:root{
  --bg:#f4f6fb;
  --card:#ffffff;
  --text:#182033;
  --muted:#66708a;
  --primary:#084a8c;
  --primary-dark:#063865;
  --success:#1a9e5c;
  --danger:#d0242a;
  --warning:#e2a53a;
  --border:#e3e8f0;
  --ring-bg:#e3e8f0;
  --radius:16px;
  --shadow:0 2px 10px rgba(20,30,60,.06), 0 1px 2px rgba(20,30,60,.05);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0f1420;
    --card:#171e2e;
    --text:#eef1f7;
    --muted:#9aa4bd;
    --border:#2a3348;
    --ring-bg:#2a3348;
    --shadow:0 2px 14px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"]{
  --bg:#0f1420;
  --card:#171e2e;
  --text:#eef1f7;
  --muted:#9aa4bd;
  --border:#2a3348;
  --ring-bg:#2a3348;
  --shadow:0 2px 14px rgba(0,0,0,.35);
}
:root{
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-display: "Manrope", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--bg); color:var(--text);
  font-family:var(--font-body);
  font-size:15.5px;
  -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale;
  min-height:100vh;
}
button{font-family:inherit; cursor:pointer;}
h1,h2,h3,
.brand-title, .hero-stat .big, .score-circle span, .action-card h3,
.q-text, .pass-banner, .qtimer span{
  font-family:var(--font-display);
  letter-spacing:-.01em;
}
.hero-stat .big, .score-circle span, .qtimer span{font-variant-numeric:tabular-nums;}

.topbar{
  display:flex; align-items:center; justify-content:space-between;
  padding:12px 24px; background:var(--card); border-bottom:1px solid var(--border);
  position:sticky; top:0; z-index:10; flex-wrap:wrap; gap:10px;
}
.brand{display:flex; align-items:center; gap:10px; cursor:pointer;}
.brand-badge{
  width:36px; height:36px; border-radius:10px; flex:0 0 auto;
  display:flex; align-items:center; justify-content:center;
  background:linear-gradient(135deg, var(--primary), var(--primary-dark));
}
.brand-title{font-weight:800; font-size:16px; line-height:1.1; font-family:var(--font-display);}
.brand-sub{font-size:12px; color:var(--muted);}
.mainnav{display:flex; gap:4px; flex-wrap:wrap;}
.navbtn{
  border:none; background:transparent; color:var(--muted); font-weight:600;
  padding:9px 14px; border-radius:10px; font-size:14px; transition:.15s;
}
.navbtn:hover{background:var(--bg);}
.navbtn.active{background:var(--primary); color:#fff;}

.theme-toggle{
  border:1px solid var(--border); background:var(--bg); color:var(--text);
  width:36px; height:36px; border-radius:10px; flex:0 0 auto;
  display:flex; align-items:center; justify-content:center; transition:.15s;
}
.theme-toggle:hover{border-color:var(--primary); color:var(--primary);}
.theme-toggle .icon-sun{display:none;}
.theme-toggle .icon-moon{display:block;}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) .theme-toggle .icon-sun{display:block;}
  :root:not([data-theme="light"]) .theme-toggle .icon-moon{display:none;}
}
:root[data-theme="dark"] .theme-toggle .icon-sun{display:block;}
:root[data-theme="dark"] .theme-toggle .icon-moon{display:none;}

.app-main{max-width:900px; margin:0 auto; padding:22px 18px 60px;}
.foot{text-align:center; color:var(--muted); font-size:12px; padding:20px;}
.foot p{margin:0 0 6px;}
.foot p:last-child{margin-bottom:0;}
.foot > p:first-child{opacity:.8;}
.footer-support-link{
  display:inline-flex; align-items:center; justify-content:center; gap:8px; min-height:44px;
  color:var(--primary); background:var(--card); border:1px solid var(--border); border-radius:999px;
  padding:8px 13px; font-size:12.5px; font-weight:700; text-decoration:none; opacity:1;
  transition:transform .15s, border-color .15s, box-shadow .15s;
}
.footer-support-link:hover{transform:translateY(-1px); border-color:var(--primary); box-shadow:var(--shadow);}
.footer-support-link > svg{width:17px; height:17px; flex:0 0 auto;}
.footer-support-provider{display:inline-flex; align-items:center; gap:4px; color:var(--muted); font-weight:600;}
.footer-support-provider svg{width:13px; height:13px;}

