:root{
  --bg-dark:#0B1E22;
  --bg-panel:#0F272C;
  --card:#122E33;
  --card-border:#1D454C;
  --teal:#2BD9C9;
  --teal-dim:#1B9E92;
  --yellow:#FFD666;
  --text:#E8F4F2;
  --text-muted:#7FA19D;
  --danger:#FF6B6B;
  --radius:10px;
  --font-ui:'Inter',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',monospace;
  --font-pixel:'Press Start 2P',monospace;
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--bg-dark);
  color:var(--text);
  font-family:var(--font-ui);
  min-height:100vh;
  overflow-x:hidden;
}
button{font-family:inherit;cursor:pointer;border:none;}
:focus-visible{outline:2px solid var(--yellow);outline-offset:2px;}

.screen{width:100%;min-height:100vh;}
.screen--hidden{display:none;}

/* ============ BILLING DASHBOARD ============ */
.app-shell{
  display:grid;
  grid-template-columns:220px 1fr;
  min-height:100vh;
}
.sidebar{
  background:var(--bg-panel);
  border-right:1px solid var(--card-border);
  padding:24px 18px;
  display:flex;
  flex-direction:column;
  gap:28px;
}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:15px;letter-spacing:.2px;}
.brand-mark{
  width:20px;height:20px;border-radius:6px;
  background:linear-gradient(135deg,var(--teal),var(--yellow));
  display:inline-block;
}
.nav{display:flex;flex-direction:column;gap:2px;}
.nav-item{
  color:var(--text-muted);
  text-decoration:none;
  font-size:13.5px;
  font-weight:500;
  padding:9px 10px;
  border-radius:8px;
}
.nav-item:hover{background:rgba(255,255,255,.04);color:var(--text);}
.nav-item--active{background:rgba(43,217,201,.12);color:var(--teal);font-weight:600;}
.sidebar-footer{margin-top:auto;font-size:11px;color:var(--text-muted);line-height:1.5;}

.main{padding:28px clamp(18px,3vw,40px) 60px;}
.topbar{
  display:flex;justify-content:space-between;align-items:flex-start;
  margin-bottom:22px;flex-wrap:wrap;gap:12px;
}
.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);margin:0 0 6px;}
.topbar h1{margin:0;font-size:clamp(20px,3vw,26px);font-weight:700;}
.acct-pill{
  font-family:var(--font-mono);font-size:12px;color:var(--text-muted);
  border:1px solid var(--card-border);padding:6px 12px;border-radius:20px;height:fit-content;
}

.banner{
  background:linear-gradient(120deg,rgba(43,217,201,.14),rgba(255,214,102,.08));
  border:1px solid var(--card-border);
  border-radius:14px;
  padding:22px clamp(16px,3vw,28px);
  display:flex;justify-content:space-between;align-items:center;gap:20px;
  margin-bottom:22px;flex-wrap:wrap;
}
.banner-kicker{color:var(--yellow);font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;margin:0 0 6px;}
.banner h2{margin:0 0 8px;font-size:clamp(20px,3.4vw,28px);}
.banner-sub{margin:0;color:var(--text-muted);font-size:13.5px;max-width:44ch;}
.banner-counter{text-align:right;}
.banner-counter-label{display:block;font-size:11px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;}
.banner-counter-number{font-family:var(--font-mono);font-weight:700;font-size:clamp(28px,4vw,40px);color:var(--teal);}

.usage-block{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  gap:14px;margin-bottom:26px;
}
.usage-card{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);padding:16px;}
.usage-label{margin:0 0 10px;font-size:12.5px;color:var(--text-muted);}
.meter{height:6px;border-radius:4px;background:rgba(255,255,255,.06);overflow:hidden;margin-bottom:8px;}
.meter-fill{height:100%;background:var(--teal);border-radius:4px;}
.meter-fill--warn{background:var(--danger);}
.usage-value{margin:0;font-family:var(--font-mono);font-size:12.5px;color:var(--text);}

