:root{
  --radius:20px;
  --shadow:0 14px 40px rgba(0,0,0,.12);
  --line:rgba(20,30,60,.12);
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
  --ok:#21c26b;
  --bad:#ff4a4a;
}

[data-theme="day"]{
  --bg:#f6f7fb;
  --bg2:#eef1ff;
  --text:#12162a;
  --muted:#5a678a;
  --accent:#5a58ff;
  --card:#ffffff;
  --key:#f3f4fb;
  --key2:#ffffff;
  --focus:rgba(90,88,255,.18);
  --line:rgba(20,30,60,.12);
  --shadow:0 14px 40px rgba(0,0,0,.12);
}

[data-theme="night"]{
  --bg:#0b1020;
  --bg2:#101a34;
  --text:#e7ecff;
  --muted:#98a6d8;
  --accent:#7c5cff;
  --card:#121a33;
  --key:rgba(255,255,255,.05);
  --key2:rgba(0,0,0,.18);
  --focus:rgba(124,92,255,.22);
  --line:rgba(255,255,255,.10);
  --shadow:0 14px 40px rgba(0,0,0,.35);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--font);
  background:
    radial-gradient(1200px 700px at 20% 10%, rgba(124,92,255,.18), transparent 55%),
    radial-gradient(900px 600px at 90% 25%, rgba(33,194,107,.10), transparent 55%),
    radial-gradient(900px 600px at 50% 95%, rgba(255,74,74,.08), transparent 50%),
    linear-gradient(180deg, var(--bg2), var(--bg));
  color:var(--text);
}

a{color:inherit}
.container{
  width:min(1020px, 100%);
  margin:0 auto;
  padding:16px 16px 56px;
}

.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:18px 0 12px;
}

.brand{
  display:flex; flex-direction:column; gap:3px; min-width:0;
}
.brand h1{
  margin:0;
  font-size:22px;
  font-weight:950;
  letter-spacing:.2px;
  line-height:1.1;
}
.brand p{
  margin:0;
  color:var(--muted);
  font-size:13px;
  white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
}

.actions{
  display:flex; align-items:center; gap:10px; flex-shrink:0;
}

/* topbar mobile */
@media (max-width:560px){
  .topbar{
    flex-wrap:wrap;
    align-items:flex-start;
  }
  .actions{
    width:100%;
    flex-wrap:wrap;
    justify-content:flex-start;
  }
  .actions .pill, .actions .toggle, .actions select{
    max-width:100%;
  }
  .brand{
    flex:1 1 100%;
  }
  .brand p{
    white-space:normal;
  }
}

.pill,.btn,.toggle{
  border:1px solid var(--line);
  background:rgba(255,255,255,.35);
  border-radius:999px;
  padding:9px 11px;
  font-size:12px;
  color:var(--muted);
  user-select:none;
}
[data-theme="night"] .pill,
[data-theme="night"] .btn,
[data-theme="night"] .toggle{background:rgba(0,0,0,.18)}

.pill strong{color:var(--text); font-weight:900}
.toggle{
  color:var(--text);
  font-weight:900;
  cursor:pointer;
  transition:transform .06s ease, border-color .2s ease;
}
.toggle:hover{transform:translateY(-1px); border-color:rgba(124,92,255,.45)}

.grid2{
  display:grid;
  gap:14px;
  grid-template-columns: 1.2fr .8fr;
}
@media (max-width:900px){
  .grid2{grid-template-columns:1fr}
}

.card{
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  overflow:hidden;
  background:linear-gradient(180deg, rgba(255,255,255,.65), rgba(255,255,255,.45));
}
[data-theme="night"] .card{
  background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.03));
}

.cardHeader{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:14px 16px;
  border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.35);
}
[data-theme="night"] .cardHeader{background:rgba(255,255,255,.03)}

.cardHeader h2{
  margin:0;
  font-size:14px;
  font-weight:950;
  letter-spacing:.2px;
}
.cardHeader p{
  margin:0;
  font-size:12px;
  color:var(--muted);
}

