/* ========== 汽车资讯头部 暖灰 #868B8E / 灰蓝 #8290AB ========== */
:root {
    --auto-gray: #868B8E;
    --auto-blue: #8290AB;
    --auto-blue-dark: #5a6a7e;
    --auto-bg: #ffffff;
    --auto-text: #2e2b28;
    --auto-text-light: #5e554a;
    --auto-border: #e0e0e0;
    --auto-shadow: 0 4px 16px rgba(0,0,0,0.06);
    --auto-radius: 8px;
    --auto-transition: 0.2s ease;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* 头部主栏 */
.auto-header__bar {
    background: #fff;
    border-bottom: 1px solid #eee;
    padding: 16px 0;
}
.auto-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

/* Logo */
.auto-logo img {
    height: 45px;
    width: auto;
    display: block;
}

/* 汉堡按钮 */
.auto-burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: 1px solid var(--auto-border);
    border-radius: 4px;
    padding: 8px;
    cursor: pointer;
}
.auto-burger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--auto-text);
    border-radius: 2px;
}

/* 搜索框 */
.auto-search__form {
    display: flex;
    align-items: center;
    background: #f5f5f5;
    border: 1px solid var(--auto-border);
    border-radius: 30px;
    padding: 5px 15px;
    transition: border-color var(--auto-transition);
}
.auto-search__form:focus-within {
    border-color: var(--auto-blue);
}
.auto-search__input {
    width: 200px;
    height: 32px;
    border: none;
    outline: none;
    background: transparent;
    font-size: 14px;
    color: var(--auto-text);
}
.auto-search__input::placeholder {
    color: #aaa;
}
.auto-search__btn {
    background: none;
    border: none;
    color: var(--auto-gray);
    cursor: pointer;
    font-size: 16px;
    transition: color var(--auto-transition);
}
.auto-search__btn:hover {
    color: var(--auto-blue);
}

/* 导航栏 */
.auto-nav {
    background: var(--auto-bg);
    border-bottom: 2px solid var(--auto-blue);
}
.auto-nav__list {
    list-style: none;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    margin: 0;
    padding: 0;
    gap: 4px;
}
.auto-nav__item {
    position: relative;
}
.auto-nav__item a {
    display: block;
    padding: 14px 22px;
    color: var(--auto-text);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color var(--auto-transition), background var(--auto-transition);
    border-radius: 6px;
}
.auto-nav__item a:hover {
    color: var(--auto-blue);
    background: rgba(130,144,171,0.08);
}
.auto-nav__item--active > a {
    color: var(--auto-blue);
    font-weight: 600;
    background: rgba(130,144,171,0.1);
}

/* 下拉菜单 */
.auto-nav__submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    border: 1px solid var(--auto-border);
    border-radius: var(--auto-radius);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    min-width: 150px;
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all var(--auto-transition);
    z-index: 200;
    list-style: none;
}
.auto-nav__item:hover .auto-nav__submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.auto-nav__submenu li a {
    padding: 10px 20px;
    font-size: 14px;
    white-space: nowrap;
    border-radius: 0;
}
.auto-nav__submenu li a:hover {
    background: var(--auto-blue);
    color: #fff;
}

/* 移动端适配 */
@media (max-width: 992px) {
    .auto-burger {
        display: flex;
    }
    .auto-search {
        display: none; /* 移动端可隐藏搜索，或改为图标 */
    }
    .auto-nav {
        display: none;
    }
    .auto-nav--open {
        display: block;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #fff;
        border-top: 1px solid #eee;
        box-shadow: 0 10px 20px rgba(0,0,0,0.06);
    }
    .auto-nav__list {
        flex-direction: column;
        gap: 0;
        padding: 10px 0;
    }
    .auto-nav__item a {
        border-radius: 0;
        padding: 14px 24px;
    }
    .auto-nav__submenu {
        position: static;
        box-shadow: none;
        border: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        display: none;
        padding-left: 20px;
    }
    .auto-nav__item:hover .auto-nav__submenu {
        display: block;
    }
}