/* 自定义动画和样式 */
@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* 作品集按钮初始隐藏状态 */
#portfolio .text-center.mt-16 {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

@keyframes scroll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

.animate-scroll {
    animation: scroll 30s linear infinite;
    will-change: transform;
    transform: translateZ(0);
}

/* 移动端品牌布局动画 */
@keyframes scroll-mobile {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

.animate-scroll-mobile-1 {
    animation: scroll-mobile 25s linear infinite;
    will-change: transform;
    transform: translateZ(0);
}

.animate-scroll-mobile-2 {
    animation: scroll-mobile 30s linear infinite;
    animation-delay: -10s;
    will-change: transform;
    transform: translateZ(0);
}

.animate-scroll-mobile-3 {
    animation: scroll-mobile 35s linear infinite;
    animation-delay: -20s;
    will-change: transform;
    transform: translateZ(0);
}

/* 响应式品牌布局容器 */
.brand-partners-desktop {
    /* 桌面端单行布局 - 保持现有样式 */
}

/* 只在桌面端显示品牌布局容器 */
@media (min-width: 768px) {
    .brand-partners-desktop {
        display: flex;
    }
}


/* 移动端品牌图标尺寸和布局优化 */
@media (max-width: 767px) {
    .brand-partners-mobile {
        /* 移动端3行布局 */
        flex-direction: column;
        gap: 1rem;
        display: flex;
    }
    
    .brand-partners-mobile .flex {
        /* 确保每行的品牌图标容器能够无缝滚动 */
        width: max-content;
        /* 移动端动画性能优化 */
        will-change: transform;
        backface-visibility: hidden;
        perspective: 1000px;
    }

    .brand-partners-mobile .w-16 {
        width: 3rem;
        height: 3rem;
    }

    .brand-partners-mobile .md\\:w-20 {
        width: 3.5rem;
        height: 3.5rem;
    }

    .brand-partners-mobile .space-x-6 > :not([hidden]) ~ :not([hidden]) {
        margin-inline-start: 1.5rem;
    }

    /* 移动端性能优化 */
    .brand-partners-mobile .avatar {
        will-change: transform;
        backface-visibility: hidden;
        perspective: 1000px;
    }

    .brand-partners-mobile .avatar img {
        will-change: transform, opacity;
        backface-visibility: hidden;
        transform: translateZ(0);
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* 模态框样式 */
.modal-open {
    overflow: hidden;
}

/* 按钮样式统一 */
.btn-primary,
.btn-secondary,
.btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border-radius: 0.75rem;
    font-weight: 600;
    font-size: 1.125rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    text-decoration: none;
    border: none;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    min-width: fit-content;
}

/* 主要按钮 - 红色渐变背景 */
.btn-primary {
    background: linear-gradient(135deg, #DC2626 0%, #B91C1C 50%, #991B1B 100%);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(220, 38, 38, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 25px rgba(220, 38, 38, 0.5);
    background: linear-gradient(135deg, #B91C1C 0%, #DC2626 50%, #EF4444 100%);
}

.btn-primary:active {
    transform: translateY(-1px) scale(1.02);
}

/* 大号按钮 */
.btn-primary.btn-lg,
.btn-secondary.btn-lg,
.btn-ghost.btn-lg {
    padding: 1.25rem 3rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.btn-primary.btn-lg {
    box-shadow: 0 6px 20px rgba(220, 38, 38, 0.4);
}

.btn-primary.btn-lg:hover {
    box-shadow: 0 12px 35px rgba(220, 38, 38, 0.6);
}

/* 次要按钮 - 透明背景，白色边框 */
.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(15px);
}

.btn-secondary:active {
    transform: translateY(-1px) scale(1.02);
    background: rgba(255, 255, 255, 0.15);
}

/* 幽灵按钮 - 纯文字 */
.btn-ghost {
    background: transparent;
    color: rgba(255, 255, 255, 0.9);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

.btn-ghost:hover {
    color: white;
    background: rgba(255, 255, 255, 0.05);
    transform: translateY(-1px);
}

/* 按钮图标动画 */
.btn-primary svg,
.btn-secondary svg,
.btn-ghost svg {
    transition: all 0.3s ease;
}

.btn-primary:hover svg:first-child {
    transform: translateX(-2px);
}

.btn-primary:hover svg:last-child {
    transform: translateX(2px);
}

.btn-secondary:hover svg {
    transform: scale(1.1);
}

/* 按钮发光效果 */
.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

/* 按钮内的文字 */
.btn-primary span,
.btn-secondary span,
.btn-ghost span {
    position: relative;
    z-index: 1;
}

/* 联系卡片增强效果 */
#contact .group {
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

