/* IQ Noodle - responsive, light/dark (#14, #15) */
:root{
  --bg:#f4f6fc; --surface:#fff; --ink:#14172b; --muted:#565c7c; --line:#dde1f0;
  --primary:#4a3fe8; --on-primary:#fff; --noodle:#ffc933; --good:#0f9a73; --bad:#d6393f;
  --shadow:0 1px 2px rgba(20,23,43,.06),0 6px 20px rgba(20,23,43,.06);
  --head:"Avenir Next Rounded","Avenir Next","Nunito","Segoe UI",system-ui,sans-serif;
  --body:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0e1120; --surface:#171b31; --ink:#eef0fb; --muted:#a0a7c9; --line:#2a3050;
  --primary:#8c84ff; --on-primary:#0e1120; --good:#2fc99b; --bad:#ff7a80; --shadow:none; color-scheme:dark;}}
:root[data-theme="dark"]{
  --bg:#0e1120; --surface:#171b31; --ink:#eef0fb; --muted:#a0a7c9; --line:#2a3050;
  --primary:#8c84ff; --on-primary:#0e1120; --good:#2fc99b; --bad:#ff7a80; --shadow:none; color-scheme:dark;}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 var(--body)}
img{max-width:100%;height:auto}
a{color:var(--primary);text-underline-offset:.15em}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--primary);outline-offset:2px;border-radius:4px}
h1,h2,h3{font-family:var(--head);font-weight:800;line-height:1.15;letter-spacing:-.01em;margin:0 0 .5em}
h1{font-size:clamp(1.9rem,4.5vw,2.8rem)}
h2{font-size:1.45rem}
h3{font-size:1.15rem}
p{margin:0 0 1em}
.skip{position:absolute;left:-999px;top:8px;background:var(--surface);padding:8px 12px;z-index:50}
.skip:focus{left:8px}

/* header */
.top{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.top-in{max-width:1180px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font:800 1.35rem var(--head)}
.brand-mark{width:38px;height:38px}
.nav{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap}
.nav a{color:var(--ink);text-decoration:none;font-weight:600;padding:8px 12px;border-radius:999px}
.nav a:hover{background:var(--bg)}
.theme-btn{border:1px solid var(--line);background:var(--bg);color:var(--ink);width:40px;height:40px;border-radius:50%;display:grid;place-items:center;cursor:pointer}

/* frame: content with optional 160px ad rails */
.frame{max-width:1180px;margin:0 auto;padding:28px 20px;display:flex;justify-content:center;gap:24px;align-items:flex-start}
.main{flex:1 1 auto;min-width:0;max-width:760px}
.rail{flex:0 0 160px;width:160px}
.rail-in{position:sticky;top:84px;min-height:600px;overflow:hidden}
@media (max-width:1179px){.rail-b{display:none}}
@media (max-width:999px){.rail-a{display:none}}
.ad-bottom{max-width:760px;margin:0 auto;padding:0 20px 28px}
.ad-fit{width:100%;overflow:hidden}
.ad-fit-in{width:728px;height:90px;transform-origin:top left}

/* content */
.prose{max-width:68ch}
.prose h2{margin-top:1.4em} .prose h3{margin-top:1.2em}
.prose img{border-radius:8px}
.prose table{border-collapse:collapse;max-width:100%;display:block;overflow-x:auto}
.prose td,.prose th{border:1px solid var(--line);padding:6px 10px}
.lead{font-size:1.15rem;color:var(--muted)}
.block{margin-top:2.4rem}
.empty,.hint{color:var(--muted)}
.hint{font-size:.9rem}
.notice{background:color-mix(in srgb,var(--noodle) 28%,var(--surface));border:1px solid var(--noodle);padding:10px 14px;border-radius:10px}
.hero{padding:12px 0 8px}
.hero h1{max-width:16ch}

/* quiz cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.qcard{--a:var(--primary);display:flex;flex-direction:column;gap:6px;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:18px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:transform .15s,border-color .15s}
.qcard:hover{transform:translateY(-3px);border-color:var(--a)}
.qcard .squig{width:64px;height:16px;color:var(--a)}
.qcard h3{margin:4px 0 0}
.qcard p{color:var(--muted);font-size:.95rem;margin:0;flex:1}
.qmeta{font-size:.85rem;color:var(--muted)}
.c1{--a:#e0a100}.c2{--a:#0f9a73}.c3{--a:#d6393f}.c4{--a:#1d86d6}.c5{--a:#a447d9}
.alist{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.alist li{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:12px 16px}
.alist a{font-weight:700;font-size:1.05rem}
.alist span{display:block;color:var(--muted);font-size:.95rem}

