/* ===== Giáo viên - bản online ===== */
.mono { font-family: var(--mono); }
.chip { display: inline-flex; align-items: center; gap: 8px; height: 32px; padding: 0 6px 0 12px; border-radius: 99px; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.22); color: #fde68a; font-weight: 700; font-size: 13.5px; max-width: 100%; }
.chip.roomchip { padding-right: 14px; color: #fff; }
.chip.roomchip .i { color: #fbbf24; }
.chip .mono { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 34vw; }
.chip button { height: 22px; border: 0; border-radius: 99px; padding: 0 10px; background: rgba(255,255,255,.18); color: #fff; font-weight: 600; font-size: 11.5px; cursor: pointer; }
.chip button:hover { background: rgba(255,255,255,.3); }
.urlbox { gap: 8px; }

.gate { min-height: calc(100vh - 140px); display: grid; place-items: center; padding: 24px 16px; }
.gatecard { background: #fff; border-radius: 18px; padding: 26px; width: min(520px, 100%); display: flex; flex-direction: column; gap: 14px; box-shadow: 0 16px 50px rgba(15,39,66,.16); border: 1px solid var(--line); }
.gatecard .gt { display: flex; gap: 14px; align-items: center; }
.gatecard h2 { margin: 0 0 2px; font-size: 22px; } .gatecard p { margin: 0; color: var(--muted); font-size: 13.5px; }
.gatecard .inp { width: 100%; }
.logo.big { background: linear-gradient(135deg, #f59e0b, #dc6b2f); }
.recent { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; color: var(--muted); font-size: 13px; }
#recentList { display: flex; gap: 6px; flex-wrap: wrap; }
.rchip { border: 1px solid var(--line); background: #f8fafc; border-radius: 99px; padding: 4px 12px; font: 600 13px var(--mono); cursor: pointer; }
.rchip:hover { background: var(--blue-l); border-color: var(--blue); }

.acts { white-space: nowrap; text-align: right; }
.dlg.small { width: min(980px, 100%); height: min(720px, 100%); }
.dlg-body.one { grid-template-columns: 1fr; }
.qrcard { background: #fff; border-radius: 18px; padding: 22px; width: min(360px, 92vw); text-align: center; display: flex; flex-direction: column; gap: 10px; align-items: center; box-shadow: 0 24px 70px rgba(0,0,0,.4); }
.qrcard h3 { margin: 0; } .qrcard p { margin: 0; color: var(--muted); font-size: 13px; }
#qrBox { width: 260px; max-width: 80vw; } #qrBox svg { width: 100%; height: auto; }
#qrUrl { font-size: 12px; word-break: break-all; color: #475569; }
#qrDlg { display: grid; } #qrDlg[hidden] { display: none; }

@media (max-width: 1000px) { .urlbox { display: flex; } }
@media (max-width: 820px) {
  .tabs { padding: 0 6px; overflow-x: auto; top: 50px; } .tabbtn { padding: 0 12px; flex: none; } .tabbtn .lbl { display: inline; }
  .tabpane { padding: 12px 10px 24px; }
  .urlbox { order: 3; flex: 1 1 100%; justify-content: flex-start; flex-wrap: wrap; } .topbar { flex-wrap: wrap; gap: 8px 10px; position: static; }
  .tabs { position: static; }
  .stats { gap: 8px; } .stat { min-width: 0; flex: 1 1 28%; padding: 8px 10px; } .stat b { font-size: 20px; }
  .toolbar { width: 100%; } .toolbar .inp, .toolbar select.inp { flex: 1 1 100%; width: 100%; }
  .toolbar .btn { flex: 1; justify-content: center; } .toolbar .lbl { display: inline; }
  .grid { grid-template-columns: 1fr; }
  .modal { padding: 0; } .dlg { height: 100%; border-radius: 0; } .dlg.small { height: 100%; }
  .dlg-head { padding: 8px 10px; gap: 8px; } .dlg-head .lbl { display: none; } .dlg-head .btn { padding: 0 12px; }
  .dlg-body { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; } .dlg-body.one { grid-template-rows: 1fr; }
  .dpane + .dpane { border-left: 0; border-top: 1px solid var(--line); }
  .tbl th:nth-child(3), .tbl td:nth-child(3) { display: none; }
  .tbl .btn.small { height: 32px; } .acts { white-space: normal; }
  .switch b { font-size: 13px; }
  .panel-head { gap: 8px; } .panel-head h2 { font-size: 18px; }
  .gate { min-height: 60vh; padding: 12px; } .gatecard { padding: 18px; }
  .credit-bar { font-size: 11px; }
}

.loginlinks { display: flex; gap: 8px; justify-content: center; align-items: center; flex-wrap: wrap; font-size: 13px; color: var(--muted); }
.loginlinks a, .linkbtn { color: var(--blue); font: inherit; font-weight: 600; text-decoration: none; background: none; border: 0; padding: 0; cursor: pointer; }
.loginlinks a:hover, .linkbtn:hover { text-decoration: underline; }
.gatecard .jactions .btn { flex: 1; justify-content: center; }
.okmsg { padding: 10px 14px; background: var(--green-l); color: var(--green-d); border-radius: 8px; font-weight: 600; }

.adminwrap { padding: 20px 22px 30px; } .adminin { max-width: 1000px; margin: 0 auto; }
.adbox { margin: 0 0 18px; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 16px; box-shadow: 0 1px 3px rgba(15,23,42,.05); } .adbox h3 { margin: 0 0 10px; }
.adrow { display: grid; grid-template-columns: 1fr 1.2fr 1.2fr; gap: 12px; } .adrow .inp { width: 100%; }
.pwrow { display: flex; gap: 8px; } .pwrow .inp { flex: 1; min-width: 0; }
.adact { margin-top: 12px; } .adnote { color: var(--muted); font-size: 13px; line-height: 1.55; }
.adcred { padding: 12px 14px; background: var(--green-l); color: var(--green-d); border-radius: 10px; line-height: 1.7; }
.adcred b { font-family: var(--mono); background: #fff; padding: 1px 8px; border-radius: 6px; }
.adbad { padding: 10px 14px; background: var(--red-l); color: var(--red-d); border-radius: 8px; font-weight: 600; }
@media (max-width: 820px) { .adminwrap { padding: 12px 10px; } .adrow { grid-template-columns: 1fr; } .pwrow { flex-wrap: wrap; } }