:root{color-scheme:light;--ink:#111111;--muted:#626975;--blue:#2563eb;--blue-hover:#1d4ed8;--line:#e3e6ec;--surface:#f6f8fb;--light-blue:#f2f6ff;--red:#dc2626;--bs-primary:#2563eb;--bs-body-font-family:"Segoe UI Variable","Microsoft YaHei UI","Microsoft YaHei",sans-serif;--bs-body-color:var(--ink);--bs-border-radius:.65rem;--motion:180ms}
*{box-sizing:border-box}body{margin:0;background:#fff;font-size:15px;line-height:1.6}button,input,select,summary{font:inherit}button:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid #2563eb;outline-offset:4px}button,.form-control,.form-select{transition:background-color var(--motion),border-color var(--motion),box-shadow var(--motion),transform 120ms,opacity var(--motion)}button:hover:not(:disabled){transform:scale(1.02)}button:active:not(:disabled){transform:scale(.98)}button:disabled{opacity:.48;cursor:not-allowed}.app-shell{max-width:1280px;margin:auto;padding:0 36px}h1,h2,h3,p{margin:0}h1{font-size:19px;font-weight:700;letter-spacing:-.5px}.app-header{min-height:94px;display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.brand-mark{display:grid;place-items:center;width:38px;height:38px;background:var(--blue);border-radius:12px}.brand-mark img{width:22px;height:22px;filter:brightness(0) invert(1)}.btn{min-height:44px;font-size:14px;font-weight:600;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 16px}.btn img,.icon{height:18px;width:18px}.btn-primary{--bs-btn-bg:var(--blue);--bs-btn-border-color:var(--blue);--bs-btn-hover-bg:var(--blue-hover);--bs-btn-hover-border-color:var(--blue-hover);--bs-btn-active-bg:#1e40af;--bs-btn-active-border-color:#1e40af}.btn-primary img{filter:brightness(0) invert(1)}.btn-light{--bs-btn-bg:#f5f6f8;--bs-btn-border-color:#f5f6f8;--bs-btn-hover-bg:#e9edf4;--bs-btn-hover-border-color:#e9edf4;--bs-btn-active-bg:#e2e8f2;color:#252b36}.btn-outline-secondary{--bs-btn-color:#303642;--bs-btn-border-color:#cdd3dd;--bs-btn-hover-bg:#f1f4f9;--bs-btn-hover-color:#111;--bs-btn-hover-border-color:#a9b4c7;--bs-btn-active-bg:#e6ebf4;--bs-btn-active-color:#111;--bs-btn-active-border-color:#a9b4c7}.demo-badge{font-size:12px;background:#eaf0ff;color:#1d4ed8;border-radius:5px;padding:3px 7px}main{padding-top:28px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 264px;gap:32px}.main-column{min-width:0}.monitor-panel{padding:26px 28px 0;border:1px solid #cad9f8;border-radius:16px;background:linear-gradient(125deg,#f5f8ff 0%,#fff 75%);overflow:hidden}.monitor-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:26px}.status-pill{display:flex;align-items:center;gap:8px;color:#414b5c;font-size:13px}.status-dot{display:inline-block;background:#8b94a3;width:7px;height:7px;border-radius:50%;flex:none;transition:background-color var(--motion)}.is-running .status-dot{background:var(--blue);box-shadow:0 0 0 4px #2563eb12}.muted{color:var(--muted);font-size:13px}#course-title{font-size:29px;font-weight:700;line-height:1.35;letter-spacing:-.6px;overflow-wrap:anywhere}.lesson-line{margin-top:10px;color:#566172;font-size:14px}.watch-status{display:flex;gap:15px;align-items:center;margin:32px 0}.watch-symbol{width:49px;height:49px;background:#eaf0ff;border-radius:15px;display:grid;place-items:center;flex:none}.watch-symbol img{width:24px;height:24px}.watch-status h3{font-size:18px;font-weight:600;line-height:1.5}.watch-status p{font-size:13px;color:var(--muted);margin-top:4px;max-width:40ch}.main-actions{display:flex;flex-wrap:wrap;gap:10px}.main-actions .btn-primary{min-width:156px}.check-strip{display:flex;justify-content:space-between;gap:12px;margin-top:26px;padding:16px 0;border-top:1px solid #e0e7f3;font-size:12px;color:var(--muted)}.check-strip strong{margin-left:7px;color:#404b5c;font-weight:500;font-variant-numeric:tabular-nums}.settings-panel{border-left:1px solid var(--line);padding-left:26px;padding-top:4px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:18px}.section-heading h2{font-size:16px;font-weight:650}.form-label{font-size:13px;font-weight:600;margin:0 0 