:root{
  --ink:#0F1E3A;--text:#3A4660;--muted:#5B6780;--faint:#9AA5BD;
  --line:#E3E8F2;--line2:#EEF1F7;--bg:#F5F7FB;--bg2:#DCE3EE;--card:#FFFFFF;--soft:#F1F4F9;--soft2:#F8FAFD;
  --accent:#1F4FD8;--accent-dark:#163BA6;--accent-bg:#E8EEFC;
  --ok:#15803D;--ok-bg:#DCFCE7;--ok-soft:#F0FDF4;
  --bad:#B91C1C;--bad-line:#DC2626;--bad-bg:#FEE2E2;--bad-soft:#FEF2F2;
  --warn:#92400E;--warn-line:#B45309;--warn-bg:#FEF3C7;--warn-soft:#FFFBEB;
  --navy:#0F1E3A;--navy2:#1B2D52;--navy-line:#2B4476;
  --font:Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --display:"Plus Jakarta Sans",Inter,system-ui,sans-serif;
  --radius:10px;--radius-lg:14px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}
a{color:var(--accent)}a:hover{color:var(--accent-dark)}
img{max-width:100%;display:block}
h1,h2,h3,h4{font-family:var(--display);margin:0;letter-spacing:-.01em;line-height:1.2}
h1{font-size:26px;font-weight:800}h2{font-size:18px;font-weight:700}h3{font-size:16px;font-weight:700}
p{margin:0}
.container{max-width:1400px;margin:0 auto;padding:0 24px}
.container-sm{max-width:1100px;margin:0 auto;padding:0 24px}
.container-xs{max-width:760px;margin:0 auto;padding:0 24px}
.muted{color:var(--muted)}.faint{color:var(--faint)}.small{font-size:13px}.tiny{font-size:12px}.b{font-weight:600}.bb{font-weight:700}
.ok{color:var(--ok)}.bad{color:var(--bad)}.warn{color:var(--warn)}.blue{color:var(--accent)}
.nowrap{white-space:nowrap}.right{text-align:right}.center{text-align:center}.num{font-variant-numeric:tabular-nums}
.row{display:flex;flex-wrap:wrap;align-items:center;gap:10px}.row-between{justify-content:space-between}.row-end{justify-content:flex-end}
.col{display:flex;flex-direction:column;gap:10px}.grow{flex:1 1 auto;min-width:0}.ml-auto{margin-left:auto}
.gap-4{gap:4px}.gap-6{gap:6px}.gap-8{gap:8px}.gap-16{gap:16px}.gap-20{gap:20px}.gap-28{gap:28px}
.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mb-8{margin-bottom:8px}.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}
.hide{display:none!important}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:40px;padding:0 16px;border-radius:var(--radius);border:1px solid var(--line);background:#fff;color:var(--ink);font:inherit;font-size:14px;font-weight:600;cursor:pointer;text-decoration:none;white-space:nowrap;transition:background .12s,border-color .12s}
.btn:hover{background:var(--soft2);color:var(--ink)}
.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-dark);border-color:var(--accent-dark);color:#fff}
.btn-ghost{background:transparent;border-color:transparent;color:var(--muted)}.btn-ghost:hover{background:var(--soft)}
.btn-danger{background:var(--bad-soft);border-color:#FCA5A5;color:var(--bad)}.btn-danger:hover{background:var(--bad-bg);color:var(--bad)}
.btn-ok{background:var(--ok-bg);border-color:#86EFAC;color:var(--ok)}
.btn-warn{background:var(--warn-soft);border-color:#FCD34D;color:var(--warn)}
.btn-soft{background:var(--accent-bg);border-color:var(--accent-bg);color:var(--accent)}.btn-soft:hover{background:#DCE5FB;color:var(--accent)}
.btn-sm{height:32px;padding:0 11px;font-size:13px;border-radius:8px}
.btn-lg{height:48px;padding:0 20px;font-size:15px;font-weight:700}
.btn-block{width:100%}
.btn[disabled],.btn.disabled{opacity:.45;cursor:not-allowed;pointer-events:none}
.link{background:none;border:0;padding:0;font:inherit;font-size:13px;font-weight:600;color:var(--accent);cursor:pointer;text-decoration:none}.link:hover{color:var(--accent-dark)}
.link-danger{color:var(--bad)}.link-danger:hover{color:#991B1B}
.sep{color:#CBD3E1;margin:0 8px}

