/* ---------- design tokens ---------- */
:root{
  --bg:#f6f7fb; --surface:#ffffff; --surface-2:#f0f2f8; --border:#e2e6ef;
  --text:#161a25; --muted:#666f85; --brand:#4f46e5; --brand-soft:#eef0ff;
  --brand-ink:#ffffff; --ok:#0e8a5f; --ok-soft:#e6f6ef; --warn:#a36a00;
  --warn-soft:#fff5e0; --danger:#c8362f; --danger-soft:#fdecea;
  --gold:#b7861b; --silver:#7b8794; --bronze:#a2643a;
  --r:12px; --r-sm:8px; --shadow:0 1px 2px rgba(16,20,35,.06),0 8px 24px rgba(16,20,35,.06);
  --sp:16px; --maxw:1120px;
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#0f1117; --surface:#171a22; --surface-2:#1e222c; --border:#2a2f3c;
    --text:#e8eaf0; --muted:#9aa3b5; --brand:#7c78ff; --brand-soft:#232244;
    --ok:#3ecf95; --ok-soft:#122b22; --warn:#e0a33a; --warn-soft:#2c2413;
    --danger:#ff6b61; --danger-soft:#2e1917;
    --gold:#e0b350; --silver:#aab4c2; --bronze:#c9885a;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.3);
  }
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--text);font-family:var(--font);font-size:15px;line-height:1.5;
  -webkit-text-size-adjust:100%}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
h1,h2,h3{margin:0 0 .4em;line-height:1.25;letter-spacing:-.01em}
h1{font-size:1.6rem} h2{font-size:1.2rem} h3{font-size:1rem}
p{margin:0 0 1em}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px}

/* ---------- layout ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--sp)}
header.top{position:sticky;top:0;z-index:40;background:var(--surface);
  border-bottom:1px solid var(--border)}
.topbar{display:flex;align-items:center;gap:12px;height:58px;max-width:var(--maxw);
  margin:0 auto;padding:0 var(--sp)}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;letter-spacing:-.02em;
  color:var(--text)}
.brand:hover{text-decoration:none}
.brand .dot{width:26px;height:26px;border-radius:8px;background:var(--brand);color:#fff;
  display:grid;place-items:center;font-size:14px;font-weight:800}
nav.main{display:flex;gap:2px;margin-left:8px;flex:1;overflow-x:auto;scrollbar-width:none}
nav.main::-webkit-scrollbar{display:none}
nav.main a{padding:7px 11px;border-radius:8px;color:var(--muted);font-weight:500;
  white-space:nowrap;font-size:14px}
nav.main a:hover{background:var(--surface-2);text-decoration:none;color:var(--text)}
nav.main a.active{background:var(--brand-soft);color:var(--brand)}
main{padding:26px 0 60px}
.page-head{display:flex;align-items:flex-start;gap:12px;flex-wrap:wrap;margin-bottom:18px}
.page-head .grow{flex:1;min-width:220px}
.sub{color:var(--muted);font-size:14px;margin:0}

/* ---------- cards / surfaces ---------- */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);
  box-shadow:var(--shadow)}
.card.pad{padding:18px}
.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(275px,1fr))}
.stack{display:flex;flex-direction:column;gap:14px}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.row.tight{gap:6px}
.spacer{flex:1}
.center-narrow{max-width:430px;margin:36px auto}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:9px 15px;
  border-radius:var(--r-sm);border:1px solid var(--border);background:var(--surface);
  color:var(--text);font:inherit;font-weight:600;font-size:14px;cursor:pointer;
  transition:filter .12s,background .12s}
.btn:hover{background:var(--surface-2);text-decoration:none}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.primary{background:var(--brand);border-color:var(--brand);color:var(--brand-ink)}
.btn.primary:hover{filter:brightness(1.08)}
.btn.danger{background:var(--danger);border-color:var(--danger);color:#fff}
.btn.ghost{border-color:transparent;background:transparent;color:var(--muted)}
.btn.ghost:hover{background:var(--surface-2);color:var(--text)}
.btn.sm{padding:5px 10px;font-size:13px}
.btn.block{width:100%}
.btn-row{display:flex;gap:8px;flex-wrap:wrap}

