/* v2.6.0: nhóm tên + Thoát, nút Google, Nạp điểm, bảng bài làm cả lớp, nhắn tin, Trợ lý AI có phí */
.ugrp{display:inline-flex;align-items:center;border:1px solid var(--line);border-radius:999px;background:var(--surface);padding:2px;gap:0}
.ugrp>.btn{border-radius:999px;min-height:32px}
.ugrp>.btn+.btn,.ugrp>.unm2+.btn{border-left:1px solid var(--line);border-top-left-radius:0;border-bottom-left-radius:0}
.ugrp>.unm{border-top-right-radius:0;border-bottom-right-radius:0}
.ugrp .unm2{max-width:140px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:0 10px}
.gbtn{width:100%;justify-content:center;gap:10px;font-weight:700;margin:6px 0 2px}
.gic{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;background:#fff;color:#4285f4;font:800 14px/1 Arial,sans-serif;border:1px solid #dadce0}
.btn.pri .gic{border-color:transparent}
.orl{display:flex;align-items:center;gap:10px;color:var(--mute);font-size:.85rem;margin:8px 0}
.orl::before,.orl::after{content:"";flex:1;height:1px;background:var(--line)}
.umenu .umnap small b{color:var(--pri)}
/* Nạp điểm */
.nap-g{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.nap-g .ic{font-size:2rem}
.nap-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
.nap-top small{display:block;color:var(--mute)}.nap-top b{display:block;font-size:2.1rem;line-height:1.1;color:var(--pri)}
.nap-packs{min-height:80px}
/* Chip giá AI có phí */
.paid{display:inline-flex;align-items:center;gap:4px;font-size:.75rem;font-weight:700;color:var(--fg);background:var(--acc-t);border:1px solid var(--acc);border-radius:999px;padding:1px 8px;vertical-align:middle}
.ai-out{width:100%;min-height:96px;resize:vertical;overflow:hidden;line-height:1.55}
.ai-tools{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-top:8px}
/* Nhắn tin riêng */
.msgb{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;border:1px solid var(--line);background:var(--surface);cursor:pointer;font-size:15px;vertical-align:middle;padding:0}
.msgb:hover{background:var(--surface2)}.msgb[data-n]:not([data-n="0"])::after{content:attr(data-n);position:relative;top:-10px;left:-4px;font-size:.65rem;background:var(--pri);color:#fff;border-radius:999px;padding:0 4px}
.msg-list{max-height:40vh;overflow:auto;display:flex;flex-direction:column;gap:8px;margin:8px 0}
.msg-it{background:var(--surface2);border-radius:12px;padding:8px 10px;display:flex;gap:8px;align-items:flex-start}
.msg-it .t{flex:1}.msg-it small{display:block;color:var(--mute)}
/* Nhận xét của cô theo từng bài */
.nxl{display:flex;flex-direction:column;gap:6px;margin-top:8px}
.nxl .it{border-top:1px dashed var(--line);padding:8px 0}
.nxl .it .h{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.nxl .it .h b{flex:1;min-width:160px}
/* Bảng bài làm cả lớp */
.bb-head{display:flex;gap:10px;align-items:flex-start;flex-wrap:wrap}
.bb-tab{font-size:.9rem}
.bb-tab th{white-space:nowrap}
.bb-tab td.v{min-width:120px}
.bb-tab .vd{display:flex;flex-direction:column;gap:2px;font-size:.82rem;line-height:1.3}
.bb-tab .vd .ok{color:var(--ok);font-weight:700}.bb-tab .vd .no{color:var(--bad);font-weight:700}
.bb-tab .chua{color:var(--mute);font-style:italic}
.bb-tab .dash{color:var(--mute)}
.seen{position:relative}
.seen.on{background:var(--pri-t);border-color:var(--pri);color:var(--pri-d)}
.seen .cnt{display:inline-grid;place-items:center;min-width:18px;height:18px;border-radius:999px;background:var(--pri);color:#fff;font-size:.7rem;padding:0 4px;margin-left:2px}
.bb-ai{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:8px 0}
.bb-ai .done{color:var(--ok);font-weight:700}
.btn.dim,.btn:disabled.dim{opacity:.45;filter:grayscale(.6)}
.nxa{width:100%;min-height:64px;resize:vertical}
/* Tìm và chia trang Bài đã giao */
.gv-find{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:0 0 10px}
.gv-find input{flex:1;min-width:200px}
/* Kết quả 5 bài gần nhất */
.kq5{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-bottom:14px}
.kq5 .card b{display:block}
.kq5 .nums{display:flex;gap:10px;margin-top:6px;font-size:.9rem}
.kq5 .nums span{display:flex;flex-direction:column}.kq5 .nums strong{font-size:1.2rem}
/* Thi đấu của lớp (giáo viên chỉ xem thống kê) */
.tdk{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin-bottom:14px}
.tdk .card{text-align:center}.tdk .card b{display:block;font-size:1.6rem;color:var(--pri)}
/* Sửa bìa, mục lục dạng bấm */
.eb-cover{display:flex;gap:14px;align-items:flex-start;flex-wrap:wrap;margin-top:6px}
.eb-prev{width:96px;height:132px;border:1px dashed var(--line);border-radius:8px;display:grid;place-items:center;overflow:hidden;background:var(--surface2);color:var(--mute);font-size:.8rem;text-align:center}
.eb-prev img{width:100%;height:100%;object-fit:cover}
.toc-ed{display:flex;flex-direction:column;gap:10px;margin-top:8px}
.toc-ch{border:1px solid var(--line);border-radius:var(--r-s);padding:10px;background:var(--surface)}
.toc-chh{display:flex;gap:8px;align-items:center;margin-bottom:8px}
.toc-no{font-weight:800;color:var(--pri);white-space:nowrap;font-size:.85rem}
.toc-cn{flex:1;font-weight:700}
.toc-hd,.toc-row{display:grid;grid-template-columns:64px minmax(140px,1fr) 64px minmax(200px,1.2fr) auto;gap:6px;align-items:start}
.toc-hd{font-size:.75rem;color:var(--mute);font-weight:700;padding:0 2px}
.toc-row{padding:6px 0;border-top:1px dashed var(--line)}
.toc-ts{display:flex;flex-wrap:wrap;gap:4px;align-items:center}
.toc-ts .chip{display:inline-flex;align-items:center;gap:4px;font-size:.8rem}
.toc-ts .chip button{border:0;background:none;cursor:pointer;color:var(--mute);padding:0 2px;font-size:.8rem}
.toc-add{display:inline-flex;gap:4px;align-items:center}
.toc-add select{width:auto;padding:4px 6px;font-size:.8rem}.toc-add input{width:58px;padding:4px 6px}
.toc-act{display:flex;gap:2px}
@media (max-width:700px){.toc-hd{display:none}.toc-row{grid-template-columns:56px 1fr 56px}.toc-ts{grid-column:1/-1}.toc-act{grid-column:1/-1;justify-content:flex-end}}
.tarr{min-height:30px;padding:2px 9px;font-weight:800}
.ugrp>.unm:last-child{border-radius:999px}
.umenu .umout{border-top:1px solid var(--line);margin-top:4px}
.umenu .umh #umPts:empty{display:none}
.aem summary{cursor:pointer;color:var(--mute);font-size:.9rem;margin-top:10px}
.lich-fab{position:fixed;right:96px;bottom:18px;z-index:60;box-shadow:var(--sh2, 0 6px 18px rgba(0,0,0,.18))}
@media (max-width:760px){.lich-fab{right:12px;bottom:84px}}