/* Martynov-Class UI extension — MDS 1.5.0 */
:root {
  --mds-mc-canvas:#FAFCFF; --mds-mc-surface:#FFF; --mds-mc-surface-subtle:#F7FAFD;
  --mds-mc-border:#E3EAF2; --mds-mc-text:#0F1F3D; --mds-mc-text-2:#66758F;
  --mds-mc-active-bg:#EAF4FF; --mds-mc-active:#007FE8;
  --mds-mc-sidebar-w:256px; --mds-mc-topbar-h:80px; --mds-mc-rail-w:280px;
  --mds-mc-card-r:14px; --mds-mc-control-r:10px; --mds-mc-modal-r:20px;
  --mds-mc-panel-shadow:0 1px 3px rgba(15,31,61,.05),0 8px 24px rgba(15,31,61,.03);
}
.mds-mc-shell{min-height:100vh;background:var(--mds-mc-canvas);color:var(--mds-mc-text);font-family:var(--mds-font-sans,Inter,"Segoe UI",Arial,sans-serif);display:grid;grid-template-columns:var(--mds-mc-sidebar-w) minmax(0,1fr)}
.mds-mc-sidebar{position:sticky;top:0;height:100vh;background:#fff;border-right:1px solid var(--mds-mc-border);padding:18px 12px;display:flex;flex-direction:column;gap:8px}
.mds-mc-nav-item{height:48px;border-radius:10px;padding:0 14px;display:flex;align-items:center;gap:12px;color:#385070;text-decoration:none;font-weight:500;transition:background .16s ease,color .16s ease}
.mds-mc-nav-item:hover{background:#F4F8FC}.mds-mc-nav-item[aria-current="page"],.mds-mc-nav-item.is-active{background:var(--mds-mc-active-bg);color:var(--mds-mc-active)}
.mds-mc-main{min-width:0}.mds-mc-topbar{height:var(--mds-mc-topbar-h);background:#fff;border-bottom:1px solid var(--mds-mc-border);display:flex;align-items:center;justify-content:space-between;padding:0 24px;position:sticky;top:0;z-index:20}
.mds-mc-page{padding:20px 24px 32px}.mds-mc-page-header{min-height:84px;display:flex;align-items:flex-start;justify-content:space-between;gap:24px;padding:4px 0 20px}.mds-mc-page-title{font-size:28px;line-height:1.2;font-weight:700;margin:0;color:var(--mds-mc-text)}.mds-mc-page-subtitle{margin:8px 0 0;color:var(--mds-mc-text-2);font-size:14px}
.mds-mc-panel,.mds-mc-card{background:var(--mds-mc-surface);border:1px solid var(--mds-mc-border);border-radius:var(--mds-mc-card-r);box-shadow:var(--mds-mc-panel-shadow)}.mds-mc-card{padding:20px}.mds-mc-panel{overflow:hidden}
.mds-mc-stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.mds-mc-stat{min-height:104px;padding:18px;border:1px solid var(--mds-mc-border);border-radius:14px;background:#fff}.mds-mc-stat-label{font-size:13px;color:var(--mds-mc-text-2)}.mds-mc-stat-value{font-size:28px;font-weight:700;margin-top:6px}
.mds-mc-toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:16px;border-bottom:1px solid var(--mds-mc-border)}.mds-mc-input,.mds-mc-select{height:42px;border:1px solid var(--mds-mc-border);border-radius:10px;background:#fff;padding:0 13px;color:var(--mds-mc-text);outline:none}.mds-mc-input:focus,.mds-mc-select:focus{border-color:#0099FF;box-shadow:0 0 0 3px rgba(0,153,255,.16)}
.mds-mc-btn{height:42px;border-radius:10px;border:1px solid var(--mds-mc-border);background:#fff;padding:0 16px;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;color:#19345A;cursor:pointer}.mds-mc-btn:hover{background:#F7FAFD}.mds-mc-btn--primary{background:#0099FF;border-color:#0099FF;color:#fff}.mds-mc-btn--primary:hover{background:#008BE8}.mds-mc-btn--danger{color:#D92D20;border-color:#FFD2CF;background:#FFF7F6}.mds-mc-btn--ghost{border-color:transparent;background:transparent}
.mds-mc-tabs{height:48px;border-bottom:1px solid var(--mds-mc-border);display:flex;gap:28px;align-items:flex-end}.mds-mc-tab{height:48px;display:flex;align-items:center;color:#5D6C84;position:relative}.mds-mc-tab.is-active{color:#007FE8;font-weight:600}.mds-mc-tab.is-active:after{content:"";height:2px;position:absolute;left:0;right:0;bottom:-1px;background:#0099FF;border-radius:2px}
