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.btn{border-radius:var(--radius-control);white-space:nowrap;border:1.5px solid #0000;justify-content:center;align-items:center;gap:7px;height:46px;padding:0 20px;font-size:14.5px;font-weight:800;text-decoration:none;display:inline-flex}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand-hover)}.btn-ghost{background:var(--surface);border-color:var(--border);color:var(--text)}.btn-ghost:hover{background:var(--bg)}.btn-danger{background:var(--status-overdue);color:#fff}.btn-danger:hover{filter:brightness(.95)}.btn-sm{height:42px;padding:0 16px;font-size:13.5px}.btn-pair{gap:10px;margin-top:16px;display:flex}.btn-pair>.btn{flex:1}.icon-btn{border:1.5px solid var(--border);background:var(--surface);width:44px;height:44px;color:var(--text);border-radius:14px;flex:none;place-items:center;display:grid}.icon-btn:hover{background:var(--bg)}.btn-delete{color:var(--status-overdue);margin-right:auto}.status-text{color:var(--text-muted);font-size:14px}.status-text-error{color:var(--status-overdue)}.section-title{letter-spacing:.02em;text-transform:uppercase;color:var(--text-muted);margin:0 0 12px;font-size:13px;font-weight:800}.page-head{flex-wrap:wrap;align-items:center;gap:14px;margin-bottom:20px;display:flex}.page-head-title{min-width:0;margin-right:auto}.tabbar{gap:6px;margin:18px 0;padding-bottom:2px;display:flex;overflow-x:auto}.tab{min-height:44px;color:var(--text-muted);background:0 0;border:0;border-radius:13px;flex:none;align-items:center;padding:0 22px;font-size:14.5px;font-weight:800;display:inline-flex}.tab:hover{background:var(--bg)}.tab-active{background:var(--subject-fallback-bg);color:var(--brand)}
.auth-page{justify-content:center;min-height:100dvh;padding:24px 16px;display:flex}.auth-card{background:var(--surface);text-align:center;border-radius:20px;width:100%;max-width:380px;margin:auto;padding:32px 28px;box-shadow:0 10px 40px #00000014}.auth-brand{flex-direction:column;align-items:center;gap:10px;margin:0 auto 18px;display:flex}.auth-logo{width:auto;height:56px;display:block}.auth-wordmark{letter-spacing:-.02em;font-size:26px;font-weight:800;line-height:1}.auth-title{margin:0;font-size:28px}.auth-sub{color:var(--text-muted);margin:6px 0 24px;font-size:14px}.auth-google{justify-content:center;min-height:44px;display:flex}.auth-note{color:var(--text-muted);margin:20px 0 0;font-size:12px}.auth-boot{text-align:center;padding:40px}.current-user{margin-left:8px;position:relative}.current-user-button{cursor:pointer;font:inherit;background:0 0;border:0;border-radius:999px;align-items:center;gap:8px;padding:4px 10px 4px 4px;display:flex}.current-user-avatar{background:var(--accent-soft,var(--brand-soft));border-radius:999px;place-items:center;width:30px;height:30px;font-size:12px;font-weight:700;display:grid}.current-user-name{font-size:14px;font-weight:600}.current-user-menu{z-index:30;background:var(--surface);border-radius:14px;min-width:220px;padding:8px;display:none;position:absolute;top:calc(100% + 8px);right:0;box-shadow:0 10px 30px #0000001f}.current-user-open .current-user-menu{display:block}.current-user-head{border-bottom:1px solid var(--border);padding:8px 10px 10px}.current-user-head-name{font-size:14px;font-weight:700}.current-user-head-email{color:var(--text-muted);word-break:break-all;font-size:12px}.current-user-link{text-align:left;width:100%;font:inherit;color:inherit;cursor:pointer;background:0 0;border:0;border-radius:10px;padding:9px 10px;font-size:14px;display:block}.current-user-link:hover{background:var(--hover)}.current-user-signout{color:var(--danger,#c2413f)}.account-row{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;padding:12px 