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.mobile-menu{display:none;position:relative}.mobile-menu summary{min-height:44px;color:var(--dv-ink);cursor:pointer;border:1px solid #cfd9e8;border-radius:12px;align-items:center;gap:8px;padding:0 12px;font-weight:800;list-style:none;display:flex}.mobile-menu summary::-webkit-details-marker{display:none}.mobile-menu-icon{gap:4px;width:19px;display:grid}.mobile-menu-icon i{background:currentColor;border-radius:2px;height:2px}.mobile-menu nav{border:1px solid var(--dv-line);background:#fff;border-radius:16px;width:min(280px,100vw - 24px);padding:10px;position:absolute;top:52px;right:0;box-shadow:0 20px 45px #10203b2e;display:grid!important}.mobile-menu nav a{border-radius:10px;min-height:44px;padding:12px}.mobile-menu nav a:hover{background:#eff5ff}.mobile-menu .mobile-register{color:#fff;background:var(--dv-blue)}.dv-public-page{width:min(1180px,100% - 40px);padding:44px 0 92px}.dv-public-hero{background:#f1f7fb;border:1px solid #dce7ef;border-radius:28px;padding:clamp(38px,7vw,76px)}.dv-public-hero h1{max-width:820px;margin:12px 0 16px;font-size:clamp(2.5rem,5vw,4.35rem)}.dv-public-hero p{max-width:720px;margin:0;font-size:1.05rem}.dv-public-section{margin-top:72px}.dv-public-section>header{max-width:680px;margin-bottom:26px}.dv-public-section>header h2{margin:7px 0 6px;font-size:clamp(1.8rem,3vw,2.5rem)}.dv-public-section>header p{margin:0}.dv-public-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;display:grid}.dv-public-card{border:1px solid var(--dv-line);min-height:180px;transition:border-color var(--dv-fast),box-shadow var(--dv-fast),transform var(--dv-fast);background:#fff;border-radius:18px;flex-direction:column;gap:8px;padding:26px;text-decoration:none;display:flex}.dv-public-card:before{width:42px;height:42px;color:var(--dv-blue);content:"→";background:#eaf1ff;border-radius:12px;place-items:center;margin-bottom:12px;font-weight:900;display:grid}.dv-public-card strong{font-size:1.08rem}.dv-public-card span{color:var(--dv-muted);line-height:1.55}.dv-public-card:hover{box-shadow:var(--dv-shadow);border-color:#9db8e8;transform:translateY(-2px)}.hub-page,.lesson-page,.tool-page{max-width:1180px}body:not(:has(.dv-teacher-shell)) main:not(.home-v2):not(.dv-public-page):not(.auth-page):not(.teacher-main):not(.student-workspace-main){max-width:1180px}.hub-page>h1,.lesson-page>article>h1,.tool-page>article>h1{max-width:850px}.lesson-page>article,.tool-page>article,.quiz-player,.exam-player,.tutor-panel{border-radius:var(--dv-r-xl)}.curriculum-cluster{border:1px solid var(--dv-line);background:#fff;border-radius:20px;padding:24px}.curriculum-cluster>h2{margin-top:0}.breadcrumbs ol{margin-bottom:22px}.card,.quiz-question,.tool-panel,.editor-card{border-color:var(--dv-line);box-shadow:0 10px 28px #1e40640f}.site-footer{background:#102344;position:relative;overflow:hidden}.site-footer:after{content:"";border:38px solid #2563eb2b;border-radius:50%;width:240px;height:240px;position:absolute;bottom:-90px;right:6%}.site-footer .footer-grid,.site-footer>p{z-index:1;position:relative}@media (max-width:900px){.header-inner>nav,.header-auth{display:none!important}.mobile-menu{display:block}.dv-public-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:620px){.header-inner{align-items:center;min-height:68px;padding:8px 0}.brand-copy small{display:none}.dv-public-page{width:min(100% - 24px,600px);padding:24px 0 