:root{
  --bg:#FAF9F5; --bg-alt:#F4F1EA; --surface:#FFFFFF;
  --accent:#C15F3C; --accent-soft:#CC785C; --accent-tint:#F6E8E1;
  --ink:#1F1E1C; --muted:#6F6B64; --hairline:#E8E3D9; --alert:#C0392B;
  --radius:14px; --shadow:0 1px 2px rgba(31,30,28,.05),0 8px 24px rgba(31,30,28,.06);
  --maxw:760px;
}
*{box-sizing:border-box}
html,body{margin:0}
body{
  background:var(--bg); color:var(--ink);
  font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  line-height:1.55; -webkit-font-smoothing:antialiased;
}
a{color:var(--accent)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:24px 20px 80px}
.hidden{display:none !important}
h1{font-size:2rem;line-height:1.15;margin:0 0 .4em;letter-spacing:-.01em}
h2{font-size:1.3rem;margin:1.6em 0 .5em}
.muted{color:var(--muted)}
.btn{
  appearance:none;border:1px solid transparent;cursor:pointer;
  background:var(--accent);color:#fff;font-weight:600;font-size:1rem;
  padding:12px 22px;border-radius:10px;transition:background .15s,transform .05s;
}
.btn:hover{background:#a94f30}
.btn:active{transform:translateY(1px)}
.btn.secondary{background:var(--surface);color:var(--ink);border-color:var(--hairline)}
.btn.secondary:hover{background:var(--bg-alt)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn:focus-visible,.opt:focus-visible,.qjump:focus-visible,.star:focus-visible,input:focus-visible,textarea:focus-visible{
  outline:3px solid var(--accent-soft);outline-offset:2px
}
.card{background:var(--surface);border:1px solid var(--hairline);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}

/* ---- landing ---- */
.brandbar{display:flex;align-items:center;gap:10px;color:var(--muted);font-weight:600;font-size:.85rem;letter-spacing:.04em;text-transform:uppercase}
.dot{width:10px;height:10px;border-radius:50%;background:var(--accent)}
.facts{display:flex;flex-wrap:wrap;gap:12px;margin:18px 0 26px}
.fact{background:var(--bg-alt);border:1px solid var(--hairline);border-radius:10px;padding:10px 14px;font-size:.9rem}
.fact b{display:block;font-size:1.15rem}

/* ---- exam ---- */
.topbar{position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--hairline);
  display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 20px}
.topbar .inner{max-width:var(--maxw);margin:0 auto;width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px}
.timer{font-variant-numeric:tabular-nums;font-weight:700;font-size:1.1rem;background:var(--surface);border:1px solid var(--hairline);border-radius:10px;padding:6px 12px}
.timer.warn{color:#fff;background:var(--alert);border-color:var(--alert)}
.progress{font-size:.85rem;color:var(--muted)}
.qsource{font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:6px}
.qtext{font-size:1.18rem;font-weight:600;margin:0 0 18px}
.opts{display:flex;flex-direction:column;gap:10px}
.opt{display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;
  background:var(--surface);border:1.5px solid var(--hairline);border-radius:12px;padding:14px 16px;cursor:pointer;font-size:1rem;color:var(--ink);transition:border-color .12s,background .12s}
.opt:hover{border-color:var(--accent-soft)}
.opt.selected{border-color:var(--accent);background:var(--accent-tint)}
.opt .mark{flex:0 0 auto;width:22px;height:22px;border-radius:50%;border:2px solid var(--hairline);display:grid;place-items:center;margin-top:1px;font-size:.7rem;color:#fff}
.opt.selected .mark{background:var(--accent);border-color:var(--accent)}
.opt.selected .mark::after{content:"✓"}
.nav{display:flex;justify-content:space-between;gap:12px;margin-top:22px}

/* ---- side panel ---- */
.layout{display:flex;gap:20px;align-items:flex-start}
.panel{flex:0 0 230px;position:sticky;top:78px}
.panel h3{margin:.2em 0 .6em;font-size:.95rem}
.grid{display:grid;grid-template-columns:repeat(6,1fr);gap:6px}
.qjump{aspect-ratio:1;border:1px solid var(--hairline);background:var(--surface);border-radius:8px;cursor:pointer;font-size:.8rem;font-weight:600;color:var(--ink)}
.qjump.answered{background:var(--accent-tint);border-color:var(--accent-soft)}
.qjump.unanswered{border-color:var(--alert);color:var(--alert)}
.qjump.current{outline:2px solid var(--accent)}
.legend{font-size:.78rem;color:var(--muted);margin-top:10px;display:flex;flex-direction:column;gap:4px}
.legend span{display:inline-flex;align-items:center;gap:6px}
.sw{width:12px;height:12px;border-radius:3px;display:inline-block;border:1px solid var(--hairline)}

/* ---- modal ---- */
.overlay{position:fixed;inset:0;background:rgba(31,30,28,.45);display:grid;place-items:center;z-index:50;padding:20px}
.modal{max-width:440px;width:100%}
.modal .grid{margin:12px 0}

/* ---- results ---- */
.score{font-size:3rem;font-weight:800;letter-spacing:-.02em}
.badge{display:inline-block;padding:4px 12px;border-radius:999px;font-weight:700;font-size:.85rem}
.badge.pass{background:#E5F0E5;color:#2E7D32}
.badge.fail{background:var(--accent-tint);color:var(--accent)}
.rev{border:1px solid var(--hairline);border-radius:12px;padding:14px 16px;margin:12px 0;background:var(--surface)}
.rev .q{font-weight:600;margin-bottom:8px}
.rev .o{padding:8px 12px;border-radius:8px;margin:4px 0;font-size:.95rem;border:1px solid transparent}
.rev .o.correct{background:#E5F0E5;border-color:#a9d3ab}
.rev .o.wrong{background:#FBE7E4;border-color:#e6b3ab}
.rev .exp{font-size:.9rem;color:var(--muted);margin-top:8px}

/* ---- feedback ---- */
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font-size:.85rem;font-weight:600}
input[type=text],textarea{font:inherit;padding:10px 12px;border:1px solid var(--hairline);border-radius:10px;background:var(--surface);color:var(--ink)}
textarea{min-height:90px;resize:vertical}
.stars{display:flex;gap:4px}
.star{font-size:1.6rem;line-height:1;background:none;border:none;cursor:pointer;color:var(--hairline);padding:0}
.star.on{color:var(--accent)}
.fb-item{border-bottom:1px solid var(--hairline);padding:14px 0}
.fb-item:last-child{border-bottom:none}
.fb-head{display:flex;justify-content:space-between;gap:10px;align-items:baseline}
.fb-name{font-weight:600}
.fb-stars{color:var(--accent);letter-spacing:2px}
.fb-date{font-size:.78rem;color:var(--muted)}
.fb-msg{margin:4px 0 0;white-space:pre-wrap}

@media (max-width:720px){
  .layout{flex-direction:column}
  .panel{position:static;flex:1 1 auto;width:100%;order:-1}
  .grid{grid-template-columns:repeat(10,1fr)}
  h1{font-size:1.6rem}
}