/* ==========================================================
   轻搜 · 全站样式
   首页简洁 / 展示页干净清晰
   兼容策略（老版本浏览器适配）：
   1) 所有 var() 前给出具体回退值，不支持 CSS 变量的浏览器
      自动取前一条有效声明（IE / 老安卓 / 老 UC 等）；
   2) flex 间距一律用 margin 实现——iOS≤14 / Chrome≤83 不支持
      flex gap，直接用 gap 会导致元素贴在一起；
   3) 无 flex 能力的浏览器按元素默认 display 自动降级（block）；
   4) :focus-within / position:sticky / backdrop-filter / env()
      均为渐进增强，不支持的浏览器自动回退到基础样式；
   5) 输入框字号 16px，避免 iOS 聚焦时自动放大页面。
   ========================================================== */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --text: #202124;
  --text-2: #5f6368;
  --text-3: #80868b;
  --line: #e4e6eb;
  --accent: #1a73e8;
  --accent-dark: #1557b0;
  --mark-bg: #fff2b8;
  --radius: 10px;
  --maxw: 850px;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
*, *::before, *::after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  color: #202124; color: var(--text);
  background: #ffffff; background: var(--bg);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: rgba(26, 115, 232, .18);
}
a { color: #1a73e8; color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
mark { background: #fff2b8; background: var(--mark-bg); color: inherit; padding: 0 1px; border-radius: 2px; }
code {
  background: #f6f7f9; background: var(--bg-soft);
  border: 1px solid #e4e6eb; border: 1px solid var(--line);
  border-radius: 4px; padding: 1px 5px; font-size: 14px;
}

/* ---------------- 搜索框（首页/内页共用） ---------------- */
.search-form { display: flex; width: 100%; }
.search-box {
  position: relative; flex: 1 1 auto; min-width: 0;
  display: flex; align-items: center;
  background: #ffffff; background: var(--bg);
  border: 1px solid #e4e6eb; border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0 14px;
  height: 46px;
  -webkit-transition: border-color .15s, box-shadow .15s;
  transition: border-color .15s, box-shadow .15s;
}
/* 行内间距：老版本 Safari/Chrome 不支持 flex gap，用 margin 实现 */
.search-form .search-box { margin-right: 10px; }
/* 渐进增强：支持 :focus-within 的浏览器有聚焦光环；
   不支持的浏览器保留输入框自带焦点轮廓（下方不移除 outline） */
.search-box:focus-within {
  border-color: #c9d7f0;
  box-shadow: 0 1px 6px rgba(32,33,36,.12);
}
.search-box:focus-within input { outline: 0; }
.search-box .ico {
  width: 18px; height: 18px; flex: 0 0 auto;
  fill: #80868b; fill: var(--text-3); margin-right: 8px;
}
.search-box input {
  flex: 1 1 auto; min-width: 0; border: 0; background: transparent;
  font-size: 16px; color: #202124; color: var(--text); height: 100%;
}
.search-box input::-webkit-input-placeholder { color: #80868b; color: var(--text-3); }
.search-box input::placeholder { color: #80868b; color: var(--text-3); }
.search-box .clear {
  -webkit-appearance: none; appearance: none;
  border: 0; background: transparent; color: #80868b; color: var(--text-3);
  font-size: 20px; line-height: 1; cursor: pointer; padding: 0 0 0 8px;
}
.search-box .clear:hover { color: #202124; color: var(--text); }
.btn-search {
  -webkit-appearance: none; appearance: none;
  border: 0; background: #1a73e8; background: var(--accent); color: #fff;
  height: 46px; padding: 0 26px; border-radius: 999px;
  font-size: 15px; cursor: pointer; white-space: nowrap;
  -webkit-transition: background .15s;
  transition: background .15s;
}
.search-actions { flex: 0 0 auto; }
.btn-search:hover { background: #1557b0; background: var(--accent-dark); }

