/* Phòng thi ảo — chế độ tập trung, không dùng header/footer của site. */
.mvn-pt-body{--b:#3D4AEF;--b2:#2830BE;--g:linear-gradient(90deg,#3B44EF,#57B6F7 158.93%);--navy:#0F1730;--gray:#5E7595;--line:#EAEDF4;--soft:#F2F7FF;--tint:#EBF1FF;--ok:#18A34A;--okbg:#ECFDF5;--bad:#E5484D;--badbg:#FFF1F1;--amber:#FE9A00;
  margin:0;min-height:100vh;background:linear-gradient(180deg,#EAF5FF,#F8FAFF 320px);font-family:'Plus Jakarta Sans',system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;color:#131313;line-height:1.6;-webkit-font-smoothing:antialiased}
.mvn-pt-body *{box-sizing:border-box}
.pt-top{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:16px;padding:10px 20px;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.admin-bar .pt-top{top:32px}
.pt-exit{color:var(--gray);text-decoration:none;font-weight:600;font-size:14px;white-space:nowrap}
.pt-exit:hover{color:var(--b)}
.pt-title{flex:1;display:flex;flex-direction:column;line-height:1.2;min-width:0}
.pt-title b{font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pt-title small{color:var(--gray);font-size:12.5px}
.pt-timer{font-weight:800;font-size:20px;font-variant-numeric:tabular-nums;color:var(--b);background:var(--tint);padding:6px 14px;border-radius:999px}
.pt-timer.warn{color:#fff;background:var(--bad);animation:pt-pulse 1s infinite}
@keyframes pt-pulse{50%{opacity:.75}}
.pt-app{max-width:1180px;margin:0 auto;padding:24px 20px 48px}
.pt-loading{text-align:center;color:var(--gray);padding:80px 0}
.pt-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:32px;box-shadow:0 12px 32px rgba(61,74,239,.08);margin-bottom:24px}
.pt-intro{max-width:680px;margin:40px auto}
.pt-intro h1{font-size:28px;margin:6px 0 16px;line-height:1.25}
.pt-eyebrow{display:inline-block;font-size:12.5px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--b);background:var(--tint);padding:5px 12px;border-radius:999px}
.pt-rules{margin:0 0 24px;padding-left:20px;display:grid;gap:6px;color:#26262B}
.pt-actions{display:flex;flex-wrap:wrap;gap:10px}
.mvn-pt-body .pt-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:11px 20px;border-radius:999px;border:2px solid var(--line);background:#fff;color:var(--navy);font:700 15px/1.2 inherit;cursor:pointer;text-decoration:none;transition:.15s}
.mvn-pt-body .pt-btn:hover:not(:disabled){border-color:var(--b);color:var(--b)}
.mvn-pt-body .pt-btn.primary{background:var(--g);border-color:transparent;color:#fff}
.mvn-pt-body .pt-btn.primary:hover:not(:disabled){color:#fff;filter:brightness(1.06)}
.mvn-pt-body .pt-btn.ghost{border-color:transparent;color:var(--gray)}
.mvn-pt-body .pt-btn.sm{padding:7px 14px;font-size:13.5px}
.mvn-pt-body .pt-btn:disabled{opacity:.5;cursor:default}

.mvn-pt-body button{appearance:none;-webkit-appearance:none;margin:0;text-transform:none;letter-spacing:normal;white-space:normal;box-shadow:none}
.mvn-pt-body .pt-opt{text-align:left;justify-content:flex-start;white-space:normal}
.mvn-pt-body .pt-opt:hover,.mvn-pt-body .pt-opt:focus{background:#fff;color:#131313}
.mvn-pt-body .pt-opt.on:hover,.mvn-pt-body .pt-opt.on:focus{background:var(--tint)}
.mvn-pt-body .pt-grid button{padding:0;display:grid;place-items:center}
.mvn-pt-body .pt-grid button:hover{background:var(--soft);color:var(--navy)}
.mvn-pt-body .pt-grid button.done:hover{background:var(--b2);color:#fff}
.mvn-pt-body .pt-flag:hover,.mvn-pt-body .pt-flag:focus{background:none;color:var(--amber)}
/* Làm bài */
.pt-exam{display:grid;grid-template-columns:1fr 300px;gap:24px;align-items:start}
.pt-main{background:#fff;border:1px solid var(--line);border-radius:24px;padding:28px;min-height:420px}
