:root{
  --bg: #0f1220;
  --panel: #151933;
  --text: #e7eaf6;
  --muted: #a7adcf;
  --accent: #61dafb;
  --border: #323a7a;
  --btn: #2a3070;
  --btn-hover: #343c8b;
  --danger: #c0392b;
  --success: #27ae60;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: radial-gradient(1200px 800px at 10% -20%, #1a1e3f 0%, #0f1220 60%);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji", sans-serif;
}

.app {
  max-width: 980px;
  margin: 24px auto;
  padding: 0 16px 40px;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}
.header h1 {
  margin: 0;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.stats {
  display: flex;
  gap: 16px;
}
.stat {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px 14px;
  min-width: 100px;
}
.stat .label {
  font-size: 12px;
  color: var(--muted);
}
.stat .value {
  font-size: 22px;
  font-weight: 700;
  margin-top: 2px;
}

.main {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 20px;
}

.game-wrapper {
  width: max-content;
  background: #0b0e1d;
  border: 6px solid #1f2553; /* visible border around the game */
  border-radius: 12px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.35), inset 0 0 0 1px rgba(255,255,255,0.025);
  padding: 8px;
}

#game {
  display: block;
  background:
    linear-gradient(transparent 29px, rgba(255,255,255,0.05) 30px),
    linear-gradient(90deg, transparent 29px, rgba(255,255,255,0.05) 30px),
    #0d1230;
  background-size: 30px 30px; /* grid hints */
  border-radius: 6px;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
}
.panel h2 {
  margin: 0 0 8px 0;
  font-size: 18px;
}
.panel ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}
.panel li { margin: 4px 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--border);
  background: var(--btn);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.05s ease;
}
.btn:hover { background: var(--btn-hover); }
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: linear-gradient(180deg, #3a7bd5, #2a5fb8);
  border-color: #234b90;
}
.btn.primary:hover {
  background: linear-gradient(180deg, #4689e3, #2f67c2);
}
.btn.secondary {
  background: #25306a;
}
.btn.danger {
  background: #7a2233;
  border-color: #9c2f40;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(5,8,20,0.66);
  backdrop-filter: blur(3px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 20;
}
.overlay.visible { display: flex; }

.overlay-card {
  width: 100%;
  max-width: 460px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  box-shadow: 0 30px 70px rgba(0,0,0,0.45);
}
.overlay-card h2 {
  margin: 0 0 6px;
  font-size: 28px;
}
.overlay-card p {
  margin: 0 0 18px;
  color: var(--muted);
}
.overlay-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 8px;
}

@media (max-width: 860px) {
  .main {
    grid-template-columns: 1fr;
  }
  .sidebar {
    order: -1;
  }
}