/* ==========================================================================
   工伴AI · 全站设计系统（assets/gongban.css）
   定位：公开站点统一 token + 导航 + 页脚 + 按钮 + 通用组件
   页面专属样式由 page-level CSS / <style> 在 gongban.css 之后补充。

   品牌硬约束
   - 主色采用企业蓝白：blue / sky，纯色无渐变
   - 浅色区文字用深版 token，深色区文字用亮版 token
   - 禁止引入暖色（粉/橙/红/黄）作为装饰色
   ========================================================================== */

:root{
  /* 品牌色（企业蓝白，纯色无渐变） */
  --brand:#175CD3;            /* 企业门户主蓝：CTA/品牌标识 */
  --brand-2:#2563EB;          /* 链接/高亮 */
  --accent:#0EA5E9;           /* sky-500：点缀/辅助强调 */
  --brand-dark:#164C9C;       /* 浅色区文字/描边 */
  --brand-2-dark:#1D4ED8;     /* blue-700 */
  --accent-dark:#0369A1;      /* sky-700 */
  --brand-bright:#60A5FA;     /* blue-400：深色区高亮 */
  --brand-2-bright:#93C5FD;   /* blue-300 */
  --accent-bright:#7DD3FC;    /* sky-300 */

  /* 中性色 */
  --ink:#071733;
  --ink-2:#344054;
  --ink-3:#667085;
  --muted:#94A3B8;

  /* 表面色 */
  --bg:#FFFFFF;
  --bg-soft:#F7F9FC;
  --bg-surface:#EEF4FF;
  --dark:#071733;
  --dark-2:#102A56;

  /* 线与分割 */
  --line:#DCE4F0;
  --line-soft:#EDF2F7;
  --line-v:rgba(99,102,241,.14);

  /* 阴影 */
  --shadow-xs:0 1px 2px rgba(15,23,42,.04);
  --shadow:0 4px 24px rgba(15,23,42,.06);
  --shadow-md:0 12px 40px rgba(15,23,42,.08);
  --shadow-lg:0 24px 60px rgba(15,23,42,.10);
  --shadow-xl:0 32px 80px rgba(15,23,42,.12);

  /* 圆角 */
  --radius-sm:9px;
  --radius:14px;
  --radius-lg:20px;
  --radius-xl:28px;
  --radius-full:999px;

  /* 排版 */
  --font-stack:"Inter","SF Pro Text","HarmonyOS Sans SC","MiSans","PingFang SC","Noto Sans SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --font-display:"SF Pro Display","Inter","HarmonyOS Sans SC","MiSans","PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;

  /* 布局 */
  --container:1320px;
  --container-narrow:1080px;
  --nav-h:76px;
  --section-pad:104px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-stack);
  color:var(--ink);
  background:var(--bg);
  line-height:1.65;
  letter-spacing:.005em;
  font-optical-sizing:auto;
  font-synthesis:none;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-synthesis:none;
  text-wrap:balance;
}
p{ text-wrap:pretty; }
img,svg{vertical-align:middle}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
::selection{background:rgba(14,165,233,.18);color:var(--ink)}

:focus-visible{outline:3px solid rgba(37,99,235,.32);outline-offset:3px}
.skip-link{
  position:fixed;left:20px;top:12px;z-index:1000;
  padding:10px 16px;border-radius:10px;background:#fff;color:var(--brand-dark);
  border:1px solid var(--line);box-shadow:var(--shadow-md);font-weight:700;
  transform:translateY(-160%);transition:transform .2s;
}
.skip-link:focus{transform:none}

/* 工具类 */
.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}
.tabular{font-variant-numeric:tabular-nums}
.center{text-align:center}
.flex{display:flex}
.items-center{align-items:center}
.justify-between{justify-content:space-between}
.gap-2{gap:8px}
.gap-3{gap:12px}
.gap-4{gap:16px}

/* 容器 */
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
.container-narrow{max-width:var(--container-narrow)}

/* 阅读进度条 */
.progress{position:fixed;top:0;left:0;height:2px;width:0;z-index:200;background:var(--brand);box-shadow:0 0 12px rgba(30,64,175,.4)}

/* ------------------------------------------------------------------ 导航 */
.site-nav,
body>nav:not(.crumb){
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  height:var(--nav-h);
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(18px) saturate(1.2);
  border-bottom:1px solid var(--line);
  transition:background .25s,border-color .25s,box-shadow .25s;
}
.site-nav.scrolled,
body>nav:not(.crumb).scrolled{
  background:rgba(255,255,255,.96);
  border-bottom-color:var(--line-soft);
  box-shadow:var(--shadow-xs);
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:100%;
}
.logo{
  display:inline-flex;align-items:center;gap:10px;
  font-size:20px;font-weight:800;color:var(--ink);
  letter-spacing:-.02em;
}
.logo img{display:block;width:118px;height:auto}
.logo-mark{
  width:34px;height:34px;border-radius:10px;
  background:var(--brand);
  display:grid;place-items:center;
  box-shadow:0 4px 14px rgba(30,64,175,.25);
}
.logo-mark svg{width:20px;height:20px;color:#fff}