.pt-main.has-passage{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.pt-main.has-passage .pt-nav{grid-column:1/-1}
.pt-passage{background:var(--soft);border-radius:16px;padding:20px;max-height:60vh;overflow:auto;font-size:15.5px}
.pt-passage p{margin:0 0 .8em}
.pt-audio{margin-bottom:14px}
.pt-qhead{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:12px}
.pt-qno{font-weight:800;color:var(--b)}
.pt-qtype{font-size:12.5px;font-weight:700;color:var(--gray);background:var(--soft);padding:3px 10px;border-radius:999px}
.mvn-pt-body .pt-flag{margin-left:auto;border:0;background:none;color:var(--gray);font:600 13.5px inherit;cursor:pointer}
.mvn-pt-body .pt-flag.on{color:var(--amber)}
.pt-stem{font-size:17.5px;margin-bottom:18px}
.pt-stem p{margin:0 0 .6em}
.mvn-pt-body .pt-opts{display:grid;gap:10px}
.mvn-pt-body .pt-opt{display:flex;align-items:flex-start;gap:12px;width:100%;text-align:left;padding:14px 16px;border:1.5px solid var(--line);border-radius:14px;background:#fff;font:500 16px/1.5 inherit;color:#131313;cursor:pointer;transition:.12s}
.mvn-pt-body .pt-opt b{flex:none;display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--soft);color:var(--navy);font-size:14px}
.mvn-pt-body .pt-opt:hover{border-color:#B9C2FF}
.mvn-pt-body .pt-opt.on{border-color:var(--b);background:var(--tint);box-shadow:0 0 0 3px rgba(61,74,239,.12)}
.mvn-pt-body .pt-opt.on b{background:var(--b);color:#fff}
.pt-nav{display:flex;justify-content:space-between;gap:10px;margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}
.pt-side{position:sticky;top:84px;background:#fff;border:1px solid var(--line);border-radius:24px;padding:20px}
.pt-side-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.pt-count{font-weight:800;color:var(--b)}
.pt-legend{display:flex;flex-wrap:wrap;gap:12px;font-size:12px;color:var(--gray);margin-bottom:14px}
.pt-legend i{display:inline-block;width:12px;height:12px;border-radius:4px;border:1.5px solid var(--line);margin-right:4px;vertical-align:-1px}
.pt-legend .lg-done{background:var(--b);border-color:var(--b)}
.pt-legend .lg-flag{border-color:var(--amber);background:#FFF7ED}
.pt-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:6px;max-height:50vh;overflow:auto;margin-bottom:16px}
.mvn-pt-body .pt-grid button{aspect-ratio:1;border:1.5px solid var(--line);border-radius:10px;background:#fff;font:700 13px inherit;color:var(--navy);cursor:pointer;position:relative}
.mvn-pt-body .pt-grid button.done{background:var(--b);border-color:var(--b);color:#fff}
.mvn-pt-body .pt-grid button.flag{border-color:var(--amber);box-shadow:inset 0 0 0 1px var(--amber)}
.mvn-pt-body .pt-grid button.flag::after{content:"";position:absolute;top:3px;right:3px;width:6px;height:6px;border-radius:50%;background:var(--amber)}
.mvn-pt-body .pt-grid button.cur{outline:2px solid var(--navy);outline-offset:1px}
.pt-submit{width:100%}
.mvn-pt-body .pt-grid-toggle{display:none}
.mvn-pt-body .pt-close{display:none;border:0;background:none;padding:4px 8px;font:700 14px inherit;color:var(--gray);cursor:pointer}

/* Kết quả */
.pt-result{text-align:left}
.pt-auto{background:#FFF7ED;color:#9A5B00;border-radius:12px;padding:10px 14px;font-weight:600}
.pt-score{display:flex;flex-wrap:wrap;align-items:baseline;gap:16px;margin:12px 0 4px}
.pt-score b{font-size:56px;font-weight:800;line-height:1;background:var(--g);-webkit-background-clip:text;background-clip:text;color:transparent}
.pt-score span{font-weight:700;color:var(--navy)}
.pt-note{color:var(--gray);font-size:14px}
.pt-result h2,.pt-review h2{font-size:20px;margin:28px 0 12px}
.pt-types{display:grid;gap:8px}
