/* Public marketing/content pages. Self-contained: the app's styles.css is not loaded here. */
:root{
  --bg:#020814;
  --bg-soft:#061226;
  --card:#0b1529;
  --card-2:#0f1c34;
  --card-3:#13223e;
  --line:rgba(146,169,214,.18);
  --line-strong:rgba(100,151,255,.42);
  --text:#f7fbff;
  --muted:#9ba8c3;
  --muted-2:#6f7c9b;
  --blue:#3d7bff;
  --blue-2:#61b9ff;
  --cyan:#49e2c5;
  --green:#36d69f;
  --accent:var(--blue);
  --radius:14px;
  --radius-lg:22px;
  --radius-pill:999px;
  --shadow:0 18px 44px -16px rgba(0,0,0,.55);
  --maxw:1120px;
}

@media (prefers-color-scheme: light){
  :root{
    --bg:#eef4fc;
    --bg-soft:#e2ecf9;
    --card:#ffffff;
    --card-2:#f4f8fe;
    --card-3:#e9f1fb;
    --line:rgba(45,65,105,.16);
    --line-strong:rgba(46,111,233,.4);
    --text:#0d1830;
    --muted:#4d5a72;
    --muted-2:#6b7791;
    --shadow:0 18px 40px -20px rgba(47,70,110,.3);
  }
}

*{box-sizing:border-box}
/* Class selectors below (.btn) outrank the browser's [hidden] rule, so the
   auth-state swap in the header would leave both variants visible. */
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(900px 500px at 15% -10%, rgba(61,123,255,.16), transparent 60%),
    radial-gradient(700px 420px at 85% 0%, rgba(73,226,197,.12), transparent 55%),
    var(--bg);
  color:var(--text);
  font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit}
img{max-width:100%}

/* ------------------------------------------------------------- header --- */
.site-header{
  max-width:var(--maxw);
  margin:0 auto;
  padding:18px 22px;
  display:flex;
  align-items:center;
  gap:18px;
  flex-wrap:wrap;
}
.brand{
  display:flex;
  align-items:center;
  gap:9px;
  font-weight:800;
  font-size:17px;
  text-decoration:none;
}
.brand-mark{
  width:30px;height:30px;
  display:grid;place-items:center;
  border-radius:9px;
  background:linear-gradient(135deg,var(--blue),var(--cyan));
  color:#04101f;
  font-size:15px;
}
.site-nav{display:flex;gap:16px;flex:1;flex-wrap:wrap}
.site-nav a{
  color:var(--muted);
  text-decoration:none;
  font-weight:600;
  font-size:14.5px;
}
.site-nav a:hover{color:var(--text)}
.site-actions{display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.lang-switch{
  padding:7px 11px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  font-size:12.5px;
  font-weight:700;
  color:var(--muted);
  text-decoration:none;
}
.lang-switch:hover{color:var(--text);border-color:var(--line-strong)}

.btn{
  display:inline-block;
  padding:10px 18px;
  border-radius:var(--radius-pill);
  font-weight:700;
  font-size:14.5px;
  text-decoration:none;
  border:1px solid transparent;
  transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease;
  white-space:nowrap;
}
.btn.lg{padding:14px 26px;font-size:16px}
.btn.primary{
  background:linear-gradient(135deg,var(--blue),var(--blue-2));
  color:#fff;
  box-shadow:0 10px 26px -12px rgba(61,123,255,.85);
}
.btn.primary:hover{transform:translateY(-1px);box-shadow:0 14px 30px -12px rgba(61,123,255,.95)}
.btn.ghost{border-color:var(--line);color:var(--text);background:var(--card)}
.btn.ghost:hover{border-color:var(--line-strong)}

/* --------------------------------------------------------------- main --- */
main{max-width:var(--maxw);margin:0 auto;padding:0 22px 60px}
h1{font-size:clamp(30px,5vw,48px);line-height:1.12;margin:0 0 14px;letter-spacing:-.02em}
h2{font-size:clamp(22px,3vw,30px);margin:0 0 16px;letter-spacing:-.015em}
h3{font-size:18px;margin:0 0 8px}
p{margin:0 0 12px}

.hero{padding:46px 0 34px}
.hero-copy{max-width:720px}
.eyebrow{
  display:inline-block;
  margin-bottom:14px;
  padding:6px 14px;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  background:var(--card);
  color:var(--muted);
  font-size:13px;
  font-weight:600;
}
.hero-copy p{font-size:clamp(16px,1.6vw,19px);color:var(--muted);max-width:640px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}

