:root{
  --bg:#f1f5f9; --card:#ffffff; --ink:#0f172a; --muted:#64748b;
  --primary:#6D28D9; --line:#e2e8f0; --ok:#16a34a; --bad:#dc2626;
}
*{box-sizing:border-box}
body{
  margin:0; font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  background:var(--bg); color:var(--ink); line-height:1.5;
}
a{color:var(--primary); text-decoration:none}
.topbar{
  display:flex; justify-content:space-between; align-items:center;
  padding:12px 16px; background:#0f172a; color:#fff; position:sticky; top:0; z-index:50;
}
.brand{font-weight:700; font-size:18px; color:#fff; display:inline-flex; align-items:center; gap:8px}
.brand-logo{width:9px; height:9px; border-radius:3px; display:block}
.page-logo{width:12px; height:12px; border-radius:4px; display:block; margin:0 auto 6px}
.nav{display:flex; align-items:center; gap:14px; flex-wrap:wrap}
.nav a{color:#cbd5e1}
.nav .who{color:#94a3b8; font-size:14px}
.container{max-width:960px; margin:0 auto; padding:20px 16px 60px}
.foot{text-align:center; color:var(--muted); font-size:13px; padding:24px; display:flex; gap:14px; justify-content:center; align-items:center; flex-wrap:wrap}
.foot a{color:var(--primary)}

/* buttons */
.btn-primary,.btn-ghost{
  display:inline-block; padding:10px 16px; border-radius:10px; font-weight:600;
  border:1px solid transparent; cursor:pointer; font-size:15px;
}
.btn-primary{background:var(--primary); color:#fff}
.btn-primary:hover{background:#1d4ed8}
.btn-ghost{background:#fff; border-color:var(--line); color:var(--ink)}
.btn-ghost:hover{border-color:var(--primary); color:var(--primary)}
.full{width:100%; text-align:center}
.center{text-align:center}
.start-card{text-align:center}
.size-grid{display:grid; grid-template-columns:1fr 1fr; gap:12px; margin:18px 0}
.size-btn{font-size:20px; font-weight:700; padding:18px 0; border:1px solid var(--line); background:var(--bg); color:var(--ink); border-radius:12px; cursor:pointer; transition:.15s}
.size-btn:hover{border-color:var(--primary); background:var(--primary); color:#fff}

/* alerts */
.alert{padding:10px 14px; border-radius:10px; margin:10px 0; font-size:14px}
.alert-success{background:#dcfce7; color:#166534}
.alert-danger{background:#fee2e2; color:#991b1b}
.alert-warning{background:#fef9c3; color:#854d0e}

/* hero */
.hero{text-align:center; padding:30px 10px}
.hero h1{font-size:34px; margin:0 0 8px}
.lead{color:var(--muted); max-width:640px; margin:0 auto 18px}
.hero-actions{display:flex; gap:12px; justify-content:center; flex-wrap:wrap}
.features{display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:14px; margin-top:24px}
.card{background:var(--card); border:1px solid var(--line); border-radius:14px; padding:18px}

/* auth */
.auth-wrap{display:flex; justify-content:center; padding:30px 0}
.auth-card{background:var(--card); border:1px solid var(--line); border-radius:16px; padding:24px; width:100%; max-width:420px}
.auth-card h2{margin-top:0}
label{display:block; font-size:14px; color:var(--muted); margin:12px 0 4px}
input[type=text],input[type=email],input[type=password],input[type=number],textarea,input[type=file]{
  width:100%; padding:10px 12px; border:1px solid var(--line); border-radius:10px; font-size:15px; background:#fff; color:var(--ink);
}
textarea{resize:vertical}
.two-col{display:grid; grid-template-columns:1fr 1fr; gap:12px}
.check{display:flex; align-items:center; gap:8px; color:var(--ink)!important}
.muted{color:var(--muted)}
.page-title{font-size:26px; margin:6px 0 18px}
.group-title{font-size:20px; margin:24px 0 10px; padding-bottom:6px; border-bottom:2px solid var(--line)}

/* exam catalog */
.exam-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(260px,1fr)); gap:16px}
.exam-tile{
  background:var(--card); border:1px solid var(--line); border-top:4px solid var(--accent,#6D28D9);
  border-radius:14px; padding:18px; display:flex; flex-direction:column; gap:8px; transition:.15s;
}
.exam-tile:hover{transform:translateY(-3px); box-shadow:0 8px 20px rgba(0,0,0,.08)}
.exam-tile h3{margin:6px 0 0}
.badge{background:color-mix(in srgb,var(--accent) 15%,#fff); color:var(--accent); padding:3px 10px; border-radius:999px; font-size:12px; font-weight:600}
.exam-meta{display:flex; gap:12px; font-size:13px; color:var(--muted); flex-wrap:wrap}
.start-btn{margin-top:auto; color:var(--accent); font-weight:700}