/* forms */
.field{display:flex;flex-direction:column;gap:6px}
.label{font-size:13px;font-weight:600;color:var(--text)}
.input,.select,.textarea{height:44px;padding:0 12px;border:1px solid #CBD3E1;border-radius:var(--radius);background:#fff;font:inherit;font-size:14px;color:var(--ink);width:100%}
.textarea{height:auto;padding:10px 12px;line-height:1.5;resize:vertical;min-height:88px}
.input:focus,.select:focus,.textarea:focus{outline:2px solid var(--accent-bg);border-color:var(--accent)}
.input-sm,.select-sm{height:38px;font-size:14px;border-radius:8px}
.select{appearance:auto;padding-right:28px}
.check{display:inline-flex;align-items:center;gap:8px;font-size:14px;cursor:pointer}
.check input{width:16px;height:16px;margin:0;accent-color:var(--accent)}
.check-box{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 12px;border:1px solid var(--line);border-radius:var(--radius);font-size:14px;cursor:pointer}
.check-box input{width:18px;height:18px;margin:0;accent-color:var(--accent)}
.help{font-size:12px;color:var(--muted);line-height:1.5}
.error{font-size:12px;color:var(--bad);font-weight:600}
.has-error .input,.has-error .select,.has-error .textarea{border-color:var(--bad-line)}
.search{position:relative;display:flex;align-items:center;flex:1 1 240px;max-width:360px}
.search svg{position:absolute;left:12px;color:var(--muted)}
.search .input{padding-left:36px}
.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* cards */
.card{background:var(--card);border-radius:12px;box-shadow:0 1px 2px rgba(15,30,58,.08)}
.card-b{border:1px solid var(--line);box-shadow:none}
.card-h{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;padding:16px 20px;border-bottom:1px solid var(--line)}
.card-c{padding:20px}
.card-f{padding:12px 20px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;font-size:13px;color:var(--muted)}
.panel{background:#fff;border-radius:0 0 12px 12px;box-shadow:0 1px 2px rgba(15,30,58,.08)}

/* pills */
.pill{display:inline-flex;align-items:center;gap:6px;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:700;white-space:nowrap;background:var(--soft);color:var(--text)}
.pill .dot{width:6px;height:6px;border-radius:50%;background:currentColor}
.pill-ok{background:var(--ok-bg);color:var(--ok)}.pill-bad{background:var(--bad-bg);color:var(--bad)}.pill-warn{background:var(--warn-bg);color:var(--warn)}.pill-blue{background:var(--accent-bg);color:var(--accent)}.pill-gray{background:var(--soft);color:var(--text)}
.pill-outline{background:#fff;border:1.5px dashed var(--accent);color:var(--accent)}

/* tables */
.table-wrap{overflow-x:auto}
.table{width:100%;border-collapse:collapse;font-size:14px}
.table th{text-align:left;padding:0 16px;height:44px;font-size:12px;font-weight:600;color:var(--muted);background:var(--soft2);border-bottom:1px solid var(--line);white-space:nowrap}
.table td{padding:0 16px;height:52px;border-bottom:1px solid var(--line2);white-space:nowrap;vertical-align:middle}
.table tr:last-child td{border-bottom:0}
.table th:first-child,.table td:first-child{padding-left:20px}.table th:last-child,.table td:last-child{padding-right:20px}
.table .r{text-align:right;font-variant-numeric:tabular-nums}
.table .cb{width:36px;padding-right:0}
.table .cb input{width:16px;height:16px;margin:0;accent-color:var(--accent)}
.table tr.bad-row td{background:#FFF7F7}
.table tr:hover td{background:#FAFBFE}.table tr.bad-row:hover td{background:#FFF1F1}
.table .ellip{max-width:380px;overflow:hidden;text-overflow:ellipsis}
.empty{padding:40px 20px;text-align:center;color:var(--muted);font-size:14px}

