/* ==========================================================================
   关于本站 · 独立样式表（千纸鹤情感网 2026-10-10 生成）
   本文件自包含：全站基础层 + 本页专属样式，不依赖任何其他 CSS 文件。

   为什么每页独立：原先所有页面共用 /工具页基础层，改任一页的基础样式会同时
   影响另外 6 页 —— 2026-10-10 mp3jj「跑偏」事故即由此产生。

   维护方式：
     · 只调本页外观 → 直接改本文件下半部分「本页专属样式」段
     · 要改所有页面的基础层（如顶栏、页脚）→ 改 工具页基础层
       后重新运行 tools/build_page_css.py 一键重生成全部
   ========================================================================== */


/* ============================================================
   在线工具网 公共样式  (tool.xinwenzhan.com)
   千纸鹤情感网 2026-10-09 全面升级
   - PC 端宽大清晰（内容区最大 1320px / 更大的字号与留白）
   - 手机端自适应（单列 / 触控友好 / 安全区适配）
   - 统一页脚（关于本站 / 联系我们 / 免责声明 / 隐私政策 / ICP 备案）
   - 微信内置浏览器提示条
   注意：类名一律带站点前缀（.site-* / .home-* / .wb-*），
     避免与各工具页自身的 .wrap / .card / .brand 等类名冲突
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  /* 内容最大宽度：PC 端加宽，保证大屏下不显局促 */
  --wb-maxw: 1320px;
  /* 工具页左右内边距（顶栏靠负边距抵消，见 .site-header） */
  --page-pad-x: 20px;
  /* 品牌色 */
  --wb-blue: #2563eb;
  --wb-purple: #7c3aed;
  --wb-ink: #0f172a;
  --wb-body: #1f2937;
  --wb-sub: #64748b;
  --wb-line: #e7eaf1;
  --wb-bg-soft: #f8fafc;
  /* PC 端基础字号（手机端在下方媒体查询里降一档） */
  --wb-fs-base: 16px;
}

@media (max-width: 560px) { :root { --page-pad-x: 10px; --wb-fs-base: 15px; } }
body.home { --page-pad-x: 0px; }

*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: #ffffff;
  color: var(--wb-body);
  font-size: var(--wb-fs-base);
  line-height: 1.75;                 /* 加大行高，PC 端更易读 */
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* 无障碍隐藏（仅供搜索引擎/读屏，不占视觉空间） */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* PC 端宽大布局：把各工具页的 .wrap 容器统一放宽并居中。
   各工具页结构不一（有 .wrap / .home-wrap / 无容器），
   这里用「视口居中 + 最大宽」的方式覆盖，不改动各页 HTML 结构。 */
.wrap {
  max-width: var(--wb-maxw) !important;
  margin-left: auto !important;
  margin-right: auto !important;
  padding-left: 24px !important;
  padding-right: 24px !important;
  width: 100%;
}
@media (max-width: 560px) {
  .wrap { padding-left: 12px !important; padding-right: 12px !important; }
}

/* ---------- 顶部导航 ---------- */
body:not(.home) { padding-top: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--wb-line);
  box-shadow: 0 1px 12px rgba(31, 41, 55, .04);
  align-self: stretch;
  width: auto;
  margin-left: calc(-1 * var(--page-pad-x, 0px));
  margin-right: calc(-1 * var(--page-pad-x, 0px));
}
.site-header__inner {
  max-width: var(--wb-maxw);
  margin: 0 auto;
  padding: 12px 24px;                 /* PC 端内边距加大 */
  display: flex;
  align-items: center;
  gap: 20px;
}
@media (max-width: 560px) {
  .site-header__inner { padding: 9px 12px; gap: 10px; }
}
.site-header .brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 21px;                    /* PC 端品牌字加大 */
  letter-spacing: .5px;
  color: var(--wb-ink);
  text-decoration: none;
  white-space: nowrap;
  flex: 0 0 auto;
}
.site-header .brand .logo {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--wb-blue), var(--wb-purple));
  display: grid; place-items: center;
  color: #fff; font-size: 18px; font-weight: 900;
  box-shadow: 0 4px 12px rgba(37, 99, 235, .35);
}
.site-header .brand b {
  background: linear-gradient(135deg, var(--wb-blue), var(--wb-purple));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;                           /* 间距加大，PC 端不挤 */
  flex: 1 1 auto;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.site-nav::-webkit-scrollbar { display: none; }
.site-nav a {
  flex: 0 0 auto;
  padding: 9px 16px;                  /* PC 端导航按钮加大 */
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  color: #475569;
  text-decoration: none;
  white-space: nowrap;
  transition: .16s;
}
.site-nav a:hover { color: var(--wb-blue); background: #eef2ff; }
.site-nav a.active {
  color: #fff;
  background: linear-gradient(135deg, var(--wb-blue), var(--wb-purple));
  box-shadow: 0 4px 12px rgba(37, 99, 235, .3);
}
/* 手机端导航横向滚动时的左右渐隐提示 */
@media (max-width: 860px) {
  .site-nav {
    -webkit-mask-image: linear-gradient(90deg, #000 88%, transparent 100%);
    mask-image: linear-gradient(90deg, #000 88%, transparent 100%);
  }
}