#contact .group:hover {
    transform: translateY(-8px) scale(1.02);
}

#contact .group:hover .w-20 {
    box-shadow: 0 0 30px rgba(220, 38, 38, 0.3);
}

/* 发光边框动画 */
@keyframes glow {
    0% {
        box-shadow: 0 0 20px rgba(220, 38, 38, 0.2);
    }
    50% {
        box-shadow: 0 0 40px rgba(220, 38, 38, 0.4);
    }
    100% {
        box-shadow: 0 0 20px rgba(220, 38, 38, 0.2);
    }
}

#contact .group:hover .absolute.-inset-1 {
    animation: glow 2s ease-in-out infinite;
}

/* 渐变文字效果 */
@keyframes shimmer {
    0% {
        background-position: -200% center;
    }
    100% {
        background-position: 200% center;
    }
}

#contact h2 span {
    background-size: 200% auto;
    animation: shimmer 3s linear infinite;
}

/* 按钮响应式优化 */
@media (max-width: 768px) {
    .btn-primary,
    .btn-secondary,
    .btn-ghost {
        padding: 0.875rem 1.75rem;
        font-size: 1rem;
    }

    .btn-primary.btn-lg,
    .btn-secondary.btn-lg,
    .btn-ghost.btn-lg {
        padding: 1rem 2rem;
        font-size: 1.125rem;
    }

    .btn-primary svg,
    .btn-secondary svg,
    .btn-ghost svg {
        width: 1rem;
        height: 1rem;
    }

    .btn-primary.btn-lg svg,
    .btn-secondary.btn-lg svg,
    .btn-ghost.btn-lg svg {
        width: 1.125rem;
        height: 1.125rem;
    }

    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    #contact .text-5xl {
        font-size: 2.5rem;
    }

    #contact .md\:text-7xl {
        font-size: 3rem;
    }

    #contact .p-8 {
        padding: 1.5rem;
    }

    #contact .grid-cols-1 {
        gap: 1.5rem;
    }
}

@media (max-width: 640px) {
    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
        margin-bottom: 0.5rem;
    }

    .btn-primary.btn-lg,
    .btn-secondary.btn-lg {
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }

    #contact .text-5xl {
        font-size: 2rem;
    }

    #contact .md\:text-7xl {
        font-size: 2.5rem;
    }
}

/* 移动端按钮堆叠优化 */
@media (max-width: 768px) {
    .flex.flex-col.md\\:flex-row.gap-6.justify-center.items-center {
        gap: 1rem;
    }
}

/* 按钮聚焦状态 */
.btn-primary:focus,
.btn-secondary:focus,
.btn-ghost:focus {
    outline: 2px solid rgba(220, 38, 38, 0.5);
    outline-offset: 2px;
}

.btn-secondary:focus {
    outline-color: rgba(255, 255, 255, 0.5);
}

/* 禁用状态 */
.btn-primary:disabled,
.btn-secondary:disabled,
.btn-ghost:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary:disabled:hover,
.btn-secondary:disabled:hover,
.btn-ghost:disabled:hover {
    transform: none !important;
    box-shadow: none !important;
}

/* 自定义滚动条 - 红色主题色隐藏效果 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgb(220, 38, 38);  /* 不透明红色主题色 */
    border-radius: 4px;
    transition: background 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: rgb(185, 28, 28);  /* 悬停时更深的红色 */
}

/* 滚动条在非活动状态下隐藏 */
html {
    scrollbar-width: thin;
    scrollbar-color: rgb(220, 38, 38) transparent;
}

/* Firefox 滚动条样式 */
* {
    scrollbar-width: thin;
    scrollbar-color: rgb(220, 38, 38) transparent;
}

/* 选择文本样式 */
::selection {
    background-color: #ff0000;
    color: #ffffff;
}

::-moz-selection {
    background-color: #ff0000;
    color: #ffffff;
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 焦点样式 */
button:focus,
a:focus {
    outline: 2px solid #ff0000;
    outline-offset: 2px;
}

/* 加载动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* 移动端优化 */
@media (max-width: 640px) {
    .hero-content {
        padding-top: 2rem;
        padding-bottom: 2rem;
    }

    .text-6xl {
        font-size: 3rem;
        line-height: 1.1;
    }

    .text-8xl {
        font-size: 4rem;
        line-height: 1.1;
    }
}


/* 移动端菜单动画 */
.mobile-menu-link {
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.4s ease;
}

#mobile-menu-overlay:not(.opacity-0) .mobile-menu-link {
    transform: translateY(0);
    opacity: 1;
}

