/* ============================================================
   VMPal 中文官网 - 全局公共样式 common.css
   编码：UTF-8 | 主题：浅色 | 主题色：#4B93E0
   说明：本文件包含 全局基础 / 按钮 / 导航栏 / 移动端菜单 / 页脚
   所有 class 均以 vp- 前缀隔离,避免与页面样式冲突
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root{
  --vp-bg:#F7FAFF;
  --vp-bg-2:#EFF4FC;
  --vp-surface:#FFFFFF;
  --vp-surface-2:#F1F6FD;
  --vp-border:rgba(31,78,150,.1);
  --vp-border-strong:rgba(31,78,150,.22);
  --vp-text:#13233F;
  --vp-muted:#52637F;
  --vp-dim:#8A99B8;
  --vp-brand:#4B93E0;
  --vp-brand-light:#2E7BD6;
  --vp-brand-deep:#2F6CC0;
  --vp-grad:linear-gradient(118deg,#4B93E0 0%,#6FB2FF 100%);
  --vp-grad-text:linear-gradient(115deg,#2E7BD6 0%,#4B93E0 55%,#38BDF8 100%);
  --vp-radius:16px;
  --vp-max:1200px;
  --vp-nav-h:72px;
  --vp-font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}

/* ---------- 基础重置 ---------- */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--vp-font);
  background:var(--vp-bg);
  color:var(--vp-text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button{font-family:inherit;border:none;background:none;cursor:pointer;color:inherit}
::selection{background:rgba(75,147,224,.28);color:#0F1E38}
body.vp-lock{overflow:hidden}

/* 细滚动条 */
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:#EDF2FA}
::-webkit-scrollbar-thumb{background:#C3D3EC;border-radius:6px;border:2px solid #EDF2FA}
::-webkit-scrollbar-thumb:hover{background:#9FB9E4}

/* ---------- 布局工具 ---------- */
.vp-container{max-width:var(--vp-max);margin:0 auto;padding:0 24px}

/* ---------- 按钮 ---------- */
.vp-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  font-size:15px;font-weight:600;line-height:1;
  padding:13px 24px;border-radius:12px;
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease,background .25s ease,color .25s ease;
  white-space:nowrap;
}
.vp-btn svg{width:16px;height:16px;flex:none}
.vp-btn-primary{
  background:var(--vp-grad);color:#fff;
  box-shadow:0 8px 24px -8px rgba(75,147,224,.55),inset 0 1px 0 rgba(255,255,255,.28);
}
.vp-btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 32px -10px rgba(75,147,224,.65),inset 0 1px 0 rgba(255,255,255,.32)}
.vp-btn-ghost{
  background:#fff;color:var(--vp-muted);
  border:1px solid var(--vp-border-strong);
}
.vp-btn-ghost:hover{color:var(--vp-brand-deep);border-color:rgba(75,147,224,.5);background:rgba(75,147,224,.06);transform:translateY(-2px)}
.vp-btn-lg{padding:16px 30px;font-size:16px;border-radius:14px}
.vp-btn-lg svg{width:18px;height:18px}

/* ============================================================
   导航栏 vp-nav（由 js/navbar.js 注入）
   ============================================================ */
.vp-nav{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  height:var(--vp-nav-h);
  background:rgba(255,255,255,.72);
  -webkit-backdrop-filter:blur(18px) saturate(160%);
  backdrop-filter:blur(18px) saturate(160%);
  border-bottom:1px solid transparent;
  transition:background .3s ease,border-color .3s ease,box-shadow .3s ease;
}
.vp-nav.vp-scrolled{
  background:rgba(255,255,255,.92);
  border-bottom-color:var(--vp-border);
  box-shadow:0 10px 34px -16px rgba(31,78,150,.22);
}
.vp-nav-inner{
  max-width:var(--vp-max);height:100%;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;gap:28px;
}

