:root {
    /* 核心色彩 */
    --primary-color: #1a3a5c;
    --secondary-color: #b28856; /* 金色/驼色 */
    --accent-color: #1677ff;
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    
    /* 文字颜色 */
    --text-main: #2d3a4b;
    --text-sub: #606f7b;
    --text-light: #94a3b8;
    
    /* 边框与阴影 */
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.08);
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
    transition: all 0.2s;
}

/* 全局布局容器 */
.inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- 公共头部样式 --- */
.site-common-header {
    height: 72px;
    background: #fff;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.site-common-header .inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.site-common-header .brand {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
}

.site-common-header .nav {
    display: flex;
    gap: 32px;
    height: 100%;
}

.site-common-header .nav a {
    color: var(--text-sub);
    font-size: 15px;
    font-weight: 500;
    display: flex;
    align-items: center;
    position: relative;
    height: 100%;
}

.site-common-header .nav a:hover {
    color: var(--primary-color);
}

.site-common-header .nav a.is-active {
    color: var(--primary-color);
    font-weight: 700;
}

.site-common-header .nav a.is-active::after {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--secondary-color);
    border-radius: 2px 2px 0 0;
}

/* --- 公共页脚样式 --- */
.site-common-footer {
    background: var(--primary-color);
    color: #cbd5e0;
    padding: 60px 0 40px;
    margin-top: 60px;
}

.site-common-footer .inner {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 60px;
}

.site-common-footer .footer-brand {
    font-size: 24px;
    color: #fff;
    font-weight: 700;
    margin-bottom: 20px;
}

.site-common-footer .footer-desc {
    font-size: 14px;
    line-height: 1.8;
    opacity: 0.8;
}

.site-common-footer .meta {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.site-common-footer .meta div {
    font-size: 14px;
}

.site-common-footer .copyright {
    grid-column: span 2;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 12px;
    opacity: 0.6;
}

.site-common-footer a {
    color: #fff;
}

/* --- 通用页面 Banner 样式 --- */
.page-hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #005c7a 100%);
    padding: 80px 20px;
    color: #fff;
    text-align: center;
}

.page-hero h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.page-hero p {
    font-size: 16px;
    opacity: 0.85;
    max-width: 600px;
    margin: 0 auto;
}

/* --- 响应式适配 --- */
@media (max-width: 768px) {
    .site-common-header .nav { display: none; } /* 移动端可隐藏或改为汉堡菜单 */
    .site-common-footer .inner { grid-template-columns: 1fr; gap: 30px; }
    .page-hero { padding: 60px 20px; }
    .page-hero h1 { font-size: 28px; }
}