64px}.dv-public-hero{border-radius:20px;padding:36px 22px}.dv-public-hero h1{font-size:clamp(2.25rem,12vw,3.2rem)}.dv-public-section{margin-top:52px}.dv-public-grid{grid-template-columns:1fr}.dv-public-card{min-height:0}.curriculum-cluster{padding:16px}.site-footer{padding:42px 24px}}@media (prefers-reduced-motion:reduce){.dv-public-card{transition:none}}body .site-header{z-index:60;border-bottom:1px solid var(--dv-line);box-shadow:none;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#fffffff5;position:sticky;top:0}body .header-inner{width:min(1240px,100% - 40px);min-height:68px}body .brand-mark{background:var(--dv-blue);box-shadow:none;border-radius:10px}body .brand-copy{place-items:initial;width:auto;height:auto;color:inherit;font-weight:inherit;background:0 0;border-radius:0;display:grid}body .brand-copy strong{color:var(--dv-ink);letter-spacing:-.02em}body .brand-copy small{color:var(--dv-muted)}body .header-inner>nav{gap:4px}body .header-inner>nav a{color:#42526d;border-radius:10px;min-height:42px;padding:0 14px;font-size:.9rem;font-weight:650}body .header-inner>nav a:hover{color:var(--dv-blue);background:var(--dv-blue-soft)}body .header-login,body .header-cta{border-radius:10px;min-height:42px;padding:0 17px;font-weight:750}body .header-login{border-color:var(--dv-line);color:var(--dv-ink);background:#fff}body .header-cta{border-color:var(--dv-blue);background:var(--dv-blue);box-shadow:none}body .mobile-menu summary{border-color:var(--dv-line);background:#fff;border-radius:10px}body .mobile-menu nav{border-radius:14px;box-shadow:0 18px 45px #172c4e24}body .dv-public-page{width:min(1240px,100% - 40px)}body .dv-public-hero{border-color:var(--dv-line);background:#eef6ff;border-radius:20px}body .dv-public-card{box-shadow:none;border-radius:16px}body .dv-public-card:hover{border-color:#9cb8df;box-shadow:0 10px 26px #172c4e12}body .curriculum-cluster,body .lesson-page>article,body .tool-page>article,body .quiz-player,body .exam-player,body .tutor-panel{border-color:var(--dv-line);box-shadow:none;border-radius:16px}@media (max-width:620px){body .header-inner{width:calc(100% - 24px)}body .brand-mark{width:40px;height:40px}body .dv-public-hero{border-radius:16px}}
.dv-auth-page{grid-template-columns:1fr minmax(400px,.78fr);gap:clamp(48px,8vw,110px);width:min(1180px,100% - 40px);min-height:100vh;padding:76px 0;position:relative}.dv-auth-page:before{z-index:-1;content:"";background:#102b56;border-radius:0 32px 32px 0;position:absolute;inset:20px 48% 20px -50vw}.dv-auth-back{color:#dceafe;font-weight:750;text-decoration:none;position:absolute;top:24px;left:0}.dv-auth-page .auth-intro h1{color:#fff;max-width:650px;font-size:clamp(3rem,5vw,4.8rem)}.dv-auth-page .auth-intro>p{color:#c9d8ed}.dv-auth-page .eyebrow{color:#5eead4}.dv-auth-logo{color:#fff;background:var(--dv-blue);border-radius:17px;place-items:center;width:58px;height:58px;margin-bottom:24px;font-size:1.4rem;font-weight:900;display:grid}.dv-auth-benefits{color:#dbe7f5;gap:12px;margin-top:32px;font-weight:650;display:grid}.dv-auth-benefits span{align-items:center;gap:12px;display:flex}.dv-auth-benefits b{color:#5eead4;background:#0d94882e;border-radius:10px;place-items:center;width:34px;height:34px;font-size:.75rem;display:grid}.dv-auth-page .auth-form-side{background:#fff;border-color:#d8e3ec;border-radius:24px;padding:34px;box-shadow:0 24px 60px #102b5624}.dv-auth-page .auth-welcome strong{font-size:1.7rem}.dv-auth-page .auth-tabs,.dv-auth-page .auth-role-tabs{background:#edf2f7;border-radius:12px;grid-template-columns:1fr 1fr;padding:4px;display:grid}.dv-auth-page .auth-tabs button,.dv-auth-page .auth-role-tabs button{color:#52627a;background:0 0;border-radius:9px;min-height:42px;padding:8px}.dv-auth-page .auth-tabs button.active,.dv-auth-page .auth-role-tabs button.active{color:var(--dv-blue-dark);background:#fff;box-shadow:0 3px 10px #102b5614}.dv-auth-page .auth-role-tabs{margin-bottom:18px}.dv-auth-page .auth-card label{color:var(--dv-ink);font-size:.86rem;font-weight:750}.dv-auth-page .auth-card input{border-color:#cad7e4;min-height:48px}.dv-auth-page .auth-password{display:block;position:relative}.dv-auth-page .auth-password input{padding-right:68px}.dv-auth-page .auth-password button{min-height:38px;color:var(--dv-blue-dark);background:#edf3ff;padding:0 11px;font-size:.78rem;position:absolute;top:5px;right:5px}.dv-auth-page .auth-submit{background:var(--dv-blue);min-height:50px}.dv-auth-page .form-error{color:#a51d3b;background:#fff1f4;border:1px solid #f4c4ce;border-radius:11px;margin:0;padding:12px}@media (max-width:860px){body:has(.dv-auth-page){background:#edf5f8}.dv-auth-page{grid-template-columns:1fr;gap:28px;width:min(100% - 24px,560px);padding:70px 0 36px}.dv-auth-page:before{background:#102b56;border-radius:0;height:43%;inset:0 0 auto}.dv-auth-back{top:22px}.dv-auth-page .auth-intro h1{font-size:clamp(2.35rem,10vw,3.5rem)}.dv-auth-page .auth-intro>p{color:#c9d8ed}.dv-auth-benefits{display:none}.dv-auth-page .auth-form-side{padding:24px 18px}.dv-auth-page .auth-password-grid{grid-template-columns:1fr}}body:has(.dv-auth-page){background:#f3f7fb}body .dv-auth-page{grid-template-columns:minmax(0,.82fr) minmax(420px,.68fr);gap:72px;width:min(1120px,100% - 40px);padding:64px 0}body .dv-auth-page:before{background:#102a4f;border-radius:0 24px 24px 0;inset:20px 50% 20px -50vw}body .dv-auth-page .auth-intro h1{letter-spacing:-.045em;max-width:560px;font-size:clamp(2.65rem,4.2vw,4rem);line-height:1.05}body .dv-auth-logo{background:var(--dv-teal);border-radius:14px}body .dv-auth-page .auth-form-side{border-color:var(--dv-line);border-radius:18px;padding:30px;box-shadow:0 16px 45px #172c4e1a}body .dv-auth-page .auth-tabs,body .dv-auth-page .auth-role-tabs{border-radius:10px}body .dv-auth-page .auth-tabs button,body .dv-auth-page .auth-role-tabs button{border-radius:8px}body .dv-auth-page .auth-tabs button.active,body .dv-auth-page .auth-role-tabs button.active{color:var(--dv-blue);box-shadow:none}body .dv-auth-page .auth-card input{background:#fbfdff;border-radius:10px}body .dv-auth-page .auth-submit{background:var(--dv-blue);box-shadow:none;border-radius:10px}@media (max-width:860px){body .dv-auth-page{gap:22px;width:min(100% - 24px,540px);padding:62px 0 28px}body .dv-auth-page:before{border-radius:0;height:38%}body .dv-auth-page .auth-intro h1{font-size:clamp(2.05rem,9vw,2.8rem)}body .dv-auth-page .auth-form-side{border-radius:16px;padding:22px 16px}}