/* toolbar + tabs */
.toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding:14px 20px;border-bottom:1px solid var(--line)}
.tabs{display:flex;flex-wrap:wrap;align-items:flex-end;gap:2px;padding:0 8px}
.tab{height:42px;padding:0 20px;border:0;border-radius:10px 10px 0 0;font:inherit;font-size:14px;font-weight:500;color:var(--text);background:transparent;display:inline-flex;align-items:center;gap:8px;text-decoration:none;white-space:nowrap;cursor:pointer}
.tab:hover{background:rgba(255,255,255,.55);color:var(--ink)}
.tab.active{background:#fff;color:var(--ink);font-weight:700}
.tab .pill{padding:1px 8px}

/* kpis */
.kpis{display:flex;flex-wrap:wrap;gap:12px}
.kpi{flex:1 1 180px;min-width:0;background:#fff;border-radius:10px;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;text-decoration:none;color:inherit}
.kpi:hover{outline:2px solid var(--accent-bg)}
.kpi .k{font-size:13px;font-weight:600;color:var(--muted);white-space:nowrap}
.kpi .v{font-family:var(--display);font-size:22px;font-weight:800}

/* avatar */
.avatar{width:30px;height:30px;border-radius:50%;background:var(--line);display:inline-flex;overflow:hidden;flex:0 0 auto}
.avatar svg{width:100%;height:100%}
.avatar-lg{width:36px;height:36px}
.avatar-dark{background:var(--navy-line)}

/* alerts */
.alert{padding:12px 16px;border-radius:10px;font-size:14px;display:flex;gap:10px;align-items:flex-start}
.alert-success{background:var(--ok-bg);color:#14532D}.alert-error{background:var(--bad-bg);color:#7F1D1D}.alert-warn{background:var(--warn-soft);border:1px solid #FCD34D;color:#78350F}.alert-info{background:var(--accent-bg);color:#1E3A8A}
.cred{background:#0F1E3A;color:#fff;border-radius:12px;padding:16px 20px;display:flex;flex-wrap:wrap;gap:24px;align-items:center}
.cred code{font-size:18px;font-weight:700;background:rgba(255,255,255,.1);padding:4px 10px;border-radius:6px}

/* admin topbar */
.topbar{background:var(--navy);color:#fff}
.topbar .container{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;padding-top:12px;padding-bottom:12px}
.brand{display:flex;flex-direction:column;line-height:1.1;text-decoration:none;color:inherit}
.brand .n{font-family:var(--display);font-weight:800;font-size:20px;letter-spacing:-.01em}
.brand .n span{color:#9FB3E8}
.brand .s{font-size:12px;color:#8E9BB8;font-weight:500}
.topbar .nav a{color:#C9D3E8;text-decoration:none;font-size:14px;font-weight:500;padding:8px 10px;border-radius:8px}
.topbar .nav a:hover,.topbar .nav a.active{background:rgba(255,255,255,.1);color:#fff}
.topbar .user{display:flex;align-items:center;gap:10px}
.topbar .user .name{font-size:14px;font-weight:600;line-height:1.2}.topbar .user .role{font-size:12px;color:#8E9BB8}
.topbar .out{font-size:13px;font-weight:600;color:#C9D3E8;text-decoration:none;padding:8px 12px;border:1px solid var(--navy-line);border-radius:8px;background:none;font-family:inherit;cursor:pointer}
.admin-bg{background:var(--bg2);min-height:100vh;padding-bottom:48px}

/* student header */
.sheader{background:#fff;border-bottom:1px solid var(--line)}
.sheader .container-sm{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;padding-top:14px;padding-bottom:14px}
.sheader .brand .n span{color:var(--accent)}.sheader .brand .s{color:var(--muted)}
.sheader .nav{display:flex;flex-wrap:wrap;gap:20px;font-size:14px;font-weight:500}
.sheader .nav a{color:var(--text);text-decoration:none;padding-bottom:2px;border-bottom:2px solid transparent}
.sheader .nav a.active{color:var(--ink);font-weight:700;border-bottom-color:var(--accent)}
.sheader .out{font-size:13px;font-weight:600;color:var(--text);padding:8px 12px;border:1px solid #CBD3E1;border-radius:8px;background:#fff;font-family:inherit;cursor:pointer}

