*{margin:0;padding:0;box-sizing:border-box}
:root{--p:#4a2b7a;--p2:#667eea;--p3:#764ba2;--ok:#16a34a;--bad:#dc2626;--mut:#6b7280;--bg:#f3f4f8}
body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;background:var(--bg);color:#1f2937;min-height:100vh;display:flex;flex-direction:column;line-height:1.5}
a{color:var(--p)}
.topbar{background:linear-gradient(135deg,var(--p2),var(--p3));color:#fff}
.topbar-inner{max-width:1100px;margin:0 auto;padding:14px 20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px}
.brand{color:#fff;text-decoration:none;font-weight:700;font-size:1.2rem}
nav{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
nav a,.linkbtn{color:#fff;text-decoration:none;padding:7px 14px;border-radius:30px;font-size:.92rem;background:none;border:none;cursor:pointer;font-family:inherit}
nav a:hover,.linkbtn:hover{background:rgba(255,255,255,.18)}
nav a.on{background:rgba(255,255,255,.25);font-weight:600}
form.inline{display:inline}
.wrap{flex:1;width:100%;max-width:1100px;margin:0 auto;padding:28px 20px}
.foot{text-align:center;color:var(--mut);font-size:.82rem;padding:20px}
.card{background:#fff;border-radius:16px;padding:28px;box-shadow:0 4px 18px rgba(0,0,0,.07);margin-bottom:22px}
.card.narrow{max-width:520px;margin-left:auto;margin-right:auto}
h1{font-size:1.7rem;margin-bottom:6px;color:#111827}
h2{font-size:1.25rem;margin-bottom:12px;color:#111827}
.sub{color:var(--mut);margin-bottom:20px}
label{display:block;font-weight:600;font-size:.9rem;margin:14px 0 5px}
input[type=text],input[type=email],input[type=tel],input[type=password],select{width:100%;padding:11px 13px;border:1px solid #d1d5db;border-radius:10px;font-size:1rem;font-family:inherit;background:#fff}
input:focus,select:focus{outline:2px solid var(--p2);border-color:var(--p2)}
input[readonly]{background:#f3f4f6;color:#6b7280}
.row{display:grid;grid-template-columns:130px 1fr;gap:14px}
.hint{font-size:.8rem;color:var(--mut);margin-top:4px}
.btn{display:inline-block;padding:12px 26px;border:none;border-radius:40px;font-size:.98rem;font-weight:600;cursor:pointer;text-decoration:none;font-family:inherit;transition:.15s}
.btn:hover{transform:translateY(-2px)}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}
.btn-primary{background:var(--p);color:#fff}
.btn-primary:hover{background:#5d3a9e}
.btn-ok{background:var(--ok);color:#fff}
.btn-grey{background:#6b7280;color:#fff}
.btn-out{background:#fff;color:var(--p);border:2px solid var(--p)}
.btn-block{width:100%;margin-top:22px}
.alert{padding:12px 16px;border-radius:10px;margin-bottom:18px;font-size:.95rem}
.alert-error{background:#fee2e2;color:#991b1b}
.alert-success{background:#dcfce7;color:#166534}
.alert-info{background:#e0e7ff;color:#3730a3}
.alert ul{margin-left:18px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.tile{background:#fff;border-radius:16px;padding:26px;box-shadow:0 4px 18px rgba(0,0,0,.07);text-decoration:none;color:inherit;display:block;transition:.2s;border-top:5px solid var(--p2)}
.tile:hover{transform:translateY(-4px);box-shadow:0 10px 26px rgba(0,0,0,.12)}
.tile .ico{font-size:2rem}
.tile h3{margin:8px 0 4px;color:var(--p)}
.tile p{color:var(--mut);font-size:.9rem}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin-bottom:22px}
.stat{background:#fff;border-radius:14px;padding:16px;text-align:center;box-shadow:0 4px 14px rgba(0,0,0,.06)}
.stat b{display:block;font-size:1.7rem;color:var(--p)}
.stat span{font-size:.82rem;color:var(--mut)}
.hero{background:linear-gradient(135deg,var(--p2),var(--p3));color:#fff;border-radius:20px;padding:50px 30px;text-align:center;margin-bottom:26px}
.hero h1{color:#fff;font-size:2.2rem}
.hero p{opacity:.92;max-width:600px;margin:12px auto 26px}
.hero .btn{margin:5px}
table{width:100%;border-collapse:collapse;font-size:.95rem}
th,td{padding:12px 10px;text-align:left;border-bottom:1px solid #e5e7eb}
th{font-size:.8rem;text-transform:uppercase;letter-spacing:.04em;color:var(--mut)}
