:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;--weight-body:300;--weight-emphasis:400;--ink:#24354a;--ink-strong:#1b2b40;--muted:#536a83;--surface:#fff;--ground:#edf3f9;--line:#d8e2ed;--line-soft:#e6edf4;--accent:#2869b0;--accent-strong:#1e5592;--accent-soft:#eaf2fc;--rail:#152d4b;--rail-muted:#b3c5d9;--rail-current:#294867;--success:#256b53;--success-bg:#edf6f1;--danger:#a03831;--danger-bg:#fff2ef;--toast-bg:#e8f5bc;--toast-ink:#344717;--radius:8px;--panel-radius:12px;--space:8px;color:var(--ink);background:var(--ground);font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:14px;font-weight:var(--weight-body);font-synthesis:none;line-height:1.6}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}*{box-sizing:border-box;corner-shape:squircle}.avatar,.status-dot{corner-shape:round}html{scrollbar-color:#b5c6d8 transparent;min-width:320px}body{min-width:320px;margin:0}button,input,textarea,select{font:inherit}button{cursor:pointer}button,a{-webkit-tap-highlight-color:#d7e7f8;touch-action:manipulation}button:disabled{cursor:not-allowed}button,a,input,select,textarea{transition:background-color .15s,border-color .15s,color .15s}a{color:var(--accent);text-underline-offset:4px}a:hover{color:var(--accent-strong)}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,[tabindex="-1"]:focus-visible{outline-offset:3px;outline:3px solid #78a8dd}::selection{color:#173e68;background:#cce1f7}strong,b{font-weight:var(--weight-emphasis)}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--ink-strong);text-wrap:balance}h1{font-size:28px;font-weight:var(--weight-emphasis);letter-spacing:-.02em;margin-bottom:8px;line-height:1.35}h2{font-size:20px;font-weight:var(--weight-emphasis);margin-bottom:16px;line-height:1.4}h3{font-size:16px;line-height:1.5;font-weight:var(--weight-emphasis);margin-bottom:10px}small{color:var(--muted);font-size:12px;line-height:1.6}svg{vertical-align:middle;flex-shrink:0}.muted{color:var(--muted)}.visually-hidden{clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.skip-link{border-radius:var(--radius);z-index:100;color:var(--accent);background:#fff;padding:12px 18px;position:fixed;top:-100px;left:20px}.skip-link:focus{top:16px}.button{border-radius:var(--radius);color:#37516d;background:var(--surface);min-height:42px;font-size:13px;font-weight:var(--weight-emphasis);white-space:nowrap;border:1px solid #bdcddd;justify-content:center;align-items:center;gap:8px;padding:9px 16px;text-decoration:none;display:inline-flex}.button:hover:enabled{color:#204e80;background:#f4f8fc;border-color:#87a7c8}.button:active:enabled{background:#e6eff9}.button.primary{color:#fff;background:var(--accent);border-color:var(--accent)}.button.primary:hover:enabled{background:var(--accent-strong);border-color:var(--accent-strong)}.button.primary:active:enabled{background:#17477d}.button:disabled{color:#6d7d8e;background:#f0f4f8;border-color:#dce4ec}.button-small{min-height:36px;padding:7px 11px;font-size:12px}.button.danger{color:#fff;border-color:var(--danger);background:var(--danger)}.button.danger:hover:enabled{background:#832a25;border-color:#832a25}.icon-button{width:36px;min-height:36px;color:var(--muted);background:0 0;border:1px solid #0000;border-radius:7px;flex-shrink:0;justify-content:center;align-items:center;padding:7px;display:inline-flex}.icon-button:hover:enabled{color:var(--accent);background:var(--accent-soft)}.icon-button:disabled{color:#a6b2bf;opacity:.8}.text-button{min-height:36px;color:var(--accent);background:0 0;border:0;border-radius:5px;justify-content:center;align-items:center;gap:6px;padding:6px 3px;font-size:13px;text-decoration:none;display:inline-flex}.text-button:hover:enabled{color:var(--accent-strong);background:var(--accent-soft)}.text-button:disabled{color:#8292a4}.danger-quiet{color:var(--danger)}.danger-quiet:hover:enabled{background:var(--danger-bg);color:#842c27}.button-row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.notice{border:1px solid var(--line);border-radius:var(--radius);overflow-wrap:anywhere;align-items:flex-start;gap:9px;margin:0 0 22px;padding:12px 15px;font-size:13px;line-height:1.6;display:flex}.notice svg{margin-top:2px}.notice.success{color:var(--success);background:var(--success-bg);border-color:#cce4d8}.notice.error{color:var(--danger);background:var(--danger-bg);border-color:#efccc5}.notice.info{color:#315c8e;background:#edf4fc;border-color:#d1e1f3}.success-toast{z-index:100;background:var(--toast-bg);min-width:220px;max-width:min(420px,100vw - 32px);color:var(--toast-ink);border-radius:18px;align-items:center;gap:10px;padding:10px 12px 10px 16px;font-size:13px;line-height:1.6;animation:3s linear both toast-cycle;display:flex;position:fixed;top:20px;right:24px;box-shadow:0 4px 18px #152d4b22}.success-toast.is-dismissing{animation:.18s ease-out both toast-dismiss}.success-toast>svg{color:inherit}.success-toast>span{overflow-wrap:anywhere;flex:1;min-width:0}.success-toast .icon-button{width:30px;min-height:30px;color:inherit;padding:5px}.success-toast .icon-button:hover{color:inherit;background:#0000000a}@keyframes toast-cycle{0%,to{opacity:0}7%,93%{opacity:1}}@keyframes toast-dismiss{0%{opacity:1}to{opacity:0}}.inline-error p{color:var(--danger);overflow-wrap:anywhere;margin-bottom:10px}.status-tag{min-height:25px;color:var(--success);background:var(--success-bg);white-space:nowrap;font-size:11px;font-weight:var(--weight-emphasis);border-radius:5px;flex-shrink:0;align-items:center;gap:5px;padding:3px 