.exam-hero{
  border-left:4px solid var(--accent);
  padding-left:22px;
  display:flex;
  gap:32px;
  justify-content:space-between;
  flex-wrap:wrap;
  align-items:flex-start;
}
.hero-stats{
  display:grid;
  grid-template-columns:repeat(2,minmax(130px,1fr));
  gap:12px;
  margin:0;
  min-width:280px;
}
.hero-stats div{
  padding:14px 16px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--card);
}
.hero-stats dt{color:var(--muted);font-size:12.5px;margin-bottom:3px}
.hero-stats dd{margin:0;font-size:24px;font-weight:800}

.block{padding:34px 0;border-top:1px solid var(--line)}
.block-lede{color:var(--muted);max-width:720px}

/* --------------------------------------------------------- exam cards --- */
.exam-cards{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
  gap:16px;
}
.exam-card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:8px;
  padding:22px;
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background:linear-gradient(160deg,var(--card),var(--card-2));
  text-decoration:none;
  transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.exam-card:hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:var(--shadow)}
.exam-card::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:3px;
  border-radius:var(--radius-lg) var(--radius-lg) 0 0;
  background:var(--accent);
}
.exam-card .flag{font-size:28px;line-height:1}
.exam-card h3{margin:0}
.exam-card p{color:var(--muted);font-size:14px;flex:1;margin:0}
.card-stats{display:flex;flex-wrap:wrap;gap:6px;list-style:none;padding:0;margin:4px 0 0}
.card-stats li{
  padding:4px 10px;
  border-radius:var(--radius-pill);
  background:var(--card-3);
  border:1px solid var(--line);
  color:var(--muted);
  font-size:12px;
}
.card-cta{color:var(--accent);font-weight:700;font-size:14px;margin-top:6px}

/* ----------------------------------------------------------- features --- */
.features{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:16px;
}
.feature{
  padding:20px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--card);
}
.feature-icon{font-size:24px;display:block;margin-bottom:8px}
.feature p{color:var(--muted);font-size:14.5px;margin:0}

.steps{list-style:none;padding:0;margin:0;display:grid;gap:14px}
.step{display:flex;gap:14px;align-items:flex-start}
.step-num{
  flex:0 0 32px;
  height:32px;
  display:grid;place-items:center;
  border-radius:50%;
  background:linear-gradient(135deg,var(--blue),var(--cyan));
  color:#04101f;
  font-weight:800;
}
.step p{color:var(--muted);margin:2px 0 0;font-size:14.5px}

/* ------------------------------------------------------------ tables --- */
.table-wrap{overflow-x:auto;margin:12px 0}
table{border-collapse:collapse;width:100%;font-size:14.5px;min-width:520px}
th,td{border:1px solid var(--line);padding:10px 12px;text-align:left}
th{background:var(--card-3);font-weight:700}

/* ------------------------------------------------------ sample cards --- */
.samples{display:grid;gap:14px;margin-bottom:20px}
.sample{
  padding:20px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--card);
}
.sample-meta{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:10px}
.pill{
  padding:3px 11px;
  border-radius:var(--radius-pill);
  background:rgba(61,123,255,.16);
  border:1px solid var(--line-strong);
  font-size:12px;
  font-weight:600;
}
.pill.soft{background:var(--card-3);border-color:var(--line);color:var(--muted);font-weight:500}
.sample-question{font-size:16px;margin:0 0 12px;line-height:1.6}
.sample-choices{margin:0 0 12px;padding-left:24px;display:grid;gap:6px}
.sample-choices li{color:var(--muted);font-size:14.5px}
.sample-choices li.correct{color:var(--green);font-weight:600}
.sample-answer summary{
  cursor:pointer;
  color:var(--blue-2);
  font-weight:600;
  font-size:14px;
}
.sample-answer p{margin:10px 0 0;padding:12px 14px;border-radius:var(--radius);background:var(--card-3);font-size:14px}

/* ---------------------------------------------------------- materials --- */
.material{
  margin-bottom:18px;
  padding:22px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--card);
}
.material h3{font-size:20px;margin-bottom:10px}
.prose h3,.prose h4,.prose h5{margin:18px 0 8px;font-size:17px}
.prose p{color:var(--text);font-size:15px}
.prose ul,.prose ol{padding-left:22px;margin:8px 0}
.prose li{margin-bottom:5px;font-size:15px}
.prose code{background:var(--card-3);padding:1px 6px;border-radius:6px;font-size:13.5px}
.prose strong{color:var(--text)}

/* --------------------------------------------------------------- faq --- */
.faq{display:grid;gap:10px}
.faq details{
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--card);
  padding:14px 18px;
}
.faq summary{cursor:pointer;font-weight:600;font-size:15.5px}
.faq p{margin:10px 0 0;color:var(--muted);font-size:15px}