.pt-type{display:grid;grid-template-columns:200px 1fr 48px 56px;gap:12px;align-items:center;font-size:15px}
.pt-type .track{height:10px;border-radius:99px;background:var(--soft);overflow:hidden}
.pt-type .track i{display:block;height:100%;border-radius:99px}
.pt-type i.low{background:#FF6467}.pt-type i.mid{background:var(--amber)}.pt-type i.good{background:#1EC95B}
.pt-type b{text-align:right}.pt-type b.low{color:var(--bad)}.pt-type b.mid{color:#E07F00}.pt-type b.good{color:var(--ok)}
.pt-type em{font-style:normal;font-size:13px;font-weight:700;color:var(--gray)}
.pt-type em.up{color:var(--ok)}.pt-type em.down{color:var(--bad)}
.pt-saved{margin-top:16px;color:var(--ok);font-weight:600}
.pt-login-note{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:18px;background:var(--tint);border-radius:14px;padding:14px 16px;font-weight:600}
.pt-next{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.pt-next-card{display:flex;flex-direction:column;gap:4px;padding:16px;border:1.5px solid var(--line);border-radius:16px;text-decoration:none;color:var(--navy)}
.pt-next-card:hover{border-color:var(--b)}
.pt-next-card span{color:var(--gray);font-size:14px}
.pt-review-head{display:flex;justify-content:space-between;align-items:center;gap:12px}
.pt-review-head label{font-weight:600;font-size:14.5px;cursor:pointer}
.pt-rv{border-top:1px solid var(--line);padding:20px 0}
.only-wrong .pt-rv.ok{display:none}
.pt-tag{font-size:12.5px;font-weight:800;padding:3px 10px;border-radius:999px}
.pt-tag.ok{color:var(--ok);background:var(--okbg)}.pt-tag.bad{color:var(--bad);background:var(--badbg)}
.pt-rv-opts{list-style:none;margin:0 0 12px;padding:0;display:grid;gap:6px}
.pt-rv-opts li{padding:9px 14px;border-radius:12px;border:1.5px solid var(--line)}
.pt-rv-opts li.ok{border-color:#86E3A8;background:var(--okbg)}
.pt-rv-opts li.bad{border-color:#FFB4B4;background:var(--badbg)}
.pt-rv-opts em{font-style:normal;font-size:13px;color:var(--gray)}
.pt-exp{background:var(--soft);border-radius:12px;padding:12px 14px;font-size:15px}
.pt-rv-passage{background:var(--soft);border-radius:14px;padding:12px 16px;margin-top:16px}
.pt-rv-passage summary{cursor:pointer;font-weight:700;color:var(--b)}

@media (max-width:900px){
  .admin-bar .pt-top{top:46px}
  .pt-app{padding:14px 12px 96px}
  .pt-exam{grid-template-columns:1fr}
  .pt-main,.pt-main.has-passage{display:block;padding:18px;border-radius:18px;min-height:0}
  .pt-passage{max-height:40vh;margin-bottom:16px}
  .pt-side{position:fixed;left:0;right:0;bottom:0;top:auto;z-index:60;border-radius:20px 20px 0 0;transform:translateY(105%);transition:transform .25s;box-shadow:0 -12px 32px rgba(15,23,48,.18);padding-bottom:calc(20px + env(safe-area-inset-bottom))}
  .pt-grid{grid-template-columns:repeat(8,1fr)}
  .pt-grid-open .pt-side{transform:none}
  .mvn-pt-body .pt-close{display:inline-block}
  .pt-side-head{gap:10px}
  .pt-side-head b{flex:1}
  .mvn-pt-body .pt-grid-toggle{display:block;position:fixed;right:14px;bottom:calc(84px + env(safe-area-inset-bottom));z-index:55;border:0;border-radius:999px;padding:12px 18px;background:var(--navy);color:#fff;font:700 14px inherit;box-shadow:0 8px 24px rgba(15,23,48,.3)}
  .mvn-pt-body.pt-grid-open .pt-grid-toggle{display:none}
  .pt-nav{position:sticky;bottom:0;background:#fff;margin:20px -18px -18px;padding:12px 18px;border-radius:0 0 18px 18px}
  .mvn-pt-body .pt-nav .pt-btn{flex:1}
  .pt-stem{font-size:16.5px}
  .pt-card{padding:22px;border-radius:18px}
  .pt-type{grid-template-columns:120px 1fr 42px 48px;font-size:13.5px}
  .pt-next{grid-template-columns:1fr}
  .pt-score b{font-size:44px}
  .pt-title small{display:none}
}