/* ---------- forms ---------- */
label.field{display:block;margin-bottom:13px}
label.field > span{display:block;font-size:13px;font-weight:600;margin-bottom:5px;
  color:var(--muted)}
input[type=text],input[type=email],input[type=password],input[type=number],select,textarea{
  width:100%;padding:9px 11px;border:1px solid var(--border);border-radius:var(--r-sm);
  background:var(--surface);color:var(--text);font:inherit;font-size:14px}
textarea{min-height:88px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);
  box-shadow:0 0 0 3px var(--brand-soft)}
.check{display:flex;align-items:center;gap:8px;font-size:14px;margin-bottom:8px;cursor:pointer}
.check input{width:16px;height:16px;accent-color:var(--brand)}
.hint{font-size:12.5px;color:var(--muted);margin-top:4px}
.err{background:var(--danger-soft);color:var(--danger);padding:9px 12px;border-radius:var(--r-sm);
  font-size:14px;margin-bottom:12px}
fieldset{border:1px solid var(--border);border-radius:var(--r-sm);padding:12px;margin:0 0 13px}
legend{font-size:12.5px;font-weight:700;color:var(--muted);padding:0 6px}

/* ---------- badges ---------- */
.badge{display:inline-flex;align-items:center;gap:5px;padding:2px 9px;border-radius:999px;
  font-size:12px;font-weight:700;background:var(--surface-2);color:var(--muted);
  white-space:nowrap}
.badge.free{background:var(--ok-soft);color:var(--ok)}
.badge.paid{background:var(--warn-soft);color:var(--warn)}
.badge.draft{background:var(--surface-2);color:var(--muted)}
.badge.live{background:var(--brand-soft);color:var(--brand)}
.badge.ok{background:var(--ok-soft);color:var(--ok)}
.badge.bad{background:var(--danger-soft);color:var(--danger)}
.badge.pend{background:var(--warn-soft);color:var(--warn)}

/* ---------- tables ---------- */
.table-wrap{overflow-x:auto;border-radius:var(--r);border:1px solid var(--border);
  background:var(--surface)}
table{width:100%;border-collapse:collapse;font-size:14px;min-width:520px}
th{text-align:left;font-size:12px;text-transform:uppercase;letter-spacing:.04em;
  color:var(--muted);padding:10px 12px;border-bottom:1px solid var(--border);
  background:var(--surface-2);white-space:nowrap}
td{padding:10px 12px;border-bottom:1px solid var(--border);vertical-align:middle}
tr:last-child td{border-bottom:none}
tbody tr:hover{background:var(--surface-2)}

/* ---------- quiz cards ---------- */
.qcard{display:flex;flex-direction:column;overflow:hidden;cursor:pointer;
  transition:transform .12s,box-shadow .12s}
.qcard:hover{transform:translateY(-2px);box-shadow:0 4px 8px rgba(16,20,35,.08),
  0 16px 32px rgba(16,20,35,.10)}
.qcard .cover{aspect-ratio:16/9;background:var(--surface-2);display:grid;place-items:center;
  overflow:hidden}
.qcard .cover img{width:100%;height:100%;object-fit:cover}
.qcard .cover .ph{font-size:30px;opacity:.35}
.qcard .body{padding:13px 15px 15px;display:flex;flex-direction:column;gap:7px;flex:1}
.qcard h3{margin:0;font-size:15.5px}
.qcard .meta{font-size:12.5px;color:var(--muted)}