/* 联想下拉 */
.suggest {
  position: absolute; z-index: 40; margin-top: 6px;
  background: #fff; border: 1px solid #e4e6eb; border: 1px solid var(--line);
  border-radius: 10px; border-radius: var(--radius);
  -webkit-box-shadow: 0 6px 20px rgba(32,33,36,.14);
  box-shadow: 0 6px 20px rgba(32,33,36,.14);
  overflow: hidden; min-width: 240px;
}
.suggest .sg-item {
  display: block; padding: 9px 14px; color: #202124; color: var(--text);
  font-size: 15px; cursor: pointer; border-bottom: 1px solid #f1f2f4;
}
.suggest .sg-item:last-child { border-bottom: 0; }
.suggest .sg-item:hover, .suggest .sg-item.active { background: #f6f7f9; background: var(--bg-soft); text-decoration: none; }

/* ---------------- 首页 ---------------- */
.page-home { background: #ffffff; background: var(--bg); }
.home-wrap {
  min-height: 500px; /* 旧浏览器回退 */
  min-height: calc(100vh - 60px);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.home-center { width: 100%; max-width: 850px; text-align: center; }
.logo {
  font-size: 60px; font-weight: 700; letter-spacing: 2px;
  margin: 0 0 4px; color: #1a73e8; color: var(--accent);
}
.logo-mark { color: #1a73e8; color: var(--accent); margin-right: 6px; font-weight: 400; }
.slogan { margin: 0 0 28px; color: #80868b; color: var(--text-3); font-size: 15px; }
.home-center .search-form { justify-content: center; }
.home-stat { margin-top: 22px; color: #80868b; color: var(--text-3); font-size: 13px; }

/* ---------------- 顶部搜索条 ---------------- */
.topbar {
  position: -webkit-sticky; position: sticky; top: 0; z-index: 30;
  padding: 14px 24px;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid #e4e6eb; border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: saturate(180%) blur(6px);
  backdrop-filter: saturate(180%) blur(6px);
}
/* 顶栏内容与正文同宽居中，与结果区左边缘对齐 */
.topbar-inner {
  width: 100%;
  max-width: 850px; max-width: var(--maxw);
  margin: 0 auto;
  display: flex; align-items: center;
}
.topbar-logo {
  font-size: 22px; font-weight: 700; color: #1a73e8; color: var(--accent);
  white-space: nowrap; flex: 0 0 auto;
  margin-right: 18px; /* flex gap 替代：与 .topbar-form 的间距 */
}
.topbar-logo:hover { text-decoration: none; }
.topbar-form { flex: 1 1 0; min-width: 0; position: relative; }
.topbar-form .search-box { height: 42px; }
.topbar-form .btn-search { height: 42px; padding: 0 20px; }

/* ---------------- 结果区 ---------------- */
.results-wrap {
  max-width: 850px; max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 24px 60px;
}
.result-meta {
  color: #5f6368; color: var(--text-2); font-size: 13px;
  padding-bottom: 12px; border-bottom: 1px solid #e4e6eb; border-bottom: 1px solid var(--line);
}
.result-meta strong { color: #202124; color: var(--text); font-weight: 600; }
.tag {
  display: inline-block; font-size: 11px; color: #5f6368; color: var(--text-2);
  background: #f6f7f9; background: var(--bg-soft);
  border: 1px solid #e4e6eb; border: 1px solid var(--line);
  border-radius: 4px; padding: 0 5px; margin-left: 6px;
}
.results { list-style: none; margin: 0; padding: 0; }
.result { padding: 18px 0 4px; border-bottom: 1px solid #f1f2f4; }
.result:last-child { border-bottom: 0; }
.r-title { font-size: 19px; line-height: 1.4; margin-bottom: 3px; }
.r-title a { color: #1a0dab; }
.r-title a:hover { text-decoration: underline; }
.page-search .r-title a { color: #1558d6; }
.r-url { font-size: 13px; color: #5f6368; color: var(--text-2); margin-bottom: 4px; word-break: break-all; }
.r-domain { color: #202124; }
.r-path { color: #80868b; color: var(--text-3); }
.r-snippet { font-size: 14.5px; color: #5f6368; color: var(--text-2); line-height: 1.65; }
.r-time { font-size: 12px; color: #80868b; color: var(--text-3); margin-top: 6px; }

