:root{--red:#C7090E;--red-dark:#700607;--gold:#F5C04A;--cream:#FFF8EE;--ink:#1f1a17;--muted:#6b625c;--line:#e8dccb;--ok:#1b7f3a}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.55 "Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--cream)}
a{color:var(--red)}
.top{display:flex;align-items:center;gap:12px;padding:10px 16px;background:linear-gradient(90deg,var(--red),var(--red-dark));color:#fff}
.top img{background:#fff;border-radius:50%;padding:3px;height:44px;width:44px;object-fit:contain}
.top .slogan{color:var(--gold);font-weight:600}
.top nav{margin-left:auto;display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.top nav a,.top nav .link{color:#fff;font-size:15px}
body.embed .top,body.embed .foot .hide-embed{display:none}
.card{max-width:760px;margin:16px auto;padding:20px 16px;background:#fff;border:1px solid var(--line);border-radius:14px}
.card.narrow{max-width:420px}
main.wide{max-width:1100px;margin:16px auto;padding:0 16px}
h1{font-size:1.5rem;line-height:1.25;margin:.2em 0 .5em;color:var(--red)}
h2{font-size:1.2rem;margin:1em 0 .4em}
label{display:block;margin:12px 0 4px;font-weight:600}
input[type=text],input[type=tel],input[type=number],input[type=email],input[type=password],select,textarea{width:100%;min-height:44px;padding:10px 12px;font:inherit;border:1px solid #cdbfab;border-radius:10px;background:#fff}
textarea{min-height:140px}
.mono{font-family:ui-monospace,Consolas,monospace;font-size:14px}
.check{display:flex;gap:10px;align-items:flex-start;font-weight:400;margin:10px 0}
.check input{width:22px;height:22px;margin-top:3px;flex:none}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 20px;font:inherit;font-weight:700;color:#fff;background:var(--red);border:0;border-radius:10px;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--red-dark)}
.btn:disabled{background:#bbb;cursor:not-allowed}
.btn.alt{background:#fff;color:var(--red);border:2px solid var(--red)}
.btn.gold{background:var(--gold);color:#3a2a00}
.btn.danger{background:#8b0000}
.btn.small{min-height:36px;padding:6px 12px}
.row{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.row.between{justify-content:space-between}
button.link{background:none;border:0;color:inherit;cursor:pointer;font:inherit;text-decoration:underline;padding:0}
.hint,.note{color:var(--muted);font-size:1rem}
.err{color:#b00020;font-weight:600}
.warn{color:#9a5b00}
.ok{color:var(--ok);font-weight:600}
.timerbar{position:sticky;top:0;z-index:5;background:#fff;border-bottom:3px solid var(--red);padding:8px 16px;max-width:760px;margin:0 auto}
.tb-row{display:flex;justify-content:space-between;align-items:center}
.tb-time{font-variant-numeric:tabular-nums;font-size:1.4rem;font-weight:800;color:var(--red)}
.tb-time.low{animation:blink 1s infinite}
@keyframes blink{50%{opacity:.35}}
.progress{height:6px;background:var(--line);border-radius:3px;margin-top:6px;overflow:hidden}
.progress>div{height:100%;background:var(--red);width:0}
.q{border-top:1px solid var(--line);padding:14px 0}
.q:first-of-type{border-top:0}
.q .stem{font-weight:600;margin-bottom:8px}
.opt{display:flex;gap:10px;align-items:flex-start;min-height:44px;padding:8px 12px;margin:6px 0;border:1px solid var(--line);border-radius:10px;cursor:pointer;font-weight:400}
.opt input{width:22px;height:22px;flex:none;margin-top:2px}
.opt.sel{border-color:var(--red);background:#fff1f1}
.passage{background:var(--cream);border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:10px 0;white-space:pre-wrap}
.dots{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.dot{min-width:44px;min-height:44px;border-radius:50%;border:1px solid var(--line);background:#fff;font:inherit;cursor:pointer}
.dot.done{background:#fde7e7;border-color:var(--red)}
.dot.cur{background:var(--red);color:#fff}
.big-band{font-size:3rem;font-weight:800;color:var(--red);line-height:1}
.badge{display:inline-block;background:var(--gold);color:#3a2a00;border-radius:999px;padding:2px 12px;font-weight:700}
.bars{width:100%;max-width:520px}
.status{font-size:1rem;margin:4px 0}
.tbl{border-collapse:collapse;width:100%;font-size:1rem}
.tbl th,.tbl td{border:1px solid var(--line);padding:6px 8px;text-align:left;vertical-align:top}
.tbl th{background:#fbefe0}
.tbl tr.dead td{background:#fdecea}
.scroll-x{overflow-x:auto}
.foot{max-width:760px;margin:0 auto 24px;padding:0 16px;color:var(--muted);font-size:1rem;text-align:center}
.banner-red{background:#b00020;color:#fff;padding:10px 16px;font-weight:700}
.banner-red a{color:#fff}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.filters input,.filters select{width:auto}
.inline{display:inline}
pre.plain{white-space:pre-wrap;background:var(--cream);padding:10px;border-radius:8px}
.rec-btn{background:#b00020}
.rec-dot{display:inline-block;width:12px;height:12px;border-radius:50%;background:#b00020;margin-right:6px;animation:blink 1s infinite}
@media (min-width:700px){.card{padding:28px 32px}}

/* Đợt 11: chọn AI / giáo viên chấm */
.grading{margin-top:24px}
.gcard{border:1px solid #e8dccb;border-radius:12px;padding:14px;margin:12px 0;background:#fff}
.gcard h3{margin:0 0 8px}
.ai-label{color:#C7090E;font-weight:700;font-size:16px}
.tag-low{color:#6b625c;font-style:italic}
.crit{padding-left:20px;margin:8px 0}

.cell-red td{background:#fde2e2}.cell-yellow td{background:#fff3cd}
.pw-wrap{display:flex;gap:6px;align-items:stretch}.pw-wrap input{flex:1;min-width:0}.pw-toggle{padding:0 14px;min-height:44px;border:1px solid #cdbfab;border-radius:10px;background:#faf6f0;cursor:pointer;font:inherit;font-weight:600}