/* RAIDEN STAGE 1 —— 深空街机风页面样式（零依赖） */
:root {
  --bg: #05070f;
}

* {
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  background: radial-gradient(1200px 800px at 50% 38%, #0a1428 0%, var(--bg) 72%);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  overflow: hidden;
  font-family: "Courier New", Courier, monospace;
  user-select: none;
  -webkit-user-select: none;
}

/* 画布固定 640x740（游戏区 600 + 底部触屏操作台 140），按视口等比缩放显示 */
#game {
  display: block;
  width: min(100vw, calc(100vh * 640 / 740), 640px);
  height: auto;
  aspect-ratio: 640 / 740;
  background: #04060f;
  image-rendering: pixelated;
  border: 2px solid #16294d;
  border-radius: 4px;
  touch-action: none;           /* 触屏：禁用浏览器手势，交给虚拟手柄 */
  -webkit-touch-callout: none;  /* 触屏：禁用长按菜单 */
  box-shadow:
    0 0 0 1px #0a1428,
    0 0 42px rgba(56, 130, 255, 0.28),
    inset 0 0 60px rgba(0, 0, 0, 0.6);
}