.nav-links{
  display:flex;align-items:center;gap:34px;
  font-size:15px;font-weight:600;color:var(--ink-2);
}
.nav-links a{position:relative;padding:6px 0;transition:color .2s}
.nav-links a::after{
  content:"";position:absolute;bottom:-2px;left:0;width:0;height:2px;border-radius:2px;
  background:var(--brand);
  transition:width .25s;
}
.nav-links a:hover{color:var(--brand-dark)}
.nav-links a.on,
.nav-links a[aria-current="page"]{color:var(--brand-dark)}
.nav-links a.on::after,
.nav-links a[aria-current="page"]::after,
.nav-links a:hover::after{width:100%}

.nav-cta{display:flex;align-items:center;gap:12px}
.burger{
  display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:11px;
  background:#fff;font-size:23px;cursor:pointer;color:var(--ink);align-items:center;justify-content:center;
}

/* ------------------------------------------------------------------ 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 28px;border-radius:12px;font-size:15px;font-weight:700;
  border:none;cursor:pointer;white-space:nowrap;
  position:relative;isolation:isolate;
  transition:transform .2s cubic-bezier(.22,1,.36,1),box-shadow .2s,background .2s,color .2s;
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn-sm{padding:10px 22px;font-size:14px;border-radius:10px}
.btn-lg{padding:16px 32px;font-size:16px;border-radius:14px}

.btn-primary{
  color:#fff;
  background:var(--brand);
  box-shadow:0 8px 24px rgba(30,64,175,.35);
  overflow:hidden;
}
.btn-primary::after{
  content:"";position:absolute;z-index:-1;inset:-30% auto -30% -55%;width:34%;
  background:rgba(255,255,255,.2);transform:skewX(-18deg) translateX(-220%);
  transition:transform .65s cubic-bezier(.22,1,.36,1);pointer-events:none;
}
.btn-primary:hover::after{transform:skewX(-18deg) translateX(520%)}
.btn.btn-primary:hover,.btn.btn-primary:focus-visible,.btn.btn-primary:active{
  color:#fff;
  background:var(--brand);
  box-shadow:0 14px 34px rgba(30,64,175,.4);
}
.btn-primary .arrow{transition:transform .2s}
.btn-primary:hover .arrow{transform:translateX(3px)}

.btn-secondary{
  color:var(--ink);
  background:var(--bg);
  border:1.5px solid var(--line);
}
.btn.btn-secondary:hover,.btn.btn-secondary:focus-visible,.btn.btn-secondary:active{border-color:var(--brand);color:var(--brand-dark);background:var(--bg);box-shadow:var(--shadow)}

.btn-ghost{
  color:var(--ink-2);
  background:transparent;
  border:1.5px solid var(--line);
}
.btn.btn-ghost:hover,.btn.btn-ghost:focus-visible,.btn.btn-ghost:active{border-color:var(--brand);color:var(--brand-dark);background:transparent}

.btn-white{
  color:var(--brand-2-dark);
  background:#fff;
  box-shadow:var(--shadow-md);
}
.btn.btn-white:hover,.btn.btn-white:focus-visible,.btn.btn-white:active{color:var(--brand-2-dark);background:#fff;box-shadow:var(--shadow-lg)}

.btn-dark{
  color:#fff;
  background:var(--dark);
  box-shadow:var(--shadow-md);
}
.btn.btn-dark:hover,.btn.btn-dark:focus-visible,.btn.btn-dark:active{color:#fff;background:var(--dark-2);box-shadow:var(--shadow-lg)}

/* CTA 深色区的描边按钮：显式固定交互态前景色，避免继承或后续主题覆盖
   造成 hover 后白字消失。 */
.btn-line{
  color:#fff;
  background:transparent;
  border:1.5px solid rgba(255,255,255,.45);
}
.btn.btn-line:hover,.btn.btn-line:focus-visible,.btn.btn-line:active{
  color:#fff;
  background:rgba(255,255,255,.08);
  border-color:#fff;
  box-shadow:0 10px 26px rgba(3,16,40,.16);
}