/* ---------- images in questions & choices ---------- */
.qimage{margin:10px 0;background:var(--surface-2);border:1px solid var(--border);
  border-radius:var(--r-sm);display:grid;place-items:center;padding:8px;max-height:340px;
  overflow:hidden;cursor:zoom-in}
.qimage img{max-height:320px;max-width:100%;width:auto;object-fit:contain;display:block}
.choice-thumb{width:120px;height:120px;flex:0 0 120px;background:var(--surface-2);
  border:1px solid var(--border);border-radius:var(--r-sm);display:grid;place-items:center;
  overflow:hidden;cursor:zoom-in}
.choice-thumb img{width:100%;height:100%;object-fit:contain}
.img-missing{color:var(--muted);font-size:12px;padding:14px;text-align:center}
.lightbox{position:fixed;inset:0;background:rgba(8,10,18,.86);z-index:200;display:grid;
  place-items:center;padding:24px;cursor:zoom-out}
.lightbox img{max-width:100%;max-height:100%;object-fit:contain;border-radius:8px}

/* ---------- taking a quiz ---------- */
.qbox{padding:20px}
.qbox .prompt{font-size:16.5px;font-weight:600;margin-bottom:4px}
.choices{display:flex;flex-direction:column;gap:9px;margin-top:12px}
.choice{display:flex;align-items:center;gap:12px;padding:11px 13px;border:1.5px solid var(--border);
  border-radius:var(--r-sm);cursor:pointer;background:var(--surface);min-height:52px}
.choice:hover{border-color:var(--brand);background:var(--brand-soft)}
.choice.sel{border-color:var(--brand);background:var(--brand-soft)}
.choice input{accent-color:var(--brand);width:17px;height:17px;flex:0 0 auto}
.choice .ctext{flex:1;min-width:0;overflow-wrap:anywhere}
.choice.correct{border-color:var(--ok);background:var(--ok-soft)}
.choice.wrong{border-color:var(--danger);background:var(--danger-soft)}
.progress{height:6px;background:var(--surface-2);border-radius:99px;overflow:hidden}
.progress > i{display:block;height:100%;background:var(--brand);transition:width .25s}
.timer{font-variant-numeric:tabular-nums;font-weight:700}
.timer.warn{color:var(--danger)}
.sticky-actions{position:sticky;bottom:0;background:var(--surface);border-top:1px solid var(--border);
  padding:12px var(--sp);margin:0 -18px -18px;display:flex;gap:10px;align-items:center;
  border-radius:0 0 var(--r) var(--r)}

/* ---------- score ring ---------- */
.score{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.score .big{font-size:2.6rem;font-weight:800;letter-spacing:-.03em;line-height:1}
.score .big.pass{color:var(--ok)} .score .big.fail{color:var(--danger)}

/* ---------- leaderboards ---------- */
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);margin-bottom:16px;
  overflow-x:auto}
.tabs button{border:none;background:none;font:inherit;font-weight:600;font-size:14px;
  color:var(--muted);padding:9px 13px;cursor:pointer;border-bottom:2px solid transparent;
  white-space:nowrap}
.tabs button.active{color:var(--brand);border-bottom-color:var(--brand)}
.lb-row{display:flex;align-items:center;gap:12px;padding:11px 14px;
  border-bottom:1px solid var(--border)}
.lb-row:last-child{border-bottom:none}
.lb-row.me{background:var(--brand-soft);border-left:3px solid var(--brand);padding-left:11px}
.lb-rank{flex:0 0 40px;font-weight:800;font-variant-numeric:tabular-nums;text-align:center;
  color:var(--muted)}
.lb-rank.r1{color:var(--gold)} .lb-rank.r2{color:var(--silver)} .lb-rank.r3{color:var(--bronze)}
.lb-name{flex:1;min-width:0;font-weight:600;overflow:hidden;text-overflow:ellipsis;
  white-space:nowrap}
.lb-sub{font-size:12.5px;color:var(--muted);font-weight:500}
.lb-score{font-weight:800;font-variant-numeric:tabular-nums}
.pinned{position:sticky;bottom:0;border-top:2px solid var(--brand);background:var(--surface)}