8px;display:inline-flex}.status-tag.neutral{color:#566c84;background:#edf1f6}.wordmark{font-size:18px;font-weight:var(--weight-emphasis);white-space:nowrap;letter-spacing:-.02em;align-items:center;gap:10px;text-decoration:none;display:inline-flex}.brand-symbol{border-radius:7px;flex-shrink:0;place-items:center;width:34px;height:36px;display:grid}.application-shell{grid-template-columns:220px minmax(0,1fr);min-height:100dvh;display:grid}.app-sidebar{background:var(--rail);flex-direction:column;align-self:start;height:100dvh;min-height:100dvh;padding:30px 20px 20px;display:flex;position:sticky;top:0}.app-sidebar>.wordmark{color:#f3f7fd;padding:0 6px}.app-sidebar .brand-symbol{color:#f0f6ff;background:#2d4d6e}.primary-nav{gap:7px;margin-top:48px;display:grid}.nav-item{border-radius:var(--radius);width:100%;min-height:44px;color:var(--rail-muted);text-align:left;background:0 0;border:0;align-items:center;gap:12px;padding:11px 14px;font-size:14px;text-decoration:none;display:flex}.nav-item:hover{color:#f3f8ff;background:#213f5e}.nav-item.is-current{background:var(--rail-current);color:#fff;font-weight:var(--weight-emphasis)}.sidebar-bottom{margin-top:auto;padding-top:60px}.sidebar-account{border-top:1px solid #3b506b;align-items:center;gap:5px;margin-top:20px;padding:20px 0 0;display:flex}.account-shortcut{text-align:left;color:#f3f7ff;background:0 0;border:0;border-radius:6px;flex:1;align-items:center;gap:10px;min-width:0;padding:3px;display:flex}.account-shortcut:hover{background:#213f5e}.avatar{color:#e2efff;width:34px;height:34px;font-size:13px;font-weight:var(--weight-emphasis);background:#355374;border-radius:50%;flex-shrink:0;place-items:center;display:grid}.account-identity{min-width:0;display:block}.account-identity strong{font-size:13px;font-weight:var(--weight-emphasis);text-overflow:ellipsis;white-space:nowrap;display:block;overflow:hidden}.account-identity small{color:var(--rail-muted);margin-top:3px;font-size:11px;display:block}.logout-button{color:var(--rail-muted)}.logout-button:hover:enabled{color:#fff;background:#294867}.app-body{min-width:0}.workspace-topbar{background:var(--surface);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:20px;min-height:76px;padding:16px 36px;display:flex}.breadcrumb{color:var(--muted);align-items:center;gap:12px;font-size:13px;display:flex}.breadcrumb strong{color:#3b5068;font-weight:var(--weight-emphasis)}.workspace-user{text-overflow:ellipsis;white-space:nowrap;max-width:180px;color:var(--muted);font-size:13px;overflow:hidden}.workspace-main{min-width:0;padding:34px 36px 50px}.page-heading{justify-content:space-between;align-items:center;gap:20px;margin-bottom:26px;display:flex}.page-heading p{color:var(--muted);margin:0;font-size:13px}.library-toolbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:18px;margin-bottom:24px;display:flex}.segmented-control{border-radius:var(--radius);background:#e2eaf3;gap:4px;padding:4px;display:inline-flex}.segmented-control button{color:#50657f;white-space:nowrap;background:0 0;border:0;border-radius:5px;justify-content:center;align-items:center;gap:8px;min-height:34px;padding:6px 12px;font-size:13px;display:inline-flex}.segmented-control button:hover:enabled{color:#285f99;background:#edf3fa}.segmented-control button[aria-pressed=true]{color:var(--accent-strong);background:var(--surface);font-weight:var(--weight-emphasis);box-shadow:0 1px 3px #152d4b12}.segmented-control button:disabled{opacity:.6}.filter-count{font-variant-numeric:tabular-nums;min-width:14px;font-size:11px}.search-field{border-radius:var(--radius);width:264px;height:42px;color:var(--muted);background:#fff;border:1px solid #cad8e7;align-items:center;gap:10px;padding:0 12px;display:flex}.search-field:focus-within{outline-offset:1px;border-color:#78a8dd;outline:2px solid #c9dff7}.search-field input{width:100%;min-width:0;color:var(--ink);background:0 0;border:0;outline:0;padding:8px 0;font-size:12px}.search-field .icon-button{width:25px;min-height:28px;padding:3px}.search-field input::-webkit-search-cancel-button{display:none}.course-workarea{grid-template-columns:minmax(0,1fr) 420px;align-items:start;gap:24px;display:grid}.course-index{background:var(--surface);border:1px solid var(--line);border-radius:var(--panel-radius);min-width:0;overflow:hidden}.index-heading{border-bottom:1px solid var(--line-soft);justify-content:space-between;align-items:center;gap:16px;min-height:65px;padding:20px 22px;display:flex}.index-heading h2{margin:0;font-size:14px}.count-label{color:var(--muted);font-variant-numeric:tabular-nums;font-size:12px}.course-list{margin:0;padding:0;list-style:none}.course-list li+li{border-top:1px solid var(--line-soft)}.course-row{width:100%;min-height:106px;color:var(--ink);text-align:left;content-visibility:auto;contain-intrinsic-size:auto 106px;background:#fff;border:0;align-items:center;gap:14px;padding:24px 22px;display:flex}.course-row:hover:enabled{background:#f6f9fd}.course-row.is-selected{background:var(--accent-soft)}.course-row.is-selected:hover:enabled{background:#e3eefb}.course-row:disabled{opacity:.7}.course-row:focus-visible{outline-offset:-4px}.course-symbol{width:38px;height:44px;color:var(--accent);background:#eaf0f7;border-radius:6px;flex-shrink:0;place-items:center;display:grid}.course-row.is-selected .course-symbol{background:#dbe9fa}.course-description{flex:1;min-width:0}.course-description