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*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}a{color:var(--navy)}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid var(--blue);outline-offset:3px}h1,h2,h3,p,figure{margin:0}h1,h2,h3{color:var(--navy)}h1{font-size:30px;line-height:1.2;letter-spacing:-.8px;font-weight:650}h2{font-size:18px;letter-spacing:-.2px;font-weight:650}h3{font-size:15px;font-weight:650}p{line-height:1.7}small,.small{font-size:12px;color:var(--muted)}.muted{color:var(--muted)}.eyebrow{display:block;color:var(--muted);font-size:11px;letter-spacing:1.4px;text-transform:uppercase;font-weight:600}.icon{width:20px;height:20px;flex-shrink:0;vertical-align:middle}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 15px;min-height:42px;border:1px solid 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.icon{width:21px;height:21px}.toast{position:fixed;left:50%;bottom:25px;transform:translateX(-50%);z-index:100;max-width:calc(100vw - 30px);background:var(--navy);color:white;padding:12px 22px;border-radius:9px;font-size:13px;box-shadow:0 7px 25px #012e5d25}.skip-link{position:fixed;top:-100px;left:10px;background:var(--navy);color:white;padding:10px;z-index:200}.skip-link:focus{top:10px}dialog{width:min(770px,calc(100vw - 30px));max-height:88vh;overflow:auto;border:1px solid var(--line);border-radius:17px;padding:0;color:var(--ink);background:#fff;box-shadow:0 25px 90px #012e5d30}dialog::backdrop{background:#102a4470;backdrop-filter:blur(3px)}.dialog-header{display:flex;align-items:center;gap:15px;padding:23px 26px;border-bottom:1px solid var(--line)}.dialog-header h2{flex:1}.dialog-body{padding:25px 26px}.dialog-footer{display:flex;justify-content:flex-end;gap:10px;padding:18px 26px;border-top:1px solid var(--line);flex-wrap:wrap}.dialog-body .stack{gap:17px}.dialog-body p{font-size:13px}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:17px}.dataset-choice{width:100%;display:flex;gap:13px;align-items:center;text-align:left;padding:17px;border:1px solid var(--line);border-radius:10px;background:#fff;margin:10px 0;color:var(--ink)}.dataset-choice:hover{background:var(--pale);border-color:var(--blue)}.dataset-choice strong{display:block;color:var(--navy);font-weight:600}.dataset-choice small{display:block;margin-top:4px}.dataset-choice .icon{color:var(--blue)}.dataset-choice>div{flex:1}.admin-nav{display:flex;flex-direction:column;gap:5px}.admin-nav .method-link{padding-left:13px;gap:12px}.admin-title{display:flex;align-items:center;gap:8px;padding:0 12px;font-weight:650;font-size:13px;color:var(--navy)}.admin-section-intro{color:var(--muted);font-size:13px;margin:10px 0 23px}.admin-editor-header{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:20px 0}.admin-editor-header h2{flex:1}.edit-tabs{display:flex;gap:8px;border-bottom:1px solid var(--line);margin:24px 0}.edit-tab{border:0;border-bottom:2px solid transparent;background:transparent;padding:12px 16px;color:var(--muted)}.edit-tab.active{color:var(--navy);border-bottom-color:var(--navy)}.editor-block{background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:16px;overflow:hidden}.block-toolbar{display:flex;align-items:center;gap:8px;padding:11px 15px;background:#fafbfd;border-bottom:1px solid var(--line);font-size:12px;font-weight:600;color:var(--navy)}.block-toolbar .actions{margin-left:auto;gap:2px}.block-toolbar .button{min-height:28px;padding:3px 7px}.block-body{padding:17px}.block-body .field+.field{margin-top:12px}.format-toolbar{display:flex;gap:4px;margin-bottom:6px}.format-toolbar button{min-width:28px;min-height:28px;padding:2px 7px;border:1px solid var(--line);background:#fff;color:var(--navy);border-radius:4px}.editor-actions{display:flex;align-items:center;gap:8px;padding:18px 