/* Giao dien he thong thi truc tuyen - mobile first */
:root{
  --xanh:#12603f; --xanh-nhat:#e8f3ee; --vang:#b8860b;
  --do:#b3261e; --do-nhat:#fdecea; --cam:#c66a00; --cam-nhat:#fff4e5;
  --luc:#1b7a3e; --luc-nhat:#e9f6ee;
  --nen:#f4f5f7; --the:#fff; --vien:#dfe3e8; --chu:#1f2328; --chu-mo:#5b6470;
  --r:8px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  font-size:15px;line-height:1.55;color:var(--chu);background:var(--nen)}
a{color:var(--xanh);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{margin:0 0 12px;line-height:1.3}
h1{font-size:22px}h2{font-size:18px}h3{font-size:16px}
img{max-width:100%;height:auto}

/* ---- Thanh tren ---- */
.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:10px;
  background:var(--xanh);color:#fff;padding:10px 14px;flex-wrap:wrap}
.topbar a{color:#fff}
.brand{font-weight:700;font-size:16px}
.spacer{flex:1}
.who{font-size:13px;opacity:.9;display:none}
.menu-toggle{background:transparent;border:1px solid rgba(255,255,255,.4);color:#fff;
  border-radius:6px;font-size:18px;padding:2px 10px;cursor:pointer}

/* ---- Bo cuc ---- */
.wrap{display:block}
.sidebar{display:none;background:var(--the);border-bottom:1px solid var(--vien);padding:8px}
body.nav-open .sidebar{display:block}
.sidebar a{display:block;padding:10px 12px;border-radius:var(--r);color:var(--chu)}
.sidebar a.active{background:var(--xanh-nhat);color:var(--xanh);font-weight:600}
.content{padding:14px}
.page-title{font-size:20px;margin:4px 0 14px}

@media(min-width:900px){
  .menu-toggle{display:none}
  .who{display:inline}
  .wrap{display:flex;min-height:calc(100vh - 48px)}
  .sidebar{display:block;width:210px;flex:0 0 210px;border-right:1px solid var(--vien);border-bottom:none;padding:12px 8px}
  .content{flex:1;padding:20px 24px;max-width:1400px}
}

/* ---- The, bang, form ---- */
.card{background:var(--the);border:1px solid var(--vien);border-radius:var(--r);padding:14px;margin-bottom:14px}
.card h2{font-size:16px}
.grid{display:grid;gap:12px}
@media(min-width:700px){.grid-2{grid-template-columns:1fr 1fr}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}}
.stat{background:var(--the);border:1px solid var(--vien);border-radius:var(--r);padding:14px}
.stat .num{font-size:26px;font-weight:700;color:var(--xanh)}
.stat .lbl{font-size:13px;color:var(--chu-mo)}

.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
table{width:100%;border-collapse:collapse;background:var(--the);font-size:14px}
th,td{padding:8px 10px;border-bottom:1px solid var(--vien);text-align:left;vertical-align:top}
th{background:#f0f2f4;font-weight:600;white-space:nowrap}
tr:hover td{background:#fafbfc}
td.num,th.num{text-align:right;white-space:nowrap}

label{display:block;font-size:13px;font-weight:600;margin:10px 0 4px}
input[type=text],input[type=password],input[type=number],input[type=date],input[type=datetime-local],
input[type=email],select,textarea{
  width:100%;padding:9px 10px;border:1px solid var(--vien);border-radius:6px;font:inherit;background:#fff}
textarea{min-height:90px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:2px solid var(--xanh-nhat);border-color:var(--xanh)}
.inline{display:flex;gap:8px;flex-wrap:wrap;align-items:flex-end}
.inline>*{flex:1;min-width:140px}
.check{display:flex;align-items:center;gap:8px;margin:6px 0;font-weight:400;font-size:14px}
.check input{width:auto;margin:0}
.hint{font-size:12.5px;color:var(--chu-mo);margin-top:3px}

.btn{display:inline-block;padding:9px 14px;border-radius:6px;border:1px solid var(--xanh);
  background:var(--xanh);color:#fff;font:inherit;font-weight:600;cursor:pointer;text-align:center}
.btn:hover{opacity:.92;text-decoration:none;color:#fff}
.btn-sm{padding:5px 10px;font-size:13px}
.btn-ghost{background:transparent;color:var(--xanh);border-color:var(--xanh)}
.topbar .btn-ghost{color:#fff;border-color:rgba(255,255,255,.5)}
.btn-do{background:var(--do);border-color:var(--do)}
.btn-xam{background:#6b7280;border-color:#6b7280}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px;align-items:center}

.alert{padding:10px 12px;border-radius:var(--r);margin-bottom:12px;font-size:14px;border:1px solid}
.alert-ok{background:var(--luc-nhat);border-color:#bfe0cb;color:#14532d}
.alert-loi{background:var(--do-nhat);border-color:#f3c2bd;color:#7f1d1d}
.alert-canhbao{background:var(--cam-nhat);border-color:#f5d9ac;color:#7c3a00}

.tag{display:inline-block;padding:1px 8px;border-radius:20px;font-size:12px;font-weight:600;white-space:nowrap}
.tag-luc{background:var(--luc-nhat);color:#14532d}
.tag-cam{background:var(--cam-nhat);color:#7c3a00}
.tag-do{background:var(--do-nhat);color:#7f1d1d}
.tag-xam{background:#eceff2;color:#41474f}
.tag-xanh{background:var(--xanh-nhat);color:var(--xanh)}