#mobile-menu-overlay:not(.opacity-0) .mobile-menu-link:nth-child(1) { transition-delay: 0.1s; }
#mobile-menu-overlay:not(.opacity-0) .mobile-menu-link:nth-child(2) { transition-delay: 0.2s; }
#mobile-menu-overlay:not(.opacity-0) .mobile-menu-link:nth-child(3) { transition-delay: 0.3s; }
#mobile-menu-overlay:not(.opacity-0) .mobile-menu-link:nth-child(4) { transition-delay: 0.4s; }
#mobile-menu-overlay:not(.opacity-0) .mobile-menu-link:nth-child(5) { transition-delay: 0.5s; }

/* 菜单项间距 */
#mobile-menu-overlay .mobile-menu-link {
    margin-bottom: 1.5rem;
}

/* 汉堡菜单按钮动画 */
#mobile-menu-btn {
    transition: all 0.3s ease;
}

#mobile-menu-btn:hover {
    transform: scale(1.1);
}

#mobile-menu-btn:active {
    transform: scale(0.95);
}

/* 关闭按钮样式 */
#mobile-menu-close-btn {
    position: fixed !important;
    top: 20px !important;
    right: 20px !important;
    z-index: 70 !important;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
}

#mobile-menu-close-btn:hover {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.2);
}

#mobile-menu-close-btn:active {
    transform: scale(0.95);
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .text-gray-400 {
        color: #ffffff;
    }

    .text-gray-300 {
        color: #ffffff;
    }
}

/* 减少动画偏好支持 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* 作品分类筛选样式 */
.portfolio-filter {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-weight: 500;
    letter-spacing: 0.025em;
}

.portfolio-filter:hover {
    border-color: rgba(220, 38, 38, 0.3);
    box-shadow: 0 10px 25px -5px rgba(220, 38, 38, 0.2);
}

.portfolio-filter.active {
    background: linear-gradient(135deg, #DC2626 0%, #B91C1C 50%, #991B1B 100%);
    border-color: rgba(220, 38, 38, 0.5);
    box-shadow: 0 10px 25px -5px rgba(220, 38, 38, 0.4);
}

/* 作品集网格容器动画 - 优化版本 */
#portfolio-grid {
    position: relative;
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                height 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                min-height 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
    perspective: 1000px;
    min-height: 200px; /* 防止容器完全塌陷 */
    will-change: height, transform;
}

#portfolio-grid.filtering {
    transform: scale(0.98) translateY(5px);
    opacity: 0.8;
    filter: blur(1px);
}

/* 简化的筛选状态指示器 */
#portfolio-grid.filtering::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: rgba(220, 38, 38, 0.03);
    border-radius: 1rem;
    z-index: 1;
    animation: pulse 0.6s ease-in-out;
    pointer-events: none;
}

@keyframes pulse {
    0% {
        opacity: 0;
        transform: scale(0.98);
    }
    50% {
        opacity: 0.6;
        transform: scale(1);
    }
    100% {
        opacity: 0;
        transform: scale(0.98);
    }
}

/* 移除复杂的加载指示器，简化用户体验 */

/* 作品卡片筛选动画 - 优化版本 */
.portfolio-item {
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                filter 0.3s ease-out;
    position: relative;
    will-change: opacity, transform, filter;
}

.portfolio-item.hiding {
    opacity: 0;
    transform: scale(0.8) translateY(20px);
    pointer-events: none;
    filter: blur(5px);
}

.portfolio-item.showing {
    opacity: 1;
    transform: scale(1) translateY(0);
    pointer-events: auto;
    filter: blur(0);
}

/* 新的淡出动画类 */
.portfolio-item.fade-out {
    opacity: 0;
    transform: scale(0.9) translateY(-15px);
    filter: blur(3px);
    pointer-events: none;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 新的淡入动画类 */
.portfolio-item.fade-in {
    opacity: 0;
    transform: scale(0.9) translateY(15px);
    filter: blur(2px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.portfolio-item.fade-in.showing {
    opacity: 1;
    transform: scale(1) translateY(0);
    filter: blur(0);
}

.portfolio-item.delay-1 { transition-delay: 0.05s; }
.portfolio-item.delay-2 { transition-delay: 0.1s; }
.portfolio-item.delay-3 { transition-delay: 0.15s; }
.portfolio-item.delay-4 { transition-delay: 0.2s; }
.portfolio-item.delay-5 { transition-delay: 0.25s; }
.portfolio-item.delay-6 { transition-delay: 0.3s; }
.portfolio-item.delay-7 { transition-delay: 0.35s; }
.portfolio-item.delay-8 { transition-delay: 0.4s; }
.portfolio-item.delay-9 { transition-delay: 0.45s; }

/* 作品卡片进入动画 */
.portfolio-item.showing {
    animation: slideInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes slideInUp {
    0% {
        opacity: 0;
        transform: scale(0.8) translateY(30px);
        filter: blur(10px);
    }
    50% {
        filter: blur(2px);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
        filter: blur(0);
    }
}

