:root{--blue:#1b4f9c;--blue-d:#123a74;--bg:#eef2f8;--card:#fff;--text:#1f2937;--muted:#6b7280;--green:#2e9e5b;--red:#d64545;--orange:#f59e0b;--line:#d9e0ec}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,"Segoe UI",Roboto,"Noto Sans Devanagari",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.55}
a{color:var(--blue)}
button{font:inherit;cursor:pointer}
[hidden]{display:none!important}

/* top bar */
.topbar{background:var(--blue);color:#fff;display:flex;align-items:center;gap:16px;padding:10px 20px;border-bottom:4px solid var(--orange)}
.topbar a{color:#fff;text-decoration:none}
.brand{font-weight:700;font-size:18px;display:flex;align-items:center;gap:8px;white-space:nowrap}
.logo{background:#fff;color:var(--blue);border-radius:6px;padding:2px 7px;font-weight:800}
.topbar-title{flex:1;text-align:center;font-size:15px;opacity:.95}
.lang{display:flex;gap:4px}
.lang button{background:transparent;border:1px solid rgba(255,255,255,.6);color:#fff;border-radius:5px;padding:4px 10px;font-size:13px}
.lang button.on{background:#fff;color:var(--blue);font-weight:600}
.nav-links{display:flex;gap:14px;font-size:14px}

main{max-width:1100px;margin:0 auto;padding:20px 16px 40px}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:22px;box-shadow:0 1px 3px rgba(20,40,80,.06)}
h1,h2,h3{line-height:1.25;margin:0 0 10px}
.btn{display:inline-block;border:0;border-radius:7px;padding:11px 24px;font-weight:600;font-size:16px;text-decoration:none;text-align:center}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-d)}
.btn-orange{background:var(--orange);color:#1f1300}
.btn-ghost{background:#fff;color:var(--blue);border:1px solid var(--blue)}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* home */
.hero{background:linear-gradient(135deg,var(--blue),#2f6fc4);color:#fff;border-radius:12px;padding:40px 28px;text-align:center}
.hero h1{font-size:34px}
.hero p{max-width:640px;margin:0 auto 22px;font-size:17px;opacity:.95}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:20px 0}
.stat{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px;text-align:center}
.stat b{display:block;font-size:26px;color:var(--blue)}
.stat span{color:var(--muted);font-size:14px}
.grid3{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin:18px 0}
.signs-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:12px}
.sign-item{text-align:center;border:1px solid var(--line);border-radius:8px;padding:10px;background:#fff}
.sign-item svg{width:72px;height:72px}
.sign-item div{font-size:13px;margin-top:4px;line-height:1.3}
.sign-item small{color:var(--muted);display:block}
section.block{margin-top:26px}
details{background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px 16px;margin-bottom:8px}
summary{cursor:pointer;font-weight:600}
.last-score{margin-top:14px;font-size:15px}

footer{background:#13294f;color:#cfd8ea;padding:20px;font-size:13px;text-align:center}
footer p{max-width:820px;margin:4px auto}

/* exam: start */
.start ul{padding-left:20px}
.start li{margin-bottom:6px}
.field{margin:18px 0}
.field label{display:block;font-weight:600;margin-bottom:6px}
.field input{width:100%;max-width:340px;padding:10px 12px;border:1px solid #b9c4d8;border-radius:7px;font-size:16px}

/* exam: running */
.exam-grid{display:grid;grid-template-columns:1fr 300px;gap:16px;align-items:start}
.qhead{display:flex;justify-content:space-between;align-items:center;gap:12px;background:#e8eefb;border:1px solid var(--line);border-radius:8px;padding:10px 14px;margin-bottom:14px;font-weight:600}
.timer{background:#fff;border:2px solid var(--blue);color:var(--blue);border-radius:8px;padding:4px 14px;font-variant-numeric:tabular-nums;font-size:20px;min-width:92px;text-align:center}
.timer.low{border-color:var(--red);color:var(--red);animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.55}}
.bar{height:6px;background:#dfe6f3;border-radius:4px;overflow:hidden;margin-bottom:16px}
.bar i{display:block;height:100%;background:var(--blue);width:100%;transition:width 1s linear}
.qtext{font-size:19px;font-weight:600;margin:0 0 14px}
.qsign{display:flex;justify-content:center;margin:6px 0 16px}
.qsign svg{width:130px;height:130px;border:1px solid var(--line);border-radius:10px;padding:8px;background:#fff}
.options{display:grid;gap:10px}
.option{display:flex;gap:12px;align-items:flex-start;border:1.5px solid var(--line);border-radius:8px;padding:12px 14px;cursor:pointer;background:#fff}
.option:hover{border-color:var(--blue);background:#f5f8ff}
.option input{margin-top:4px;accent-color:var(--blue)}
.option.sel{border-color:var(--blue);background:#eaf1ff}
.option .k{font-weight:700;color:var(--blue);min-width:18px}
.actions{display:flex;justify-content:space-between;align-items:center;margin-top:20px;gap:10px;flex-wrap:wrap}
.hint{color:var(--muted);font-size:13px}

.side h3{font-size:15px;margin-bottom:8px}
.cand{display:flex;gap:10px;align-items:center;margin-bottom:14px}
.avatar{width:44px;height:44px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:18px}
.palette{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.palette span{height:38px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:14px;background:#e5e9f2;color:#556}
.palette span.done{background:var(--green);color:#fff}
.palette span.skip{background:var(--orange);color:#1f1300}
.palette span.cur{background:var(--blue);color:#fff;outline:3px solid #a9c3f0}
.legend{display:flex;flex-wrap:wrap;gap:6px 12px;margin-top:12px;font-size:12px;color:var(--muted)}
.legend i{display:inline-block;width:11px;height:11px;border-radius:3px;margin-right:4px;vertical-align:-1px}

/* result */
.res-top{display:grid;grid-template-columns:auto 1fr;gap:22px;align-items:center}
.score-ring{width:130px;height:130px;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;border:10px solid var(--green);font-weight:800;font-size:32px}
.score-ring small{font-size:12px;font-weight:500;color:var(--muted)}
.score-ring.fail{border-color:var(--red)}
.badge{display:inline-block;padding:4px 14px;border-radius:20px;color:#fff;font-weight:700;margin-bottom:6px}
.badge.pass{background:var(--green)}.badge.fail{background:var(--red)}
.res-stats{display:flex;gap:18px;flex-wrap:wrap;margin:8px 0 14px;font-size:15px}
.review{margin-top:20px}
.rv{border:1px solid var(--line);border-left:5px solid var(--line);border-radius:8px;padding:12px 14px;margin-bottom:10px;background:#fff}
.rv.ok{border-left-color:var(--green)}.rv.bad{border-left-color:var(--red)}.rv.na{border-left-color:var(--orange)}
.rv .row{display:flex;gap:12px;align-items:flex-start}
.rv svg{width:54px;height:54px;flex:none}
.rv b{display:block;margin-bottom:4px}
.rv .ans{font-size:14px}
.rv .ans .good{color:var(--green);font-weight:600}
.rv .ans .wrong{color:var(--red);font-weight:600}

@media (max-width:820px){
  .exam-grid{grid-template-columns:1fr}
  .topbar{flex-wrap:wrap;padding:10px 12px}
  .topbar-title{order:3;flex-basis:100%;text-align:left}
  .hero h1{font-size:26px}
  .res-top{grid-template-columns:1fr;justify-items:center;text-align:center}
  .res-stats{justify-content:center}
  .nav-links{display:none}
}