/* ==================== 基础样式（超大屏幕 > 1920px）==================== */
.menu-header-nav {
    position: relative;
    height: 70px;
    overflow: hidden;
}

.menu-toggle {
    display: none;
}

.menu-overlay {
    display: none;
}

.menu-nav-primary {
    cursor: pointer;
    display: flex;
    align-items: center;
    height: 100%;
    margin: 0;
    padding: 0;
    list-style: none;
    white-space: nowrap;
    overflow: visible;
    flex-wrap: nowrap;
    width: 100%;
}

.menu-nav-primary li {
    flex: 0 1 auto;
    line-height: 70px;
    position: relative;
    color: var(--text-dark);
    font-size: 18px;
    padding: 0 30px;
    display: flex;
    align-items: center;
    box-sizing: border-box;
    height: 100%;
    transition: var(--transition);
    white-space: nowrap;
}



.menu-nav-primary > li:first-child {
    margin-left: 50px;
}

.menu-nav-primary li a {
    height: 100%;
    display: block;
    line-height: 70px;
    color: var(--text-dark);
    font-size: inherit;
    white-space: nowrap;
    text-decoration: none;
}

.menu-nav-primary li a:hover {
    color: var(--primary-yellow);
}

.menu-nav-primary li.active > a {
    color: var(--primary-yellow);
}

.menu-nav-primary li a:after {
    content: '';
    position: absolute;
    width: 0;
    height: 3px;
    bottom: 0;
    left: 0;
    background-color: var(--primary-yellow);
    transition: width 0.3s ease;
    border-radius: 3px;
}

.menu-nav-primary .menu-dropdown-inner {
    position: absolute;
    left: 0;
    top: 70px;
    width: 100%;
    min-width: 200px;
    background-color: #40B4F7;
    transition: all .4s;
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    list-style: none;
    padding: 0;
    margin: 0;
    box-shadow: 0 6px 20px rgba(64, 180, 247, 0.4);
    border-top: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 0 0 10px 10px;
}

.menu-nav-primary .menu-dropdown-inner li {
    margin: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    width: 100%;
    flex-direction: column;
    float: none;
    line-height: 50px;
    height: auto;
    padding: 0;
    flex: none;
}

.menu-nav-primary .menu-dropdown-inner li a {
    line-height: 50px;
    font-size: 16px;
    padding: 0 25px;
    color: #fff;
}

.menu-item-has-children:hover > .menu-dropdown-inner {
    opacity: 1;
    visibility: visible;
}

/* ==================== 阶梯式收缩（1920px → 1024px）==================== */

@media screen and (max-width: 1920px) and (min-width: 1681px) {
    .menu-header-nav { height: 68px; }
    .menu-nav-primary li {
        padding: 0 28px;
        font-size: 17.5px;
        line-height: 68px;
    }
    .menu-nav-primary > li:first-child { margin-left: 45px; }
    .menu-nav-primary li a { line-height: 68px; }
    .menu-nav-primary .menu-dropdown-inner {
        top: 68px;
        min-width: 195px;
    }
    .menu-nav-primary .menu-dropdown-inner li { line-height: 48px; }
    .menu-nav-primary .menu-dropdown-inner li a { line-height: 48px; font-size: 15.5px; }
}

@media screen and (max-width: 1680px) and (min-width: 1441px) {
    .menu-header-nav { height: 66px; }
    .menu-nav-primary li {
        padding: 0 26px;
        font-size: 17px;
        line-height: 66px;
    }
    .menu-nav-primary > li:first-child { margin-left: 40px; }
    .menu-nav-primary li a { line-height: 66px; }
    .menu-nav-primary .menu-dropdown-inner {
        top: 66px;
        min-width: 190px;
    }
    .menu-nav-primary .menu-dropdown-inner li { line-height: 46px; }
    .menu-nav-primary .menu-dropdown-inner li a { line-height: 46px; font-size: 15px; }
}

@media screen and (max-width: 1440px) and (min-width: 1367px) {
    .menu-header-nav { height: 64px; }
    .menu-nav-primary li {
        padding: 0 24px;
        font-size: 16.5px;
        line-height: 64px;
    }
    .menu-nav-primary > li:first-child { margin-left: 35px; }
    .menu-nav-primary li a { line-height: 64px; }
    .menu-nav-primary .menu-dropdown-inner {
        top: 64px;
        min-width: 185px;
    }
    .menu-nav-primary .menu-dropdown-inner li { line-height: 44px; }
    .menu-nav-primary .menu-dropdown-inner li a { line-height: 44px; font-size: 14.5px; }
}

@media screen and (max-width: 1366px) and (min-width: 1281px) {
    .menu-header-nav { height: 62px; }
    .menu-nav-primary li {
        padding: 0 22px;
        font-size: 16px;
        line-height: 62px;
    }
    .menu-nav-primary > li:first-child { margin-left: 32px; }
    .menu-nav-primary li a { line-height: 62px; }
    .menu-nav-primary .menu-dropdown-inner {
        top: 62px;
        min-width: 180px;
    }
    .menu-nav-primary .menu-dropdown-inner li { line-height: 42px; }
    .menu-nav-primary .menu-dropdown-inner li a { line-height: 42px; font-size: 14px; }
}

