/* ===== Header 样式 ===== */
:root {
    --color-primary: #2d7a2d;
    --color-text-muted: #5a9a5a;
    --fs-xs: clamp(10px, 1.2vw, 12px);
    --fs-sm: clamp(12px, 1.5vw, 14px);
    --fs-lg: clamp(20px, 3vw, 24px);
    --space-xs: clamp(4px, 0.5vw, 8px);
    --space-md: clamp(12px, 1.5vw, 20px);
}

/* Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(200, 230, 201, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(15, 216, 80, 0.3);
    z-index: 100;
    padding: clamp(10px, 2vw, 15px) 0;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 clamp(12px, 3vw, 20px);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: 'ZCOOL KuaiLe', 'Space Grotesk', sans-serif;
    font-size: var(--fs-lg);
    font-weight: 700;
    color: #fff;
    text-decoration: none;
    white-space: nowrap;
    overflow: visible;
}

@media (max-width: 480px) {
    .logo {
        font-size: clamp(16px, 5vw, 20px);
    }
    
    .header-nav {
        gap: clamp(6px, 2vw, 12px);
    }
    
    .nav-link {
        padding: var(--space-xs) clamp(6px, 2vw, 12px);
        font-size: clamp(10px, 3vw, 12px);
    }
}

.header-nav { 
    display: flex; 
    gap: clamp(10px, 2vw, 30px); 
}

.nav-link {
    color: var(--color-text-muted);
    font-size: var(--fs-sm);
    text-decoration: none;
    padding: var(--space-xs) var(--space-md);
    border-radius: 25px;
    transition: all 0.3s;
}

.nav-link:hover, .nav-link.active {
    background: rgba(15, 216, 80, 0.1);
    color: var(--color-primary);
}