* {
  box-sizing: border-box;
}

:root {
  --bg: #0b1b2a;
  --panel: #10273a;
  --panel-2: #14344d;
  --text: #eaf6ff;
  --muted: #b6d5e8;
  --accent: #85d8ff;
  --border: rgba(255, 255, 255, 0.12);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(180deg, #0b1b2a 0%, #0f2940 100%);
  color: var(--text);
}

body {
  display: flex;
}

button {
  font: inherit;
  cursor: pointer;
}

.app-shell {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 1rem;
  width: 100%;
  height: 100%;
  padding: 1rem;
}

/***********************************************/
/* Main game layout */
/***********************************************/
.game-layout {
  display: grid;
  grid-template-columns: minmax(420px, 1fr) 320px;
  gap: 1rem;
  min-height: 0;
}

.canvas-panel {
  background: rgba(16, 39, 58, 0.9);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  min-height: 0;
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  background: linear-gradient(180deg, #dff6ff 0%, #cbefff 100%);
  border-radius: 12px;
  outline: none;
}

/***********************************************/
/* Info panel on the right */
/***********************************************/
.info-panel {
  background: rgba(16, 39, 58, 0.9);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 0.4rem;
  overflow: auto;
}

.info-panel h2 {
  margin-top: 0.25rem;
  margin-bottom: 0.2;
  padding-left: 0.4rem;
  font-size: 1.1rem;
}

.info-panel ul {
  padding-left: 1.2rem;
}

.info-panel li,
.info-panel p {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.4;
  margin: 0.5rem 0 0 0;
}

.info-card {
  margin-top: 0.5rem;
  padding: 0.4rem;
  border-radius: 12px; 
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.didactic-block h4 {
  margin: 0;
  font-size: 1rem;
}

.didactic-empty {
  color: var(--muted);
  font-style: italic;
}

@media (max-width: 980px) {
  .game-layout {
    grid-template-columns: 1fr;
  }

  .info-panel {
    display: none;
  }
}