:root {
  --bg: #070a12;
  --panel: rgba(10, 16, 30, 0.72);
  --text: #e9eefc;
  --muted: rgba(233, 238, 252, 0.75);
  --accent: #7aa2ff;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: radial-gradient(1200px 800px at 50% 10%, #101a35, var(--bg));
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica,
    Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

#app {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

#game {
  display: block;
  width: 100%;
  height: 100%;
}

#overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  pointer-events: none;
}

.overlay-card {
  width: min(620px, 100%);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 22px 20px;
  backdrop-filter: blur(10px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  pointer-events: auto;
}

.overlay-title {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: 0.2px;
  margin: 0 0 10px;
}

.overlay-subtitle {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.35;
}

.overlay-list {
  margin: 0;
  padding-left: 18px;
  color: var(--text);
  line-height: 1.5;
}

.kbd {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.06);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 0.95em;
}

.overlay-cta {
  margin-top: 16px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(122, 162, 255, 0.18);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
}

.btn:focus-visible {
  outline: 3px solid rgba(122, 162, 255, 0.55);
  outline-offset: 3px;
}

.hint {
  font-size: 13px;
  color: var(--muted);
  margin-top: 10px;
}