/* Navigation - Minimalist (Desktop Optimized) */
.site-header {
    padding: 2rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 99999;
    background-color: transparent;
    transition: background-color 0.3s ease, padding 0.3s ease;
    overflow: visible !important;
}

/* Scrolled State */
.site-header.scrolled {
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.9) 0%, rgba(30, 41, 59, 0.9) 100%);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1rem 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-container {
    display: flex;
    /* 核心修改：改为两端布局（或左中布局），防止重叠 */
    justify-content: space-between;
    align-items: center;
    max-width: 1920px;
    margin: 0 auto;
    padding: 0 40px;
    width: 100%;
    height: 100%;
    box-sizing: border-box;
    /* 确保 padding 不会撑大宽度 */
}

/* Logo 样式修复 */
.logo {
    /* 核心修改：移除 absolute，让 Logo 回到文档流中 */
    position: static;
    /* left: 40px;  <-- 删除这行 */
    /* top: 50%;    <-- 删除这行 */
    transform: none;
    z-index: 10;
    flex-shrink: 0;
    /* 禁止 Logo 被压缩 */
    margin-right: 40px;
    /* 给右侧导航留出安全距离 */
}

.main-nav {
    position: relative;
    z-index: 5;
    /* 让导航在剩余空间中居中 (如果希望严格居中，需改用 Grid，但 Flex 更稳健) */
    flex-grow: 1;
    display: flex;
    justify-content: center;
    /* 让菜单项在导航区域内居中 */
}


.logo a {
    font-family: 'Playfair Display', serif;
    font-size: 2.6rem;
    font-weight: 700;
    color: white;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-decoration: none;
    white-space: nowrap;
    /* 防止 Logo 换行 */
}

.main-nav ul {
    display: flex;
    gap: 3rem;
    /* 默认间距减小，更安全 */
    list-style: none;
    margin: 0;
    padding: 0;
}


.main-nav a {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.3rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: all 0.3s ease;
    text-decoration: none;
    white-space: nowrap;
    /* 核心修改：防止菜单文字换行 */
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1.5px;
    background: white;
    transition: width 0.3s ease;
    opacity: 0.8;
}

.main-nav a:hover {
    color: white;
}

.main-nav a:hover::after,
.main-nav li.active a::after {
    width: 100%;
}

/* Dropdown Navigation */
.main-nav li {
    position: relative;
    padding-bottom: 20px;
    margin-bottom: -20px;
}

.main-nav li ul {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 12px 0;
    border-radius: 6px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.08);
    min-width: 180px;
    flex-direction: column;
    gap: 0;
}

.main-nav li:hover ul,
.main-nav li.active ul {
    display: flex;
}

.main-nav li ul a {
    display: block;
    padding: 10px 24px;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.8);
    text-transform: none;
    letter-spacing: 0.5px;
    white-space: nowrap;
    text-align: left;
}

.main-nav li ul a::after {
    display: none;
}

.main-nav li ul a:hover {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
    padding-left: 28px;
}

/* Mobile Only Utility */
.mobile-only,
.mobile-navbar {
    display: none !important;
}