/* 主题变量：整页颜色和玻璃参数 */
:root {
  color-scheme: light;
  --bg-1: #eef4ff;
  --bg-2: #f7f2eb;
  --glass-border: rgba(255, 255, 255, 0.56);
  --glass-shadow: 0 30px 80px rgba(14, 25, 49, 0.16);
  --text: #152238;
  --muted: #64758b;
  --accent: #2d7ff9;
}

/* 全局基础：统一盒模型 */
* {
  box-sizing: border-box;
}

/* 页面根元素：铺满视口高度 */
html,
body {
  height: 100%;
}

/* 页面背景：整体底色和氛围光 */
body {
  margin: 0;
  font-family: "Aptos", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: linear-gradient(135deg, var(--bg-left, #eef4ff) 0%, #ffffff 48%, var(--bg-right, #f8f9fb) 100%);
  overflow: hidden;
}

/* 页面主容器：居中布局 */
.page-shell {
  position: relative;
  min-height: 100%;
  display: grid;
  justify-items: center;
  align-items: start;
  padding: clamp(140px, 25vh, 300px) 24px 24px;
}

/* 主内容区：标题和搜索区 */
.hero {
  width: min(100%, 760px);
  display: grid;
  gap: 24px;
  z-index: 1;
  animation: rise 700ms ease-out both;
}

/* 品牌区：标题与图标 */
.brand {
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  text-align: left;
}

/* 品牌图标：左侧圆角图标块 */
.brand-mark {
  width: 62px;
  height: 62px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-size: 1.8rem;
  color: rgba(255, 255, 255, 0.98);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.5), rgba(45, 127, 249, 0.24));
  border: 1px solid rgba(255, 255, 255, 0.68);
  box-shadow:
    0 18px 38px rgba(35, 98, 190, 0.18),
    0 2px 6px rgba(255, 255, 255, 0.28) inset,
    inset 0 1px 0 rgba(255, 255, 255, 0.92),
    inset 0 -10px 18px rgba(45, 127, 249, 0.08);
  backdrop-filter: blur(24px) saturate(190%);
  -webkit-backdrop-filter: blur(24px) saturate(190%);
}

/* 品牌标题：主标题样式 */
.brand-copy h1 {
  margin: 0;
  font-size: clamp(3rem, 5vw, 3.5rem);
  letter-spacing: -0.04em;
  line-height: 1;
  color: #333333;
}

/* 品牌副标题：说明文字 */
.brand-copy p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 1rem;
}

/* 搜索卡片：输入区和联想框容器 */
.search-card {
  position: relative;
  padding: 18px;
  border-radius: 34px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.52), rgba(255, 255, 255, 0.18)),
    linear-gradient(135deg, rgba(255, 255, 255, 0.24), rgba(45, 127, 249, 0.06));
  border: 1px solid rgba(255, 255, 255, 0.72);
  box-shadow:
    0 28px 70px rgba(14, 25, 49, 0.14),
    0 1px 0 rgba(255, 255, 255, 0.9) inset,
    inset 0 -18px 32px rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(34px) saturate(210%);
  -webkit-backdrop-filter: blur(34px) saturate(210%);
  overflow: visible;
  isolation: isolate;
}

/* 搜索卡片高光：玻璃反光层 */
.search-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.52), transparent 34%, rgba(255, 255, 255, 0.08) 72%),
    radial-gradient(circle at 18% 14%, rgba(255, 255, 255, 0.38), transparent 26%);
  pointer-events: none;
  border-radius: inherit;
  z-index: 0;
}

/* 搜索行：输入框和按钮排列 */
.search-row {
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
  z-index: 1;
}

/* 搜索按钮组：百度、Bing、Google */
.search-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* 通用按钮：清空与搜索按钮基础 */
.icon-button,
.search-button {
  border: 0;
  cursor: pointer;
  font: inherit;
}