.mds-mc-table{width:100%;border-collapse:collapse;font-size:13px}.mds-mc-table th{height:46px;text-align:left;font-weight:500;color:#708099;border-bottom:1px solid var(--mds-mc-border);padding:0 14px}.mds-mc-table td{height:58px;border-bottom:1px solid #EDF2F7;padding:0 14px}.mds-mc-table tr:hover td{background:#FBFDFF}
.mds-mc-status{display:inline-flex;align-items:center;height:28px;border-radius:999px;padding:0 10px;font-size:12px;font-weight:600}.mds-mc-status--success{color:#139A4A;background:#E7F8ED}.mds-mc-status--warning{color:#D97706;background:#FFF4DE}.mds-mc-status--danger{color:#E5484D;background:#FFE8E8}.mds-mc-status--info{color:#1677FF;background:#EAF4FF}.mds-mc-status--neutral{color:#65758B;background:#F0F3F7}
.mds-mc-progress{height:6px;background:#EAF0F6;border-radius:999px;overflow:hidden}.mds-mc-progress>span{display:block;height:100%;border-radius:inherit;background:#0099FF}.mds-mc-chip{height:28px;border-radius:8px;background:#F2F6FA;padding:0 10px;display:inline-flex;align-items:center;color:#314766;font-size:12px}
.mds-mc-split{display:grid;grid-template-columns:minmax(0,1fr) var(--mds-mc-rail-w);gap:16px}.mds-mc-editor{display:grid;grid-template-columns:220px minmax(0,1fr) 300px;gap:16px}.mds-mc-editor-rail,.mds-mc-right-rail{background:#fff;border:1px solid var(--mds-mc-border);border-radius:14px;min-width:0}.mds-mc-editor-main{min-width:0;background:#fff;border:1px solid var(--mds-mc-border);border-radius:14px}
.mds-mc-modal-backdrop{position:fixed;inset:0;background:rgba(15,31,61,.48);display:grid;place-items:center;padding:24px;z-index:100}.mds-mc-modal{width:min(720px,calc(100vw - 48px));max-height:calc(100vh - 48px);overflow:auto;background:#fff;border:1px solid var(--mds-mc-border);border-radius:20px;box-shadow:0 24px 64px rgba(15,31,61,.18);padding:24px}.mds-mc-drawer{position:fixed;right:0;top:0;height:100vh;width:min(460px,100vw);background:#fff;border-left:1px solid var(--mds-mc-border);box-shadow:-12px 0 36px rgba(15,31,61,.12);z-index:100}
.mds-mc-calendar-card{border:1px solid var(--mds-mc-border);border-radius:10px;padding:12px;background:#F7FBFF}.mds-mc-subject-blue{--mds-mc-subject:#1677FF}.mds-mc-subject-violet{--mds-mc-subject:#7C3AED}.mds-mc-subject-orange{--mds-mc-subject:#FF8A00}.mds-mc-subject-green{--mds-mc-subject:#20B966}.mds-mc-calendar-card{border-left:3px solid var(--mds-mc-subject,#1677FF)}
@media(max-width:1180px){.mds-mc-shell{grid-template-columns:72px minmax(0,1fr)}.mds-mc-sidebar{padding-inline:8px}.mds-mc-sidebar .mds-mc-nav-label{display:none}.mds-mc-split{grid-template-columns:1fr}.mds-mc-right-rail{display:none}.mds-mc-editor{grid-template-columns:180px minmax(0,1fr)}.mds-mc-editor>.mds-mc-right-rail{display:none}.mds-mc-stats{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){.mds-mc-shell{display:block}.mds-mc-sidebar{display:none}.mds-mc-page{padding:16px}.mds-mc-topbar{height:64px;padding:0 16px}.mds-mc-stats{grid-template-columns:1fr}.mds-mc-editor{grid-template-columns:1fr}.mds-mc-editor-rail{display:none}.mds-mc-page-header{flex-direction:column}}
@media(prefers-reduced-motion:reduce){.mds-mc-nav-item{transition:none}}

/* Course patterns — canonical in MDS 1.5.0 */
.mds-mc-course-card{min-height:136px;display:grid;grid-template-columns:104px minmax(0,1fr) auto;gap:18px;align-items:center;padding:18px;background:#fff;border:1px solid var(--mds-mc-border);border-radius:14px;box-shadow:var(--mds-mc-panel-shadow)}
.mds-mc-course-cover{width:104px;height:104px;border-radius:14px;background:linear-gradient(145deg,#EEF7FF,#F8FBFF);display:grid;place-items:center;font-size:38px;font-weight:700;color:#1677FF;overflow:hidden}
.mds-mc-course-meta{display:flex;align-items:center;gap:16px;flex-wrap:wrap;color:var(--mds-mc-text-2);font-size:13px}.mds-mc-course-title{margin:0 0 8px;font-size:18px;line-height:1.25;font-weight:700;color:var(--mds-mc-text)}
