/* Giao diện đồng bộ với bộ slide tập huấn: nền navy, nhấn vàng */
*{margin:0;padding:0;box-sizing:border-box}
:root{--navy:#0b3d91;--navy2:#06214f;--blue:#1a73e8;--gold:#ffc93c;--ink:#f6faff;
  --muted:#a9c2e6;--line:rgba(140,190,255,.3);--card:rgba(10,40,95,.55);--ok:#34d399;--pink:#f43f8e}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  background:linear-gradient(160deg,#051b45 0%,#0a2f6d 55%,#0b3d91 100%);min-height:100vh;color:var(--ink)}
a{color:#8ec2ff;text-decoration:none}
.wrap{max-width:1100px;margin:0 auto;padding:18px 16px 60px}
header.top{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:10px 0 16px;border-bottom:1px solid var(--line);margin-bottom:18px}
header.top .brand{font-weight:800;font-size:19px}
header.top .brand small{display:block;font-weight:400;font-size:12.5px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase}
header.top nav{margin-left:auto;display:flex;gap:8px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:7px;background:var(--blue);color:#fff;border:0;border-radius:11px;
  padding:9px 16px;font-size:14.5px;font-weight:600;cursor:pointer;font-family:inherit}
.btn:hover{filter:brightness(1.12)}
.btn.ghost{background:rgba(26,115,232,.18);border:1px solid var(--line);color:#dbeafe}
.btn.gold{background:var(--gold);color:#38300b}
.btn.danger{background:#b91c1c}
h1{font-size:26px;margin-bottom:6px}
h2{font-size:20px;margin:18px 0 10px}
.sub{color:var(--muted);font-size:14.5px;margin-bottom:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px}
.grid{display:grid;gap:14px}
@media(min-width:760px){.g2{grid-template-columns:1fr 1fr}.g3{grid-template-columns:repeat(3,1fr)}}
label{display:block;font-size:13.5px;color:var(--muted);margin:12px 0 5px}
input[type=text],input[type=password],select,textarea{width:100%;background:#04122e;border:1px solid var(--line);
  border-radius:10px;color:var(--ink);padding:11px 13px;font-size:15.5px;font-family:inherit}
textarea{min-height:130px;resize:vertical}
.err{background:rgba(244,63,142,.15);border:1px solid rgba(244,63,142,.5);border-radius:10px;padding:10px 14px;margin-bottom:12px;font-size:14.5px}
.okmsg{background:rgba(52,211,153,.14);border:1px solid rgba(52,211,153,.5);border-radius:10px;padding:10px 14px;margin-bottom:12px;font-size:14.5px}
.badge{display:inline-block;font-size:12px;padding:3px 10px;border-radius:999px;background:rgba(255,201,60,.15);
  color:var(--gold);border:1px solid rgba(255,201,60,.4)}
.chip{display:inline-flex;align-items:center;gap:5px;font-size:12.5px;padding:4px 10px;border-radius:999px;
  background:rgba(26,115,232,.2);border:1px solid var(--line);color:#cfe0fb}
.chip.on{background:rgba(52,211,153,.16);border-color:rgba(52,211,153,.5);color:#a7f3d0}
.chip.off{opacity:.45}
/* thẻ bài trong trang chung */
.cards{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(255px,1fr))}
.bai{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;display:flex;flex-direction:column;gap:8px;transition:transform .12s}
.bai:hover{transform:translateY(-2px);border-color:rgba(140,190,255,.55)}
.bai .t{font-weight:700;font-size:16.5px;line-height:1.3;color:#fff}
.bai .m{font-size:13px;color:var(--muted)}
.bai .parts{display:flex;gap:6px;flex-wrap:wrap}
.heart{display:inline-flex;align-items:center;gap:6px;background:rgba(244,63,142,.15);border:1px solid rgba(244,63,142,.45);
  color:#ffd3e6;border-radius:999px;padding:6px 14px;font-size:14px;font-weight:700;cursor:pointer;font-family:inherit}
.heart.mine{background:var(--pink);color:#fff}
.heart:disabled{opacity:.5;cursor:default}
/* upload */
.upl{border:2px dashed var(--line);border-radius:14px;padding:14px;margin-top:6px}
.upl .row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
progress{width:100%;height:8px;margin-top:8px;display:none}
.small{font-size:12.5px;color:var(--muted)}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid rgba(140,190,255,.16)}
th{font-size:11.5px;letter-spacing:.09em;text-transform:uppercase;color:var(--muted)}
tr:hover td{background:rgba(26,115,232,.08)}
/* điểm danh */
.dd-ph{margin-bottom:22px}
.dd-ph>h2{display:flex;align-items:center;gap:10px}
.dd-ph .cnt{font-size:14px;color:var(--gold);font-weight:700}
.dd-to{margin:8px 0 4px;font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.dd-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px}
.gvchip{display:inline-flex;align-items:center;gap:6px;background:rgba(26,115,232,.2);border:1px solid var(--line);
  border-radius:999px;padding:6px 14px;font-size:14.5px}
.gvchip.done{background:rgba(52,211,153,.18);border-color:rgba(52,211,153,.55)}
.bigstat{display:flex;gap:14px;flex-wrap:wrap;margin:14px 0}
.bigstat .bs{flex:1;min-width:140px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;text-align:center}
.bigstat .bs b{display:block;font-size:34px;color:var(--gold)}
.bigstat .bs span{font-size:13px;color:var(--muted)}
/* vinh danh */
.rank{display:flex;flex-direction:column;gap:10px;margin-top:14px}
.rk{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 18px}
.rk .pos{width:44px;height:44px;border-radius:50%;background:var(--blue);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:19px;flex:0 0 auto}
.rk:nth-child(1) .pos{background:var(--gold);color:#3a2f05}
.rk:nth-child(2) .pos{background:#cbd5e1;color:#1e293b}
.rk:nth-child(3) .pos{background:#d97706}
.rk .nm{font-weight:700;font-size:18px}
.rk .meta{font-size:13px;color:var(--muted)}
.rk .hh{margin-left:auto;font-size:20px;font-weight:800;color:#ffd3e6;white-space:nowrap}
video,audio{width:100%;border-radius:12px;background:#000;outline:none}
.footer-note{margin-top:30px;text-align:center;font-size:12.5px;color:rgba(169,194,230,.55)}