@layer reset,base,components,responsive;@layer reset{*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed}a{color:inherit;text-decoration:none}button{color:inherit}img,canvas{display:block;max-width:100%}}@layer base{:root{font-family:PingFang SC,Microsoft YaHei,system-ui,sans-serif;color:#27344a;background:#f8f7f3;font-synthesis:none;font-weight:400;--ink:#27344a;--muted:#6d7382;--purple:#7556cf;--mint:#dff1e8;--line:#e5e4ec;--paper:#fffefa}body{min-width:320px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #9474ed;outline-offset:4px}button:disabled{opacity:.38}h1,h2,h3,p{margin-top:0}p{line-height:1.8}button{border:0;background:none}a:hover{color:#7556cf}::selection{background:#e6dcff}input,textarea{user-select:text!important}.classroom-shell{user-select:none;-webkit-user-select:none}.eyebrow{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:650;letter-spacing:.14em;color:#78649b}.button{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:44px;padding:11px 18px;border:1px solid var(--line);border-radius:11px;background:#fff;line-height:1.4;font-size:14px;font-weight:550;transition:background .16s,border-color .16s}.button:hover:not(:disabled){background:#f1ebff;border-color:#c3b1eb}.button.primary{background:var(--ink);border-color:var(--ink);color:#fff}.button.primary:hover:not(:disabled){background:#44315e;border-color:#44315e}.button.small{padding:8px 12px;font-size:13px;min-height:40px}.text-button{display:inline-flex;align-items:center;gap:7px;color:var(--purple);font-size:13px;padding:6px 0}.notice{display:flex;align-items:flex-start;gap:9px;background:#fff0e8;color:#9a452c;padding:12px 16px;border-radius:9px;font-size:13px;line-height:1.7}.notice svg{flex:none;margin-top:1px}.brand{display:inline-flex;align-items:center;gap:8px;flex-shrink:0;color:#27344a}.brand img{width:37px;height:37px;object-fit:contain}.brand strong{font-size:26px;font-weight:800;letter-spacing:-1.5px;line-height:1}.brand strong span{font-weight:500}.brand:hover{color:#27344a}.print-notice{display:none}}@layer components{.personal-veil{position:fixed;inset:0;z-index:40;pointer-events:none;overflow:hidden;display:grid;grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(7,1fr);opacity:.09;color:#3e3154}.personal-veil>span{display:flex;flex-direction:column;align-items:center;justify-content:center;transform:rotate(-18deg);font:13px system-ui,sans-serif;white-space:nowrap}.personal-veil small{font-size:9px;margin-top:4px;letter-spacing:.1em}.signin-page{min-height:100dvh;background:radial-gradient(ellipse at 4% 80%,#e9f4ed 0,transparent 46%),radial-gradient(ellipse at 91% 17%,#ece5fa 0,transparent 43%),#faf8f2;display:flex;flex-direction:column}.signin-page>header{display:flex;align-items:center;justify-content:space-between;padding:30px 5vw}.private-badge{display:flex;gap:6px;align-items:center;font-size:12px;color:#747183;background:#fff9;padding:8px 12px;border:1px solid #e6dff1;border-radius:99px}.signin-layout{display:grid;grid-template-columns:1.25fr 1fr;gap:8vw;align-items:center;width:min(1140px,90%);margin:auto;padding:40px 0 68px}.signin-intro h1{font-size:clamp(36px,4.5vw,64px);line-height:1.45;letter-spacing:-.04em;margin:20px 0}.title-dot{color:#a991d7}.signin-intro>p{color:#717584;font-size:17px;line-height:1.95}.learning-path{display:flex;align-items:center;gap:15px;margin-top:38px}.learning-path>div{display:flex;align-items:center;gap:10px;padding:14px 18px;background:#fffd;border:1px solid #e6e4eb;border-radius:14px;font-size:14px;font-weight:600}.learning-path>div:nth-of-type(1) svg{color:#8061c4}.learning-path>div:nth-of-type(2) svg{color:#468e7a}.learning-path>div:nth-of-type(3) svg{color:#c17659}.learning-path i{width:12px;height:1px;background:#c6bed3}.intro-caption{display:flex;gap:8px;align-items:center;color:#81818d;font-size:12px;margin-top:30px}.intro-caption svg{color:#a389d2}.signin-card{background:#fffefbea;border:1px solid #e9e4ec;border-radius:25px;padding:38px;box-shadow:0 20px 60px #38314808}.signin-icon{width:56px;height:56px;background:#ece5fa;border-radius:17px;color:#8062b5;display:grid;place-items:center;margin-bottom:25px}.signin-card h2{font-size:26px;margin-bottom:7px;letter-spacing:-.025em}.signin-card>p{font-size:13px;color:var(--muted)}.field{display:flex;flex-direction:column;gap:8px;font-size:13px;font-weight:600;margin-top:21px}.field input{width:100%;height:48px;border:1px solid #dddfe7;border-radius:10px;background:#fff;padding:10px 13px;font-size:15px;color:var(--ink);min-width:0}.field input::placeholder{color:#a5a4ac;font-size:13px}.password-field{position:relative;display:block}.password-field input{padding-right:48px}.password-field button{position:absolute;right:3px;top:3px;width:42px;height:42px;display:grid;place-items:center;color:#8b8799}.signin-submit{width:100%;margin-top:26px;justify-content:space-between;min-height:48px}.signin-card .notice{margin-top:16px}.signin-card .signin-help{font-size:12px;line-height:1.9;text-align:center;margin:24px 0 20px}.protection-caption{display:flex;align-items:center;justify-content:center;gap:6px;border-top:1px solid #eeebf1;padding-top:18px;color:#8a8598;font-size:11px}.signin-page>footer{text-align:center;color:#99949d;font-size:11px;padding:20px}.account-label{margin-top:20px;padding:12px;background:#f4f0fa;border-radius:9px;font-size:13px;color:#776388}.initial-loading{display:flex;min-height:50vh;align-items:center;justify-content:center;gap:20px;flex-direction:column;color:#8b8099;font-size:14px}.loading-orbit{width:25px;height:25px;border:2px solid #e6dfee;border-top-color:#8869c4;border-radius:50%;animation:rotate 1s linear infinite}.connection-screen{min-height:100dvh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:30px;text-align:center;gap:15px}.connection-screen>.brand{margin-bottom:36px}.connection-screen>svg{color:#9b7cca}.connection-screen h1{font-size:26px;margin:10px 0 0}.connection-screen p{margin:0;color:#787382;font-size:14px}.classroom-header{height:78px;display:flex;align-items:center;gap:25px;padding:0 4.2vw;background:#fffefbcf;border-bottom:1px solid #e8e5ed}.classroom-name{border-left:1px solid #dedbe6;padding-left:25px;font-size:14px;letter-spacing:.06em;color:#7f758f}.teacher-account{margin-left:auto;display:flex;align-items:center;gap:20px}.teacher-account>span{display:flex;align-items:center;gap:7px;color:#83768d;font-size:12px}.teacher-account>span svg{color:#a38ec4}.teacher-account button{display:flex;gap:6px;align-items:center;padding:10px;color:#797183;font-size:12px}.catalog{max-width:1340px;width:91.6%;margin:0 auto;padding:58px 0 42px}.catalog-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:29px;gap:25px}.catalog-heading h1{font-size:clamp(27px,3vw,42px);letter-spacing:-.035em;margin:11px 0}.catalog-heading p{color:#85808d;font-size:14px;margin:0}.catalog-summary{display:flex;align-items:center;gap:22px;color:#8d7bac;flex-shrink:0}.catalog-summary>span{font-family:system-ui,sans-serif;font-size:35px;font-weight:500;display:flex;flex-direction:column}.catalog-summary>span>span{font-family:inherit;font-size:11px;margin-top:4px;font-weight:400;color:#91869f}.catalog-summary b{font-size:15px;font-weight:400;color:#baaaca}.catalog-strip{display:flex;align-items:center;gap:8px;background:#eee8f5;border:1px solid #e2d8ed;border-radius:10px;color:#81708f;padding:12px 16px;font-size:11px;margin-bottom:28px}.large-screen-note{margin-left:auto;display:flex;align-items:center;gap:6px}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.course-card{border:1px solid #e5e2eb;border-radius:15px;overflow:hidden;background:#fff;text-align:left;padding:0;display:block;transition:transform .18s,box-shadow .18s}.course-card:hover{transform:translateY(-4px);box-shadow:0 12px 30px #4432510d}.course-cover{position:relative;border-bottom:1px solid #eeebf2}.course-cover .secure-slide{border:0;border-radius:0}.course-index{position:absolute;left:15px;top:13px;font-size:10px;font-weight:600;letter-spacing:.08em;padding:6px 