/* =====================================================================
   SAKOS AI ACADEMY — Bảng định kiểu
   Mã hiệu: SAKOS-AI-WEB-001 · V1.0
   Bảng màu thương hiệu: navy #1B3A6B · đỏ #C8102E · vàng #B8860B
   ===================================================================== */

:root{
  --navy:#1B3A6B; --navy-2:#254a86; --navy-d:#12294d; --navy-x:#0b1b34;
  --red:#C8102E;  --red-d:#9d0c24;
  --gold:#B8860B; --gold-l:#d9a520;
  --teal:#0E7C7B; --green:#2E7D32; --blue:#1565C0; --violet:#5B3FA8; --amber:#B4690E;

  --bg:#eef2f8; --bg-2:#e5ebf4; --card:#ffffff; --card-2:#f7f9fc;
  --ink:#1a2233; --ink-2:#41506b; --muted:#66748d; --line:#dfe6f0; --line-2:#eef2f7;
  --shadow:0 1px 2px rgba(16,32,64,.04), 0 6px 20px rgba(16,32,64,.07);
  --shadow-lg:0 12px 40px rgba(12,26,54,.18);
  --r:14px; --r-sm:9px; --r-lg:20px;
  --ff:"Segoe UI",Roboto,-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  --fm:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
  --fs:15px;
  --topbar:58px;
}
html[data-theme="dark"]{
  --bg:#0e1626; --bg-2:#0a1220; --card:#151f33; --card-2:#1b2740;
  --ink:#e8eefb; --ink-2:#c0cbe2; --muted:#8b9bb8; --line:#26334d; --line-2:#1e2a42;
  --navy:#3f6fb5; --navy-2:#5486cf; --navy-d:#24406b;
  --shadow:0 1px 2px rgba(0,0,0,.3), 0 6px 20px rgba(0,0,0,.35);
  --shadow-lg:0 12px 40px rgba(0,0,0,.55);
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:var(--ff); font-size:var(--fs); line-height:1.55; color:var(--ink);
  background:var(--bg); -webkit-font-smoothing:antialiased;
  overflow-wrap:break-word;
}
body.fs-lg{--fs:16.5px} body.fs-xl{--fs:18px}
a{color:var(--navy-2);text-decoration:none} a:hover{text-decoration:underline}
img{max-width:100%}
button,input,select,textarea{font-family:inherit;font-size:14px;color:inherit}
button{cursor:pointer;border:0;background:none}
.hidden{display:none !important}
.nowrap{white-space:nowrap}
::selection{background:rgba(27,58,107,.18)}

/* ---------- Thanh cuộn ---------- */
*::-webkit-scrollbar{width:10px;height:10px}
*::-webkit-scrollbar-thumb{background:var(--line);border-radius:8px;border:2px solid var(--bg)}
*::-webkit-scrollbar-thumb:hover{background:var(--muted)}
*::-webkit-scrollbar-track{background:transparent}

/* =====================  NÚT  ===================== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;
  padding:9px 16px;border-radius:var(--r-sm);font-weight:600;font-size:14px;
  background:var(--navy);color:#fff;transition:.15s;border:1px solid transparent;line-height:1.3}
.btn:hover{background:var(--navy-2);text-decoration:none}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
.btn.ghost{background:var(--card);color:var(--navy);border-color:var(--line)}
.btn.ghost:hover{background:var(--card-2);border-color:var(--navy)}
.btn.red{background:var(--red)} .btn.red:hover{background:var(--red-d)}
.btn.green{background:var(--green)} .btn.green:hover{filter:brightness(1.1)}
.btn.gold{background:var(--gold)} .btn.gold:hover{background:var(--gold-l)}
.btn.teal{background:var(--teal)} .btn.teal:hover{filter:brightness(1.12)}
.btn.sm{padding:6px 11px;font-size:12.5px;border-radius:7px}
.btn.lg{padding:13px 26px;font-size:15.5px}
.btn.block{width:100%}
.btn.link{background:none;color:var(--navy-2);padding:4px 6px;font-weight:600}
.btn.link:hover{background:var(--card-2)}
.btn-row{display:flex;flex-wrap:wrap;gap:8px}