/* HOME */
.hero{
  background:linear-gradient(135deg, var(--primary), var(--primary-dark));
  color:#fff; border-radius:20px; padding:30px 26px; margin-bottom:22px;
  box-shadow:var(--shadow);
}
.hero h1{margin:0 0 8px; font-size:26px;}
.hero p{margin:0 0 18px; opacity:.92;}
.hero-stats{display:flex; gap:26px; flex-wrap:wrap;}
.hero .hero-stats{border-top:1px solid rgba(255,255,255,.25); padding-top:16px;}
.hero-stat{display:flex; flex-direction:column;}
.hero-stat .big{font-size:26px; font-weight:800;}
.hero-stat span:last-child{font-size:12.5px; opacity:.85;}
.setup-card .hero-stats .hero-stat .big{color:var(--primary);}
.setup-card .hero-stats .hero-stat span:last-child{color:var(--muted);}

.cards-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:16px;}
@media (max-width:640px){ .cards-grid{grid-template-columns:1fr;} }
.action-card{
  background:var(--card); border:1px solid var(--border); border-radius:var(--radius);
  padding:20px; box-shadow:var(--shadow); transition:.15s; cursor:pointer;
}
.action-card:hover{transform:translateY(-2px); border-color:var(--primary);}
.ac-icon{width:44px; height:44px; border-radius:12px; display:flex; align-items:center; justify-content:center; margin-bottom:10px;}
.ac-icon svg{width:23px; height:23px;}
.action-card h3{margin:0 0 6px; font-size:17px;}
.action-card p{margin:0; color:var(--muted); font-size:13.5px; line-height:1.4;}
.badge{background:var(--warning); color:#fff; border-radius:999px; padding:2px 8px; font-size:11.5px; font-weight:700;}

.official-reference{
  display:flex; align-items:center; justify-content:space-between; gap:22px;
  margin-top:18px; padding:20px 22px; background:var(--card);
  border:1px solid var(--border); border-left:4px solid var(--primary);
  border-radius:var(--radius); box-shadow:var(--shadow);
}
.official-reference-copy{min-width:0;}
.official-kicker{
  display:block; margin-bottom:4px; color:var(--primary); font-size:11px;
  font-weight:800; letter-spacing:.08em; text-transform:uppercase;
}
.official-reference h2{margin:0 0 6px; font-size:18px;}
.official-reference p{margin:0; color:var(--muted); font-size:13.5px; line-height:1.5;}
.official-reference .official-disclaimer{margin-top:5px; font-size:12px;}
.official-link{
  display:inline-flex; align-items:center; justify-content:center; gap:8px; flex:0 0 auto;
  min-height:46px; padding:10px 15px; color:var(--primary); background:var(--bg);
  border:1px solid var(--primary); border-radius:12px; font-size:13.5px;
  font-weight:800; text-decoration:none; transition:background .15s, color .15s, transform .15s;
}
.official-link:hover{background:var(--primary); color:#fff; transform:translateY(-1px);}
.official-link:focus-visible{outline:3px solid var(--warning); outline-offset:3px;}
.official-link svg{width:16px; height:16px; flex:0 0 auto;}
.faq-item a{color:var(--primary); font-weight:700;}

@media (max-width:680px){
  .official-reference{align-items:flex-start; flex-direction:column; padding:18px;}
  .official-link{width:100%;}
}