strong{font-size:16px;font-weight:var(--weight-emphasis);overflow-wrap:anywhere;line-height:1.5;display:block}.course-description>span{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;margin-top:5px;font-size:12px;line-height:1.6;display:block;overflow:hidden}.index-footer{border-top:1px solid var(--line-soft);min-height:60px;color:var(--muted);justify-content:space-between;align-items:center;gap:8px;padding:12px 18px 12px 22px;font-size:11px;display:flex}.pagination{gap:4px;display:flex}.rotate-icon{display:inline-flex;transform:rotate(180deg)}.index-empty{text-align:center;color:#7590ab;padding:62px 26px 66px}.index-empty h3{color:#506982;margin-top:18px;font-size:15px}.index-empty p{max-width:28ch;color:var(--muted);margin:0 auto 16px;font-size:13px;line-height:1.8}.detail-region{min-width:0}.detail-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--panel-radius);min-width:0;padding:26px}.detail-heading{justify-content:space-between;align-items:center;gap:14px;display:flex}.course-detail-title{letter-spacing:-.02em;overflow-wrap:anywhere;margin:23px 0 9px;font-size:24px;line-height:1.45}.last-edited{color:var(--muted);margin:0 0 20px;font-size:11px}.detail-tabs{border-bottom:1px solid var(--line-soft);gap:24px;margin:21px 0 23px;display:flex}.detail-tabs button{min-height:44px;color:var(--muted);background:0 0;border:0;border-bottom:2px solid #0000;align-items:center;gap:8px;padding:0 0 12px;font-size:13px;display:inline-flex}.detail-tabs button:hover{color:var(--accent)}.detail-tabs button[aria-selected=true]{color:var(--accent);border-bottom-color:var(--accent);font-weight:var(--weight-emphasis)}.detail-tabs button span{color:var(--muted);font-variant-numeric:tabular-nums;font-size:11px}.course-metadata{grid-template-columns:65px minmax(0,1fr);gap:17px 12px;margin:0 0 27px;font-size:13px;line-height:1.85;display:grid}.course-metadata dt{color:var(--muted)}.course-metadata dd{overflow-wrap:anywhere;margin:0}.learning-goal{white-space:pre-wrap;max-width:70ch}.goal-description{margin-top:6px;font-size:11px;display:block}.legacy-goal{color:var(--muted);font-size:12px;font-weight:var(--weight-body)}.legacy-goal summary{cursor:pointer;padding:4px 0}.legacy-goal p{white-space:pre-wrap;overflow-wrap:anywhere;margin:8px 0 0}.section-heading{justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px;display:flex}.section-heading h3{margin:0;font-size:15px}.course-materials{border-top:1px solid var(--line-soft);padding-top:23px}.detail-tabs+[role=tabpanel]>.course-materials:first-child{border-top:0;padding-top:0}.file-list{margin:0;padding:0;list-style:none}.file-list li{border-bottom:1px solid var(--line-soft);align-items:center;gap:10px;padding:15px 0;display:flex}.file-symbol{color:#6486aa;flex-shrink:0;width:26px}.file-description{flex:1;min-width:0}.file-name{overflow-wrap:anywhere;font-size:12px;line-height:1.6;display:block}.file-description small{margin-top:2px;font-size:11px;display:block}.file-actions{flex-shrink:0;align-items:center;gap:2px;display:flex}.file-actions .text-button{gap:4px;padding:5px 3px;font-size:12px}.file-actions .icon-button{width:28px}.files-empty{text-align:center;color:#6b8bab;padding:24px 8px 22px}.files-empty p{color:var(--muted);margin:9px 0 3px;font-size:13px}.files-empty small{font-size:12px}.upload-form{gap:11px;padding-top:20px;display:grid}.upload-label{font-size:12px;font-weight:var(--weight-emphasis);color:#4d637c}.file-picker-row{align-items:center;gap:10px;min-width:0;display:flex}.upload-form .file-picker{flex-shrink:0;min-height:36px;padding:7px 11px;font-size:12px;position:relative}.file-picker:focus-within{outline-offset:3px;outline:3px solid #78a8dd}.file-picker.is-disabled{cursor:not-allowed;opacity:.6}.upload-form .file-input{opacity:0;clip-path:inset(50%);border:0;width:1px;height:1px;padding:0;position:absolute}.selected-file-name{text-overflow:ellipsis;white-space:nowrap;min-width:0;color:var(--muted);font-size:11px;overflow:hidden}.upload-form input[type=file]{color:var(--muted);background:#f7f9fc;max-width:100%;padding:5px;font-size:11px}input[type=file]::file-selector-button{color:#3d5e81;font:inherit;cursor:pointer;background:#e7eef7;border:0;border-radius:4px;margin-right:8px;padding:8px 10px}input[type=file]::file-selector-button:hover{background:#dae8f8}.upload-bottom{justify-content:space-between;align-items:center;gap:10px;display:flex}.upload-bottom small{font-size:11px}.detail-bottom{border-top:1px solid var(--line-soft);margin-top:26px;padding-top:15px}.detail-bottom>button{font-size:12px}.delete-confirmation{border-radius:var(--radius);background:#fff6f3;border:1px solid #eccac4;margin-top:12px;padding:18px}.delete-confirmation h3{color:var(--danger);margin-bottom:7px;font-size:14px}.delete-confirmation p{color:#8a4e47;overflow-wrap:anywhere;font-size:12px}.detail-placeholder{text-align:center;border-radius:var(--panel-radius);color:#6d89a5;border:1px dashed #c3d1e0;min-height:390px;padding:88px 25px}.placeholder-book{background:#e2ebf5;border-radius:16px;place-items:center;width:66px;height:66px;display:inline-grid}.detail-placeholder h2{color:#4e6782;margin:22px 0 12px;font-size:17px}.detail-placeholder p{color:var(--muted);margin:0;font-size:13px;line-height:1.9}.panel-heading{justify-content:space-between;align-items:center;gap:12px;display:flex}.panel-heading h2{margin:0;font-size:20px}.panel-description{color:var(--muted);margin:10px 