:root{--orange:#fe5c00;--orange-dark:#d54e00;--orange-soft:#fff1e9;--ink:#181b20;--muted:#6a7180;--line:#e5e8ed;--background:#f6f7fa;--white:#fff;--green:#16804a;--green-bg:#e6f6ec;--yellow:#a96808;--yellow-bg:#fff5db;--red:#b93434;--red-bg:#fbeaea;--radius:14px;--shadow:0 4px 20px rgba(19,25,33,.045);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:var(--ink)}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--background)}button,input,select,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.6}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #ff9c67;outline-offset:2px}a{color:var(--orange-dark)}.app-layout{display:grid;grid-template-columns:240px minmax(0,1fr);min-height:100vh}.sidebar{background:#1b1c20;color:#f6f7f8;padding:22px 14px;display:flex;flex-direction:column;gap:28px;min-height:100vh}.brand{display:flex;gap:11px;align-items:center;padding:6px 10px}.brand-mark{background:var(--orange);width:43px;height:43px;border-radius:12px;display:flex;align-items:center;justify-content:center;color:white}.brand-name{font-size:20px;font-weight:850;letter-spacing:.4px}.brand-caption{font-size:11px;color:#aeb4bf;margin-top:1px}.side-label{font-size:10px;letter-spacing:1.3px;color:#8c919b;font-weight:750;text-transform:uppercase;padding:0 14px;margin-bottom:10px}.nav-list{display:grid;gap:5px}.nav-btn{width:100%;display:flex;align-items:center;gap:12px;background:transparent;border:0;color:#b7bac3;font-size:14px;font-weight:600;border-radius:9px;padding:13px 14px;text-align:left}.nav-btn:hover{background:#282b30;color:white}.nav-btn.active{background:#34302d;color:white;box-shadow:inset 3px 0 var(--orange)}.nav-btn .i{color:#aeb4c0}.nav-btn.active .i{color:var(--orange)}.sidebar-bottom{margin-top:auto;padding:13px 12px;background:#292b30;border:1px solid #414249;border-radius:12px}.sidebar-bottom .eyebrow{color:#aeb4bf}.sidebar-bottom strong{font-size:12px;line-height:1.4;display:block;margin-top:5px}.sidebar-bottom p{margin:7px 0 0;color:#acb0bd;font-size:11px;line-height:1.5}.main-area{min-width:0;display:flex;flex-direction:column}.topbar{height:76px;display:flex;justify-content:space-between;align-items:center;padding:0 35px;background:#fff;border-bottom:1px solid var(--line);gap:18px}.topbar-left{min-width:0}.breadcrumb{font-size:12px;color:var(--muted);font-weight:550}.page-name{font-size:19px;font-weight:760;margin-top:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topbar-controls{display:flex;align-items:center;gap:13px}.avatar{display:inline-flex;width:35px;height:35px;border-radius:50%;align-items:center;justify-content:center;font-size:13px;font-weight:800;background:var(--orange-soft);color:var(--orange-dark)}.instructor-select{border:0;background:transparent;max-width:158px;color:var(--ink);font-weight:650;font-size:13px}.sync-chip{border:1px solid #edd3bd;background:#fff9f4;color:#9c500d;padding:8px 11px;border-radius:30px;display:flex;gap:7px;align-items:center;font-size:12px;font-weight:700;white-space:nowrap}.workspace{padding:30px 36px 60px;max-width:1660px;width:100%;margin:0 auto}.hero{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:24px}.hero .eyebrow{color:var(--orange-dark)}.eyebrow{font-size:11px;letter-spacing:1.3px;text-transform:uppercase;font-weight:800}.hero h1{font-size:27px;letter-spacing:-.75px;margin:7px 0 7px;line-height:1.15}.hero