/* ---------- 首页布局 ---------- */
.home-wrap { max-width: var(--wb-maxw); margin: 0 auto; padding: 0 24px; }
.home-section { padding: 48px 0; }
@media (max-width: 560px) { .home-wrap { padding: 0 12px; } .home-section { padding: 30px 0; } }
.muted { color: var(--wb-sub); }

/* ---------- 首页 Hero ---------- */
.hero {
  background:
    radial-gradient(900px 380px at 12% -10%, rgba(37, 99, 235, .10), transparent 60%),
    radial-gradient(800px 360px at 95% 0%, rgba(124, 58, 237, .10), transparent 55%),
    #ffffff;
  border-bottom: 1px solid #eef1f6;
  padding: 68px 0 56px;
}
@media (max-width: 560px) { .hero { padding: 44px 0 36px; } }
.hero__inner { max-width: 940px; margin: 0 auto; text-align: center; padding: 0 24px; }
@media (max-width: 560px) { .hero__inner { padding: 0 14px; } }
.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(32px, 5.2vw, 52px);
  font-weight: 900;
  letter-spacing: -.5px;
  background: linear-gradient(120deg, #1e3a8a, var(--wb-blue) 45%, var(--wb-purple));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead {
  margin: 0 auto 30px;
  max-width: 680px;
  font-size: clamp(15.5px, 2vw, 19px);
  color: #475569;
  line-height: 1.8;
}
.hero__search {
  display: flex; max-width: 620px; margin: 0 auto;
  background: #fff; border: 1px solid #dbe2ef; border-radius: 16px;
  box-shadow: 0 10px 30px rgba(31, 41, 55, .08);
  overflow: hidden;
}
.hero__search input {
  flex: 1; min-width: 0; border: 0; outline: 0; padding: 17px 20px;
  font-size: 16px; background: transparent;
}
.hero__search button {
  border: 0; background: linear-gradient(135deg, var(--wb-blue), var(--wb-purple));
  color: #fff; padding: 0 28px; font-size: 16px; font-weight: 700; cursor: pointer;
}
.hero__chips {
  margin: 20px auto 0; display: flex; flex-wrap: wrap; gap: 10px; justify-content: center;
  max-width: 820px;
}
.hero__chips a {
  font-size: 14px; font-weight: 600; color: #475569; text-decoration: none;
  background: rgba(255, 255, 255, .8); border: 1px solid #e2e8f0;
  border-radius: 999px; padding: 8px 16px; transition: .16s;
}
.hero__chips a:hover { color: var(--wb-blue); border-color: #c7d2fe; background: #fff; }

/* ---------- 首页分类 ---------- */
.cat-title {
  display: flex; align-items: center; gap: 12px;
  margin: 10px 0 22px; font-size: 22px; font-weight: 800; color: var(--wb-ink);
}
.cat-title .bar { width: 5px; height: 24px; border-radius: 3px;
  background: linear-gradient(180deg, var(--wb-blue), var(--wb-purple)); }
.cat-title small { font-size: 14px; font-weight: 500; color: #94a3b8; }

