/* =========================================================
   AOSEN INTERNATIONAL LIMITED - Navigation Bar
   Shared across all pages (EN & ZH)
   ========================================================= */

/* ============ Top Navigation Bar ============ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.97);
    box-shadow: 0 2px 8px rgba(44, 95, 122, 0.08);
    height: 68px;
    display: flex;
    align-items: center;
}
.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}
/* Logo 主体：纯文字「AOSEN.」，已放大以占据原 badge + 文字的整体视觉高度。
   原 .logo-badge（AOS 圆形）与 .logo-hint（占位提示）均已移除。 */
.logo-name {
    font-size: 30px;
    font-weight: 800;
    color: var(--c-dark);
    letter-spacing: 1.5px;
    line-height: 1;
}
.logo-name span {
    color: var(--c-brand);
}

/* ============ Nav Links ============ */
.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
    list-style: none;
}
.nav-links a {
    font-size: 15px;
    font-weight: 600;
    color: var(--c-dark);
    padding: 6px 0;
    position: relative;
}
.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: var(--c-brand);
    transition: width 0.3s ease;
}
.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}
.nav-links a.active {
    color: var(--c-brand);
}

/* ============ Dropdown menu for Products ============ */
.nav-links li.dropdown {
    position: relative;
}
.nav-links .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--c-white);
    box-shadow: 0 8px 20px rgba(44, 95, 122, 0.15);
    border-radius: 10px;
    padding: 8px 0;
    min-width: 190px;
    list-style: none;
    z-index: 999;
}
.nav-links .dropdown:hover .dropdown-menu,
.nav-links .dropdown:focus-within .dropdown-menu {
    display: block;
}
.nav-links .dropdown-menu a {
    display: block;
    padding: 10px 18px;
    font-weight: 500;
    white-space: nowrap;
    border-radius: 6px;
}
.nav-links .dropdown-menu a::after {
    display: none;
}
.nav-links .dropdown-menu a:hover {
    background: var(--c-bg-light);
    color: var(--c-brand);
}

/* ============ Language switch buttons ============ */
.lang-switch {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    margin: 0 12px 0 auto;
}
.lang-switch a {
    padding: 4px 12px;
    border-radius: 20px;
    border: 1px solid var(--c-mid);
    color: var(--c-dark);
    transition: all 0.3s ease;
}
.lang-switch a:hover {
    border-color: var(--c-brand);
    color: var(--c-brand);
}
.lang-switch a.active {
    background: var(--c-brand);
    color: var(--c-white);
    border-color: var(--c-brand);
}
.lang-switch .divider {
    color: var(--c-mid);
}

/* ============ Hamburger menu ============ */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 6px;
}
.hamburger span {
    width: 26px;
    height: 3px;
    background: var(--c-dark);
    border-radius: 2px;
    transition: 0.3s;
}

/* ============ Responsive Navigation ============ */
@media (max-width: 768px) {
    .hamburger { display: flex; }
    .lang-switch { margin-left: auto; }
    .nav-links {
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--c-white);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        box-shadow: 0 8px 16px rgba(44, 95, 122, 0.1);
        display: none;
    }
    .nav-links.open { display: flex; }
    .nav-links .dropdown-menu {
        position: static;
        box-shadow: none;
        padding: 0 0 0 20px;
        min-width: 0;
    }
    .nav-links li.dropdown { width: 100%; }
    /* 移动端 logo 略收，避免与汉堡按钮 / 语言切换挤在一起 */
    .logo-name { font-size: 24px; letter-spacing: 1px; }
}