/* exam option rows */
.opt{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1.5px solid var(--line);background:#fff;border-radius:10px;font-size:15px;cursor:pointer;text-align:left;width:100%;font-family:inherit;color:var(--ink)}
.opt:hover{border-color:#B9C3D6;background:var(--soft2)}
.opt .k{width:30px;height:30px;border-radius:8px;background:var(--soft);color:var(--text);display:inline-flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex:0 0 30px}
.opt .t{flex:1;min-width:0;font-weight:500}
.opt .tag{font-size:12px;font-weight:700;white-space:nowrap}
.opt-sel{border-color:var(--accent);background:var(--accent-bg)}.opt-sel .k{background:var(--accent);color:#fff}
.opt-ok{border-color:var(--ok);background:var(--ok-soft)}.opt-ok .k{background:var(--ok);color:#fff}.opt-ok .tag{color:var(--ok)}
.opt-bad{border-color:var(--bad-line);background:var(--bad-soft)}.opt-bad .k{background:var(--bad);color:#fff}.opt-bad .tag{color:var(--bad)}
.opt-static{cursor:default}.opt-static:hover{border-color:var(--line);background:#fff}.opt-static.opt-ok:hover{border-color:var(--ok);background:var(--ok-soft)}.opt-static.opt-bad:hover{border-color:var(--bad-line);background:var(--bad-soft)}
.qtext{font-family:var(--display);font-size:22px;font-weight:700;line-height:1.4;white-space:pre-line}

/* question map chips */
.qmap{display:flex;flex-wrap:wrap;gap:6px}
.chip{width:38px;height:38px;border-radius:8px;border:2px solid transparent;background:var(--soft);color:var(--text);font:inherit;font-size:13px;font-weight:700;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;font-variant-numeric:tabular-nums;text-decoration:none}
.chip-ok{background:var(--ok-bg);color:var(--ok)}.chip-wrong{background:var(--bad-bg);color:var(--bad)}.chip-done{background:var(--accent-bg);color:var(--accent)}.chip-blank{background:var(--soft);color:var(--text)}
.chip.cur{border-color:var(--accent)}
.legend{display:inline-flex;gap:10px;font-size:12px;color:var(--muted)}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:5px;vertical-align:-1px}

/* video */
.video{border-radius:12px;overflow:hidden;border:1px solid var(--line);background:#000}
.video .ratio{position:relative;aspect-ratio:16/9;background:var(--navy)}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-cap{padding:10px 14px;font-size:13px;color:var(--text);background:#fff}
.video-none{padding:14px 16px;border:1px dashed #F59E0B;background:var(--warn-soft);border-radius:10px;font-size:13px;color:#78350F;line-height:1.5}

/* progress + timer */
.progress{height:6px;border-radius:999px;background:var(--line2);overflow:hidden}
.progress i{display:block;height:100%;background:var(--accent);border-radius:999px}
.timer{font-family:var(--display);font-size:22px;font-weight:800;font-variant-numeric:tabular-nums}
.timer.low{color:var(--bad)}
.score{font-family:var(--display);font-size:48px;font-weight:800;line-height:1;letter-spacing:-.02em}
.score small{color:var(--faint);font-size:28px;font-weight:800}

/* summary strip */
.strip{display:flex;flex-wrap:wrap;align-items:center;gap:24px;padding:14px 20px}
.strip .kv{font-size:14px;color:var(--text)}
.strip .kv b{color:var(--muted);font-weight:600;font-size:12px;margin-right:6px;letter-spacing:.04em}