0;margin-top:10px;flex-wrap:wrap}.editor-actions .field{min-width:180px}.save-bar{position:sticky;bottom:0;margin-top:25px;background:#f4f6f9f5;backdrop-filter:blur(12px);border-top:1px solid var(--line);padding:16px 0;display:flex;align-items:center;gap:10px;z-index:5;flex-wrap:wrap}.save-bar p{font-size:12px;color:var(--muted);flex:1}.graphic-editor{display:grid;grid-template-columns:minmax(0,1fr) 205px;gap:18px}.graphic-editor .lesson-graphic{border:1px dashed #c3d0de;border-radius:6px;background:#fbfcfe}.element-fields{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:15px}.element-fields .field{margin:0!important;font-size:11px}.element-fields input{font-size:12px;padding:6px;min-height:32px}.element-fields .wide{grid-column:1/-1}.editable-shape{cursor:move}.element-list{max-height:120px;overflow:auto;display:flex;flex-direction:column;gap:3px;margin-top:12px}.element-button{border:0;background:transparent;text-align:left;padding:5px 8px;font-size:11px;color:var(--muted);border-radius:4px}.element-button.active{color:var(--navy);background:var(--pale)}.category-row{display:flex;align-items:center;gap:10px;padding:14px 12px;border-bottom:1px solid var(--line)}.category-row>.category-main{flex:1;min-width:0}.category-main strong{display:block;font-size:13px}.category-main small{display:block}.version-row{display:flex;align-items:center;gap:13px;padding:13px 0;border-bottom:1px solid var(--line);font-size:13px}.version-row .button{margin-left:auto}.profile-menu{display:flex;flex-direction:column;gap:10px}.note-below{font-size:12px;color:var(--muted);margin-top:15px}.mobile-menu{display:none}.admin-list-title{display:block;color:var(--navy);font-weight:600}.welcome-box{max-width:720px;padding:40px;background:#fff;border:1px solid var(--line);border-radius:16px}.welcome-box h1{margin:12px 0 18px}.welcome-box p{font-size:14px;color:var(--muted)}.welcome-box .actions{margin-top:25px}.table-cell-input{padding:5px 7px;min-height:30px;border-radius:4px;width:110px;font-size:12px}.stats-summary-row{display:flex;flex-wrap:wrap;gap:20px;font-size:12px;padding:12px 0}.stats-summary-row strong{color:var(--navy)}[hidden]{display:none!important}
@media(min-width:1500px){.workspace{padding:38px 52px}.app-layout{grid-template-columns:280px 1fr}.app-header{padding:0 36px}.app-tabs{padding:0 36px}.area-tab{padding-left:30px;padding-right:30px}}
@media(max-width:1100px){.workspace{padding:26px 24px}.analysis-grid,.model-grid{grid-template-columns:1fr}.app-layout{grid-template-columns:225px minmax(0,1fr)}.area-tab{padding:17px 16px}.app-tabs{padding:0 20px}.header-right{gap:9px}.local-indicator{display:none}.graphic-editor{grid-template-columns:1fr}.auth-intro{padding:45px}.auth-intro h1{font-size:38px}.profile-button strong{max-width:130px;display:block;overflow:hidden;text-overflow:ellipsis}}
@media(max-width:760px){.app-header{height:70px;padding:0 17px;gap:12px}.brand-subtitle{display:none}.wordmark{font-size:28px}.wordmark span{font-size:15px}.header-right .profile-name{display:none}.header-right .button{padding:7px;min-height:35px}.app-tabs{padding:0 10px;gap:0;flex-wrap:wrap}.area-tab{flex:1;padding:13px 7px;font-size:12px;gap:5px;min-height:53px}.area-tab .icon{width:16px;height:16px}.tab-tools{margin:0;padding:8px 0;width:100%;justify-content:flex-end;border-top:1px solid var(--line)}.tab-tools .button{padding:7px 10px;min-height:35px;font-size:11px}.app-layout{display:block;min-height:calc(100vh - 175px)}.sidebar{display:none;border-right:0;border-bottom:1px solid var(--line)}.sidebar.open{display:flex}.mobile-menu{display:inline-flex}.workspace{padding:23px 17px 40px}.page-heading{flex-wrap:wrap;gap:12px}.page-heading .actions{margin-left:0}h1{font-size:25px}.panel{padding:18px}.two-col{grid-template-columns:1fr}.auth-page{display:block}.auth-intro{padding:26px;gap:20px}.auth-intro>div:nth-child(2){display:none}.auth-intro footer{display:none}.auth-form-side{padding:40px 24px}.auth-form{max-width:420px}.dialog-body{padding:20px}.dialog-header{padding:18px 20px}.dialog-footer{padding:16px 20px}.lesson-graphic{max-height:240px}.equation{font-size:21px}.concept-box{padding:21px 18px;gap:12px}.concept-box p{font-size:14px}.learning-step{grid-template-columns:33px 1fr;gap:12px}.step-number{width:32px;height:32px}.learning-step:before{left:15px;top:39px}.result-value{font-size:38px}.save-bar .button{font-size:12px;padding:8px}.admin-editor-header{align-items:flex-start}.category-row{flex-wrap:wrap}.category-row .actions{margin-left:auto}.table-wrap{max-height:400px}.profile-button{padding:1px}.block-toolbar .actions{gap:0}.block-toolbar .button{padding:3px 5px}.edit-tab{padding:10px;font-size:12px}.button{min-height:44px}.element-button{min-height:36px}}
@media(prefers-reduced-motion:no-preference){.button,.method-link,.area-tab{transition:background .15s,border-color .15s}.toast{animation:appear .15s ease-out}@keyframes appear{from{opacity:0;translate:0 6px}to{opacity:1;translate:0 0}}}
@media print{.app-header,.app-tabs,.sidebar,.save-bar,.toast,.button,.breadcrumbs,.analysis-settings,.skip-link{display:none!important}.app-layout,.analysis-grid,.model-grid{display:block}.workspace{padding:0;max-width:none}.panel{border:0;padding:0}.page-heading{margin:10px 0}.stat-chart{max-height:320px}.table-wrap{max-height:none;overflow:visible}body{background:#fff}th{position:static}.result-detail{display:block}}
.editable-shape{touch-action:none}

.app-brand{display:flex;align-items:center;gap:14px;min-width:0;flex-shrink:0}
.brand-logo{display:block;width:64px;height:64px;object-fit:contain;flex-shrink:0}
.brand-copy{min-width:0}.brand-name{display:block;color:var(--navy);font-size:16px;font-weight:600;line-height:1.25;max-width:230px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.app-brand .brand-subtitle{margin:5px 0 0;font-size:11px}
.auth-intro .brand-logo{width:88px;height:88px}.auth-intro .brand-name{color:#fff;font-size:20px}.auth-intro .brand-subtitle{color:#c6d4e2}
.auth-form>.app-brand{margin-bottom:22px}.initial-loading>.app-brand{justify-content:center}
@media(max-width:760px){.app-brand{gap:10px}.app-header .brand-logo{width:48px;height:48px}.app-header .brand-copy{display:none}.auth-intro .brand-logo{width:58px;height:58px}.auth-intro .brand-name{font-size:17px}.auth-intro .app-brand .brand-subtitle{display:block}}

.app-tabs{flex-wrap:wrap}.wordmark span{display:inline-block;max-width:32vw;vertical-align:baseline;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

input[type=range]{appearance:none;-webkit-appearance:none;height:25px}
input[type=range]::-webkit-slider-runnable-track{height:6px;background:#dfe6ed;border-radius:8px}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:17px;height:17px;margin-top:-5.5px;background:#8098b1;border-radius:50%;border:0}
input[type=range]::-moz-range-track{height:6px;background:#dfe6ed;border-radius:8px}
input[type=range]::-moz-range-thumb{width:17px;height:17px;background:#8098b1;border-radius:50%;border:0}

/* Semester and course management */
.course-context{display:flex;align-items:center;gap:16px;padding:12px 32px;background:#fff;border-bottom:1px solid var(--line,#dce4ec);flex-wrap:wrap}
.course-context .field{margin:0;min-width:260px;max-width:600px;flex:1}.course-context select{max-width:100%}
.course-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,360px),1fr));gap:20px}
.course-card{display:flex;flex-direction:column;gap:14px}.course-card h2,.course-card p{margin:0}.course-card>.actions:last-child{margin-top:auto;flex-wrap:wrap}
