/* Header Styles - Modern Minimalist */
.header {
    background-color: rgba(255, 255, 255, 0.2); /* 默认顶部透明度 20% */
    backdrop-filter: blur(5px);
    border-bottom: 1px solid transparent; /* 顶部时隐藏边框 */
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: none; /* 顶部时无阴影 */
    transition: all 0.3s ease;
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    min-height: 80px; /* 减小高度，更紧凑 */
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-decoration: none; /* 确保 Logo 链接无下划线 */
}

.logo-image {
    height: 45px; /* 调整 Logo 大小 */
    width: auto;
    object-fit: contain;
}

/* 如果没有 Logo 图片，使用文字 Logo */
.logo-text-container {
    display: flex;
    flex-direction: column;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    letter-spacing: -0.5px;
}

.logo-tagline {
    font-family: var(--font-primary);
    font-size: 0.75rem;
    color: var(--color-secondary);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.navigation {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    gap: 2.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-list a {
    font-family: var(--font-primary);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-primary);
    text-decoration: none;
    position: relative;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
}

.nav-list a:hover {
    color: var(--color-accent);
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width 0.3s ease;
}

.nav-list a:hover::after {
    width: 100%;
}

/* Active State */
.nav-list a.active {
    color: var(--color-accent);
}

.nav-list a.active::after {
    width: 100%;
}

/* Responsive Design */
@media (max-width: 992px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .nav-list {
        gap: 1.5rem;
        flex-wrap: wrap;
        justify-content: center;
    }
}