:root{
  --bg:#fbf8f3;--card:#ffffff;--ink:#2b2a28;--muted:#6f6a62;--line:#e8e1d6;--head:#f6f1e9;
  --accent:#e07a5f;
  --plus:#2f8a5f;--plus-bg:#e2f3ea;--minus:#c0392b;--minus-bg:#fbe3e0;--mix:#b07a06;--mix-bg:#fbf0d4;
  --c1:#e07a5f;--c2:#4a7fc1;--c3:#c98a10;--c4:#3d9970;--c5:#8a5cc2;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#1c1b19;--card:#262421;--ink:#efebe4;--muted:#a9a297;--line:#3a3732;--head:#2f2c28;--accent:#f0957c;
    --plus:#6fd3a0;--plus-bg:#1f3a2d;--minus:#f08a7e;--minus-bg:#43231f;--mix:#f0c35a;--mix-bg:#3e331a;
  }
}
:root[data-theme="dark"]{
  --bg:#1c1b19;--card:#262421;--ink:#efebe4;--muted:#a9a297;--line:#3a3732;--head:#2f2c28;--accent:#f0957c;
  --plus:#6fd3a0;--plus-bg:#1f3a2d;--minus:#f08a7e;--minus-bg:#43231f;--mix:#f0c35a;--mix-bg:#3e331a;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:Nunito,system-ui,sans-serif;line-height:1.45;font-size:15px}
.wrap{max-width:1180px;margin:0 auto;padding:24px 16px 64px}
h1{font-size:clamp(22px,4.5vw,32px);margin:0 0 4px;font-weight:800}
.sub{color:var(--muted);margin:0 0 14px}
.btns{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.btn{border:none;background:var(--accent);color:#fff;font:inherit;font-weight:700;padding:8px 16px;border-radius:10px;cursor:pointer}
.btn.ghost{background:var(--card);color:var(--ink);border:1px solid var(--line)}
.legend{display:flex;gap:14px;flex-wrap:wrap;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 14px;margin-bottom:18px;font-size:14px}
.legend .mark{display:inline-grid;place-items:center;min-width:30px;height:26px;border-radius:6px;font-weight:800;margin-right:4px}
.ov-month{font-weight:800;margin:10px 0 6px;color:var(--muted);font-size:13px;text-transform:uppercase;letter-spacing:.05em}
.overview{display:grid;gap:8px;grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.ov{border-radius:12px;padding:10px 14px;color:#fff;text-decoration:none}
.ov b{display:block;font-size:12px;opacity:.9}
.ov span{font-size:16px;font-weight:800}
.month-title{font-size:26px;font-weight:800;margin:44px 0 6px;padding-bottom:6px;border-bottom:3px solid var(--line)}
.month-sub{color:var(--muted);margin:0 0 18px}
.week{margin-bottom:36px}
.week-head{border-radius:14px 14px 0 0;padding:14px 18px;color:#fff}
.week-head h2{margin:0;font-size:21px}
.info{background:var(--card);border:1px solid var(--line);border-top:none;padding:10px 18px;display:grid;gap:4px}
.info div b{display:inline-block;min-width:96px}
.tbl{overflow-x:auto;border:1px solid var(--line);border-top:none;border-radius:0 0 14px 14px;background:var(--card)}
table{width:100%;border-collapse:collapse;min-width:860px}
th,td{border-bottom:1px solid var(--line);border-right:1px solid var(--line);padding:7px 8px;vertical-align:middle;text-align:left}
th:last-child,td:last-child{border-right:none}
th{background:var(--head);font-size:13px;color:var(--muted);font-weight:800}
th.d{text-align:center;width:58px}
td.act{vertical-align:middle;width:20%;background:var(--head)}
td.act .n{font-weight:800}
td.act .h{font-size:13.5px;margin-top:3px}
td.act .q{font-size:13.5px;font-style:italic;color:var(--muted);margin-top:4px}
td.item{width:22%}
td.item .ans{color:var(--muted);font-size:13.5px}
td.c{padding:3px;text-align:center}
.cell{width:100%;height:30px;border:1px dashed var(--line);border-radius:6px;background:transparent;color:var(--ink);font:inherit;font-weight:800;font-size:16px;cursor:pointer}
.cell:hover{border-color:var(--muted)}
.plus{background:var(--plus-bg);color:var(--plus);border-style:solid;border-color:var(--plus)}
.minus{background:var(--minus-bg);color:var(--minus);border-style:solid;border-color:var(--minus)}
.mix{background:var(--mix-bg);color:var(--mix);border-style:solid;border-color:var(--mix)}
@media print{
  .btns,.ov-month,.overview{display:none}
  body{background:#fff;font-size:11.5px}
  .week{break-before:page}
  .month-title{break-before:page;margin-top:0}
  .month-title + .month-sub + .week{break-before:auto}
  .month-title:first-of-type{break-before:auto}
  table{min-width:0}
  tr{break-inside:avoid}
  .cell{border:1px solid #bbb;height:22px}
  @page{size:A4 landscape;margin:10mm}
}

