/* Shared design system for index.html, present.html and admin.html.
   Tokens and the visual language are carried over unchanged from the original
   single-file quiz. Light palette on bare :root; dark only redefines tokens, so
   the toggle wins in both directions and nothing borrows the host theme. */

:root{
  --bg:#F1F6F7; --card:#fff; --ink:#0E1F2B; --mute:#51636F; --line:#C9D7DC;
  --blue:#1F6F8B; --amber:#D9781A; --ok:#1F8A5B; --bad:#C63D4A;
  --okbg:#E2F4EB; --badbg:#FBE7E9;
  --shadow:0 1px 2px rgba(14,31,43,.06);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0B1A24; --card:#122A38; --ink:#E8F1F4; --mute:#9DB3BE; --line:#24404F;
    --blue:#5BB4D1; --amber:#F2A541; --ok:#4CC38A; --bad:#F07A85;
    --okbg:#123B2D; --badbg:#3F1D24;
    --shadow:0 1px 2px rgba(0,0,0,.3);
  }
}
:root[data-theme="dark"]{
  --bg:#0B1A24; --card:#122A38; --ink:#E8F1F4; --mute:#9DB3BE; --line:#24404F;
  --blue:#5BB4D1; --amber:#F2A541; --ok:#4CC38A; --bad:#F07A85;
  --okbg:#123B2D; --badbg:#3F1D24;
  --shadow:0 1px 2px rgba(0,0,0,.3);
}

*{box-sizing:border-box}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font:17px/1.5 "Bricolage Grotesque",system-ui,-apple-system,"Segoe UI",sans-serif;
  padding-top:env(safe-area-inset-top,0px); padding-bottom:env(safe-area-inset-bottom,0px);
}

h1{font-size:clamp(2rem,9vw,3rem);line-height:1.02;font-weight:800;margin:8px 0 12px;letter-spacing:-.02em}
h2{font-size:1.3rem;line-height:1.3;font-weight:600;margin:0 0 16px}
p{margin:0 0 14px;color:var(--mute)}
a{color:var(--blue)}

/* ---------- action-potential trace strip ---------- */
.strip{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:10px 12px 6px;margin-bottom:18px}
.strip svg{display:block;width:100%;height:auto}
.strip .base{stroke:var(--line);stroke-width:1.5;stroke-dasharray:3 4}
.strip .tr{fill:none;stroke:var(--blue);stroke-width:2.2;stroke-linejoin:round;stroke-linecap:round}
.meta{display:flex;justify-content:space-between;gap:10px;font-size:.85rem;color:var(--mute);margin-top:2px}

/* ---------- controls ---------- */
.opts{display:grid;gap:10px;margin:0 0 16px}
.opt,.btn{font:inherit;text-align:left;border:2px solid var(--line);background:var(--card);color:var(--ink);border-radius:12px;padding:13px 15px;min-height:52px;cursor:pointer;width:100%}
.opt:hover:not(:disabled){border-color:var(--blue)}
.opt:focus-visible,.btn:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
.opt:disabled{cursor:default}
.opt.ok{border-color:var(--ok);background:var(--okbg)}
.opt.bad{border-color:var(--bad);background:var(--badbg)}
.opt.dim{opacity:.55}
.btn{background:var(--ink);color:var(--bg);border-color:var(--ink);text-align:center;font-weight:600}
.btn:disabled{opacity:.5;cursor:default}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line);font-weight:600}
.btn.ghost:hover:not(:disabled){border-color:var(--blue)}

/* ---------- feedback ---------- */
.fb{border-radius:12px;padding:13px 15px;margin-bottom:14px;background:var(--card);border:1px solid var(--line)}
.fb b{display:block;margin-bottom:2px}
.fb.ok b{color:var(--ok)} .fb.bad b{color:var(--bad)}
.fb span{color:var(--mute);font-size:.96rem}

.hidden{display:none !important}
.dots{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0 20px}
.dots i{width:22px;height:22px;border-radius:50%;background:var(--bad)}
.dots i.o{background:var(--ok)}
.big{font-size:3.4rem;font-weight:800;line-height:1;margin:6px 0}

/* ---------- form fields (name entry, admin login) ---------- */
label{display:block;font-size:.9rem;font-weight:600;margin-bottom:6px}
input,select{
  font:inherit;width:100%;padding:13px 15px;min-height:52px;
  border:2px solid var(--line);border-radius:12px;
  background:var(--card);color:var(--ink);
}
input::placeholder{color:var(--mute);opacity:.7}
.err{color:var(--bad);font-size:.9rem;margin:8px 0 0;min-height:1.35em}
.note{font-size:.85rem;color:var(--mute)}

/* ---------- sync status pill (offline answer queue) ---------- */
.sync{
  position:fixed;left:50%;transform:translateX(-50%);
  bottom:calc(12px + env(safe-area-inset-bottom,0px));
  font-size:.8rem;font-weight:600;padding:7px 14px;border-radius:999px;
  background:var(--card);color:var(--mute);border:1px solid var(--line);
  box-shadow:var(--shadow);z-index:10;max-width:calc(100vw - 24px);
}
.sync[data-state="ok"]{color:var(--ok)}
.sync[data-state="wait"]{color:var(--amber);border-color:var(--amber)}