/* 品牌区 */
.vp-brand{display:flex;align-items:center;gap:12px;flex:none}
.vp-brand img{width:42px;height:42px;border-radius:11px;box-shadow:0 4px 14px -4px rgba(75,147,224,.45)}
.vp-brand-text{display:flex;flex-direction:column;line-height:1.15}
.vp-brand-name{font-size:18px;font-weight:800;letter-spacing:.02em;color:var(--vp-text)}
.vp-brand-sub{font-size:11px;color:var(--vp-dim);letter-spacing:.04em}

/* 桌面菜单 */
.vp-links{display:flex;align-items:center;gap:4px;margin-left:8px}
.vp-links a{
  position:relative;padding:9px 14px;border-radius:9px;
  font-size:14.5px;color:var(--vp-muted);
  transition:color .2s ease,background .2s ease;
}
.vp-links a:hover{color:var(--vp-brand-deep);background:rgba(75,147,224,.08)}
.vp-links a.active{color:var(--vp-brand-deep);font-weight:600}
.vp-links a.active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;
  background:var(--vp-grad);border-radius:2px;
}

/* 右侧按钮组 */
.vp-actions{margin-left:auto;display:flex;align-items:center;gap:10px;flex:none}
.vp-actions .vp-btn{padding:11px 18px;font-size:14px;border-radius:11px}

/* 语言切换 */
.vp-lang{position:relative;margin-left:auto;flex:none}
.vp-actions{margin-left:14px}
.vp-lang-btn{
  display:flex;align-items:center;gap:6px;
  height:42px;padding:0 12px;justify-content:center;
  border-radius:11px;border:1px solid var(--vp-border-strong);background:#fff;
  color:var(--vp-muted);cursor:pointer;
  transition:border-color .25s ease,color .25s ease,background .25s ease;
}
.vp-lang-btn svg{width:18px;height:18px;flex:none}
.vp-lang-cur{font-size:13.5px;font-weight:600;letter-spacing:.02em}
.vp-lang-btn svg:last-child{width:12px;height:12px;transition:transform .25s ease}
.vp-lang-btn:hover{border-color:rgba(75,147,224,.5);color:var(--vp-brand-deep);background:rgba(75,147,224,.06)}
.vp-lang.vp-open .vp-lang-btn{border-color:rgba(75,147,224,.55);color:var(--vp-brand-deep);background:rgba(75,147,224,.08)}
.vp-lang.vp-open .vp-lang-btn svg:last-child{transform:rotate(180deg)}
.vp-lang-menu{
  position:absolute;top:calc(100% + 10px);right:0;min-width:168px;
  padding:8px;border-radius:14px;
  background:rgba(255,255,255,.98);border:1px solid var(--vp-border);
  box-shadow:0 20px 44px -16px rgba(31,78,150,.25);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  display:flex;flex-direction:column;gap:2px;
  opacity:0;visibility:hidden;transform:translateY(-8px);
  transition:opacity .22s ease,transform .22s cubic-bezier(.22,1,.36,1),visibility .22s;
  z-index:60;
}
.vp-lang.vp-open .vp-lang-menu{opacity:1;visibility:visible;transform:translateY(0)}
.vp-lang-item{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:10px 13px;border-radius:9px;
  font-size:14px;color:var(--vp-muted);
  transition:color .18s ease,background .18s ease;
}
.vp-lang-item:hover{color:var(--vp-brand-deep);background:rgba(75,147,224,.08)}
.vp-lang-item.vp-lang-cur{color:var(--vp-brand-deep);font-weight:600;background:rgba(75,147,224,.1)}
.vp-lang-item.vp-lang-cur svg{color:var(--vp-brand)}

/* 汉堡按钮 */
.vp-burger{
  display:none;margin-left:auto;flex:none;
  width:44px;height:44px;border-radius:11px;
  border:1px solid var(--vp-border-strong);background:#fff;
  position:relative;transition:border-color .25s ease,background .25s ease;
}
.vp-burger:hover{border-color:rgba(75,147,224,.5);background:rgba(75,147,224,.06)}
.vp-burger span{
  position:absolute;left:12px;width:20px;height:2px;border-radius:2px;
  background:var(--vp-text);transition:transform .35s cubic-bezier(.22,1,.36,1),opacity .25s ease,top .35s cubic-bezier(.22,1,.36,1);
}
.vp-burger span:nth-child(1){top:15px}
.vp-burger span:nth-child(2){top:21px}
.vp-burger span:nth-child(3){top:27px}
.vp-burger.vp-open span:nth-child(1){top:21px;transform:rotate(45deg)}
.vp-burger.vp-open span:nth-child(2){opacity:0;transform:translateX(-8px)}
.vp-burger.vp-open span:nth-child(3){top:21px;transform:rotate(-45deg)}