/* 空结果 */
.empty { padding: 34px 0; }
.empty h2 { font-size: 20px; margin: 0 0 10px; font-weight: 600; }
.empty p { color: #5f6368; color: var(--text-2); font-size: 15px; margin: 0 0 8px; }
.suggest-block { margin-top: 18px; font-size: 14px; color: #5f6368; color: var(--text-2); }
.suggest-block ul {
  list-style: none; padding: 0;
  margin: 10px -8px -8px 0; /* 负边距抵消子项 margin，保持原布局 */
  display: flex; flex-wrap: wrap;
}
.suggest-block li { margin: 0 8px 8px 0; } /* flex gap 替代 */
.suggest-block li a {
  display: inline-block; padding: 5px 12px;
  border: 1px solid #e4e6eb; border: 1px solid var(--line);
  border-radius: 999px; background: #f6f7f9; background: var(--bg-soft);
  color: #202124; color: var(--text); font-size: 14px;
}
.suggest-block li a:hover { border-color: #1a73e8; border-color: var(--accent); color: #1a73e8; color: var(--accent); text-decoration: none; }

.notice {
  margin-top: 26px; padding: 16px 18px;
  background: #f6f7f9; background: var(--bg-soft);
  border: 1px solid #e4e6eb; border: 1px solid var(--line);
  border-radius: 10px; border-radius: var(--radius);
  color: #5f6368; color: var(--text-2); font-size: 15px;
}

/* 分页（flex gap → 子项 margin） */
.pagination { display: flex; flex-wrap: wrap; margin: 26px 0 0; align-items: center; }
.pagination > * { margin: 0 6px 6px 0; }
.pg {
  min-width: 34px; text-align: center; padding: 6px 10px;
  border: 1px solid #e4e6eb; border: 1px solid var(--line); border-radius: 6px;
  font-size: 14px; color: #202124; color: var(--text); background: #fff;
}
.pg:hover { border-color: #1a73e8; border-color: var(--accent); color: #1a73e8; color: var(--accent); text-decoration: none; }
.pg.current { background: #1a73e8; background: var(--accent); border-color: #1a73e8; border-color: var(--accent); color: #fff; }
.pg-dots { color: #80868b; color: var(--text-3); padding: 0 2px; }

/* 相关搜索 */
.related { margin-top: 26px; padding-top: 16px; border-top: 1px solid #e4e6eb; border-top: 1px solid var(--line); }
.related h3 { font-size: 14px; color: #5f6368; color: var(--text-2); font-weight: 600; margin: 0 0 10px; }
.related-list { display: flex; flex-wrap: wrap; }
.chip {
  padding: 5px 12px; margin: 0 8px 8px 0; /* flex gap 替代 */
  border: 1px solid #e4e6eb; border: 1px solid var(--line); border-radius: 999px;
  background: #f6f7f9; background: var(--bg-soft);
  color: #202124; color: var(--text); font-size: 14px;
}
.chip:hover { border-color: #1a73e8; border-color: var(--accent); color: #1a73e8; color: var(--accent); text-decoration: none; }

