@charset "UTF-8";
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@media(min-width:1600px){.site-header{padding-left:max(4.3%,calc((100vw - 1400px)/2));padding-right:max(4.3%,calc((100vw - 1400px)/2))}.library-hero{min-height:470px}.hero-copy h1{font-size:50px}}
@media(max-width:1100px){.site-header{gap:25px;padding:0 30px}.top-nav{margin-left:0;gap:22px}.help-link{margin-left:-8px}.global-search{width:220px}.page{padding-left:30px;padding-right:30px}.library-hero{min-height:410px;padding-left:0}.hero-copy h1{font-size:39px}.hero-art{transform:scale(.87);transform-origin:right center;margin-left:-35px}.book-cover{height:220px;padding:15px}.cover-title{margin-top:21px}.cover-title em{font-size:27px}.cover-number{right:18px;font-size:105px;top:75px}.cover-top{font-size:5px}.cover-top>span{display:none}.cover-bottom{font-size:5px}.book-grid{gap:26px 18px}.site-footer{margin:0 30px}.lesson-layout{grid-template-columns:184px minmax(0,1fr);gap:23px}.module-grid{gap:11px}.module-card{padding:15px 12px}.module-card p{font-size:9px}.module-card-bottom small{font-size:8px}.module-card-bottom .icon{width:12px}.module-card h3{font-size:13px}.overview-head h2{font-size:20px}.overview-count{font-size:39px}.resource-grid{grid-template-columns:1fr}.resource-group>.resource-grid{grid-template-columns:1fr 1fr}.resource-group .resource-card{padding:14px 12px;gap:9px}.resource-group .file-glyph{width:26px;height:35px}.ready-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.search-lessons{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:760px){.site-header{height:auto;min-height:116px;padding:17px 22px 0;display:grid;grid-template-columns:1fr auto;gap:15px 16px}.brand{font-size:16px;gap:9px}.brand-mark{width:35px;height:35px;font-size:22px}.brand small{font-size:6px;letter-spacing:1.5px;margin-top:5px}.top-nav{height:39px;grid-row:2;grid-column:1;gap:28px;font-size:11px}.global-search{grid-row:1;grid-column:2;width:160px;height:34px;gap:5px}.global-search input{font-size:10px}.global-search>span{font-size:22px}.global-search button{font-size:14px}.help-link{grid-row:2;grid-column:2;justify-self:end;align-self:start;width:21px;height:21px;margin:2px 0 0}.page{padding:25px 22px 45px}.library-page{padding-top:0}.library-hero{grid-template-columns:1fr;gap:0;min-height:0;padding:35px 0 24px;overflow:visible}.hero-copy h1{font-size:38px;letter-spacing:1px;margin-top:16px}.hero-copy p{font-size:12px;line-height:1.9;margin-bottom:20px}.hero-art{display:none}.hero-copy 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p{font-size:10px;max-width:210px;line-height:1.8}.lesson-heading-side{gap:15px;padding-top:3px}.lesson-heading-side .status{font-size:8px;padding:4px 6px}.lesson-heading-side .button.small{font-size:9px;padding:7px 8px;gap:6px}.lesson-heading-side .icon{width:12px;height:12px}.lesson-layout{grid-template-columns:1fr;gap:23px}.lesson-sidebar{border:0;border-bottom:1px solid var(--line);padding:0 0 16px;position:static;min-width:0}.sidebar-title{font-size:9px;margin:0 0 10px}.sidebar-title span{display:none}.lesson-sidebar nav{flex-direction:row;gap:6px;overflow-x:auto;padding:2px 0 7px;scrollbar-width:thin}.module-nav{flex-shrink:0;padding:8px 10px;font-size:10px;min-height:31px;gap:5px;border:1px solid #e0e5d7}.module-nav.selected{border-color:#cfdabe}.module-nav .nav-index{font-size:9px;width:12px}.module-nav .icon{width:12px;height:12px}.ready-dot{width:4px;height:4px;margin-left:2px}.sidebar-foot{display:none}.overview-head{margin-bottom:20px}.overview-head h2{font-size:20px;line-height:1.5;margin-top:7px}.overview-head .eyebrow{font-size:8px;letter-spacing:1px}.overview-head p{font-size:10px}.overview-count{font-size:34px;gap:7px}.overview-count small{font-size:8px}.module-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.module-card{min-height:175px;padding:15px 13px}.module-card p{font-size:10px}.module-card h3{font-size:13px;margin-top:13px}.module-card-bottom small{font-size:8px}.module-icon{height:30px;width:30px}.inline-note{padding:13px;margin-top:18px;gap:8px}.inline-note p{font-size:9px}.module-title h2{font-size:25px}.module-title .eyebrow{font-size:8px}.module-title p{font-size:10px}.module-title-icon{width:45px;height:45px;flex-shrink:0}.resource-toolbar{gap:12px;padding-top:18px;padding-bottom:14px}.type-filters{gap:3px}.filter-button{padding:6px 6px;font-size:9px}.available-toggle{font-size:9px}.resource-grid,.resource-group>.resource-grid,.ready-grid{grid-template-columns:1fr}.resource-card{padding:17px 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a>span{font-size:9px}.dialog-top{padding:14px 18px}.dialog-top .eyebrow{font-size:8px}.dialog-content{padding:23px 20px}.dialog-content h2{font-size:22px}.dialog-content>p{font-size:11px}.resource-guidance{padding:15px}.resource-guidance p{font-size:10px}.dialog-actions{flex-direction:column}.dialog-actions .button{width:100%;font-size:11px}.pdf-preview{height:330px}.empty-state{padding:25px 10px;min-height:250px}.empty-state h2,.empty-state h3{font-size:18px}.empty-state p{font-size:11px}.empty-state h1{font-size:24px}}
