/* ========== 丹阳富雅装饰 - 头部风格 ========== */
:root {
    --deco-dark: #333333;
    --deco-gray: #999999;
    --deco-light-bg: #f9f9f9;
    --deco-gold: #c4a265;           /* 点缀金色，体现品质 */
    --deco-white: #ffffff;
    --deco-shadow: 0 2px 16px rgba(0,0,0,0.06);
    --deco-radius: 6px;
    --deco-transition: 0.2s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部整体 */
.site-header {
    background: var(--deco-white);
    border-bottom: 1px solid #eeeeee;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--deco-shadow);
}

/* Logo 区域 */
.site-header__top {
    padding: 24px 0 18px;
    text-align: center;
    background: linear-gradient(to bottom, #fff, var(--deco-light-bg));
}

.site-logo img {
    height: 48px;
    width: auto;
    display: block;
    margin: 0 auto;
}

/* 主导航栏 */
.main-nav {
    background: var(--deco-dark);
    border-top: 2px solid var(--deco-gold);
}

.main-nav__list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    list-style: none;
    margin: 0;
    padding: 0;
}

.main-nav__item {
    position: relative;
}

.main-nav__link {
    display: block;
    padding: 16px 28px;
    color: var(--deco-white);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    transition: background var(--deco-transition), color var(--deco-transition);
    white-space: nowrap;
}

.main-nav__link:hover {
    background: rgba(255,255,255,0.08);
    color: var(--deco-gold);
}

/* 当前激活状态 */
.main-nav__item.active .main-nav__link {
    color: var(--deco-gold);
    background: rgba(196,162,101,0.1);
    font-weight: 600;
}

.main-nav__item.active .main-nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--deco-gold);
    border-radius: 2px;
}

/* 下拉菜单 */
.main-nav__sub-list {
    position: absolute;
    top: 100%;
    left: 0;
    background: #222;
    border-radius: 0 0 var(--deco-radius) var(--deco-radius);
    box-shadow: 0 8px 20px rgba(0,0,0,0.25);
    min-width: 160px;
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all var(--deco-transition);
    z-index: 200;
    list-style: none;
}

.main-nav__item:hover .main-nav__sub-list {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.main-nav__sub-list li a {
    display: block;
    padding: 10px 20px;
    color: #ccc;
    font-size: 0.95rem;
    text-decoration: none;
    transition: background var(--deco-transition), color var(--deco-transition);
}

.main-nav__sub-list li a:hover {
    background: var(--deco-gold);
    color: #fff;
}

/* 移动端适配：简单换行隐藏子菜单，可后续添加汉堡按钮 */
@media (max-width: 768px) {
    .main-nav__list {
        justify-content: flex-start;
    }
    .main-nav__link {
        padding: 12px 16px;
        font-size: 0.9rem;
    }
    .main-nav__sub-list {
        position: static;
        box-shadow: none;
        background: #1a1a1a;
        border-radius: 0;
        opacity: 1;
        visibility: visible;
        transform: none;
        display: none;
    }
    .main-nav__item:hover .main-nav__sub-list {
        display: block;
    }
}