/* =====================  Ô NHẬP  ===================== */
.field{margin-bottom:13px}
.field > label{display:block;font-size:12.5px;font-weight:700;color:var(--ink-2);margin-bottom:5px;letter-spacing:.2px}
.inp,input[type=text],input[type=password],input[type=email],input[type=number],
input[type=date],input[type=datetime-local],select,textarea{
  width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:var(--r-sm);
  background:var(--card);color:var(--ink);transition:.15s;outline:none}
.inp:focus,input:focus,select:focus,textarea:focus{border-color:var(--navy-2);box-shadow:0 0 0 3px rgba(37,74,134,.14)}
textarea{min-height:90px;resize:vertical;line-height:1.5}
select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);
  background-position:calc(100% - 16px) 51%,calc(100% - 11px) 51%;background-size:5px 5px,5px 5px;background-repeat:no-repeat;padding-right:32px}
.hint{font-size:12px;color:var(--muted);margin-top:4px}
.check{display:flex;align-items:flex-start;gap:9px;font-size:13.5px;cursor:pointer;user-select:none}
.check input{width:17px;height:17px;margin-top:2px;flex:none;accent-color:var(--navy)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:0 14px}
@media(max-width:700px){.grid2,.grid3{grid-template-columns:1fr}}

/* =====================  THẺ  ===================== */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow)}
.card-p{padding:18px}
.card-h{padding:14px 18px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.card-h h3{font-size:15px;font-weight:700;color:var(--navy);letter-spacing:.2px}
.card-h .grow{flex:1}
.card-b{padding:18px}
.sec-title{font-size:13px;font-weight:800;letter-spacing:1.1px;text-transform:uppercase;color:var(--muted);margin:26px 0 12px}
.sec-title:first-child{margin-top:0}

/* =====================  NHÃN  ===================== */
.tag{display:inline-flex;align-items:center;gap:5px;padding:3px 9px;border-radius:20px;
  font-size:11.5px;font-weight:700;background:var(--card-2);color:var(--ink-2);border:1px solid var(--line);white-space:nowrap}
.tag.navy{background:rgba(27,58,107,.1);color:var(--navy);border-color:rgba(27,58,107,.2)}
.tag.green{background:rgba(46,125,50,.12);color:#2E7D32;border-color:rgba(46,125,50,.25)}
.tag.red{background:rgba(200,16,46,.1);color:var(--red);border-color:rgba(200,16,46,.22)}
.tag.gold{background:rgba(184,134,11,.13);color:#8a6508;border-color:rgba(184,134,11,.28)}
.tag.teal{background:rgba(14,124,123,.12);color:var(--teal);border-color:rgba(14,124,123,.25)}
.tag.violet{background:rgba(91,63,168,.12);color:var(--violet);border-color:rgba(91,63,168,.25)}
html[data-theme="dark"] .tag.gold{color:var(--gold-l)}

/* =====================  BỐ CỤC KHUNG  ===================== */
#topbar{position:sticky;top:0;z-index:60;height:var(--topbar);
  background:linear-gradient(110deg,var(--navy-x),var(--navy-d) 55%,var(--navy));
  color:#fff;box-shadow:0 2px 14px rgba(9,20,45,.28)}
#topbar .in{max-width:1400px;margin:0 auto;height:100%;padding:0 16px;display:flex;align-items:center;gap:14px}
.logo{width:38px;height:38px;border-radius:10px;background:#fff;color:var(--navy);flex:none;
  display:flex;align-items:center;justify-content:center;font-weight:900;font-size:12px;letter-spacing:-.4px}
.brand b{display:block;font-size:14.5px;letter-spacing:.5px;line-height:1.2}
.brand span{font-size:10.5px;opacity:.8;letter-spacing:.4px}
#topbar .grow{flex:1}
.tb-btn{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.12);
  color:#fff;padding:7px 12px;border-radius:8px;font-size:12.5px;font-weight:600;transition:.15s}
.tb-btn:hover{background:rgba(255,255,255,.22);text-decoration:none}
.who{text-align:right;font-size:12px;line-height:1.3;opacity:.95}
.who b{display:block;font-size:13px}
@media(max-width:820px){.who{display:none}.brand span{display:none}}