@media(max-width:380px){.site-header{padding-left:16px;padding-right:16px;column-gap:10px}.brand{font-size:14px}.brand small{font-size:5px}.global-search{width:137px}.page{padding-left:16px;padding-right:16px}.hero-copy h1{font-size:34px}.book-cover{height:202px;padding:14px}.cover-title em{font-size:25px}.cover-number{font-size:90px}.book-card-foot>span:last-child{display:none}.continue-strip>div>a{font-size:9px}.hero-copy .eyebrow{font-size:7px}.overview-head h2{font-size:18px}.overview-count{display:none}.lesson-heading h1{font-size:35px}.site-footer{margin:0 16px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* Secondary text still carries teaching and availability information. */
.resource-description,.resource-guidance p,.dialog-content>p,.guide-grid p,.guide-import p,.inline-note p,.empty-state p{color:#5e7057;font-size:11px}
.is-pending,.subtle,.resource-meta,.resource-count-line,.resource-bottom>span:last-child,.resource-id,.module-card p,.module-card-bottom,.module-title p,.overview-head p,.lesson-heading p,.collection-heading>p,.lesson-card p,.book-card-info p,.book-card-foot,.library-note p,.hero-copy p,.hero-footnote,.site-footer,.continue-meta,.resource-group summary small,.filter-button,.available-toggle{color:#66735e}
.book-card-info p,.book-card-foot{font-size:10px}
.module-card-bottom small{font-size:10px}
.sidebar-foot,.lesson-pagination,.breadcrumbs{color:#6b775f}
main:focus{outline:none}
.load-more{display:flex;justify-content:center;margin:28px 0}
.pdf-loading-note{font-size:11px;line-height:1.8;color:#63745b;padding:10px 16px;background:#f0f4e9}
.memory-thumbnails{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));max-height:340px;overflow:auto;gap:10px}.memory-thumbnails a{min-width:0;padding:5px!important;display:flex;flex-direction:column;gap:6px;text-align:center}.memory-thumbnails img{width:100%;height:84px;object-fit:contain;background:#e1e6d8;border-radius:3px}.memory-thumbnails a[aria-current]{outline:2px solid #c65e3c;outline-offset:0}.memory-thumbnails a span{font-size:10px;line-height:1.5}.teaching-page .lesson-heading h1{overflow-wrap:anywhere;line-height:1.3}
.teaching-image-link{display:block;background:#eeefe7;min-height:240px}.teaching-image{min-height:240px}
.path-heading{font-size:17px;margin:25px 0 16px;font-weight:550}.path-heading small{margin-left:10px;color:#728568}.path-tile{position:relative;min-width:0}.path-tile .module-card{height:100%}.module-help{position:absolute;right:12px;top:47px;width:24px;height:24px;border-radius:50%;border:1px solid #cbd5c0;background:#fffefa;color:#57704b}.vocab-shortcuts{position:relative;display:flex;flex-wrap:wrap;gap:5px;margin-top:-58px;padding:0 12px 10px}.vocab-shortcuts a{font-size:10px;background:#e4ecda;padding:7px;border-radius:4px}.path-tile:has(.vocab-shortcuts) .module-card{padding-bottom:75px}.teaching-top{display:flex;align-items:center;gap:15px;flex-wrap:wrap;margin-bottom:20px}.teaching-top>a{font-size:11px;color:#667b5b}.teaching-top h2{font-size:19px;font-weight:550;flex:1;line-height:1.6}.teaching-top .help-link{margin:0;flex-shrink:0}.teaching-workspace{border:1px solid var(--line);border-radius:10px;background:var(--white);overflow:hidden}.teaching-stage{min-width:0}.teaching-tabs{display:flex;gap:8px;flex-wrap:wrap;background:#edf1e6;border-top:1px solid var(--line);padding:14px}.teaching-tabs a{padding:10px 13px;border:1px solid #d5dfca;background:#fbfcf6;border-radius:6px;font-size:11px;line-height:1.6}.teaching-tabs a[aria-current]{background:var(--green);color:white;border-color:var(--green)}.child-tabs{border-top:0;border-bottom:1px solid var(--line);background:#f5f6ee}.is-reading{display:grid;grid-template-columns:190px minmax(0,1fr)}.reader-list{border-top:0;border-right:1px solid var(--line);flex-direction:column;flex-wrap:nowrap;max-height:740px;overflow:auto;align-self:start}.reader-list