/* Brain Master · 基础样式 / 设计令牌 */
:root {
  --bg-0: #070b18;
  --bg-1: #0d1430;
  --bg-2: #141c3d;
  /* 面板用带蓝调的玻璃，而不是纯白叠加 —— 白色叠加会让整页发灰 */
  --panel: linear-gradient(160deg, rgba(54, 72, 134, 0.5), rgba(18, 25, 54, 0.5));
  --panel-2: linear-gradient(160deg, rgba(76, 98, 172, 0.62), rgba(30, 40, 80, 0.62));
  --border: rgba(132, 166, 255, 0.2);
  --border-strong: rgba(154, 192, 255, 0.38);

  --ink: #f2f6ff;
  --ink-2: #c5d1ee;
  --ink-3: #8e9dc6;

  --c-cyan: #6ee7ff;
  --c-blue: #5b8cff;
  --c-violet: #b46bff;
  --c-pink: #ff6b9d;
  --c-amber: #ffd166;
  --c-green: #4ade80;
  --c-red: #ff5d5d;
  --c-orange: #ff9f45;

  --grad-hero: linear-gradient(135deg, #6ee7ff 0%, #5b8cff 45%, #b46bff 100%);
  --grad-pop: linear-gradient(135deg, #ffd166 0%, #ff6b9d 100%);
  --grad-cool: linear-gradient(135deg, #4ade80 0%, #6ee7ff 100%);

  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 32px;

  --shadow-1: 0 6px 18px rgba(0, 0, 0, 0.35);
  --shadow-2: 0 18px 48px rgba(0, 0, 0, 0.45);
  --glow-cyan: 0 0 24px rgba(110, 231, 255, 0.45);

  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-num: "DIN Alternate", "Bahnschrift", "SF Mono", ui-monospace, "Consolas", monospace;

  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

/* App 外壳占满一屏，页面内部滚动 —— 避免游戏区把整页撑高后反复重算尺寸 */
html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg-0);
  color: var(--ink);
  font-family: var(--font);
  overscroll-behavior: none;
}

body {
  background:
    radial-gradient(900px 620px at 10% -8%, rgba(110, 231, 255, 0.22), transparent 62%),
    radial-gradient(820px 560px at 104% 6%, rgba(180, 107, 255, 0.2), transparent 62%),
    radial-gradient(760px 620px at 50% 118%, rgba(91, 140, 255, 0.16), transparent 62%),
    linear-gradient(180deg, #05091a, #0a1130 60%, #080d20);
  background-attachment: fixed;
}

body::before {
  /* 网格底纹 */
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(circle at 50% 30%, #000 30%, transparent 78%);
  z-index: 0;
}

#app { position: relative; z-index: 1; min-height: 100%; }

button { font-family: inherit; color: inherit; border: none; background: none; cursor: pointer; }
input, select { font-family: inherit; }

h1, h2, h3, h4, p { margin: 0; }

::selection { background: rgba(110, 231, 255, 0.35); }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.14); border-radius: 99px; }
::-webkit-scrollbar-track { background: transparent; }

/* 启动动画 */
.boot {
  min-height: 60vh;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 18px;
  color: var(--ink-2);
}
.boot__brain {
  width: 76px; height: 76px; border-radius: 50%;
  background: var(--grad-hero);
  animation: pulse 1.2s ease-in-out infinite;
  box-shadow: var(--glow-cyan);
}
@keyframes pulse {
  0%, 100% { transform: scale(0.86); opacity: 0.75; }
  50% { transform: scale(1.06); opacity: 1; }
}

/* 工具类 */
.u-hide { display: none !important; }
.u-center { display: grid; place-items: center; }
.u-num { font-family: var(--font-num); font-variant-numeric: tabular-nums; }
.u-mono { font-family: var(--font-num); }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}