/* 導航欄樣式 */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.5rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: transparent;
    mix-blend-mode: difference;
    transition: all 0.3s ease;
}

.nav.scrolled {
    background: rgba(0,0,0,0.9);
    padding: 1rem 2rem;
    backdrop-filter: blur(10px);
}

.logo {
    height: 55px;
    width: auto;
    transition: filter 0.3s ease;
    filter: brightness(1.2);
    display: block;
}

.nav.scrolled .logo {
    height: 45px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: #ffffff;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 300;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background: #00E5FF;
    transition: width 0.3s ease;
}

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

/* 響應式設計 */
@media (max-width: 992px) {
    .nav {
        padding: 1rem 2rem;
    }
    
    .nav.scrolled {
        padding: 0.8rem 1.5rem;
    }
    
    .logo {
        height: 45px;
    }
    
    .nav.scrolled .logo {
        height: 40px;
    }
}

@media (max-width: 576px) {
    .nav {
        padding: 1rem;
    }
    
    .nav.scrolled {
        padding: 0.8rem 1rem;
    }
    
    .logo {
        height: 40px;
    }
    
    .nav.scrolled .logo {
        height: 35px;
    }
    
    .nav-links {
        gap: 1.5rem;
    }
    
    .nav-link {
        font-size: 0.9rem;
    }
}

/* iPhone 适配 */
@media (max-width: 428px) {
    .nav {
        padding: 0.8rem;
        padding-top: env(safe-area-inset-top, 0.8rem);
    }
    
    .nav-links {
        gap: 1.2rem;
    }
    
    .logo {
        height: 35px;
    }
}

/* 触摸设备特殊处理 */
@media (hover: none) {
    .nav-link:hover::after {
        width: 0;
    }
    
    .nav-link:active::after {
        width: 100%;
    }
}