:root{--ink:#163b73;--blue:#0e4da4;--blue2:#0b5fc7;--bg:#f3f7fc;--card:#fff;--line:#d8e3f0;--muted:#64748b;--text:#172033;--ok:#087443;--warn:#9a6500;--bad:#a61b1b;--shadow:0 12px 35px #15375f12}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,"Segoe UI",Arial,sans-serif;background:var(--bg);color:var(--text)}button,input,select,textarea{font:inherit}.hidden{display:none!important}button,.btn{border:0;border-radius:10px;background:var(--blue);color:#fff;font-weight:700;padding:10px 14px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:6px}button:hover,.btn:hover{filter:brightness(.96)}button:disabled{opacity:.55;cursor:not-allowed}.outline{background:#fff;color:var(--ink);border:1px solid var(--line)}.secondary{background:#edf4fc!important;color:var(--ink)!important}.danger{background:#fff0f0!important;color:var(--bad)!important}.success{background:#e8f7ef!important;color:var(--ok)!important}.warnbtn{background:#fff6df!important;color:#865c00!important}input,select,textarea{width:100%;border:1px solid #cdd9e8;border-radius:10px;padding:10px 12px;background:#fff;color:var(--text);outline:none}input:focus,select:focus,textarea:focus{border-color:#4b83c9;box-shadow:0 0 0 3px #3f7fc21a}textarea{min-height:110px;resize:vertical}label{display:block;font-weight:650;color:#26354a}label>input,label>select,label>textarea{margin-top:6px}.muted,small{color:var(--muted)}.msg{min-height:22px;margin-top:10px;color:var(--bad)}.login-shell{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:min(430px,100%);background:#fff;border:1px solid var(--line);border-radius:24px;padding:36px;box-shadow:var(--shadow)}.login-card img{width:66px;height:66px}.login-card h1{font-size:38px;color:var(--ink);margin:25px 0 10px}.login-card p{color:var(--muted);font-size:17px;line-height:1.45;margin:0 0 24px}.login-card label{margin:14px 0}.login-card input{font-size:16px;padding:13px}.login-card button{font-size:16px;margin-top:4px}.app{min-height:100vh}header{background:#fff;border-bottom:1px solid var(--line);padding:20px 32px;display:flex;justify-content:space-between;align-items:center;gap:20px;position:sticky;top:0;z-index:8}.brand{display:flex;align-items:center;gap:14px}.brand img{width:60px;height:60px}.brand b{font-size:13px;letter-spacing:1.2px;color:var(--blue)}.brand h1{margin:3px 0 0;color:var(--ink);font-size:28px}.brand small{display:block;margin-top:3px}.head-actions{display:flex;align-items:center;justify-content:flex-end;gap:10px;flex-wrap:wrap}.head-actions>span{color:var(--muted);font-size:14px}nav{display:flex;gap:8px;padding:18px 32px 0;overflow:auto}nav button{white-space:nowrap;background:#fff;color:var(--ink);border:1px solid var(--line)}nav button.active{background:var(--blue);color:#fff;border-color:var(--blue)}.action-bar{padding:16px 32px 8px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}.action-bar .spacer{flex:1}.toolbar{padding:8px 32px 14px;display:grid;grid-template-columns:minmax(260px,1.5fr) repeat(4,minmax(140px,.55fr));gap:10px}.toolbar.empty{display:none}main{padding:0 32px 40px}.overview-grid{display:grid;grid-template-columns:repeat(5,minmax(150px,1fr));gap:12px;margin-bottom:20px}.stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:17px;box-shadow:0 2px 8px #163b7308;cursor:pointer;transition:.15s}.stat:hover{transform:translateY(-1px);border-color:#aac3e0}.stat span{display:block;color:var(--muted);font-size:13px}.stat b{display:block;color:var(--ink);font-size:28px;margin-top:5px}.overview-panels{display:grid;grid-template-columns:1.1fr .9fr;gap:16px}.panel{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}.panel h3{margin:0 0 13px;color:var(--ink)}.quick-list{display:grid;gap:9px}.quick-row{display:flex;align-items:center;justify-content:space-between;gap:10px;border:1px solid #e6edf6;border-radius:11px;padding:10px 12px}.quick-row .meta{min-width:0}.quick-row b{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.quick-row small{display:block;margin-top:3px}.table-card{overflow:auto;background:#fff;border:1px solid var(--line);border-radius:15px;box-shadow:0 2px 8px #163b7306}table{border-collapse:collapse;width:100%;min-width:1080px}th,td{padding:12px 13px;border-bottom:1px solid #e8eef6;text-align:left;vertical-align:top;font-size:14px}th{background:#f8fbff;color:var(--ink);position:sticky;top:0;z-index:1}tbody tr:hover{background:#fbfdff}td small{display:block;margin-top:4px}.linklike{border:0;background:transparent!important;color:var(--blue)!important;padding:0!important;text-align:left;font-weight:750;cursor:pointer}.badges{display:flex;gap:5px;flex-wrap:wrap}.badge{display:inline-block;padding:4px 8px;border-radius:999px;background:#edf3fa;color:var(--ink);font-size:12px;font-weight:700}.badge.ok{background:#e6f7ee;color:var(--ok)}.badge.warn{background:#fff4d8;color:var(--warn)}.badge.bad{background:#fdeaea;color:var(--bad)}.badge.muted{background:#eef1f5;color:#64748b}.actions{display:flex;gap:6px;flex-wrap:wrap}.actions button,.actions .btn{font-size:12px;padding:7px 9px}.empty{text-align:center;color:var(--muted);padding:42px}.loading{text-align:center;color:var(--muted);padding:48px}.modal{position:fixed;inset:0;background:#0f1f3578;display:grid;place-items:center;padding:18px;z-index:30}.modal-card{width:min(1050px,100%);max-height:92vh;overflow:auto;background:#fff;border-radius:20px;padding:24px;position:relative;box-shadow:0 20px 70px #0003}.modal-card h2{margin:0 42px 18px 0;color:var(--ink)}.modal-card h3{color:var(--ink);margin:21px 0 10px}.x{position:absolute;right:13px;top:11px;background:transparent;color:#555;font-size:26px;padding:5px 9px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.form-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.span2{grid-column:1/-1}.check-row{display:flex;gap:8px;flex-wrap:wrap}.check{display:flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:9px;padding:7px 9px;font-weight:600;background:#fff}.check input{width:auto;margin:0}.section{border-top:1px solid var(--line);margin-top:18px;padding-top:16px}.section:first-child{border-top:0;margin-top:0;padding-top:0}.detail-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;flex-wrap:wrap}.detail-title b{font-size:19px;color:var(--ink)}.detail-title small{display:block;margin-top:4px}.kv{display:grid;grid-template-columns:170px 1fr;gap:8px 12px;font-size:14px}.kv>div:nth-child(odd){color:var(--muted)}.device-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.device{padding:12px;border:1px solid var(--line);border-radius:12px}.device.revoked{opacity:.65;background:#f7f8fa}.device b{display:block}.device small{display:block;margin-top:3px;word-break:break-word}.subtable{overflow:auto;border:1px solid var(--line);border-radius:12px}.subtable table{min-width:720px}.bulk-preview{overflow:auto;border:1px solid var(--line);border-radius:12px;max-height:420px}.bulk-preview table{min-width:900px}.bulk-preview select,.bulk-preview input{padding:7px;font-size:13px}.notice{padding:11px 13px;border-radius:10px;background:#f0f6ff;color:var(--ink);border:1px solid #d6e6fa;margin:10px 0}.notice.warn{background:#fff8e8;color:#7a5700;border-color:#f3dfa7}.notice.bad{background:#fff0f0;color:#8f1717;border-color:#f3cccc}.toast{position:fixed;right:20px;bottom:20px;background:#152c4d;color:#fff;padding:12px 16px;border-radius:12px;box-shadow:0 10px 30px #0003;z-index:60;max-width:420px}.toast.bad{background:#8f1d1d}.result-ok{color:var(--ok);font-weight:700}.result-bad{color:var(--bad);font-weight:700}@media(max-width:1150px){.toolbar{grid-template-columns:1fr 1fr 1fr}.toolbar .searchbox{grid-column:1/-1}.overview-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:760px){header{padding:16px;align-items:flex-start;flex-direction:column;position:static}.head-actions{justify-content:flex-start}.brand h1{font-size:23px}nav,.action-bar,.toolbar,main{padding-left:16px;padding-right:16px}.toolbar{grid-template-columns:1fr}.overview-grid{grid-template-columns:repeat(2,1fr)}.overview-panels{grid-template-columns:1fr}.form-grid,.form-grid.three,.device-grid{grid-template-columns:1fr}.kv{grid-template-columns:1fr}.kv>div:nth-child(odd){font-weight:700;color:var(--ink);margin-top:6px}.modal{padding:8px}.modal-card{padding:18px;border-radius:14px}.login-card{padding:26px}.login-card h1{font-size:31px}}