.mds-mc-course-entity-header{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:104px;padding:16px 0}.mds-mc-course-entity-main{display:flex;align-items:center;gap:16px;min-width:0}.mds-mc-course-entity-cover{width:72px;height:72px;border-radius:14px;background:#EAF4FF;color:#1677FF;display:grid;place-items:center;font-size:28px;font-weight:700;flex:0 0 auto}
.mds-mc-course-program{display:flex;flex-direction:column;gap:12px}.mds-mc-course-module{background:#fff;border:1px solid var(--mds-mc-border);border-radius:14px;overflow:hidden}.mds-mc-course-module-header{min-height:58px;display:grid;grid-template-columns:32px 42px minmax(0,1fr) auto;align-items:center;gap:10px;padding:0 14px;border-bottom:1px solid #EDF2F7}.mds-mc-course-module-index{width:36px;height:36px;border-radius:10px;background:#F0F6FF;color:#1677FF;display:grid;place-items:center;font-weight:700}.mds-mc-course-item{min-height:54px;display:grid;grid-template-columns:24px 32px minmax(0,1fr) auto auto;gap:12px;align-items:center;padding:0 14px 0 48px;border-bottom:1px solid #EDF2F7}.mds-mc-course-item:last-child{border-bottom:0}.mds-mc-course-item:hover{background:#FBFDFF}
.mds-mc-course-type{width:32px;height:32px;border-radius:9px;display:grid;place-items:center;background:#EAF4FF;color:#1677FF}.mds-mc-course-type--homework{background:#E7F8ED;color:#139A4A}.mds-mc-course-type--class{background:#FFF4DE;color:#D97706}.mds-mc-course-type--test{background:#F1EBFF;color:#7C3AED}.mds-mc-course-type--material{background:#EEF5FF;color:#356FE5}
.mds-mc-course-editor{display:grid;grid-template-columns:280px minmax(0,1fr) 320px;gap:16px}.mds-mc-course-editor>section,.mds-mc-course-editor>aside{min-width:0;background:#fff;border:1px solid var(--mds-mc-border);border-radius:14px}
.mds-mc-course-hero{min-height:180px;display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:24px;align-items:center;padding:24px;background:#fff;border:1px solid var(--mds-mc-border);border-radius:14px}.mds-mc-course-hero-main{display:flex;align-items:flex-start;gap:20px}.mds-mc-course-hero-cover{width:112px;height:112px;border-radius:16px;background:#EEF7FF;color:#1677FF;display:grid;place-items:center;font-size:42px;font-weight:700;flex:0 0 auto}
.mds-mc-file-dropzone{min-height:76px;border:1px dashed #C8D7E8;border-radius:12px;background:#FBFDFF;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 20px}.mds-mc-course-rail{display:flex;flex-direction:column;gap:14px}.mds-mc-course-rail>.mds-mc-card{padding:18px}
.mds-mc-progress-ring{--value:58;width:112px;aspect-ratio:1;border-radius:50%;background:conic-gradient(#0099FF calc(var(--value)*1%),#E8EEF5 0);display:grid;place-items:center;position:relative}.mds-mc-progress-ring:before{content:"";position:absolute;inset:10px;border-radius:50%;background:#fff}.mds-mc-progress-ring>span{position:relative;z-index:1;font-size:24px;font-weight:700;color:var(--mds-mc-text)}
@media(max-width:1180px){.mds-mc-course-card{grid-template-columns:80px minmax(0,1fr) auto}.mds-mc-course-cover{width:80px;height:80px}.mds-mc-course-editor{grid-template-columns:220px minmax(0,1fr)}.mds-mc-course-editor>aside:last-child{display:none}.mds-mc-course-hero{grid-template-columns:1fr}.mds-mc-course-item{padding-left:24px}}
@media(max-width:760px){.mds-mc-course-card{grid-template-columns:64px minmax(0,1fr)}.mds-mc-course-cover{width:64px;height:64px;font-size:26px}.mds-mc-course-card> :last-child{grid-column:1/-1}.mds-mc-course-editor{grid-template-columns:1fr}.mds-mc-course-editor>aside{display:none}.mds-mc-course-entity-header{align-items:flex-start;flex-direction:column}.mds-mc-course-hero-main{flex-direction:column}.mds-mc-course-item{grid-template-columns:28px minmax(0,1fr) auto;padding:10px 12px}.mds-mc-course-item>:first-child{display:none}}