@media screen and (max-width: 1280px) and (min-width: 1201px) {
    .menu-header-nav { height: 60px; }
    .menu-nav-primary li {
        padding: 0 20px;
        font-size: 15.5px;
        line-height: 60px;
    }
    .menu-nav-primary > li:first-child { margin-left: 28px; }
    .menu-nav-primary li a { line-height: 60px; }
    .menu-nav-primary .menu-dropdown-inner {
        top: 60px;
        min-width: 175px;
    }
    .menu-nav-primary .menu-dropdown-inner li { line-height: 40px; }
    .menu-nav-primary .menu-dropdown-inner li a { line-height: 40px; font-size: 14px; }
}

@media screen and (max-width: 1200px) and (min-width: 1151px) {
    .menu-header-nav { height: 60px; }
    .menu-nav-primary li {
        padding: 0 18px;
        font-size: 15px;
        line-height: 60px;
    }
    .menu-nav-primary > li:first-child { margin-left: 25px; }
    .menu-nav-primary li a { line-height: 60px; }
    .menu-nav-primary .menu-dropdown-inner { top: 60px; }
}

@media screen and (max-width: 1150px) and (min-width: 1101px) {
    .menu-header-nav { height: 58px; }
    .menu-nav-primary li {
        padding: 0 16px;
        font-size: 14.5px;
        line-height: 58px;
    }
    .menu-nav-primary > li:first-child { margin-left: 22px; }
    .menu-nav-primary li a { line-height: 58px; }
    .menu-nav-primary .menu-dropdown-inner {
        top: 58px;
        min-width: 170px;
    }
    .menu-nav-primary .menu-dropdown-inner li { line-height: 40px; }
    .menu-nav-primary .menu-dropdown-inner li a { line-height: 40px; }
}

@media screen and (max-width: 1100px) and (min-width: 1051px) {
    .menu-header-nav { height: 56px; }
    .menu-nav-primary li {
        padding: 0 14px;
        font-size: 14px;
        line-height: 56px;
    }
    .menu-nav-primary > li:first-child { margin-left: 18px; }
    .menu-nav-primary li a { line-height: 56px; }
    .menu-nav-primary .menu-dropdown-inner {
        top: 56px;
        min-width: 165px;
    }
    .menu-nav-primary .menu-dropdown-inner li { line-height: 38px; }
    .menu-nav-primary .menu-dropdown-inner li a {
        line-height: 38px;
        font-size: 13px;
    }
}

@media screen and (max-width: 1050px) and (min-width: 1025px) {
    .menu-header-nav { height: 54px; }
    .menu-nav-primary li {
        padding: 0 12px;
        font-size: 13px;
        line-height: 54px;
    }
    .menu-nav-primary > li:first-child { margin-left: 15px; }
    .menu-nav-primary li a { line-height: 54px; }
    .menu-nav-primary .menu-dropdown-inner {
        top: 54px;
        min-width: 160px;
        box-shadow: 0 3px 10px rgba(64, 180, 247, 0.3);
    }
    .menu-nav-primary .menu-dropdown-inner li { line-height: 36px; }
    .menu-nav-primary .menu-dropdown-inner li a {
        line-height: 36px;
        font-size: 12px;
        padding: 0 15px;
    }
}

/* ==================== 响应式：平板和手机 (1024px 以下) ==================== */
@media screen and (max-width: 1024px) {
    .menu-header-nav {
        height: 56px;
    }

    /* 汉堡菜单按钮 - 优化后：右侧垂直居中 */
    .menu-toggle {
        display: block;
        position: absolute;
        top: 50%;
        right: 20px;
        transform: translateY(-50%);
        width: 30px;
        height: 24px;
        cursor: pointer;
        z-index: 1001;
        padding: 0;              /* 移除padding避免定位偏移 */
        border: none;            /* 移除边框 */
        background: transparent;
    }

    .menu-toggle:hover {
        background: rgba(240, 185, 11, 0.1);
    }

    .menu-toggle.active {
        background: rgba(240, 185, 11, 0.2);
    }

    .menu-toggle.hidden {
        display: none !important;
    }

    /* 汉堡图标线条 - 优化后：相对按钮居中 */
    .menu-toggle span {
        display: block;
        position: absolute;
        height: 3px;
        width: 100%;              /* 按钮宽度的100% */
        background: var(--text-dark);
        border-radius: 3px;
        opacity: 1;
        left: 0;                  /* 相对于按钮左侧 */
        transform: rotate(0deg);
        transition: .25s ease-in-out;
    }

    .menu-toggle span:nth-child(1) { top: 0; }
    .menu-toggle span:nth-child(2) { top: 10px; }
    .menu-toggle span:nth-child(3) { top: 20px; }