p{margin:0;color:var(--muted);font-size:13px}.hero-actions{display:flex;flex-wrap:wrap;gap:9px}.btn{min-height:39px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:9px;border:1px solid var(--line);background:white;padding:9px 13px;color:var(--ink);font-weight:700;font-size:12px;white-space:nowrap}.btn:hover{border-color:#c9cdd4;background:#fbfbfb}.btn-primary{background:var(--orange);border-color:var(--orange);color:white}.btn-primary:hover{background:var(--orange-dark);border-color:var(--orange-dark)}.btn-dark{background:#202329;color:white;border-color:#202329}.btn-danger{color:var(--red)}.btn-ghost{background:transparent;border-color:transparent}.btn:has(.i){line-height:1}.i{display:inline-flex;align-items:center;justify-content:center;vertical-align:middle;flex:0 0 auto}.i svg{width:18px;height:18px;stroke:currentColor}.i.sm svg{width:15px;height:15px}.i.lg svg{width:22px;height:22px}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-bottom:23px}.stat-card{background:white;border-radius:13px;border:1px solid var(--line);box-shadow:var(--shadow);padding:16px 19px;min-height:115px}.stat-top{display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:11px;font-weight:750}.stat-icon{width:29px;height:29px;border-radius:8px;background:#f3f4f6;display:flex;align-items:center;justify-content:center;color:#737984}.stat-icon.orange{background:var(--orange-soft);color:var(--orange)}.stat-icon.green{background:var(--green-bg);color:var(--green)}.stat-card .number{margin:11px 0 1px;font-size:27px;font-weight:830;letter-spacing:-.8px}.stat-bottom{font-size:11px;color:var(--muted)}.panel{background:white;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}.panel-header{display:flex;align-items:center;justify-content:space-between;padding:20px 22px;gap:15px;flex-wrap:wrap}.panel-title{font-size:16px;font-weight:780}.panel-subtitle{font-size:12px;color:var(--muted);margin-top:5px}.toolbar{display:flex;gap:9px;flex-wrap:wrap;align-items:center}.field,.search-field{border:1px solid var(--line);border-radius:9px;height:40px;background:white;padding:0 12px;font-size:12px;color:var(--ink);min-width:110px}.field:focus,.search-field:focus{border-color:var(--orange)}.search-wrap{position:relative;min-width:220px}.search-wrap .i{position:absolute;left:12px;top:11px;color:#9299a3}.search-field{padding-left:35px;width:100%}.table-scroller{overflow:auto;border-top:1px solid var(--line)}.matrix{border-collapse:collapse;width:100%;min-width:670px;font-size:13px}.matrix th{background:#fafbfc;color:#707988;text-transform:uppercase;letter-spacing:.85px;font-size:10px;font-weight:850;padding:12px 14px;text-align:center;border-bottom:1px solid var(--line)}.matrix th:first-child{text-align:left;padding-left:25px;min-width:230px}.matrix td{border-bottom:1px solid #eff0f3;padding:13px 12px;text-align:center;vertical-align:middle;height:67px}.matrix tbody tr:last-child td{border-bottom:0}.matrix tbody tr:hover{background:#fffaf6}.matrix td:first-child{text-align:left;padding-left:23px}.student-info{display:flex;align-items:center;gap:11px;cursor:pointer}.student-avatar{width:35px;height:35px;display:inline-flex;justify-content:center;align-items:center;flex:0 0 auto;border-radius:10px;background:#f0f1f4;color:#4f5660;font-size:11px;font-weight:850}.student-name{font-size:12px;font-weight:750}.student-sub{font-size:11px;color:#9298a3;margin-top:3px}.icon-note{display:inline-flex;color:var(--orange);margin-left:4px;vertical-align:middle}.cell-btn{border:1px