/* ---------- modal / toast ---------- */
.backdrop{position:fixed;inset:0;background:rgba(10,12,20,.5);z-index:100;display:grid;
  place-items:center;padding:18px;overflow-y:auto}
.modal{background:var(--surface);border-radius:var(--r);box-shadow:var(--shadow);width:100%;
  max-width:520px;max-height:90vh;overflow-y:auto}
.modal.wide{max-width:720px}
.modal header{display:flex;align-items:center;gap:10px;padding:16px 18px;
  border-bottom:1px solid var(--border)}
.modal header h2{margin:0;font-size:16px}
.modal .content{padding:18px}
.modal .content h3{margin-top:16px}
.modal .content > :first-child h3:first-child,.modal .content > h3:first-child{margin-top:0}
.modal footer{display:flex;gap:9px;justify-content:flex-end;padding:14px 18px;
  border-top:1px solid var(--border);flex-wrap:wrap}
#toasts{position:fixed;right:16px;bottom:16px;z-index:300;display:flex;flex-direction:column;
  gap:8px;max-width:min(360px,calc(100vw - 32px))}
.toast{background:var(--text);color:var(--bg);padding:11px 14px;border-radius:var(--r-sm);
  font-size:14px;box-shadow:var(--shadow);animation:pop .2s ease-out}
.toast.ok{background:var(--ok);color:#fff}
.toast.bad{background:var(--danger);color:#fff}
@keyframes pop{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---------- misc ---------- */
.empty{text-align:center;padding:46px 20px;color:var(--muted)}
.empty .ico{font-size:34px;opacity:.4;margin-bottom:8px}
.skel{padding:40px;text-align:center;color:var(--muted)}
.spin{display:inline-block;width:15px;height:15px;border:2px solid var(--border);
  border-top-color:var(--brand);border-radius:50%;animation:sp .7s linear infinite;
  vertical-align:-2px}
@keyframes sp{to{transform:rotate(360deg)}}
.pill-count{background:var(--danger);color:#fff;border-radius:999px;font-size:11px;
  padding:1px 6px;font-weight:700;margin-left:4px}
.instructions{white-space:pre-wrap;background:var(--surface-2);border:1px solid var(--border);
  border-radius:var(--r-sm);padding:13px;font-size:14px}
.editor-q{border:1px solid var(--border);border-radius:var(--r);background:var(--surface);
  margin-bottom:12px}
.editor-q > .head{display:flex;align-items:center;gap:9px;padding:10px 13px;flex-wrap:wrap;
  border-bottom:1px solid var(--border);background:var(--surface-2);
  border-radius:var(--r) var(--r) 0 0}
.editor-q > .body{padding:14px}
.editor-q.drag{opacity:.45}
.handle{cursor:grab;color:var(--muted);font-size:17px;user-select:none;padding:0 3px}
.chip{display:inline-flex;align-items:center;gap:6px;background:var(--surface-2);
  border:1px solid var(--border);border-radius:999px;padding:3px 6px 3px 11px;font-size:13px}
.chip button{border:none;background:none;cursor:pointer;color:var(--muted);font-size:15px;
  line-height:1;padding:2px 4px}
.saveflag{font-size:12.5px;color:var(--muted)}

@media (max-width:640px){
  .topbar{height:auto;padding:9px var(--sp);flex-wrap:wrap;row-gap:2px}
  .brand{flex:0 0 auto}
  #userbox{margin-left:auto;order:2}
  nav.main{order:3;flex:0 0 100%;width:100%;margin:2px -4px 0}
  main{padding:18px 0 48px}
  h1{font-size:1.35rem}
  .grid{grid-template-columns:1fr}
  .choice-thumb{width:84px;height:84px;flex-basis:84px}
  .lb-rank{flex-basis:30px}
  .modal footer{flex-direction:column-reverse}
  .modal footer .btn{width:100%}
}