/* PC 端卡片更大更清楚；手机端自动收窄 */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}
.tool-card {
  position: relative;
  display: block;
  background: #fff;
  border: 1px solid #eef1f6;
  border-radius: 18px;
  padding: 26px 24px;
  text-decoration: none;
  color: inherit;
  transition: transform .18s, border-color .18s, box-shadow .18s;
  overflow: hidden;
}
.tool-card::after {
  content: ""; position: absolute; inset: 0; border-radius: 18px;
  background: linear-gradient(135deg, rgba(37,99,235,.06), rgba(124,58,237,.06));
  opacity: 0; transition: .18s; pointer-events: none;
}
.tool-card:hover { transform: translateY(-4px); border-color: #c7d2fe;
  box-shadow: 0 18px 40px rgba(37, 99, 235, .14); }
.tool-card:hover::after { opacity: 1; }
.tool-card .ic {
  width: 56px; height: 56px; border-radius: 15px;
  display: grid; place-items: center; font-size: 28px;
  background: linear-gradient(135deg, #eef2ff, #f5f3ff);
  border: 1px solid #e6e9f7; margin-bottom: 16px;
}
.tool-card h3 { margin: 0 0 8px; font-size: 19px; font-weight: 800; color: var(--wb-ink); }
.tool-card p { margin: 0; font-size: 14.5px; color: var(--wb-sub); min-height: 42px; line-height: 1.75; }
.tool-card .go {
  margin-top: 16px; font-size: 14px; font-weight: 700; color: var(--wb-blue);
  display: inline-flex; align-items: center; gap: 5px;
}

/* ============================================================
   统一页脚（千纸鹤情感网 2026-10-09 新增）
   结构：.wb-footer > .wb-footer__inner > 4 个信息块 + 底部版权行
   ============================================================ */
.wb-footer {
  margin-top: 44px;
  border-top: 1px solid var(--wb-line);
  background: linear-gradient(180deg, #fbfcfe, #f6f8fc);
  padding: 44px 0 0;
  color: var(--wb-sub);
  font-size: 14.5px;
  line-height: 1.8;
}
.wb-footer__inner {
  max-width: var(--wb-maxw);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr;
  gap: 36px;
}
@media (max-width: 900px) {
  .wb-footer__inner { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 560px) {
  .wb-footer { padding-top: 32px; }
  .wb-footer__inner { grid-template-columns: 1fr; gap: 22px; padding: 0 14px; }
}
.wb-footer h4 {
  margin: 0 0 12px;
  font-size: 15.5px;
  font-weight: 800;
  color: var(--wb-ink);
  display: flex; align-items: center; gap: 7px;
}
.wb-footer h4::before {
  content: ""; width: 4px; height: 15px; border-radius: 2px;
  background: linear-gradient(180deg, var(--wb-blue), var(--wb-purple));
}
.wb-footer p { margin: 0 0 10px; }
.wb-footer a {
  color: var(--wb-sub); text-decoration: none;
  display: inline-block; padding: 3px 0; transition: .16s;
}
.wb-footer a:hover { color: var(--wb-blue); }
.wb-footer__tools { display: grid; grid-template-columns: 1fr 1fr; gap: 2px 14px; }
@media (max-width: 560px) { .wb-footer__tools { grid-template-columns: 1fr 1fr; } }
.wb-footer__bottom {
  max-width: var(--wb-maxw);
  margin: 32px auto 0;
  padding: 18px 24px calc(18px + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--wb-line);
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 8px;
  font-size: 13.5px;
  color: #94a3b8;
}
@media (max-width: 560px) {
  .wb-footer__bottom { padding-left: 14px; padding-right: 14px; justify-content: center; text-align: center; }
}
/* ICP 备案号：带链接到工信部查询页 */
.wb-icp {
  color: var(--wb-sub);
  text-decoration: none !important;
  white-space: nowrap;
}
.wb-icp:hover { color: var(--wb-blue); }

/* ---------- 微信内置浏览器提示条 ---------- */
.wb-wxbar {
  position: relative;
  display: none;
  align-items: flex-start;
  gap: 10px;
  max-width: var(--wb-maxw);
  margin: 14px auto -4px;
  padding: 12px 18px;
  background: #fff8e6;
  border: 1px solid #ffe08a;
  border-radius: 12px;
  color: #92400e;
  font-size: 14px;
  line-height: 1.7;
}
body.is-wechat .wb-wxbar { display: flex; }
.wb-wxbar b { color: #78350f; }
.wb-wxbar__close {
  margin-left: auto; flex: 0 0 auto; cursor: pointer;
  background: none; border: 0; color: #b45309;
  font-size: 18px; line-height: 1; padding: 2px 4px;
}
@media (max-width: 560px) {
  .wb-wxbar { margin: 10px auto -4px; padding: 10px 13px; font-size: 13.5px; }
}