.course-filters{display:flex;align-items:center;gap:24px;flex-wrap:wrap;margin-bottom:24px}.course-filters .field{min-width:240px}
#invitation-result{overflow-wrap:anywhere}#invitation-result input{width:100%}
@media(max-width:700px){.course-context{padding:12px 16px;gap:10px}.course-context .field{min-width:180px}.course-filters{gap:12px}}

/* Fix 3: navigation and teaching editor */
.header-courses{white-space:nowrap;border-radius:10px;min-height:42px}
.profile-summary{display:flex;align-items:center;gap:14px;padding:4px 0 20px;margin-bottom:8px;border-bottom:1px solid var(--line);min-width:0}
.profile-summary>div{min-width:0}.profile-summary p{overflow-wrap:anywhere;margin:4px 0;color:var(--muted);font-size:13px}
.profile-menu>.button{justify-content:flex-start;min-height:46px;border-radius:10px}
.profile-menu>.button:last-child{margin-top:6px}
.rich-field{display:flex;flex-direction:column;gap:9px;margin-top:18px;min-width:0}
.field-label{font-size:13px;font-weight:600;color:var(--ink)}
.rich-editor-shell{border:1px solid #cbd7e3;border-radius:10px;overflow:hidden;background:white}
.rich-editor-shell[hidden],.rich-fallback[hidden],.rich-validation-error[hidden],.editor-load-error[hidden]{display:none!important}
.rich-editor-shell:focus-within{border-color:#8098b1;box-shadow:0 0 0 3px #8098b12b}
.rich-editor-shell .ql-toolbar.ql-snow{border:0;border-bottom:1px solid var(--line);padding:9px 10px;background:#f7f9fc;display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-family:inherit}
.rich-editor-shell .ql-toolbar .ql-formats{display:inline-flex;gap:2px;margin:0;padding-right:8px;border-right:1px solid var(--line)}
.rich-editor-shell .ql-toolbar .ql-formats:last-child{padding-right:0;border-right:0}
.rich-editor-shell .ql-toolbar button{width:32px;height:32px;padding:6px;border-radius:6px;color:var(--navy);font-size:21px;line-height:1}
.rich-editor-shell .ql-toolbar button:hover,.rich-editor-shell .ql-toolbar button.ql-active{background:#e3ebf4;color:var(--navy)}
.rich-editor-shell .ql-toolbar button:focus-visible{outline:2px solid var(--navy);outline-offset:1px}
.rich-editor-shell .ql-toolbar button .ql-stroke{stroke:currentColor}.rich-editor-shell .ql-toolbar button .ql-fill{fill:currentColor}
.rich-editor-shell .ql-container.ql-snow{border:0;font-family:inherit;font-size:15px;color:var(--ink)}
.rich-editor-shell .ql-editor{min-height:180px;max-height:520px;overflow-y:auto;padding:20px 22px;line-height:1.75;tab-size:4}
.rich-editor-shell .ql-editor.ql-blank::before{left:22px;right:22px;color:var(--muted);font-style:normal}
.rich-editor-shell .ql-editor h2,.rich-content h2{font-size:21px;font-weight:650;line-height:1.4;margin:20px 0 10px;color:var(--navy)}
.rich-editor-shell .ql-editor h3,.rich-content h3{font-size:17px;font-weight:650;line-height:1.5;margin:16px 0 8px;color:var(--navy)}
.rich-editor-shell .ql-editor p,.rich-content p{margin:0 0 10px}
.rich-editor-shell .ql-editor blockquote,.rich-content blockquote{margin:14px 0;padding:10px 16px;border-left:3px solid #8098b1;background:#f4f7fa;color:#465e76}
.rich-field>small{font-size:11px;line-height:1.5;color:var(--muted)}
.rich-fallback textarea{width:100%;min-height:180px}
.rich-validation-error{font-size:13px;color:#9c3541}
.rich-content{font-size:15px;line-height:1.75;overflow-wrap:anywhere;white-space:pre-wrap}
.rich-content ul,.rich-content ol{padding-left:1.7em;margin:10px 0 16px;white-space:normal}
.rich-content li{padding-left:3px;margin:5px 0;white-space:pre-wrap}
.rich-content>:first-child{margin-top:0}.rich-content>:last-child{margin-bottom:0}
.learning-step>div,.concept-box>div{min-width:0}