/* Final mobile/accessibility hardening */
body.modal-open{overflow:hidden}.app,main,.panel,.table-card,.subtable,.bulk-preview,.form-grid>*{min-width:0}.table-card,.subtable,.bulk-preview{max-width:100%;-webkit-overflow-scrolling:touch;overscroll-behavior-inline:contain}.modal-card{min-width:0;overscroll-behavior:contain;-webkit-overflow-scrolling:touch}.modal-card input,.modal-card select,.modal-card textarea{min-width:0;max-width:100%}.stat:focus-visible{outline:3px solid #4b83c955;outline-offset:2px}.x:focus-visible,button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #4b83c944;outline-offset:2px}
@media(max-width:760px){
  html,body{max-width:100%;overflow-x:hidden}.action-bar{align-items:stretch}.action-bar button,.action-bar .btn{flex:0 1 auto}.action-bar .spacer{display:none}.action-bar .muted{width:100%}
  .overview-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.stat{padding:14px}.stat b{font-size:24px}.stat span{font-size:12px}
  .modal{align-items:end;padding:8px}.modal-card{width:100%;max-height:calc(100dvh - 16px);border-radius:16px 16px 10px 10px;padding:18px 14px}.modal-card h2{font-size:20px;margin-right:44px}.x{position:sticky;float:right;right:0;top:0;z-index:3;background:#fff;border:1px solid var(--line)}
  .bulk-preview{max-height:48dvh}.subtable table{min-width:680px}.device{overflow-wrap:anywhere}.quick-row{align-items:flex-start}.quick-row button{flex:none}
  .head-actions{width:100%}.head-actions>span{width:100%;overflow-wrap:anywhere}.head-actions button,.head-actions .btn{flex:1 1 auto}
}
@media(max-width:420px){.overview-grid{grid-template-columns:1fr 1fr}.login-shell{padding:12px}.login-card{padding:22px 18px}.brand img{width:50px;height:50px}.brand h1{font-size:21px}.action-bar,nav,.toolbar,main{padding-left:10px;padding-right:10px}.modal{padding:0}.modal-card{max-height:100dvh;border-radius:0;padding:16px 12px}.actions{gap:5px}.actions button,.actions .btn{font-size:12px}.toast{left:10px;right:10px;bottom:10px;max-width:none}}