/* 清空按钮：左侧叉号 */
.icon-button {
  width: 44px;
  height: 44px;
  border-radius: 40%;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.62), rgba(255, 255, 255, 0.22)),
    linear-gradient(135deg, rgba(255, 255, 255, 0.3), rgba(45, 127, 249, 0.08));
  color: rgba(43, 58, 85, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow:
    0 12px 28px rgba(17, 27, 44, 0.1),
    0 1px 0 rgba(255, 255, 255, 0.9) inset,
    inset 0 -8px 16px rgba(255, 255, 255, 0.24);
  backdrop-filter: blur(24px) saturate(190%);
  -webkit-backdrop-filter: blur(24px) saturate(190%);
  transition: transform 160ms ease, background 160ms ease, color 160ms ease, box-shadow 160ms ease;
}

/* 清空按钮悬停态 */
.icon-button:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.56), rgba(255, 255, 255, 0.24));
  color: var(--text);
  transform: translateY(-1px) scale(1.01);
  box-shadow: 0 14px 30px rgba(17, 27, 44, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.92);
}

/* 搜索输入框：文本输入区域 */
#searchInput {
  flex: 1;
  min-width: 0;
  height: 40px;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: 1.05rem;
  padding: 0 4px;
}

/* 搜索输入框占位符 */
#searchInput::placeholder {
  color: rgba(97, 112, 138, 0.9);
}

/* 浏览器默认清除按钮：隐藏 */
#searchInput::-webkit-search-cancel-button {
  appearance: none;
}

/* 搜索按钮通用样式：图标按钮 */
.search-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 40%;
  color: rgba(255, 255, 255, 0.98);
  border: 1px solid rgba(255, 255, 255, 0.68);
  box-shadow:
    0 16px 34px rgba(17, 27, 44, 0.16),
    0 1px 0 rgba(255, 255, 255, 0.92) inset,
    inset 0 -10px 18px rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(24px) saturate(190%);
  -webkit-backdrop-filter: blur(24px) saturate(190%);
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease, border-color 160ms ease;
  position: relative;
  overflow: hidden;
}

/* 搜索按钮高光：按钮内反光层 */
.search-button::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.56), transparent 34%),
    radial-gradient(circle at 22% 20%, rgba(255, 255, 255, 0.3), transparent 32%);
  pointer-events: none;
}

/* 搜索按钮悬停态 */
.search-button:hover {
  transform: translateY(-1px) scale(1.01);
  box-shadow: 0 18px 34px rgba(17, 27, 44, 0.16), inset 0 1px 0 rgba(255, 255, 255, 0.74);
}

/* 搜索按钮尺寸：百度、Bing、Google 共用 */
.search-button-baidu,
.search-button-alt {
  width: 40px;
  height: 40px;
  padding: 0;
}

/* 百度按钮：主提交按钮 */
.search-button-baidu {
  color: rgba(255, 255, 255, 0.98);
}

/* 搜索图标：三家 logo 字体图标 */
.search-button-baidu .iconfont,
.search-button-alt .iconfont {
  font-size: 25px;
  line-height: 1;
}

/* 其他搜索引擎按钮：Bing、Google */
.search-button-alt {
  color: rgba(19, 30, 50, 0.92);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.58), rgba(255, 255, 255, 0.2)),
    linear-gradient(135deg, rgba(45, 127, 249, 0.1), rgba(255, 255, 255, 0.08));
  border-color: rgba(255, 255, 255, 0.72);
}

/* 其他搜索按钮悬停态 */
.search-button-alt:hover {
  color: var(--text);
}

/* 提示文本：输入说明 */
.hint {
  margin: 10px 6px 0;
  color: var(--muted);
  font-size: 0.92rem;
}