@media(max-width:760px){.header-right .header-courses{padding:8px 10px;font-size:12px;gap:7px}.rich-editor-shell .ql-editor{padding:16px;min-height:160px}.rich-editor-shell .ql-toolbar.ql-snow{gap:6px;padding:7px}.rich-editor-shell .ql-toolbar .ql-formats{padding-right:5px}.rich-editor-shell .ql-toolbar button{width:30px;height:32px}}

/* Fix 4: course participants, access periods and resource selection */
.management-tabs{display:flex;gap:4px;padding:5px;background:#e9eef5;border-radius:12px;width:fit-content;margin:0 0 28px;max-width:100%}
.management-tabs .button{background:transparent;border-color:transparent;box-shadow:none;font-size:13px;padding:10px 16px;border-radius:9px}
.management-tabs .button.active{background:white;color:var(--navy);box-shadow:0 2px 8px #17355112}
.management-summary{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:0 0 24px}
.management-summary>div{background:white;border:1px solid var(--line);border-radius:12px;padding:20px 22px;display:flex;flex-direction:column;gap:4px}
.management-summary strong{font-size:28px;font-weight:650;line-height:1.2;letter-spacing:-.6px;color:var(--navy)}
.management-summary span{font-size:12px;color:var(--muted)}
.participant-tools{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:24px}
.participant-tools>.field{min-width:220px}.participant-tools .actions{padding-bottom:2px}
.participant-table th{white-space:nowrap}.participant-table td{vertical-align:middle}.participant-table td small{display:block;margin-top:4px}
.participant-table td:nth-child(2){min-width:190px}.participant-table .last-login{min-width:140px;font-size:12px;color:var(--muted)}
.participant-table input[type=checkbox],.resource-row input[type=checkbox]{width:17px;height:17px;min-height:0;accent-color:var(--navy);flex-shrink:0}
.participant-table input:disabled{opacity:.35;cursor:default}
.access-chip{display:inline-block;padding:5px 9px;border-radius:7px;font-size:11px;font-weight:600;white-space:nowrap}
.access-chip.active{background:#e7f3ef;color:#23624d}.access-chip.scheduled{background:#fff2d8;color:#795921}.access-chip.expired{background:#f9e9eb;color:#8a3a48}.access-chip.inactive{background:#edf0f4;color:#637185}
.management-details{margin-top:24px}.management-details summary{font-weight:600;color:var(--navy);cursor:pointer;list-style-position:inside}
.management-details[open]>summary{margin-bottom:24px}.management-details h3{margin-bottom:14px}.management-details small{display:block}
.invite-list{margin-top:22px}.management-details .stack{gap:14px}
.resource-columns{align-items:start}.resource-list{margin-top:18px}
.resource-row{display:flex;align-items:flex-start;gap:14px;padding:18px 0;border-bottom:1px solid var(--line);cursor:pointer;font-weight:400}
.resource-row:last-child{border-bottom:0}.resource-row>input{margin:4px 0 0}
.resource-copy{display:flex;flex-direction:column;gap:5px;min-width:0;flex:1}.resource-copy strong{font-size:14px;color:var(--navy)}
.resource-copy>span{font-size:12px;line-height:1.6;color:var(--muted);overflow-wrap:anywhere}.resource-copy>small{font-size:11px}
.resource-row .label-chip{font-size:10px;white-space:nowrap;margin-top:1px;padding:4px 7px}
.enrol-preview{max-height:48vh;overflow:auto}.enrol-preview th{white-space:nowrap}.enrol-preview small{display:block;margin-top:3px}
.import-guide{display:flex;flex-direction:column;align-items:flex-start;gap:9px;padding:18px;background:var(--pale);border-radius:10px}
.import-guide p{font-size:13px;color:var(--muted)}.import-guide>strong:last-child{margin-top:12px}
#enrol-progress:not(:empty){padding:14px 0;color:var(--navy);font-size:13px;font-weight:600}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:1100px){.management-summary{grid-template-columns:repeat(2,minmax(0,1fr))}.resource-columns{grid-template-columns:1fr}}