0;display:flex}.account-row:last-child{border-bottom:0}.account-row-main{min-width:0}.account-row-title{align-items:center;gap:8px;font-size:14px;font-weight:600;display:flex}.account-row-sub{color:var(--text-muted);word-break:break-word;margin-top:2px;font-size:12px}.account-badge{background:var(--accent-soft,var(--brand-soft));border-radius:999px;padding:2px 8px;font-size:11px;font-weight:700}.auth-choices{gap:10px;margin-top:8px;display:grid}.auth-choice{border:1px solid var(--border);text-align:left;width:100%;font:inherit;color:inherit;cursor:pointer;background:0 0;border-radius:14px;padding:14px 16px;display:block}.auth-choice:hover{border-color:var(--accent,var(--brand));background:var(--hover)}.auth-choice-label{font-size:15px;font-weight:700;display:block}.auth-choice-hint{color:var(--text-muted);font-size:12px;display:block}.auth-form{text-align:left;gap:12px;margin-top:4px;display:grid}.auth-label{color:var(--text-muted);margin-bottom:4px;font-size:12px;font-weight:700;display:block}.auth-input{border:1px solid var(--border);background:var(--surface);width:100%;font:inherit;color:inherit;border-radius:10px;padding:10px 12px;font-size:14px}.auth-input:focus{outline:2px solid var(--accent,var(--brand));outline-offset:1px}.auth-input-code{letter-spacing:.28em;text-transform:uppercase;font-size:20px;font-weight:700}.auth-submit{width:100%;margin-top:4px}.auth-divider{color:var(--text-muted);align-items:center;gap:10px;margin:20px 0 12px;font-size:12px;display:flex}.auth-divider:before,.auth-divider:after{content:"";background:var(--border);flex:1;height:1px}.auth-switch{width:100%;font:inherit;color:var(--accent,var(--brand));cursor:pointer;background:0 0;border:0;margin-top:18px;padding:8px;font-size:13px;font-weight:600}.auth-confirm{margin:18px 0 22px}.auth-confirm-avatar{background:var(--accent-soft,var(--brand-soft));border-radius:999px;place-items:center;width:64px;height:64px;margin:0 auto 12px;font-size:22px;font-weight:700;display:grid}.auth-confirm-name{font-size:18px;font-weight:700}.auth-confirm-parent{color:var(--text-muted);font-size:12px}.access-code-row{justify-content:space-between;align-items:center;gap:12px;margin-top:10px;display:flex}.access-code{letter-spacing:.24em;font-size:22px;font-weight:800}.auth-providers{justify-items:center;gap:8px;display:grid}.auth-provider{border:1px solid var(--border);width:280px;font:inherit;color:inherit;cursor:pointer;background:0 0;border-radius:999px;justify-content:center;align-items:center;gap:8px;padding:10px 14px;font-size:14px;font-weight:600;display:flex}.auth-provider:disabled{color:var(--text-muted);cursor:default}.auth-provider-note{color:var(--text-muted);font-size:11px;font-weight:600}.auth-optional{color:var(--text-placeholder);text-transform:none;font-weight:600}.auth-back{width:32px;height:32px;color:var(--text-muted);cursor:pointer;background:0 0;border:0;border-radius:999px;place-items:center;font-size:18px;line-height:1;display:grid;position:absolute;top:18px;left:18px}.auth-back:hover{background:var(--hover);color:var(--text)}.auth-card{position:relative}.register-form{gap:10px}.register-group-title{letter-spacing:.06em;text-transform:uppercase;color:var(--text-muted);margin:10px 0 0;font-size:11px;font-weight:700}.register-form .register-group-title:first-child{margin-top:0}.register-row{grid-template-columns:1fr 1fr;gap:10px;display:grid}@media (max-width:360px){.register-row{grid-template-columns:1fr}}.register-optional{border:1px dashed var(--border);border-radius:12px;margin-top:4px;padding:10px 12px}.register-optional-summary{color:var(--text-muted);cursor:pointer;justify-content:space-between;align-items:center;gap:8px;font-size:13px;font-weight:600;list-style:none;display:flex}.register-optional-summary::-webkit-details-marker{display:none}.register-optional-summary:before{content:"＋";margin-right:6px;font-weight:700}.register-optional[open] .register-optional-summary:before{content:"−"}.register-optional[open] .register-optional-summary{margin-bottom:10px}.register-optional .auth-field+.auth-field{margin-top:10px}.register-optional-note{color:var(--text-placeholder);margin-left:auto;font-size:11px;font-weight:600}