/* ===== Ô đánh dấu: số video ở góc ===== */
.cell{position:relative}
.cell .vc{position:absolute;top:-6px;right:1px;background:var(--accent);color:#fff;font-size:10.5px;font-weight:800;line-height:1;padding:3px 5px;border-radius:99px}
td.item{cursor:pointer}
td.item:hover .iname{text-decoration:underline}
td.item .vrow{font-size:12px;color:var(--accent);font-weight:700}
.role{font-size:14px;color:var(--muted);align-self:center}

/* ===== Bảng trượt lên (bottom sheet) ===== */
.sheet{position:fixed;inset:0;z-index:50;display:flex;align-items:flex-end;justify-content:center}
.sheet[hidden]{display:none}
.sheet-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.45)}
.sheet-panel{position:relative;background:var(--card);color:var(--ink);width:100%;max-width:560px;max-height:88vh;overflow-y:auto;border-radius:18px 18px 0 0;padding:14px 16px 24px;box-shadow:0 -6px 30px rgba(0,0,0,.25)}
@media (min-width:700px){.sheet{align-items:center}.sheet-panel{border-radius:18px}}
.sheet-head{display:flex;gap:10px;align-items:flex-start;justify-content:space-between;margin-bottom:10px}
.sheet-head .t{font-weight:800;font-size:17px}
.sheet-head .s{font-size:13.5px;color:var(--muted)}
.x{border:none;background:var(--head);color:var(--ink);width:34px;height:34px;border-radius:50%;font-size:16px;cursor:pointer;flex:none}
.sec{font-size:13px;font-weight:800;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin:14px 0 6px}
.marks{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.marks button{height:44px;border-radius:10px;border:2px solid var(--line);background:var(--card);color:var(--ink);font:inherit;font-weight:800;font-size:18px;cursor:pointer}
.marks button.plus{background:var(--plus-bg);color:var(--plus);border-color:var(--plus)}
.marks button.minus{background:var(--minus-bg);color:var(--minus);border-color:var(--minus)}
.marks button.mix{background:var(--mix-bg);color:var(--mix);border-color:var(--mix)}
.marks button.clear{font-size:14px}
.player video{width:100%;max-height:50vh;border-radius:12px;background:#000;display:block}
.vlist{display:grid;gap:6px}
.vitem{display:flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:10px;padding:6px 8px}
.vitem.on{border-color:var(--accent)}
.vitem .play{flex:1;border:none;background:none;color:var(--ink);font:inherit;text-align:left;cursor:pointer;padding:4px}
.vitem .del{border:none;background:var(--minus-bg);color:var(--minus);border-radius:8px;padding:6px 10px;font:inherit;font-weight:700;cursor:pointer}
.empty{color:var(--muted);font-size:14px}
.uploads{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}
.uploads label{display:grid;place-items:center;height:46px;border-radius:10px;background:var(--accent);color:#fff;font-weight:800;cursor:pointer}
.uploads label.ghost{background:var(--head);color:var(--ink)}
.uploads input{display:none}
.progress{height:8px;background:var(--head);border-radius:99px;overflow:hidden;margin-top:10px}
.progress div{height:100%;background:var(--plus);width:0;transition:width .2s}
.msg{font-size:14px;margin-top:8px}
.msg.err{color:var(--minus)}
.dayblock{border-top:1px dashed var(--line);padding:8px 0}
.dayblock .dh{display:flex;gap:8px;align-items:center;font-weight:800}
.dayblock .mk{display:inline-grid;place-items:center;min-width:30px;height:24px;border-radius:6px;font-size:14px;border:1px solid var(--line)}

/* ===== Màn hình đăng nhập ===== */
.login{max-width:380px;margin:12vh auto;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px}
.login h1{font-size:22px}
.login input{width:100%;height:44px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;padding:0 12px;margin:10px 0}
.login .btn{width:100%;height:44px}
@media print{.sheet,.role{display:none!important}.cell .vc{display:none}}

/* ===== Ẩn/hiện tuần với cô giáo (chỉ bố mẹ thấy các nút này) ===== */
.week-head{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:center;justify-content:space-between}
.vbtn{border:1px solid var(--line);background:var(--card);color:var(--ink);font:inherit;font-size:13.5px;font-weight:700;padding:6px 12px;border-radius:99px;cursor:pointer}
.vbtn.on-head{border-color:rgba(255,255,255,.6);background:rgba(255,255,255,.18);color:#fff}
.vis-month{display:inline-flex;flex-wrap:wrap;gap:6px;margin-left:12px;vertical-align:middle}
.week.hid .week-head{filter:grayscale(.75) brightness(.85)}
.ov.hid{filter:grayscale(.75) brightness(.85)}
@media print{.vbtn,.vis-month{display:none}}

/* ===== Giao diện cô giáo (quyền chỉ xem): ẩn dòng giới thiệu, chú thích ký hiệu, tiêu đề tháng ===== */
.role-view .legend,.role-view .month-title,.role-view .month-sub,.role-view .ov-month{display:none}
.role-view #overview{display:none}