solid transparent;border-radius:8px;background:transparent;min-width:55px;min-height:36px;padding:5px 9px;display:inline-flex;justify-content:center;align-items:center;gap:6px;color:#666e7b;font-size:12px;font-weight:750}.cell-btn:hover{border-color:#f4d0b7;background:var(--orange-soft)}.pill{display:inline-flex;gap:6px;align-items:center;justify-content:center;padding:6px 10px;border-radius:7px;font-size:11px;font-weight:780;background:#f1f2f5;color:#68707d;white-space:nowrap}.pill.green{background:var(--green-bg);color:var(--green)}.pill.orange{background:var(--orange-soft);color:var(--orange-dark)}.pill.yellow{background:var(--yellow-bg);color:var(--yellow)}.pill.red{background:var(--red-bg);color:var(--red)}.pill.gray{background:#f0f1f4;color:#6d7480}.small-help{padding:13px 22px;border-top:1px solid var(--line);color:#858c99;font-size:11px;display:flex;gap:15px;justify-content:space-between;align-items:center;flex-wrap:wrap}.small-help strong{color:var(--ink)}.empty-state{text-align:center;padding:65px 22px;color:var(--muted)}.empty-state h3{color:var(--ink);font-size:16px}.section-title{font-weight:770;font-size:14px}.section-desc{font-size:12px;color:var(--muted);line-height:1.6}.backdrop{position:fixed;inset:0;background:rgba(17,21,29,.41);z-index:20;animation:fadeIn .12s ease}.drawer{position:fixed;right:0;top:0;bottom:0;width:min(560px,100%);background:#fff;z-index:21;box-shadow:-20px 0 70px rgba(17,24,34,.16);display:flex;flex-direction:column;animation:slideIn .2s ease}.drawer-header{padding:24px 26px 18px;border-bottom:1px solid var(--line)}.drawer-header-row{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.drawer-profile{display:flex;align-items:center;gap:14px}.drawer-profile .student-avatar{width:49px;height:49px;font-size:14px;background:var(--orange-soft);color:var(--orange-dark)}.drawer-title{font-size:21px;font-weight:840;letter-spacing:-.5px}.drawer-sub{font-size:12px;color:var(--muted);margin-top:5px}.icon-button{border:1px solid var(--line);background:#fff;width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:10px;color:var(--muted)}.icon-button:hover{color:var(--ink);background:#f7f7f9}.drawer-tabs{display:flex;gap:4px;padding:13px 26px 0;border-bottom:1px solid var(--line)}.drawer-tab{border:0;border-bottom:3px solid transparent;background:transparent;padding:10px 17px;color:var(--muted);font-size:12px;font-weight:800}.drawer-tab.active{color:var(--orange-dark);border-bottom-color:var(--orange)}.drawer-body{overflow:auto;flex:1;padding:22px 26px 30px}.detail-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:19px}.detail-top h3{margin:0;font-size:16px}.detail-top .detail-sub{color:var(--muted);font-size:12px;margin-top:4px}.check-group{margin-bottom:22px}.check-group-title{font-size:10px;font-weight:850;letter-spacing:1px;text-transform:uppercase;color:#858c97;border-bottom:1px solid var(--line);padding-bottom:9px;margin-bottom:8px}.req-card{border:1px solid var(--line);border-radius:11px;padding:14px 15px;margin-bottom:9px}.req-head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}.req-head-main{display:flex;gap:10px;align-items:flex-start;min-width:0}.req-tag{font-size:10px;color:var(--orange-dark);background:var(--orange-soft);font-weight:850;border-radius:5px;padding:4px 6px;white-space:nowrap}.req-name{font-weight:750;font-size:12px;line-height:1.5}.req-status{margin-top:5px;font-size:10px;color:#949aa4}.req-actions{display:flex;gap:5px;flex-shrink:0;flex-wrap:wrap;justify-content:flex-end}.tiny-btn{padding:6px 