a{overflow-wrap:anywhere;font-size:11px}.teaching-file{min-width:0}.teaching-file>header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;gap:12px;border-bottom:1px solid var(--line)}.teaching-file>header h3{font-size:12px;font-weight:550;line-height:1.6}.teaching-file>header>a{font-size:11px;white-space:nowrap;color:#4b6940}.teaching-file>header .icon{width:13px;height:13px;margin-left:5px}.teaching-pdf{display:block;width:100%;height:560px;border:0;background:#f0f0e9}.teaching-media{display:block;width:100%;max-height:520px;margin:0;min-height:54px}.teaching-file:has(audio){padding-bottom:12px;background:#f3f6ed}.teaching-file audio{width:calc(100% - 24px);margin:12px}.teaching-file video{background:#14201a;min-height:260px}.teaching-image{display:block;width:100%;max-height:570px;object-fit:contain;background:#eeefe7}.ppt-stage{min-height:340px;padding:45px 20px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:20px;background:linear-gradient(130deg,#f2f2e4,#fdfbf5)}.ppt-stage>.icon{width:43px;height:43px;color:#b97d54}.ppt-stage h3{font-size:23px;text-align:center;line-height:1.5}.ppt-stage p{font-size:11px;line-height:1.8;text-align:center;color:#6e7b64}.image-navigation{display:flex;align-items:center;justify-content:space-between;padding:16px;font-size:11px;gap:8px}.image-navigation>span{color:#79866f}#lesson-picker{width:100%;padding:10px;border:1px solid #ced8c3;border-radius:5px;background:#f8faf3;color:var(--green);margin-bottom:18px}.teaching-page .lesson-heading{margin-bottom:25px}
@media(max-width:760px){.is-reading{grid-template-columns:1fr}.reader-list{max-height:175px;border-right:0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.reader-list a{font-size:10px;padding:8px}.teaching-tabs{gap:6px;padding:10px}.teaching-tabs a{font-size:10px;padding:8px 10px}.teaching-top{gap:10px}.teaching-top h2{font-size:16px;flex-basis:75%}.teaching-pdf{height:440px}.teaching-file>header{padding:10px;gap:6px}.teaching-file>header h3{font-size:11px}.teaching-file>header>a{font-size:10px}.ppt-stage{min-height:300px;padding:28px 15px}.ppt-stage h3{font-size:20px}.image-navigation{font-size:9px;padding:12px}.vocab-shortcuts{margin-top:-80px}.path-tile:has(.vocab-shortcuts) .module-card{padding-bottom:95px}.teaching-page .sidebar-title{display:none}#lesson-picker{margin-bottom:12px;width:135px;padding:7px}.teaching-page .lesson-heading h1{font-size:37px}.teaching-page .lesson-heading .button{font-size:9px}}
@media(max-width:760px){.top-nav{grid-column:1/-1;padding-right:32px;gap:22px}}
.teaching-image-wrap{display:flex;flex-direction:column;background:#eeefe7}
.memory-audio-bar{background:#eef3e8;border-top:1px solid var(--line);padding:12px 18px;display:flex;flex-direction:column;gap:8px}
.memory-audio-header{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:11px;color:#55694c}
.audio-tag{display:inline-flex;align-items:center;gap:6px;font-weight:600;color:var(--green)}
.audio-tag .icon{width:15px;height:15px}
.memory-autoplay-label{display:inline-flex;align-items:center;gap:6px;cursor:pointer;margin-left:auto;color:#617257}
.memory-autoplay-label input{accent-color:var(--green);cursor:pointer}
.memory-replay-btn{background:#dfe8d4;color:var(--green);padding:4px 9px;border-radius:4px;font-size:11px;display:inline-flex;align-items:center;gap:4px;font-weight:550}
.memory-replay-btn:hover{background:#d2dec5}
.memory-replay-btn .icon{width:12px;height:12px}
.keyboard-tip{font-size:10px;color:#7e8b75;margin-left:4px}
.memory-sentence-audio{width:100%;height:36px;border-radius:6px;outline:none}
.sound-badge{display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;border-radius:50%;background:#e5edd9;color:var(--green);margin-left:4px;vertical-align:middle}
.sound-badge .icon{width:11px;height:11px}
.combined-files:has(.teaching-file.kind-audio) .teaching-file.kind-audio{position:sticky;top:0;z-index:3;background:#f3f7ee;border-bottom:2px solid #d5dfca;box-shadow:0 4px 12px rgba(34,60,52,0.04)}
dialog.guide-dialog{width:min(720px,calc(100vw - 32px));background:#fffdfa;padding:0;border:1px solid #d5dfca;border-radius:12px}
.guide-dialog-content{padding:24px;display:flex;justify-content:center;background:#f9faf6}
.guide-image{max-width:100%;max-height:75vh;object-fit:contain;border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,0.08)}
@media(max-width:760px){.keyboard-tip{display:none}.memory-audio-bar{padding:10px 12px}}