/* landing */
.lnav{background:#fff;border-bottom:1px solid var(--line)}
.lnav .container-wide{max-width:1200px;margin:0 auto;padding:16px 32px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}
.lnav .links{display:flex;flex-wrap:wrap;gap:28px;font-size:15px;font-weight:500}.lnav .links a{color:var(--text);text-decoration:none}
.hero{position:relative;background:var(--navy);min-height:520px;display:flex;flex-direction:column;justify-content:flex-end;overflow:hidden;color:#fff}
.hero .img{position:absolute;inset:0;background-size:cover;background-position:center}
.hero .scrim{position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,30,58,.15) 0%,rgba(15,30,58,.85) 100%)}
.hero .inner{position:relative;max-width:1200px;width:100%;margin:0 auto;padding:120px 32px 64px;display:flex;flex-direction:column;gap:18px}
.hero .eyebrow{font-size:13px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:#9FB3E8}
.hero h1{font-size:52px;font-weight:800;line-height:1.1;letter-spacing:-.02em;max-width:820px}
.hero p{font-size:18px;line-height:1.6;color:#C9D3E8;max-width:640px}
.lsection{max-width:1200px;margin:0 auto;padding:72px 32px}
.lsection-white{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.eyebrow2{font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}
.lh2{font-size:36px;font-weight:800;letter-spacing:-.02em;line-height:1.15}
.feat{flex:1 1 320px;min-width:0;display:flex;gap:16px;padding:24px;border:1px solid var(--line);border-radius:14px;background:#fff}
.feat .ic{flex:0 0 44px;width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center}
.step{flex:1 1 240px;min-width:0;display:flex;flex-direction:column;gap:14px;padding:24px;border:1px solid var(--line);border-radius:14px;background:var(--soft2)}
.step .n{width:40px;height:40px;border-radius:10px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-family:var(--display);font-weight:800;font-size:17px}
.about{background:var(--navy);color:#fff}
.about .inner{max-width:1200px;margin:0 auto;padding:72px 32px;display:flex;flex-wrap:wrap;gap:48px;align-items:center}
.about .photo{width:240px;height:280px;border-radius:18px;background:var(--navy2);border:1px dashed #4B5E86;display:flex;align-items:center;justify-content:center;color:#B7C2DA;font-size:13px;font-weight:600;object-fit:cover}
.lfooter{max-width:1200px;margin:0 auto;padding:28px 32px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;font-size:13px;color:var(--muted)}
.lfooter a{color:var(--muted);text-decoration:none}
.login-card{flex:1 1 360px;min-width:0;max-width:460px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:32px;display:flex;flex-direction:column;gap:16px;box-shadow:0 10px 30px rgba(15,30,58,.06)}

/* pagination */
.pagination{display:flex;gap:6px;list-style:none;margin:0;padding:0;flex-wrap:wrap}
.pagination a,.pagination span{display:inline-flex;align-items:center;justify-content:center;min-width:32px;height:32px;padding:0 10px;border:1px solid #CBD3E1;border-radius:8px;background:#fff;color:var(--text);font-size:13px;text-decoration:none}
.pagination .active span{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:700}
.pagination .disabled span{opacity:.45}

/* dropdown menu */
details.menu{position:relative}
details.menu summary{list-style:none;cursor:pointer}
details.menu summary::-webkit-details-marker{display:none}
details.menu .dd{position:absolute;right:0;top:calc(100% + 6px);min-width:220px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 10px 30px rgba(15,30,58,.12);padding:6px;z-index:20;display:flex;flex-direction:column}
details.menu .dd a,details.menu .dd button{display:block;width:100%;text-align:left;padding:9px 12px;border:0;background:none;font:inherit;font-size:13px;font-weight:600;color:var(--ink);border-radius:8px;cursor:pointer;text-decoration:none}
details.menu .dd a:hover,details.menu .dd button:hover{background:var(--soft)}
details.menu .dd .danger{color:var(--bad)}

@media (max-width:720px){
  .container,.container-sm{padding:0 14px}
  .hero h1{font-size:34px}.hero .inner{padding:80px 20px 40px}
  .lsection{padding:48px 20px}.lh2{font-size:28px}
  .score{font-size:40px}
  .card-c{padding:16px}
}
@media print{.noprint{display:none!important}}