#shell{display:flex;min-height:calc(100vh - var(--topbar))}
#side{width:236px;flex:none;background:var(--card);border-right:1px solid var(--line);
  padding:14px 10px;position:sticky;top:var(--topbar);height:calc(100vh - var(--topbar));overflow-y:auto}
#main{flex:1;min-width:0;padding:22px 20px 70px;max-width:1180px;margin:0 auto;width:100%}
.nav-g{font-size:10.5px;font-weight:800;letter-spacing:1.2px;text-transform:uppercase;
  color:var(--muted);padding:14px 12px 6px}
.nav-i{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:9px;
  font-size:13.5px;font-weight:600;color:var(--ink-2);cursor:pointer;transition:.13s;margin-bottom:1px}
.nav-i:hover{background:var(--card-2);color:var(--navy)}
.nav-i.on{background:var(--navy);color:#fff}
.nav-i .ic{width:19px;text-align:center;flex:none;font-size:15px}
.nav-i .badge{margin-left:auto;background:var(--red);color:#fff;font-size:10.5px;font-weight:800;
  padding:1px 7px;border-radius:20px}
.nav-i.on .badge{background:rgba(255,255,255,.28)}

#mobnav{display:none}
@media(max-width:900px){
  #side{display:none}
  #side.open{display:block;position:fixed;left:0;top:var(--topbar);z-index:55;box-shadow:var(--shadow-lg);width:270px}
  #mobnav{display:inline-flex}
  #main{padding:16px 13px 60px}
  #scrim.on{display:block;position:fixed;inset:var(--topbar) 0 0 0;background:rgba(6,14,30,.45);z-index:50}
}

/* =====================  ĐĂNG NHẬP  ===================== */
#login{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;
  background:radial-gradient(1100px 620px at 22% 12%,#26508f 0%,transparent 62%),
             radial-gradient(900px 560px at 82% 88%,#7c1226 0%,transparent 58%),
             linear-gradient(135deg,#0b1b34,#12294d 55%,#0d2246)}
.login-card{background:var(--card);border-radius:var(--r-lg);box-shadow:0 24px 70px rgba(0,0,0,.42);
  width:100%;max-width:470px;padding:30px 30px 24px}
.login-card .blogo{font-size:29px;font-weight:900;letter-spacing:3.5px;color:var(--navy);text-align:center}
.login-card .blogo i{color:var(--red);font-style:normal}
.login-card .tl{text-align:center;font-size:12.5px;color:var(--muted);margin:5px 0 3px}
.login-card .iso{text-align:center;font-size:10.5px;color:var(--gold);font-weight:800;letter-spacing:.6px;margin-bottom:18px}
.login-card h2{font-size:16px;text-align:center;color:var(--navy);margin-bottom:15px}
.login-foot{text-align:center;font-size:11.5px;color:var(--muted);margin-top:16px;line-height:1.6}
.tabsw{display:flex;background:var(--card-2);border:1px solid var(--line);border-radius:10px;padding:3px;margin-bottom:16px}
.tabsw button{flex:1;padding:8px;border-radius:7px;font-size:13px;font-weight:700;color:var(--muted)}
.tabsw button.on{background:var(--card);color:var(--navy);box-shadow:var(--shadow)}

/* =====================  BẢNG  ===================== */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--card)}
table.tbl{width:100%;border-collapse:collapse;font-size:13.5px;min-width:520px}
table.tbl th{background:var(--card-2);color:var(--navy);font-weight:800;text-align:left;
  padding:10px 12px;border-bottom:2px solid var(--line);white-space:nowrap;font-size:12.5px;
  position:sticky;top:0;z-index:2}
table.tbl td{padding:9px 12px;border-bottom:1px solid var(--line-2);vertical-align:top}
table.tbl tbody tr:hover{background:var(--card-2)}
table.tbl tbody tr:last-child td{border-bottom:0}
table.tbl td.num,table.tbl th.num{text-align:right;font-variant-numeric:tabular-nums}
table.tbl td.ctr,table.tbl th.ctr{text-align:center}

