:root{
  --nen:#f6f7f8; --the:#ffffff; --vien:#e3e6ea; --chu:#16202a; --chu-mo:#6b7684;
  --chinh:#0f766e; --chinh-nhat:#14b8a6; --nhan:#f59e0b; --do:#dc2626;
  --xanh:#16a34a; --tim:#7c3aed; --bong:0 1px 2px rgba(16,24,40,.06),0 8px 24px rgba(16,24,40,.06);
  --bo-goc:14px; --cao:46px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--nen); color:var(--chu);
  font-family:"Segoe UI",system-ui,-apple-system,"Noto Sans",Roboto,Arial,sans-serif;
  font-size:15px; line-height:1.5; padding-bottom:74px;
}
button,input,select,textarea{font:inherit;color:inherit}
.an{display:none !important}
.phu{display:block;color:var(--chu-mo);font-size:12.5px}

/* ─── đăng nhập ─── */
.man-dang-nhap{position:fixed;inset:0;background:linear-gradient(160deg,#0f766e,#0b3b46);
  display:flex;align-items:center;justify-content:center;z-index:60;padding:20px}
.hop-dang-nhap{background:var(--the);border-radius:18px;padding:30px 26px;width:100%;max-width:360px;
  box-shadow:0 30px 60px rgba(0,0,0,.3);text-align:center}
.logo-lon{font-size:40px;color:var(--chinh)}
.hop-dang-nhap h1{margin:6px 0 2px;font-size:22px}
.hop-dang-nhap input{width:100%;height:var(--cao);border:1px solid var(--vien);border-radius:10px;
  padding:0 12px;margin:14px 0 10px}
.hop-dang-nhap .nut{width:100%}
.loi{color:var(--do);font-size:13px;min-height:18px;margin:8px 0 0}

/* ─── đầu trang ─── */
.dau-trang{position:sticky;top:0;z-index:20;background:var(--the);border-bottom:1px solid var(--vien);
  padding:10px 16px 12px}
.hang-tren{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.thuong-hieu{display:flex;align-items:center;gap:10px}
.logo{width:38px;height:38px;border-radius:11px;background:linear-gradient(150deg,var(--chinh),var(--chinh-nhat));
  color:#fff;display:grid;place-items:center;font-size:21px}
.thuong-hieu strong{font-size:17px;display:block}
.hanh-dong{display:flex;gap:8px;flex-wrap:wrap}
.nut{height:var(--cao);padding:0 14px;border:1px solid var(--vien);background:var(--the);
  border-radius:11px;cursor:pointer;display:inline-flex;align-items:center;gap:6px;white-space:nowrap}
.nut:hover{border-color:#c8ced6;background:#fbfbfc}
.nut.chinh{background:var(--chinh);border-color:var(--chinh);color:#fff;font-weight:600}
.nut.chinh:hover{background:#0d6a62}
.nut.nguy{color:var(--do);border-color:#f3c9c9}
.nut.nho{height:34px;padding:0 10px;font-size:13px;border-radius:9px}
.hang-duoi{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.o-tim{flex:1 1 260px}
.o-tim input{width:100%;height:var(--cao);border:1px solid var(--vien);border-radius:11px;padding:0 14px;background:#fbfbfc}
.o-tim input:focus{outline:2px solid #b9e3df;background:#fff}
.chon{height:var(--cao);border:1px solid var(--vien);border-radius:11px;padding:0 10px;background:var(--the);cursor:pointer}
.loc{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px;align-items:center}
.nhom-loc{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.nhom-loc b{font-size:12px;color:var(--chu-mo);font-weight:600;text-transform:uppercase;letter-spacing:.03em}
.the-loc{height:32px;padding:0 11px;border-radius:999px;border:1px solid var(--vien);background:#fbfbfc;
  cursor:pointer;font-size:13px;display:inline-flex;align-items:center;gap:5px}
.the-loc:hover{border-color:#c8ced6}
.the-loc.dang-chon{background:var(--chinh);border-color:var(--chinh);color:#fff;font-weight:600}
.the-loc .so{opacity:.65;font-size:12px}

/* ─── nội dung ─── */
main{padding:16px;max-width:1400px;margin:0 auto}
.luoi{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.the-bai{background:var(--the);border:1px solid var(--vien);border-radius:var(--bo-goc);padding:14px;
  cursor:pointer;box-shadow:var(--bong);display:flex;flex-direction:column;gap:8px;transition:.12s}
.the-bai:hover{transform:translateY(-1px);border-color:#cfd6dd}
.tb-dau{display:flex;justify-content:space-between;gap:8px;align-items:flex-start}
.tb-ten{font-weight:650;font-size:15.5px;line-height:1.35}
.tb-ma{font-size:11.5px;color:var(--chu-mo);font-variant-numeric:tabular-nums}
.tb-ca-si{font-size:13px;color:var(--chu-mo)}
.tb-nhan{display:flex;gap:5px;flex-wrap:wrap}
.nhan{font-size:11.5px;padding:2px 8px;border-radius:999px;background:#eef2f5;color:#475569;white-space:nowrap}
.nhan.the-loai{background:#e6f4f2;color:#0f5f59}
.nhan.td-chua{background:#eef2f5;color:#475569}
.nhan.td-dang{background:#fff4e0;color:#a35b00}
.nhan.td-san-sang{background:#e8f0fe;color:#1d4ed8}
.nhan.td-da-thu{background:#e6f7ec;color:#137a3d}
.nhan.dg-rat{background:#e6f7ec;color:#137a3d}
.nhan.dg-hop{background:#e8f0fe;color:#1d4ed8}
.nhan.dg-can{background:#fdeaea;color:#b91c1c}
.nhan.uu-cao{background:#fdeaea;color:#b91c1c}
.nhan.uu-vua{background:#fff4e0;color:#a35b00}
.nhan.uu-thap{background:#eef2f5;color:#475569}
.tb-duoi{display:flex;justify-content:space-between;font-size:12px;color:var(--chu-mo);align-items:center}
.trich{font-size:12.5px;color:var(--chu-mo);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
  overflow:hidden;white-space:pre-wrap}
.trong{background:var(--the);border:1px dashed var(--vien);border-radius:var(--bo-goc);padding:40px;text-align:center;color:var(--chu-mo)}