9px;font-weight:800;font-size:11px;border-radius:6px;background:white;border:1px solid #dce0e6;white-space:nowrap}.tiny-btn:hover{background:#f7f8fa}.tiny-btn.confirm{background:var(--green-bg);border-color:#d0eadb;color:var(--green)}.tiny-btn.warn{color:var(--yellow)}.tiny-btn.active-warn{background:var(--yellow-bg);border-color:#f6df9c}.ref-box{background:#f8f9fb;border:1px solid #eff0f3;border-radius:8px;padding:12px;margin-top:12px;color:#525b68;line-height:1.6;font-size:12px}.ref-box strong{color:#292d34}.ref-box p{margin:5px 0}.ref-diagram{border:1px solid #ebecf0;background:white;border-radius:7px;padding:8px;margin-top:9px}.ref-diagram svg{width:100%;height:auto;display:block}.ref-link{display:inline-flex;gap:6px;align-items:center;font-size:12px;margin-top:8px}.req-meta{font-size:10px;margin-top:8px;color:#8e96a3}.switch-line{display:inline-flex;align-items:center;gap:8px;font-size:12px;color:#555e6a;font-weight:650}.switch-line input{accent-color:var(--orange)}.comments{margin-top:23px;padding-top:22px;border-top:1px solid var(--line)}.comments h3{font-size:14px;margin:0 0 14px}.comment{padding:11px 12px;background:#f8f9fa;border-radius:9px;margin-bottom:9px}.comment p{font-size:12px;margin:6px 0;line-height:1.55}.comment .meta{color:#8d929d;font-size:10px}.textarea{width:100%;border:1px solid #dfe3e8;border-radius:8px;padding:10px 12px;min-height:79px;resize:vertical;font-size:12px}.textarea:focus{border-color:var(--orange)}.input-label{display:block;margin:0 0 7px;font-size:11px;font-weight:800;color:#626b77}.input{width:100%;border:1px solid #dfe3e8;border-radius:8px;padding:10px 11px;font-size:12px;min-height:40px;background:white}.input:focus{border-color:var(--orange)}.form-row{margin-bottom:15px}.inline-fields{display:grid;grid-template-columns:1fr 1fr;gap:12px}.modal-shell{position:fixed;inset:0;z-index:25;display:flex;align-items:center;justify-content:center;padding:18px;background:rgba(14,17,24,.45)}.modal{background:white;width:min(550px,100%);max-height:min(88vh,850px);overflow:auto;border-radius:16px;box-shadow:0 18px 80px rgba(0,0,0,.2)}.modal.wide{width:min(740px,100%)}.modal-head{padding:22px 24px 17px;border-bottom:1px solid var(--line);display:flex;align-items:flex-start;justify-content:space-between;gap:15px}.modal-head h2{margin:0;font-size:20px;letter-spacing:-.4px}.modal-head p{color:var(--muted);font-size:12px;margin:6px 0 0}.modal-body{padding:21px 24px}.modal-foot{padding:17px 24px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:9px}.partner-line{padding:12px;border:1px solid var(--line);border-radius:9px;display:flex;align-items:center;justify-content:space-between;margin-top:10px;gap:12px}.partner-line label{display:flex;align-items:center;gap:10px;font-size:13px;font-weight:700}.partner-line input{width:17px;height:17px;accent-color:var(--orange)}.alert{padding:12px 14px;border-radius:9px;background:var(--orange-soft);color:#93490f;line-height:1.5;font-size:12px}.alert.gray{background:#f3f5f8;color:#626c79}.alert.green{background:var(--green-bg);color:#226b43}.small-btn-link{background:none;border:0;color:var(--orange-dark);padding:0;font-size:12px;font-weight:750;text-decoration:underline}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.template-row{display:flex;align-items:center;gap:12px;border:1px