.tag{display:inline-block;padding:3px 12px;border-radius:20px;font-size:.8rem;font-weight:700}
.tag.pass{background:#dcfce7;color:#166534}
.tag.fail{background:#fee2e2;color:#991b1b}
.code-input{text-align:center;font-size:2rem!important;letter-spacing:12px;font-weight:700}
.score-circle{width:150px;height:150px;border-radius:50%;background:linear-gradient(135deg,var(--p2),var(--p3));color:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 14px}
.score-circle b{font-size:2.6rem;line-height:1}
.center{text-align:center}
.divider{height:1px;background:#e5e7eb;margin:26px 0}
/* test runner */
.t-bar{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.t-timer{font-family:monospace;font-size:1.3rem;font-weight:700;color:var(--bad);background:#fff;padding:6px 18px;border-radius:30px}
.t-prog{flex:1;min-width:160px;height:10px;background:#e5e7eb;border-radius:20px;overflow:hidden}
.t-prog div{height:100%;width:0;background:linear-gradient(90deg,#16a34a,#84cc16);transition:width .3s}
.q-topic{display:inline-block;background:var(--p);color:#fff;padding:4px 14px;border-radius:30px;font-size:.78rem;margin-bottom:10px}
.q-text{font-size:1.2rem;font-weight:600;background:#f8f9ff;border-left:5px solid var(--p);padding:18px;border-radius:12px;margin-bottom:16px}
.opt{display:flex;gap:12px;align-items:center;padding:13px 16px;margin:10px 0;border:1px solid #e5e7eb;background:#f9fafb;border-radius:12px;cursor:pointer;transition:.15s;width:100%;text-align:left;font-size:1rem;font-family:inherit}
.opt:hover{border-color:var(--p);background:#f1ecfa}
.opt.sel{background:var(--p);color:#fff;border-color:var(--p)}
.opt .l{min-width:32px;height:32px;border-radius:30px;background:rgba(0,0,0,.08);display:inline-flex;align-items:center;justify-content:center;font-weight:800}
.opt.sel .l{background:rgba(255,255,255,.25)}
.opt.right{background:#dcfce7;border-color:#16a34a;color:#14532d;cursor:default}
.opt.wrong{background:#fee2e2;border-color:#dc2626;color:#7f1d1d;cursor:default}
.t-nav{display:flex;justify-content:space-between;gap:10px;margin-top:20px;flex-wrap:wrap}
.pal{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.pal button{width:42px;height:42px;border-radius:10px;border:2px solid transparent;background:#d1d5db;color:#fff;font-weight:700;cursor:pointer;font-family:inherit}
.pal button.ans{background:var(--ok)}
.pal button.cur{border-color:#f59e0b}
.pal.res button{cursor:default}
.pal.res .ok{background:var(--ok)}
.pal.res .no{background:var(--bad)}
.pal.res .na{background:#9ca3af}
.rev{border:1px solid #e5e7eb;border-radius:14px;padding:18px;margin-bottom:16px}
.rev h4{margin-bottom:8px}
@media(max-width:640px){.row{grid-template-columns:1fr}.hero h1{font-size:1.6rem}.card{padding:20px}table{font-size:.85rem}.t-nav .btn{flex:1}}
/* admin */
.subnav{display:flex;gap:8px;margin-bottom:22px;flex-wrap:wrap}
.subnav a{padding:8px 18px;border-radius:30px;background:#fff;color:var(--p);text-decoration:none;font-weight:600;font-size:.92rem;box-shadow:0 2px 8px rgba(0,0,0,.06)}
.subnav a.on{background:var(--p);color:#fff}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:16px}
.toolbar input[type=text],.toolbar select{width:auto;flex:1;min-width:180px}
.pager{display:flex;gap:16px;justify-content:center;align-items:center;margin-top:16px;color:var(--mut)}
.btn-sm{padding:6px 14px;font-size:.82rem}
.btn-danger{background:var(--bad);color:#fff}
.tag.grey{background:#e5e7eb;color:#374151}
.tag.purple{background:#ede9fe;color:#5b21b6}
.tag.amber{background:#fef3c7;color:#92400e}
textarea{width:100%;padding:11px 13px;border:1px solid #d1d5db;border-radius:10px;font-size:.92rem;font-family:ui-monospace,Menlo,Consolas,monospace;min-height:140px}
.actions{white-space:nowrap}
.actions form{display:inline}
.check{display:flex;align-items:center;gap:8px;margin:14px 0 0;font-weight:600}
.check input{width:auto}
.qopt{display:grid;grid-template-columns:90px 1fr;gap:10px;align-items:center}
.qopt span{font-size:.82rem;font-weight:700;color:var(--mut)}