:root{
  --bg:#f4f7fb; --card:#ffffff; --ink:#1c2431; --muted:#5c6b7f; --line:#e3e9f2;
  --brand:#2f6df0; --brand-dk:#1f52c0; --good:#1a9d5a; --warn:#e0922f; --bad:#d1495b;
  --shadow:0 6px 24px rgba(24,43,77,.08);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.5}
a{color:var(--brand);text-decoration:none}
.topbar{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;
  padding:12px 20px;background:#fff;border-bottom:1px solid var(--line)}
.brand{font-weight:800;font-size:20px;letter-spacing:-.3px;cursor:pointer;color:var(--ink)}
.brand span{color:var(--brand);margin:0 1px}
.userbox{display:flex;align-items:center;gap:12px;font-size:14px;color:var(--muted)}
.app{max-width:920px;margin:0 auto;padding:24px 18px 60px}
.foot{max-width:920px;margin:0 auto;padding:0 18px 40px;color:var(--muted);font-size:12px;text-align:center}

.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px;box-shadow:var(--shadow);margin-bottom:18px}
h1{font-size:28px;margin:.2em 0 .3em;letter-spacing:-.5px}
h2{font-size:20px;margin:.2em 0 .5em}
h3{font-size:16px;margin:.2em 0 .4em}
.muted{color:var(--muted)}
.row{display:flex;gap:12px;flex-wrap:wrap}
.grow{flex:1}
.center{text-align:center}
.spacer{height:10px}

label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin:10px 0 4px}
input,select{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;font-size:15px;background:#fff}
input:focus,select:focus{outline:none;border-color:var(--brand)}

.btn{display:inline-block;border:0;border-radius:10px;padding:11px 18px;font-size:15px;font-weight:700;
  background:var(--brand);color:#fff;cursor:pointer;transition:transform .05s ease, background .15s}
.btn:hover{background:var(--brand-dk)}
.btn:active{transform:translateY(1px)}
.btn.ghost{background:#eef3fd;color:var(--brand-dk)}
.btn.ghost:hover{background:#e2ebfb}
.btn.wide{width:100%}
.btn:disabled{opacity:.5;cursor:default}
.btn.lg{padding:14px 22px;font-size:16px}

.hero{background:linear-gradient(135deg,#2f6df0,#5b8bff);color:#fff;border:0}
.hero h1{color:#fff}
.hero .muted{color:#e8f0ff}
.pill{display:inline-block;background:#eaf1ff;color:var(--brand-dk);border-radius:999px;padding:3px 10px;font-size:12px;font-weight:700}

.bar{height:14px;background:#e9eef6;border-radius:999px;overflow:hidden}
.bar > i{display:block;height:100%;border-radius:999px;background:var(--good);transition:width .6s ease}
.barlabel{display:flex;justify-content:space-between;font-size:13px;margin-bottom:4px}

.kid{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px;border:1px solid var(--line);border-radius:12px;margin-bottom:10px}
.kid .grow{min-width:0}
.tabs{display:flex;gap:8px;margin-bottom:14px}
.tab{padding:8px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);cursor:pointer;font-weight:600;font-size:14px}
.tab.on{background:var(--brand);color:#fff;border-color:var(--brand)}

.q .stem{font-size:18px;font-weight:600;margin:6px 0 14px;white-space:pre-wrap}
.opt{display:block;width:100%;text-align:left;padding:13px 14px;border:1px solid var(--line);border-radius:11px;background:#fff;margin-bottom:10px;cursor:pointer;font-size:15px}
.opt:hover{border-color:var(--brand)}
.opt.sel{border-color:var(--brand);background:#eef3fd}
.opt.correct{border-color:var(--good);background:#e9f8f0}
.opt.wrong{border-color:var(--bad);background:#fbecef}
.progress-dots{display:flex;gap:6px;margin:4px 0 16px}
.dot{width:26px;height:6px;border-radius:999px;background:#dfe6f0}
.dot.done{background:var(--brand)}

.result-score{font-size:52px;font-weight:800;letter-spacing:-1px}
.tag{display:inline-block;font-size:13px;font-weight:700;padding:3px 10px;border-radius:999px}
.list{margin:8px 0 0;padding-left:18px}
.list li{margin:5px 0}
.err{background:#fbecef;color:#a12b3d;border:1px solid #f3c9d1;padding:10px 12px;border-radius:10px;font-size:14px;margin:8px 0}
.ok{background:#e9f8f0;color:#137a45;border:1px solid #bfe8d1;padding:10px 12px;border-radius:10px;font-size:14px;margin:8px 0}
.review .item{border:1px solid var(--line);border-radius:11px;padding:12px;margin-bottom:10px}
.email{background:#fbfdff;border:1px solid var(--line);border-radius:11px;padding:14px;white-space:pre-wrap;font-size:14px}
.small{font-size:13px}
.hide{display:none}
@media(max-width:560px){ h1{font-size:24px} .result-score{font-size:42px} }