solid var(--line);padding:13px 15px;border-radius:10px;margin-bottom:8px}.template-row .grow{flex:1;min-width:0}.template-row .strong{font-size:12px;font-weight:800}.template-row .muted{font-size:11px;color:var(--muted);margin-top:4px}.template-list{margin-top:14px}.group-card{border:1px solid var(--line);padding:16px;border-radius:12px;margin-bottom:14px}.group-card-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px}.group-card-head h3{font-size:14px;margin:0}.group-card-actions{display:flex;gap:7px;flex-wrap:wrap}.activity-item{padding:13px 17px;border-left:3px solid #e7e9ee;margin:0 0 10px 15px;background:white;border-radius:0 8px 8px 0;font-size:12px}.activity-item .time{font-size:10px;color:#87909c;margin-top:5px}.stations-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.station-card{padding:18px 16px;border:1px solid var(--line);border-radius:12px;background:white;min-height:117px}.station-card .station-number{font-size:12px;font-weight:850;color:var(--orange-dark)}.station-card .members{margin-top:12px;font-size:12px;line-height:1.8}.station-card.empty{background:#fcfcfd;color:#a8afb7}.station-card.empty .station-number{color:#8f96a0}.station-link{border:0;background:transparent;font-size:12px;padding:2px 0;text-align:left;color:var(--ink);text-decoration:underline;text-decoration-color:#e1e3e5}.toast{position:fixed;bottom:22px;right:22px;max-width:min(370px,calc(100% - 36px));z-index:60;background:#1e232a;color:white;padding:13px 16px;border-radius:10px;box-shadow:0 14px 50px #0003;font-size:12px;animation:fadeIn .15s ease}.hide{display:none!important}.loading{min-height:100vh;display:flex;justify-content:center;align-items:center;gap:15px}.spinner{width:24px;height:24px;border:3px solid #e1e2e5;border-top-color:var(--orange);border-radius:50%;animation:spin .8s linear infinite}.empty-mini{font-size:12px;color:#969da7;padding:18px 0}.badge-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--orange)}.footnote{font-size:11px;line-height:1.55;color:#8b929c;margin-top:12px}.segment-switch{display:flex;background:#f0f2f5;border:1px solid #e6e8ed;border-radius:9px;padding:3px;gap:3px}.segment-switch button{border:none;background:transparent;color:#7b8290;font-weight:750;font-size:12px;padding:8px 12px;border-radius:7px}.segment-switch button.selected{background:#fff;color:#1d222b;box-shadow:0 2px 7px rgba(28,37,47,.07)}.detail-empty{color:var(--muted);background:#f7f8fa;padding:16px;border-radius:9px;font-size:12px}.screen-note{font-size:11px;color:#8e96a1}.row-clickable{cursor:pointer}.textarea:focus,.input:focus{outline:2px solid #ffd4bb}.muted-text{color:var(--muted)}.separator{height:1px;background:var(--line);margin:20px 0}.large-number{font-size:40px;font-weight:850;letter-spacing:-1px;margin:10px 0}.activity-scroll{max-height:580px;overflow:auto}.inline-warning{color:#ab631a;font-size:12px;margin:12px 0}.export-cta{display:flex;flex-wrap:wrap;gap:9px;margin-top:15px}
@keyframes spin{to{transform:rotate(360deg)}}@keyframes fadeIn{from{opacity:0}to{opacity:1}}@keyframes slideIn{from{transform:translateX(15px);opacity:.75}to{transform:translateX(0);opacity:1}}
@media (max-width:1050px){.app-layout{grid-template-columns:74px minmax(0,1fr)}.sidebar{padding:20px 10px}.brand{padding:4px;justify-content:center}.brand-name,.brand-caption,.side-label,.nav-btn span:not(.i),.sidebar-bottom{display:none}.nav-btn{justify-content:center;padding:14px}.nav-btn .i svg{width:21px;height:21px}.workspace{padding:24px 23px 50px}.topbar{padding:0 24px}.stats-grid{gap:10px}.stat-card{padding:13px 14px}.panel-header{padding:17px}}
