.cosmic-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 0.75rem 1.5rem;
    background: rgba(10, 10, 26, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 30px rgba(139, 92, 246, 0.1);
}

.cosmic-nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cosmic-nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--starlight, #e8e8ff);
}

.cosmic-nav-logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.5);
}

.cosmic-nav-logo-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.cosmic-nav-logo-text {
    font-family: 'ZCOOL XiaoWei', serif;
    font-size: 1.4rem;
    letter-spacing: 3px;
    background: linear-gradient(135deg, var(--starlight, #e8e8ff), var(--accent-cyan, #00d4ff));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cosmic-nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
    margin: 0;
    padding: 0;
}

.cosmic-nav-links a {
    color: var(--mystic-silver, #b8b8d0);
    text-decoration: none;
    font-size: 0.9rem;
    letter-spacing: 1px;
    transition: color 0.3s ease;
    position: relative;
}

.cosmic-nav-links a:hover {
    color: var(--starlight, #e8e8ff);
}

.cosmic-nav-dropdown {
    position: relative;
}

.cosmic-nav-dropdown-arrow {
    font-size: 0.6rem;
    margin-left: 4px;
    transition: transform 0.3s ease;
}

.cosmic-nav-dropdown:hover .cosmic-nav-dropdown-arrow {
    transform: rotate(180deg);
}

.cosmic-nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 110px;
    background: rgba(15, 15, 35, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: 12px;
    padding: 0.5rem 0;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    z-index: 1000;
    margin-top: 8px;
}

.cosmic-nav-dropdown-menu::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid rgba(139, 92, 246, 0.3);
}

.cosmic-nav-dropdown:hover .cosmic-nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
}

.cosmic-nav-dropdown-menu li {
    margin: 0;
}

.cosmic-nav-dropdown-menu a {
    display: block;
    padding: 0.75rem 1.25rem;
    font-size: 0.9rem;
    color: var(--mystic-silver, #b8b8d0);
    transition: all 0.2s ease;
}

.cosmic-nav-dropdown-menu a:hover {
    color: var(--starlight, #e8e8ff);
    background: rgba(139, 92, 246, 0.15);
}

.cosmic-nav-back-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0.5rem 1rem;
    background: rgba(139, 92, 246, 0.2);
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: 8px;
    color: var(--starlight, #e8e8ff);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.cosmic-nav-back-btn:hover {
    background: rgba(139, 92, 246, 0.3);
    border-color: var(--glow-purple, #8b5cf6);
}

.cosmic-nav-mobile-btn {
    display: none;
    background: none;
    border: none;
    color: var(--starlight, #e8e8ff);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.25rem;
}

@media (max-width: 768px) {
    .cosmic-nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(10, 10, 26, 0.98);
        flex-direction: column;
        padding: 1rem;
        gap: 1rem;
    }

    .cosmic-nav-links.active {
        display: flex;
    }

    .cosmic-nav-dropdown-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        background: transparent;
        border: none;
        box-shadow: none;
        padding-left: 1rem;
        margin-top: 0;
    }

    .cosmic-nav-dropdown-menu::before {
        display: none;
    }

    .cosmic-nav-dropdown-menu a {
        padding: 0.75rem 0;
        font-size: 0.85rem;
    }

    .cosmic-nav-mobile-btn {
        display: block;
    }
}