/* --- 导航栏 (Navigator) --- */
header {
    position: fixed;
    top: 0;
    width: 100%;
    height: 60px;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    height: 100%;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
}

.logo-area > img {
    height: 28px;
}

.nav-links { display: flex; align-items: center; height: 100%; }
.nav-item { margin-left: 40px; position: relative; }
.nav-item > a {
    color: #d0d0d0;
    font-size: 14px;
    font-weight: 400;
    padding: 10px 0;
    display: block;
    transition: color 0.3s;
}
.nav-item > a:hover { color: #ffffff; }

.dropdown-menu {
    position: absolute;
    top: 100%; left: 50%;
    transform: translateX(-50%);
    background: #1c1c1e;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 6px;
    padding: 8px 0;
    width: 260px;
    display: none;
    flex-direction: column;
    box-shadow: 0 10px 20px rgba(0,0,0,0.5);
}
.nav-item:hover .dropdown-menu { display: flex; }
.dropdown-menu li a {
    display: block;
    padding: 10px 20px;
    color: #bbbbbb;
    font-size: 13px;
}
.dropdown-menu li a:hover { background: #333; color: #fff; }

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    width: 24px;
    height: 24px;
    position: relative;
    z-index: 1002;
    cursor: pointer;
    padding: 0;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: #fff;
    transition: all 0.3s ease;
    position: absolute;
    left: 0;
}

.mobile-menu-btn span:nth-child(1) { top: 4px; }
.mobile-menu-btn span:nth-child(2) { top: 11px; }
.mobile-menu-btn span:nth-child(3) { top: 18px; }

/* 移动端遮罩菜单 */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    z-index: 999;
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mobile-menu-overlay.active {
    display: block;
    opacity: 1;
}

.mobile-menu-content {
    width: 100%;
    padding: 80px 20px 20px;
    overflow-y: auto;
    position: relative;
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
}

.mobile-nav-item {
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.mobile-nav-item > a {
    display: block;
    padding: 18px 0;
    color: #d0d0d0;
    font-size: 18px;
    font-weight: 500;
}

.mobile-nav-item.has-dropdown > a {
    position: relative;
}

.mobile-nav-item.has-dropdown > a::after {
    content: '›';
    position: absolute;
    right: 0;
    transform: rotate(90deg);
    font-size: 20px;
    transition: transform 0.3s ease;
}

.mobile-nav-item.has-dropdown.active > a::after {
    transform: rotate(-90deg);
}

.mobile-dropdown-menu {
    /*max-height: 0;*/
    /*overflow: hidden;*/
    transition: max-height 0.3s ease;
    background: rgba(255,255,255,0.05);
    border-radius: 8px;
    margin: 0 0 10px 0;
}

/*.mobile-dropdown-menu.active {*/
/*    max-height: 300px;*/
/*    margin-bottom: 10px;*/
/*}*/

.mobile-dropdown-menu li a {
    display: block;
    padding: 14px 16px;
    color: #bbbbbb;
    font-size: 16px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.mobile-dropdown-menu li:last-child a {
    border-bottom: none;
}

.mobile-dropdown-menu li a:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
}

/* 菜单激活状态 */
.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg);
    top: 11px;
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg);
    top: 11px;
}

/* --- 响应式设计 --- */
@media (min-width: 901px) {
    .mobile-menu-btn,
    .mobile-menu-overlay {
        display: none !important;
    }
}

@media (max-width: 768px) {
    /* 隐藏桌面导航 */
    .nav-links {
        display: none;
    }

    /* 显示移动菜单按钮 */
    .mobile-menu-btn {
        display: block;
    }
}