9px;background:#ffffffe0;backdrop-filter:blur(8px);border-radius:6px;border:1px solid #ffffff;color:#766285}.course-info{padding:22px}.course-info h2{font-size:18px;letter-spacing:-.025em;margin:0 0 10px;font-weight:650}.course-info p{font-size:12px;color:#89808f;line-height:1.8;margin:0 0 22px;min-height:43px}.course-info>div{display:flex;align-items:center;gap:16px;font-size:11px;color:#948b9b}.course-info>div>span{display:flex;align-items:center;gap:5px}.course-arrow{margin-left:auto;color:#8b72b0}.catalog-bottom{display:flex;align-items:center;gap:17px;padding:28px;margin-top:36px;background:#eaf2eb;border:1px solid #dce8df;border-radius:13px}.catalog-bottom>svg{color:#648c79;flex-shrink:0}.catalog-bottom p{font-size:12px;color:#809084;margin:0;line-height:1.8}.catalog-bottom strong{font-size:14px;font-weight:600;color:#4d6b5a}.catalog-bottom a{margin-left:auto;font-size:12px;border-color:#d9e3d9;white-space:nowrap}.classroom-footer{display:flex;justify-content:space-between;padding:26px 4.2vw;border-top:1px solid #e5e2eb;font-size:10px;color:#a198a6}.viewer{padding:22px 3vw 26px;min-height:calc(100dvh - 78px);background:#f7f6f3}.lesson-heading{display:flex;align-items:center;gap:24px;margin-bottom:20px}.lesson-heading>div>span{font-size:10px;color:#9a8ca6;letter-spacing:.05em}.lesson-heading h1{font-size:19px;letter-spacing:-.02em;margin:4px 0 0;font-weight:600}.grade-picker{margin-left:auto;display:flex;align-items:center;gap:9px;font-size:11px;color:#93869f}.grade-picker select{background:#fff;border:1px solid #e1dbea;border-radius:8px;padding:8px 11px;color:#756286;font-size:12px;min-height:40px}.presentation-area{display:flex;gap:24px;align-items:flex-start;max-width:1660px;margin:auto}.stage-column{min-width:0;flex:1;position:relative}.stage-topline{display:flex;align-items:center;margin-bottom:12px;gap:13px}.activity-chip{display:inline-flex;border-radius:7px;padding:6px 11px;font-size:10px;background:#eae5f6;color:#886fad;letter-spacing:.04em}.type-practice{background:#e0eee7;color:#588574}.type-quiz{background:#f9ece0;color:#ae8060}.type-break{background:#e2edf5;color:#6c8b9b}.type-showcase{background:#f6e4ec;color:#a76a8b}.page-counter{font-family:system-ui,sans-serif;font-size:11px;color:#a293ad}.page-counter i{font-style:normal;margin:0 5px;color:#c5bacb}.class-clock{display:flex;align-items:center;gap:8px;margin-left:auto;color:#9a8ca5;font-family:system-ui,sans-serif;font-size:12px;font-variant-numeric:tabular-nums}.class-clock button{width:30px;height:30px;display:grid;place-items:center;border:1px solid #e6dfee;border-radius:7px;background:#fffc}.class-clock.finished{color:#bd7d58}.secure-slide{width:100%;aspect-ratio:16/9;position:relative;overflow:hidden;background:#fcfbf7;border-radius:11px;border:1px solid #ded9e4;box-shadow:0 8px 28px #48324b06;display:flex;align-items:center;justify-content:center}.secure-slide canvas{width:100%;height:100%;object-fit:contain}.secure-slide.compact{box-shadow:none}.slide-status{display:flex;align-items:center;justify-content:center;gap:13px;flex-direction:column;min-height:120px;font-size:13px;color:#a193ab}.slide-status p{margin:0}.slide-status>svg{color:#bda8c9}.slide-progress{height:2px;background:#e8e2ed;margin:15px 0 0;overflow:hidden;border-radius:4px}.slide-progress>span{display:block;height:100%;background:linear-gradient(90deg,#9274c6,#9fc7bd);transition:width .2s}.presentation-toolbar{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:13px 0}.page-actions{display:flex;align-items:center;gap:13px}.page-actions>span{font-size:11px;color:#a193ab;font-variant-numeric:tabular-nums}.icon-button{width:44px;padding:10px}.next-button{font-size:12px;padding:10px 16px}.view-actions{display:flex;align-items:center;gap:6px}.view-actions>button{display:flex;align-items:center;gap:6px;font-size:11px;color:#8b7a99;padding:10px;border-radius:8px;min-height:44px}.view-actions>button:hover,.view-actions>button.active{color:#7857a7;background:#eee6f5}.viewer-footnote{display:flex;align-items:center;justify-content:space-between;gap:15px;color:#b0a4b9;font-size:9px;padding:7px 