.login-area {
    position: fixed;
    top: 30px;
    right: 30px;
    z-index: 100;
    animation: fadeInDown 0.8s ease;
}

.login-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.8) 100%);
    border: 2px solid rgba(78,205,196,0.3);
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    color: #333;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    background: linear-gradient(135deg, #4ECDC4 0%, #44A08D 100%);
    color: white;
    border-color: #4ECDC4;
}

/* 用户信息区域样式 */
.user-info {
    position: fixed;
    top: 30px;
    right: 30px;
    z-index: 100;
    animation: fadeInDown 0.8s ease;
    display: none;
}

.user-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    background: linear-gradient(135deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.9) 100%);
    border: 2px solid rgba(78,205,196,0.3);
    border-radius: 25px;
    backdrop-filter: blur(10px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    cursor: pointer;
    transition: all 0.3s ease;
}

.user-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4ECDC4 0%, #44A08D 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: white;
}

.user-details {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.user-name {
    font-size: 1rem;
    font-weight: 600;
    color: #333;
}

.user-grade {
    font-size: 0.85rem;
    color: #666;
}

/* 用户菜单下拉 */
.user-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: linear-gradient(135deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.9) 100%);
    border: 2px solid rgba(78,205,196,0.3);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    min-width: 180px;
    display: none;
    animation: slideInDown 0.3s ease;
}

.user-menu.show {
    display: block;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.menu-item:last-child {
    border-bottom: none;
}

.menu-item:hover {
    background: rgba(78,205,196,0.1);
}

.menu-item:first-child {
    border-radius: 13px 13px 0 0;
}

.menu-item:last-child {
    border-radius: 0 0 13px 13px;
}

.login-icon {
    font-size: 1.2rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .login-area, .user-info {
        top: 20px;
        right: 20px;
    }

    .login-btn {
        padding: 10px 18px;
        font-size: 0.9rem;
    }

    .user-card {
        padding: 10px 16px;
    }

    .user-name {
        font-size: 0.9rem;
    }

    .user-grade {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .login-area, .user-info {
        top: 15px;
        right: 15px;
    }

    .login-btn {
        padding: 8px 15px;
        font-size: 0.85rem;
    }

    .login-icon {
        font-size: 1rem;
    }

    .user-card {
        padding: 8px 14px;
    }

    .user-avatar {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }

    .user-name {
        font-size: 0.85rem;
    }

    .user-grade {
        font-size: 0.75rem;
    }

    .user-menu {
        min-width: 160px;
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}