/* Center V2 permission + density upgrade */
.overview-grid{grid-template-columns:repeat(6,minmax(118px,1fr));gap:9px}.stat{padding:12px 13px;border-radius:13px}.stat span{font-size:12px}.stat b{font-size:23px;margin-top:3px}
.table-card>table{min-width:0;table-layout:auto}.table-card>table th,.table-card>table td{padding:9px 8px;font-size:13.5px}.student-table td:nth-child(1),.class-table td:nth-child(1),.teacher-table td:nth-child(1){width:44px;text-align:center}.student-table td:nth-child(2),.teacher-table td:nth-child(2){white-space:nowrap}.class-table td:nth-child(6){text-align:center}.table-card small{font-size:11.5px}
.permission-modules{display:grid;gap:12px;margin-top:14px}.perm-module{border:1px solid var(--line);border-radius:12px;padding:11px;background:#fbfdff}.perm-module-head{width:100%;justify-content:flex-start;background:#f1f6fd}.perm-module-head small{margin-left:auto}.perm-items{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;margin-top:9px}.perm-items .check{font-size:13px;align-items:flex-start;overflow-wrap:anywhere}.perm-items input:disabled+*{opacity:.6}
.searchbox{min-height:42px}.form-grid label input[list]{background:#fff}
@media(max-width:1300px){.overview-grid{grid-template-columns:repeat(4,minmax(120px,1fr))}.table-card>table th,.table-card>table td{padding:8px 7px;font-size:13px}.perm-items{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.overview-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.stat{padding:11px}.table-card>table{min-width:820px}.class-table>table{min-width:760px}.teacher-table>table{min-width:860px}.perm-items{grid-template-columns:1fr}.permission-modules{gap:9px}.perm-module{padding:9px}.modal-card{font-size:14px}.modal-card input,.modal-card select,.modal-card textarea{font-size:16px}}

/* Center V2 refinement 2026-10-17 */
.searchbox{position:relative;z-index:2;pointer-events:auto!important;user-select:text!important;-webkit-user-select:text!important}
.searchbox::-webkit-search-cancel-button{cursor:pointer}
.overview-subtabs{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:10px}.overview-subtabs button{padding:8px 12px;background:#fff;color:var(--ink);border:1px solid var(--line)}.overview-subtabs button.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.permission-actions{position:sticky;top:-1px;z-index:2;background:#fff;padding:8px 0;border-bottom:1px solid #edf2f8}
.perm-module-head input{transform:scale(1.05)}
.row-no{display:inline-grid;place-items:center;min-width:24px;height:24px;border-radius:999px;background:#edf3fa;color:var(--ink);font-size:12px;font-weight:800}
@media(min-width:1100px){.student-table>table,.class-table>table,.teacher-table>table{width:100%;min-width:0}.student-table th:nth-child(4),.student-table td:nth-child(4){max-width:230px}.teacher-table th:nth-child(7),.teacher-table td:nth-child(7){max-width:260px}.table-card td{overflow-wrap:anywhere}}