/* 分类筛选响应式优化 */
@media (max-width: 640px) {
    .portfolio-filter {
        font-size: 0.875rem;
        padding: 0.5rem 1rem;
    }
}

/* 分享按钮样式 */
#share-btn {
    position: relative;
    overflow: hidden;
}

#share-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

#share-btn:hover::before {
    left: 100%;
}

#share-btn:active {
    transform: scale(0.95);
}

/* 移动端分享按钮样式 */
#mobile-share-btn {
    position: relative;
    overflow: hidden;
}

#mobile-share-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

#mobile-share-btn:hover::before {
    left: 100%;
}

/* 分享弹窗样式 */
.share-modal-enter {
    animation: modalEnter 0.3s ease-out;
}

.share-modal-exit {
    animation: modalExit 0.3s ease-in;
}

@keyframes modalEnter {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes modalExit {
    from {
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0;
        transform: scale(0.9);
    }
}

/* 分享选项样式 */
.share-option {
    position: relative;
    overflow: hidden;
}

.share-option::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.3s;
}

.share-option:hover::before {
    left: 100%;
}

.share-option:active {
    transform: scale(0.95);
}

/* 通知样式 */
.notification-enter {
    animation: notificationSlideIn 0.3s ease-out;
}

.notification-exit {
    animation: notificationSlideOut 0.3s ease-in;
}

@keyframes notificationSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes notificationSlideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* 返回顶部悬浮按钮样式 */
#back-to-hero-btn {
    /* 简化的淡入淡出动画 */
    transition: opacity 0.3s ease, visibility 0.3s ease;
    /* 强制固定定位，避免受父元素transform影响 */
    position: fixed !important;
    bottom: 2rem !important;
    right: 2rem !important;
    /* z-index设置为55，低于移动菜单的60 */
    z-index: 55 !important;
}

#back-to-hero-btn.visible,
#back-to-hero-btn.opacity-100 {
    opacity: 1 !important;
    visibility: visible !important;
}

#back-to-hero-btn:hover {
    background-color: #E60000;
}

/* 工具提示样式 */
#back-to-hero-btn span {
    background: rgba(31, 41, 55, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* 响应式适配 */
@media (max-width: 768px) {
    #back-to-hero-btn {
        bottom: 1.5rem !important;
        right: 1.5rem !important;
        width: 3rem;
        height: 3rem;
        padding: 0.75rem;
    }

    #back-to-hero-btn svg {
        width: 1.25rem;
        height: 1.25rem;
    }

    #back-to-hero-btn span {
        display: none; /* 移动端隐藏工具提示 */
    }
}

@media (max-width: 640px) {
    #back-to-hero-btn {
        bottom: 1rem !important;
        right: 1rem !important;
        width: 2.75rem;
        height: 2.75rem;
        padding: 0.625rem;
    }

    #back-to-hero-btn svg {
        width: 1.125rem;
        height: 1.125rem;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    #back-to-hero-btn {
        background: #DC2626;
        border: 2px solid #ffffff;
    }

    #back-to-hero-btn span {
        background: #1f2937;
        border: 1px solid #ffffff;
    }
}

/* 减少动画偏好支持 */
@media (prefers-reduced-motion: reduce) {
    #back-to-hero-btn {
        transition: opacity 0.3s ease, visibility 0.3s ease;
    }
}

/* 额外的防护样式 - 确保按钮始终正确定位 */
#back-to-hero-btn {
    /* 确保按钮不会被其他元素覆盖 */
    pointer-events: auto !important;
    /* 确保按钮不会被意外隐藏 */
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
}

/* 确保按钮的工具提示也正确定位 */
#back-to-hero-btn span {
    position: absolute !important;
    right: 100% !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
}

/* 单个向下箭头指示器样式 */
.single-scroll-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: arrow-float 3s infinite ease-in-out;
}

.arrow-down {
    color: rgba(255, 255, 255, 0.8);
    transition: all 0.3s ease;
    width: 20px;
    height: 20px;
}

/* 改进的轻微浮动动画 */
@keyframes arrow-float {
    0%, 100% {
        opacity: 0.6;
        transform: translateY(0) scale(1);
    }
    25% {
        opacity: 0.8;
        transform: translateY(-3px) scale(1.02);
    }
    50% {
        opacity: 1;
        transform: translateY(-6px) scale(1.05);
    }
    75% {
        opacity: 0.8;
        transform: translateY(-3px) scale(1.02);
    }
}

/* 保留原有的arrow-bounce动画作为备选 */
@keyframes arrow-bounce {
    0%, 100% {
        opacity: 0.6;
        transform: translateY(0);
    }
    50% {
        opacity: 1;
        transform: translateY(8px);
    }
}

/* 响应式调整 */
@media (max-width: 768px) {
    .arrow-down {
        width: 18px;
        height: 18px;
    }
}