/* Bảng trong học liệu */
.doc-tbl{width:100%;border-collapse:collapse;font-size:13.5px;margin:12px 0;background:var(--card)}
.doc-tbl td,.doc-tbl th{border:1px solid var(--line);padding:8px 10px;vertical-align:top}
.doc-tbl tr:first-child td{background:var(--card-2);font-weight:700;color:var(--navy)}
.doc-scroll{overflow-x:auto;margin:12px 0}

/* =====================  THANH TIẾN ĐỘ  ===================== */
.bar{height:7px;background:var(--line);border-radius:20px;overflow:hidden}
.bar > i{display:block;height:100%;background:linear-gradient(90deg,var(--navy),var(--navy-2));border-radius:20px;transition:width .4s}
.bar.green > i{background:linear-gradient(90deg,#2E7D32,#4caf50)}
.bar.red   > i{background:linear-gradient(90deg,var(--red),#e04a60)}
.bar.gold  > i{background:linear-gradient(90deg,var(--gold),var(--gold-l))}

/* =====================  KPI  ===================== */
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(158px,1fr));gap:12px}
.kpi{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;box-shadow:var(--shadow)}
.kpi .k{font-size:11px;font-weight:800;letter-spacing:.7px;text-transform:uppercase;color:var(--muted)}
.kpi .v{font-size:26px;font-weight:800;color:var(--navy);line-height:1.25;font-variant-numeric:tabular-nums}
.kpi .s{font-size:11.5px;color:var(--muted)}
.kpi.red .v{color:var(--red)} .kpi.green .v{color:var(--green)} .kpi.gold .v{color:var(--gold)}

/* =====================  THẺ KHÓA HỌC  ===================== */
.courses{display:grid;grid-template-columns:repeat(auto-fill,minmax(285px,1fr));gap:14px}
.course{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column;transition:.18s;cursor:pointer}
.course:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.course .top{padding:15px 16px;color:#fff;position:relative;overflow:hidden}
.course .top::after{content:"";position:absolute;right:-26px;top:-30px;width:120px;height:120px;
  border-radius:50%;background:rgba(255,255,255,.09)}
.course .top .cc{font-size:10.5px;font-weight:800;letter-spacing:1.2px;opacity:.85}
.course .top h4{font-size:15.5px;font-weight:800;margin-top:2px;position:relative;z-index:1}
.course .bd{padding:14px 16px;flex:1;display:flex;flex-direction:column;gap:10px}
.course .bd p{font-size:12.8px;color:var(--muted);line-height:1.5;flex:1}
.course .mt{display:flex;gap:8px;flex-wrap:wrap;font-size:11.5px;color:var(--muted)}

/* =====================  TRÌNH ĐỌC HỌC LIỆU  ===================== */
.reader{display:grid;grid-template-columns:270px 1fr;gap:16px;align-items:start}
@media(max-width:980px){.reader{grid-template-columns:1fr}}
.toc{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  max-height:calc(100vh - var(--topbar) - 60px);overflow-y:auto;position:sticky;top:calc(var(--topbar) + 14px)}
@media(max-width:980px){.toc{position:static;max-height:290px}}
.toc .it{padding:9px 13px;font-size:13px;border-bottom:1px solid var(--line-2);cursor:pointer;
  display:flex;gap:9px;align-items:flex-start;line-height:1.4}
.toc .it:hover{background:var(--card-2)}
.toc .it.on{background:rgba(27,58,107,.09);color:var(--navy);font-weight:700;
  box-shadow:inset 3px 0 0 var(--navy)}
.toc .it .n{font-size:11px;font-weight:800;color:var(--muted);min-width:20px}
.toc .it.done .n::after{content:"✓";color:var(--green);margin-left:3px}