/* ---------------- 结果页（百度式：整体靠左 + 搜索框与结果列对齐 + 右侧栏） ---------------- */
/* 仅 page-left（搜索结果页）：内容块靠左、右侧大留白；margin 下限 150 保证 logo 外挂区 */
.page-left .topbar-inner,
.page-left .footer-inner,
.page-left .results-wrap {
  max-width: min(1140px, calc(100% - 170px));
  margin-left: max(150px, calc((100% - 1160px) * 0.18));
  margin-right: auto;
}
/* 搜索框从容器左缘起（与结果列左对齐），logo 外挂到容器左侧（百度式） */
.page-left .topbar-inner { position: relative; }
.page-left .topbar-logo {
  position: absolute; right: 100%; top: 50%; transform: translateY(-50%);
  margin-right: 10px;
}
.page-left .topbar-form { max-width: calc(100% - 412px); } /* 框宽=结果列宽（右栏300+gap64+左右padding48），右缘与结果列对齐 */
.page-left .results-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 0 64px;
  align-items: start;
}
.results-col { min-width: 0; }
.sidebar { position: sticky; top: 14px; padding-top: 14px; transform: translateX(20px); } /* 右侧栏单独右移20px，不影响左列与搜索框 */
.side-box { margin-bottom: 24px; }
.side-box h3 { font-size: 15.5px; font-weight: 600; color: #202124; color: var(--text); margin: 0 0 4px; }
.side-links { list-style: none; margin: 0; padding: 0; }
.side-links li a {
  display: flex; align-items: center; gap: 7px;
  padding: 6px 0; font-size: 14px; color: #202124; color: var(--text);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.side-links li a:hover { color: #1a73e8; color: var(--accent); }
/* 相关搜索行首小放大镜（纯 CSS 圆+柄） */
.side-ico {
  flex: 0 0 auto; width: 13px; height: 13px;
  border: 1.6px solid #9aa0a6; border-radius: 50%;
  position: relative;
}
.side-ico::after {
  content: ''; position: absolute; right: -4px; bottom: -2px;
  width: 5px; height: 1.6px; background: #9aa0a6; transform: rotate(45deg);
}
/* Lume热搜 */
.side-hot { list-style: none; margin: 0; padding: 0; }
.side-hot li { display: flex; align-items: center; gap: 8px; padding: 5px 0; font-size: 14px; }
.side-hot li a {
  color: #202124; color: var(--text); min-width: 0;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.side-hot li a:hover { color: #1a73e8; color: var(--accent); }
.hot-rank {
  flex: 0 0 auto; width: 18px; text-align: center;
  font-size: 13px; font-weight: 600; color: #80868b; color: var(--text-3);
}
.hot-rank.top { color: #ea4335; }
/* 底部相关搜索仅窄屏显示（宽屏由右侧栏承担，避免重复） */
.related-mobile { display: none; }
@media (max-width: 1000px) {
  .page-left .results-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .related-mobile { display: block; }
  /* 窄屏：左边距不足以外挂 logo，回退常规流 */
  .page-left .topbar-inner,
  .page-left .footer-inner,
  .page-left .results-wrap { margin-left: 40px; max-width: min(1140px, calc(100% - 60px)); }
  .page-left .topbar-logo { position: static; transform: none; }
  .page-left .topbar-form { max-width: none; }
}
@media (max-width: 720px) {
  .page-left .topbar-inner,
  .page-left .footer-inner,
  .page-left .results-wrap { margin-left: 0; max-width: none; }
  .page-left .topbar-inner { padding: 0; }
}

/* ---------------- 内容页（关于） ---------------- */
.page-wrap { max-width: 850px; max-width: var(--maxw); margin: 0 auto; padding: 30px 24px 60px; }
.prose h1 { font-size: 26px; margin: 0 0 14px; }
.prose h2 { font-size: 19px; margin: 26px 0 10px; font-weight: 600; }
.prose p, .prose li { color: #5f6368; color: var(--text-2); font-size: 15.5px; }
.prose ul { padding-left: 20px; }

/* ---------------- 页脚 ---------------- */
.site-footer { border-top: 1px solid #e4e6eb; border-top: 1px solid var(--line); background: #ffffff; background: var(--bg); }
.footer-inner {
  max-width: 850px; max-width: var(--maxw); margin: 0 auto; padding: 18px 24px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap;
  color: #80868b; color: var(--text-3); font-size: 13px;
}
.footer-inner nav { margin-left: 12px; } /* flex gap 替代 */
.footer-inner nav a { color: #80868b; color: var(--text-3); margin-left: 14px; }
.footer-inner nav a:hover { color: #1a73e8; color: var(--accent); }

/* ---------------- 移动端 ---------------- */
@media (max-width: 720px) {
  .logo { font-size: 46px; }
  .topbar { padding: 12px 14px; }
  .topbar-logo { font-size: 19px; margin-right: 10px; }
  .results-wrap, .page-wrap { padding-left: 16px; padding-right: 16px; }
  /* 首页/内页搜索框改为竖排堆叠 */
  .search-form { flex-direction: column; }
  .search-form .search-box { margin-right: 0; }
  .search-form .search-actions { margin-top: 10px; }
  /* 顶栏内保持横排 */
  .topbar-form .search-form { flex-direction: row; }
  .topbar-form .search-form .search-box { margin-right: 10px; }
  .topbar-form .search-form .search-actions { margin-top: 0; }
  .btn-search { width: 100%; }
  .topbar-form .btn-search { width: auto; padding: 0 16px; }
  .r-title { font-size: 17px; }
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-inner nav { margin-left: 0; margin-top: 6px; }
  .footer-inner nav a:first-child { margin-left: 0; }
}