.user-menu-trigger{cursor:pointer;font:inherit;background:0 0;border:0;border-radius:999px;align-items:center;gap:8px;margin-left:auto;padding:4px 10px 4px 4px;display:flex}.user-menu-trigger:hover,.user-menu-trigger-on{background:var(--hover)}.user-menu-avatar{background:var(--accent-soft,var(--brand-soft));border-radius:999px;place-items:center;width:30px;height:30px;font-size:12px;font-weight:700;display:grid}.user-menu-name{font-size:14px;font-weight:600}.user-menu-caret{color:var(--text-muted);font-size:11px}.user-menu{z-index:60;background:var(--surface);border-radius:16px;width:268px;padding:6px;position:fixed;box-shadow:0 16px 44px #00000029}.user-menu-head{border-bottom:1px solid var(--border);padding:10px 12px}.user-menu-head-name{font-size:14px;font-weight:700}.user-menu-head-email{color:var(--text-muted);word-break:break-all;font-size:12px}.user-menu-section+.user-menu-section{border-top:1px solid var(--border)}.user-menu-section{padding:4px 0}.user-menu-item-avatar{color:#fff;border-radius:999px;place-items:center;width:22px;height:22px;font-size:10px;font-weight:700;display:grid}.user-menu-item-on{background:var(--hover)}.user-menu-item-tick{color:var(--accent,var(--brand));align-self:center;margin-left:auto;font-size:12px}.user-menu-item{text-align:left;width:100%;font:inherit;color:inherit;cursor:pointer;background:0 0;border:0;border-radius:10px;align-items:flex-start;gap:10px;padding:8px 12px;display:flex}.user-menu-item:hover{background:var(--hover)}.user-menu-item-glyph{color:var(--text-muted);place-items:center;padding-top:2px;display:grid}.user-menu-item-text{min-width:0}.user-menu-item-label{font-size:14px;font-weight:600;display:block}.user-menu-item-hint{color:var(--text-muted);font-size:12px;display:block}.user-menu-item-danger,.user-menu-item-danger .user-menu-item-glyph{color:var(--danger,#d64545)}.user-menu-foot{border-top:1px solid var(--border);margin-top:4px;padding-top:4px}.user-menu-avatar-img{border-radius:inherit;object-fit:cover;width:100%;height:100%;display:block}
.breadcrumb{margin-bottom:10px}.breadcrumb-list{color:var(--text-muted);flex-wrap:nowrap;align-items:center;gap:6px;margin:0;padding:0;font-size:13px;list-style:none;display:flex}.breadcrumb-item{align-items:center;gap:6px;min-width:0;display:flex}.breadcrumb-item:not(:last-child):after{content:"›";color:var(--text-muted);font-weight:700}.breadcrumb-link,.breadcrumb-text{text-overflow:ellipsis;white-space:nowrap;max-width:180px;display:block;overflow:hidden}.breadcrumb-link{color:var(--text-muted);font-weight:700;text-decoration:none}.breadcrumb-link:hover{color:var(--brand);text-decoration:underline}.breadcrumb-current .breadcrumb-text{max-width:320px;color:var(--text);font-weight:800}@media (max-width:767px){.breadcrumb-item:not(:nth-last-child(-n+2)){display:none}.breadcrumb-item:nth-last-child(2):not(:first-child):before{content:"…";color:var(--text-muted);font-weight:700}.breadcrumb-link,.breadcrumb-text{max-width:120px}.breadcrumb-current .breadcrumb-text{max-width:45vw}}.pagenav{margin-bottom:14px}.pagenav .breadcrumb{margin-bottom:8px}.pagenav-row{align-items:center;gap:10px;display:flex}.pagenav-back{border:1.5px solid var(--border);background:var(--surface);min-width:0;max-width:60%;min-height:38px;color:var(--text-muted);border-radius:999px;align-items:center;gap:8px;padding:0 14px 0 11px;font-size:13px;font-weight:800;text-decoration:none;display:inline-flex}.pagenav-back:hover{border-color:var(--brand);color:var(--brand)}.pagenav-back-label{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.pagenav-actions{align-items:center;gap:8px;margin-left:auto;display:flex}@media (max-width:767px){.pagenav-crumbs{display:none}.pagenav-back{max-width:55%}}
