:root{
  --bg:#0b1020;
  --card:#121a33;
  --card2:#0f1730;
  --text:#e8ecff;
  --muted:#b7c0ff;
  --accent:#7dd3fc;
  --accent2:#a7f3d0;
  --danger:#fb7185;
  --warn:#fbbf24;
  --ok:#34d399;
  --border: rgba(255,255,255,0.12);
  --shadow: 0 10px 28px rgba(0,0,0,.35);
  --radius: 18px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: var(--sans);
  color: var(--text);
  background: radial-gradient(1200px 600px at 20% 0%, rgba(125,211,252,.20), transparent 60%),
              radial-gradient(900px 500px at 90% 10%, rgba(167,243,208,.16), transparent 55%),
              radial-gradient(900px 700px at 50% 100%, rgba(251,113,133,.10), transparent 55%),
              var(--bg);
}
a{color:inherit;text-decoration:none}
.container{max-width:1100px;margin:0 auto;padding:28px 18px 60px}
.topbar{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 18px;border:1px solid var(--border);border-radius:var(--radius);
  background: linear-gradient(180deg, rgba(18,26,51,.88), rgba(18,26,51,.62));
  box-shadow: var(--shadow);
}
.brand{display:flex;align-items:center;gap:12px}
.logo{
  width:44px;height:44px;border-radius:14px;
  background: linear-gradient(135deg, rgba(125,211,252,.9), rgba(167,243,208,.85));
  display:grid;place-items:center;color:#051024;font-weight:900;
}
.brand h1{margin:0;font-size:18px;letter-spacing:.5px}
.brand .tag{margin:2px 0 0;color:var(--muted);font-size:13px}
.nav{display:flex;gap:10px;flex-wrap:wrap}
.nav a{
  padding:9px 12px;border-radius:12px;border:1px solid var(--border);
  background: rgba(15,23,48,.45);
}
.nav a:hover{border-color: rgba(125,211,252,.55);background: rgba(15,23,48,.62)}
.hero{margin:22px 0 18px;padding:18px 4px}
.hero h2{margin:0 0 8px;font-size:30px;line-height:1.15}
.hero p{margin:0;color:var(--muted);max-width:900px;font-size:15px;line-height:1.6}
.grid{
  display:grid;grid-template-columns: repeat(12, 1fr);
  gap:14px;margin-top:14px;
}
.card{
  grid-column: span 6;
  border:1px solid var(--border);border-radius:var(--radius);
  background: linear-gradient(180deg, rgba(18,26,51,.85), rgba(15,23,48,.62));
  padding:16px;box-shadow: var(--shadow);position:relative;overflow:hidden;
}
.card:hover{transform: translateY(-1px)}
.card h3{margin:0 0 8px;font-size:18px}
.card p{margin:0;color:var(--muted);font-size:14px;line-height:1.6}
.badges{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.badge{
  font-size:12px;padding:6px 9px;border-radius:999px;border:1px solid var(--border);
  background: rgba(11,16,32,.45);color: var(--muted);
}
.badge.accent{border-color: rgba(125,211,252,.50);color: #cff0ff}
.badge.green{border-color: rgba(52,211,153,.45);color: #d1fae5}
.badge.warn{border-color: rgba(251,191,36,.45);color:#fde68a}
.footer{
  margin-top:28px;color:var(--muted);font-size:13px;line-height:1.7
}
.footer .small{font-size:12px;opacity:.9}
.btnrow{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 12px;border-radius:12px;border:1px solid var(--border);
  background: rgba(15,23,48,.55);
}
.btn:hover{border-color: rgba(167,243,208,.55)}
.gameShell{
  margin-top:18px;border:1px solid var(--border);border-radius:var(--radius);
  background: linear-gradient(180deg, rgba(18,26,51,.85), rgba(15,23,48,.62));
  box-shadow: var(--shadow);overflow:hidden;
}
.gameHeader{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;align-items:center;
  padding:14px 16px;border-bottom:1px solid var(--border);
}
.gameHeader h2{margin:0;font-size:20px}
.gameHeader .hint{margin:0;color:var(--muted);font-size:13px;max-width:720px}
.gameBody{padding:16px}
.panel{
  border:1px solid var(--border);border-radius:14px;background: rgba(11,16,32,.45);
  padding:12px;margin:10px 0;
}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
label{font-size:13px;color:var(--muted)}
input[type="number"], input[type="text"], select{
  padding:9px 10px;border-radius:12px;border:1px solid var(--border);
