.studyPortal,.studyAdmin{--study-ink:#151515;--study-muted:#767676;--study-line:#e8e8e8;color:var(--study-ink);font-family:Arial,Microsoft YaHei,sans-serif;font-size:16px;line-height:1.6}.studyPortal{max-width:1180px;margin:auto;padding:0 32px 72px}.studyPortal *,.studyAdmin *{box-sizing:border-box}.studyTop{border-bottom:1px solid var(--study-line);justify-content:space-between;align-items:center;gap:20px;height:82px;display:flex}.studyTop>a:first-child{font-size:21px;font-weight:750}.studyTop span{color:var(--study-muted);margin-left:12px;font-size:14px;font-weight:400}.studyPortal a,.studyAdmin a{color:inherit;text-decoration:none}.studyPortal button,.studyAdmin button,.studySmall{color:#202020;cursor:pointer;box-shadow:none;background:#fff;border:1px solid #dedede;border-radius:999px;padding:10px 17px;font-size:14px;line-height:1.4}.studyPortal button:hover,.studyAdmin button:hover{background:#f3f3f3}.studyPortal button:disabled,.studyAdmin button:disabled{opacity:.45;cursor:not-allowed}.studyPortal .studyPrimary,.studyAdmin .studyPrimary{color:#fff;min-height:46px;box-shadow:none;background:#151515;border:1px solid #151515;border-radius:999px;justify-content:center;align-items:center;padding:12px 24px;font-weight:650;text-decoration:none;display:inline-flex}.studyPortal .studyPrimary:hover,.studyAdmin .studyPrimary:hover{background:#333}.studyPortal input,.studyAdmin input,.studyAdmin select{width:100%;min-width:0;font:inherit;color:#151515;outline-offset:3px;background:#f7f7f7;border:1px solid #dedede;border-radius:12px;padding:13px 14px}.studyPortal label,.studyAdmin label{color:#555;gap:8px;font-size:14px;display:grid}.studyPortal h1{letter-spacing:-1px;margin:14px 0;font-size:38px;line-height:1.2}.studyPortal h2,.studyAdmin h2{margin:0 0 8px;font-size:22px;line-height:1.35}.studyPortal h3,.studyAdmin h3{margin:0 0 12px;font-size:18px}.studyPortal p,.studyAdmin p{margin:6px 0 16px}.studyPortal small,.studyAdmin small{color:#777;font-size:13px;line-height:1.6;display:block}.studyLogin{max-width:490px;margin:70px auto 0;padding:20px 0}.studyLogin h1{margin:20px 0;font-size:46px}.studyLogin>p{color:#777}.studyLogin form{gap:24px;margin:36px 0 20px;display:grid}.studyLogin input{letter-spacing:.3px;height:60px;font-size:17px}.studyLogin>small{margin-top:26px}.studyBack{font-size:14px}.studyEyebrow{color:#747474;font-size:14px}.studyGreeting{justify-content:space-between;align-items:center;gap:20px;padding:36px 0 28px;display:flex}.studyInline{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.studyMuted{color:#777;font-size:14px}.studyQuick{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-bottom:26px;display:grid}.studyQuick a{background:#f4f4f4;border-radius:20px;gap:8px;padding:22px;display:grid}.studyQuick a>span{font-size:26px}.studyQuick a>b{font-size:17px}.studyQuick a:hover{background:#ededed}.studyPanel{background:#fff;border:1px solid #e8e8e8;border-radius:20px;min-width:0;margin:0 0 24px;padding:26px}.studySectionHead{justify-content:space-between;align-items:flex-start;gap:18px;min-width:0;margin-bottom:14px;display:flex}.studySectionHead p{color:#777;margin:0;font-size:14px}.studySectionHead h3{margin:0}.studyGenerate{flex-wrap:wrap;align-items:flex-end;gap:12px;margin:24px 0;display:flex}.studyGenerate>label{flex:1;min-width:140px;max-width:380px}.studyPortal .studyGenerate>label{max-width:150px}.studyMembers,.studyGroups{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;display:grid}.studyMember,.studyGroup{background:#fcfcfc;border:1px solid #e7e7e7;border-radius:15px;min-width:0;padding:18px}.studyMember>.studyInline{margin:12px 0 4px}.studyBadge{white-space:nowrap;color:#315e23;background:#d6e9a9;border-radius:8px;padding:4px 10px;font-size:12px}.studyBadge.disabled{color:#8b3a56;background:#fac5d7}.studyCode{overflow-wrap:anywhere;color:#1a1a1a;-webkit-user-select:all;user-select:all;padding:12px 0;font-family:Consolas,monospace;font-size:16px;line-height:1.5;display:block}.studyEmpty{text-align:center;color:#777;background:#f8f8f8;border-radius:12px;grid-column:1/-1;padding:35px 16px}.studyStats{grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-bottom:24px;display:grid}.studyStats article{background:#f5f5f5;border-radius:16px;padding:20px}.studyStats b{font-variant-numeric:tabular-nums;margin-top:6px;font-size:30px;font-weight:700;display:block}.studyStats small{font-size:14px}.studyRewardColumns{grid-template-columns:1fr 1fr;gap:28px;display:grid}.studyRecord{overflow-wrap:anywhere;border-bottom:1px solid #eee;justify-content:space-between;align-items:center;gap:16px;padding:16px 0;display:flex}.studyRecord b{font-size:14px;font-weight:500}.studyRecord strong{font-size:20px}.studyMemo{background:#f7f7f7;border-radius:12px;padding:12px 16px}.studyError{background:#fff0f4;border:1px solid #f5d9e2;border-radius:10px;padding:12px 15px;font-size:14px;color:#9b2946!important}.studyFootnote{color:#888;font-size:13px;margin-top:28px!important}.studySearch{align-items:center;gap:10px;margin:20px 0;display:flex}.studySearch input{flex:1;max-width:500px}.studySearch button{flex-shrink:0}.studyGroup.selected{border-color:#222}.studyGroup p{color:#777;font-size:14px}.studyPager{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:10px;padding-top:20px;font-size:14px;display:flex}.studyPager span{color:#777;margin-right:auto}.studySelect{max-width:460px;margin-bottom:22px}.studyRewardEditor{background:#f8f8f8;border-radius:16px;margin-bottom:24px;padding:22px}.studyFormGrid{border-bottom:1px solid #ddd;grid-template-columns:1fr 1fr;gap:16px;margin:22px 0;padding-bottom:24px;display:grid}.studyFormGrid>button{justify-self:start}.studyRewardColumns form{align-content:start;gap:14px;display:grid}.studyRewardColumns form>button{justify-self:start}.studyCustomerList{gap:14px;display:grid}.studyCustomerList>article{border:1px solid #e8e8e8;border-radius:14px;padding:20px}.studyCustomerList dl{grid-template-columns:1fr 1fr;gap:12px 24px;margin:16px 0 0;font-size:14px;display:grid}.studyCustomerList dt{color:#888;font-size:13px}.studyCustomerList dd{overflow-wrap:anywhere;margin:3px 0 0}.systemEntries h1{margin:60px 0 28px}.studyEntryGrid{grid-template-columns:repeat(3,1fr);gap:20px;display:grid}.studyEntryGrid>a{background:#f4f4f4;border-radius:22px;padding:30px;display:block}.studyEntryGrid small{margin-bottom:30px}.studyEntryGrid p{color:#777;min-height:64px}.studyEntryGrid b{margin-top:28px;display:block}:is(.studyPortal :focus-visible,.studyAdmin :focus-visible){outline-offset:3px;outline:2px solid #262626}@media (max-width:800px){.studyPortal{padding:0 20px 50px}.studyTop{height:68px}.studyTop>a:first-child{font-size:18px}.studyTop span{margin:0;font-size:12px;display:block}.studyTop>a:last-child{font-size:14px}.studyGreeting{flex-direction:column;align-items:flex-start;padding:28px 