0 26px;font-size:12px}.form-stack{gap:21px;display:grid}.form-stack label,.field-group{font-size:13px;font-weight:var(--weight-emphasis);color:#3d526b;gap:8px;min-width:0;display:grid}.form-stack input,.form-stack textarea,.form-stack select,.upload-form input{border-radius:var(--radius);width:100%;min-width:0;color:var(--ink);caret-color:var(--accent);font-weight:var(--weight-body);background:#fff;border:1px solid #c7d5e4;padding:11px 12px;font-size:13px;display:block}.form-stack input:hover,.form-stack textarea:hover,.form-stack select:hover{border-color:#95aec9}.form-stack input:focus-visible,.form-stack textarea:focus-visible,.form-stack select:focus-visible{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent);outline:none}input::placeholder,textarea::placeholder{color:#60748b;opacity:1}.form-stack textarea{resize:vertical;min-height:130px;line-height:1.8}.field-pair{grid-template-columns:1fr 1fr;gap:14px;display:grid}.required{float:right;color:var(--muted);font-size:10px;font-weight:var(--weight-body);display:inline}.form-stack label:has(>.required){display:block}.form-stack label:has(>.required)>input{margin-top:8px}.editor-actions{border-top:1px solid var(--line-soft);gap:10px;margin-top:6px;padding-top:20px;display:flex}.editor-actions .primary{flex:1}.settings-page{max-width:960px}.settings-section{border:1px solid var(--line);border-radius:var(--panel-radius);background:#fff;grid-template-columns:minmax(180px,.75fr) minmax(0,1.25fr);gap:36px;margin-bottom:22px;padding:30px;display:grid}.settings-description h2{margin-bottom:10px;font-size:17px}.settings-description p{color:var(--muted);margin:0;font-size:12px;line-height:1.9}.read-only-field{font-size:13px;font-weight:var(--weight-body);overflow-wrap:anywhere;justify-content:space-between;align-items:center;gap:12px;padding:12px 0;display:flex}.field-label{color:#3d526b;font-size:13px}.entry-shell{background:#f5f8fc;min-height:100dvh;padding:0 36px 48px}.entry-header{justify-content:space-between;align-items:center;gap:24px;width:min(1180px,100%);min-height:100px;margin:auto;display:flex}.entry-header .wordmark{color:var(--ink-strong)}.entry-header .brand-symbol{background:var(--rail);color:#fff}.quiet-link{color:var(--muted);align-items:center;gap:7px;font-size:13px;text-decoration:none;display:inline-flex}.quiet-link:hover{color:var(--accent)}.entry-main{border:1px solid var(--line);background:#fff;border-radius:16px;grid-template-columns:.95fr 1.05fr;width:min(1180px,100%);min-height:660px;margin:32px auto;display:grid;overflow:hidden}.entry-form-region{align-items:center;min-width:0;padding:56px 60px;display:flex}.account-panel{width:100%;max-width:390px;margin-inline:auto}.account-description{color:var(--muted);margin-bottom:25px;font-size:13px}.account-tabs{margin-bottom:27px;display:flex}.account-tabs button{flex:1;min-height:36px}.label-row{justify-content:space-between;align-items:center;gap:16px;display:flex}.label-row .text-button{min-height:24px;padding:0 3px;font-size:11px}.account-panel .field-group{gap:8px}.account-panel .field-group small{font-size:11px;font-weight:var(--weight-body)}.account-submit{justify-content:space-between;width:100%;margin-top:4px;padding-inline:18px}.account-links{border-top:1px solid var(--line-soft);flex-wrap:wrap;gap:2px 20px;margin-top:24px;padding-top:16px;display:flex}.account-links .text-button{color:var(--muted);font-size:11px}.account-links .text-button:hover{color:var(--accent)}.skeleton{background:#e8eef5;border-radius:4px;width:100%;height:15px}.skeleton-title{width:48%;height:28px}.skeleton-short{width:65%;height:10px;margin-top:12px}.skeleton-square{width:38px;height:44px}.course-skeleton{padding:2px 22px}.skeleton-row{grid-template-columns:38px 1fr;align-items:center;gap:15px;padding:27px 0;display:grid}.skeleton-row+.skeleton-row{border-top:1px solid var(--line-soft)}.file-skeleton{gap:18px;padding:15px 0 25px;display:grid}.account-skeleton{gap:40px;width:100%;max-width:390px;margin:auto;display:grid}.status-page{max-width:820px}.status-panel{border:1px solid var(--line);border-radius:var(--panel-radius);background:#fff;overflow:hidden}.status-heading{border-bottom:1px solid var(--line-soft);justify-content:space-between;align-items:center;gap:20px;padding:25px;display:flex}.status-message{color:#38536e;align-items:center;gap:10px;font-size:15px;display:flex}.status-dot{background:#8194a7;border-radius:50%;flex-shrink:0;width:8px;height:8px}.status-dot.good{background:#2c7d5d}.status-dot.warning{background:#a97a20}.status-heading button{border-radius:var(--radius);color:var(--accent);background:#fff;border:1px solid #bdcddd;min-height:40px;padding:9px 16px;font-size:13px}.status-heading button:hover:enabled{background:var(--accent-soft)}.status-heading button:disabled{color:#7a8b9d}.service-list{margin:0;padding:5px 25px}.service-row{justify-content:space-between;gap:20px;padding:21px 0;font-size:13px;display:flex}.service-row+.service-row{border-top:1px solid var(--line-soft)}.service-row dd{color:var(--muted);margin:0}@media (min-width:1600px){.workspace-main{max-width:1440px;margin-inline:auto;padding-inline:48px}.course-workarea{grid-template-columns:minmax(0,1fr) 460px;gap:30px}}@media (max-width:1180px){.application-shell{grid-template-columns:190px minmax(0,1fr)}.app-sidebar{padding-inline:15px}.app-sidebar .wordmark{gap:8px;padding-inline:0;font-size:16px}.app-sidebar .brand-symbol{width:30px}.workspace-topbar{padding-inline:26px}.workspace-main{padding:29px 26px 45px}.course-workarea{grid-template-columns:minmax(0,1fr) 360px;gap:20px}.detail-panel{padding:22px}.course-row{gap:11px;padding:22px 18px}.course-description strong{font-size:15px}.course-row .status-tag{padding-inline:6px;font-size:10px}.entry-form-region{padding:45px}.settings-section{grid-template-columns:170px minmax(0,1fr);gap:25px}}@media (max-width:940px){.application-shell{grid-template-columns:1fr}.app-sidebar{grid-template-columns:1fr auto;grid-template-areas:"brand account""navigation navigation";align-self:stretch;gap:18px 20px;height:auto;min-height:0;padding:20px 26px 14px;display:grid;position:static}.app-sidebar>.wordmark{grid-area:brand;font-size:18px}.primary-nav{grid-area:navigation;gap:8px;margin:0;display:flex}.primary-nav .nav-item{width:auto;min-width:145px;padding-inline:16px}.sidebar-bottom{grid-area:account;align-items:center;gap:10px;margin:0;padding:0;display:flex}.sidebar-bottom>.nav-item{width:auto;min-height:36px;padding:8px}.sidebar-bottom>.nav-item>span{display:none}.sidebar-account{border:0;gap:8px;margin:0;padding:0}.account-identity{display:none}.account-shortcut{flex:0;padding:0}.workspace-topbar{min-height:58px}.workspace-main{padding-top:28px}.entry-shell{padding-inline:28px}.entry-main{grid-template-columns:.85fr 1.15fr}.entry-form-region{padding:40px 32px}}@media (max-width:740px){.success-toast{min-width:0;max-width:none;top:12px;left:12px;right:12px}.app-sidebar{gap:16px 8px;padding:18px 20px 12px}.app-sidebar>.wordmark{gap:8px;font-size:16px}.app-sidebar .brand-symbol{width:30px;height:32px}.sidebar-bottom{gap:4px}.sidebar-account{gap:3px}.sidebar-account .avatar{width:30px;height:30px;font-size:12px}.sidebar-bottom>.nav-item{padding:8px 5px}.sidebar-account .icon-button{width:30px;padding:6px}.primary-nav .nav-item{flex:1;justify-content:center;min-width:0;min-height:44px;padding:10px;font-size:13px}.workspace-topbar{min-height:54px;padding:12px 20px}.workspace-user{max-width:100px;font-size:11px}.breadcrumb{gap:8px;font-size:11px}.workspace-main{padding:27px 20px 40px}h1{font-size:25px}.page-heading{align-items:flex-start;gap:12px;margin-bottom:24px}.page-heading p{max-width:24ch;font-size:12px}.page-heading>.button{min-height:42px;padding-inline:12px;font-size:12px}.page-heading>.button svg{width:16px}.library-toolbar{gap:15px;margin-bottom:20px}.search-field,.segmented-control{width:100%}.course-filters button{flex:1;min-height:36px;padding:7px 10px}.course-workarea{grid-template-columns:1fr;gap:24px}.detail-placeholder{display:none}.course-row{min-height:96px;padding:20px 18px}.course-row .status-tag{padding-inline:8px;font-size:11px}.course-symbol{width:34px;height:40px}.index-heading{min-height:60px;padding:18px}.detail-panel{padding:23px}.course-detail-title{font-size:23px}.field-pair{grid-template-columns:1fr 1fr;gap:12px}.course-metadata{grid-template-columns:62px minmax(0,1fr);gap:17px 10px}.settings-section{grid-template-columns:1fr;gap:22px;padding:24px}.settings-description p br{display:none}.settings-page .read-only-field{gap:6px;font-size:12px}.entry-shell{padding:0 20px 35px}.entry-header{gap:12px;min-height:86px}.entry-header .wordmark{gap:8px;font-size:16px}.entry-header .quiet-link{font-size:11px}.entry-main{max-width:470px;min-height:0;margin:18px auto;display:block}.entry-form-region{min-height:520px;padding:35px 26px 32px}.account-panel h1{font-size:26px}.account-links{gap:5px 15px}.notice{font-size:12px}.status-heading{flex-direction:column;align-items:flex-start;padding:22px}.service-list{padding-inline:22px}}@media (max-width:370px){.workspace-main,.workspace-topbar,.app-sidebar{padding-inline:16px}.app-sidebar>.wordmark{gap:6px;font-size:15px}.sidebar-bottom>.nav-item{padding-inline:2px}.sidebar-account .icon-button{width:27px}.detail-panel{padding:20px}.field-pair{grid-template-columns:1fr}.file-actions .text-button>span{display:none}.file-actions .text-button{width:30px}.upload-bottom{flex-wrap:wrap}.entry-form-region{padding-inline:21px}}html,body{height:100%;overflow:hidden}.application-shell{height:100dvh;min-height:0;overflow:hidden}.app-sidebar{min-height:0}.app-body{flex-direction:column;min-height:0;display:flex;overflow:hidden}.workspace-topbar{flex-shrink:0;min-height:56px;padding:12px 24px}.workspace-main{flex-direction:column;flex:1;width:100%;min-height:0;padding:20px 24px;display:flex;overflow:hidden}.course-space{flex-direction:column;flex:1;min-height:0;display:flex}.page-heading{flex-shrink:0;margin-bottom:16px}.page-heading h1{font-size:25px}.library-toolbar{flex-shrink:0;margin-bottom:16px}.notice{flex-shrink:0;max-height:95px;margin-bottom:12px;overflow:auto}.course-workarea{flex:1;align-items:stretch;min-height:0}.course-index{flex-direction:column;min-height:0;display:flex}.index-heading{flex-shrink:0;min-height:52px;padding:14px 20px}.course-list{overscroll-behavior:contain;flex:1;min-height:0;overflow:auto}.course-row{contain-intrinsic-size:auto 88px;min-height:88px;padding:18px 20px}.course-skeleton,.index-empty{flex:1;min-height:0;overflow:auto}.index-empty{padding:28px 22px}.index-footer{flex-shrink:0;min-height:44px;padding:4px 14px 4px 