/* ==========================================================================
   Activity Color System (教学环节专属色彩系统)
   ========================================================================== */
.category-pill{font-size:10px;font-weight:700;letter-spacing:0.5px;padding:3px 8px;border-radius:12px;display:inline-flex;align-items:center;line-height:1.4}
.activity-badge{font-size:10px;font-weight:700;padding:3px 9px;border-radius:4px;display:inline-block;letter-spacing:0.4px;flex-shrink:0}
.file-title-wrap{display:flex;align-items:center;gap:10px;flex-wrap:wrap;min-width:0}
.file-title-wrap h3{font-size:13px;font-weight:600}

/* Theme: 快速记忆 (翡翠绿) */
.path-tile.theme-memory .module-card{border-left:4px solid #059669;background:#fbfdfb}
.category-pill.theme-memory{background:#d1fae5;color:#065f46;border:1px solid #a7f3d0}
.activity-badge.theme-memory{background:#d1fae5;color:#065f46;border:1px solid #a7f3d0}
.tab-dot.theme-memory{background:#059669}
.tab-item.theme-memory[aria-current]{background:#059669!important;border-color:#059669!important;color:white!important}

/* Theme: 课文精讲 (经典宝蓝) */
.path-tile.theme-ppt .module-card{border-left:4px solid #2563eb;background:#fafbff}
.category-pill.theme-ppt{background:#dbeafe;color:#1e40af;border:1px solid #bfdbfe}
.activity-badge.theme-ppt{background:#dbeafe;color:#1e40af;border:1px solid #bfdbfe}
.tab-dot.theme-ppt{background:#2563eb}
.tab-item.theme-ppt[aria-current]{background:#2563eb!important;border-color:#2563eb!important;color:white!important}
.download-ppt-btn{background:#2563eb!important;border-color:#1d4ed8!important}
.download-ppt-btn:hover{background:#1d4ed8!important}