  background: rgba(15,23,48,.55);color: var(--text);outline:none;
}
button{
  padding:10px 12px;border-radius:12px;border:1px solid var(--border);
  background: rgba(125,211,252,.16);color: var(--text);cursor:pointer;
}
button:hover{border-color: rgba(125,211,252,.55)}
button.secondary{background: rgba(167,243,208,.12)}
button.danger{background: rgba(251,113,133,.14)}
kbd{
  font-family: var(--mono);background: rgba(255,255,255,.10);
  padding:2px 6px;border-radius:8px;border:1px solid rgba(255,255,255,.14);
}
hr{border:0;border-top:1px solid var(--border);margin:14px 0}
.mathInsight{
  border:1px solid rgba(167,243,208,.35);
  background: radial-gradient(700px 240px at 10% 0%, rgba(167,243,208,.16), transparent 60%),
              rgba(11,16,32,.45);
  border-radius:14px;padding:12px
}
.mathInsight h3{margin:0 0 8px;font-size:15px}
.mathInsight ul{margin:0 0 0 18px;color:var(--muted);line-height:1.65}
.notice{color:var(--muted);font-size:13px;line-height:1.6}
.canvasWrap{display:flex;gap:14px;flex-wrap:wrap}
canvas{max-width:100%;border-radius:14px;border:1px solid var(--border);background: rgba(0,0,0,.25)}
@media (min-width: 820px){
  .card{grid-column: span 4;}
}
/* KUBBU V2 platform layer */
.sectionTitle{display:flex;justify-content:space-between;align-items:end;gap:14px;margin:28px 0 12px}.sectionTitle h2{margin:0;font-size:20px}.sectionTitle p{margin:0;color:var(--muted);font-size:13px}.dailyHero{display:grid;grid-template-columns:1.35fr .65fr;gap:14px;margin-top:22px}.dailyMain,.statPanel{border:1px solid var(--border);border-radius:24px;background:linear-gradient(160deg,rgba(18,26,51,.95),rgba(15,23,48,.72));box-shadow:var(--shadow)}.dailyMain{padding:28px;position:relative;overflow:hidden}.dailyMain:after{content:'✦';position:absolute;right:24px;top:10px;font-size:110px;opacity:.06}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.16em;color:var(--accent2);font-weight:800}.dailyMain h2{font-size:34px;margin:8px 0 8px}.dailyMain p{max-width:620px;color:var(--muted);line-height:1.65}.primary{background:linear-gradient(135deg,rgba(125,211,252,.95),rgba(167,243,208,.92));color:#061126;border:0;font-weight:900}.statPanel{padding:18px;display:grid;grid-template-columns:1fr 1fr;gap:10px}.statBox{padding:16px;border:1px solid var(--border);border-radius:16px;background:rgba(11,16,32,.45)}.statBox b{display:block;font-size:24px}.statBox span{font-size:12px;color:var(--muted)}.gameTile{min-height:170px;display:flex;flex-direction:column;justify-content:space-between}.gameIcon{font-size:30px}.gameTile .playLabel{font-size:12px;color:var(--accent2);font-weight:800;letter-spacing:.06em}.quickGrid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.quickGrid .card{grid-column:auto}.puzzleBoard{display:grid;gap:8px;max-width:440px;margin:18px auto}.puzzleCell{aspect-ratio:1;border-radius:14px;border:1px solid var(--border);background:rgba(255,255,255,.06);display:grid;place-items:center;font-weight:900;font-size:20px;user-select:none}.puzzleCell.on{background:linear-gradient(135deg,rgba(125,211,252,.95),rgba(167,243,208,.9));color:#071126;box-shadow:0 0 28px rgba(125,211,252,.15)}.puzzleCell.path{background:rgba(125,211,252,.12)}.puzzleCell.selected{outline:2px solid var(--accent2)}.successBox{padding:16px;border-radius:16px;border:1px solid rgba(52,211,153,.45);background:rgba(52,211,153,.09);margin-top:12px}.hidden{display:none!important}.miniMeta{display:flex;gap:8px;flex-wrap:wrap;color:var(--muted);font-size:12px}.brand .tag.v2tag{font-size:12px}.footer strong{color:var(--text)}
@media(max-width:760px){.dailyHero{grid-template-columns:1fr}.quickGrid{grid-template-columns:1fr 1fr}.dailyMain h2{font-size:28px}.brand .tag{display:none}}
@media(max-width:520px){.quickGrid{grid-template-columns:1fr}.statPanel{grid-template-columns:1fr 1fr}.container{padding:14px 12px 40px}.topbar{padding:12px}.nav a{padding:8px 9px}}