.doc{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:26px 30px;box-shadow:var(--shadow)}
@media(max-width:600px){.doc{padding:18px 15px}}
.doc h1{font-size:22px;color:var(--navy);margin:0 0 4px;line-height:1.3}
.doc h2{font-size:17px;color:var(--navy);margin:24px 0 9px;padding-bottom:6px;border-bottom:2px solid var(--line);line-height:1.35}
.doc h3{font-size:15px;color:var(--navy-2);margin:18px 0 7px}
.doc p{margin:9px 0;line-height:1.72;color:var(--ink)}
.doc li{margin:6px 0 6px 22px;line-height:1.68;list-style:disc}
.doc b{color:var(--ink);font-weight:700}
.doc .note{background:var(--card-2);border-left:4px solid var(--gold);padding:12px 15px;border-radius:0 9px 9px 0;margin:14px 0}
.doc mark{background:rgba(184,134,11,.28);color:inherit;padding:0 2px;border-radius:3px}

/* =====================  CÂU HỎI  ===================== */
.q-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px 20px;margin-bottom:14px;box-shadow:var(--shadow)}
.q-head{display:flex;gap:9px;align-items:center;flex-wrap:wrap;margin-bottom:11px}
.q-no{background:var(--navy);color:#fff;font-weight:800;font-size:12.5px;
  min-width:30px;height:26px;padding:0 8px;border-radius:7px;display:inline-flex;align-items:center;justify-content:center}
.q-stem{font-size:15px;font-weight:600;line-height:1.6;margin-bottom:13px}
.opts{display:flex;flex-direction:column;gap:8px}
.opt{display:flex;gap:11px;align-items:flex-start;padding:11px 14px;border:1.5px solid var(--line);
  border-radius:10px;cursor:pointer;transition:.13s;background:var(--card);line-height:1.55}
.opt:hover{border-color:var(--navy-2);background:var(--card-2)}
.opt .lt{width:25px;height:25px;border-radius:50%;background:var(--card-2);border:1.5px solid var(--line);
  font-weight:800;font-size:12.5px;display:flex;align-items:center;justify-content:center;flex:none;color:var(--ink-2)}
.opt.sel{border-color:var(--navy);background:rgba(27,58,107,.07)}
.opt.sel .lt{background:var(--navy);color:#fff;border-color:var(--navy)}
.opt.ok{border-color:var(--green);background:rgba(46,125,50,.09)}
.opt.ok .lt{background:var(--green);color:#fff;border-color:var(--green)}
.opt.bad{border-color:var(--red);background:rgba(200,16,46,.08)}
.opt.bad .lt{background:var(--red);color:#fff;border-color:var(--red)}
.opt.dis{cursor:default;pointer-events:none}
.expl{margin-top:12px;padding:12px 15px;background:var(--card-2);border-left:4px solid var(--teal);
  border-radius:0 9px 9px 0;font-size:13.5px;line-height:1.6}
.expl b{color:var(--teal)}

/* =====================  KHUNG THI  ===================== */
#exambar{position:sticky;top:var(--topbar);z-index:40;background:var(--card);
  border-bottom:1px solid var(--line);padding:9px 16px;display:flex;align-items:center;gap:12px;
  flex-wrap:wrap;box-shadow:0 2px 10px rgba(16,32,64,.07)}
.clock{font-family:var(--fm);font-size:21px;font-weight:800;color:var(--navy);
  background:var(--card-2);padding:4px 13px;border-radius:9px;border:1px solid var(--line);
  font-variant-numeric:tabular-nums;letter-spacing:.5px}
.clock.warn{color:var(--gold);border-color:var(--gold);background:rgba(184,134,11,.1)}
.clock.crit{color:#fff;background:var(--red);border-color:var(--red);animation:pulse 1s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.72}}
.qnav{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px}
.qnav button{height:34px;border-radius:7px;border:1.5px solid var(--line);background:var(--card);
  font-size:12.5px;font-weight:700;color:var(--ink-2);transition:.12s}
.qnav button:hover{border-color:var(--navy-2)}
.qnav button.ans{background:var(--navy);border-color:var(--navy);color:#fff}
.qnav button.flag{border-color:var(--gold);box-shadow:inset 0 0 0 2px rgba(184,134,11,.35)}
.qnav button.cur{outline:3px solid var(--gold);outline-offset:1px}
.noselect{-webkit-user-select:none;-moz-user-select:none;user-select:none}