0}.viewer-footnote>span{display:flex;align-items:center;gap:5px}.teacher-notes{flex:0 0 340px;background:#fffefb;border:1px solid #e4ddeb;border-radius:13px;padding:23px;max-height:calc(100dvh - 205px);overflow:auto;scrollbar-width:thin}.teacher-notes h2{font-size:19px;line-height:1.6;margin:13px 0 6px}.notes-meta{font-size:10px!important;color:#a092ae!important}.teacher-notes h3{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:650;margin:23px 0 9px;color:#7b608f}.teacher-notes p{font-size:12px;line-height:1.9;color:#817589;margin-bottom:0}.task-box{padding:15px;border-radius:9px;background:#eaf2ec;border:1px solid #dce9df;margin-top:20px}.task-box h3{margin-top:0;color:#5a846e}.task-box p{color:#6f8576}.question-box{border-top:1px solid #eee8f1;margin-top:22px}.question-box h3{color:#a27d60}.reference-answer{background:#f5f0fa;border-radius:8px;padding:12px;margin-top:8px!important}.platform-links{border-top:1px solid #eee8f1;margin-top:22px}.platform-links .button{margin:12px 0 5px;width:100%}.platform-links .text-button{font-size:11px}.slide-outline{border:1px solid #e0d6ea;padding:8px;background:#fffefb;border-radius:11px;box-shadow:0 15px 45px #57416b13;display:grid;grid-template-columns:1fr 1fr;gap:2px;margin:3px 0 14px}.slide-outline button{display:flex;align-items:center;gap:10px;min-height:44px;padding:9px 12px;font-size:11px;text-align:left;border-radius:7px;color:#8e7d9a}.slide-outline button>span{font-size:9px;color:#b2a2bc}.slide-outline button small{margin-left:auto;white-space:nowrap;font-size:9px;color:#b4a9be}.slide-outline button:hover,.slide-outline button[aria-current]{background:#eee7f7;color:#765394}.reading-text{padding:28px 20px 10px;max-width:760px;margin:auto}.reading-text h2{font-size:26px;line-height:1.6;margin:12px 0 20px}.reading-text ul{padding-left:22px;font-size:16px;line-height:2.2;color:#766b82}.reading-text .task-box{font-size:14px;line-height:1.9}.reading-text .task-box p{margin:6px 0 0}.toast{position:fixed;z-index:100;left:50%;bottom:25px;transform:translate(-50%);background:#2d263bef;color:#fff;padding:13px 20px;border-radius:99px;box-shadow:0 8px 30px #0002;display:flex;align-items:center;gap:8px;font-size:12px;max-width:90vw;white-space:normal}.viewer:fullscreen{height:100dvh;overflow:auto;padding:18px 3vw;background:#f7f6f3}.viewer:fullscreen .lesson-heading{display:none}.viewer:fullscreen .presentation-area{height:100%;max-width:none}.viewer:fullscreen .stage-column{height:100%;display:flex;flex-direction:column;align-items:stretch}.viewer:fullscreen .secure-slide{flex:1;min-height:0;aspect-ratio:auto;background:#f0ece5}.viewer:fullscreen .secure-slide canvas{max-width:100%;max-height:100%;object-fit:contain}.viewer:fullscreen .stage-topline{flex-shrink:0}.viewer:fullscreen .presentation-toolbar{flex-shrink:0;padding:12px 0 0}.viewer:fullscreen .viewer-footnote{display:none}.viewer:fullscreen .slide-progress{margin-top:10px;flex-shrink:0}.viewer:fullscreen .teacher-notes{max-height:100%;height:100%}.viewer:fullscreen .slide-outline{position:absolute;z-index:8;bottom:70px;right:0;width:min(680px,100%);max-height:70vh;overflow:auto}.viewer:fullscreen .reading-text{max-height:40vh;overflow:auto;flex-shrink:0;padding:10px 18px}@keyframes rotate{to{transform:rotate(360deg)}}}@layer responsive{@media(min-width:851px){.viewer:not(:fullscreen) .presentation-area{max-width:1480px}.viewer:not(:fullscreen) .stage-column:not(.reading-mode) .secure-slide{height:52.875vw;max-height:calc(100dvh - 340px);min-height:200px;aspect-ratio:auto}.viewer:not(:fullscreen) .with-notes .stage-column:not(.reading-mode) .secure-slide{height:calc((94vw - 364px)*.5625)}.viewer:not(:fullscreen) .stage-column:not(.reading-mode) canvas{width:100%;height:100%;object-fit:contain}}@media(max-width:1100px){.learning-path{gap:9px}.learning-path>div{padding:12px 10px;font-size:12px;gap:7px}.learning-path svg{width:22px}.learning-path