/* ------------------------------------------------------------------ 页脚 */
footer{
  background:var(--dark);
  color:#94A3B8;
  padding:72px 0 32px;
  font-size:14px;
}
footer .logo{color:#fff}
.foot-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1.2fr;
  gap:48px;
  margin-bottom:48px;
}
.foot-grid h5{
  color:#fff;font-size:15px;font-weight:700;margin-bottom:18px;
}
.foot-grid a{
  display:block;margin-bottom:11px;color:#94A3B8;transition:color .2s;
}
.foot-grid a:hover{color:#fff}
.foot-about p{
  color:#94A3B8;line-height:1.8;margin-top:14px;
}
.foot-contact{
  display:flex;flex-wrap:wrap;gap:18px;justify-content:center;
  font-size:13.5px;margin-bottom:18px;
}
.foot-contact a{color:#94A3B8;transition:color .2s}
.foot-contact a:hover{color:#fff}
.foot-bottom{
  border-top:1px solid rgba(255,255,255,.08);
  padding-top:24px;text-align:center;font-size:13px;color:#64748B;
}

/* ------------------------------------------------------------------ 通用区块 */
.section{padding:var(--section-pad) 0}
.section-soft{background:var(--bg-soft)}
.section-dark{
  background:var(--dark);
  color:#fff;
}
.section-dark .sec-title{color:#fff}
.section-dark .sec-sub{color:#CBD5E1}

.section-head{margin-bottom:56px}
.section-head.center{max-width:720px;margin-left:auto;margin-right:auto}
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:700;letter-spacing:.08em;
  color:var(--brand-dark);
  background:rgba(30,64,175,.08);
  border:1px solid rgba(30,64,175,.15);
  padding:6px 14px;border-radius:var(--radius-full);
  margin-bottom:16px;
}
.kicker::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:var(--brand);
}
.sec-title{
  font-size:clamp(30px,4vw,44px);
  font-weight:900;line-height:1.18;letter-spacing:-.02em;
  color:var(--ink);
  margin-bottom:16px;
}
.sec-sub{
  font-size:18px;line-height:1.75;color:var(--ink-2);max-width:640px;
}
.sec-title + .sec-sub{margin-top:0}

/* ------------------------------------------------------------------ 网格 */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}

/* ------------------------------------------------------------------ 通用卡片 */
.gb-card{
  background:var(--bg);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:28px;
  transition:transform .3s cubic-bezier(.22,1,.36,1),box-shadow .3s,border-color .3s;
}
.gb-card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-lg);
  border-color:rgba(14,165,233,.25);
}

/* ------------------------------------------------------------------ 表单 */
.form-input{
  width:100%;padding:14px 18px;border-radius:12px;
  border:1px solid var(--line);background:var(--bg-soft);
  font-size:15px;color:var(--ink);font-family:inherit;
  transition:border-color .2s,background .2s,box-shadow .2s;
}
.form-input::placeholder{color:var(--muted)}
.form-input:focus{
  outline:none;border-color:var(--brand);
  background:var(--bg);
  box-shadow:0 0 0 3px rgba(14,165,233,.12);
}
textarea.form-input{resize:vertical;min-height:120px}

/* ------------------------------------------------------------------ 动效 */
.reveal{
  transition:opacity .7s cubic-bezier(.22,1,.36,1),
             transform .7s cubic-bezier(.22,1,.36,1);
}
.anim .reveal{opacity:0;transform:translateY(28px)}
.anim .reveal.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none!important;transition:none!important}
  .progress{display:none}
}

/* ------------------------------------------------------------------ 响应式 */
@media (max-width:1100px){
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .grid-4{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:900px){
  :root{--section-pad:90px}
  .nav-links,.nav-cta .btn-ghost{display:none}
  .burger{display:inline-flex}
  .nav-links.open{
    display:flex;position:absolute;top:calc(var(--nav-h) - 1px);left:16px;right:16px;
    background:rgba(255,255,255,.98);border:1px solid var(--line);border-radius:18px;
    box-shadow:var(--shadow-lg);flex-direction:column;align-items:stretch;padding:14px;gap:2px;
  }
  .nav-links.open a{padding:12px 14px;border-radius:10px}
  .nav-links.open a:hover{background:var(--bg-surface)}
  .nav-links.open a::after{display:none}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:700px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .section-head{margin-bottom:40px}
  .sec-title{font-size:clamp(28px,7vw,36px)}
  .foot-grid{grid-template-columns:1fr}
  .foot-bottom{padding-top:20px}
}
@media (max-width:600px){
  /* 中英文 CTA 长度差异很大。小屏只保留语言切换与菜单，避免英文按钮
     挤出视口；联系入口仍在菜单、正文 CTA 与页尾中完整保留。 */
  .nav-cta>.btn-primary{display:none}
}
@media (max-width:480px){
  .container{padding:0 18px}
  .btn{padding:12px 22px;font-size:14px}
}