.section{
  padding:16px;
}

.levels{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap:10px;
}
@media (max-width:560px){
  .levels{grid-template-columns:repeat(2, 1fr)}
}
.lvl{
  border:1px solid var(--line);
  border-radius:14px;
  padding:12px;
  background:rgba(255,255,255,.35);
  cursor:pointer;
  text-align:left;
  transition:transform .06s ease, border-color .2s ease, background .2s ease;
}
[data-theme="night"] .lvl{background:rgba(0,0,0,.18)}
.lvl:hover{transform:translateY(-1px); border-color:rgba(124,92,255,.45)}
.lvl.active{border-color:rgba(124,92,255,.75); background:rgba(124,92,255,.10)}
.lvl b{display:block; font-weight:950}
.lvl small{display:block; margin-top:4px; font-size:12px; color:var(--muted); line-height:1.25}

.taskBox{
  margin-top:14px;
  border:1px solid var(--line);
  border-radius:16px;
  padding:14px;
  background:rgba(255,255,255,.35);
}
[data-theme="night"] .taskBox{background:rgba(0,0,0,.18)}

.task{
  font-size:52px;
  font-weight:950;
  letter-spacing:.6px;
  line-height:1;
  padding:8px 0 10px;
  word-break:break-word;
  min-height:64px;
}
@media (max-width:560px){
  .task{font-size:42px; min-height:54px}
}

.answerRow{
  display:grid;
  grid-template-columns: 1fr auto auto;
  gap:10px;
  align-items:center;
}
@media (max-width:560px){
  .answerRow{grid-template-columns: 1fr 1fr; grid-template-areas:
    "input input"
    "check skip";}
  #answer{grid-area:input}
  #checkBtn{grid-area:check}
  #skipBtn{grid-area:skip}
}

input[type="text"]{
  width:100%;
  padding:16px 14px;
  font-size:18px;
  border-radius:14px;
  border:1px solid var(--line);
  background:var(--key2);
  color:var(--text);
  outline:none;
}
input[type="text"]:focus{
  box-shadow:0 0 0 6px var(--focus);
  border-color:rgba(124,92,255,.35);
}
input[type="text"]::placeholder{color:rgba(90,103,138,.75)}
[data-theme="night"] input[type="text"]::placeholder{color:rgba(152,166,216,.65)}

.btn{
  border-radius:14px;
  padding:14px 14px;
  font-size:14px;
  color:var(--text);
  font-weight:950;
  cursor:pointer;
  transition:transform .06s ease, border-color .2s ease;
  min-width:120px;
}
.btn:hover{transform:translateY(-1px); border-color:rgba(124,92,255,.45)}
.btn.primary{
  background:rgba(124,92,255,.18);
  border-color:rgba(124,92,255,.55);
}

.stats{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:10px;
}
.stat{
  border:1px solid var(--line);
  border-radius:16px;
  padding:12px;
  background:rgba(255,255,255,.35);
}
[data-theme="night"] .stat{background:rgba(0,0,0,.18)}
.stat .k{font-size:12px; color:var(--muted)}
.stat .v{font-size:24px; font-weight:950; margin-top:4px}

.keypad{
  margin-top:14px;
  border:1px solid var(--line);
  border-radius:16px;
  padding:12px;
  background:rgba(255,255,255,.35);
}
[data-theme="night"] .keypad{background:rgba(0,0,0,.18)}
.keys{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:10px;
}
.key{
  padding:16px 0;
  border-radius:14px;
  border:1px solid var(--line);
  background:var(--key);
  font-size:20px;
  font-weight:950;
  color:var(--text);
  cursor:pointer;
  user-select:none;
  transition:transform .06s ease, border-color .2s ease;
  touch-action:manipulation;
}
.key:hover{transform:translateY(-1px); border-color:rgba(124,92,255,.45)}
.key.enter{background:rgba(124,92,255,.18); border-color:rgba(124,92,255,.55)}
.key.back{background:rgba(255,255,255,.25)}
[data-theme="night"] .key.back{background:rgba(255,255,255,.04)}

.flashOk{animation:flashOk .16s ease}
.flashBad{animation:flashBad .16s ease}
@keyframes flashOk{from{box-shadow:0 0 0 0 rgba(33,194,107,.0)} to{box-shadow:0 0 0 7px rgba(33,194,107,.18)}}
@keyframes flashBad{from{box-shadow:0 0 0 0 rgba(255,74,74,.0)} to{box-shadow:0 0 0 7px rgba(255,74,74,.16)}}

