:root{--dl-font:"Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;--dl-canvas:#f3f6f8;--dl-surface:#fff;--dl-surface-soft:#f7f9fb;--dl-ink:#1d2b34;--dl-muted:#566873;--dl-faint:#627581;--dl-line:#dce4e9;--dl-line-soft:#e9eef2;--dl-control:#b8c8d2;--dl-accent:#07566f;--dl-accent-hover:#06465b;--dl-accent-soft:#edf4f7;--dl-focus:#267b99;--dl-success:#166449;--dl-success-soft:#edf7f1;--dl-warning:#855614;--dl-warning-soft:#fff6e8;--dl-danger:#a63d43;--dl-danger-soft:#fcf0f0;--dl-radius:8px;--dl-control-radius:6px;--dl-gap:16px}:root body{font-family:var(--dl-font);color:var(--dl-ink);background:var(--dl-canvas)}:root :is(button,input,textarea,select){letter-spacing:0;font-family:inherit}:root :is(button,a,input,textarea,select,summary):focus-visible{outline:2px solid var(--dl-focus);outline-offset:3px}:root :is(input,textarea)::placeholder{color:var(--dl-faint);opacity:1}:root :is(input[type=checkbox],input[type=radio],progress){accent-color:var(--dl-accent)}:root 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.system-selection-card{border-radius:var(--dl-radius);border-color:var(--dl-line);background:var(--dl-surface);box-shadow:none;min-height:270px;padding:28px;transition:border-color .16s,background-color .16s}:root .system-selection-card:hover{background:#fcfdfe;border-color:#89a8ba}:root .system-selection-icon{width:auto;height:auto;color:var(--dl-accent);background:0 0;border-radius:0;margin:0 0 22px}:root .system-selection-card>small{letter-spacing:0;color:var(--dl-muted);font-size:12px}:root .system-selection-card h2{color:var(--dl-ink);font-size:23px}:root .system-selection-card p{color:var(--dl-muted);margin-bottom:18px;font-size:14px}:root .system-selection-enter{color:var(--dl-accent);font-size:14px}:root .system-selection-desktop{color:var(--dl-success);background:var(--dl-success-soft);border-radius:4px;font-size:12px}:root .system-selection-footer{color:var(--dl-muted);margin-top:32px;font-size:12px}:root .system-selection-footer 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.portal-login-panel{width:calc(100% - 36px);margin-top:28px}}@media (width>=701px) and (height<=720px){:root .system-selection{padding-block:22px}:root .system-selection-intro{margin-top:26px}:root .system-selection-card{min-height:230px;padding:24px}}:root :is(.portal-login,.portal-teacher,.portal-student,.portal-dialog){--portal-ink:var(--dl-ink);--portal-muted:var(--dl-muted);--portal-accent:var(--dl-accent);--portal-line:var(--dl-line);color:var(--dl-ink);font-family:var(--dl-font);font-size:14px;line-height:1.6}:root .portal-teacher{background:var(--dl-canvas)}:root .portal-sidebar{background:var(--dl-canvas);border-right:0;padding:24px 16px 20px}:root .portal-sidebar-caption{color:var(--dl-muted);margin-top:32px;font-size:12px}:root .portal-sidebar nav button{border-radius:var(--dl-control-radius);min-height:44px;color:var(--dl-muted);padding:11px 14px;font-size:14px;line-height:1.5}:root .portal-sidebar nav 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.portal-badge{min-height:23px;color:var(--dl-muted);white-space:nowrap;background:#edf1f4;border-radius:4px;padding:2px 7px;font-size:12px;line-height:1.5}:root .portal-badge.green{background:var(--dl-success-soft);color:var(--dl-success)}:root .portal-badge.amber{background:var(--dl-warning-soft);color:var(--dl-warning)}:root .portal-badge.red{background:var(--dl-danger-soft);color:var(--dl-danger)}:root :is(.portal-error,.portal-global-error){background:var(--dl-danger-soft);color:var(--dl-danger);border-radius:var(--dl-control-radius);border-color:#ebc9cb;font-size:14px}:root :is(.portal-empty,.portal-loading){color:var(--dl-muted);font-size:14px}:root .portal-empty{padding:28px 16px;line-height:1.8}:root .portal-note{color:var(--dl-muted);background:var(--dl-surface-soft);border-color:var(--dl-line);border-radius:var(--dl-control-radius);font-size:14px}:root 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.weekly-picker>div button{color:var(--dl-ink);border-color:var(--dl-line);min-height:44px}:root .weekly-student-days{border-color:var(--dl-line);border-radius:var(--dl-radius);overflow:hidden}:root .weekly-student-days>section{border-color:var(--dl-line)}:root .weekly-student-days :is(time,small,p){color:var(--dl-muted);font-size:12px}:root .weekly-student-days .weekly-today{box-shadow:inset 0 1px var(--dl-accent);background:#f1f7f9}:root .portal-daily-task-list>li{border-color:var(--dl-line-soft);padding:18px 0}:root .portal-daily-task-list h2{font-size:17px}:root .portal-daily-task-list p{color:var(--dl-muted);font-size:13px}:root .exam-marking-list article{border-color:var(--dl-line)}:root .exam-marking-list h3{color:var(--dl-ink);font-size:17px}:root .exam-marking-list p{color:var(--dl-muted);font-size:14px}:root .exam-objective-result{border-color:var(--dl-line)}:root .exam-objective-result header>strong{color:var(--dl-accent)}@media (width<=1100px){:root .portal-overview-columns{grid-template-columns:minmax(0,1fr)}:root .portal-activity{border:0;border-top:1px solid var(--dl-line);padding:24px 0 0}}@media (width<=700px){:root .portal-sidebar{background:var(--dl-surface);border:0;min-width:0;padding:6px 8px 0}:root .portal-sidebar nav{scrollbar-width:thin;justify-content:flex-start;gap:4px;padding-bottom:6px;overflow-x:auto}:root .portal-sidebar nav button{white-space:nowrap;flex:none;min-height:44px;padding:10px;font-size:13px}:root .portal-topbar{gap:10px;min-height:56px;padding:0 16px}:root .portal-topbar>div{gap:10px}:root .portal-main{border:0;border-top:1px solid var(--dl-line);border-radius:0;margin:0;padding:20px 16px 28px}:root .portal-page-title{flex-wrap:wrap;align-items:flex-start;margin-bottom:20px}:root .portal-page-title h1{font-size:23px}:root .portal-page-title .portal-actions{margin-left:auto}:root :is(.portal-primary,.portal-secondary,.portal-icon,.portal-product-link){min-height:44px}:root .portal-page-title 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