/* quiz */
.qhead{margin-bottom:12px}
.noodle-bar{position:sticky;top:62px;z-index:10;display:flex;align-items:center;gap:12px;background:var(--bg);padding:8px 0}
.noodle-bar svg{flex:1 1 0;min-width:0;height:20px;overflow:visible}
.noodle-bar path{fill:none;stroke-width:5;stroke-linecap:round;vector-effect:non-scaling-stroke}
.nb-track{stroke:var(--line)}
.nb-fill{stroke:var(--noodle);stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset .4s ease}
.nb-count,.nb-time{font-size:.9rem;color:var(--muted);white-space:nowrap;font-variant-numeric:tabular-nums}
.quiz{display:grid;gap:16px}
.q{border:1px solid var(--line);background:var(--surface);border-radius:18px;padding:18px;margin:0;min-width:0}
.q legend{font:700 1.12rem/1.4 var(--head);padding:0;margin-bottom:12px;float:left;width:100%}
.q legend+*{clear:both}
.qn{display:block;color:var(--muted);font:600 .85rem var(--body);margin-bottom:2px}
.opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.opt{display:block;cursor:pointer}
.opt input{position:absolute;opacity:0;pointer-events:none}
.opt span{display:block;padding:12px 14px;border:2px solid var(--line);border-radius:999px;text-align:center;font-weight:600;transition:border-color .12s,background .12s}
.opt:hover span{border-color:var(--primary)}
.opt input:checked+span{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}
.opt input:focus-visible+span{outline:3px solid var(--primary);outline-offset:2px}
.submit-row{display:flex;flex-wrap:wrap;gap:14px;align-items:flex-end;margin-top:8px}
.namefield{display:grid;gap:4px;font-weight:600;flex:1 1 220px}
input[type=text],input[type=password],input[type=email],input[type=number],textarea,select{width:100%;font:inherit;padding:10px 12px;border:2px solid var(--line);border-radius:10px;background:var(--surface);color:var(--ink)}
.btn{display:inline-block;font:700 1rem var(--head);padding:12px 22px;border-radius:999px;border:2px solid var(--primary);background:var(--primary);color:var(--on-primary);text-decoration:none;cursor:pointer}
.btn:hover{filter:brightness(1.08)}
.btn.ghost{background:transparent;color:var(--primary)}
.btn.small{padding:6px 14px;font-size:.9rem}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin:1.2rem 0}

/* result */
.result{text-align:center;padding:12px 0}
.result-for{color:var(--muted);margin-bottom:0}
.big-score{font:800 clamp(4rem,16vw,7rem)/1 var(--head);margin:.1em 0;color:var(--primary);font-variant-numeric:tabular-nums}
.result-title{font:800 1.5rem var(--head);margin-bottom:1rem}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:10px;margin:0 auto;max-width:560px}
.stats div{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:10px}
.stats dt{font-size:.85rem;color:var(--muted)} .stats dd{margin:0;font-weight:700}
.result .actions{justify-content:center}
.sig{border-radius:6px}
.code{font:.85rem/1.4 ui-monospace,Menlo,Consolas,monospace;margin-bottom:8px}

/* tables */
.tbl{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.tbl th,.tbl td{padding:8px 12px;text-align:left;border-bottom:1px solid var(--line)}
.tbl th{font-size:.85rem;color:var(--muted)}
.tbl tr:last-child td{border-bottom:0}
.tbl .num{text-align:right;font-variant-numeric:tabular-nums}
.tbl tr.me td{background:color-mix(in srgb,var(--noodle) 30%,var(--surface));font-weight:700}
.flag{vertical-align:-1px;margin-right:4px;border-radius:2px}
.pills{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 22px}
.pills a{padding:6px 14px;border:2px solid var(--line);border-radius:999px;text-decoration:none;color:var(--ink);font-weight:600}
.pills a[aria-current]{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}
.boards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,330px),1fr));gap:22px}
.board h2{font-size:1.2rem}

/* footer */
.foot{background:var(--surface);border-top:1px solid var(--line);margin-top:20px;padding:28px 20px 24px}
.foot-in{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px}
.foot h2{font-size:1rem;margin-bottom:.6em}
.foot ul{list-style:none;margin:0;padding:0;font-size:.95rem}
.foot li{margin-bottom:4px}
.copy{max-width:1180px;margin:22px auto 0;color:var(--muted);font-size:.9rem}
.amazon{max-width:1180px;margin:10px auto 0;color:var(--muted);font-size:.85rem}

@media (max-width:600px){
  body{font-size:16px}
  .frame{padding:18px 14px}
  .top-in{padding:8px 14px;gap:10px}
  .nav{order:3;width:100%;margin-left:0}
  .theme-btn{margin-left:auto}
  .opts{grid-template-columns:1fr 1fr}
  .noodle-bar{top:98px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
@media print{.top,.rail,.ad-bottom,.foot,.noodle-bar{display:none}}