@media(max-width:760px){.app-layout{display:block}.sidebar{position:fixed;top:auto;bottom:0;left:0;right:0;min-height:0;height:66px;z-index:10;display:flex;flex-direction:row;justify-content:center;gap:0;border-top:1px solid #333;padding:6px 9px}.brand,.side-label,.sidebar-bottom{display:none}.nav-list{display:flex;justify-content:space-around;flex:1;gap:2px}.nav-btn{width:auto;flex:1;padding:12px 6px;justify-content:center}.nav-btn.active{box-shadow:inset 0 -3px var(--orange)}.topbar{height:63px;padding:0 17px}.topbar .breadcrumb{font-size:10px}.topbar .page-name{font-size:15px}.topbar-controls{gap:8px}.topbar-controls .instructor-select{font-size:11px;max-width:90px}.topbar-controls .avatar{display:none}.sync-chip{padding:7px;font-size:10px}.workspace{padding:21px 15px 95px}.hero{display:block;margin-bottom:19px}.hero h1{font-size:24px}.hero-actions{margin-top:15px}.stats-grid{grid-template-columns:repeat(2,1fr);gap:9px}.stat-card{min-height:102px}.stat-card .number{font-size:24px}.panel-header{display:block;padding:17px 15px}.toolbar{margin-top:17px}.search-wrap{min-width:100%;width:100%}.matrix th:first-child{padding-left:15px}.matrix td:first-child{padding-left:13px}.drawer{bottom:0;width:100%}.drawer-header{padding:17px 18px}.drawer-tabs{padding:8px 14px 0}.drawer-body{padding:17px 18px 80px}.drawer-tab{flex:1}.stations-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.form-grid,.inline-fields{grid-template-columns:1fr}.modal-shell{padding:8px}.modal{max-height:93vh}.modal-head,.modal-body,.modal-foot{padding-left:17px;padding-right:17px}}
@media(max-width:390px){.sync-chip{font-size:0;gap:0}.sync-chip .i svg{width:18px}.topbar-controls .instructor-select{max-width:89px}.stat-top{font-size:10px}.stats-grid{gap:7px}.stat-card{padding:12px}}

/* SPATTMAT v0.2 — accessible light/dark appearance modes. */
.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}
.appearance-options{display:flex;gap:10px;flex-wrap:wrap;border:0;margin:14px 0 0;padding:0}
.appearance-option{cursor:pointer;display:flex;align-items:center;gap:9px;background:var(--white);border:1px solid var(--line);border-radius:10px;padding:12px 18px;min-width:120px;color:var(--ink);font-size:13px;font-weight:700}
.appearance-option:has(input:checked){border-color:var(--orange);box-shadow:0 0 0 1px var(--orange);background:var(--orange-soft)}
.appearance-option:has(input:focus-visible){outline:3px solid var(--orange);outline-offset:2px}
.appearance-option input{margin:0;width:16px;height:16px;accent-color:var(--orange)}
:root[data-theme="dark"]{
  --orange:#ff7027;--orange-dark:#ff9e6c;--orange-soft:#40271b;
  --ink:#eef1f6;--muted:#a7b0bd;--line:#343b47;
  --background:#13161c;--white:#20252e;
  --green:#6bdba0;--green-bg:#193c2d;
  --yellow:#f5c06b;--yellow-bg:#433217;
  --red:#ff9295;--red-bg:#48252d;
  --shadow:0 5px 22px rgba(0,0,0,.17)
}
:root[data-theme="dark"] .sidebar{background:#101318;border-right:1px solid #313641}
:root[data-theme="dark"] .topbar,
:root[data-theme="dark"] .panel,
:root[data-theme="dark"] .stat-card,
:root[data-theme="dark"] .drawer,
:root[data-theme="dark"] .modal,
:root[data-theme="dark"] .station-card,
:root[data-theme="dark"] .activity-item,
:root[data-theme="dark"] .btn,