20px}.detail-region{flex-direction:column;min-height:0;display:flex}.detail-back{display:none}.detail-panel{flex-direction:column;flex:1;min-height:0;padding:20px;display:flex;overflow:hidden}.detail-heading,.panel-heading,.panel-description,.detail-tabs,.last-edited,.course-detail-title{flex-shrink:0}.course-detail-title{-webkit-line-clamp:2;-webkit-box-orient:vertical;margin:12px 0 4px;font-size:22px;display:-webkit-box;overflow:hidden}.last-edited{margin-bottom:6px}.detail-tabs{margin:10px 0 14px}#course-tab-panel{overscroll-behavior:contain;flex:1;min-height:0;padding:3px;overflow:auto}.course-metadata{margin-bottom:0}.course-materials{border-top:0;flex-direction:column;height:100%;min-height:0;padding-top:0;display:flex}.course-materials>.section-heading{clip-path:inset(50%);width:1px;height:1px;position:absolute;overflow:hidden}.section-heading,.upload-form{flex-shrink:0}.file-list{overscroll-behavior:contain;flex:1;min-height:0;overflow:auto}.file-skeleton,.files-empty{flex:1;min-height:0;overflow:auto}.upload-form{gap:8px;padding-top:12px}.upload-form>small{font-size:11px}.file-picker-row .selected-file-name{flex:1}.file-picker-row>button{flex-shrink:0}.detail-bottom{flex-shrink:0;margin-top:12px;padding-top:8px}.delete-confirmation{flex-shrink:0;max-height:45%;padding:14px;overflow:auto}.detail-placeholder{height:100%;min-height:0;padding:35px 20px;overflow:auto}.panel-description{margin:8px 0 14px}.editor-panel .form-stack{flex-direction:column;flex:1;gap:0;min-height:0;display:flex}.editor-fields{overscroll-behavior:contain;gap:12px;min-height:0;padding:3px;display:grid;overflow:auto}.editor-actions{flex-shrink:0;margin-top:auto;padding-top:12px}.editor-fields+.editor-actions{margin-top:12px}.editor-fields label,.editor-fields .field-group{gap:6px}.editor-fields input,.editor-fields select{padding:8px 10px}.editor-fields label:has(>.required)>input{margin-top:6px}.settings-page{flex-direction:column;width:100%;max-width:850px;min-height:0;display:flex}.settings-tabs{flex-shrink:0;align-self:flex-start;margin-bottom:16px}.settings-tabs button{min-width:120px}.settings-section{gap:24px;min-height:0;margin:0;padding:22px;overflow:auto}.settings-section .form-stack{gap:14px}.status-page{min-height:0;overflow:auto}.entry-shell{grid-template-rows:64px minmax(0,1fr);height:100dvh;min-height:0;padding:0 24px 16px;display:grid;overflow:hidden}.entry-header{width:100%;max-width:1180px;height:64px;min-height:0}.entry-main{overscroll-behavior:contain;align-self:center;width:min(440px,100%);min-height:0;max-height:100%;margin:0 auto;display:block;overflow:auto}.entry-form-region{min-height:0;padding:24px 30px}.account-panel h1{margin-bottom:5px;font-size:25px}.account-description,.account-tabs{margin-bottom:14px}.account-panel .form-stack{gap:12px}.account-panel .form-stack label,.account-panel .field-group{gap:5px}.account-panel .form-stack input{padding:8px 11px}.account-links{gap:2px 16px;margin-top:14px;padding-top:8px}.account-panel .notice{margin-bottom:12px}@media (max-width:940px){.application-shell{grid-template-rows:auto minmax(0,1fr)}.app-sidebar{gap:10px 16px;padding:12px 20px 10px}.app-sidebar .brand-symbol{height:30px}.primary-nav .nav-item{min-height:40px;padding-block:8px}.workspace-topbar{display:none}}@media (max-width:740px){.workspace-main{padding:16px}.page-heading{margin-bottom:12px}.library-toolbar{gap:10px;margin-bottom:12px}.course-workarea{grid-template-columns:1fr;gap:0}.course-space:not(.showing-detail) .detail-region,.showing-detail .page-heading,.showing-detail .library-toolbar,.showing-detail .course-index{display:none}.detail-back{flex-shrink:0;align-self:flex-start;min-height:32px;margin-bottom:8px;display:inline-flex}.detail-panel{padding:16px}.detail-placeholder{display:none}.course-row{min-height:84px;padding:16px}.settings-section{grid-template-columns:1fr;gap:14px;padding:18px}.settings-tabs{width:auto}.settings-description h2{margin-bottom:5px}.settings-description p{line-height:1.6}.settings-section input{padding:8px 10px}.entry-shell{padding-inline:16px}.entry-header{gap:12px}.entry-main{margin:0 auto}.entry-form-region{min-height:0;padding:22px 24px}.account-panel h1{font-size:25px}}@media (max-height:680px){.entry-shell{grid-template-rows:56px minmax(0,1fr);padding-bottom:12px}.entry-header{height:56px}.entry-form-region{padding-block:18px}.account-description{display:none}.account-tabs{margin-top:12px;margin-bottom:12px}.account-panel .form-stack{gap:10px}.account-panel .notice{padding-block:8px}.workspace-main{padding-block:12px}.panel-description{display:none}.panel-heading{margin-bottom:12px}.course-detail-title{margin-top:8px;font-size:20px;line-height:1.4}.last-edited{display:none}.detail-tabs{margin:8px 0 10px}.detail-tabs button{min-height:36px;padding-bottom:8px}}@media (min-width:2400px){.application-shell{grid-template-columns:260px minmax(0,1fr)}.app-sidebar{padding:36px 24px 28px}.app-sidebar .wordmark{font-size:20px}.nav-item{min-height:48px;padding:14px 18px;font-size:16px}.workspace-topbar{min-height:80px;padding:20px 48px}.workspace-main{max-width:2400px;padding:40px 48px}.page-heading{margin-bottom:28px}.page-heading h1{font-size:34px}.page-heading p{font-size:16px}.library-toolbar{margin-bottom:28px}.course-workarea{grid-template-columns:minmax(0,1fr) minmax(560px,36%);gap:32px}.search-field{width:380px;height:48px}.search-field input{font-size:14px}.button{min-height:46px;padding:11px 20px;font-size:15px}.segmented-control button{min-height:40px;padding-inline:18px;font-size:15px}.index-heading{min-height:76px;padding:24px 