/* FAQ */
.faq-section{margin-top:28px;}
.faq-section h2{font-size:20px; margin:0 0 14px;}
.faq-item{
  background:var(--card); border:1px solid var(--border); border-radius:12px;
  padding:14px 16px; margin-bottom:10px;
}
.faq-item summary{font-weight:700; cursor:pointer; font-size:14.5px; list-style:none;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::before{content:"+"; display:inline-block; width:18px; color:var(--primary); font-weight:800;}
.faq-item[open] summary::before{content:"–";}
.faq-item p{margin:10px 0 0 18px; color:var(--muted); font-size:13.5px; line-height:1.5;}

/* SETUP */
.setup-card{
  background:var(--card); border:1px solid var(--border); border-radius:var(--radius);
  padding:24px; box-shadow:var(--shadow);
}
.backlink{
  border:none; background:none; color:var(--primary); font-weight:600; font-size:14px;
  padding:0; margin-bottom:14px; display:inline-block;
}
.setup-card h2{margin:0 0 6px;}
.muted{color:var(--muted); font-size:14px; line-height:1.5;}
.field{margin:20px 0;}
.field label{display:block; font-weight:700; font-size:13.5px; margin-bottom:8px;}
.chip-group{display:flex; gap:8px; flex-wrap:wrap;}
.chip{
  border:1px solid var(--border); background:var(--bg); color:var(--text);
  padding:8px 14px; border-radius:999px; font-size:13.5px; font-weight:600; transition:.15s;
}
.chip.active{background:var(--primary); border-color:var(--primary); color:#fff;}

.cat-switcher{display:flex; align-items:center; gap:10px; flex-wrap:wrap; margin-bottom:16px;}
.cat-switcher-label{font-size:13px; font-weight:700; color:var(--muted);}
.btn-primary{
  background:var(--primary); color:#fff; border:none; border-radius:12px;
  padding:11px 18px; font-weight:700; font-size:14.5px;
}
.btn-primary:hover{background:var(--primary-dark);}
.btn-lg{width:100%; padding:14px; font-size:16px; margin-top:8px;}
.btn-ghost{
  background:var(--bg); color:var(--text); border:1px solid var(--border);
  border-radius:12px; padding:11px 16px; font-weight:600; font-size:14px;
}
.btn-ghost:disabled{opacity:.4; cursor:not-allowed;}
.btn-danger{background:var(--danger); color:#fff; border:none; border-radius:12px; padding:11px 16px; font-weight:700;}
.danger-link{color:var(--danger); border-color:var(--danger); margin-top:24px;}
.empty-note{color:var(--muted); font-style:italic; padding:14px 0;}

/* RUNNING */
.run-header{display:flex; align-items:center; gap:16px; margin-bottom:16px; flex-wrap:wrap;}
.run-header .backlink{margin:0;}
.progress-wrap{flex:1; min-width:160px;}
.progress-label{font-size:12.5px; color:var(--muted); font-weight:700; margin-bottom:5px;}
.progress-bar{background:var(--ring-bg); height:8px; border-radius:999px; overflow:hidden;}
.progress-fill{background:var(--primary); height:100%; transition:width .2s;}
.qtimer{
  width:52px; height:52px; border-radius:50%; display:flex; align-items:center; justify-content:center;
  position:relative;
}
.qtimer::before{content:""; position:absolute; inset:5px; background:var(--card); border-radius:50%;}
.qtimer span{position:relative; font-weight:800; font-size:13px; z-index:1;}