0}.studyPortal h1{font-size:32px}.studyQuick{gap:8px}.studyQuick a{border-radius:14px;padding:14px 10px}.studyQuick a>b{font-size:14px}.studyQuick a>small{font-size:12px}.studyPanel{border-radius:16px;padding:18px}.studyMembers,.studyGroups,.studyRewardColumns,.studyEntryGrid{grid-template-columns:1fr}.studyStats{grid-template-columns:1fr 1fr;gap:10px}.studyStats article{padding:16px}.studyStats b{font-size:26px}.studyGenerate{align-items:stretch}.studyGenerate .studyPrimary{flex:1}.studyFormGrid{grid-template-columns:1fr}.studyRewardEditor{padding:16px}.studyPortal h2,.studyAdmin h2{font-size:20px}.studyLogin{margin:35px auto 0}.studyLogin h1{font-size:38px}.studyAdmin .studySectionHead{flex-wrap:wrap}.studyCustomerList dl{grid-template-columns:1fr}.studyCode{font-size:14px}.studySearch{flex-wrap:wrap}.studySearch input{flex-basis:100%}.systemEntries h1{margin-top:32px}.studyEntryGrid p{min-height:0}.studyEntryGrid small{margin-bottom:15px}.studyEntryGrid b{margin-top:18px}}.studyMonth{max-width:240px;margin-bottom:22px}.studentReturn{white-space:nowrap;color:#222;border:1px solid #ddd;border-radius:20px;padding:8px 12px;font-size:14px;text-decoration:none}@media (max-width:480px){.topbar .studentReturn{padding:6px 8px;font-size:12px}.studyGreeting>.studyInline{width:100%}}.studySectionHead>button{white-space:nowrap;flex-shrink:0}.studyPanelTabs{border-bottom:1px solid #e8e8e8;gap:8px;margin:0 0 22px;padding-bottom:12px;display:flex}.studyPanelTabs button.active{color:#fff;background:#151515;border-color:#151515}@media (max-width:800px){.studyGenerate{align-items:flex-end}.studyGenerate>.studyPrimary{min-height:48px;max-height:52px}}.teachingShell{color:#151515;max-width:1300px;margin:auto;padding:0 28px 40px;font-family:Arial,Microsoft YaHei,sans-serif}.teachingHeader{border-bottom:1px solid #e8e8e8;justify-content:space-between;align-items:center;gap:20px;min-height:80px;display:flex}.teachingHeader>div{align-items:center;gap:20px;display:flex}.teachingHeader a{color:#333;font-size:14px;text-decoration:none}.teachingHeader strong{font-size:24px}.teachingTabs{gap:24px;margin:24px 0;display:flex}.teachingTabs button{color:#777;cursor:pointer;background:0 0;border:0;border-bottom:2px solid #0000;padding:12px 2px;font-size:16px}.teachingTabs button.active{color:#151515;border-color:#151515;font-weight:700}.teachingContent{min-width:0}.teachingSupport .supportDesk{height:calc(100vh - 190px);height:calc(100dvh - 190px);min-height:450px}.teachingSupport .supportDesk.expanded{height:100vh;height:100dvh}@media (max-width:700px){.teachingShell{padding:0 14px 24px}.teachingHeader{align-items:flex-start;gap:12px;padding:18px 0}.teachingHeader>div{flex-direction:column;align-items:flex-start;gap:8px}.teachingHeader strong{font-size:20px}.teachingHeader a{font-size:13px}.teachingTabs{gap:22px;margin:12px 0}.teachingTabs button{font-size:14px}.teachingSupport .supportDesk{height:calc(100vh - 190px);height:calc(100dvh - 190px);min-height:380px}}.studyAdminTools>summary{cursor:pointer;font-weight:600}.studyAdminTools[open]>summary{margin-bottom:22px}.studyAdminTools>.studyPanel:last-child{margin-bottom:0}.studyJumpTarget{scroll-margin-top:20px}.studyJumpTarget:focus{outline:none}.studyCreated{background:#f8fbf3;border-color:#9fba83}.studyCreated .studyCode{font-size:20px;font-weight:600}.studyInviteSummary{overflow-wrap:anywhere;background:#f4f4f4;border-radius:12px;padding:12px 15px;font-size:14px}@media (max-width:800px){.studyCreated .studyCode{font-size:16px}.studyJumpTarget{scroll-margin-top:12px}}.adminSessionBar{color:#333;background:#fff;border-bottom:1px solid #eee;padding:8px 24px;font-size:14px}.adminSessionBar>div{justify-content:flex-end;align-items:center;gap:16px;display:flex}.adminSessionBar button,.adminSessionBar a{font:inherit;cursor:pointer;color:inherit;background:0 0;border:0;padding:6px}.adminPasswordForm{gap:12px;max-width:380px;margin:16px 0 16px auto;display:grid}.adminPasswordForm label{gap:6px;display:grid}.adminPasswordForm input{border:1px solid #ddd;border-radius:10px;padding:12px;font-size:16px}.adminPasswordForm .studyPrimary{color:#fff;background:#151515;border-radius:24px;padding:12px}.adminPasswordForm small{color:#777}.adminSessionBar .studyError{max-width:380px;margin-left:auto}.studyGreeting>div{min-width:0;max-width:100%}.studyGreeting h1,.studyGreeting .studyEyebrow,.studySectionHead>div{overflow-wrap:anywhere;word-break:break-word}.studySectionHead>div{min-width:0}@media (max-width:480px){.studyPortal .studyGenerate{grid-template-columns:minmax(0,1fr);align-items:stretch;display:grid}.studyPortal .studyGenerate>label{min-width:0;max-width:none}.studyPortal .studyGenerate>button{white-space:normal;width:100%;min-width:0;max-height:none}}.adminTotpSetup{background:#fafafa;border:1px solid #e1e1e1;border-radius:14px;gap:12px;min-width:0;padding:18px;display:grid}.adminTotpSetup p{margin:0}.adminTotpSetup textarea{box-sizing:border-box;resize:none;color:#151515;overflow-wrap:anywhere;word-break:break-all;background:#fff;border:1px solid #d5d5d5;border-radius:10px;width:100%;padding:12px;font:16px/1.6 Consolas,monospace}.adminTotpSetup>button{justify-self:start}.adminTotpSetup [role=timer]{font-variant-numeric:tabular-nums;font-size:14px}.adminTotpQr{justify-items:center;gap:6px;min-width:0;margin:0;display:grid}.adminTotpQr svg{aspect-ratio:1;background:#fff;border:1px solid #ddd;border-radius:4px;width:256px;max-width:100%;height:auto;display:block}.adminTotpQr figcaption{color:#555;text-align:center;overflow-wrap:anywhere;max-width:100%;font-size:12px;line-height:1.6}.adminTotpSetup summary{cursor:pointer;font-size:14px}.adminTotpSetup details[open]{gap:12px;display:grid}.adminTotpSetup details>button,.adminTotpSetup details>p{margin-top:10px}.registrationMethodsGrid{grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:16px;display:grid}.registrationMethodCard{border:1px solid #dedede;border-radius:12px;min-width:0;padding:18px}.registrationMethodCard h3{margin:0;font-size:16px}.registrationMethodCard p{line-height:1.65}.registrationMethodSwitch{white-space:nowrap;justify-content:center;align-items:center;gap:8px;min-width:104px;color:#444!important;background:#f1f1f1!important;border:1px solid #aaa!important;display:inline-flex!important}.registrationMethodSwitch span{background:#888;border-radius:50%;width:12px;height:12px}.registrationMethodSwitch[aria-checked=true]{color:#07573f!important;background:#e7f6ef!important;border-color:#147c63!important}.registrationMethodSwitch[aria-checked=true] span{background:#147c63}.registrationMethodSwitch:focus-visible{outline-offset:2px;outline:3px solid #3b82f6}.registrationMethodSwitch:disabled{opacity:.6}