    /* 遮罩层 */
    .menu-overlay {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 998;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        backdrop-filter: blur(2px);
    }

    .menu-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    /* 侧边栏导航 */
    .menu-nav-primary {
        position: fixed;
        top: 0;
        right: -320px;
        width: 320px;
        height: 100vh;
        background-color: #fff;
        z-index: 999;
        transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
        padding-top: 80px;
        flex-direction: column;
        align-items: stretch;
        white-space: normal;
        box-shadow: -5px 0 25px rgba(0, 0, 0, 0.2);
    }

    .menu-nav-primary.active { right: 0; }

    .menu-nav-primary li {
        flex: none;
        line-height: 56px;
        padding: 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.2);
        flex-direction: row;
        height: auto;
        margin: 0;
        font-size: 16px;
    }

    .menu-nav-primary > li:first-child {
        margin-left: 0;
        border-top: 1px solid rgba(255, 255, 255, 0.2);
    }

    .menu-nav-primary li a {
        line-height: 56px;
        font-size: 16px;
        padding: 0 25px;
        flex: 1;
        color: var(--text-dark);
        font-weight: 500;
        text-decoration: none;
    }

    .menu-nav-primary li.active {
        background: var(--light-yellow);
        border-left: 4px solid var(--primary-yellow);
    }

    .menu-nav-primary li.active > a {
        color: var(--primary-yellow);
    }

    /* 下拉菜单 - 手风琴样式 */
    .menu-nav-primary .menu-dropdown-inner {
        position: static;
        opacity: 1;
        visibility: visible;
        display: none;
        background-color: var(--gray-bg);
        box-shadow: none;
        border-top: 1px solid rgba(0, 0, 0, 0.1);
        border-radius: 0;
        min-width: auto;
        top: auto;
        width: 100%;
    }

    .menu-nav-primary .menu-dropdown-inner.show {
        display: block;
        animation: slideDown 0.3s ease;
    }

    @keyframes slideDown {
        from { opacity: 0; transform: translateY(-10px); }
        to { opacity: 1; transform: translateY(0); }
    }

    .menu-nav-primary .menu-dropdown-inner li {
        border-top: 1px solid rgba(0, 0, 0, 0.1);
        padding-left: 20px;
        line-height: 48px;
    }

    .menu-nav-primary .menu-dropdown-inner li a {
        font-size: 14px;
        line-height: 48px;
    }

    .menu-item-has-children {
        position: relative;
    }

    .menu-item-has-children::after {
        content: '+';
        position: absolute;
        right: 20px;
        top: 0;
        line-height: 56px;
        color: var(--text-dark);
        font-size: 20px;
        transition: transform 0.3s;
        pointer-events: none;
    }

    .menu-item-has-children.mobile-active::after {
        content: '-';
    }
}

/* ==================== 手机设备 (768px 以下) ==================== */
@media screen and (max-width: 768px) {
    .menu-header-nav { height: 50px; }

    .menu-toggle {
        right: 15px;      /* 调整右侧距离 */
        width: 26px;
        height: 20px;
    }

    .menu-toggle span {
        height: 2.5px;
    }

    .menu-toggle span:nth-child(1) { top: 0; }
    .menu-toggle span:nth-child(2) { top: 8px; }
    .menu-toggle span:nth-child(3) { top: 16px; }

    .menu-nav-primary {
        width: 280px;
        right: -280px;
        padding-top: 70px;
    }

    .menu-nav-primary li { line-height: 52px; }
    .menu-nav-primary li a {
        line-height: 52px;
        font-size: 15px;
        padding: 0 20px;
    }
    .menu-nav-primary .menu-dropdown-inner li { line-height: 44px; }
    .menu-nav-primary .menu-dropdown-inner li a { line-height: 44px; }

    .menu-item-has-children::after {
        line-height: 52px;
    }
}

/* 小屏手机 */
@media screen and (max-width: 480px) {
    .menu-header-nav { height: 48px; }

    .menu-toggle {
        right: 15px;
        width: 24px;
        height: 18px;
    }

    .menu-toggle span {
        height: 2px;
    }

    .menu-toggle span:nth-child(1) { top: 0; }
    .menu-toggle span:nth-child(2) { top: 7px; }
    .menu-toggle span:nth-child(3) { top: 14px; }

    .menu-nav-primary {
        width: 260px;
        right: -260px;
        padding-top: 60px;
    }

    .menu-nav-primary li {
        line-height: 48px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    }

    .menu-nav-primary li a {
        line-height: 48px;
        font-size: 14px;
        padding: 0 20px;
    }

    .menu-nav-primary .menu-dropdown-inner li {
        padding-left: 15px;
        line-height: 40px;
    }

    .menu-nav-primary .menu-dropdown-inner li a {
        font-size: 13px;
        line-height: 40px;
    }

    .menu-item-has-children::after {
        line-height: 48px;
        right: 15px;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .menu-nav-primary li:hover { background: transparent; }
    .menu-nav-primary li:active { background: var(--light-yellow); }
}