.q-card{
  background:var(--card); border:1px solid var(--border); border-radius:var(--radius);
  padding:24px; box-shadow:var(--shadow); margin-bottom:16px;
}
.sign-box{display:flex; flex-direction:column; align-items:center; gap:6px; margin-bottom:16px;}
.sign-code{font-size:12px; color:var(--muted); font-weight:700; letter-spacing:.03em;}
.sign-fallback{padding:14px; background:var(--bg); border-radius:10px; font-weight:700;}
.sign-img{
  display:block; max-width:100%; width:auto; background:#fff; padding:10px;
  border-radius:12px; border:1px solid var(--border); box-shadow:var(--shadow);
}
.diagram-img{padding:6px; height:auto;}
.q-text{margin:0 0 18px; font-size:18px; line-height:1.4;}
.options{display:flex; flex-direction:column; gap:10px;}
.opt-btn{
  display:flex; align-items:center; gap:12px; text-align:left;
  border:2px solid var(--border); background:var(--bg); border-radius:12px;
  padding:12px 14px; font-size:14.5px; line-height:1.4; transition:.12s;
  color:var(--text); opacity:1;
}
.opt-btn:hover:not(:disabled){border-color:var(--primary);}
.opt-btn:disabled{cursor:default; opacity:1; -webkit-text-fill-color:var(--text);}
.opt-btn.dim{opacity:.55;}
.opt-letter{
  flex:0 0 auto; width:28px; height:28px; border-radius:8px; background:var(--card);
  border:1px solid var(--border); display:flex; align-items:center; justify-content:center;
  font-weight:800; font-size:13px;
}
.opt-btn.selected{border-color:var(--primary); background:rgba(10,95,176,.08);}
.opt-btn.correct{border-color:var(--success); background:rgba(26,158,92,.12);}
.opt-btn.correct .opt-letter{background:var(--success); color:#fff; border-color:var(--success);}
.opt-btn.wrong{border-color:var(--danger); background:rgba(208,36,42,.1);}
.opt-btn.wrong .opt-letter{background:var(--danger); color:#fff; border-color:var(--danger);}

.options.img-options{display:grid; grid-template-columns:1fr 1fr; gap:10px;}
.options.img-options .opt-btn{flex-direction:column; text-align:center; padding:10px;}
.opt-thumb{max-width:100%; max-height:110px; object-fit:contain; border-radius:6px; background:#fff;}
.correct-note .opt-thumb{max-height:80px; margin-top:6px; display:block;}

.feedback{margin-top:16px; padding:12px 14px; border-radius:12px; font-weight:700; font-size:14.5px; display:flex; align-items:center; flex-wrap:wrap; gap:0;}
.feedback-icon{display:inline-flex; margin-right:8px; flex:0 0 auto;}
.pass-banner{display:flex; align-items:center; justify-content:center; gap:8px;}
.pass-banner .feedback-icon{margin-right:0;}
.feedback.ok{background:rgba(26,158,92,.12); color:var(--success);}
.feedback.bad{background:rgba(208,36,42,.1); color:var(--danger);}
.correct-note{flex-basis:100%; margin-top:6px; font-weight:500; color:var(--text); font-size:13.5px;}

.run-footer{display:flex; justify-content:flex-end; align-items:center; gap:10px;}
.exam-footer{justify-content:space-between; flex-wrap:wrap;}

.nav-grid{display:flex; flex-wrap:wrap; gap:6px; margin-bottom:16px;}
.navdot{
  width:30px; height:30px; border-radius:8px; border:1px solid var(--border); background:var(--card);
  font-size:12px; font-weight:700; color:var(--muted);
}
.navdot.answered{background:var(--primary); color:#fff; border-color:var(--primary);}
.navdot.current{outline:2px solid var(--warning); outline-offset:1px;}

/* RESULTS */
.results-card{
  background:var(--card); border:1px solid var(--border); border-radius:var(--radius);
  padding:30px; text-align:center; box-shadow:var(--shadow); margin-bottom:20px;
}
.pass-banner{font-size:22px; font-weight:800; margin-bottom:14px;}
.results-card.pass .pass-banner{color:var(--success);}
.results-card.fail .pass-banner{color:var(--danger);}
.score-circle{
  width:130px; height:130px; border-radius:50%; margin:0 auto 14px; display:flex; align-items:center; justify-content:center;
  position:relative;
}
.score-circle::before{content:""; position:absolute; inset:10px; background:var(--card); border-radius:50%;}
.score-circle span{position:relative; font-size:26px; font-weight:800; z-index:1;}
.results-actions{display:flex; gap:10px; justify-content:center; flex-wrap:wrap; margin-top:16px;}