.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;}
.plan-card{
  position:relative;background:var(--card);border:1px solid var(--card-border);
  border-radius:14px;padding:22px 20px;display:flex;flex-direction:column;gap:14px;
}
.plan-card--highlight{border-color:var(--teal);box-shadow:0 0 0 1px var(--teal);}
.plan-badge{
  position:absolute;top:-11px;left:20px;background:var(--teal);color:#04211E;
  font-size:10.5px;font-weight:700;padding:3px 10px;border-radius:20px;letter-spacing:.03em;
}
.plan-name{margin:0;font-weight:700;font-size:15px;}
.plan-price{margin:0;font-size:26px;font-weight:800;font-family:var(--font-mono);}
.plan-price span{font-size:13px;color:var(--text-muted);font-weight:500;}
.plan-features{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:7px;color:var(--text-muted);font-size:13px;}
.plan-features li::before{content:"✓ ";color:var(--teal);}
.plan-cta{
  margin-top:auto;background:var(--teal);color:#04211E;font-weight:700;font-size:13.5px;
  padding:11px 14px;border-radius:8px;transition:transform .12s ease, background .12s ease;
}
.plan-cta:hover{background:var(--yellow);transform:translateY(-1px);}

/* ============ TRANSITION ============ */
.transition-overlay{
  position:fixed;inset:0;background:#000;color:var(--teal);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);font-size:15px;letter-spacing:.04em;
  z-index:999;opacity:0;pointer-events:none;
}
.transition-overlay.active{
  opacity:1;pointer-events:all;
  animation:glitch-flicker .12s steps(2) infinite;
}
@keyframes glitch-flicker{
  0%{ transform:translate(0,0); filter:hue-rotate(0deg); }
  50%{ transform:translate(1px,-1px); filter:hue-rotate(30deg); }
  100%{ transform:translate(-1px,1px); filter:hue-rotate(-20deg); }
}
.transition-text{margin:0;text-shadow:2px 0 var(--danger), -2px 0 var(--teal);}

/* ============ GAME SCREEN ============ */
#game-screen{background:#0A0F1E;font-family:var(--font-pixel);}
.game-shell{max-width:900px;margin:0 auto;padding:16px;min-height:100vh;display:flex;flex-direction:column;}
.game-hud{
  display:flex;align-items:center;justify-content:space-between;
  gap:10px;margin-bottom:14px;flex-wrap:wrap;
}
.hud-title{font-size:clamp(10px,2.4vw,15px);color:var(--yellow);text-shadow:2px 2px 0 #7A5A00;}
.hud-btn{
  font-family:var(--font-pixel);font-size:10px;padding:10px 12px;border-radius:4px;
  background:var(--teal);color:#04211E;line-height:1;
}
.hud-btn--ghost{background:transparent;color:var(--text-muted);border:2px solid var(--card-border);}
.hud-btn--icon{padding:10px 12px;font-size:14px;line-height:1;}
.hud-btn--primary{background:var(--yellow);color:#3A2900;font-size:12px;padding:14px 20px;}
.hud-coin{display:flex;align-items:center;gap:6px;background:#1B1330;color:var(--yellow);border:2px solid var(--yellow);}
.coin-icon{color:var(--yellow);}
.coin-label{color:var(--text-muted);font-size:8px;}

.canvas-wrap{
  position:relative;width:100%;aspect-ratio:16/9;
  border:3px solid #2A2140;border-radius:8px;overflow:hidden;background:#101833;
}
#game-canvas{display:block;width:100%;height:100%;}

.start-overlay{
  position:absolute;inset:0;background:rgba(10,10,20,.82);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
  text-align:center;padding:20px;
}
.start-overlay--hidden{display:none;}
.start-title{font-size:clamp(14px,3vw,22px);color:var(--yellow);text-shadow:2px 2px 0 #7A5A00;margin:0;}
.start-sub{font-family:var(--font-mono);font-size:12px;color:var(--text-muted);margin:0;}

.game-footnote{
  font-family:var(--font-ui);font-size:11px;color:var(--text-muted);
  text-align:center;margin:14px 0 0;
}

/* ============ RESPONSIVE ============ */
@media (max-width:760px){
  .app-shell{grid-template-columns:1fr;}
  .sidebar{
    display:flex;flex-direction:row;align-items:center;gap:14px;
    padding:14px 16px;overflow-x:auto;
  }
  .nav{flex-direction:row;}
  .sidebar-footer{display:none;}
  .main{padding:20px 14px 50px;}
  .banner{flex-direction:column;align-items:flex-start;}
  .banner-counter{text-align:left;}
}
@media (max-width:420px){
  .hud-title{order:3;width:100%;text-align:center;}
}