32px}.index-heading h2{font-size:18px}.count-label,.index-footer{font-size:14px}.course-row{contain-intrinsic-size:auto 110px;gap:20px;min-height:110px;padding:28px 32px}.course-description strong{font-size:20px}.course-description>span{font-size:14px}.status-tag{font-size:13px}.detail-panel{padding:32px}.course-detail-title{margin-top:24px;font-size:28px}.detail-tabs{margin:24px 0}.detail-tabs button{min-height:48px;font-size:16px}.course-metadata{grid-template-columns:80px minmax(0,1fr);gap:22px 18px;font-size:16px}.panel-heading h2{font-size:24px}.panel-description{font-size:14px}.editor-fields{gap:22px}.form-stack label,.field-group{font-size:15px}.form-stack input,.form-stack select{padding:12px 14px;font-size:16px}.file-name,.file-actions .text-button{font-size:14px}.file-list li{padding:22px 0}.settings-page{max-width:1100px}.settings-section{padding:32px}.entry-header{max-width:2400px}.entry-main{width:520px}.entry-form-region{padding:40px 44px}.account-panel{max-width:none}.account-panel h1{font-size:32px}.account-panel .form-stack{gap:20px}.account-panel .form-stack input{padding:12px 14px;font-size:16px}.account-description,.account-links .text-button{font-size:14px}}@media (pointer:coarse){.button,.button-small,.icon-button,.text-button,.segmented-control button{min-height:44px}.file-actions .icon-button{width:36px}.search-field .icon-button{min-height:36px}}.account-page{flex-direction:column;flex:1;min-height:0;display:flex}.account-overview{flex-direction:column;align-self:center;align-items:center;width:100%;max-width:1260px;min-height:0;padding:clamp(16px,4vh,80px) 8px 24px;display:flex;overflow:auto}.profile-identity{text-align:center;flex-shrink:0;max-width:100%}.profile-avatar{corner-shape:round;background:var(--accent-soft);width:96px;height:96px;color:var(--accent);font-size:34px;font-weight:var(--weight-emphasis);border-radius:50%;place-items:center;margin:0 auto 20px;display:grid}.profile-identity h2{overflow-wrap:anywhere;margin:0 0 8px;font-size:28px;line-height:1.4}.profile-email{color:var(--muted);overflow-wrap:anywhere;margin:0;font-size:13px}.learning-statistics{border:1px solid var(--line);border-radius:var(--panel-radius);background:var(--surface);flex-shrink:0;grid-template-columns:repeat(5,minmax(0,1fr));width:100%;margin:36px 0 0;padding:22px 0;display:grid}.learning-statistics>div{text-align:center;flex-direction:column-reverse;gap:8px;min-width:0;padding:0 18px;display:flex}.learning-statistics>div+div{border-left:1px solid var(--line)}.learning-statistics dt{color:var(--muted);font-size:13px;line-height:1.6}.learning-statistics dd{color:var(--ink-strong);font-variant-numeric:tabular-nums;margin:0;font-size:28px;line-height:1.3}.statistics-note{color:var(--muted);margin:12px 0 0;font-size:12px}.profile-actions{flex-wrap:wrap;flex-shrink:0;justify-content:center;gap:14px;margin-top:30px;display:flex}.profile-actions>.button{min-width:140px}.action-state{font-size:11px;font-weight:var(--weight-body)}.profile-dialog{border:1px solid var(--line);border-radius:var(--panel-radius);background:var(--surface);width:min(400px,100vw - 32px);max-height:calc(100dvh - 48px);color:var(--ink);margin:0 auto;padding:24px;position:fixed;top:38.2%;transform:translateY(-38.2%)}.profile-dialog[open]{flex-direction:column;display:flex}.profile-dialog::backdrop{background:#0a162866}.profile-dialog .panel-heading{flex-shrink:0;margin-bottom:22px}.dialog-description{color:var(--muted);margin-bottom:20px;font-size:12px}.profile-dialog .form-stack{flex-direction:column;gap:0;min-height:0;display:flex}.dialog-fields{gap:18px;min-height:0;display:grid;overflow:auto}.dialog-actions{border-top:1px solid var(--line-soft);flex-shrink:0;justify-content:flex-end;gap:10px;margin-top:24px;padding-top:18px;display:flex}.test-login{width:100%;margin-top:10px}@media (min-width:2400px){.account-overview{max-width:1560px}.profile-avatar{width:160px;height:160px;margin-bottom:28px;font-size:54px}.profile-identity h2{margin-bottom:14px;font-size:40px}.profile-email{font-size:17px}.learning-statistics{margin-top:56px;padding-block:30px}.learning-statistics dt{font-size:17px}.learning-statistics dd{font-size:36px}.statistics-note{margin-top:18px;font-size:14px}.profile-actions{gap:20px;margin-top:40px}.profile-actions>.button{min-width:180px}}@media (max-width:740px){.account-overview{padding:10px 0 12px}.profile-avatar{width:64px;height:64px;margin-bottom:12px;font-size:25px}.profile-identity h2{font-size:24px}.profile-email{font-size:12px}.learning-statistics{margin-top:24px;padding-block:16px}.learning-statistics>div{gap:6px;padding-inline:6px}.learning-statistics dt{font-size:11px}.learning-statistics dd{font-size:23px}.statistics-note{font-size:11px}.profile-actions{gap:8px;width:100%;margin-top:22px}.profile-actions>.button{flex:1;min-width:0;padding-inline:12px;font-size:12px}.profile-actions .action-state{font-size:10px}.profile-dialog{padding:20px}}@media (max-width:370px){.profile-actions{flex-direction:column}.profile-actions>.button{width:100%}}@media (prefers-color-scheme:dark){:root{--ink:#fff;--ink-strong:#fff;--muted:#fff;--surface:#222;--ground:#181818;--line:#454545;--line-soft:#363636;--accent:#8dbbff;--accent-strong:#b3d2ff;--accent-soft:#263342;--rail:#191c1e;--rail-current:#2b2d2f;--rail-muted:#fff;--success:#fff;--success-bg:#233c31;--danger:#fff;--danger-bg:#42282b;--toast-bg:#425b25;--toast-ink:#fff}html{scrollbar-color:#858585 