/* 全站唯一 header CSS（buddylala.ai）。
   載入次序：必須排在 </head> 之前、所有頁面原有 nav CSS 之後 →
   相同特異度下後者勝出，用來覆蓋各頁殘留的舊 nav 樣式。
   來源：blog 系列頁面（166 頁）的 nav CSS，2026-10-15 實測擷取後整併。 */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgb(249,250,251);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:none;
  padding:1.25rem 0;transition:padding .3s ease,box-shadow .3s ease;}
.nav.nav-scrolled{padding:.75rem 0;box-shadow:0 1px 3px rgba(0,0,0,.1),0 1px 2px -1px rgba(0,0,0,.1);}
.nav > div{max-width:1280px;margin:0 auto;width:100%;display:flex;align-items:center;
  justify-content:space-between;padding:0 1.5rem;}
.nav-logo{display:flex;align-items:center;gap:.5rem;text-decoration:none;}
.nav-logo img{height:48px;width:auto;object-fit:contain;}
.nav-links{display:flex;gap:2rem;align-items:center;}
.nav-links > a{position:relative;font-size:.875rem;font-weight:500;color:rgb(72,77,87);
  text-decoration:none;transition:color .2s;white-space:nowrap;}
.nav-links > a::after{content:'';position:absolute;bottom:-6px;left:0;height:2px;width:0;
  background:rgb(239,136,52);transition:width .3s;}
.nav-links > a:hover::after{width:100%;}
.nav-links > a:hover{color:rgb(239,136,52);}
.nav-links a.active{color:rgb(237,137,54);font-weight:600;}
.nav-links > a.active::after{width:100%;}
.nav-links .svc-dropdown{position:relative;display:inline-block;}
.nav-links .svc-trigger{position:relative;display:inline-flex;align-items:center;gap:.25rem;
  font-size:.875rem;font-weight:500;color:rgb(72,77,87);text-decoration:none;
  transition:color .2s;white-space:nowrap;}
.nav-links .svc-trigger:hover{color:rgb(239,136,52);}
.nav-links .svc-trigger.active{color:rgb(237,137,54);font-weight:600;}
.nav-links .svc-panel{position:absolute;top:100%;left:0;min-width:230px;background:#fff;
  border:1px solid #e2e8f0;border-radius:12px;box-shadow:0 10px 32px rgba(0,0,0,.12);
  padding:.5rem;opacity:0;visibility:hidden;transform:translateY(8px);
  transition:all .2s ease;z-index:60;}
.nav-links .svc-panel a{display:block;padding:.55rem .85rem;border-radius:8px;color:#1a202c;
  text-decoration:none;font-size:.875rem;font-weight:500;transition:background .15s,color .15s;}
.nav-links .svc-panel a::after{display:none;}
.nav-links .svc-panel a:hover{background:#f7fafc;color:#ed8936;}
.nav-links .svc-dropdown:hover .svc-panel,
.nav-links .svc-dropdown:focus-within .svc-panel{opacity:1;visibility:visible;transform:translateY(0);}
.nav-links .svc-dropdown:hover .svc-trigger svg{transform:rotate(180deg);}
.nav-right{display:flex;align-items:center;gap:16px;}
.nav-right a{text-decoration:none;}
.nav-links .lang-switch.en-mobile{display:none;}
.nav-cta{display:inline-flex;align-items:center;justify-content:center;min-height:44px;
  padding:8px 16px;background:rgb(26,53,91);color:#fff;border-radius:9999px;font-weight:500;
  font-size:14px;text-decoration:none;white-space:nowrap;
  box-shadow:0 1px 3px rgba(0,0,0,.1),0 1px 2px -1px rgba(0,0,0,.1);
  transition:background .2s,transform .2s;}
.nav-cta::after{display:none;}
.nav-cta:hover{background:rgba(26,53,91,.9);color:#fff;transform:scale(1.02);}
.nav-mobile-btn{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:#1f2937;}
@media (max-width:768px){
  .nav-links{display:none;}
  .nav-mobile-btn{display:block;}
  .nav-right{display:none;}
  .nav-links .lang-switch.en-mobile{display:inline-flex;}
  .nav-links .svc-trigger svg{display:none;}
  .nav-links.open{display:flex;flex-direction:column;position:absolute;top:100%;left:0;right:0;
    background:#fff;padding:1rem 2rem;gap:1rem;box-shadow:0 4px 6px -1px rgba(0,0,0,.1);
    max-height:calc(100vh - 60px);overflow-y:auto;-webkit-overflow-scrolling:touch;}
}