:root {
  --steel-gray: #2c2f33;
  --concrete-gray: #40444b;
  --electric-orange: #ff6f00;
  --caution-yellow: #ffd700;
  --deep-red: #b22222;
  --bolt-blue: #4682b4;
  --white: #ffffff;
  --carbon-black: #0d0d0d;
  --metallic-silver: #c0c0c0;
  --neon-green: #39ff14;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--steel-gray);
  color: var(--white);
}

.app { display: grid; grid-template-rows: auto 1fr auto; min-height: 100%; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: linear-gradient(180deg, #1f2124, #181a1d);
  border-bottom: 1px solid #00000066;
}
.brand { display: flex; align-items: center; gap: 10px; }
.logo { width: 28px; height: 28px; image-rendering: crisp-edges; }
.title { font-weight: 700; letter-spacing: 0.4px; }
.actions { display: flex; align-items: center; gap: 12px; }
.link { color: var(--bolt-blue); text-decoration: none; }
.link:hover { text-decoration: underline; }

.stage { position: relative; display: grid; place-items: center; padding: 16px; }
canvas#game { border: 2px solid var(--metallic-silver); background: var(--concrete-gray); border-radius: 10px; width: 100%; max-width: 960px; height: auto; }

.overlay {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
  background: linear-gradient(180deg, #2c2f3399, #2c2f33cc);
  padding: 24px;
  text-align: center;
}
.overlay.visible { display: flex; }

.cta-row { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.btn {
  background: #3a3e45;
  color: var(--white);
  border: 2px solid var(--metallic-silver);
  border-radius: 10px;
  padding: 10px 16px;
  cursor: pointer;
  font-weight: 700;
}
.btn.primary { background: var(--electric-orange); color: var(--carbon-black); border-color: #ffb36a; }
.btn:hover { filter: brightness(1.06); }

.credit { color: #e8e8e8; opacity: 0.85; margin-top: 8px; }

.board { list-style: decimal; text-align: left; max-width: 640px; margin: 0; padding-left: 24px; }
.board li { padding: 6px 0; border-bottom: 1px solid #ffffff1a; }

.name-form { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.name-form input {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #ffffff55;
  min-width: 220px;
}

.mobile-controls { display: none; gap: 16px; margin: 12px auto 0; width: 100%; max-width: 960px; justify-content: center; }
.pad { font-size: 22px; padding: 12px 22px; border-radius: 999px; border: 2px solid var(--metallic-silver); background: #3a3e45; color: var(--white); }

@media (max-width: 820px) {
  .mobile-controls { display: flex; }
}

.footer { text-align: center; font-size: 12px; color: #d6d6d6; padding: 10px; opacity: 0.8; }