hero{border-radius:14px}.hero-copy{padding:24px 23px}.hero-copy h2{font-size:27px;margin-top:17px}.hero-copy>p{font-size:11px}.hero-kicker{gap:8px}.hero-kicker>span:last-child{font-size:8px}.hero-kicker .tag{font-size:9px}.hero-actions{gap:8px;margin-top:20px}.hero-actions .button{padding:10px 12px;font-size:10px}.hero-actions .icon{width:15px;height:15px}.hero-next{font-size:8px;gap:7px}.learning-overview{padding:17px 13px;gap:7px;border-radius:11px;margin-top:14px}.overview-item{gap:7px}.overview-icon{width:29px;height:29px;border-radius:8px}.overview-icon .icon{width:14px;height:14px}.overview-item>div>span{font-size:8px}.overview-item strong{font-size:20px}.overview-item strong small{font-size:9px}.overview-progress>div{font-size:9px}.directory-section{margin-top:29px}.section-top h2{font-size:16px}.section-top p{font-size:10px}.filter-button{padding:6px 12px;font-size:10px}.chapter-grid{gap:10px}.chapter-card{padding:14px 13px 11px;min-height:213px;border-radius:10px}.chapter-card h3{font-size:12px;line-height:1.7;margin-bottom:7px}.chapter-card-top{margin-bottom:14px}.chapter-number{width:32px;height:30px;font-size:18px}.chapter-state{font-size:8px}.chapter-card>p{font-size:9px;line-height:1.9}.chapter-card-foot{font-size:8px}.chapter-card-foot .icon{width:11px}.home-bottom-grid{margin-top:22px;gap:15px}.practice-visual{display:none}.practice-callout{padding:22px}.practice-callout p{font-size:10px}.recent-notes{padding:20px}.notes-empty{padding-top:25px}.page-footer{line-height:1.9}.watch-topbar{padding:0 17px;height:62px;gap:10px}.watch-topbar .brand{gap:7px}.watch-topbar .brand-symbol{width:33px;height:35px;font-size:24px;padding:5px}.watch-topbar .brand strong{font-size:12px}.watch-topbar .brand small{font-size:7px;letter-spacing:1px}.back-home{font-size:9px;gap:5px}.back-home .icon{width:14px}.watch-content{padding:19px 14px 30px}.watch-heading{display:block;margin-bottom:18px}.watch-heading h1{font-size:21px;margin-top:9px}.source-button{margin-top:14px;padding:7px 11px;font-size:10px}.video-shell{border-radius:10px}.video-empty-copy{padding:10px 20px}.video-empty h2{font-size:16px;margin:6px 0}.video-empty p{font-size:9px;line-height:1.8;max-width:280px}.video-label{font-size:7px}.play-outline{width:31px;height:31px;margin-bottom:5px}.play-outline .icon{width:14px;height:14px}.video-source-button{font-size:9px;padding:5px 10px;margin-top:10px}.video-source-button .icon{width:12px;height:12px}.player-toolbar{padding:6px 10px;min-height:38px}.player-toolbar>#source-status{font-size:8px}.player-tools{gap:7px}.player-tool{padding:4px}.player-tool .icon{width:14px;height:14px}.speed-label select{font-size:9px;width:52px}.lesson-status-row{margin:14px 0 19px}.lesson-status{font-size:9px;gap:6px}.small-button{padding:7px 9px;font-size:9px;gap:5px}.lesson-tabs{padding:0 18px;gap:23px}.lesson-tab{font-size:11px;padding:15px 0 13px}.tab-panel{padding:21px 18px}.lesson-summary{font-size:11px;margin-bottom:20px}.objective-list{gap:12px}.objective-list li{gap:9px}.objective-list p{font-size:11px}.knowledge-box{padding:15px;margin-top:21px}.guide-note{font-size:9px}.notes-panel-heading{gap:8px}.notes-panel-heading h2{font-size:13px}.notes-panel-heading p{font-size:9px}.notes-panel-heading .text-button{font-size:9px;gap:3px}.notes-panel-heading .icon{width:12px}.note-form textarea{font-size:11px;padding:12px}.note-form-footer{padding:8px 10px}.note-form-footer>span{font-size:9px}.note-form .button{font-size:9px;padding:6px 9px;gap:4px}.saved-note>p{font-size:11px}.lesson-practice-card{gap:13px}.practice-icon{width:40px;height:45px;border-radius:9px}.practice-icon .icon{width:22px;height:22px}.lesson-practice-card .eyebrow{font-size:7px;letter-spacing:1px}.lesson-practice-card p{font-size:11px}.lesson-pagination{gap:18px}.lesson-pagination a{gap:6px}.lesson-pagination strong{font-size:9px}.lesson-pagination .icon{width:13px}.catalog-lesson strong{font-size:11px}.theater .catalog-list{grid-template-columns:1fr}.modal{padding:23px}.modal-heading h2{font-size:18px}.toast{font-size:11px;bottom:18px;white-space:normal}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}

/* ===== 多视图路由：视图切换（非页内锚点滚动） ===== */
.view{display:none}
.view.active{display:block;animation:viewIn .18s ease}
@keyframes viewIn{from{opacity:.45;transform:translateY(4px)}to{opacity:1;transform:none}}

/* 学习笔记界面 */
.all-notes-list{display:flex;flex-direction:column;gap:12px;margin-top:24px}
.note-row{border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:#fff;box-shadow:0 4px 14px #1933430a}
.note-meta{font-size:12px;color:var(--green);font-weight:600;text-decoration:none;display:inline-block;margin-bottom:8px}
.note-meta:hover{text-decoration:underline}
.note-text{margin:0;color:var(--ink);font-size:13px;line-height:1.8;white-space:pre-wrap;word-break:break-word}
.note-actions{display:flex;gap:14px;margin-top:12px;padding-top:12px;border-top:1px dashed var(--line)}
.note-actions .text-button{padding:0;font-size:12px}
.note-actions .danger{color:#b45e4d}
.section-count strong{font-size:18px;color:var(--green)}