/* =====================  KẾT QUẢ  ===================== */
.result-hero{border-radius:var(--r-lg);padding:26px;color:#fff;text-align:center;box-shadow:var(--shadow-lg)}
.result-hero.pass{background:linear-gradient(135deg,#1b5e20,#2E7D32 55%,#43a047)}
.result-hero.fail{background:linear-gradient(135deg,#8e0c22,#C8102E 55%,#e03a52)}
.result-hero .score{font-size:56px;font-weight:900;line-height:1;font-variant-numeric:tabular-nums}
.result-hero .lbl{font-size:16px;font-weight:800;letter-spacing:1.6px;text-transform:uppercase;margin-top:7px}
.result-hero .sub{font-size:13px;opacity:.92;margin-top:6px}
.vcode{font-family:var(--fm);font-size:13px;letter-spacing:1.4px;background:rgba(255,255,255,.18);
  padding:5px 13px;border-radius:8px;display:inline-block;margin-top:11px}

.cert{border:8px double var(--gold);border-radius:8px;padding:32px;text-align:center;background:var(--card);
  background-image:radial-gradient(circle at 50% 0,rgba(184,134,11,.07),transparent 60%)}
.cert .t1{font-size:12px;letter-spacing:3.5px;color:var(--muted);font-weight:700}
.cert .t2{font-size:26px;font-weight:900;color:var(--navy);letter-spacing:1.5px;margin:9px 0}
.cert .nm{font-size:23px;font-weight:800;color:var(--red);margin:14px 0 5px}
.cert .no{font-family:var(--fm);font-size:12px;color:var(--muted);margin-top:14px}

/* =====================  THÔNG BÁO / MODAL  ===================== */
/* Vùng chứa thông báo KHÔNG chặn thao tác: chỉ bản thân thẻ thông báo nhận chuột */
#toasts{position:fixed;right:16px;bottom:16px;z-index:200;display:flex;flex-direction:column;gap:9px;
  max-width:min(390px,92vw);pointer-events:none}
.toast{pointer-events:auto;background:var(--card);border:1px solid var(--line);border-left:5px solid var(--navy);
  border-radius:11px;padding:11px 15px;box-shadow:var(--shadow-lg);font-size:13.5px;
  animation:slidein .22s ease-out;display:flex;gap:10px;align-items:flex-start}
.toast.ok{border-left-color:var(--green)} .toast.err{border-left-color:var(--red)} .toast.warn{border-left-color:var(--gold)}
@keyframes slidein{from{opacity:0;transform:translateX(24px)}to{opacity:1;transform:none}}

#modal{position:fixed;inset:0;z-index:150;background:rgba(8,17,36,.55);display:none;
  align-items:center;justify-content:center;padding:18px;backdrop-filter:blur(2px)}
#modal.on{display:flex}
.mbox{background:var(--card);border-radius:var(--r-lg);box-shadow:var(--shadow-lg);
  width:100%;max-width:620px;max-height:88vh;display:flex;flex-direction:column;overflow:hidden}
.mbox.wide{max-width:1000px}
.mbox .mh{padding:16px 20px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px}
.mbox .mh h3{font-size:16px;color:var(--navy);flex:1}
.mbox .mb{padding:20px;overflow-y:auto;flex:1}
.mbox .mf{padding:14px 20px;border-top:1px solid var(--line);display:flex;gap:9px;justify-content:flex-end;flex-wrap:wrap}
.xbtn{width:31px;height:31px;border-radius:8px;font-size:19px;color:var(--muted);
  display:flex;align-items:center;justify-content:center;line-height:1}
.xbtn:hover{background:var(--card-2);color:var(--red)}

/* =====================  TABS  ===================== */
.tabs{display:flex;gap:3px;border-bottom:2px solid var(--line);margin-bottom:18px;overflow-x:auto;padding-bottom:0}
.tabs button{padding:9px 15px;font-size:13.5px;font-weight:700;color:var(--muted);
  border-bottom:3px solid transparent;margin-bottom:-2px;white-space:nowrap;border-radius:8px 8px 0 0}
.tabs button:hover{color:var(--navy);background:var(--card-2)}
.tabs button.on{color:var(--navy);border-bottom-color:var(--navy)}