/* ---------- 页脚分享按钮 + toast ---------- */
.wb-footer__share {
  max-width: var(--wb-maxw);
  margin: 26px auto 0;
  padding: 0 24px;
  display: flex; align-items: center; gap: 14px;
  flex-wrap: wrap;
}
@media (max-width: 560px) { .wb-footer__share { padding: 0 14px; gap: 10px; } }
.wb-share-btn {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 46px;                        /* 触控目标不小于 44px */
  padding: 0 26px;
  border: 0; cursor: pointer;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--wb-blue), var(--wb-purple));
  color: #fff; font-size: 15.5px; font-weight: 700;
  box-shadow: 0 6px 18px rgba(37, 99, 235, .3);
  transition: transform .16s, box-shadow .16s;
  font-family: inherit;
}
.wb-share-btn:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(37, 99, 235, .38); }
.wb-share-btn:active { transform: translateY(0); }
.wb-share-tip { color: var(--wb-sub); font-size: 14px; }

.wb-toast {
  position: fixed;
  left: 50%; bottom: 42px;
  transform: translate(-50%, 16px);
  z-index: 999;
  max-width: min(88vw, 420px);
  padding: 12px 22px;
  background: rgba(15, 23, 42, .93);
  color: #fff; font-size: 14.5px;
  border-radius: 12px;
  box-shadow: 0 10px 32px rgba(15, 23, 42, .3);
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s, transform .22s;
  text-align: center;
}
.wb-toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 通用：页内小标题与提示（各工具页复用） ---------- */
.wb-sec-title {
  display: flex; align-items: center; gap: 10px;
  margin: 0 0 14px;
  font-size: 18px; font-weight: 800; color: var(--wb-ink);
}
.wb-sec-title::before {
  content: ""; width: 5px; height: 19px; border-radius: 3px;
  background: linear-gradient(180deg, var(--wb-blue), var(--wb-purple));
}

/* ---------- 响应式总则 ---------- */
@media (max-width: 860px) {
  .site-header .brand { font-size: 17px; }
  .site-header .brand .logo { width: 28px; height: 28px; font-size: 15px; }
  .site-nav a { padding: 7px 12px; font-size: 13.5px; }
  .home-section { padding: 32px 0; }
}
@media (max-width: 720px) {
  .hero { padding: 42px 0 36px; }
  /* 手机端两列卡片，触控目标不小于 44px */
  .tools-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
  .tool-card { padding: 17px 15px; border-radius: 16px; }
  .tool-card .ic { width: 44px; height: 44px; font-size: 22px; border-radius: 12px; margin-bottom: 12px; }
  .tool-card h3 { font-size: 16.5px; }
  .tool-card p { min-height: 0; font-size: 13px; }
  .cat-title { font-size: 18px; }
  .cat-title small { font-size: 12.5px; }
}
@media (max-width: 420px) {
  .tools-grid { grid-template-columns: 1fr 1fr; }
  .hero__search button { padding: 0 18px; font-size: 15px; }
}

/* ---------- 打印（去掉导航与交互元素） ---------- */
@media print {
  .site-header, .wb-wxbar, .wb-footer, .toast { display: none !important; }
  .wrap, .home-wrap { max-width: 100% !important; padding: 0 !important; }
}



/* ============================================================
   关于本站 · 本页专属样式（不与其他页面共享）
   ============================================================ */

/* about 页专用排版（在共享样式之上做扩展，不影响工具页） */
.wrap { max-width: 1320px !important; padding-left: 24px !important; padding-right: 24px !important; }
.about-hero { text-align: center; padding: 26px 0 8px; }
.about-hero h1 {
  margin: 0 0 12px; font-size: clamp(26px, 4.4vw, 40px); font-weight: 900;
  background: linear-gradient(120deg, #1e3a8a, #2563eb 45%, #7c3aed);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.about-hero p { margin: 0; color: #64748b; font-size: 16.5px; }
.about-sec {
  background: #fff; border: 1px solid #eef1f6; border-radius: 16px;
  padding: 26px 28px; margin-top: 22px;
}
.about-sec h2 {
  display: flex; align-items: center; gap: 10px;
  margin: 0 0 14px; font-size: 21px; font-weight: 800; color: #0f172a;
  scroll-margin-top: 80px;
}
.about-sec h2::before {
  content: ""; width: 5px; height: 21px; border-radius: 3px;
  background: linear-gradient(180deg, #2563eb, #7c3aed);
}
.about-sec h3 { margin: 18px 0 8px; font-size: 16.5px; font-weight: 700; color: #111827; }
.about-sec p { margin: 0 0 11px; color: #334155; line-height: 1.85; }
.about-sec ul { margin: 0 0 11px; padding-left: 22px; color: #334155; line-height: 1.85; }
.about-sec li { margin-bottom: 6px; }
.about-sec a { color: #2563eb; }
.about-box {
  background: #f8fafc; border-left: 4px solid #2563eb;
  border-radius: 8px; padding: 14px 18px; margin: 12px 0; color: #334155;
}
.tool-links { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 10px; margin: 14px 0; }
.tool-links a {
  display: block; padding: 11px 15px; background: #f8fafc; border: 1px solid #e7eaf1;
  border-radius: 10px; text-decoration: none; color: #334155; font-weight: 600; font-size: 14.5px;
  transition: .16s;
}
.tool-links a:hover { border-color: #c7d2fe; color: #2563eb; background: #fff; }
@media (max-width: 560px) {
  .about-sec { padding: 20px 17px; }
  .about-sec h2 { font-size: 18.5px; }
}