body .student-workspace{color:var(--dv-ink);background:#f4f8fb}body .student-workspace-sidebar{border-right:1px solid var(--dv-line);box-shadow:none;background:#fff}body .student-workspace-brand>span:first-child{background:var(--dv-blue);border-radius:13px}body .student-workspace-nav a{color:#42516a;border-radius:12px;min-height:46px}body .student-workspace-nav svg{flex:none}body .student-workspace-topbar{border-bottom:1px solid var(--dv-line);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#ffffffeb}body .student-workspace-main{width:100%;max-width:1440px;margin:0 auto;padding:30px}body .student-workspace-recommendation h1{color:#fff}body .student-workspace-section,body .student-workspace-rail-card{border-color:var(--dv-line);border-radius:18px;box-shadow:0 10px 28px #1e40640f}.student-mobile-nav{display:none}@media (max-width:780px){body .student-workspace-sidebar{display:none}body .student-workspace-content{width:100%}body .student-workspace-topbar{padding:14px 16px}body .student-workspace-metrics{gap:6px}body .student-workspace-metrics div{padding:8px}body .student-workspace-main{padding:18px 12px 92px}.student-mobile-nav{z-index:20;border:1px solid var(--dv-line);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#fffffff5;border-radius:18px;grid-template-columns:repeat(5,1fr);padding:6px;display:grid;position:fixed;bottom:10px;left:10px;right:10px;box-shadow:0 18px 45px #10203b33}.student-mobile-nav a{color:#5b6980;border-radius:12px;align-content:center;place-items:center;gap:3px;min-height:54px;font-size:.66rem;font-weight:750;text-decoration:none;display:grid}.student-mobile-nav a[aria-current=page]{color:var(--dv-blue-dark);background:#eaf1ff}.student-mobile-nav span{text-overflow:ellipsis;white-space:nowrap;max-width:64px;overflow:hidden}}@media (max-width:380px){.student-mobile-nav a{font-size:.6rem}}body .student-workspace{background:var(--dv-canvas)}body .student-workspace-sidebar{border-color:var(--dv-line);width:256px;padding:20px 14px}body .student-workspace-brand>span:first-child{background:var(--dv-teal);box-shadow:none;border-radius:11px}body .student-workspace-nav a{border-radius:10px;min-height:44px}body .student-workspace-nav a[aria-current=page]{color:var(--dv-blue);background:var(--dv-blue-soft)}body .student-workspace-main{max-width:1360px;padding:28px}body .student-workspace-recommendation{background:#102a4f;border-radius:16px}body .student-workspace-section,body .student-workspace-rail-card{border-color:var(--dv-line);box-shadow:none;border-radius:14px}body .student-workspace-card-icon{border-radius:12px}body .student-workspace-progress progress{accent-color:var(--dv-teal)}body .student-workspace>.teacher-sidebar{border-color:var(--dv-line);width:256px;box-shadow:none}body .student-workspace>.teacher-sidebar .teacher-brand>b{background:var(--dv-teal)}body .student-workspace>.teacher-sidebar nav button,body .student-workspace>.teacher-sidebar nav a{border-radius:10px}body .student-workspace>.teacher-sidebar nav button.active{color:var(--dv-blue);background:var(--dv-blue-soft);box-shadow:inset 3px 0 var(--dv-blue)}body .student-workspace .teacher-panel,body .student-workspace .classroom-grid article{border-color:var(--dv-line);box-shadow:none;border-radius:14px}body .guardian-workspace{width:min(1160px,100% - 40px);padding:42px 0 80px}body .guardian-workspace .guardian-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;display:grid}body .guardian-workspace .guardian-card{border:1px solid var(--dv-line);background:#fff;border-radius:14px;padding:22px}body .guardian-workspace .guardian-card h2{margin:0 0 8px}body .guardian-workspace .guardian-card p{color:var(--dv-muted)}@media (max-width:780px){body .student-workspace-main{padding:16px 12px 92px}body .student-mobile-nav{border-radius:14px;box-shadow:0 14px 34px #172c4e24}body .student-mobile-nav a{border-radius:9px}body .student-workspace>.teacher-sidebar{display:none}body .student-workspace>.teacher-content{width:100%}body .guardian-workspace{width:calc(100% - 24px);padding:26px 0 60px}}