.card-grid{grid-template-columns:minmax(0,1fr);gap:14px;display:grid}.card-grid>*{min-width:0}@media (min-width:768px){.card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (min-width:1024px){.card-grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}}.hw-card{border:1px solid var(--border);border-left:6px solid var(--brand);border-radius:var(--radius-card);background:var(--surface);color:var(--text);padding:16px 18px;text-decoration:none;transition:transform .15s,box-shadow .15s;display:block}.hw-card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-2px)}.hw-card-head{align-items:flex-start;gap:10px;display:flex}.hw-card-title{letter-spacing:-.01em;margin-right:auto;font-size:16px;font-weight:800}.hw-card-badge{border-radius:var(--radius-chip);flex:none;padding:3px 10px;font-size:11px;font-weight:800}.hw-card-classroom{color:var(--text-muted);align-items:center;gap:4px;margin-top:4px;font-size:13px;font-weight:700;display:flex}.hw-card-student{color:var(--text);align-items:center;gap:7px;margin-top:10px;font-size:13px;font-weight:700;display:flex}.hw-card-avatar{color:#fff;border-radius:50%;flex:none;place-items:center;width:24px;height:24px;font-size:10px;font-weight:800;display:grid}.hw-card-foot{align-items:center;gap:12px;margin-top:12px;font-size:13px;font-weight:800;display:flex}.hw-card-due{align-items:center;gap:5px;display:inline-flex}.hw-card-attach{color:var(--text-muted);align-items:center;gap:4px;font-weight:700;display:inline-flex}.entity-card{border:1px solid var(--border);border-left:5px solid var(--brand);border-radius:var(--radius-card-lg);background:var(--surface);color:var(--text);padding:18px 20px;text-decoration:none;transition:transform .15s,box-shadow .15s;display:block}.entity-card:hover{box-shadow:var(--shadow-classroom-hover);transform:translateY(-2px)}.entity-card-top,.entity-card-head{align-items:center;gap:12px;display:flex}.entity-card-head-text{margin-right:auto}.entity-rows{margin-top:14px}.entity-row{justify-content:space-between;gap:12px;padding:7px 0;font-size:13.5px;display:flex}.entity-row+.entity-row{border-top:1px solid var(--border)}.entity-row-key{color:var(--text-muted);font-weight:700}.entity-row-val{text-align:right;font-weight:800}.badge-dot{border-radius:var(--radius-chip);align-items:center;gap:6px;padding:4px 11px;font-size:11.5px;font-weight:800;display:inline-flex}.badge-dot:before{content:"";background:currentColor;border-radius:50%;width:6px;height:6px}.badge-canceled{color:var(--status-overdue);background:var(--status-overdue-bg);margin-right:8px}.is-canceled{color:var(--text-muted);text-decoration:line-through;text-decoration-thickness:1.5px}.entity-avatar{color:#fff;border-radius:50%;flex:none;place-items:center;width:48px;height:48px;font-size:16px;font-weight:800;display:grid}.entity-avatar-lg{width:56px;height:56px;font-size:19px}.entity-glyph{border-radius:var(--radius-control);flex:none;place-items:center;width:48px;height:48px;font-size:18px;font-weight:800;display:grid}.entity-glyph-lg{width:56px;height:56px;font-size:20px}.entity-card-name{font-size:16px;font-weight:800}.entity-card-nick{margin-top:1px;font-size:13px;font-weight:800}.entity-card-sub{color:var(--text-muted);margin-top:2px;font-size:13px;font-weight:700}.entity-card-actions{gap:8px;margin-top:16px;display:flex}.entity-chip{border-radius:var(--radius-chip);padding:3px 10px;font-size:11.5px;font-weight:800}.stat-row{grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:18px;display:grid}.stat-card{border-radius:var(--radius-card);border:1.5px