/* 全局基础设置 */
body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: #ffffff;
    color: #171717;
    overflow-x: hidden;
}

/* 极简主义滚动条 */
::-webkit-scrollbar {
    width: 5px;
    height: 5px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background-color: #e5e5e5;
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background-color: #a3a3a3;
}

/* 文本选中样式 */
::selection {
    background-color: #f3f4f6;
    color: #000000;
}

/* 移动端优化 */
* {
    -webkit-tap-highlight-color: transparent;
}

/* 交互动画：链接底部跟随下划线 */
.hover-underline::after {
    content: '';
    display: block;
    width: 0;
    height: 1px;
    background: currentColor;
    transition: width 0.3s ease;
    margin-top: 2px;
}
.hover-underline:hover::after {
    width: 100%;
}

/* 视觉效果：图片加载淡入 */
.img-fade-in {
    animation: fadeIn 1s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    opacity: 0;
}

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

/* 视觉效果：平滑过渡 */
.smooth-transition {
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}