:root[data-theme="dark"] .icon-button,
:root[data-theme="dark"] .tiny-btn,
:root[data-theme="dark"] .field,
:root[data-theme="dark"] .search-field,
:root[data-theme="dark"] .input,
:root[data-theme="dark"] .textarea{background:var(--white);color:var(--ink)}
:root[data-theme="dark"] .btn-primary,
:root[data-theme="dark"] .btn-primary:hover{background:#f5681e;border-color:#f5681e;color:#11161d}
:root[data-theme="dark"] .btn-dark{background:#343b47;color:var(--ink);border-color:#434e5d}
:root[data-theme="dark"] .btn:hover:not(.btn-primary){background:#2b323e;border-color:#566172}
:root[data-theme="dark"] .stat-icon,
:root[data-theme="dark"] .student-avatar,
:root[data-theme="dark"] .pill.gray,
:root[data-theme="dark"] .pill:not(.green):not(.orange):not(.yellow):not(.red):not(.gray),
:root[data-theme="dark"] .segment-switch,
:root[data-theme="dark"] .detail-empty{background:#2b323c;color:#c6cdd7}
:root[data-theme="dark"] .stat-icon.orange,
:root[data-theme="dark"] .drawer-profile .student-avatar{background:var(--orange-soft);color:var(--orange-dark)}
:root[data-theme="dark"] .stat-icon.green{background:var(--green-bg);color:var(--green)}
:root[data-theme="dark"] .matrix th{background:#282e38;color:#d0d7e1}
:root[data-theme="dark"] .matrix td{border-bottom-color:#343b47}
:root[data-theme="dark"] .matrix tbody tr:hover{background:#302923}
:root[data-theme="dark"] .student-sub,
:root[data-theme="dark"] .check-group-title,
:root[data-theme="dark"] .req-status,
:root[data-theme="dark"] .req-meta,
:root[data-theme="dark"] .comment .meta,
:root[data-theme="dark"] .small-help,
:root[data-theme="dark"] .screen-note,
:root[data-theme="dark"] .footnote{color:#b3bdca}
:root[data-theme="dark"] .cell-btn{color:var(--ink)}
:root[data-theme="dark"] .cell-btn:hover{background:var(--orange-soft);border-color:#815039}
:root[data-theme="dark"] .ref-box{background:#292f39;border-color:#414a59;color:#d4dbe6}
:root[data-theme="dark"] .ref-box strong{color:#f2f5f8}
/* Technical diagrams intentionally use white paper so dark styling does not invert circuit annotations. */
:root[data-theme="dark"] .ref-diagram{background:#fff;border-color:#4b5360;color:#21262f}
:root[data-theme="dark"] .comment{background:#2a303a}
:root[data-theme="dark"] .tiny-btn:hover,
:root[data-theme="dark"] .icon-button:hover{background:#303847}
:root[data-theme="dark"] .tiny-btn.confirm{background:var(--green-bg);border-color:#315943;color:var(--green)}
:root[data-theme="dark"] .tiny-btn.active-warn{background:var(--yellow-bg);border-color:#6d5531;color:var(--yellow)}
:root[data-theme="dark"] .input-label,
:root[data-theme="dark"] .switch-line{color:#c0c8d4}
:root[data-theme="dark"] .station-card.empty{background:#1a1e25;color:#a5afbc}
:root[data-theme="dark"] .station-card.empty .station-number{color:#9ba6b6}
:root[data-theme="dark"] .station-link{color:var(--ink);text-decoration-color:#677080}
:root[data-theme="dark"] .activity-item{border-left-color:#4a5360}
:root[data-theme="dark"] .sync-chip{background:#362a20;color:#f7bd91;border-color:#68452b}
:root[data-theme="dark"] .alert{background:var(--orange-soft);color:#ffbd91}
:root[data-theme="dark"] .alert.gray{background:#2a303a;color:#d1dae4}
:root[data-theme="dark"] .alert.green{background:var(--green-bg);color:var(--green)}
:root[data-theme="dark"] .segment-switch{border-color:var(--line)}
:root[data-theme="dark"] .segment-switch button{color:#bac3ce}