@media (prefers-reduced-motion:no-preference){
  .tr{transition:d .3s}
  .spark{animation:pop .5s}
  @keyframes pop{from{transform:scale(.96)}to{transform:none}}
}

/* =================== admin panel =================== */
.wrap{max-width:1100px;margin:0 auto;padding:20px 18px 60px}
.bar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:18px}
.bar h1{margin:0;font-size:clamp(1.4rem,4vw,2rem);flex:1 1 auto}
.bar .grow{flex:1 1 200px}
.bar input,.bar select,.bar button{min-height:44px;padding:9px 13px;width:auto}

.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin-bottom:20px}
.cardbox{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 16px;box-shadow:var(--shadow)}
.cardbox b{display:block;font-size:1.9rem;font-weight:800;line-height:1.1}
.cardbox span{font-size:.8rem;color:var(--mute);text-transform:uppercase;letter-spacing:.04em}

.tablewrap{overflow-x:auto;background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}
table{border-collapse:collapse;width:100%;font-size:.94rem}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);white-space:nowrap}
th{font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;color:var(--mute);font-weight:700;cursor:pointer;user-select:none;position:sticky;top:0;background:var(--card)}
th[aria-sort]{color:var(--ink)}
tbody tr:last-child td{border-bottom:0}
tbody tr.dimmed{opacity:.45}
td.name{white-space:normal;min-width:160px;font-weight:600}
td.num{text-align:right;font-variant-numeric:tabular-nums}
.rank{color:var(--mute);font-variant-numeric:tabular-nums;width:1%}
.pill{display:inline-block;font-size:.75rem;font-weight:700;padding:3px 9px;border-radius:999px;background:var(--okbg);color:var(--ok)}
.pill.run{background:transparent;color:var(--mute);border:1px solid var(--line)}
.rowbtn{font:inherit;font-size:.8rem;padding:4px 9px;min-height:0;width:auto;border:1px solid var(--line);border-radius:8px;background:transparent;color:var(--mute);cursor:pointer}
.rowbtn:hover{border-color:var(--blue);color:var(--blue)}

/* per-question difficulty bars */
.qstats{margin-top:26px}
.qrow{display:grid;grid-template-columns:1fr 78px;gap:12px;align-items:center;padding:8px 0;border-bottom:1px solid var(--line)}
.qrow:last-child{border-bottom:0}
.qrow p{margin:0 0 5px;color:var(--ink);font-size:.9rem}
.track{height:8px;border-radius:999px;background:var(--line);overflow:hidden}
.track i{display:block;height:100%;background:var(--ok);border-radius:999px}
.qrow.weak .track i{background:var(--amber)}
.pct{text-align:right;font-variant-numeric:tabular-nums;font-weight:700;font-size:.9rem}
.pct small{display:block;font-weight:400;font-size:.72rem;color:var(--mute)}

/* =================== projector view =================== */
.present{min-height:100vh;display:grid;place-items:center;text-align:center;padding:24px}
.present h1{font-size:clamp(2.4rem,6vw,4.5rem);line-height:1;margin:0 0 10px}
.present .lede{margin:0 0 24px;font-size:clamp(1.1rem,2.2vw,1.6rem)}
#qr{background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;display:inline-block}
#qr svg{display:block;width:min(52vh,72vw);height:auto}
.url{margin-top:20px;font-weight:600;font-size:clamp(1.1rem,2.4vw,1.8rem);color:var(--blue);word-break:break-all}
.joined{margin-top:18px;font-size:clamp(1.1rem,2.6vw,1.9rem);font-weight:700}
.joined b{font-size:1.5em;color:var(--blue);font-variant-numeric:tabular-nums}
.top{margin:22px auto 0;max-width:520px;text-align:left}
.top ol{margin:0;padding:0;list-style:none;counter-reset:r}
.top li{counter-increment:r;display:flex;gap:12px;align-items:baseline;padding:7px 0;border-bottom:1px solid var(--line);font-size:clamp(.95rem,1.7vw,1.3rem)}
.top li:last-child{border-bottom:0}
.top li::before{content:counter(r);color:var(--mute);font-variant-numeric:tabular-nums;min-width:1.6em}
.top li span{flex:1;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.top li b{color:var(--blue);font-variant-numeric:tabular-nums}
.set{margin:28px auto 0;max-width:640px;font-size:.8rem;color:var(--mute);text-align:left}
.set div{display:flex;gap:8px;margin-top:6px}
.set input{flex:1;min-width:0;min-height:44px;padding:10px 12px;border-width:1px;border-radius:10px}
.set button{font:inherit;font-weight:600;padding:10px 14px;min-height:44px;width:auto;border:0;border-radius:10px;background:var(--ink);color:var(--bg);cursor:pointer}
@media print{.set{display:none}}