9px}.form-select,.form-control{font-size:14px;border-color:#cdd3dd;min-height:44px;background-color:#fff;border-radius:8px}.form-select:focus,.form-control:focus{border-color:var(--blue);box-shadow:0 0 0 3px #2563eb20}.field-hint{font-size:12px;color:var(--muted);line-height:1.65;margin:10px 0 22px}.sound-row{display:flex;align-items:center;justify-content:space-between;margin:22px 0;font-size:14px}.form-switch{min-height:44px;padding-left:0;display:flex;align-items:center;margin:0}.form-switch .form-check-input{float:none;margin:0;width:38px;height:22px;cursor:pointer;border-color:#b9c2d1;background-color:#e8ecf2;transition:background-position .2s ease,background-color .2s}.form-check-input:checked{background-color:var(--blue);border-color:var(--blue)}.form-check-input:focus{box-shadow:0 0 0 3px #2563eb30;border-color:var(--blue)}.save-button,.test-button{width:100%}.settings-divider{height:1px;background:var(--line);margin:24px 0 18px}.text-button{border:0;background:none;color:#576174;font-size:12px;min-height:44px;padding:8px 0;display:inline-flex;align-items:center;justify-content:center;gap:5px;cursor:pointer}.text-button img{height:14px;width:14px}.text-button:hover{color:var(--blue)}#notification-settings{width:100%}details{border-top:1px solid var(--line);margin-top:14px;padding-top:7px}summary{cursor:pointer;min-height:44px;padding:10px 0;font-size:13px;font-weight:500;transition:color var(--motion)}summary:hover{color:var(--blue)}details form{padding-top:10px}#import{width:100%;margin-top:10px}#lesson-field{margin:0 0 20px}.connection-box{display:flex;align-items:flex-start;gap:10px;margin-top:25px;font-size:12px}.connection-box>.status-dot{margin-top:7px}.connection-box strong{display:block;font-weight:500}.connection-box span:not(.status-dot){display:block;color:var(--muted);margin-top:3px}.connection-box.connected .status-dot{background:var(--blue)}.activity-section,.history-section{margin-top:29px}.activity-section .section-heading .btn{font-size:12px;padding:6px 10px;min-height:40px}.empty-inline{font-size:13px;color:var(--muted);padding:16px 0 18px;border-bottom:1px solid var(--line)}.history-empty{padding:24px 0 34px;display:flex;align-items:center;gap:12px;font-size:13px;color:var(--muted)}.history-empty img{width:20px;height:20px;opacity:.55}.activity-row,.history-row{padding:14px 0;display:flex;align-items:center;justify-content:space-between;gap:14px;border-bottom:1px solid var(--line);transition:background-color var(--motion),transform var(--motion)}.activity-row:hover,.history-row:hover{background:#f8faff}.activity-row strong,.history-row strong{font-size:14px;font-weight:600;display:block;overflow-wrap:anywhere}.activity-row small,.history-row small{display:block;font-size:12px;color:var(--muted);margin-top:4px}.activity-state{font-size:12px;color:#5c6574;white-space:nowrap;padding:4px 9px;background:#f3f5f8;border-radius:5px}.activity-state.active{background:#eaf1ff;color:#1d4ed8}.history-row .text-button{flex:none;color:var(--blue);font-size:13px}.error-banner,.notice{display:flex;gap:10px;align-items:flex-start;padding:13px 16px;border-radius:9px;margin-bottom:20px;font-size:14px;animation:appear .2s ease-out}.error-banner{background:#fff3f3;color:#a61c1c;border:1px solid #f3cece}.error-banner img{width:18px;height:18px;flex:none;margin-top:2px}.notice{color:#1d4ed8;background:#eff5ff;border:1px solid #dce8ff}.field-error{color:#b91c1c;font-size:12px;line-height:1.6;margin-top:10px}.demo-tools{border:1px dashed #adc4f5;background:#f8faff;padding:12px;margin-bottom:20px;border-radius:9px;display:flex;gap:8px;flex-wrap:wrap;align-items:center}.demo-tools span{font-size:12px;width:100%;color:#4b5e80}.demo-tools .btn{font-size:12px;padding:7px 10px;min-height:38px}footer{margin-top:30px;border-top:1px solid var(--line);padding:14px 0;display:flex;justify-content:space-between;gap:16px;align-items:center;color:var(--muted);font-size:12px}footer span{max-width:68ch}#quit{white-space:nowrap}[hidden]{display:none!important}.app-shell{animation:appear .25s ease-out}.changed{animation:appear .18s ease-out}@keyframes