.resume-banner{
  display:flex; align-items:center; justify-content:space-between; gap:16px; flex-wrap:wrap;
  background:var(--card); border:1px solid var(--border); border-left:4px solid var(--warning);
  border-radius:var(--radius); padding:16px 20px; margin-bottom:16px;
}
.resume-info strong{display:block; font-size:14.5px;}
.resume-info p{margin:2px 0 0;}
.resume-actions{display:flex; gap:10px; flex-wrap:wrap;}

.support-banner{
  position:relative; isolation:isolate; overflow:hidden;
  display:grid; grid-template-columns:52px minmax(0, 1fr) auto; align-items:center; gap:18px;
  background:
    radial-gradient(circle at 104% -30%, rgba(8,74,140,.1) 0 90px, transparent 91px),
    linear-gradient(135deg, #f2f7ff 0%, #fff 62%, #f7f3ff 100%);
  border:1px solid #cdddf0; border-radius:var(--radius);
  padding:22px; text-align:left; margin-bottom:20px; box-shadow:var(--shadow);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) .support-banner{
    background:
      radial-gradient(circle at 104% -30%, rgba(143,197,255,.09) 0 90px, transparent 91px),
      linear-gradient(135deg, #16243a 0%, #171e2e 62%, #231d32 100%);
    border-color:#35445e;
  }
  :root:not([data-theme="light"]) .support-eyebrow,
  :root:not([data-theme="light"]) .footer-support-link{color:#8fc5ff;}
  :root:not([data-theme="light"]) .support-icon{color:#8fc5ff; background:rgba(143,197,255,.1); border-color:rgba(143,197,255,.2);}
}
.support-icon{
  width:52px; height:52px; border-radius:15px; display:flex; align-items:center; justify-content:center;
  color:var(--primary); background:rgba(8,74,140,.1); border:1px solid rgba(8,74,140,.14);
}
.support-icon svg{width:25px; height:25px;}
.support-copy{min-width:0;}
.support-eyebrow{
  display:block; margin-bottom:4px; color:var(--primary); font-size:11px; font-weight:800;
  letter-spacing:.08em; text-transform:uppercase;
}
.support-banner h3{margin:0 0 5px; font-size:18px; font-family:var(--font-display);}
.support-banner p{margin:0; max-width:520px; color:var(--muted); font-size:13.5px; line-height:1.5;}
.support-banner .support-meta{margin-top:7px; font-size:11.5px;}
.support-actions{display:flex; flex-direction:column; align-items:stretch; gap:6px; min-width:214px;}
.support-cta{
  display:flex; align-items:center; justify-content:center; gap:8px; min-height:48px;
  background:var(--primary); color:#fff; border:1px solid var(--primary); border-radius:12px;
  padding:11px 15px; font-weight:800; font-size:14px; line-height:1.2; text-decoration:none;
  box-shadow:0 6px 16px rgba(8,74,140,.2); transition:background .15s, transform .15s, box-shadow .15s;
}
.support-cta:hover{background:var(--primary-dark); transform:translateY(-1px); box-shadow:0 8px 20px rgba(8,74,140,.25);}
.support-cta svg{flex:0 0 auto;}
.support-cta svg:last-child{width:15px; height:15px; opacity:.78;}
.support-later{
  min-height:44px; border:0; border-radius:10px; background:transparent; color:var(--muted);
  padding:8px 12px; font-size:13px; font-weight:700;
}
.support-later:hover{background:rgba(8,74,140,.07); color:var(--text);}
.support-cta:focus-visible,
.support-later:focus-visible,
.footer-support-link:focus-visible{outline:3px solid var(--warning); outline-offset:3px;}
:root[data-theme="dark"] .support-banner{
  background:
    radial-gradient(circle at 104% -30%, rgba(143,197,255,.09) 0 90px, transparent 91px),
    linear-gradient(135deg, #16243a 0%, #171e2e 62%, #231d32 100%);
  border-color:#35445e;
}
:root[data-theme="dark"] .support-eyebrow,
:root[data-theme="dark"] .footer-support-link{color:#8fc5ff;}
:root[data-theme="dark"] .support-icon{color:#8fc5ff; background:rgba(143,197,255,.1); border-color:rgba(143,197,255,.2);}

