/* 全局基础样式 - 通用样式（可被多个页面复用） */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", "Helvetica Neue", sans-serif;
}
body {
    background-color: #ffffff;
    color: #333333;
    line-height: 1.6;
    scroll-behavior: smooth;
    overflow-x: hidden;
}
a {
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
}
/* 核心宽度调整：自适应+合理边距 */
.container {
    width: 90%; /* 自适应宽度（占屏幕90%） */
    max-width: 1400px; /* 大屏最大宽度1400px（原1200px） */
    margin: 0 auto;
    padding: 0 20px; /* 统一内边距 */
}
/* 加载动画 */
.loader {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.9);
    z-index: 9999;
    justify-content: center;
    align-items: center;
}
.loader-spinner {
    width: 60px;
    height: 60px;
    border: 6px solid #f0f5ff;
    border-top: 6px solid #005A9C;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: #005A9C;
    color: #fff;
    border-radius: 50%;
    display: none;
    justify-content: center;
    align-items: center;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,90,156,0.3);
    z-index: 999;
    transition: all 0.3s ease;
}
.back-to-top:hover {
    background-color: #165DFF;
    transform: translateY(-3px);
}