/* ---- Dang nhap ---- */
body.auth{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:16px;background:var(--xanh)}
.auth-box{background:#fff;border-radius:12px;padding:24px;width:100%;max-width:380px;box-shadow:0 8px 30px rgba(0,0,0,.2)}
.auth-box h1{font-size:19px;text-align:center;color:var(--xanh)}
.auth-box .sub{text-align:center;color:var(--chu-mo);font-size:13px;margin-bottom:14px}

/* ---- Giao dien thi sinh ---- */
body.thi{background:#fff}
.thi-header{position:sticky;top:0;z-index:40;background:var(--xanh);color:#fff;
  display:flex;align-items:center;gap:10px;padding:8px 12px}
.thi-header .ten{font-size:14px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dongho{font-variant-numeric:tabular-nums;font-weight:700;font-size:18px;background:rgba(255,255,255,.15);
  padding:3px 10px;border-radius:6px}
.dongho.sap-het{background:var(--do);animation:nhap 1s infinite}
@keyframes nhap{50%{opacity:.55}}
.trangthai-luu{font-size:12px;padding:4px 12px;background:#f0f2f4;color:var(--chu-mo);
  border-bottom:1px solid var(--vien);position:sticky;top:44px;z-index:39}
.trangthai-luu.loi{background:var(--do-nhat);color:#7f1d1d;font-weight:600}

.cau-hoi{background:#fff;border:1px solid var(--vien);border-radius:var(--r);padding:14px;margin:12px 0}
.cau-hoi .so{font-weight:700;color:var(--xanh);margin-bottom:6px}
.cau-hoi .nd{margin-bottom:10px}
.cau-hoi .nd p{margin:0 0 8px}
.lua-chon{display:block;border:1px solid var(--vien);border-radius:var(--r);padding:10px 12px;margin-bottom:8px;
  cursor:pointer;background:#fff;font-weight:400}
.lua-chon:hover{border-color:var(--xanh)}
.lua-chon.chon{background:var(--xanh-nhat);border-color:var(--xanh);font-weight:600}
.lua-chon input{margin-right:8px;width:auto}
.ds-table{width:100%;font-size:14px}
.ds-table td{padding:6px}
.ds-table .y{width:auto}
.ds-opt{display:inline-flex;gap:4px;align-items:center;margin-right:10px;font-weight:400}

.luoi-cau{display:grid;grid-template-columns:repeat(auto-fill,minmax(42px,1fr));gap:6px}
.luoi-cau a{display:block;text-align:center;padding:8px 0;border:1px solid var(--vien);border-radius:6px;
  background:#fff;color:var(--chu);font-size:13px;font-weight:600}
.luoi-cau a.xong{background:var(--luc-nhat);border-color:#8ec5a3;color:#14532d}
.luoi-cau a.danhdau{background:var(--cam-nhat);border-color:#e5b062;color:#7c3a00}
.luoi-cau a.hien-tai{outline:2px solid var(--xanh)}

.thanh-duoi{position:sticky;bottom:0;background:#fff;border-top:1px solid var(--vien);
  padding:10px 12px;display:flex;gap:8px;align-items:center}
.thanh-duoi .btn{flex:1}

.watermark{position:fixed;inset:0;pointer-events:none;z-index:1;opacity:.07;
  font-size:15px;font-weight:700;color:#000;overflow:hidden}
.watermark span{position:absolute;transform:rotate(-30deg);white-space:nowrap}
.che-man{position:fixed;inset:0;background:rgba(18,96,63,.97);color:#fff;z-index:999;
  display:none;align-items:center;justify-content:center;text-align:center;padding:24px}
.che-man.hien{display:flex}
.che-man h2{color:#fff}

/* ---- Diem danh ---- */
.checkin-box{max-width:520px;margin:0 auto}
#video,#anh-xem{width:100%;max-width:420px;border-radius:var(--r);background:#000;display:block;margin:0 auto 10px}
.luoi-anh{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px}
.o-anh{border:1px solid var(--vien);border-radius:var(--r);padding:8px;background:#fff;text-align:center;font-size:13px}
.o-anh img{border-radius:6px;width:100%;aspect-ratio:4/3;object-fit:cover;background:#eee}
.o-anh.duyet{border-color:#8ec5a3}
.o-anh.cho{border-color:#e5b062}

.ruiro{display:inline-block;min-width:34px;text-align:center;padding:1px 6px;border-radius:6px;font-weight:700;font-size:12px}
.ruiro.r0{background:#eceff2;color:#41474f}
.ruiro.r1{background:var(--luc-nhat);color:#14532d}
.ruiro.r2{background:var(--cam-nhat);color:#7c3a00}
.ruiro.r3{background:var(--do-nhat);color:#7f1d1d}

.pill{font-size:12px;color:var(--chu-mo)}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px}
.center{text-align:center}
.mt{margin-top:14px}
.muted{color:var(--chu-mo)}
.nowrap{white-space:nowrap}
hr{border:0;border-top:1px solid var(--vien);margin:14px 0}
@media print{.topbar,.sidebar,.toolbar,.thanh-duoi{display:none}}