/* 🔴 全站宽度统一（2026-10-11）：body 内边距与其它工具页一致为 14px，
   否则容器会比「视频去水印」页宽出 28px（1080@0 vs 1052@14）。 */
body { padding: 0 14px 40px; }

/* 🔴 全站宽度标准（2026-10-11 大山钦定，以「视频去水印」页 qsy 为准）
   桌面：body 0 14px 40px / .wrap padding 0 24px
   小屏：body 0 10px 32px / .wrap padding 0 12px */
@media (max-width: 560px) {
  body { padding: 0 10px 32px !important; }
  .wrap { padding-left: 12px !important; padding-right: 12px !important; }
}


/* ===== 全站导航 · 分类面板（每页独立内联，不共用 css） ===== */
.site-header__inner { position: relative; }
.site-nav .nav-more__btn {
  display: inline-flex; align-items: center; gap: 6px;
  margin-left: 4px; padding: 7px 13px; border-radius: 999px;
  border: 1px solid var(--wb-blue); background: #fff; color: var(--wb-blue);
  font-size: 13.5px; font-weight: 500; cursor: pointer; white-space: nowrap;
  transition: background .15s, color .15s;
}
.site-nav .nav-more__btn:hover { background: #eef2ff; }
.site-nav .nav-more__btn svg { transition: transform .2s; }
.site-nav .nav-more__btn[aria-expanded="true"] svg { transform: rotate(180deg); }
.nav-mega {
  position: absolute; top: 100%; left: 0; right: 0; z-index: 60;
  background: #fff; border-top: 1px solid var(--wb-line);
  box-shadow: 0 14px 34px rgba(15,23,42,.10);
  display: none;
}
.nav-mega.is-open { display: block; }
.nav-mega__inner {
  max-width: var(--wb-maxw); margin: 0 auto; padding: 20px var(--page-pad-x) 24px;
  display: flex; flex-wrap: wrap; gap: 30px;
}
.nav-cat { min-width: 132px; }
.nav-cat h4 {
  margin: 0 0 10px; font-size: 13px; font-weight: 600; color: var(--wb-sub);
  letter-spacing: .02em;
}
.nav-cat a {
  display: block; padding: 7px 9px; border-radius: 8px;
  color: var(--wb-ink); font-size: 13.5px; text-decoration: none;
  transition: background .12s, color .12s;
}
.nav-cat a:hover { background: #eef2ff; color: var(--wb-blue); }
.nav-cat a.active { background: var(--wb-blue); color: #fff; }
.nav-cat__all {
  display: inline-block; margin-top: 10px; font-weight: 600; color: var(--wb-blue);
  text-decoration: none;
}
.nav-cat__all:hover { text-decoration: underline; }
.wb-toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(10px);
  background: rgba(15,23,42,.92); color: #fff; padding: 10px 16px; border-radius: 10px;
  font-size: 13.5px; z-index: 999; opacity: 0; pointer-events: none;
  transition: opacity .2s, transform .2s; max-width: 86vw;
}
.wb-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
@media (max-width: 640px) {
  .nav-mega__inner { gap: 20px 18px; padding: 16px 14px 20px; }
  .nav-cat { min-width: 44%; }
}

