/* ===================== KHU QUAN TRI (BO ME) ===================== */
:root {
    --nen: #f5f6fa;
    --mat: #ffffff;
    --chu: #22223b;
    --nhat: #6b6f80;
    --vien: #e2e4ec;
    --chinh: #6c4cf1;
    --chinh-dam: #5636d6;
    --xanh: #18a999;
    --do: #e5484d;
    --vang: #fff4cc;
    --bo: 12px;
}

* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.5 'Segoe UI', system-ui, sans-serif; color: var(--chu); background: var(--nen); }
a { color: var(--chinh); text-decoration: none; }
h1 { font-size: 1.6rem; margin: 0 0 4px; }
h2 { font-size: 1.2rem; margin: 0 0 12px; }

/* ---------- Thanh dieu huong ---------- */
.qt-nav {
    display: flex; align-items: center; gap: 4px; flex-wrap: wrap;
    background: #1f1b3a; color: #fff; padding: 8px 16px; position: sticky; top: 0; z-index: 10;
}
.qt-nav .ten { font-weight: 700; margin-right: 16px; font-size: 1.05rem; color: #fff; }
.qt-nav a.muc { color: #cfc8ff; padding: 7px 12px; border-radius: 8px; }
.qt-nav a.muc:hover { background: rgba(255, 255, 255, .08); }
.qt-nav a.muc.chon { background: var(--chinh); color: #fff; }
.qt-nav .phai { margin-left: auto; display: flex; gap: 6px; }

.trang { max-width: 1200px; margin: 0 auto; padding: 20px 16px 60px; }
.dau-trang { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.duong-dan { color: var(--nhat); font-size: .9rem; margin-bottom: 4px; }
.mo { color: var(--nhat); margin: 0; }

/* ---------- Nut ---------- */
.nut {
    display: inline-flex; align-items: center; gap: 6px; justify-content: center;
    border: 1px solid var(--vien); background: var(--mat); color: var(--chu);
    padding: 7px 14px; border-radius: 9px; cursor: pointer; font: inherit; white-space: nowrap;
}
.nut:hover { border-color: #c5c8d6; background: #fafbff; }
.nut:disabled { opacity: .55; cursor: default; }
.nut.chinh { background: var(--chinh); border-color: var(--chinh); color: #fff; }
.nut.chinh:hover { background: var(--chinh-dam); }
.nut.xanh { background: var(--xanh); border-color: var(--xanh); color: #fff; }
.nut.do { color: var(--do); }
.nut.do:hover { background: #fff0f0; border-color: #f3b5b7; }
.nut.nho { padding: 3px 9px; font-size: .88rem; }
.nhom-nut { display: flex; gap: 6px; flex-wrap: wrap; }

/* ---------- The / hop ---------- */
.hop { background: var(--mat); border: 1px solid var(--vien); border-radius: var(--bo); padding: 16px; margin-bottom: 18px; }
.hop-dau { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.hop-dau h2 { margin: 0; }
.hop-dau h2 img { height: 28px; vertical-align: middle; }
.dung-mau img, .mo img { height: 22px; vertical-align: middle; }

.luoi-so { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; margin-bottom: 18px; }
.o-so { background: var(--mat); border: 1px solid var(--vien); border-radius: var(--bo); padding: 14px; }
.o-so b { display: block; font-size: 1.8rem; line-height: 1.1; }
.o-so span { color: var(--nhat); }

.hai-cot { display: grid; grid-template-columns: 320px 1fr; gap: 18px; align-items: start; }
@media (max-width: 860px) { .hai-cot { grid-template-columns: 1fr; } }

/* ---------- Bang ---------- */
.cuon-ngang { overflow-x: auto; }
table.bang { width: 100%; border-collapse: collapse; }
.bang th, .bang td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--vien); vertical-align: middle; }
.bang th { font-size: .82rem; text-transform: uppercase; letter-spacing: .03em; color: var(--nhat); font-weight: 600; background: #fafbfd; }
.bang tr:hover td { background: #fafaff; }
.bang .hinh-nho { width: 44px; height: 44px; display: grid; place-items: center; font-size: 1.8rem; }
.bang .hinh-nho img { max-width: 44px; max-height: 44px; border-radius: 6px; }
.bang td.so { text-align: right; }
.an { opacity: .5; }

/* ---------- Danh sach chu de ---------- */
.ds-chu-de { list-style: none; margin: 0; padding: 0; }
.ds-chu-de li {
    display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 9px; cursor: pointer;
}
.ds-chu-de li:hover { background: #f4f2ff; }
.ds-chu-de li.chon { background: #ebe6ff; }
.ds-chu-de .emoji { font-size: 1.6rem; width: 34px; text-align: center; }
.ds-chu-de img { width: 34px; height: 34px; object-fit: contain; }
.ds-chu-de .ten b { display: block; }
.ds-chu-de .ten small { color: var(--nhat); }