i{width:5px}.signin-layout{gap:5vw}.signin-card{padding:30px}.course-grid{gap:18px}.course-info{padding:18px}.course-info h2{font-size:16px}.teacher-notes{flex-basis:300px}.view-actions{gap:0}.view-actions>button{padding:9px 8px}.view-actions>button>span{display:none}.teacher-notes{padding:18px}.classroom-header{height:70px}.viewer{min-height:calc(100dvh - 70px)}}@media(max-width:850px){.signin-layout{grid-template-columns:1fr;max-width:520px;gap:32px;padding:25px 0 35px}.signin-intro h1{font-size:40px;line-height:1.4;margin:15px 0}.signin-intro>p{font-size:14px}.learning-path,.intro-caption{display:none}.signin-card{padding:28px}.signin-icon{margin-bottom:18px}.signin-page>header{padding:22px 5vw}.catalog{padding-top:35px}.catalog-heading h1{font-size:30px}.catalog-summary{gap:13px}.catalog-summary>span{font-size:26px}.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.large-screen-note{display:none}.catalog-bottom{padding:20px;flex-wrap:wrap}.catalog-bottom a{margin-left:40px}.presentation-area.with-notes{flex-direction:column}.teacher-notes{width:100%;flex-basis:auto;max-height:none}.viewer:fullscreen .teacher-notes{max-height:35vh;overflow:auto;flex-shrink:0}.viewer:fullscreen .presentation-area.with-notes .stage-column{min-height:55vh;width:100%}.classroom-footer{flex-direction:column;gap:8px}.lesson-heading{gap:12px}.lesson-heading h1{font-size:16px}.grade-picker{font-size:0;gap:0}}@media(max-width:600px){.classroom-header{padding:0 18px;height:65px;gap:14px}.brand img{width:31px;height:31px}.brand strong{font-size:23px}.classroom-name{font-size:11px;padding-left:14px}.teacher-account{gap:3px}.teacher-account>span{display:none}.teacher-account button{font-size:10px;gap:4px}.catalog{width:auto;padding:30px 18px}.catalog-heading{align-items:flex-start;margin-bottom:22px}.catalog-heading .eyebrow{font-size:10px}.catalog-heading h1{font-size:27px;line-height:1.5;margin:10px 0}.catalog-heading p{font-size:12px;line-height:1.8}.catalog-summary{display:none}.catalog-strip{font-size:10px;align-items:flex-start;padding:12px;line-height:1.8;margin-bottom:20px}.catalog-strip svg{flex:none;margin-top:1px}.course-grid{gap:15px}.course-info{padding:15px}.course-info h2{font-size:14px;line-height:1.6;margin-bottom:7px}.course-info p{font-size:10px;line-height:1.8;margin-bottom:15px;min-height:54px}.course-info>div{gap:9px;font-size:9px}.course-info>div svg{width:13px}.course-arrow{display:none}.course-index{font-size:8px;top:7px;left:7px;padding:4px 6px}.course-card{border-radius:11px}.catalog-bottom{margin-top:25px;padding:18px;gap:12px}.catalog-bottom p{font-size:10px}.catalog-bottom strong{font-size:12px}.catalog-bottom a{margin-left:0;width:100%;font-size:11px}.classroom-footer{padding:22px 18px;font-size:9px;line-height:1.8}.viewer{padding:15px 14px 23px;min-height:calc(100dvh - 65px)}.lesson-heading{flex-wrap:wrap;gap:13px;margin-bottom:15px}.lesson-heading>.button{padding:7px 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11px;gap:5px}.view-actions{margin-left:auto}.view-actions>button{padding:8px;min-height:38px}.view-actions>button>svg{width:19px}.viewer-footnote{font-size:8px;flex-wrap:wrap;gap:7px}.viewer-footnote>span:last-child{display:none}.reading-text{padding:23px 7px 8px}.reading-text h2{font-size:24px;line-height:1.55;margin:12px 0 15px}.reading-text ul{font-size:15px;line-height:2.1;padding-left:20px}.reading-text .eyebrow{font-size:10px}.reading-text .task-box{font-size:13px}.slide-outline{grid-template-columns:1fr;gap:1px}.slide-outline button{font-size:11px}.teacher-notes{padding:20px}.teacher-notes p{font-size:13px;line-height:1.95}.teacher-notes h3{font-size:13px}.viewer:fullscreen{padding:10px 12px}.viewer:fullscreen .stage-topline{margin-bottom:7px}.viewer:fullscreen .presentation-toolbar{padding-top:8px}.viewer:fullscreen .slide-outline{bottom:50px;max-height:65vh}.viewer:fullscreen .secure-slide{border-radius:6px}.private-badge{font-size:10px;padding:7px 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