/* --------------------------------------------------------------- cta --- */
.cta{
  margin-top:34px;
  padding:40px 28px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-lg);
  background:linear-gradient(150deg,rgba(61,123,255,.16),rgba(73,226,197,.1));
  text-align:center;
}
.cta p{color:var(--muted);max-width:520px;margin:0 auto 20px}

.other-exams{padding-top:34px;border-top:1px solid var(--line);margin-top:34px}
.exam-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px}
.exam-link{
  display:flex;
  align-items:center;
  gap:10px;
  padding:14px 16px;
  border:1px solid var(--line);
  border-left:3px solid var(--accent);
  border-radius:var(--radius);
  background:var(--card);
  text-decoration:none;
}
.exam-link:hover{border-color:var(--accent)}
.exam-link .flag{font-size:20px}
.exam-link small{color:var(--muted);margin-left:auto;font-size:12.5px}

/* ------------------------------------------------------------ footer --- */
.site-footer{
  border-top:1px solid var(--line);
  background:var(--bg-soft);
  padding:34px 22px 22px;
}
.footer-cols{
  max-width:var(--maxw);
  margin:0 auto;
  display:grid;
  grid-template-columns:2fr 1fr 1fr;
  gap:26px;
}
.footer-cols p{color:var(--muted);font-size:14px;max-width:340px}
.footer-cols ul{list-style:none;padding:0;margin:8px 0 0;display:grid;gap:6px}
.footer-cols a{color:var(--muted);text-decoration:none;font-size:14px}
.footer-cols a:hover{color:var(--text)}
.footer-legal{
  max-width:var(--maxw);
  margin:26px auto 0;
  color:var(--muted-2);
  font-size:13px;
}

@media (max-width:760px){
  .site-header{gap:12px;padding:14px 18px}
  .site-nav{order:3;flex-basis:100%;gap:12px}
  /* The three header buttons do not fit next to the brand on a phone. */
  .site-actions{margin-left:auto}
  .site-actions .btn{padding:8px 14px;font-size:13.5px}
  .site-actions .btn.ghost{display:none}
  .exam-hero{padding-left:16px}
  .hero-stats{grid-template-columns:repeat(2,1fr);min-width:0;width:100%}
  .footer-cols{grid-template-columns:1fr}
  main{padding:0 18px 48px}
}

/* Nothing on these pages may push the document sideways. */
body{overflow-x:hidden}

@media (prefers-reduced-motion:reduce){
  *{transition:none!important;scroll-behavior:auto!important}
}

/* ====================== public demo test ====================== */
.demo-widget{
  border:1px solid var(--line);
  border-left:4px solid var(--accent);
  border-radius:var(--radius-lg);
  background:linear-gradient(160deg,var(--card),var(--card-2));
  padding:26px;
  box-shadow:var(--shadow);
}

.demo-start{display:grid;gap:12px;justify-items:start}
.demo-badge{
  padding:5px 13px;
  border-radius:var(--radius-pill);
  background:rgba(61,123,255,.14);
  border:1px solid var(--line-strong);
  font-size:13px;
  font-weight:700;
}
.demo-start h3{margin:0;font-size:24px}
.demo-start p{margin:0;color:var(--muted);max-width:560px}
.demo-start small{color:var(--muted-2);font-size:13px}
.demo-section-pick{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--muted);flex-wrap:wrap}
.demo-section-pick select{
  padding:9px 13px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--card);
  color:var(--text);
  font-size:14px;
  font-family:inherit;
}

.demo-loading{display:grid;gap:14px;justify-items:center;padding:44px 10px;color:var(--muted)}
.demo-spinner{
  width:40px;height:40px;
  border-radius:50%;
  border:4px solid var(--card-3);
  border-top-color:var(--accent);
  animation:demo-spin .9s linear infinite;
}
@keyframes demo-spin{to{transform:rotate(360deg)}}

.demo-topbar{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:10px}
.demo-counter{font-weight:700;font-size:14px;color:var(--muted)}
.demo-pill{
  padding:3px 11px;
  border-radius:var(--radius-pill);
  background:rgba(61,123,255,.15);
  border:1px solid var(--line-strong);
  font-size:12px;
  font-weight:600;
}
.demo-pill.soft{background:var(--card-3);border-color:var(--line);color:var(--muted);font-weight:500}
.demo-progress{height:5px;border-radius:999px;background:var(--card-3);overflow:hidden;margin-bottom:18px}
.demo-progress span{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--cyan));transition:width .3s ease}

