:root {
  --bg: #0f1115;
  --panel: #141821;
  --panel-2: #1b2130;
  --text: #e6edf3;
  --muted: #9aa7b3;
  --accent: #5ee2a0;
  --accent-2: #7bc3ff;
  --danger: #ff7b7b;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --radius: 14px;
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  background: radial-gradient(
    1200px 700px at 40% -10%,
    #18202e 0%,
    var(--bg) 40%,
    #0c0e12 100%
  );
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell,
    Noto Sans, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  display: flex;
  flex-direction: column;
}

.topbar {
  height: 56px;
  background: linear-gradient(180deg, #131824 0%, #10141f 100%);
  border-bottom: 1px solid #0b0e15;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
}
.brand {
  font-weight: 700;
  letter-spacing: 0.5px;
}
.hud {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
}
.hud strong {
  color: var(--text);
}
.hud button {
  margin-left: 8px;
}

.stage {
  flex: 1;
  display: grid;
  place-items: center;
  padding: 24px;
}

canvas#game {
  width: 800px;
  height: 600px;
  background: #0b0e14;
  border: 1px solid #0a0d13;
  border-radius: 10px;
  box-shadow: var(--shadow);
  image-rendering: crisp-edges;
  image-rendering: pixelated;
}

.overlay {
  position: absolute;
  inset: 56px 0 42px 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  pointer-events: none;
}
.overlay.show {
  display: flex;
  pointer-events: auto;
}

.panel {
  width: min(720px, 92vw);
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid #0f1422;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 24px 20px;
  text-align: center;
}
.panel.small {
  width: 420px;
}

.panel h1 {
  margin: 10px 0 8px;
  font-size: 42px;
  letter-spacing: 0.5px;
}
.panel h2 {
  margin: 6px 0 8px;
  font-size: 28px;
}
.panel p {
  margin: 8px 0 14px;
  color: var(--muted);
}
.controls {
  margin: 4px 0 14px;
  color: var(--muted);
}

.row {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.banner {
  position: absolute;
  top: 72px;
  left: 0;
  right: 0;
  margin-inline: auto;
  width: max-content;
  padding: 6px 14px;
  font-weight: 700;
  color: #0a1118;
  background: linear-gradient(180deg, #94ffd1, #48d48f);
  border-radius: 999px;
  box-shadow: 0 6px 16px rgba(94, 226, 160, 0.35);
  display: none;
}
.banner.show {
  display: inline-block;
}

.foot {
  height: 42px;
  display: grid;
  place-items: center;
  color: var(--muted);
  border-top: 1px solid #0b0e15;
}

button {
  appearance: none;
  border: 1px solid #1c2536;
  background: linear-gradient(180deg, #1a2232 0%, #141c28 100%);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 10px;
  font-weight: 700;
  letter-spacing: 0.2px;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.25);
  transition: transform 0.05s ease, filter 0.15s ease;
}
button:hover {
  filter: brightness(1.08);
}
button:active {
  transform: translateY(1px);
}
button.primary {
  border-color: #1e2f2a;
  background: linear-gradient(180deg, #45e69f 0%, #2fbf82 100%);
  color: #0a1212;
}
button.ghost {
  background: transparent;
  border-color: #2b3548;
}