@media(max-width:760px){.management-tabs{width:100%;margin-bottom:22px}.management-tabs .button{flex:1;padding:10px 8px;gap:6px;font-size:12px}.management-summary{gap:10px}.management-summary>div{padding:15px}.management-summary strong{font-size:25px}.participant-tools{gap:14px}.participant-tools>.field{width:100%}.participant-tools .actions{width:100%;justify-content:space-between}.resource-row{flex-wrap:wrap;gap:10px}.resource-row .label-chip{margin-left:27px}.resource-copy{flex-basis:calc(100% - 30px)}}
/* Visual mathematical editor */
.math-editor{margin-top:18px;color:var(--navy)}.math-editor-heading{display:flex;flex-wrap:wrap;align-items:baseline;gap:10px;margin:20px 0 9px}.math-editor-heading small,.math-caption{color:var(--muted);font-size:12px}.math-workspace,.math-legend-editor{border:1px solid var(--line);border-radius:10px;background:#f9fbfd;padding:16px;overflow-x:auto}.math-sequence{display:inline-flex;align-items:center;gap:5px;min-height:40px;vertical-align:middle}.math-node{display:inline-flex;align-items:flex-start;position:relative;gap:2px}.math-node>.math-remove{opacity:.52}.math-node:hover>.math-remove,.math-remove:focus{opacity:1}.math-input{width:8ch;min-width:5ch;max-width:320px;min-height:36px!important;padding:5px!important;font-family:Georgia,serif;font-size:17px!important}.math-remove,.math-add button{border:1px solid var(--line);background:#fff;color:var(--navy);border-radius:5px;min-width:26px;height:29px;padding:0 5px}.math-add{display:inline-flex;align-items:center;gap:3px}.math-add select{width:100px;min-height:29px;padding:3px;font-size:11px;color:var(--muted)}.math-frac{display:inline-flex;flex-direction:column;align-items:stretch;text-align:center}.math-frac>span:first-child{border-bottom:2px solid var(--navy)}.math-root,.math-script,.math-sum,.math-brackets{display:inline-flex;align-items:center}.math-root>span:first-child{font-size:35px}.math-root>span:nth-child(2){border-top:2px solid var(--navy)}.math-script .math-sup{align-self:flex-start;transform:translateY(-8px)}.math-script .math-sub{align-self:flex-end;transform:translateY(8px)}.math-sum>span:first-child{display:flex;flex-direction:column;align-items:center}.math-sum b{font:34px Georgia,serif}.math-brackets{font:32px Georgia,serif}.math-legend-editor{display:grid;grid-template-columns:minmax(180px,1fr) minmax(180px,1fr) auto;align-items:end;gap:12px;margin-bottom:10px}.math-legend-editor>div{min-width:0;overflow-x:auto}.math-caption{display:block;margin-bottom:5px}.math-preview{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}.math-preview .equation{margin:5px 0;font-size:23px}.structured-equation{overflow-x:auto}.structured-equation math,.formula-legend math{font-family:Cambria Math,STIX Two Math,serif}.formula-legend{border-top:1px solid var(--line);margin-top:15px;padding-top:12px;font-size:14px}.formula-legend>strong{display:block;font-size:12px;color:var(--muted);margin-bottom:8px}.formula-legend-row{display:grid;grid-template-columns:minmax(50px,auto) 1fr;gap:16px;align-items:baseline;margin:5px 0}.formula-legend-row math{font-size:1.15em}.math-preview .formula-legend{background:transparent}@media(max-width:760px){.math-legend-editor{grid-template-columns:1fr}.math-legend-editor .button{justify-self:start}}
.math-sequence{flex-wrap:wrap}.math-break-node{flex-basis:100%;font-size:11px;color:var(--muted)}.math-linebreak{padding:4px 6px;background:#e8eef5;border-radius:4px}