/* ===== 2026-10-17 导航补丁（幂等：重复执行不会叠加）===== */
/* ① 收回按钮 flex：部分页面有全局 button{flex:1 1 0%}，会把导航按钮拉满 */
.site-nav .nav-more__btn { flex: 0 0 auto; width: auto; min-width: 0; }
/* ===== 全站导航 · 分类面板（每页独立内联，不共用 css） ===== */
.site-header__inner { position: relative; }
.site-nav .nav-more__btn {
  display: inline-flex; align-items: center; gap: 6px;
  /* 🔴 必须显式收回 flex：部分工具页 css 里有全局
     `button, .btn, .primary, .ghost { flex: 1 1 0% }`，
     会把「全部工具」按钮拉成 600px 宽的大横框（2026-10-17 修） */
  flex: 0 0 auto; width: auto; min-width: 0;
  margin-left: 4px; padding: 7px 13px; border-radius: 999px;
  border: 1px solid var(--wb-blue); background: #fff; color: var(--wb-blue);
  font-size: 13.5px; font-weight: 500; cursor: pointer; white-space: nowrap;
  transition: background .15s, color .15s;
}
.site-nav .nav-more__btn:hover { background: #eef2ff; }
.site-nav .nav-more__btn svg { transition: transform .2s; }
.site-nav .nav-more__btn[aria-expanded="true"] svg { transform: rotate(180deg); }
.nav-mega {
  position: absolute; top: 100%; left: 0; right: 0; z-index: 60;
  background: #fff; border-top: 1px solid var(--wb-line);
  box-shadow: 0 14px 34px rgba(15,23,42,.10);
  display: none;
}
.nav-mega.is-open { display: block; }
.nav-mega__inner {
  max-width: var(--wb-maxw); margin: 0 auto; padding: 20px var(--page-pad-x) 24px;
  display: flex; flex-wrap: wrap; gap: 30px;
}
.nav-cat { min-width: 132px; --cat-dot: var(--wb-blue); }
/* 分类色块：用 nth-child 而不是 data-cat —— 老页面的 nav 由旧 js 生成，
   没有 data-cat 属性，靠序号同样能上色（2026-10-17） */
.nav-mega__inner > .nav-cat:nth-child(1) { --cat-dot: #2563eb; }
.nav-mega__inner > .nav-cat:nth-child(2) { --cat-dot: #7c3aed; }
.nav-mega__inner > .nav-cat:nth-child(3) { --cat-dot: #d97706; }
.nav-mega__inner > .nav-cat:nth-child(4) { --cat-dot: #db2777; }
.nav-mega__inner > .nav-cat:nth-child(5) { --cat-dot: #059669; }
.nav-cat h4 {
  margin: 0 0 10px; font-size: 13px; font-weight: 600; color: var(--wb-sub);
  letter-spacing: .02em; display: flex; align-items: center; gap: 7px;
}
.nav-cat h4::before {
  content: ""; flex: 0 0 auto; width: 8px; height: 8px; border-radius: 3px;
  background: var(--cat-dot);
}
.nav-cat a {
  display: block; padding: 7px 9px; border-radius: 8px;
  color: var(--wb-ink); font-size: 13.5px; text-decoration: none;
  transition: background .12s, color .12s;
}
.nav-cat a:hover { background: #eef2ff; color: var(--wb-blue); }
.nav-cat a.active { background: var(--wb-blue); color: #fff; }
.nav-cat__all {
  display: inline-block; margin-top: 10px; font-weight: 600; color: var(--wb-blue);
  text-decoration: none;
}
.nav-cat__all:hover { text-decoration: underline; }
.wb-toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(10px);
  background: rgba(15,23,42,.92); color: #fff; padding: 10px 16px; border-radius: 10px;
  font-size: 13.5px; z-index: 999; opacity: 0; pointer-events: none;
  transition: opacity .2s, transform .2s; max-width: 86vw;
}
.wb-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
@media (max-width: 640px) {
  .nav-mega__inner { gap: 20px 18px; padding: 16px 14px 20px; }
  .nav-cat { min-width: 44%; }
}

/* ===== 2026-10-17 面板高度补丁（幂等：重复执行不会叠加）===== */
/* ① 收回按钮 flex：部分页面有全局 button{flex:1 1 0%}，会把导航按钮拉满 */
.site-nav .nav-more__btn { flex: 0 0 auto; width: auto; min-width: 0; }

.nav-mega { max-height: calc(100vh - 56px); overflow-y: auto; -webkit-overflow-scrolling: touch; }