.site-header{position:fixed;top:0;left:0;right:0;z-index:var(--z-header);background:var(--glass-bg);backdrop-filter:var(--glass-blur);border-bottom:1px solid var(--glass-border);transition:all var(--transition-base)}
.site-header.scrolled{background:rgba(6,13,26,0.95);box-shadow:var(--shadow-md);border-bottom-color:var(--border-hover)}
.header-inner{display:flex;align-items:center;justify-content:space-between;max-width:var(--container-max);margin:0 auto;padding:0 1.5rem;height:70px}
.logo{display:flex;align-items:center;gap:0.75rem;flex-shrink:0}
.logo-mark{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:var(--gradient-primary);border-radius:var(--radius-md);font-weight:900;font-size:1.25rem;color:#fff;box-shadow:var(--shadow-glow);position:relative;overflow:hidden}
.logo-mark::after{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:linear-gradient(45deg,transparent 30%,rgba(255,255,255,0.3) 50%,transparent 70%);animation:logoShine 3s infinite}
@keyframes logoShine{0%{transform:translateX(-100%) rotate(45deg)}100%{transform:translateX(100%) rotate(45deg)}}
.logo-text{display:flex;flex-direction:column}
.logo-name{font-size:1.125rem;font-weight:800;color:var(--text-primary);letter-spacing:0.5px}
.logo-sub{font-size:0.7rem;color:var(--text-muted);letter-spacing:1px}
.main-nav{display:flex;align-items:center;gap:0.25rem;flex:1;justify-content:center;margin:0 1rem}
.nav-item{position:relative;white-space:nowrap;flex-shrink:0;display:flex;align-items:center}
.nav-link{display:inline-flex;align-items:center;padding:0.5rem 0.875rem;font-size:0.9rem;font-weight:500;color:var(--text-secondary);border-radius:var(--radius-sm);transition:all var(--transition-fast);position:relative}
.nav-link:hover,.nav-link.active,.nav-link.on{color:var(--accent);background:rgba(0,212,255,0.08)}
.nav-link::after{content:"";position:absolute;bottom:0;left:50%;width:0;height:2px;background:var(--gradient-primary);transition:all var(--transition-fast);transform:translateX(-50%)}
.nav-link:hover::after,.nav-link.active::after,.nav-link.on::after{width:60%}
.header-right{display:flex;align-items:center;gap:1rem;flex-shrink:0}
.header-btn{padding:0.625rem 1.5rem;background:var(--gradient-primary);color:#fff;font-size:0.875rem;font-weight:600;border-radius:var(--radius-md);transition:all var(--transition-base);box-shadow:var(--shadow-glow)}
.header-btn:hover{transform:translateY(-1px);box-shadow:0 0 30px rgba(30,111,255,0.6);color:#fff}
.mobile-toggle{display:none;flex-direction:column;gap:5px;padding:8px;cursor:pointer}
.mobile-toggle span{width:24px;height:2px;background:var(--text-primary);border-radius:2px;transition:all var(--transition-fast)}
.mobile-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.mobile-toggle.active span:nth-child(2){opacity:0}
.mobile-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
.mobile-menu{display:none;position:fixed;top:70px;left:0;right:0;bottom:0;background:rgba(6,13,26,0.98);backdrop-filter:var(--glass-blur);flex-direction:column;padding:2rem;gap:0.5rem;z-index:99;overflow-y:auto}
.mobile-menu.active{display:flex}
.mobile-menu a{padding:1rem;font-size:1.1rem;color:var(--text-secondary);border-radius:var(--radius-sm);transition:all var(--transition-fast);border-left:3px solid transparent}
.mobile-menu a:hover,.mobile-menu a.active{color:var(--accent);background:rgba(0,212,255,0.08);border-left-color:var(--accent)}
@media(max-width:1024px){.main-nav{display:none}.mobile-toggle{display:flex}.header-btn{display:none}}


/* 更多下拉菜单 */
.nav-item.dropdown{position:relative;}
.dropdown-menu{
  position:absolute;top:100%;left:0;min-width:170px;
  background:rgba(9,20,36,0.97);border:1px solid rgba(30,111,255,0.25);
  border-radius:12px;padding:8px 0;backdrop-filter:blur(10px);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:all .3s ease;z-index:100;box-shadow:0 12px 32px rgba(0,0,0,0.4);
}
.nav-item.dropdown:hover .dropdown-menu,.nav-item.dropdown:focus-within .dropdown-menu{
  opacity:1;visibility:visible;transform:translateY(0);
}
.dropdown-menu a{
  display:block;padding:10px 18px;color:rgba(255,255,255,0.78);
  font-size:0.84rem;white-space:nowrap;transition:all .2s;
}
.dropdown-menu a:hover{background:rgba(30,111,255,0.16);color:#00d4ff;padding-left:22px;}

/* 头部搜索按钮 */
.header-search-btn{
  display:flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:10px;
  border:1px solid rgba(255,255,255,0.14);
  color:rgba(255,255,255,0.85);cursor:pointer;
  transition:all .25s;margin-right:10px;background:transparent;
}
.header-search-btn:hover{
  border-color:#1e6fff;color:#00d4ff;
  background:rgba(30,111,255,0.12);transform:translateY(-1px);
}
@media (max-width: 768px){
  .header-search-btn{margin-right:6px;}
}

/* 移动端header细节 */
@media(max-width:768px){.header-inner{padding:0 14px}.logo-name{font-size:1.05rem}.mobile-toggle{width:38px;height:38px}}
@media(max-width:480px){.logo-sub{display:none}.header-search-btn{margin-right:4px}}


/* 下拉菜单激活态：下拉链接无nav-link类，用.on单独高亮 */
.dropdown-menu a.on{color:var(--accent);background:rgba(0,212,255,0.08)}
.dropdown-menu a.on:hover{color:var(--accent)}