/* 联想词下拉框：建议列表容器 */
.suggestions {
  position: absolute;
  left: 18px;
  right: 18px;
  top: calc(100% + 10px);
  border-radius: 24px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.62), rgba(255, 255, 255, 0.3)),
    linear-gradient(135deg, rgba(45, 127, 249, 0.08), rgba(255, 255, 255, 0.08));
  border: 1px solid rgba(255, 255, 255, 0.72);
  box-shadow:
    0 20px 46px rgba(18, 34, 66, 0.12),
    0 1px 0 rgba(255, 255, 255, 0.9) inset,
    inset 0 -14px 24px rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(32px) saturate(200%);
  -webkit-backdrop-filter: blur(32px) saturate(200%);
  overflow: hidden;
  display: none;
  max-height: 340px;
  overflow-y: auto;
  z-index: 3;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.suggestions::-webkit-scrollbar {
  display: none;
}

/* 联想词下拉框：显示状态 */
.suggestions.visible {
  display: block;
}

/* 联想词条：每条建议按钮 */
.suggestion-item {
  width: 100%;
  border: 0;
  background: transparent;
  padding: 14px 16px;
  text-align: left;
  cursor: pointer;
  color: var(--text);
  font: inherit;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 联想词条图标：前缀符号 */
.suggestion-item::before {
  content: "⌕";
  color: var(--accent);
  font-size: 0.9rem;
  opacity: 0.8;
}

/* 联想词条悬停/选中态 */
.suggestion-item:hover,
.suggestion-item[aria-selected="true"] {
  background: rgba(45, 127, 249, 0.1);
}

/* 常用入口：底部快捷链接区域 */
.quick-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease;
}

/* 常用入口链接：胶囊按钮 */
.quick-links a {
  color: rgba(52, 67, 92, 0.88);
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 999px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.62), rgba(255, 255, 255, 0.22)),
    linear-gradient(135deg, rgba(255, 255, 255, 0.12), rgba(45, 127, 249, 0.06));
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow:
    0 12px 26px rgba(17, 27, 44, 0.08),
    0 1px 0 rgba(255, 255, 255, 0.92) inset,
    inset 0 -8px 14px rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(22px) saturate(190%);
  -webkit-backdrop-filter: blur(22px) saturate(190%);
  transition: transform 160ms ease, background 160ms ease, color 160ms ease, box-shadow 160ms ease;
}

/* 常用入口链接悬停态 */
.quick-links a:hover {
  color: var(--text);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.54), rgba(255, 255, 255, 0.24));
  transform: translateY(-1px);
  box-shadow: 0 16px 28px rgba(17, 27, 44, 0.11), inset 0 1px 0 rgba(255, 255, 255, 0.84);
}

/* 联想词打开时：隐藏常用入口 */
body.suggestions-open .quick-links {
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  pointer-events: none;
}

/* 仅供辅助技术读取：视觉隐藏文本 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 动画：主内容轻微上浮 */
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* 移动端适配：窄屏布局 */
@media (max-width: 640px) {
  /* 移动端页面：允许滚动 */
  body {
    overflow: auto;
  }

  /* 移动端容器：调整内边距 */
  .page-shell {
    padding: clamp(72px, 18vh, 140px) 18px 18px;
  }

  /* 移动端品牌区：上下排列 */
  .brand {
    flex-direction: column;
    text-align: center;
  }

  /* 移动端搜索行：允许换行 */
  .search-row {
    flex-wrap: wrap;
  }

  /* 移动端按钮组：占满一行 */
  .search-actions {
    width: 100%;
    justify-content: flex-end;
    flex-wrap: wrap;
  }

  /* 移动端清空按钮：保持顺序 */
  .icon-button {
    order: 2;
  }

  /* 移动端输入框：独占一行 */
  #searchInput {
    order: 0;
    width: 100%;
    flex-basis: 100%;
    padding: 0 4px;
  }

  /* 移动端搜索按钮：保持顺序 */
  .search-button {
    order: 1;
  }

  /* 移动端联想框：左右留白 */
  .suggestions {
    left: 14px;
    right: 14px;
  }
}