@media (max-width:680px){
  .support-banner{grid-template-columns:44px minmax(0, 1fr); gap:12px; padding:18px;}
  .support-icon{width:44px; height:44px; border-radius:13px; align-self:start;}
  .support-icon svg{width:22px; height:22px;}
  .support-actions{grid-column:1 / -1; min-width:0; width:100%; margin-top:2px;}
  .support-cta{width:100%;}
}

@media (max-width:420px){
  .footer-support-link{flex-wrap:wrap; column-gap:7px;}
  .footer-support-provider{flex-basis:100%; justify-content:center;}
}

.review-list h3{margin:0 0 12px;}
.review-row{
  background:var(--card); border:1px solid var(--border); border-left:4px solid var(--border);
  border-radius:12px; padding:14px 16px; margin-bottom:10px;
}
.review-row.ok{border-left-color:var(--success);}
.review-row.bad{border-left-color:var(--danger);}
.review-head{display:flex; gap:10px; align-items:flex-start; font-weight:700; font-size:14.5px;}
.review-icon{flex:0 0 auto; display:flex; margin-top:2px;}
.review-icon.ok{color:var(--success);}
.review-icon.bad{color:var(--danger);}
.review-body{margin-top:8px; font-size:13.5px; color:var(--text);}
.review-body .sign-box{align-items:flex-start; margin-bottom:10px;}

/* STATS */
h3{margin:26px 0 12px; font-size:16px;}
.cat-bar-row{display:flex; align-items:center; gap:10px; margin-bottom:10px;}
.cat-label{width:70px; font-size:13px; font-weight:700; color:var(--muted);}
.cat-bar{flex:1; height:10px; background:var(--ring-bg); border-radius:999px; overflow:hidden;}
.cat-bar-fill{height:100%; background:var(--primary);}
.cat-pct{width:40px; text-align:right; font-size:13px; font-weight:700;}
.search-field input[type="search"]{
  width:100%; box-sizing:border-box; padding:11px 14px; border-radius:12px;
  border:1px solid var(--border); background:var(--card); color:var(--text); font-size:14px;
}
.search-field input[type="search"]:focus{outline:2px solid var(--primary); outline-offset:1px;}
.search-results{margin-top:12px;}
.search-results:empty{margin-top:0;}

.most-failed{display:flex; flex-direction:column; gap:8px;}
.mf-row{display:flex; align-items:center; gap:10px; padding:10px 12px; background:var(--bg); border-radius:10px; font-size:13.5px;}
.mf-code{font-weight:800; color:var(--primary); min-width:52px; font-size:12px;}
.mf-text{flex:1;}
.mf-count{color:var(--danger); font-weight:700; font-size:12.5px; white-space:nowrap;}
.hist-table{width:100%; border-collapse:collapse; font-size:13.5px;}
.hist-table th, .hist-table td{padding:9px 8px; text-align:left; border-bottom:1px solid var(--border);}
.tag{padding:3px 9px; border-radius:999px; font-size:11.5px; font-weight:700; white-space:nowrap; display:inline-block;}
.tag-ok{background:rgba(26,158,92,.15); color:var(--success);}
.tag-bad{background:rgba(208,36,42,.12); color:var(--danger);}

.modal-overlay{
  position:fixed; inset:0; background:rgba(10,14,24,.55); display:flex; align-items:center;
  justify-content:center; z-index:100; padding:20px;
}
.modal-box{
  background:var(--card); border:1px solid var(--border); border-radius:16px;
  padding:22px; max-width:360px; width:100%; box-shadow:var(--shadow);
}
.modal-box p{margin:0 0 18px; font-size:14.5px; line-height:1.5;}
.modal-actions{display:flex; justify-content:flex-end; gap:10px;}

@media (max-width:520px){
  .hero h1{font-size:21px;}
  .hero-stats{gap:16px;}
  .mainnav{width:100%; justify-content:space-between;}
  .navbtn{padding:8px 8px; font-size:12.5px;}
}