:root[data-theme="dark"] .segment-switch button.selected{background:#434b58;color:#fff}
:root[data-theme="dark"] .modal-shell{background:rgba(0,0,0,.68)}
:root[data-theme="dark"] .appearance-option{background:var(--white)}
:root[data-theme="dark"] .appearance-option:has(input:checked){background:var(--orange-soft)}
:root[data-theme="dark"] select option{background:#222832;color:#eef1f6}
@media(max-width:530px){.appearance-option{min-width:0;flex:1;justify-content:center;padding:12px 8px}}

/* v0.4 authentication and account management */
.auth-backdrop {min-height:100vh;min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:24px;background:var(--bg, #f6f7f8);}
.auth-card {background:var(--surface, #fff);color:var(--text, #202329);border:1px solid var(--line,#dedfe3);border-radius:18px;box-shadow:0 12px 48px rgba(0,0,0,.1);padding:32px;width:min(100%,420px);display:flex;flex-direction:column;gap:12px;}
.auth-card h1{font-size:25px;margin:4px 0 0}.auth-card p{color:var(--muted,#888);margin:0 0 10px}.auth-card label,.account-form label{font-size:13px;font-weight:600;display:flex;flex-direction:column;gap:7px}
.auth-card input{border:1px solid var(--line,#ccc);border-radius:9px;padding:12px;background:var(--surface,#fff);color:var(--text,#111);font:inherit;min-width:0}
.auth-submit{justify-content:center;padding:12px;margin-top:8px}.auth-error{color:#e16957;font-size:13px;min-height:18px}.auth-mark{width:46px;height:46px;background:#fe5c00;border-radius:12px;color:#fff;font-weight:800;display:grid;place-items:center}.auth-footer{font-size:11px;color:var(--muted,#888);text-align:center}
.signed-in-name{font-size:12px;color:var(--text,#222);white-space:nowrap}.signout-btn{font-size:12px;padding:8px 12px}.account-form{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}.account-form button{align-self:end;justify-self:start}.account-form input,.account-form select{width:100%;min-width:0}
@media(max-width:760px){.signed-in-name{display:none}.signout-btn{font-size:11px;padding:6px 8px}.account-form{grid-template-columns:1fr}.auth-card{padding:24px}}

/* v0.4.1 invitation screens and admin invitations */
.invite-identity{display:flex;flex-direction:column;gap:4px;border:1px solid var(--line);background:var(--surface);border-radius:9px;padding:12px;margin-bottom:7px}
.invite-identity span{font-size:12px;color:var(--muted)}
.invite-result{margin-top:20px;padding:15px;background:var(--orange-soft);border-radius:10px;display:flex;flex-direction:column;gap:9px}
.invite-result input{width:100%;min-width:0}
.invites-list{margin-top:15px;display:flex;flex-direction:column;gap:9px}
.invite-row{display:flex;gap:10px;justify-content:space-between;align-items:center;padding:12px;border:1px solid var(--line);border-radius:10px}
.invite-row .muted{font-size:12px;margin-top:4px}

/* v0.4.4 — clear account and invitation status groups. */
.account-section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.account-section-head .section-title{margin:0}
.account-row-main{min-width:0;overflow-wrap:anywhere}
.account-row-meta{font-size:12px;color:var(--muted);margin-top:5px;line-height:1.6}
.account-row-meta .pill{font-size:10px;vertical-align:middle}
.account-empty{font-size:12px;color:var(--muted);padding:13px 15px;border:1px dashed var(--line);border-radius:10px;margin:0}
@media(max-width:530px){.invite-row{align-items:flex-start;flex-wrap:wrap}.invite-row>.btn{margin-left:auto}}