:root {
  color-scheme: dark;
  --bg: #1e1e26;
  --panel: #252535;
  --panel-strong: #2b2b3a;
  --text: #d7d7e0;
  --muted: #8c8ca0;
  --accent: #8ab4f8;
  --accent-strong: #5690f8;
  --retro-bg: #111114;
  --border: rgba(255,255,255,0.08);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
  background: radial-gradient(circle at top, rgba(138, 180, 248, 0.08), transparent 30%), var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  padding: 1.5rem;
}

.app-shell {
  max-width: 1080px;
  margin: 0 auto;
  display: grid;
  gap: 1.5rem;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.05), rgba(0,0,0,0.05));
}

.topbar h1 {
  margin: 0;
  font-size: clamp(1.6rem, 2.5vw, 2.4rem);
  letter-spacing: 0.02em;
}

.status-panel {
  display: grid;
  gap: 0.55rem;
  text-align: right;
}

.status-panel p {
  margin: 0;
  color: var(--muted);
}

.content-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 1.75rem;
}

.instructions, .game-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 1.1rem;
  padding: 1.8rem;
  min-height: 520px;
  box-shadow: 0 18px 40px rgba(0,0,0,0.18);
}

.instructions h2 {
  margin-top: 0;
  font-size: 1.25rem;
}

.instructions p {
  margin: 0.85rem 0;
  line-height: 1.6;
}

.instructions strong {
  color: var(--text);
}

.cta {
  margin-top: 1rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  border: none;
  color: #fff;
  padding: 0.85rem 1.2rem;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 24px rgba(44, 101, 225, 0.2);
}

.canvas-frame {
  position: relative;
  padding: 1rem;
  border-radius: 1rem;
  background: radial-gradient(circle at top, rgba(138, 180, 248, 0.06), transparent 26%), var(--retro-bg);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.04);
}

#gameCanvas {
  width: 100%;
  height: auto;
  display: block;
  border: 3px solid #3c3c4d;
  background: #0a0a10;
  border-radius: 0.85rem;
}

.canvas-overlay {
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.canvas-overlay span {
  display: inline-block;
  margin: 0 0.2rem;
  padding: 0.1rem 0.4rem;
  border-radius: 0.35rem;
  background: rgba(255,255,255,0.05);
}

.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.7);
  z-index: 20;
}

.hidden {
  display: none;
}

.popup {
  width: min(380px, calc(100% - 3rem));
  padding: 2rem;
  border-radius: 1rem;
  background: #1d1d2a;
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: 0 24px 60px rgba(0,0,0,0.4);
  text-align: center;
}

.popup-title {
  margin: 0 0 1rem;
  font-size: 2rem;
  color: #8ab4f8;
}

.popup-message {
  margin: 0 1rem 1.5rem;
  color: var(--text);
  line-height: 1.6;
}