/* ============================================================
   移动端全屏菜单 vp-mnav（由 js/navbar.js 注入）
   设计：浅色玻璃拟态 + 编号大菜单 + 底部联系与按钮
   ============================================================ */
.vp-mnav{
  position:fixed;inset:0;z-index:990;
  background:
    radial-gradient(90% 60% at 85% 8%,rgba(75,147,224,.14) 0%,transparent 60%),
    radial-gradient(70% 50% at 10% 95%,rgba(75,147,224,.08) 0%,transparent 60%),
    rgba(247,250,255,.96);
  -webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px);
  padding:calc(var(--vp-nav-h) + 20px) 28px 34px;
  display:flex;flex-direction:column;
  opacity:0;visibility:hidden;transform:translateY(-14px);
  transition:opacity .38s ease,transform .38s cubic-bezier(.22,1,.36,1),visibility .38s;
  overflow-y:auto;
}
.vp-mnav.vp-open{opacity:1;visibility:visible;transform:translateY(0)}

.vp-mnav-list{display:flex;flex-direction:column}
.vp-mitem{
  display:flex;align-items:baseline;gap:16px;
  padding:17px 4px;border-bottom:1px solid var(--vp-border);
  opacity:0;transform:translateY(22px);
  transition:opacity .45s ease,transform .45s cubic-bezier(.22,1,.36,1),padding .2s ease;
}
.vp-mnav.vp-open .vp-mitem{opacity:1;transform:translateY(0);transition-delay:calc(var(--i)*65ms + 130ms)}
.vp-mitem:active{padding-left:10px}
.vp-mitem .vp-mnum{
  font-size:12px;font-weight:700;letter-spacing:.12em;color:var(--vp-brand);
  font-variant-numeric:tabular-nums;flex:none;
}
.vp-mitem .vp-mlabel{font-size:26px;font-weight:700;letter-spacing:.02em;color:var(--vp-text)}
.vp-mitem .vp-marrow{margin-left:auto;color:var(--vp-dim);transition:color .2s,transform .2s}
.vp-mitem:active .vp-marrow{color:var(--vp-brand);transform:translateX(4px)}
.vp-mitem.active .vp-mlabel{background:var(--vp-grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

.vp-mnav-foot{margin-top:auto;padding-top:30px}
.vp-mlangs{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:20px}
.vp-mlang{
  padding:11px 6px;border-radius:10px;text-align:center;
  border:1px solid var(--vp-border-strong);background:#fff;
  font-size:13.5px;color:var(--vp-muted);
  transition:border-color .2s ease,color .2s ease,background .2s ease;
}
.vp-mlang:active,.vp-mlang:hover{border-color:rgba(75,147,224,.5);color:var(--vp-brand-deep)}
.vp-mlang.vp-lang-cur{border-color:rgba(75,147,224,.55);background:rgba(75,147,224,.1);color:var(--vp-brand-deep);font-weight:600}
.vp-mnav-meta{
  display:flex;flex-direction:column;gap:6px;margin-bottom:18px;
  font-size:13px;color:var(--vp-dim);
}
.vp-mnav-meta a{color:var(--vp-muted)}
.vp-mnav-btns{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.vp-mnav-btns .vp-btn{width:100%;padding:15px 10px;font-size:15px}