.divider{
  margin:22px 0;
  border-top:1px solid var(--line);
  opacity:.8;
}

.faq{
  display:grid;
  gap:10px;
}
details{
  border:1px solid var(--line);
  border-radius:16px;
  padding:12px 14px;
  background:rgba(255,255,255,.35);
}
[data-theme="night"] details{background:rgba(0,0,0,.18)}
summary{
  cursor:pointer;
  font-weight:900;
  list-style:none;
}
summary::-webkit-details-marker{display:none}
details p{margin:10px 0 0; color:var(--muted); line-height:1.5; font-size:14px}

.blogList{
  display:grid;
  gap:10px;
}
.blogItem{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:12px;
  padding:14px;
  border:1px solid var(--line);
  border-radius:16px;
  background:rgba(255,255,255,.35);
  text-decoration:none;
}
[data-theme="night"] .blogItem{background:rgba(0,0,0,.18)}
.blogItem:hover{border-color:rgba(124,92,255,.45)}
.blogItem h3{margin:0; font-size:14px; font-weight:950}
.blogItem p{margin:6px 0 0; color:var(--muted); font-size:13px; line-height:1.45}
.blogItem span{color:var(--muted); font-size:12px; white-space:nowrap}

.footer{
  margin-top:18px;
  color:var(--muted);
  font-size:12px;
  display:flex;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
}

.article{
  max-width:820px;
  margin:0 auto;
  padding:18px 16px 56px;
}
.article .back{
  display:inline-flex;
  gap:8px;
  align-items:center;
  text-decoration:none;
  color:var(--muted);
  font-weight:800;
  margin:10px 0 18px;
}
.article h1{margin:10px 0 8px; font-size:28px; font-weight:950}
.article p{color:var(--muted); line-height:1.65; font-size:16px}
.article ul{color:var(--muted); line-height:1.65; font-size:16px}
.article .meta{color:var(--muted); font-size:13px; margin:0 0 18px}
/* Accessibility: focus & high contrast */
:focus-visible{outline:3px solid rgba(124,92,255,.85); outline-offset:3px}
[data-contrast="high"]{
  --line:rgba(0,0,0,.35);
}
[data-theme="night"][data-contrast="high"]{
  --line:rgba(255,255,255,.35);
}
[data-contrast="high"] .card{box-shadow:0 18px 48px rgba(0,0,0,.18)}
[data-theme="night"][data-contrast="high"] .card{box-shadow:0 18px 48px rgba(0,0,0,.55)}
[data-contrast="high"] .btn,
[data-contrast="high"] .toggle,
[data-contrast="high"] .pill,
[data-contrast="high"] input[type="text"],
[data-contrast="high"] .lvl,
[data-contrast="high"] .key,
[data-contrast="high"] details,
[data-contrast="high"] .blogItem{
  border-width:2px;
}
/* Screen-reader helper */
.sr-only{
  position:absolute !important;
  width:1px; height:1px;
  padding:0; margin:-1px;
  overflow:hidden; clip:rect(0,0,0,0);
  white-space:nowrap; border:0;
}
.skip-link{
  position:absolute;
  left:12px; top:10px;
  transform:translateY(-160%);
  background:rgba(124,92,255,.20);
  border:1px solid var(--line);
  color:var(--text);
  padding:10px 12px;
  border-radius:12px;
  font-weight:900;
  text-decoration:none;
  z-index:9999;
}
.skip-link:focus{transform:translateY(0); box-shadow:0 0 0 6px var(--focus)}
@media (prefers-reduced-motion: reduce){
  *{animation:none !important; transition:none !important; scroll-behavior:auto !important}
}

/* A11y: text size + dyslexia-friendly mode */
:root{--fontScale:1}
body{font-size:calc(16px * var(--fontScale));}
[data-font="md"]{--fontScale:1}
[data-font="lg"]{--fontScale:1.125}
[data-font="xl"]{--fontScale:1.25}
[data-dyslexia="on"]{
  font-family: ui-rounded, "Atkinson Hyperlegible", "Verdana", "Arial", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  letter-spacing: .02em;
  word-spacing: .06em;
}
[data-dyslexia="on"] .taskText{letter-spacing: .04em;}


.brandLink{ text-decoration:none; color:inherit; display:flex; flex-direction:column; gap:3px; min-width:0; }
.brandLink:focus-visible{ outline:2px solid rgba(124,92,255,.55); outline-offset:4px; border-radius:12px; }

@media (max-width:520px){
  .topbar{gap:10px;}
  .actions{flex-wrap:wrap; justify-content:flex-start; width:100%;}
  .brand{max-width:100%;}
  .brand p{white-space:normal;}
}