:root{
  --bg:#0b1224;
  --bg2:#0f172a;
  --panel:#111827;
  --line:#1f2937;
  --ink:#e5e7eb;
  --muted:#94a3b8;
  --accent:#22d3ee;
  --primary:#6366f1;
  --good:#34d399;
  --warn:#fbbf24;
  --bad:#f87171;
  --cell:30px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:
    radial-gradient(1000px 500px at 10% -10%, #1e293b, transparent),
    radial-gradient(800px 400px at 100% 0%, #0f3a4d, transparent),
    var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Pretendard","Noto Sans KR",sans-serif;
  overflow-x:hidden;
  position:relative;
}

/* full-bleed city backdrop */
.bg-layer{
  position:fixed; inset:0; z-index:-2;
  background-size:cover; background-position:center;
  filter: blur(14px) saturate(1.05) brightness(0.55);
  transform: scale(1.06);
  opacity: 0; transition: opacity 0.6s ease;
}
.bg-layer.loaded{ opacity: 1; }
.bg-tint{
  position:fixed; inset:0; z-index:-1;
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(34,211,238,0.10), transparent),
    radial-gradient(900px 500px at 0% 100%, rgba(99,102,241,0.10), transparent),
    linear-gradient(180deg, rgba(7,11,21,0.55), rgba(7,11,21,0.78));
  pointer-events:none;
}
.bg-label{
  position:fixed; right:14px; bottom:10px; z-index:1;
  font-size:11px; color:rgba(255,255,255,0.6);
  letter-spacing:0.06em; text-transform:uppercase;
  pointer-events:none; user-select:none;
  text-shadow: 0 1px 2px rgba(0,0,0,0.6);
}

.app{max-width:1100px;margin:0 auto;padding:18px 18px 40px}

/* topbar */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 18px;border:1px solid var(--line);border-radius:14px;
  background:linear-gradient(180deg,#0f172a,#0b1224);
}
.brand{display:flex;align-items:center;gap:10px}
.brand .logo{font-size:22px;color:var(--accent);letter-spacing:-4px}
.brand .brand-logo{height:34px;width:auto;display:block;border-radius:6px}
.brand h1{margin:0;font-size:22px;letter-spacing:-0.02em}
.brand h1 em{color:var(--accent);font-style:normal}
.badge{
  display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;
  background:#082f49;color:var(--accent);border:1px solid #155e75;margin-left:6px;
}
.badge.pro{background:#1e1b4b;color:#a5b4fc;border-color:#4338ca}
nav{display:flex;gap:8px}

/* layout */
.layout{
  display:grid;gap:14px;margin-top:14px;
  grid-template-columns: 180px 1fr 180px;
}
@media (max-width: 880px){
  .layout{grid-template-columns: 1fr;}
  .side{display:grid;grid-template-columns:1fr 1fr;gap:10px}
}

.side .panel{
  border:1px solid var(--line);border-radius:12px;padding:12px;
  background:var(--panel);
}
.side h3{margin:0 0 8px;font-size:12px;letter-spacing:0.1em;color:var(--muted)}
.stats dl{display:grid;grid-template-columns:1fr 1fr;gap:6px 10px;margin:0}
.stats dt{color:var(--muted);font-size:11px}
.stats dd{margin:0;font-weight:700;font-size:18px;color:#e2e8f0}

canvas#hold,canvas#next{
  display:block;width:100%;height:auto;background:#070b15;border-radius:8px;border:1px solid var(--line);
}

/* stage */
.stage{
  position:relative;display:flex;justify-content:center;align-items:flex-start;
}
canvas#board{
  background:
    linear-gradient(180deg,#070b15,#0a1126);
  border:1px solid var(--line);
  border-radius:12px;
  box-shadow: 0 20px 60px rgba(0,0,0,.5), inset 0 0 0 1px #0b1226;
  image-rendering: pixelated;
}

.overlay{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(7,11,21,.78);backdrop-filter:blur(6px);
  border-radius:12px;
}
.overlay .card{
  text-align:center;padding:20px 22px;border:1px solid var(--line);
  background:linear-gradient(180deg,#111827,#0b1226);border-radius:14px;min-width:260px;
}
.overlay h2{margin:0 0 8px;font-size:22px;letter-spacing:-0.01em}
.overlay p{margin:0 0 14px;color:var(--muted);font-size:14px}

/* buttons */
.btn{
  appearance:none;border:1px solid var(--line);background:#0b1226;color:var(--ink);
  padding:9px 14px;border-radius:10px;cursor:pointer;font-size:14px;font-weight:600;
  transition:transform .05s ease, border-color .15s ease, background .15s ease;
}
.btn:hover{border-color:var(--accent)}
.btn:active{transform:translateY(1px)}
.btn.primary{background:linear-gradient(180deg,#6366f1,#4f46e5);border-color:#4338ca;color:#fff}
.btn.primary:hover{filter:brightness(1.08)}
.btn.ghost{background:transparent}
.btn.wide{width:100%}

/* modal */
.modal{
  position:fixed;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(2,6,14,.7);backdrop-filter:blur(8px);z-index:50;padding:16px;
}
.modal[hidden]{display:none}
.modal-card{
  position:relative;width:100%;max-width:520px;background:var(--panel);
  border:1px solid var(--line);border-radius:16px;padding:22px;
  box-shadow:0 30px 80px rgba(0,0,0,.6);
}
.modal-card h2{margin:0 0 6px;font-size:22px}
.modal-card .lead{margin:0 0 14px;color:var(--muted)}
.modal-close{
  position:absolute;top:10px;right:12px;background:transparent;border:0;color:var(--muted);
  font-size:24px;cursor:pointer;line-height:1;
}
.modal-close:hover{color:var(--ink)}

/* pay tabs */
.pay-tabs{display:flex;gap:6px;border-bottom:1px solid var(--line);margin-bottom:14px}
.pay-tabs .tab{
  appearance:none;border:0;background:transparent;color:var(--muted);
  padding:10px 14px;cursor:pointer;font-weight:600;border-bottom:2px solid transparent;
}
.pay-tabs .tab.active{color:var(--ink);border-color:var(--accent)}
.pay-panel .muted{color:var(--muted);font-size:14px;margin:0 0 12px}
.pay-panel .hint{margin:10px 0 0;color:var(--muted);font-size:12px}
.pay-panel code{background:#0b1226;border:1px solid var(--line);padding:1px 6px;border-radius:6px;font-size:12px}
.legal{margin-top:14px;color:var(--muted);font-size:11px;border-top:1px dashed var(--line);padding-top:10px}

.keys{width:100%;border-collapse:collapse}
.keys td{padding:6px 8px;border-bottom:1px solid var(--line);font-size:14px}
.keys td:first-child{color:var(--accent);font-family:ui-monospace,Menlo,Consolas,monospace;width:30%}

/* footer copyright */
.copyright{
  text-align:center;
  color:var(--muted);
  font-size:11px;
  letter-spacing:0.05em;
  padding:22px 0 6px;
  text-shadow: 0 1px 2px rgba(0,0,0,0.6);
}

/* line-clear flash */
@keyframes flash {
  0%,100%{filter:none}
  50%{filter:brightness(1.7) saturate(1.2)}
}
.flash canvas#board{animation:flash .15s ease 2}