.math-toolbar{display:flex;flex-wrap:wrap;gap:5px;padding:8px;background:#f2f6fa;border:1px solid var(--line);border-radius:9px 9px 0 0}.math-toolbar button{display:inline-flex;align-items:center;gap:5px;min-height:36px;padding:4px 8px;border:1px solid transparent;border-radius:6px;background:white;color:var(--navy);font-family:inherit}.math-toolbar button:hover,.math-toolbar button:focus-visible{border-color:var(--blue);background:#e7eff7}.math-toolbar button>span{font:20px Georgia,serif}.math-toolbar button small{font-size:11px}.math-toolbar+.math-workspace{border-radius:0 0 10px 10px}.math-legend-editor .math-toolbar{border-radius:7px;margin:6px 0}.math-legend-editor .math-toolbar button small{display:none}
.fx-editor{margin-top:16px}.fx-editor h3{margin:20px 0 10px}.fx-toolbar{overflow-x:auto;background:#f3f6fa;border:1px solid var(--line);border-radius:8px;padding:8px}.fx-field{min-width:0;margin-top:12px}.fx-field>strong{display:block;font-size:13px;color:var(--navy);margin-bottom:7px}.fx-math-view,.fx-latex-view{min-height:48px;padding:12px;border:1px solid var(--line);border-radius:8px;background:#fff;overflow-x:auto}.fx-latex-view{font:14px monospace}.fx-field details{margin:8px 0;color:var(--muted);font-size:12px}.fx-field summary{cursor:pointer}.fx-field textarea{width:100%}.fx-legend-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) auto;gap:12px;align-items:end;margin-bottom:12px}.fx-legend-row .fx-field{overflow-x:auto}.formula-render-error{font:14px monospace;white-space:pre-wrap;overflow-wrap:anywhere}.katex-display{overflow-x:auto;overflow-y:hidden}@media(max-width:760px){.fx-legend-row{grid-template-columns:1fr}}

/* Vier ruhige Lernwelten: helle Flächen und gut lesbare Akzente. */
.area-tab[data-area="explain"]{--tab-background:#e1eef8;--tab-accent:#226596}
.area-tab[data-area="math"]{--tab-background:#e8e9f5;--tab-accent:#565693}
.area-tab[data-area="model"]{--tab-background:#dcefe9;--tab-accent:#216b60}
.area-tab[data-area="analyze"]{--tab-background:#f8edcf;--tab-accent:#856015}
.area-tab[data-area]{background:var(--tab-background);color:#173551;border-bottom-color:transparent}
.area-tab[data-area] .icon{color:var(--tab-accent)}
.area-tab[data-area]:hover{filter:brightness(.97)}
.area-tab[data-area].active{border-bottom-color:var(--tab-accent);box-shadow:inset 0 -2px var(--tab-accent);font-weight:700}
.area-tab:focus-visible{outline-color:#012e5d;outline-offset:-4px}
.app-layout[data-learning-area="explain"]{background:#f2f8fd;--area-sidebar:#e1eef8;--area-accent:#226596;--muted:#465d73--area-soft:#eaf3fa;--area-surface:#fcfeff;--area-border:#cbdfea;--area-accent-hover:#174d75;}
.app-layout[data-learning-area="math"]{background:#f4f4fb;--area-sidebar:#e8e9f5;--area-accent:#565693;--muted:#465d73--area-soft:#efeff8;--area-surface:#fdfdff;--area-border:#d9d9ec;--area-accent-hover:#414172;}
.app-layout[data-learning-area="model"]{background:#f0f8f6;--area-sidebar:#dcefe9;--area-accent:#216b60;--muted:#465d73--area-soft:#e7f3ef;--area-surface:#fcfffe;--area-border:#c8e3da;--area-accent-hover:#185249;}
.app-layout[data-learning-area="analyze"]{background:#fffaef;--area-sidebar:#f8edcf;--area-accent:#856015;--muted:#465d73--area-soft:#faf1dc;--area-surface:#fffdf8;--area-border:#e9d9b4;--area-accent-hover:#67480c;}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .sidebar{background:var(--area-sidebar,#fbfcfe)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .sidebar-footer{color:var(--muted)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .method-link:hover{background:rgba(255,255,255,.55)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .method-link.active{background:#fff;color:#012e5d;box-shadow:inset 3px 0 var(--area-accent,#012e5d)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .method-dot{background:var(--area-accent,#8098b1)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .sidebar-title .icon{color:var(--area-accent,#012e5d)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .sidebar-bottom{border-top-color:rgba(1,46,93,.18)}
