html, body {
  margin: 0;
  padding: 0;
  height: 100vh;
  font-family: "Segoe UI", "Helvetica Neue", "Arial", sans-serif;
  background: linear-gradient(135deg, #1f1f1f, #3c4a57, #7a8a99);
  background-size: cover;
  background-attachment: fixed;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #333;
  overflow: hidden;
  cursor: default;
}

/* ------------------ 父容器样式：液态玻璃设计 ------------------ */
.message-box {
  position: relative;
  z-index: 998;
  width: auto;               /* 宽度随内容增长 */
  max-width: none;           /* PC 端不限制最大宽度 */
  min-width: 280px;
  margin: 40px;
  padding: 25px;
  text-align: center;
  border-radius: 20px;
  border: 0px solid rgba(255,255,255,0.25);

  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(8px) saturate(180%) brightness(1.1) contrast(1.05);
  -webkit-backdrop-filter: blur(20px) saturate(180%) brightness(1.1) contrast(1.05);

  box-shadow: 0 8px 30px rgba(0,0,0,0.1);
  color: #333;
  flex-shrink: 0;

  white-space: nowrap;       /* 默认：禁止换行 */
  overflow-x: auto;          /* 超出时出现横向滚动条 */
}

/* ------------------ 响应式适配（手机端） ------------------ */
@media (max-width: 768px) {
  .message-box {
    margin: 20px;
    padding: 20px;

    max-width: 85vw;         /* 限制最大宽度为屏幕 90% */
    white-space: normal;     /* 允许换行 */
    word-break: break-word;  /* 避免长字符串撑破容器 */
    overflow-x: hidden;      /* 禁止横向滚动 */
  }
}

/* ------------------ 内部文字 ------------------ */
.message-box h1 {
  font-size: 28px;
  margin-bottom: 20px;
  color: #333;
}

.message-box p {
  font-size: 18px;
  line-height: 1.8;
  color: #444;
  margin: 10px 0;
}

/* ------------------ 类型机效果 ------------------ */
.typewriter-text::after {
  content: '|';
  animation: blink 1s infinite;
  margin-left: 4px;
}

.no-caret::after {
  content: none !important;
  animation: none !important;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes blink { 
  0%, 100% { opacity: 1; } 
  50% { opacity: 0; } 
}


/* ------------------ 动画 ------------------ */
@keyframes fadeSlideDown { 0% {opacity:0; transform:translateY(-30px);} 100%{opacity:1; transform:translateY(0);} }
@keyframes fadeInFooter { 0% {opacity:0; transform:translateY(20px);} 100% {opacity:1; transform:translateY(0);} }
@keyframes float-up {0%{transform:translateY(0) scale(1);opacity:1;}100%{transform:translateY(-30px) scale(1.5);opacity:0;}}

/* ------------------ 爱心动画 ------------------ */
.heart {
  position: fixed;   /* 改为 fixed，确保它相对于视口进行定位 */
  font-size: 16px;
  pointer-events: none;
  animation: float-up 1s ease-out forwards;
  will-change: transform, opacity; /* ⚡ 提前告知浏览器优化 */
}


input[type="text"],
textarea {
  user-select: text;
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
}



/* 禁止文本选择 */
body, body * {
  -webkit-user-select: none;  /* Safari */
  -moz-user-select: none;     /* Firefox */
  -ms-user-select: none;      /* IE10+ */
  user-select: none;          /* 标准 */
  -webkit-touch-callout: none; /* 禁止iOS长按弹出菜单 */
}

/* 禁止拖动图片或其他元素 */
img, a, button {
  -webkit-user-drag: none;
  user-drag: none;
}
/* ------------------ 背景元素 ------------------ */

/* 渐变兜底 */
body {
background: linear-gradient(135deg, #1f1f1f, #3c4a57, #7a8a99);
  );
  background-attachment: fixed;
  position: relative;
  z-index: 0;
}

/* 背景图层 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--bg) no-repeat center/cover;
  opacity: 1; /* 想要透明度可调，改这里 */
}

/* ------------------ 动态文字颜色 ------------------ */
:root {
  --dynamic-text-color: #fff;
}

h1, h2, h3, p, a, .subtitle, 
typewriter-text, .lang-dropdown a, 
.engine-dropdown div, .copyright, 
input, input::placeholder, 
button {
  color: var(--dynamic-text-color) !important;
}