appear{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:760px){.app-shell{padding:0 20px}.workspace{grid-template-columns:minmax(0,1fr);gap:28px}.settings-panel{border-left:0;border-top:1px solid var(--line);padding:24px 0 0}.app-header{min-height:82px}h1{font-size:17px}.monitor-panel{padding:22px 20px 0}#course-title{font-size:26px}.monitor-top{flex-wrap:wrap;margin-bottom:22px}.watch-status{margin:26px 0}.settings-panel form{max-width:100%}footer{align-items:flex-start}.section-heading .btn{max-width:170px}#today-label{font-size:12px}.brand{gap:8px}.brand-mark{width:32px;height:32px}.app-header>.btn{padding:8px 10px;font-size:12px}.check-strip{flex-wrap:wrap}.main-actions .btn{flex:1;white-space:nowrap}.demo-badge{margin-left:40px}.history-row{align-items:flex-start}}
.brand{min-width:0}.app-header>.btn{flex-shrink:0;white-space:nowrap}h1{white-space:nowrap}.activity-section .section-heading .btn,.demo-tools .btn{min-height:44px}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}button:hover:not(:disabled),button:active:not(:disabled){transform:none}}

.view-tabs{display:flex;gap:24px;border-bottom:1px solid var(--line);margin-bottom:28px}
.view-tab{padding:10px 2px 14px;min-height:44px;border:0;border-bottom:3px solid transparent;background:transparent;color:var(--muted);font-weight:600;transition:color var(--motion),border-color var(--motion)}
.view-tab.selected{color:var(--blue);border-bottom-color:var(--blue)}
.view-tab:hover{color:var(--blue)}
.homework-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px}
.homework-heading h2{font-size:26px;font-weight:700;margin-bottom:6px}
.homework-actions{display:flex;flex-wrap:wrap;gap:8px}
.homework-stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border:1px solid var(--line);border-radius:12px;background:var(--surface);margin-bottom:26px}
.homework-stats>div{padding:18px 24px;border-right:1px solid var(--line)}
.homework-stats>div:last-child{border:0}
.homework-stats span{display:block;font-size:13px;color:var(--muted)}
.homework-stats strong{display:block;font-size:30px;line-height:1.4;font-variant-numeric:tabular-nums}
#hw-due,#hw-overdue{color:var(--red)}
.homework-filters{display:grid;grid-template-columns:1.1fr 1fr 1.4fr 1fr;gap:14px;margin-bottom:20px}
.homework-filters>div{min-width:0}
.homework-meta{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:12px;margin:12px 0}
.homework-row{padding:22px 4px;display:flex;justify-content:space-between;align-items:center;gap:24px;border-top:1px solid var(--line);animation:appear .18s ease-out;transition:background-color var(--motion)}
.homework-row:hover{background:#f8faff}
.homework-copy{min-width:0;overflow-wrap:anywhere}
.homework-row h3{font-size:17px;font-weight:600;line-height:1.5;margin:4px 0 7px}
.homework-course-name{font-size:12px;color:var(--muted)}
.homework-deadline{font-size:13px;color:#414b5c;font-variant-numeric:tabular-nums}
.homework-row-actions{display:flex;align-items:center;gap:24px;flex-shrink:0}
.activity-state.due,.activity-state.overdue{background:#fff1f1;color:#b91c1c}
.activity-state.pending{background:#eaf1ff;color:#1d4ed8}
.homework-empty{padding:55px 20px;text-align:center;color:var(--muted);background:var(--surface);border-radius:10px;font-size:14px}
.homework-note{font-size:12px;color:var(--muted);padding:18px 0;border-top:1px solid var(--line)}
.homework-history{margin-top:0}
@media(max-width:960px){.homework-heading{align-items:flex-start;flex-direction:column}.homework-filters{grid-template-columns:repeat(2,minmax(0,1fr))}.homework-row-actions{gap:12px}}
@media(max-width:600px){.homework-stats{grid-template-columns:repeat(2,minmax(0,1fr))}.homework-stats>div{padding:14px 16px;border-bottom:1px solid var(--line)}.homework-stats>div:nth-child(2){border-right:0}.homework-stats>div:nth-child(3){border-bottom:0}.homework-row{align-items:flex-start;flex-direction:column;gap:14px}.homework-row-actions{width:100%;justify-content:space-between}.homework-meta{flex-direction:column;gap:4px}.homework-heading h2{font-size:24px}.homework-actions .btn{font-size:12px;padding:9px 12px}}