body:has(.dv-teacher-shell){background:var(--dv-canvas);margin:0}:is(body:has(.dv-teacher-shell) .site-header,body:has(.dv-teacher-shell) .site-footer){display:none}body .dv-teacher-shell{min-height:100vh;color:var(--dv-ink);background:0 0;grid-template-columns:284px minmax(0,1fr);display:grid}body .dv-teacher-sidebar{z-index:30;border-right:1px solid var(--dv-line);width:284px;height:100vh;box-shadow:none;background:#fffffff7;flex-direction:column;padding:16px 12px 10px;display:flex;position:sticky;top:0;overflow:auto}body .dv-teacher-brand-row{border-bottom:1px solid #edf1f7;margin:0 7px 14px;padding-bottom:13px}body .dv-brand-book{background:var(--dv-teal-bright);width:42px;height:42px;box-shadow:none;border:1px solid #bce5dc;border-radius:11px}body .dv-teacher-brand strong{color:var(--dv-blue);font-size:1.02rem}body .dv-teacher-brand small{color:#8b98ad;font-size:.6rem}body .dv-teacher-sidebar nav{gap:7px}body .dv-teacher-sidebar nav section{gap:2px}body .dv-teacher-sidebar nav h2{color:#91a0b6;letter-spacing:.055em;margin:8px 9px 4px;font-size:.62rem}body .dv-teacher-sidebar nav a{color:#3e4c65;border:0;border-radius:9px;min-height:38px;padding:7px 9px;font-size:.78rem;font-weight:750}body .dv-teacher-sidebar nav a:hover{color:var(--dv-blue);background:#f4f3ff}body .dv-teacher-sidebar nav a.active{color:#fff;background:var(--dv-blue);box-shadow:0 6px 14px #4f46e533}body .dv-teacher-sidebar nav a.active .dv-nav-icon{color:#fff}body .dv-nav-icon{flex-basis:19px;width:19px}body .dv-nav-icon.indigo,body .dv-nav-icon.blue,body .dv-nav-icon.purple{color:var(--dv-blue)}body .dv-nav-icon.teal,body .dv-nav-icon.green{color:var(--dv-teal-bright)}body .dv-teacher-sidebar nav em{color:#c21d58;background:#ffe1ed}body .dv-sidebar-bottom{gap:7px;padding-top:9px}body .dv-account-card,body .dv-theme-button{border-color:var(--dv-line);box-shadow:none;border-radius:10px;padding:7px}body .dv-account-card>span:first-child{background:var(--dv-blue);border-radius:9px;width:32px;height:32px}body .dv-account-card strong,body .dv-theme-button strong{font-size:.7rem}body .dv-account-card small,body .dv-theme-button small{color:var(--dv-blue);font-size:.54rem}body .dv-logout{color:#e52d54;min-height:36px;box-shadow:none;background:#fff;border:1px solid #0000;border-radius:9px;align-items:center;gap:7px;padding:8px 10px;display:flex}body .dv-teacher-stage{min-width:0}body .dv-teacher-canvas{background:0 0;min-height:100vh}body .dv-teacher-canvas>*{max-width:1600px;margin-inline:auto}body .dv-teacher-canvas>.teacher-console{background:0 0;min-height:100vh;display:block}body .dv-teacher-canvas>.teacher-console>.teacher-sidebar,body .dv-teacher-canvas>.teacher-console>.teacher-content>.teacher-topbar{display:none}body .dv-teacher-canvas>.teacher-console>.teacher-content>.teacher-main{width:calc(100% - 40px);max-width:1540px;margin:0 auto;padding:24px 0 56px}body .teacher-heading{gap:16px}body .teacher-heading h1,body .reference-workspace h1{letter-spacing:-.025em;margin:5px 0 3px;font-size:1.85rem}body .teacher-heading p{margin:0;line-height:1.5}body .teacher-panel{border-color:var(--dv-line);box-shadow:none;border-radius:15px;margin-top:14px;padding:18px}body .teacher-panel h2{font-size:1.15rem}body .teacher-form{gap:11px}body .teacher-form input,body .teacher-form select,body .teacher-form textarea{border-color:var(--dv-line);border-radius:9px;min-height:42px}body .reference-workspace{background:0 0;max-width:1600px;padding:22px 24px 56px}body .reference-hero,body .assessment-ai-hero{background:linear-gradient(112deg,#3933a9,#232c79 54%,#111b36);border:0;border-radius:17px;margin-bottom:18px;padding:22px 26px;box-shadow:0 10px 24px #181f4e21}body .reference-hero h1{margin:8px 0 3px;font-size:1.85rem}body .reference-hero p{color:#d4dcf2;line-height:1.5}body .reference-hero>a,body .reference-hero-actions a{border-radius:9px}body .reference-hero-actions a{background:var(--dv-blue)}body .reference-hero-actions .green{background:var(--dv-teal-bright)}body .reference-hero nav button{border-radius:8px;min-height:36px;padding:8px 13px}body .reference-panel,body .assessment-summary,body .operation-banner,body .online-tip{border-color:var(--dv-line);box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;background:#fffffff0;border-radius:15px;margin-bottom:16px;padding:18px}body .reference-panel>header{padding-bottom:12px}body .reference-search,body .tutor-search{border-color:var(--dv-line);background:#f9fbff;border-radius:10px;margin:13px 0;padding:9px 12px}body .gradebook-scroll,body .plan-comparison,body .premium-comparison{border-color:var(--dv-line);border-radius:12px}body .gradebook-scroll th,body .gradebook-scroll td{padding:10px}body .gradebook-scroll th{background:#eff2ff}body .dv-class-workspace{background:0 0;grid-template-columns:minmax(560px,1.35fr) minmax(340px,.9fr);gap:16px;padding:22px 22px 52px}body .dv-class-toolbar,body .dv-roster,body .dv-sheet-preview{border-color:var(--dv-line);box-shadow:none;background:#fffffff5;border-radius:15px}body .dv-class-toolbar{padding:11px}body .dv-class-toolbar>a{color:#fff;border-radius:9px;justify-content:center;align-items:center;min-height:40px;padding:0 14px;font-weight:800;text-decoration:none;display:flex}body .dv-indigo-action,body .dv-class-filters>button,body .dv-inline-form>button{background:var(--dv-blue);box-shadow:none}body .dv-emerald-action{background:var(--dv-teal-bright);box-shadow:none}body .dv-class-toolbar>.dv-light-action{border:1px solid var(--dv-line);color:var(--dv-ink);background:#fff}body .dv-class-toolbar input,body .dv-class-filters input,body .dv-class-filters select,body .dv-inline-form input,body .dv-inline-form select,body .dv-preview-content textarea{border-color:var(--dv-line);border-radius:9px}body .dv-class-bottom-actions a,body .dv-class-bottom-actions button{border:1px solid var(--dv-line);min-height:42px;color:var(--dv-blue);background:#fff;border-radius:9px;justify-content:center;align-items:center;font-weight:800;text-decoration:none;display:flex}body .dv-student-dialog{border-radius:16px;box-shadow:0 24px 64px #1821403d}body .dv-dialog-actions button:last-child{background:var(--dv-blue)}body .premium-reference{max-width:1600px;padding:22px 28px 52px}body .premium-title h1{font-size:1.5rem}body .premium-overview{border-color:var(--dv-line);box-shadow:none;background:#fff;border-radius:16px;margin-top:18px;padding:24px}body .premium-cards{gap:16px}body .premium-cards article{border-color:var(--dv-line);min-height:350px;box-shadow:none;border-radius:15px;padding:20px}body .premium-checkout,body .premium-comparison{border-color:var(--dv-line);box-shadow:none;border-radius:14px}body .content-repository{width:calc(100% - 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