/* Smooth scrolling for entire page */
html {
  scroll-behavior: smooth;
}

/* Color Scheme: Navy Blue + Tech Cyan */
:root {
    --trust-blue: #1A2B4C;
    --innovation-cyan: #00CFD5;
    --bg-light: #F8F9FA;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
}

body{font-family:'Inter',sans-serif;background:#0f172a;color:#e2e8f0}
.nex-title{font-family:'Space Grotesk',sans-serif}
.gradient-hero{background:linear-gradient(135deg,#1A2B4C 0%,#0f172a 50%,#1e293b 100%)}
.neon-accent{color:#00CFD5;text-shadow:0 0 10px rgba(0,207,213,.3)}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
header{background:rgba(15,23,42,.95);backdrop-filter:blur(10px);padding:16px 0;position:fixed;width:100%;top:0;z-index:1000;border-bottom:1px solid rgba(0,212,255,.2);transition:all 0.3s ease}
header+*{margin-top:80px}
nav{display:flex;justify-content:space-between;align-items:center}
.logo{font-size:1.8rem;font-weight:700;color:#00d4ff;text-decoration:none;text-shadow:0 0 10px rgba(0,212,255,.3);transition:all 0.3s ease;transform:translateZ(0);display:flex;align-items:center;gap:8px}
.logo img{height:32px;width:auto;object-fit:contain;display:block;flex-shrink:0}
.logo span{display:inline-block;white-space:nowrap}
.logo:hover{transform:scale(1.05);text-shadow:0 0 20px rgba(0,212,255,.5)}
.logo:hover img{transform:scale(1.05)}
.nav-links{display:flex;list-style:none;gap:2rem;align-items:center}
.nav-links a{color:#e2e8f0;text-decoration:none;transition:all 0.3s cubic-bezier(0.4, 0, 0.2, 1);position:relative;padding:4px 0}
.nav-links a::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:linear-gradient(90deg,#00d4ff,#3b82f6);transition:width 0.3s cubic-bezier(0.4, 0, 0.2, 1);transform:translateZ(0)}
.nav-links a:hover{color:#00d4ff;transform:translateY(-2px)}
.nav-links a:hover::after{width:100%}
.nav-links a:active{transform:translateY(0)}
.dropdown{position:relative}
.dropdown-content{display:none;position:absolute;top:100%;left:0;background:rgba(15,23,42,.98);backdrop-filter:blur(10px);border:1px solid rgba(0,212,255,.2);border-radius:8px;min-width:280px;box-shadow:0 10px 25px rgba(0,0,0,.5);opacity:0;transform:translateY(-10px) scale(0.95);transition:all 0.3s cubic-bezier(0.4, 0, 0.2, 1);transform-origin:top left}
.dropdown:hover .dropdown-content{display:block;opacity:1;transform:translateY(0) scale(1)}
.dropdown-item{display:flex;align-items:center;padding:12px 16px;color:#e2e8f0;border-bottom:1px solid rgba(0,212,255,.1);text-decoration:none;transition:all 0.2s ease;transform:translateX(0)}
.dropdown-item:last-child{border-bottom:none}
.dropdown-item:hover{background:rgba(0,212,255,.1);color:#00d4ff;transform:translateX(5px);padding-left:20px}
.dropdown-icon{width:20px;height:20px;border-radius:4px;display:flex;align-items:center;justify-content:center;margin-right:12px;font-size:12px;transition:transform 0.2s ease}
.dropdown-item:hover .dropdown-icon{transform:scale(1.1)}
@media(max-width:768px){.nav-links{flex-direction:column;gap:16px}}

/* 多语言内容默认隐藏 - 等待脚本显示对应语言 */
[data-lang] {
  display: none !important;
}
/* 默认显示英语（如果脚本未加载） */
[data-lang="en"] {
  display: inline !important;
}
/* 块级元素 */
div[data-lang="en"],
section[data-lang="en"],
article[data-lang="en"],
p[data-lang="en"],
h1[data-lang="en"],
h2[data-lang="en"],
h3[data-lang="en"],
h4[data-lang="en"],
h5[data-lang="en"],
h6[data-lang="en"] {
  display: block !important;
}

/* Language Switcher Styles */
.language-switcher {
  position: relative;
  display: inline-block;
  margin-left: 1rem;
}

.language-switcher-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 6px;
  color: #e2e8f0;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.9rem;
  font-weight: 500;
}

.language-switcher-btn:hover {
  background: rgba(0, 212, 255, 0.2);
  border-color: rgba(0, 212, 255, 0.5);
  color: #00d4ff;
  transform: translateY(-2px);
}

.language-switcher-btn:focus {
  outline: 2px solid #00d4ff;
  outline-offset: 2px;
}

.language-switcher-arrow {
  font-size: 0.7rem;
  transition: transform 0.3s ease;
  color: #94a3b8;
}

.language-switcher-btn[aria-expanded="true"] .language-switcher-arrow {
  transform: rotate(180deg);
}

.language-switcher-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: rgba(15, 23, 42, 0.98);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 8px;
  min-width: 180px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  opacity: 0;
  transform: translateY(-10px) scale(0.95);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  transform-origin: top right;
  pointer-events: none;
  z-index: 1000;
  overflow: hidden;
}

.language-switcher-dropdown.active {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.language-switcher-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.75rem 1rem;
  background: transparent;
  border: none;
  color: #e2e8f0;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
  font-size: 0.9rem;
  gap: 0.75rem;
}

.language-switcher-option:hover {
  background: rgba(0, 212, 255, 0.1);
  color: #00d4ff;
}

.language-switcher-option.active {
  background: rgba(0, 212, 255, 0.15);
  color: #00d4ff;
}

.language-switcher-flag {
  font-size: 1.2rem;
  line-height: 1;
}

.language-switcher-name {
  flex: 1;
  font-weight: 500;
}

.language-switcher-check {
  color: #00d4ff;
  font-weight: bold;
  font-size: 1rem;
}

/* Mobile styles for language switcher */
@media (max-width: 768px) {
  .language-switcher {
    margin-left: 0;
    margin-top: 1rem;
    width: 100%;
  }

  .language-switcher-btn {
    width: 100%;
    justify-content: space-between;
  }

  .language-switcher-dropdown {
    position: static;
    width: 100%;
    margin-top: 0.5rem;
    transform: none;
    opacity: 1;
    display: none;
  }

  .language-switcher-dropdown.active {
    display: block;
    transform: none;
  }
}