/* Theme: 动漫与视听 (活力青蓝) */
.path-tile.theme-video .module-card{border-left:4px solid #0891b2;background:#faffff}
.category-pill.theme-video{background:#cffafe;color:#155e75;border:1px solid #a5f3fc}
.activity-badge.theme-video{background:#cffafe;color:#155e75;border:1px solid #a5f3fc}
.tab-dot.theme-video{background:#0891b2}
.tab-item.theme-video[aria-current]{background:#0891b2!important;border-color:#0891b2!important;color:white!important}

/* Theme: 词汇专练 (醒目紫罗兰) */
.path-tile.theme-vocab .module-card{border-left:4px solid #7c3aed;background:#fbfaff}
.category-pill.theme-vocab{background:#ede9fe;color:#5b21b6;border:1px solid #ddd6fe}
.activity-badge.theme-vocab{background:#ede9fe;color:#5b21b6;border:1px solid #ddd6fe}
.tab-dot.theme-vocab{background:#7c3aed}
.tab-item.theme-vocab[aria-current]{background:#7c3aed!important;border-color:#7c3aed!important;color:white!important}
.vocab-shortcuts a{font-size:10px;background:#ede9fe;color:#5b21b6;border:1px solid #ddd6fe;padding:6px 9px;border-radius:4px;font-weight:600;transition:background .15s}
.vocab-shortcuts a:hover{background:#ddd6fe}

/* Theme: 语法体系 (琥珀橙) */
.path-tile.theme-grammar .module-card{border-left:4px solid #ea580c;background:#fffdfa}
.category-pill.theme-grammar{background:#ffedd5;color:#9a3412;border:1px solid #fed7aa}
.activity-badge.theme-grammar{background:#ffedd5;color:#9a3412;border:1px solid #fed7aa}
.tab-dot.theme-grammar{background:#ea580c}
.tab-item.theme-grammar[aria-current]{background:#ea580c!important;border-color:#ea580c!important;color:white!important}

/* Theme: 讲义测验 (茜红/玫红) */
.path-tile.theme-quiz .module-card{border-left:4px solid #e11d48;background:#fffafb}
.category-pill.theme-quiz{background:#ffe4e6;color:#9f1239;border:1px solid #fecdd3}
.activity-badge.theme-quiz{background:#ffe4e6;color:#9f1239;border:1px solid #fecdd3}
.tab-dot.theme-quiz{background:#e11d48}
.tab-item.theme-quiz[aria-current]{background:#e11d48!important;border-color:#e11d48!important;color:white!important}

/* Theme: 原文听力 (深海绀蓝) */
.path-tile.theme-audio .module-card{border-left:4px solid #1e40af;background:#f9fbff}
.category-pill.theme-audio{background:#e0e7ff;color:#3730a3;border:1px solid #c7d2fe}
.activity-badge.theme-audio{background:#e0e7ff;color:#3730a3;border:1px solid #c7d2fe}
.tab-dot.theme-audio{background:#1e40af}
.tab-item.theme-audio[aria-current]{background:#1e40af!important;border-color:#1e40af!important;color:white!important}

/* Theme: 阅读专栏 (松石绿) */
.path-tile.theme-reader .module-card{border-left:4px solid #0d9488;background:#f8fdfc}
.category-pill.theme-reader{background:#ccfbf1;color:#115e59;border:1px solid #99f6e4}
.activity-badge.theme-reader{background:#ccfbf1;color:#115e59;border:1px solid #99f6e4}
.tab-dot.theme-reader{background:#0d9488}
.tab-item.theme-reader[aria-current]{background:#0d9488!important;border-color:#0d9488!important;color:white!important}