.tab { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 12px; }
.tab button { border: 1px solid var(--vien); background: #fff; padding: 5px 12px; border-radius: 99px; cursor: pointer; font: inherit; }
.tab button.chon { background: var(--chinh); color: #fff; border-color: var(--chinh); }

.nhan { display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: .78rem; background: #eef0f6; color: var(--nhat); }
.nhan.tim { background: #ebe6ff; color: var(--chinh-dam); }
.nhan.xanh { background: #dcf6f2; color: #0d7f73; }
.dung-mau { color: var(--xanh); font-weight: 600; }

/* ---------- Form & modal ---------- */
.nen-modal {
    position: fixed; inset: 0; background: rgba(20, 18, 40, .45); z-index: 50;
    display: flex; align-items: flex-start; justify-content: center; padding: 40px 12px; overflow-y: auto;
}
.modal { background: #fff; border-radius: 14px; width: 100%; max-width: 640px; box-shadow: 0 20px 60px rgba(0, 0, 0, .25); }
.modal.rong { max-width: 860px; }
.modal-dau { display: flex; justify-content: space-between; align-items: center; padding: 14px 18px; border-bottom: 1px solid var(--vien); }
.modal-dau h2 { margin: 0; }
.modal-than { padding: 16px 18px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px 14px; }
.modal-chan { padding: 12px 18px; border-top: 1px solid var(--vien); display: flex; justify-content: flex-end; gap: 8px; align-items: center; }
.modal-chan .loi { margin-right: auto; }
.dong-x { border: 0; background: none; font-size: 1.4rem; cursor: pointer; color: var(--nhat); }

.truong { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.truong.rong { grid-column: 1 / -1; }
.truong > span { font-size: .85rem; font-weight: 600; color: #444; }
.truong small.goi-y { color: var(--nhat); font-size: .8rem; }
.truong .hang { display: flex; gap: 6px; align-items: center; }
.truong .hang > input, .truong .hang > select { flex: 1; min-width: 0; }
@media (max-width: 600px) { .modal-than { grid-template-columns: 1fr; } }

input, select, textarea {
    font: inherit; color: inherit; padding: 7px 10px; border: 1px solid #cfd2de; border-radius: 8px; background: #fff; width: 100%;
}
input[type=checkbox], input[type=radio] { width: auto; }
textarea { min-height: 80px; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid #c9bdff; border-color: var(--chinh); }
.xem-truoc { width: 42px; height: 42px; display: grid; place-items: center; font-size: 1.7rem; border: 1px dashed var(--vien); border-radius: 8px; flex: none; overflow: hidden; }
.xem-truoc img { max-width: 100%; max-height: 100%; }

.lua-chon-qt { display: grid; gap: 6px; }
.lua-chon-qt .dong { display: grid; grid-template-columns: auto 1fr 150px auto; gap: 6px; align-items: center; }
@media (max-width: 600px) { .lua-chon-qt .dong { grid-template-columns: auto 1fr auto; } .lua-chon-qt .dong .o-hinh { display: none; } }

.loi { color: var(--do); font-weight: 600; }
.thong-bao-qt {
    position: fixed; bottom: 20px; right: 20px; z-index: 60; background: #1f1b3a; color: #fff;
    padding: 10px 16px; border-radius: 10px; opacity: 0; transform: translateY(10px); transition: .25s; max-width: 90vw;
}
.thong-bao-qt.hien { opacity: 1; transform: none; }
.thong-bao-qt.loi-tb { background: var(--do); }

.trong-qt { text-align: center; color: var(--nhat); padding: 30px 10px; }
.goi-y-hop { background: var(--vang); border-radius: 10px; padding: 10px 14px; margin-bottom: 14px; font-size: .92rem; }
code { background: #f0f1f6; padding: 1px 5px; border-radius: 5px; }

/* ---------- Dang nhap ---------- */
.trang-dang-nhap { min-height: 100vh; display: grid; place-items: center; background: linear-gradient(135deg, #ece6ff, #ffe8f1); padding: 16px; }
.hop-dang-nhap { background: #fff; padding: 30px 28px; border-radius: 18px; width: 100%; max-width: 380px; box-shadow: 0 20px 50px rgba(60, 40, 120, .15); display: grid; gap: 12px; }
.hop-dang-nhap .logo-lon { font-size: 3.4rem; text-align: center; }
.hop-dang-nhap h1 { text-align: center; }
.hop-dang-nhap .mo { text-align: center; }
.hop-dang-nhap label { display: grid; gap: 4px; font-weight: 600; font-size: .9rem; }
.hop-dang-nhap .hang-check { display: flex; align-items: center; gap: 8px; font-weight: 400; }
.hop-dang-nhap .nut { padding: 10px; font-size: 1rem; }
.lien-ket { text-align: center; font-size: .9rem; }