/* ===== 网址提交页 ===== */
.hint { color: #8a8f99; color: var(--text-3, #8a8f99); font-size: 13px; line-height: 1.6; margin-top: 6px; }
.sub-form { margin: 20px 0 8px; }
.sub-row { display: flex; flex-wrap: wrap; align-items: center; margin-bottom: 10px; }
.sub-row input[type=text] {
  flex: 1 1 320px; min-width: 0; max-width: 100%;
  padding: 12px 14px; border: 1px solid #e4e6eb; border: 1px solid var(--line);
  border-radius: 10px; font-size: 16px; /* ≥16px 防 iOS 聚焦缩放 */
  background: #ffffff; background: var(--bg); color: #202124; color: var(--text);
}
.sub-row input[type=text]:focus { outline: none; border-color: #1a73e8; border-color: var(--accent, #1a73e8); }
.sub-row .btn-search { -webkit-appearance: none; appearance: none; flex: 0 0 auto; height: 44px; padding: 0 22px; margin-left: 10px; }
.hp { position: absolute !important; left: -9999px !important; top: -9999px; width: 1px; height: 1px; opacity: 0; }
.sub-result { border: 1px solid #e4e6eb; border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; margin: 16px 0; font-size: 15px; line-height: 1.7; }
.sub-result.ok { background: #eef8f1; border-color: #bfe5cd; color: #14532d; }
.sub-result.err { background: #fdefee; border-color: #f5c8c5; color: #7f1d1d; }
.sub-result.info, .sub-result.dim { background: #eef4ff; border-color: #c9dbff; color: #1e3a8a; }
.sub-result-title { font-weight: 600; font-size: 15.5px; margin-bottom: 4px; }
.sub-url { font-weight: 400; word-break: break-all; }
.sub-actions { display: flex; flex-wrap: wrap; margin: 10px 0 -10px; }
.sub-actions .sub-btn { margin: 0 10px 10px 0; } /* flex gap 替代 */
.sub-btn { display: inline-block; padding: 7px 14px; border-radius: 999px; background: #1a73e8; background: var(--accent, #1a73e8); color: #fff; font-size: 14px; text-decoration: none; }
.sub-btn:hover { -webkit-filter: brightness(1.05); filter: brightness(1.05); text-decoration: none; }
.sub-btn.ghost { background: #f6f7f9; background: var(--bg-soft); color: #202124; color: var(--text); border: 1px solid #e4e6eb; border: 1px solid var(--line); }

/* 移动端提交表单竖排（全宽、易点按） */
@media (max-width: 720px) {
  .sub-row { display: block; }
  .sub-row input[type=text] { display: block; width: 100%; margin: 0 0 10px; }
  .sub-row .btn-search { display: block; width: 100%; margin: 0; height: 46px; }
  .hp { display: block; }
}

/* ==========================================================
   刘海屏/全面屏安全区（env() 需 viewport-fit=cover；
   不支持 env() 的旧浏览器整段声明无效、自动忽略，回退到上面的
   常规 padding——务必放在所有 padding 简写之后）
   ========================================================== */
.topbar {
  padding-left: calc(24px + env(safe-area-inset-left, 0px));
  padding-right: calc(24px + env(safe-area-inset-right, 0px));
}
.results-wrap, .page-wrap {
  padding-left: calc(24px + env(safe-area-inset-left, 0px));
  padding-right: calc(24px + env(safe-area-inset-right, 0px));
}
.footer-inner {
  padding-left: calc(24px + env(safe-area-inset-left, 0px));
  padding-right: calc(24px + env(safe-area-inset-right, 0px));
  padding-bottom: calc(18px + env(safe-area-inset-bottom, 0px));
}
.home-wrap {
  padding-left: calc(24px + env(safe-area-inset-left, 0px));
  padding-right: calc(24px + env(safe-area-inset-right, 0px));
}
@media (max-width: 720px) {
  .topbar {
    padding-left: calc(14px + env(safe-area-inset-left, 0px));
    padding-right: calc(14px + env(safe-area-inset-right, 0px));
  }
  .results-wrap, .page-wrap {
    padding-left: calc(16px + env(safe-area-inset-left, 0px));
    padding-right: calc(16px + env(safe-area-inset-right, 0px));
  }
}