/* Center V2 refinement 4: compact overview + edition groups + bulk actions */
.overview-grid.compact{grid-template-columns:repeat(6,minmax(105px,1fr))!important;gap:8px!important;margin-bottom:12px!important}
.overview-grid.compact .stat{padding:9px 11px!important;min-height:72px;border-radius:12px!important;display:flex;flex-direction:column;justify-content:center}
.overview-grid.compact .stat span{font-size:11.5px!important;line-height:1.2}
.overview-grid.compact .stat b{font-size:21px!important;line-height:1.05;margin-top:4px!important}
.overview-subtabs{margin-bottom:8px!important}
.overview-panels{gap:12px}.overview-panels .panel{padding:14px}
.perm-edition{border:1px solid #cbdcf0;border-radius:14px;padding:10px;background:#f7fbff;display:grid;gap:9px}
.perm-edition+.perm-edition{margin-top:10px}.perm-edition-head{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;padding:3px 4px}
.perm-edition-head b{font-size:16px;color:var(--ink)}.perm-edition-head small{display:block;margin-top:2px}.perm-edition .perm-module{background:#fff}
.bulk-apply{display:grid;gap:7px;margin:10px 0 12px;padding:10px 12px;border:1px solid var(--line);border-radius:11px;background:#f8fbff}.bulk-apply .actions{gap:7px}
@media(max-width:1050px){.overview-grid.compact{grid-template-columns:repeat(4,minmax(105px,1fr))!important}}
@media(max-width:760px){.overview-grid.compact{grid-template-columns:repeat(2,minmax(0,1fr))!important}.overview-grid.compact .stat{min-height:66px;padding:9px!important}.perm-edition-head{align-items:flex-start}.perm-edition-head .actions{width:100%}}

/* 2026-10-17: multi-HSK content permission editor */
.permission-step{border:1px solid var(--line);border-radius:14px;padding:14px;margin:12px 0;background:#fff}
.permission-step-title{display:flex;flex-direction:column;gap:3px;margin-bottom:10px;color:var(--ink)}
.permission-step-title small{color:var(--muted);font-weight:500}
.permission-level-picker{margin:8px 0 10px}
.permission-level-picker .check{min-width:82px;justify-content:center}
.permission-level-panels{display:grid;gap:12px}
.perm-level-card{border:1px solid #dbe6f3;border-radius:14px;background:#fbfdff;padding:13px}
.perm-level-card.hidden{display:none}
.perm-level-card-head{display:grid;grid-template-columns:minmax(150px,.45fr) minmax(220px,.55fr);gap:12px;align-items:end;margin-bottom:10px}
.perm-level-card-head>div>b{font-size:18px;color:var(--blue)}
.perm-level-card-head>div>small{display:block;margin-top:3px;color:var(--muted)}
.permission-save-bar{position:sticky;bottom:-1px;z-index:4;background:#fff;padding:12px 0 4px;border-top:1px solid #edf2f8;margin-top:12px}
@media(max-width:760px){.perm-level-card-head{grid-template-columns:1fr}.permission-level-picker .check{min-width:0;flex:1 1 86px}.permission-step{padding:11px}.perm-level-card{padding:10px}}


/* NEW V2 Center · Dung lượng & Lưu trữ · 2026-10-18 */
.wq-storage-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-bottom:14px}
.wq-storage-grid>.panel{min-width:0}
.wq-storage-hero{display:flex;flex-direction:column;gap:10px}
.wq-storage-amount{font-weight:900;font-size:36px;line-height:1.12;color:var(--ink)}
.wq-storage-amount small{font-size:17px;font-weight:500;color:var(--muted)}
.wq-storage-track{height:16px;background:#e8eff7;border-radius:999px;overflow:hidden}
.wq-storage-track span{display:block;height:100%;background:#1b9f77;border-radius:999px;transition:width .3s ease}
.wq-storage-track.caution span{background:#ca8b1f}
.wq-storage-track.high span{background:#e16d2f}
.wq-storage-track.critical span{background:#bc3838}
.wq-storage-between,.wq-storage-markers{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px}
.wq-storage-markers{color:var(--muted);font-size:12px}
.wq-storage-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:9px 0}
.wq-storage-stats>div{background:#f5f9fe;border:1px solid #e3edf8;border-radius:10px;padding:10px;min-width:0}
.wq-storage-stats span{display:block;color:var(--muted);font-size:12px}
.wq-storage-stats b{display:block;margin-top:2px;font-size:23px;color:var(--ink)}
@media(max-width:950px){.wq-storage-grid{grid-template-columns:1fr}}
@media(max-width:520px){.wq-storage-amount{font-size:29px}.wq-storage-stats{grid-template-columns:repeat(2,minmax(0,1fr))}.wq-storage-amount small{font-size:15px}}

/* Keep Owner-only management tab hidden regardless of button display styles. */
#adminManagementNav[hidden] { display:none !important; }