.demo-question{font-size:18px;line-height:1.6;margin:0 0 16px}
.demo-hint{margin:0 0 10px;color:var(--muted);font-size:13px}
.demo-choices{display:grid;gap:9px;margin-bottom:14px}
.demo-choice{
  display:flex;
  align-items:flex-start;
  gap:12px;
  width:100%;
  text-align:left;
  padding:14px 16px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--card);
  color:var(--text);
  font-size:15px;
  line-height:1.5;
  font-family:inherit;
  cursor:pointer;
  transition:border-color .13s ease,background .13s ease,transform .13s ease;
}
.demo-choice:hover:not(:disabled){border-color:var(--line-strong);background:var(--card-2);transform:translateX(2px)}
.demo-choice:disabled{cursor:default}
.demo-choice.picked{border-color:var(--accent);background:rgba(61,123,255,.12)}
.demo-choice.correct{border-color:var(--green);background:rgba(54,214,159,.13)}
.demo-choice.wrong{border-color:#ff5574;background:rgba(255,85,116,.11)}
.demo-letter{
  flex:0 0 27px;height:27px;
  display:grid;place-items:center;
  border-radius:8px;
  background:var(--card-3);
  border:1px solid var(--line);
  font-weight:700;font-size:13px;
}
.demo-choice.picked .demo-letter{background:var(--accent);border-color:var(--accent);color:#04101f}
.demo-choice.correct .demo-letter{background:var(--green);border-color:var(--green);color:#04140d}
.demo-choice.wrong .demo-letter{background:#ff5574;border-color:#ff5574;color:#fff}

.demo-input{
  width:min(320px,100%);
  padding:13px 15px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--card);
  color:var(--text);
  font-size:16px;
  font-family:inherit;
  margin-bottom:12px;
}
.demo-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(61,123,255,.35)}

.demo-feedback{
  padding:15px 17px;
  border-radius:var(--radius);
  border:1px solid var(--line);
  margin-bottom:16px;
  font-size:14.5px;
  line-height:1.6;
  animation:demo-fade .25s ease;
}
@keyframes demo-fade{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}
.demo-feedback.ok{border-color:rgba(54,214,159,.5);background:rgba(54,214,159,.09)}
.demo-feedback.bad{border-color:rgba(255,85,116,.5);background:rgba(255,85,116,.08)}
.demo-feedback strong{display:block;margin-bottom:6px}
.demo-feedback p{margin:0;color:var(--muted)}
.demo-next{width:100%}

.demo-result-head{display:flex;align-items:center;gap:22px;flex-wrap:wrap;margin-bottom:18px}
.demo-result-head h3{margin:0 0 4px;font-size:26px}
.demo-result-head p{margin:0 0 4px;color:var(--muted)}
.demo-result-head small{color:var(--muted-2);font-size:13px}
.demo-ring{
  --size:118px;
  width:var(--size);height:var(--size);
  flex:0 0 var(--size);
  border-radius:50%;
  background:conic-gradient(var(--accent) calc(var(--pct)*1%),var(--card-3) 0);
  display:grid;place-items:center;
}
.demo-ring span{
  width:calc(var(--size) - 22px);height:calc(var(--size) - 22px);
  border-radius:50%;
  background:var(--card);
  display:grid;place-items:center;
  font-weight:800;font-size:26px;
}
.demo-weak{margin-bottom:18px}
.demo-weak strong{display:block;margin-bottom:8px;font-size:14.5px}
.demo-weak-list{display:flex;flex-wrap:wrap;gap:7px}

.demo-cta{
  padding:20px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  background:linear-gradient(150deg,rgba(61,123,255,.14),rgba(73,226,197,.09));
}
.demo-cta p{margin:0 0 14px;color:var(--text);font-size:15px}
.demo-cta-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}

.demo-toast{
  position:fixed;
  left:50%;bottom:24px;
  transform:translateX(-50%) translateY(14px);
  z-index:90;
  padding:12px 18px;
  border-radius:var(--radius);
  border:1px solid var(--line-strong);
  background:#0d1730;
  color:#fff;
  font-size:14px;
  opacity:0;
  pointer-events:none;
  transition:opacity .2s ease,transform .2s ease;
}
.demo-toast.visible{opacity:1;transform:translateX(-50%)}

/* landing: quick links into each exam demo */
.demo-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}
.demo-link{
  display:flex;
  align-items:center;
  gap:11px;
  padding:16px 18px;
  border:1px solid var(--line);
  border-left:3px solid var(--accent);
  border-radius:var(--radius);
  background:var(--card);
  text-decoration:none;
  font-weight:600;
  transition:transform .15s ease,border-color .15s ease;
}
.demo-link:hover{transform:translateY(-2px);border-color:var(--accent)}
.demo-link .flag{font-size:22px}
.demo-link small{display:block;color:var(--muted);font-weight:400;font-size:12.5px}

@media (max-width:640px){
  .demo-widget{padding:18px}
  .demo-result-head{gap:16px}
  .demo-ring{--size:92px}
  .demo-cta-row .btn{width:100%;text-align:center}
}