/* Theme: 写作实训 (湖蓝) */
.path-tile.theme-writing .module-card{border-left:4px solid #0284c7;background:#f9fcff}
.category-pill.theme-writing{background:#e0f2fe;color:#075985;border:1px solid #bae6fd}
.activity-badge.theme-writing{background:#e0f2fe;color:#075985;border:1px solid #bae6fd}
.tab-dot.theme-writing{background:#0284c7}
.tab-item.theme-writing[aria-current]{background:#0284c7!important;border-color:#0284c7!important;color:white!important}

/* Sub-navigation tabs layout */
.tab-item{display:inline-flex;align-items:center;gap:7px;font-weight:550}
.tab-dot{width:7px;height:7px;border-radius:50%;display:inline-block;flex-shrink:0}
.next-module-link{margin-left:auto;font-size:11px;color:#2563eb;font-weight:600;display:inline-flex;align-items:center;padding:8px 12px;border-radius:6px;background:#eff6ff}
.next-module-link:hover{background:#dbeafe}
.file-download-link{font-size:11px;color:#2563eb;font-weight:600;display:inline-flex;align-items:center;gap:4px;padding:4px 8px;border-radius:4px;background:#eff6ff}
.file-download-link:hover{background:#dbeafe}

/* Desktop App Action & Download Center Styles */
.ppt-btn-group{display:flex;align-items:center;gap:12px;flex-wrap:wrap;justify-content:center}
.native-open-btn{background:#059669!important;border-color:#047857!important;font-weight:700!important}
.native-open-btn:hover{background:#047857!important}
.download-cards-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin:28px 0 32px}
.download-card{background:var(--white);border:1px solid var(--line);border-radius:10px;padding:24px 20px;display:flex;flex-direction:column;min-width:0;transition:transform .2s,box-shadow .2s;box-shadow:0 2px 8px rgba(0,0,0,0.03)}
.download-card:hover{transform:translateY(-3px);box-shadow:0 12px 28px rgba(0,0,0,0.06);border-color:#b5c4ad}
.download-card.theme-mac{border-top:4px solid #059669}
.download-card.theme-win{border-top:4px solid #2563eb}
.download-card-header{margin-bottom:18px}
.download-os-badge{font-size:11px;font-weight:700;display:inline-block;padding:3px 8px;border-radius:4px;background:#eef4ea;color:#35532d;margin-bottom:10px}
.download-card.theme-win .download-os-badge{background:#ebf2ff;color:#1d4ed8}
.download-card-header h3{font-size:17px;font-weight:650;margin-bottom:6px;line-height:1.4}
.download-card-header p{font-size:11px;color:#6b7863;line-height:1.6}
.download-card-body{margin-bottom:24px}
.download-card-body ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}
.download-card-body li{font-size:11px;line-height:1.7;color:#4f5e48}
.download-card-body li strong{color:var(--ink)}
.download-card-footer{margin-top:auto;display:flex;flex-direction:column;gap:8px}
.download-client-btn{width:100%;font-size:12px;padding:12px 14px}
.download-card.theme-win .download-client-btn{background:#2563eb!important;border-color:#1d4ed8!important}
.download-card.theme-win .download-client-btn:hover{background:#1d4ed8!important}
.checksum-tag{font-family:monospace;font-size:9px;color:#7e8c75;text-align:center}
.install-guide-note{margin-top:28px}
.toast.show{display:block;background:rgba(24,38,28,0.92);color:white;padding:12px 24px;border-radius:24px;font-size:12px;font-weight:550;box-shadow:0 8px 30px rgba(0,0,0,0.25);z-index:9999;backdrop-filter:blur(6px);animation:popIn .2s ease-out}
@keyframes popIn{from{opacity:0;transform:translate(-50%,12px)}to{opacity:1;transform:translate(-50%,0)}}
@media(max-width:960px){.download-cards-grid{grid-template-columns:1fr}}