/* Innenflächen und Bedienelemente folgen der Farbe des Lernbereichs. */
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace{
  --pale:var(--area-soft);--blue:var(--area-accent);--line:var(--area-border);
}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace :is(.panel,.formula-box,.graphic-box,.welcome-box){background:var(--area-surface)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace :is(.concept-box,.rich-content blockquote){background:var(--area-soft)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace :is(.concept-box>.icon,.dataset-banner .icon,.panel-header .icon,.empty-state .icon){color:var(--area-accent)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace :is(.step-number,.button.primary){background:var(--area-accent);border-color:var(--area-accent);color:#fff}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace .button.primary:not(:disabled):hover{background:var(--area-accent-hover);border-color:var(--area-accent-hover)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace .button.primary:disabled{background:var(--area-soft);border-color:var(--area-border);color:var(--area-accent);opacity:1}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace :is(input,select,textarea){border-color:var(--area-border)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace :is(button,input,select,textarea,a):focus-visible{outline-color:var(--area-accent)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace .rich-content blockquote{border-left-color:var(--area-accent)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace .learning-step:before{border-left-color:var(--area-border)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace input[type=range]::-webkit-slider-thumb{background:var(--area-accent)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace input[type=range]::-moz-range-thumb{background:var(--area-accent)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace .stat-chart [fill="#8098b1"]{fill:var(--area-accent)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace .stat-chart [stroke="#8098b1"]{stroke:var(--area-accent)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace .stat-chart [fill="#e4ebf2"]{fill:var(--area-soft)}

.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace .button:not(.primary):hover{border-color:var(--area-accent)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace th{background:var(--area-soft);border-bottom-color:var(--area-border)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace input[type=range]::-webkit-slider-runnable-track{background:var(--area-border)}
.app-layout:is([data-learning-area="explain"],[data-learning-area="math"],[data-learning-area="model"],[data-learning-area="analyze"]) .workspace input[type=range]::-moz-range-track{background:var(--area-border)}
.app-header .course-context{padding:0;border:0;background:transparent;min-width:0;flex-wrap:nowrap}
.app-header .course-context .field{min-width:0;width:clamp(180px,24vw,350px);gap:3px;font-size:11px}
.app-header .course-context select{width:100%;min-height:36px;padding:6px 10px;font-size:12px}
@media(max-width:760px){
  .app-header{gap:8px}
  .header-right{min-width:0;gap:6px;flex:1;justify-content:flex-end}
  .app-header .course-context{flex:1;justify-content:flex-end}
  .app-header .course-context .field{width:100%;max-width:240px}
  .app-header .course-context select{min-width:0;padding:6px;font-size:11px}
  .header-right .header-courses{white-space:nowrap}
}
@media(max-width:390px){
  .app-header{padding:0 8px}
  .app-header .brand-logo{width:38px;height:38px}
  .header-right .header-courses{font-size:11px;padding:6px}
  .header-right .header-courses .icon{display:none}
}