/* Theme tokens */
:root {
  --bg-0: #05060a;
  --bg-1: #0a0c14;
  --grid: rgba(0, 255, 255, 0.08);
  --glass: rgba(255, 255, 255, 0.06);
  --glass-strong: rgba(255, 255, 255, 0.12);
  --primary: #00e5ff;
  --accent: #ff00d4;
  --lime: #b7ff1a;
  --text: #e6f7ff;
  --muted: #9ab4c3;
  --shadow: 0 0 20px rgba(0, 229, 255, 0.35), 0 0 40px rgba(255, 0, 212, 0.16);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Rajdhani", ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft Yahei", sans-serif;
  background: var(--bg-0);
  color: var(--text);
  overflow: hidden;
}

.app { position: relative; height: 100%; width: 100%; }

/* Background layers */
.bg { position: absolute; inset: 0; overflow: hidden; }
#bg-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.bg-gradient {
  position: absolute; inset: 0;
  background: radial-gradient(1200px 600px at 70% 110%, rgba(0, 229, 255, 0.12), transparent 60%),
              radial-gradient(900px 500px at 20% 120%, rgba(255, 0, 212, 0.10), transparent 60%),
              linear-gradient(180deg, var(--bg-1), var(--bg-0));
  pointer-events: none;
}
.bg-grid {
  position: absolute; inset: 0; opacity: 0.5; mix-blend-mode: screen; pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 40px 40px, 40px 40px;
  mask-image: radial-gradient(circle at 50% 60%, black 60%, transparent 100%);
}

/* HUD */
.hud {
  position: relative; z-index: 3; display: grid; grid-template-columns: 1fr auto auto; gap: 16px;
  align-items: center; padding: 12px 16px; backdrop-filter: blur(6px);
}
.brand { display: flex; flex-direction: column; gap: 2px; }
.brand .logo { font-weight: 700; letter-spacing: 2px; color: var(--primary); text-shadow: 0 0 14px rgba(0,229,255,.55); }
.brand .subtitle { font-size: 12px; color: var(--muted); }
.stats { display: grid; grid-auto-flow: column; gap: 18px; }
.stat { display: grid; }
.stat label { font-size: 12px; color: var(--muted); }
.stat span { font-size: 20px; letter-spacing: 1px; }
.actions { display: grid; grid-auto-flow: column; gap: 8px; }

.btn { border: 1px solid var(--primary); background: rgba(0, 229, 255, 0.06); color: var(--text); padding: 8px 16px; border-radius: 10px; cursor: pointer; transition: 120ms ease; }
.btn:hover { box-shadow: var(--shadow); transform: translateY(-1px); }
.btn.primary { background: linear-gradient(90deg, rgba(0, 229, 255, 0.18), rgba(255, 0, 212, 0.18)); border-color: transparent; }
.btn.ghost { border-color: rgba(255,255,255,0.2); background: rgba(255,255,255,0.04); }
.btn:active { transform: translateY(0); filter: brightness(1.05); }

/* Stage */
.stage { position: absolute; inset: 0; top: 56px; z-index: 1; display: grid; place-items: center; }
.game { width: 100%; height: calc(100% - 0px); display: block; }

/* Panels */
.panel { position: absolute; inset: 0; z-index: 4; display: none; align-items: center; justify-content: center; padding: 24px; }
.panel.show { display: flex; }
.panel-card { width: min(560px, 92vw); background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02)); border: 1px solid rgba(255,255,255,0.16); border-radius: 16px; padding: 20px; box-shadow: 0 8px 40px rgba(0,0,0,0.4), inset 0 0 80px rgba(0,229,255,0.06); backdrop-filter: blur(10px); text-align: center; }
.panel-card h1, .panel-card h2 { margin: 6px 0 8px; letter-spacing: 1px; text-shadow: 0 0 24px rgba(255,0,212,0.25); }
.panel-card .tagline { color: var(--muted); margin: 0 0 16px; }

.start-form { display: grid; gap: 12px; margin: 8px auto 14px; width: min(420px, 96%); }
.start-form .row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 8px 10px; background: var(--glass); border: 1px solid rgba(255,255,255,0.12); border-radius: 12px; }
.start-form label { color: var(--muted); }
.start-form select { background: rgba(0,0,0,0.3); color: var(--text); border: 1px solid rgba(255,255,255,0.18); border-radius: 8px; padding: 6px 10px; }

/* Toggle switch */
.switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.switch input { display:none; }
.slider { position: absolute; cursor: pointer; inset: 0; background: rgba(255,255,255,0.18); transition: .2s; border-radius: 24px; box-shadow: inset 0 0 14px rgba(0,0,0,0.4); }
.slider:before { position: absolute; content: ""; height: 18px; width: 18px; left: 3px; top: 3px; background: var(--primary); border-radius: 50%; transition: .2s; box-shadow: 0 0 16px rgba(0,229,255,0.55); }
input:checked + .slider { background: rgba(0,229,255,0.25); }
input:checked + .slider:before { transform: translateX(20px); background: var(--accent); box-shadow: 0 0 16px rgba(255,0,212,0.55); }

.tips { color: var(--muted); font-size: 14px; }

/* Over panel */
.over-stats { display: grid; grid-auto-flow: column; gap: 18px; justify-content: center; margin: 6px 0 14px; }
.over-stats div { background: var(--glass); border: 1px solid rgba(255,255,255,0.14); padding: 10px 14px; border-radius: 12px; }
.over-stats label { color: var(--muted); font-size: 12px; display: block; }
.over-actions { display: grid; grid-auto-flow: column; gap: 10px; justify-content: center; }

/* DPad */
.dpad { position: absolute; z-index: 3; left: 16px; bottom: 16px; display: grid; place-items: center; gap: 6px; opacity: 0.95; }
.dpad .row { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 6px; }
.pad { width: 56px; height: 56px; border-radius: 12px; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.16); color: var(--text); font-size: 18px; text-shadow: 0 0 8px rgba(0,229,255,0.5); }
.pad:active { background: rgba(0,229,255,0.22); box-shadow: var(--shadow); }

@media (min-width: 980px) {
  .dpad { display: none; }
}

/* Small screens */
@media (max-width: 480px) {
  .hud { grid-template-columns: 1fr auto; grid-template-areas: "brand actions" "stats stats"; row-gap: 6px; }
  .brand { grid-area: brand; }
  .stats { grid-area: stats; justify-content: start; }
  .actions { grid-area: actions; justify-content: end; }
}