/* ============================================================
   页脚 vp-footer（由 js/footer.js 注入）
   ============================================================ */
.vp-footer{
  position:relative;
  background:linear-gradient(180deg,#F7FAFF 0%,#EDF3FC 100%);
  border-top:1px solid var(--vp-border);
  overflow:hidden;
}
.vp-footer::before{
  content:"";position:absolute;top:-1px;left:50%;transform:translateX(-50%);
  width:min(720px,80%);height:1px;
  background:linear-gradient(90deg,transparent,rgba(75,147,224,.6),transparent);
}
.vp-footer-inner{position:relative;padding:64px 0 34px}

/* 页脚上区：品牌 + 联系 */
.vp-foot-top{
  display:grid;grid-template-columns:1.25fr 1fr;gap:48px;
  padding-bottom:44px;border-bottom:1px solid var(--vp-border);
}
.vp-foot-brand .vp-brand img{width:48px;height:48px;border-radius:13px}
.vp-foot-slogan{margin-top:20px;font-size:15.5px;color:var(--vp-muted);line-height:1.9;max-width:42ch}
.vp-foot-sys{margin-top:16px;font-size:13px;letter-spacing:.1em;color:var(--vp-dim)}
.vp-foot-sys b{color:var(--vp-brand-light);font-weight:600}

.vp-foot-contact{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-content:start}
.vp-contact-card{
  display:flex;flex-direction:column;gap:12px;
  padding:20px;border-radius:14px;
  background:var(--vp-surface);border:1px solid var(--vp-border);
  transition:border-color .25s ease,transform .25s ease,box-shadow .25s ease;
}
.vp-contact-card:hover{border-color:rgba(75,147,224,.4);transform:translateY(-3px);box-shadow:0 14px 30px -16px rgba(31,78,150,.25)}
.vp-contact-ico{
  width:38px;height:38px;border-radius:10px;flex:none;
  display:flex;align-items:center;justify-content:center;
  background:rgba(75,147,224,.1);border:1px solid rgba(75,147,224,.25);
}
.vp-contact-ico svg{width:18px;height:18px;stroke:var(--vp-brand-light)}
.vp-contact-label{font-size:12px;color:var(--vp-dim);letter-spacing:.08em}
.vp-contact-val{font-size:15px;font-weight:600;color:var(--vp-text);word-break:break-all;transition:color .2s}
.vp-contact-card a.vp-contact-val:hover{color:var(--vp-brand-light)}

/* 授权声明 */
.vp-foot-notice{
  display:flex;gap:16px;align-items:flex-start;
  margin-top:34px;padding:22px 24px;border-radius:14px;
  background:linear-gradient(120deg,rgba(75,147,224,.1),rgba(75,147,224,.04));
  border:1px solid rgba(75,147,224,.22);
}
.vp-foot-notice svg{width:20px;height:20px;flex:none;margin-top:3px;stroke:var(--vp-brand)}
.vp-foot-notice p{font-size:14px;color:var(--vp-muted);line-height:1.85}
.vp-foot-notice p b{color:var(--vp-brand-deep);font-weight:600}
.vp-foot-notice p.en{margin-top:8px;font-size:12.5px;color:var(--vp-dim)}

/* 页脚底栏 */
.vp-foot-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  margin-top:36px;padding-top:26px;border-top:1px solid var(--vp-border);
  font-size:13px;color:var(--vp-dim);
}
.vp-foot-bottom b{color:var(--vp-muted);font-weight:600}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1080px){
  .vp-links{display:none}
  .vp-burger{display:block;margin-left:0}
  .vp-lang{margin-right:12px}
  .vp-actions{margin-left:0}
  .vp-lang-menu{right:auto;left:50%;transform:translate(-50%,-8px)}
  .vp-lang.vp-open .vp-lang-menu{transform:translate(-50%,0)}
}
@media (max-width:640px){
  .vp-actions{display:none}
  .vp-foot-top{grid-template-columns:1fr;gap:34px}
  .vp-foot-contact{grid-template-columns:1fr}
  .vp-foot-bottom{flex-direction:column;align-items:flex-start;gap:8px}
}
@media (min-width:641px) and (max-width:1080px){
  .vp-actions .vp-btn{padding:10px 14px;font-size:13px}
}
@media (max-width:1080px){
  .vp-foot-top{grid-template-columns:1fr;gap:36px}
}