/* =====================  TIỆN ÍCH  ===================== */
.empty{text-align:center;padding:44px 20px;color:var(--muted)}
.empty .ic{font-size:40px;opacity:.35;margin-bottom:9px}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.row.between{justify-content:space-between}
.grow{flex:1}
.mt{margin-top:14px}.mt2{margin-top:24px}.mb{margin-bottom:14px}
.muted{color:var(--muted)} .small{font-size:12.5px} .b{font-weight:700}
.center{text-align:center}
.mono{font-family:var(--fm)}
.crit-note{background:rgba(200,16,46,.07);border:1px solid rgba(200,16,46,.24);
  border-radius:10px;padding:12px 15px;font-size:13px;color:var(--red)}
html[data-theme="dark"] .crit-note{color:#ff8a9e}
.warnbox{background:rgba(184,134,11,.1);border:1px solid rgba(184,134,11,.3);
  border-radius:10px;padding:12px 15px;font-size:13px}
.okbox{background:rgba(46,125,50,.09);border:1px solid rgba(46,125,50,.26);border-radius:10px;padding:12px 15px;font-size:13px}
.spin{width:19px;height:19px;border:2.5px solid var(--line);border-top-color:var(--navy);
  border-radius:50%;animation:sp .7s linear infinite;display:inline-block;vertical-align:-4px}
@keyframes sp{to{transform:rotate(360deg)}}
#loading{position:fixed;inset:0;background:var(--bg);z-index:300;display:flex;
  align-items:center;justify-content:center;flex-direction:column;gap:14px}

.modechip{font-size:10.5px;font-weight:800;letter-spacing:.6px;padding:3px 9px;border-radius:20px;
  background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.3)}
.modechip.off{background:rgba(184,134,11,.9);border-color:transparent}

/* =====================  IN ẤN  ===================== */
@media print{
  #topbar,#side,#exambar,#toasts,.noprint,.btn{display:none !important}
  #main{padding:0;max-width:none}
  body{background:#fff;font-size:12pt}
  .card,.doc{box-shadow:none;border:1px solid #ccc;break-inside:avoid}
  .result-hero{-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .cert{-webkit-print-color-adjust:exact;print-color-adjust:exact;page-break-inside:avoid}
}

/* ===================== THƯ VIỆN PROMPT & THỰC TẬP VIẾT PROMPT ===================== */
.card-b.p0{padding:0}
.grid2-70{display:grid;grid-template-columns:1.9fr 1fr;gap:16px}
@media (max-width:900px){.grid2-70{grid-template-columns:1fr}}

.promptpart{border:1px solid var(--line);border-radius:10px;margin-bottom:10px;overflow:hidden}
.promptpart .pp-h{background:var(--soft);padding:8px 12px;font-size:13px;border-bottom:1px solid var(--line)}
.promptpart .pp-b{padding:11px 13px;font-size:14px;line-height:1.62;white-space:pre-wrap}

.scorewrap{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.scorebig{font-size:46px;font-weight:800;line-height:1;padding:14px 20px;border-radius:14px;
  border:2px solid currentColor;min-width:150px;text-align:center}
.scorebig span{font-size:16px;font-weight:600;opacity:.65}
.scorebig.green{color:#2E7D32;background:rgba(46,125,50,.08)}
.scorebig.teal {color:#0E7C7B;background:rgba(14,124,123,.08)}
.scorebig.gold {color:#B8860B;background:rgba(184,134,11,.09)}
.scorebig.red  {color:#C8102E;background:rgba(200,16,46,.08)}

#tIn{font-family:ui-monospace,"Cascadia Mono",Consolas,monospace;font-size:13.5px;line-height:1.6}

/* Bảng nhập prompt theo khung R-T-C-R-F ở màn Thực tập viết prompt */
.rtcrf-tbl td{vertical-align:top;padding:10px 12px}
.rtcrf-tbl thead th{white-space:nowrap}
textarea.rtcrf{width:100%;min-height:74px;font-size:14px;line-height:1.6;resize:vertical}
textarea.rtcrf::placeholder{font-style:italic;opacity:.55}
.scorebig{min-width:150px;text-align:center}