/* ─── hộp thoại ─── */
.hop-tho{position:fixed;inset:0;background:rgba(15,23,32,.5);z-index:40;
  display:flex;align-items:flex-start;justify-content:center;padding:20px;overflow:auto}
.hop{background:var(--the);border-radius:18px;width:100%;max-width:820px;box-shadow:0 30px 60px rgba(0,0,0,.28);
  margin:auto;overflow:hidden}
.hop.rut-gon{max-width:520px}
.hop-dau{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:16px 18px;
  border-bottom:1px solid var(--vien);position:sticky;top:0;background:var(--the);z-index:2}
.hop-dau h2{margin:0;font-size:17px}
.hop-than{padding:18px;display:flex;flex-direction:column;gap:14px}
.hop-chan{display:flex;justify-content:flex-end;gap:8px;padding:14px 18px;border-top:1px solid var(--vien);
  background:#fbfbfc;position:sticky;bottom:0}
.o{display:flex;flex-direction:column;gap:5px}
.o label{font-size:12.5px;font-weight:600;color:var(--chu-mo)}
.o input,.o select,.o textarea{height:var(--cao);border:1px solid var(--vien);border-radius:10px;padding:0 12px;background:#fbfbfc}
.o textarea{height:auto;min-height:170px;padding:11px 12px;resize:vertical;font-family:ui-monospace,Consolas,monospace;
  font-size:13.5px;line-height:1.55;background:#fff}
.o input:focus,.o textarea:focus,.o select:focus{outline:2px solid #b9e3df;background:#fff}
.hang-o{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px}
.ghi-chu-nho{font-size:12px;color:var(--chu-mo)}
.chuyen{display:flex;gap:8px;border-bottom:1px solid var(--vien);padding:0 18px;background:var(--the);position:sticky;top:57px;z-index:1}
.chuyen button{background:none;border:0;padding:11px 4px;border-bottom:2px solid transparent;cursor:pointer;
  color:var(--chu-mo);font-weight:600;font-size:13.5px}
.chuyen button.dang-chon{color:var(--chinh);border-bottom-color:var(--chinh)}

/* ─── chi tiết ─── */
.khoi{border:1px solid var(--vien);border-radius:12px;padding:14px;background:#fbfbfc}
.khoi h3{margin:0 0 8px;font-size:13px;text-transform:uppercase;letter-spacing:.04em;color:var(--chu-mo)}
.loi-hat{white-space:pre-wrap;font-family:ui-monospace,Consolas,monospace;font-size:13.5px;line-height:1.7;
  background:#fff;border:1px solid var(--vien);border-radius:10px;padding:14px;max-height:none}
.ban-thu{display:flex;flex-direction:column;gap:8px;border:1px solid var(--vien);border-radius:11px;
  padding:11px 12px;background:#fff}
.bt-dau{display:flex;justify-content:space-between;gap:10px;align-items:center;flex-wrap:wrap}
.bt-ten{font-weight:600}
.bt-link{font-size:12.5px;word-break:break-all}
.bt-link a{color:var(--chinh)}
audio{width:100%;height:38px}
.bang{width:100%;border-collapse:collapse;font-size:13.5px}
.bang th,.bang td{border-bottom:1px solid var(--vien);padding:8px 10px;text-align:left}
.bang th{color:var(--chu-mo);font-size:12px;text-transform:uppercase;letter-spacing:.03em}
.thanh{margin-top:9px;display:flex;gap:6px;align-items:center;font-size:12.5px;color:var(--chu-mo)}
.thanh-nen{flex:1;height:8px;background:#eef2f5;border-radius:999px;overflow:hidden}
.thanh-chay{height:100%;background:var(--chinh)}

/* ─── thanh dưới ─── */
.thanh-duoi{position:fixed;bottom:0;left:0;right:0;background:var(--the);border-top:1px solid var(--vien);
  display:none;z-index:30;padding-bottom:env(safe-area-inset-bottom)}
.thanh-duoi button{flex:1;background:none;border:0;padding:9px 2px 8px;font-size:11.5px;color:var(--chu-mo);cursor:pointer}
.thanh-duoi button.dang-chon{color:var(--chinh);font-weight:700}
.thong-bao{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);background:#16202a;color:#fff;
  padding:11px 18px;border-radius:11px;z-index:70;box-shadow:0 10px 30px rgba(0,0,0,.3);font-size:14px}

@media (max-width:760px){
  .thanh-duoi{display:flex}
  main{padding:12px}
  .dau-trang{padding:9px 12px 10px}
  .hanh-dong .nut{padding:0 10px;font-size:13.5px}
  #nut-thong-ke{display:none}
  .luoi{grid-template-columns:1fr}
  .hop-tho{padding:0;align-items:flex-end}
  .hop{border-radius:18px 18px 0 0;max-height:94vh;overflow:auto}
  .chuyen{top:0}
}