/* exam taking */
.exam-head{display:flex; justify-content:space-between; align-items:center; gap:12px; margin-bottom:14px; flex-wrap:wrap}
.progress-pill{background:var(--accent); color:#fff; padding:6px 14px; border-radius:999px; font-weight:700; font-size:14px}
.q-card{background:var(--card); border:1px solid var(--line); border-radius:16px; padding:20px; margin-bottom:16px}
.q-num{font-weight:700; color:var(--muted); font-size:14px; margin-bottom:6px}
.type-tag{background:#e0e7ff; color:#3730a3; padding:2px 8px; border-radius:6px; font-size:12px; margin-left:6px}
.q-text{font-size:17px; font-weight:600; margin:6px 0 14px}
.options{display:flex; flex-direction:column; gap:10px}
.opt{display:flex; align-items:center; gap:10px; border:1px solid var(--line); border-radius:10px; padding:12px; cursor:pointer; font-size:15px}
.opt:hover{border-color:var(--accent)}
.opt input{width:18px; height:18px}
.feedback{margin-top:14px; padding:12px 14px; border-radius:10px; font-size:14px; white-space:pre-wrap}
.feedback.ok{background:#dcfce7; color:#166534}
.feedback.bad{background:#fee2e2; color:#991b1b}
.q-nav{display:flex; gap:10px; margin-top:16px; flex-wrap:wrap}
.q-nav .btn-primary{margin-left:auto}

/* result */
.result-card{background:var(--card); border:1px solid var(--line); border-radius:18px; padding:30px; text-align:center; max-width:520px; margin:20px auto}
.result-card.pass{border-top:6px solid var(--ok)}
.result-card.fail{border-top:6px solid var(--bad)}
.result-badge{font-size:20px; font-weight:800}
.score-big{font-size:52px; font-weight:800; margin:8px 0}
.cert-actions{display:flex; gap:10px; justify-content:center; flex-wrap:wrap; margin:16px 0}

/* tables */
.tbl{width:100%; border-collapse:collapse; background:var(--card); border-radius:12px; overflow:hidden; margin-bottom:24px}
.tbl th,.tbl td{padding:10px 12px; text-align:left; border-bottom:1px solid var(--line); font-size:14px}
.tbl th{background:#f8fafc; color:var(--muted); font-weight:600}
.tbl .ua{max-width:320px; word-break:break-all; font-size:12px; color:var(--muted)}
.tag{display:inline-block; padding:2px 8px; border-radius:999px; font-size:12px; font-weight:600; background:#eef2ff; color:#4338ca}
.tag-login,.tag-logout{background:#ecfdf5; color:#047857}
.tag-account_created,.tag-password_changed,.tag-password_reset{background:#fff7ed; color:#c2410c}
.tag-exam_start{background:#eff6ff; color:#1d4ed8}
.tag-exam_finished{background:#faf5ff; color:#7e22ce}
.row-actions{display:flex; gap:8px; align-items:center; flex-wrap:wrap}
.row-actions form{margin:0}
.row-actions button,.link-danger{background:none; border:none; color:var(--primary); cursor:pointer; font-size:14px; padding:0}
.link-danger{color:var(--bad)}
.page-head{display:flex; justify-content:space-between; align-items:center; gap:12px; flex-wrap:wrap}
.stat-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(130px,1fr)); gap:12px; margin-bottom:24px}
.stat{background:var(--card); border:1px solid var(--line); border-radius:14px; padding:18px; text-align:center}
.stat .num{display:block; font-size:28px; font-weight:800}
.stat .lbl{color:var(--muted); font-size:13px}
.admin-links{display:flex; gap:12px; flex-wrap:wrap}
.code{background:#0f172a; color:#e2e8f0; padding:14px; border-radius:10px; overflow:auto; font-size:13px}
.activity-list{list-style:none; padding:0; margin:0}
.activity-row{display:flex; align-items:flex-start; gap:12px; background:var(--card); border:1px solid var(--line); border-radius:12px; padding:12px 14px; margin-bottom:10px}
.activity-icon{font-size:20px; line-height:1.2}
.activity-body{flex:1; min-width:0}
.activity-title{font-weight:600}
.activity-detail{font-size:13px; color:var(--muted); word-break:break-word}
.activity-time{font-size:12px; color:var(--muted); white-space:nowrap}
.consent-box{background:var(--card); border:1px solid var(--line); border-radius:14px; padding:18px; margin:14px 0}
.consent-box.granted{border-left:4px solid var(--ok)}
.consent-box.none{border-left:4px solid var(--bad)}
.consent-meta{font-size:13px; color:var(--muted)}
.privacy-doc{max-width:820px; line-height:1.6}
.privacy-doc h2{margin-top:22px}
.privacy-doc ul{margin:8px 0 8px 18px}