transparent}::selection{color:#fff;background:#33577e}a,a:hover,.quiet-link:hover,.text-button,.text-button:hover:enabled,.text-button:disabled,.account-links .text-button:hover,.icon-button:hover:enabled,.icon-button:disabled,.app-sidebar>.wordmark,.app-sidebar .brand-symbol,.account-shortcut,.avatar,.nav-item:hover,.course-symbol,.profile-avatar,.status-message,.status-heading button:disabled,.detail-tabs button:hover,.detail-tabs button[aria-selected=true]{color:#fff}.skip-link{color:#fff;background:#333}.entry-shell{background:var(--ground)}.entry-main,.course-row,.settings-section,.status-heading button{background:var(--surface)}.button,.status-heading button{color:var(--ink);border-color:#858585}.button:hover:enabled,.button:active:enabled{color:var(--ink-strong);background:#303030;border-color:#999}.button.primary,.button.primary:hover:enabled,.button.primary:active:enabled{color:#fff;background:#2869b0;border-color:#2869b0}.button.primary:hover:enabled,.button.primary:active:enabled{background:#1e5592;border-color:#1e5592}.button.danger,.button.danger:hover:enabled{color:#fff;background:#a03831;border-color:#a03831}.button.danger:hover:enabled{background:#832a25;border-color:#832a25}.button:disabled{border-color:var(--line);color:var(--muted);background:#2a2a2a}.nav-item:hover,.account-shortcut:hover,.logout-button:hover:enabled{background:#2b2d2f}.sidebar-account{border-color:var(--line)}.danger-quiet:hover:enabled{color:var(--danger)}.breadcrumb strong,.form-stack label,.field-group,.field-label,.upload-label{color:var(--ink)}.form-stack input,.form-stack textarea,.form-stack select,.search-field{background:#363636;border-color:#858585}.form-stack input:hover,.form-stack textarea:hover,.form-stack select:hover{border-color:#999}.form-stack input:focus-visible,.form-stack textarea:focus-visible,.form-stack select:focus-visible{border-color:var(--accent)}input::placeholder,textarea::placeholder{color:#fff;opacity:1}.segmented-control,.skeleton,.placeholder-book,.course-symbol{background:#2a2a2a}.segmented-control button{color:var(--muted)}.segmented-control button:hover:enabled{color:var(--ink);background:#383838}.segmented-control button[aria-pressed=true]{color:#fff}.segmented-control button:disabled{opacity:1}.course-row:hover:enabled{background:#2b2b2b}.course-row.is-selected,.course-row.is-selected:hover:enabled{background:var(--accent-soft)}.course-row.is-selected .course-symbol{background:#2c4c70}.status-tag.neutral{color:var(--muted);background:#303030}.index-empty h3,.detail-placeholder h2{color:var(--ink)}.detail-placeholder{color:var(--muted);border-color:#858585}.file-symbol,.files-empty,.index-empty{color:#fff}.notice.success{border-color:#476b55}.notice.error,.delete-confirmation{background:var(--danger-bg);border-color:#744449}.delete-confirmation p{color:var(--danger)}.notice.info{color:#fff;background:var(--accent-soft);border-color:#416183}.upload-form input[type=file]{background:#363636}input[type=file]::file-selector-button{color:var(--ink);background:#444}.profile-dialog::backdrop{background:#0008}}@media (prefers-reduced-motion:reduce){.success-toast,.success-toast.is-dismissing{animation:none}*,:before,:after{scroll-behavior:auto!important;transition:none!important}}:root{--ai-width:850px}.ai-page{width:100%;min-height:0;max-width:var(--ai-width);flex-direction:column;display:flex}.ai-toolbar{flex-shrink:0;margin-bottom:16px}.ai-toolbar label{gap:6px;max-width:420px;display:grid}.ai-page .settings-tabs{flex-wrap:wrap;gap:4px;display:flex}.ai-page .settings-tabs button{min-width:0}.ai-content{border:1px solid var(--line);background:var(--surface);border-radius:var(--panel-radius);flex-direction:column;flex:1;min-height:0;display:flex;overflow:hidden}.ai-fields{overscroll-behavior:contain;min-height:0;padding:24px;overflow:auto}.ai-fields.form-stack{flex-direction:column;gap:14px;display:flex}.ai-fields h2{margin:0;font-size:20px}.ai-fields h3{margin:0 0 10px;font-size:16px}.ai-fields p{margin-block:6px}.ai-page .field-hint{color:var(--muted);font-size:12px;line-height:1.6}.ai-page .danger-text{color:var(--danger)}.ai-actions{border-top:1px solid var(--line);flex-shrink:0;gap:12px;padding:16px 24px;display:flex}.ai-check{align-items:center;gap:8px;display:flex!important}.ai-check input{flex-shrink:0;width:18px;height:18px;margin:0;padding:0}.ai-capabilities{border:0;flex-direction:column;gap:10px;margin:0;padding:0;display:flex}.ai-capabilities legend{font-weight:var(--weight-emphasis);margin-bottom:10px}.ai-origins{color:var(--muted);overflow-wrap:anywhere;font-size:12px}.ai-origins summary{cursor:pointer}.ai-secondary-actions,.ai-test-buttons{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.ai-probes{border-top:1px solid var(--line);padding-top:18px}.ai-probes .text-button{margin-top:12px}.ai-empty{flex:initial;padding:24px}.ai-empty .button{align-self:flex-start}.ai-log-list{margin:16px 0 0;padding:0;list-style:none}.ai-log-list li{border-bottom:1px solid var(--line);overflow-wrap:anywhere;padding:14px 0}.ai-log-list li>div{justify-content:space-between;gap:16px;display:flex}.ai-log-list p{font-variant-numeric:tabular-nums;font-size:12px}@media (max-width:600px){.ai-fields{padding:16px}.ai-actions{padding:12px 16px}.ai-test-buttons .button{flex:140px}}@media (min-width:2400px){:root{--ai-width:1100px}.ai-fields{padding:32px}}