solid #0000;padding:18px 20px}.stat-label{font-size:13px;font-weight:800}.stat-value{letter-spacing:-.03em;margin-top:10px;font-size:30px;font-weight:800}.detail-card{border:1px solid var(--border);border-radius:var(--radius-card-lg);background:var(--surface);padding:22px 24px}.detail-card-title{margin:0 0 8px;font-size:16px;font-weight:800}.detail-card .info-row{padding:14px 0}.detail-card .info-row:last-child{border-bottom:0}.info-list{border:1px solid var(--border);border-radius:var(--radius-card);background:var(--surface);overflow:hidden}.info-row{border-bottom:1px solid var(--border);justify-content:space-between;gap:12px;padding:13px 18px;font-size:14px;display:flex}.info-row:last-child{border-bottom:0}.info-key{color:var(--text-muted);font-weight:700}.info-val{text-align:right;font-weight:800}.empty-state{border:1px solid var(--border);border-radius:var(--radius-empty);background:var(--surface);text-align:center;padding:48px 24px}.empty-state-icon{font-size:32px}.empty-state-title{margin:12px 0 4px;font-size:16px;font-weight:800}.empty-state-text{color:var(--text-muted);margin:0}.stack{flex-direction:column;gap:12px;display:flex}.stack-xs{flex-direction:column;gap:8px;display:flex}.kcard-glyph-img{border-radius:inherit;object-fit:cover;width:100%;height:100%;display:block}
.dlg-section+.dlg-section{border-top:1.5px solid var(--border);margin-top:18px;padding-top:18px}.dlg-section-title{letter-spacing:.04em;text-transform:uppercase;color:var(--text-muted);margin:0 0 4px;font-size:12px;font-weight:800}.dlg-section-sub{color:var(--text-muted);margin:0 0 10px;font-size:12px;line-height:1.45}
.ce{border:1.5px solid var(--border);border-radius:var(--radius-control);background:var(--surface);overflow:hidden}.ce:focus-within{border-color:var(--brand);box-shadow:0 0 0 4px #6c5ce724}.ce-toolbar{border-bottom:1px solid var(--border);background:var(--bg);scrollbar-width:none;flex-wrap:nowrap;align-items:center;gap:8px;padding:8px;display:flex;overflow-x:auto}.ce-toolbar::-webkit-scrollbar{display:none}.ce-primary-group{flex:none;align-items:center;gap:8px;display:flex}.ce-primary{border:1.5px solid var(--brand);background:var(--subject-fallback-bg);height:44px;color:var(--brand);white-space:nowrap;border-radius:10px;flex:none;align-items:center;gap:8px;padding:0 16px;font-family:inherit;font-size:14px;font-weight:800;display:inline-flex}.ce-primary:hover{background:var(--brand);color:#fff}.ce-tool{width:44px;height:44px;color:var(--text-muted);background:0 0;border:0;border-radius:10px;flex:none;place-items:center;display:grid}.ce-tool:hover{background:var(--surface);color:var(--text)}.ce-tool-active{background:var(--subject-fallback-bg);color:var(--brand)}.ce-tool-sep{background:var(--border);flex:none;width:1px;height:24px;margin:0 2px}.ce-format-group{flex:none;align-items:center;gap:4px;display:flex}.ce-overflow{flex:none;margin-left:auto}.ce-menu{z-index:1050;background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius-control);min-width:240px;max-width:calc(100vw - 16px);box-shadow:var(--shadow-card-hover);flex-direction:column;gap:2px;padding:6px;display:flex;position:fixed}.ce-menu-inline{border-bottom:1px solid var(--border);gap:4px;margin-bottom:4px;padding-bottom:6px;display:none}.ce-menu-item{width:100%;min-height:44px;color:var(--text);text-align:left;background:0 0;border:0;border-radius:10px;align-items:center;gap:12px;padding:0 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var(--topbar-h) - var(--bottomnav-h) - 166px);min-height:320px}.reader-collection+.reader-surface,.reader-learn-steps+.reader-surface{height:calc(100dvh - var(--topbar-h) - var(--bottomnav-h) - 232px)}.reader-head-open-label,.reader-learn-step-label{display:none}}